2024-03-28T16:48:48Z
http://eprints.biblio.unitn.it/cgi/oai2
oai:eprints.biblio.unitn.it:377
2012-02-28T14:16:22Z
7374617475733D756E707562
7375626A656374733D51:5143:51433137342E31372E503237
7375626A656374733D51:5143:51433137342E32
74797065733D746563687265706F7274
Feynman path integrals for polynomially growing potentials
Albeverio, Sergio
Mazzucchi, Sonia
QC174.2 Schrodinger Equation
QC174.17.P27 Integrals, path
A general class of infinite dimensional oscillatory integrals with polynomially growing phase functions is studied. A representation formula of the Parseval type is proved, as well as a formula giving the integrals in terms of analytically continued absolutely convergent integrals. These results are applied to provide a rigorous Feynman path integral representation for the solution of the time dependent Schrödinger equation with a quartic anharmonial potential. The Borel summability of the asymptotic expansion of the solution in power series of the coupling constant is also proved.
2003
Departmental Technical Report
NonPeerReviewed
application/pdf
http://eprints.biblio.unitn.it/377/1/UTM638.pdf
Albeverio, Sergio and Mazzucchi, Sonia (2003) Feynman path integrals for polynomially growing potentials. UNSPECIFIED. (Unpublished)
http://eprints.biblio.unitn.it/377/
oai:eprints.biblio.unitn.it:378
2012-02-28T14:16:22Z
7374617475733D756E707562
7375626A656374733D51:5143:5143363631
74797065733D746563687265706F7274
Mixed finite element approximation of eddy current problems
Alonso Rodriguez, Ana
Hiptmair, Ralf
Valli, Alberto
QC661 Electromagnetic Theory
Finite element approximations of eddy current problems that are entirely based on the magnetic field H are haunted by the need to enforce the algebraic constraint curlH = 0 in non-conducting regions. As an alternative to techniques employing combinatorial Seifert (cutting) surfaces in order to introduce a scalar magnetic potential, we propose mixed multi-field formulations, which enforce the constraint in the variational formulation. In light of the fact that the computation of cutting surfaces is expensive, the mixed finite element approximation is a viable option despite the increased number of unknowns.
2003
Departmental Technical Report
NonPeerReviewed
application/pdf
http://eprints.biblio.unitn.it/378/1/UTM639.pdf
Alonso Rodriguez, Ana and Hiptmair, Ralf and Valli, Alberto (2003) Mixed finite element approximation of eddy current problems. UNSPECIFIED. (Unpublished)
http://eprints.biblio.unitn.it/378/
oai:eprints.biblio.unitn.it:379
2012-02-28T14:16:22Z
7374617475733D756E707562
7375626A656374733D51:5143:5143363631
7375626A656374733D51:5141:51413337342E37
7375626A656374733D51:5143:5143323230
74797065733D746865736973
Domain decomposition algorithms for transport and wave propagation equations
Gerardo Giorda, Luca
QC661 Electromagnetic Theory
QA374.7 Partial differential equations
QC220 Acoustics. Sound
Not available
2002-12
Thesis
NonPeerReviewed
application/pdf
http://eprints.biblio.unitn.it/379/1/TesiGerardo.pdf
Gerardo Giorda, Luca (2002) Domain decomposition algorithms for transport and wave propagation equations. UNSPECIFIED thesis, UNSPECIFIED.
http://eprints.biblio.unitn.it/379/
oai:eprints.biblio.unitn.it:415
2013-07-26T09:46:18Z
7374617475733D756E707562
7375626A656374733D51:5143:5143303230
74797065733D746563687265706F7274
Holography, SL(2,R) symmetry, Virasoro algebra and all that in Rindler spacetime
Moretti, Valter
Pinamonti, Nicola
QC020 Mathematical Physics
It is shown that it is possible to define quantum field theory of a massless scalar free field on the event horizon of a 2D-Rindler spacetime. Free quantum field theory on the horizon enjoys diffeomorfism invariance and turns out to be unitarily and algebraically equivalent to the analogous theory of a scalar field prapogating inside Rindler spacetime, nomatter the value of the mass of the field in the bulk. More precisely, there exist a unique transformation that realizes the bulk-boundary correspondence upon an appropriate choice for Fock representation spaces. Secondly, the found correspondence is a subcase of an analogous algebraic correspondence described by the injective homomorphisms of the abstract algebras of observables generated by abstract quantum free-field operators. These field operators are smeared with suitable test functions in the bulk and exact 1-forms on the horizon. In this sense the correspondence is independent from the chosen vacua. It is proven that, under that correspondence the 'hidden' SL(2,R) quantum symmetry found in a previous work gets a clear geometric meaning, it being associated with a group of diffeomorphisms of the horizon itself. Finally it is found that there is a possible enlargement of the quantum symmetry on the horizon to a quantum Virasoro symmetry associated with vector fields on the event horizon.
2003-04
Departmental Technical Report
NonPeerReviewed
application/pdf
http://eprints.biblio.unitn.it/415/1/UTM640.pdf
Moretti, Valter and Pinamonti, Nicola (2003) Holography, SL(2,R) symmetry, Virasoro algebra and all that in Rindler spacetime. UNSPECIFIED. (Unpublished)
http://eprints.biblio.unitn.it/415/
oai:eprints.biblio.unitn.it:416
2012-02-28T14:16:34Z
7374617475733D756E707562
7375626A656374733D51:5143:5143303230
74797065733D746563687265706F7274
QFT holography near the horizon of Schwarzschild-like spacetimes
Moretti, Valter
Pinamonti, Nicola
QC020 Mathematical Physics
It is argued that free QFT can be defined on the event horizon of a Schwarzschild-like spacetime and that that theory is unitarily and algebraically equivalent to QFT in the bulk (near the horizon). Under that unitary equivalence the bulk hidden SL(2,R) symmetry found in a previous work becomes manifest on the event horizon, it being induced by a group of horizon diffeomorphisms. The class of generators of that group can be enlarged to include a full Virasoro algebra of fields defined on the event horizon. These generators have a quantum representation in QFT on the event horizon and thus in the bulk.
2003-04
Departmental Technical Report
NonPeerReviewed
application/pdf
http://eprints.biblio.unitn.it/416/1/UTM641.pdf
Moretti, Valter and Pinamonti, Nicola (2003) QFT holography near the horizon of Schwarzschild-like spacetimes. UNSPECIFIED. (Unpublished)
http://eprints.biblio.unitn.it/416/
oai:eprints.biblio.unitn.it:439
2012-02-28T14:16:41Z
7374617475733D696E7072657373
7375626A656374733D51:5143:5143333231
74797065733D746563687265706F7274
On a model of phase relaxation for the hyperbolic Stefan problem
Recupero, Vincenzo
QC321 Heat - conduction
In this paper we study a model of phase relaxation for the Stefan problem with the Cattaneo-Maxwell heat flux law. We prove an existence and uniqueness result for the resulting problem and we show that its solution converges to the solution of the Stefan problem as the two relaxation parameters go to zero, provided a relation between these parameters holds.
2003
Departmental Technical Report
NonPeerReviewed
application/pdf
http://eprints.biblio.unitn.it/439/1/UTM643.pdf
Recupero, Vincenzo (2003) On a model of phase relaxation for the hyperbolic Stefan problem. UNSPECIFIED. (In Press)
http://eprints.biblio.unitn.it/439/
oai:eprints.biblio.unitn.it:440
2012-02-28T14:16:41Z
7374617475733D696E7072657373
7375626A656374733D51:5143:5143373630
74797065733D746563687265706F7274
A Reconstruction Procedure for Microwave Nondestructive Evaluation based on a Numerically Computed Green's Function
Caorsi, Salvatore
Massa, Andrea
Pastorino, Matteo
Randazzo, Andrea
Rosani, Andrea
QC760 Electromagnetism
This paper describes a new microwave diagnostic tool for nondestructive evaluation. The approach, developed in the spatial domain, is based on the numerical computation of the inhomogeneous Green’s function in order to fully exploit all the available a-priori information of the domain under test. The heavy reduction of the computational complexity of the proposed procedure (with respect to standard procedures based on the free-space Green’s function) is also achieved by means of a customized hybrid-coded genetic algorithm. In order to assess the effectiveness of the method, the results of several simulations are presented and discussed.
2003-06
Departmental Technical Report
NonPeerReviewed
application/pdf
http://eprints.biblio.unitn.it/440/1/039.pdf
Caorsi, Salvatore and Massa, Andrea and Pastorino, Matteo and Randazzo, Andrea and Rosani, Andrea (2003) A Reconstruction Procedure for Microwave Nondestructive Evaluation based on a Numerically Computed Green's Function. UNSPECIFIED. (In Press)
http://eprints.biblio.unitn.it/440/
oai:eprints.biblio.unitn.it:441
2012-02-28T14:16:42Z
7374617475733D696E7072657373
7375626A656374733D51:5143:5143373630
74797065733D746563687265706F7274
Improved Microwave Imaging Procedure for Non-Destructive Evaluations of Two-Dimensional Structures
Caorsi, Salvatore
Massa, Andrea
Pastorino, Matteo
Donelli, Massimo
QC760 Electromagnetism
An improved microwave procedure for detecting defects in dielectric structures is proposed. The procedure is based on the integral equations of the inverse scattering problem. A hybrid Genetic Algorithm is applied in order to minimize the obtained nonlinear functional. Since in nondestructive evaluations the unperturbed object is completely known, it is possible off-line to numerically compute the Green's function for the configuration without defects. Consequently, a very dignificant computation saving is obtained, since the 'chromosome' of the Genetic Algorithm codes only the parameters describing the unknown defect.
2003-06
Departmental Technical Report
NonPeerReviewed
application/pdf
http://eprints.biblio.unitn.it/441/1/040.pdf
Caorsi, Salvatore and Massa, Andrea and Pastorino, Matteo and Donelli, Massimo (2003) Improved Microwave Imaging Procedure for Non-Destructive Evaluations of Two-Dimensional Structures. UNSPECIFIED. (In Press)
http://eprints.biblio.unitn.it/441/
oai:eprints.biblio.unitn.it:444
2012-02-28T14:16:43Z
7374617475733D696E7072657373
7375626A656374733D51:5143:5143373630
74797065733D746563687265706F7274
Synthesis of sum and difference patterns for monopulse antennas by an hybrid real/integer-coded differential evolution method
Caorsi, Salvatore
Massa, Andrea
Pastorino, Matteo
Randazzo, Andrea
QC760 Electromagnetism
The synthesis of sum and difference patterns of monopulse antennas is considered in this paper. The synthesis problem is recast as an optimization problem by defining a suitable cost function based on the constraints on the side lobe levels. A subarray configuration is considered and the excitations of the difference pattern are approximately determined. The optimization problem is efficently solved by a differential evolution algorithm, wich is able to contemporarly handle real and integer unknowns. Numerical results are reported considering classic array configurations previusly assumed in the literature.
2003-07
Departmental Technical Report
NonPeerReviewed
application/pdf
http://eprints.biblio.unitn.it/444/1/043.pdf
Caorsi, Salvatore and Massa, Andrea and Pastorino, Matteo and Randazzo, Andrea (2003) Synthesis of sum and difference patterns for monopulse antennas by an hybrid real/integer-coded differential evolution method. UNSPECIFIED. (In Press)
http://eprints.biblio.unitn.it/444/
oai:eprints.biblio.unitn.it:446
2012-02-28T14:16:44Z
7374617475733D696E7072657373
7375626A656374733D51:5143:5143373630
74797065733D746563687265706F7274
Detection, Location and Imaging of Multiple Scatterers by means of the Iterative Multiscaling Method
Caorsi, Salvatore
Massa, Andrea
Donelli, Massimo
QC760 Electromagnetism
In this paper, a new version of the iterative multiscaling method (IMM) is proposed for reconstructing multiple scatterers in two-dimensional microwave imaging problems. The manuscript describes the new procedure evaluating the effectiveness of the IMM previously assessed for single object detection. Starting from inverse scattering integral equations, the problem is recast in a minimization one by defining iteratively (at each level of the scaling procedure) a suitable cost function allowing firstly a detection of the unknown objects, successively a location of the scatterers and finally a quantitative reconstruction of the scenario under test. Thanks to its properties, the approach allows an effective use of the information achievable from inverse scattering data. Morover, the adopted kind of expansion is able to deal with all possible multiresolution combinations in an easy and computationally inexpensive way. Selected numerical examples concerning dielectric as well as dissipative objects in noisy enviroments or starting from experimantally-acquired data are reported in order to confirm the usefulness of the introduced tool and of the effectiveness of the proposed procedure.
2003-07
Departmental Technical Report
NonPeerReviewed
application/pdf
http://eprints.biblio.unitn.it/446/1/044.pdf
Caorsi, Salvatore and Massa, Andrea and Donelli, Massimo (2003) Detection, Location and Imaging of Multiple Scatterers by means of the Iterative Multiscaling Method. UNSPECIFIED. (In Press)
http://eprints.biblio.unitn.it/446/
oai:eprints.biblio.unitn.it:551
2012-02-28T14:17:09Z
7374617475733D756E707562
7375626A656374733D54:5450
7375626A656374733D54:5443:5443313630
7375626A656374733D51:5143:5143383531
74797065733D746563687265706F7274
GEOTOP: A Hydrological Balance Model: Technical Description and Programs Guide,Version 0.75
Bertoldi, Giacomo
Rigon, Riccardo
TC160 Hydraulics
TP Chemical technology
QC851 Atmosphere
The study of the hydrologic cycle is physically focused on the analysis of the interactions between the soil surface (and specifically the soil water content, linked with precipitation) and the low atmosphere, which occur mainly through the mediation of the soil itself, the vegetation and the turbulent and radiative energy transfers which take place on the Earth's surface. In recent years, the hydrologic research has evolved towards a comprehensive theory describing the mass, energy and motion-quantity exchanges between surface and atmosphere at several scales. The practical aims of this efforts are: (1) to improve the mid- and long-term hydrologic forecasts; (2) to increase our capability of describing the impacts deriving from changes in the soil use and in the climate on the hydrologic cycle and on the Earth's ecosystems. The paper illustrate the implementation of GEOTOP, a distributed model of the hydrologic cycle which is meant to give a scientific contribution in this direction. GEOTOP is a terrain-based model, i.e. it is based on the employment of DEMs (digital elevation models); it is a distributed model, since all the simulated variables are returned for each pixel in the basin; it is a model of the hydrological cycle, in the sense that it simulates all the elements of the hydrological cycle, and not only the mass balance but also the energy balance: in fact the two balance equations are coupled by the evapotranspiration terms and by the soil temperature, which controls the soil hydraulic conductivity and the snow cover accumulation. As to the soil-atmosphere interaction, GEOTOP follows the treatment initially developed by Deardorf, and then implemented, with numerous changes, in land surface models either at global scale like BATS, NCAR-LSM, NOAH-LSM - or at larger scales like the VIC or at basin sclae like the DHSVM. The model adopts original solutions for the discharge calculation. In particular, it differs from the TOPMODEL, because it does not assume any stationeries conditions in the subsurface flows.
2004-02
Departmental Technical Report
NonPeerReviewed
application/pdf
http://eprints.biblio.unitn.it/551/1/geotop.pdf
Bertoldi, Giacomo and Rigon, Riccardo (2004) GEOTOP: A Hydrological Balance Model: Technical Description and Programs Guide,Version 0.75. UNSPECIFIED. (Unpublished)
http://eprints.biblio.unitn.it/551/
oai:eprints.biblio.unitn.it:631
2012-02-28T14:17:28Z
7374617475733D7375626D6974746564
7375626A656374733D51:5143:5143373630
74797065733D746563687265706F7274
Microwave Imaging from Limited-Angle Scattered Data using the Iterative Multi-Scaling Approach
Conci, Massimo
Donelli, Massimo
Franceschini, Gabriele
Massa, Andrea
QC760 Electromagnetism
In this paper, with reference to limited-angle data configurations, the performance of the nonlinear multi-scaling inversion approach (IMSA) is analyzed. Such an assessment is carried out by considering synthetically-generated as well as laboratory-controlled experimental data ('Marseille data') concerning two-dimensional dielectric scatterers. The obtained results demonstrate a satisfactory robustness and the reliability of the approach.
2004-07
Departmental Technical Report
NonPeerReviewed
application/pdf
http://eprints.biblio.unitn.it/631/1/DIT%2D04%2D063.pdf
Conci, Massimo and Donelli, Massimo and Franceschini, Gabriele and Massa, Andrea (2004) Microwave Imaging from Limited-Angle Scattered Data using the Iterative Multi-Scaling Approach. UNSPECIFIED. (Submitted)
http://eprints.biblio.unitn.it/631/
oai:eprints.biblio.unitn.it:632
2012-02-28T14:17:28Z
7374617475733D696E7072657373
7375626A656374733D51:5143:5143363631
74797065733D746563687265706F7274
An Adaptive Weighting Strategy for Microwave Imaging Problems
Bort, Emmanuele
Donelli, Massimo
Martini, Anna
Massa, Andrea
QC661 Electromagnetic Theory
In the framework of microwave imaging applications, an innovative strategy aimed at addressing the multi-objective inverse scattering problem is proposed. Starting from the spatial-domain integral formulation, the original multi-objective problem is recast into a single-objective one by defining a suitable cost function as a linear combination of the data and state terms according to variable weighting parameters. By iteratively tuning these paramenters, the optimization procedure is forced to solve an 'almost' multi-objective problem avoiding the use of ad-hoc multiple-objective optimization methods and satisfying different objectives in a balanced way. Selected numerical results indicate that the use of such a strategy yields to accurate reconstructions, with noise-corrupted data as well, by improving the performances of the adopted optimization procedure.
2004-08
Departmental Technical Report
NonPeerReviewed
application/pdf
http://eprints.biblio.unitn.it/632/1/DIT%2D04%2D064.pdf
Bort, Emmanuele and Donelli, Massimo and Martini, Anna and Massa, Andrea (2004) An Adaptive Weighting Strategy for Microwave Imaging Problems. UNSPECIFIED. (In Press)
http://eprints.biblio.unitn.it/632/
oai:eprints.biblio.unitn.it:633
2012-02-28T14:17:29Z
7374617475733D756E707562
7375626A656374733D51:5143:5143373630
74797065733D746563687265706F7274
Assessment of the Reliability and Exploitation of the Information Content of Inverse Scattering Data through a Fuzzy-Logic-Based Strategy - Preliminary Results
Casagranda, Aronne
Franceschini, Davide
Massa, Andrea
QC760 Electromagnetism
The presence of the noise in the measured data should be carefully considered in inverse scattering methodologies, because of the intrinsic ill-conditioning of the problem. To limit the effects of the noise on the retrieval procedure, this paper presents an innovative fuzzy-logic-based approach. The proposed strategy allows one to take into account the corrupted nature of the data by fully exploiting all the available information content of the measurements. Selected synthetic and experimental test cases are considered for assessing the effectiveness of the proposed approach also in comparison with a reference inverse scattering technique.
2004-08
Departmental Technical Report
NonPeerReviewed
application/pdf
http://eprints.biblio.unitn.it/633/1/DIT%2D04%2D065.pdf
Casagranda, Aronne and Franceschini, Davide and Massa, Andrea (2004) Assessment of the Reliability and Exploitation of the Information Content of Inverse Scattering Data through a Fuzzy-Logic-Based Strategy - Preliminary Results. UNSPECIFIED. (Unpublished)
http://eprints.biblio.unitn.it/633/
oai:eprints.biblio.unitn.it:634
2012-02-28T14:17:30Z
7374617475733D696E7072657373
7375626A656374733D51:5143:5143363631
7375626A656374733D51:5143:5143373630
74797065733D746563687265706F7274
Electromagnetic Detection of Dielectric Scatterers Using Phaseless Synthetic and Real Data and the Memetic Algorithm
Caorsi, Salvatore
Massa, Andrea
Pastorino, Matteo
Randazzo, Andrea
QC661 Electromagnetic Theory
QC760 Electromagnetism
Phaseless data are used to evaluate the application of an electromagnetic inverse-scattering-based procedure for the detection of cylindrical inhomogeneities, which are schematized as multylayer infinite dielectric cylinders with elliptic cross sections. The electromagnetic inverse problem is recast as a global optimization problem and iteratively solved by an efficient memetic algorithm, which combines deterministic and stochastic concepts. Moreover, a recursive analytical procedure is used for the forward scattering computation. The possibility of localizing and reconstructing the scatterers by using phaseless input data, which would greatly simplify the design of the imaging apparatus, is evaluated both with reference to synthetically produced data and by means of experimental data obtained by a microwave tomograph.
2004-08
Departmental Technical Report
NonPeerReviewed
application/pdf
http://eprints.biblio.unitn.it/634/1/DIT%2D04%2D066.pdf
Caorsi, Salvatore and Massa, Andrea and Pastorino, Matteo and Randazzo, Andrea (2004) Electromagnetic Detection of Dielectric Scatterers Using Phaseless Synthetic and Real Data and the Memetic Algorithm. UNSPECIFIED. (In Press)
http://eprints.biblio.unitn.it/634/
oai:eprints.biblio.unitn.it:635
2012-02-28T14:17:30Z
7374617475733D696E7072657373
7375626A656374733D51:5143:5143363631
7375626A656374733D51:5143:5143373630
74797065733D746563687265706F7274
A Multi-Source Strategy based on a Learning-by-Examples Technique for Buried Object Detection
Bermani, Emanuela
Boni, Andrea
Caorsi, Salvatore
Donelli, Massimo
Massa, Andrea
QC661 Electromagnetic Theory
QC760 Electromagnetism
In the framework of buried object detection and subsurface sensing, some of the main difficulties in the reconstruction process are certainly due to the aspect-limited nature of available measurement data and to the requirement of an on-line reconstruction. To limit these problems, a multi-source (MS) learning-by-example (LBE) technique is proposed in this paper. In order to fully exploit the more attractive features of the MS strategy, the proposed approach is based on a support vector machine (SVM). The effectiveness of the MS-LBE technique is evaluated by comparing the achieved results with those obtained by means of a previously developed single-source (SS) SVM-based procedure for an ideal as well as a noisy enviroment.
2004-08
Departmental Technical Report
NonPeerReviewed
application/pdf
http://eprints.biblio.unitn.it/635/1/DIT%2D04%2D067.pdf
Bermani, Emanuela and Boni, Andrea and Caorsi, Salvatore and Donelli, Massimo and Massa, Andrea (2004) A Multi-Source Strategy based on a Learning-by-Examples Technique for Buried Object Detection. UNSPECIFIED. (In Press)
http://eprints.biblio.unitn.it/635/
oai:eprints.biblio.unitn.it:636
2012-02-28T14:17:30Z
7374617475733D7375626D6974746564
7375626A656374733D51:5143:5143373630
74797065733D746563687265706F7274
Effective Exploitation of Multi-View Data through the Iterative Multi-Scaling Method - An Experimental Assessment
Donelli, Massimo
Franceschini, Davide
Franceschini, Gabriele
Massa, Andrea
QC760 Electromagnetism
The reconstruction capabilities of a microwave imaging algorithm can be enhanced by exploiting a multi-view measurement set-up. In the past, different researches have proved that collecting scattering data by probing the unknown scenario from different incidence angles, it allows to acquire more information on the scenario when the Iterative Multi-Scaling Approach (IMSA) is used to fully exploit multi-view data. In fact, unlike synthetic data, in real enviroment more measurements introduce larger systematic errors that could affect the physical constraints used in the inversion procedure and, consequently, the reconstruction process. Thus, the analysis is carried out by considering a set of experimental data concerning different scattering configurations involving single and multiple dielectric scatterers.
2004-08
Departmental Technical Report
NonPeerReviewed
application/pdf
http://eprints.biblio.unitn.it/636/1/DIT%2D04%2D068.pdf
Donelli, Massimo and Franceschini, Davide and Franceschini, Gabriele and Massa, Andrea (2004) Effective Exploitation of Multi-View Data through the Iterative Multi-Scaling Method - An Experimental Assessment. UNSPECIFIED. (Submitted)
http://eprints.biblio.unitn.it/636/
oai:eprints.biblio.unitn.it:637
2012-02-28T14:17:31Z
7374617475733D7375626D6974746564
7375626A656374733D51:5143:5143363631
7375626A656374733D51:5143:5143373630
74797065733D746563687265706F7274
A Classification Approach based on SVM for Electromagnetic Sub-Surface Sensing
Massa, Andrea
Bermani, Emanuela
Boni, Andrea
Donelli, Massimo
QC661 Electromagnetic Theory
QC760 Electromagnetism
In clearing terrains contamined or potentially contamined by landmines and/or unexploded ordnances (UXOs), a quick wide-area surveillance is often required. Nevertheless, the identification of dangerous areas (instead of the detection of each subsurface object) can be enough for some scenarios/applications, allowing a suitable level of security in a cost-saving way. In such a framework, this paper describes a probabilistic approach for the definition of risk maps. Starting from the measurement of the scattered electromagnetic field, the probability of occurrence of dangerous targets in an investigated subsurface area is determined through a suitably defined classifier based on a Support Vector Machine (SVM). To assess the effectiveness of the proposed approach and to evaluate its robustness, selected numerical results related to a two-dimensional geometry are presented.
2004-08
Departmental Technical Report
NonPeerReviewed
application/pdf
http://eprints.biblio.unitn.it/637/1/DIT%2D04%2D069.pdf
Massa, Andrea and Bermani, Emanuela and Boni, Andrea and Donelli, Massimo (2004) A Classification Approach based on SVM for Electromagnetic Sub-Surface Sensing. UNSPECIFIED. (Submitted)
http://eprints.biblio.unitn.it/637/
oai:eprints.biblio.unitn.it:638
2012-02-28T14:17:31Z
7374617475733D7375626D6974746564
7375626A656374733D51:5143:5143363631
7375626A656374733D51:5143:5143373630
74797065733D746563687265706F7274
Linear Antenna Synthesis with a Hybrid Genetic Algorithm
Donelli, Massimo
Caorsi, Salvatore
De Natale, Francesco
Pastorino, Matteo
Massa, Andrea
QC661 Electromagnetic Theory
QC760 Electromagnetism
An optimization problem for designing non-uniformly spaced, linear arrays is formulated and solved by means of an improved genetic algorithm (IGA) procedure. The proposed iterative method aims at array thinning and optimization of element positions and weights by minimizing the side-lobes level. Selected examples are included, which demonstrate the effectiveness and the design flexibility of the proposed method in the framework of electromagnetic synthesis of linear arrays.
2004-08
Departmental Technical Report
NonPeerReviewed
application/pdf
http://eprints.biblio.unitn.it/638/1/DIT%2D04%2D070.pdf
Donelli, Massimo and Caorsi, Salvatore and De Natale, Francesco and Pastorino, Matteo and Massa, Andrea (2004) Linear Antenna Synthesis with a Hybrid Genetic Algorithm. UNSPECIFIED. (Submitted)
http://eprints.biblio.unitn.it/638/
oai:eprints.biblio.unitn.it:639
2012-02-28T14:17:32Z
7374617475733D7375626D6974746564
7375626A656374733D51:5143:5143363631
7375626A656374733D51:5143:5143373630
74797065733D746563687265706F7274
Parallel GA-based Approach for Microwave Imaging Applications
Massa, Andrea
Donelli, Massimo
Caorsi, Salvatore
Pastorino, Matteo
Raffetto, Mirco
QC661 Electromagnetic Theory
QC760 Electromagnetism
Genetic algorithms (GAs) are well known optimization strategies able to deal with nonlinear functions as those arising in inverse scattering problems. However, they are computationally expensive thus offering poor performances in terms of general efficiency when compared with inversion techniques based on deterministic optimization methods. In this paper, a parallel implementation of an inverse scattering procedure based on a suitable hybrid genetic algorithm is presented. The proposed strategy is aimed at reducing the overall computational burden in order to make the approach competitive with gradient-based methods (GCs) in terms of runtime by preserving the capabilities of escaping from local minima. This results is achieved by fully exploiting the natural parallelism of evolutionary techniques and the searching capabilities of the hybrid approach. The effectiveness of the proposed implementation is demonstrated by considering a selected numerical benchmark related to a two-dimensional scattering geometry.
2004-08
Departmental Technical Report
NonPeerReviewed
application/pdf
http://eprints.biblio.unitn.it/639/1/DIT%2D04%2D071.pdf
Massa, Andrea and Donelli, Massimo and Caorsi, Salvatore and Pastorino, Matteo and Raffetto, Mirco (2004) Parallel GA-based Approach for Microwave Imaging Applications. UNSPECIFIED. (Submitted)
http://eprints.biblio.unitn.it/639/
oai:eprints.biblio.unitn.it:640
2012-02-28T14:17:32Z
7374617475733D7375626D6974746564
7375626A656374733D51:5143:5143363631
7375626A656374733D51:5143:5143373630
74797065733D746563687265706F7274
Location and Imaging of Two-Dimensional Scatterers by using a Particle Swarm Algoritm
Caorsi, Salvatore
Donelli, Massimo
Lommi, Andrea
Massa, Andrea
QC661 Electromagnetic Theory
QC760 Electromagnetism
In this paper, a microwave imaging method for reconstructing two-dimensional dielectric scatterers is presented. Starting from an integral formulation of the electromagnetic scattering phenomena, the method is aimed at determining the dielectric profile of the scatterer under test by means of an innovative particle swarm algorithm. In order to preliminary assess the effectiveness of the proposed method, some numerical experiments are carried out in noiseless as well as in noisy conditions. The obtained results confirm the capabilities of the proposed method in term of reconstruction accuracy and robustness.
2004-08
Departmental Technical Report
NonPeerReviewed
application/pdf
http://eprints.biblio.unitn.it/640/1/DIT%2D04%2D072.pdf
Caorsi, Salvatore and Donelli, Massimo and Lommi, Andrea and Massa, Andrea (2004) Location and Imaging of Two-Dimensional Scatterers by using a Particle Swarm Algoritm. UNSPECIFIED. (Submitted)
http://eprints.biblio.unitn.it/640/
oai:eprints.biblio.unitn.it:641
2012-02-28T14:17:32Z
7374617475733D7375626D6974746564
7375626A656374733D51:5143:5143363631
7375626A656374733D51:5143:5143373630
7375626A656374733D54:5431:5435352E34
74797065733D746563687265706F7274
A Microwave Imaging Method for NDE/NDT based on the SMW Technique for the Electromagnetic Field Prediction
Massa, Andrea
Pastorino, Matteo
Rosani, Andrea
Benedetti, Manuel
T055.4 Industrial Engineering
QC661 Electromagnetic Theory
QC760 Electromagnetism
In the framework of NDE/NDT, this paper presents an innovative microwave diagnostic approach based on the use of the SMW inversion procedure for the electric field prediction. Starting from the integral form of inverse scattering equations, the problem of determining the presence of an unknown defect in a known host domain is recast into an optimization one by defining a suitable cost function and reducing the problem unknowns only to the flaw descriptors. By considering an effective inversion technique based on the SMW formula, the estimation of the secondary unknowns (namely, the electric field distributions) is performed in a cost-effective way. Selecte3d numerical results are presented to validate the approach showing current potentialities and limitations. For completeness, an application to civil engineering is also reported.
2004-08
Departmental Technical Report
NonPeerReviewed
application/pdf
http://eprints.biblio.unitn.it/641/1/DIT%2D04%2D073.pdf
Massa, Andrea and Pastorino, Matteo and Rosani, Andrea and Benedetti, Manuel (2004) A Microwave Imaging Method for NDE/NDT based on the SMW Technique for the Electromagnetic Field Prediction. UNSPECIFIED. (Submitted)
http://eprints.biblio.unitn.it/641/
oai:eprints.biblio.unitn.it:642
2012-02-28T14:17:33Z
7374617475733D7375626D6974746564
7375626A656374733D51:5143:5143363631
7375626A656374733D51:5143:5143373630
74797065733D746563687265706F7274
Analysis of the stability and Robustness of the Iterative Multi-Scaling Approach for Microwave Imaging Applications
Caorsi, Salvatore
Donelli, Massimo
Massa, Andrea
QC661 Electromagnetic Theory
QC760 Electromagnetism
In a reconstruction procedure based on the iterative solution of inverse scattering integral equations, the quality of the final image depends on both the numerical and experimental noise. Numerical noise is related to the accuracy of the numerical representation of the microwave imaging apparatus and system geometry. Experimental noise refers to the non-ideal electromagnetic conditions in which the data acquisition is performed. This paper provides a systematic evaluation of the impact of the most significant sources of numerical and experimental noise on the reconstruction quality when the Iterative Multi-Scaling Approach (IMSA) is used. The assessment of the robustness and stability of the IMSA is carried out by considering synthetic as well as real data. The achieved results provide detailed indications on the range of applicability of the IMSA for qualitative and/or quantitative imaging purposes.
2004-08
Departmental Technical Report
NonPeerReviewed
application/pdf
http://eprints.biblio.unitn.it/642/1/DIT%2D04%2D074.pdf
Caorsi, Salvatore and Donelli, Massimo and Massa, Andrea (2004) Analysis of the stability and Robustness of the Iterative Multi-Scaling Approach for Microwave Imaging Applications. UNSPECIFIED. (Submitted)
http://eprints.biblio.unitn.it/642/
oai:eprints.biblio.unitn.it:643
2012-02-28T14:17:34Z
7374617475733D7375626D6974746564
7375626A656374733D51:5143:5143363631
7375626A656374733D51:5143:5143373630
74797065733D746563687265706F7274
A Versatile Enhanced Genetic Algorithm for Planar Array Design
Donelli, Massimo
Caorsi, Salvatore
De Natale, Francesco
Franceschini, Davide
Massa, Andrea
QC661 Electromagnetic Theory
QC760 Electromagnetism
In order to synthesize planar, sparse, and aperiodic arrays, a numerical procedure based on an enhanced genetic algorithm is proposed. The method maximizes a suitably defined single-objective fitness function iteratively acting on the states and the weights of the elements of the array. Such a cost function is related to the shape of the desired beam pattern, to the number of active elements and to others user-defined array-pattern constraints. To preliminarily assess the effectiveness of the approach, selected numerical experiments are performed. The obtained results seem to confirm its feasibility. Moreover, given the heterogeneity of the test benchmarks, the versatility is pointed out as a key-feature of the implemented methodology.
2004-08
Departmental Technical Report
NonPeerReviewed
application/pdf
http://eprints.biblio.unitn.it/643/1/DIT%2D04%2D075.pdf
Donelli, Massimo and Caorsi, Salvatore and De Natale, Francesco and Franceschini, Davide and Massa, Andrea (2004) A Versatile Enhanced Genetic Algorithm for Planar Array Design. UNSPECIFIED. (Submitted)
http://eprints.biblio.unitn.it/643/
oai:eprints.biblio.unitn.it:644
2012-02-28T14:17:34Z
7374617475733D7375626D6974746564
7375626A656374733D51:5143:5143363631
7375626A656374733D51:5143:5143373630
74797065733D746563687265706F7274
A Computational Approach based on a Particle Swarm Optimizer for Microwave Imaging of Two-Dimensional Dielectric Scatterers
Donelli, Massimo
Massa, Andrea
QC661 Electromagnetic Theory
QC760 Electromagnetism
A computational approach based on an innovative stochastic algorithm, namely the Particle Swarm Optimizer (PSO), is proposed for the solution of the inverse scattering problem arising in microwave imaging applications. The original inverse scattering problem is reformulated in a global nonlinear optimization one by defining a suitable cost function, which is minimized through a customized PSO. In such a framework, the paper is aimed at assessing the effectiveness of the proposed approach in locating, shaping, and reconstructing the dielectric parameters of unknown two-dimensional scatterers. Such an analysis is carried out by comparing the performance of the PSO-based approach with others state-of-the-art methods (deterministic as well as stochastic) in terms of retrieval accuracy as well as from a computational point of view. Moreover, an integrated strategy (based on the combination of the PSO and the iterative multi-scaling method (IMM) is proposed and analyzed to fully exploit complementary advantages of nonlinear optimization techniques and multi-resolution approaches. Selected numerical experiments, concerning dielectric scatterers different in shape, dimension, and dielectric profile, are performed starting from synthetic as well as experimental inverse scattering data.
2004-08
Departmental Technical Report
NonPeerReviewed
application/pdf
http://eprints.biblio.unitn.it/644/1/DIT%2D04%2D076.pdf
Donelli, Massimo and Massa, Andrea (2004) A Computational Approach based on a Particle Swarm Optimizer for Microwave Imaging of Two-Dimensional Dielectric Scatterers. UNSPECIFIED. (Submitted)
http://eprints.biblio.unitn.it/644/
oai:eprints.biblio.unitn.it:645
2012-02-28T14:17:35Z
7374617475733D7375626D6974746564
7375626A656374733D51:5143:5143363631
7375626A656374733D51:5143:5143373630
74797065733D746563687265706F7274
On the Use of a Genetic-Based Approach for Antenna Array Control in a Scattering Environment
Sacchi, Claudio
Donelli, Massimo
De Natale, Francesco G.B.
Massa, Andrea
Lommi, Andrea
QC661 Electromagnetic Theory
QC760 Electromagnetism
In this letter, an approach to adaptive antenna array optimisation based on genetic algorithms is assessed in a realistic scattering environment, where interfering signals are modelled using the Student's t-distribution. Simulation results demonstrate the effectiveness of the proposed array control strategy.
2004-08
Departmental Technical Report
NonPeerReviewed
application/pdf
http://eprints.biblio.unitn.it/645/1/DIT%2D04%2D077.pdf
Sacchi, Claudio and Donelli, Massimo and De Natale, Francesco G.B. and Massa, Andrea and Lommi, Andrea (2004) On the Use of a Genetic-Based Approach for Antenna Array Control in a Scattering Environment. UNSPECIFIED. (Submitted)
http://eprints.biblio.unitn.it/645/
oai:eprints.biblio.unitn.it:646
2012-02-28T14:17:35Z
7374617475733D7375626D6974746564
7375626A656374733D51:5143:5143363631
7375626A656374733D51:5143:5143373630
74797065733D746563687265706F7274
A Reconstruction Procedure for Microwave Nondestructive Evaluation based on a Numerically Computed Green's Function
Caorsi, Salvatore
Massa, Andrea
Pastorino, Matteo
Randazzo, Andrea
Rosani, Andrea
QC661 Electromagnetic Theory
QC760 Electromagnetism
In the framework of NDE/NDT, this paper presents a new microwave diagnostic tool. The approach, developed in the spatial domain, is based on the numerical computation of the inhomogeneous Green's function in order to fully exploit all the available a-priori information of the domain under test. The heavy reduction of the computational complexity of the proposed procedure (with respect to standard free-space Green's function based procedures) is also achieved by means of a customized hybrid-coded genetic algorithm. In order to assess the effectiveness of the method, the results of several realistic simulations are presented and deeply discussed.
2004-08
Departmental Technical Report
NonPeerReviewed
application/pdf
http://eprints.biblio.unitn.it/646/1/DIT%2D04%2D078.pdf
Caorsi, Salvatore and Massa, Andrea and Pastorino, Matteo and Randazzo, Andrea and Rosani, Andrea (2004) A Reconstruction Procedure for Microwave Nondestructive Evaluation based on a Numerically Computed Green's Function. UNSPECIFIED. (Submitted)
http://eprints.biblio.unitn.it/646/
oai:eprints.biblio.unitn.it:647
2012-02-28T14:17:36Z
7374617475733D7375626D6974746564
7375626A656374733D51:5143:5143363631
7375626A656374733D51:5143:5143373630
74797065733D746563687265706F7274
Microwave Medical Imaging: Potentialities and Limitations of a Stochastic Optimization Technique
Caorsi, Salvatore
Massa, Andrea
Pastorino, Matteo
Rosani, Andrea
QC661 Electromagnetic Theory
QC760 Electromagnetism
An approach based on a stochastic optimization technique is proposed for medical microwave imaging. The approach is based on the integral equations of the electromagnetic inverse scattering. After discretization of the continuous model, the problem solution is recast as a global optimization problem. A functional is costructed on the basis of a Markov random field model and minimized by a genetic algorithm. In order to reduce the computational load, a model of the cross section of the biological body is considered. In this way, the investigation area is limited by separating the scattering contribution of a fixed region under test from those of other parts of the model. Some preliminary results concerning a two-dimensional model of a human thorax are reported. Such a biological structure is inspected by the proposed tomographic approach in order to detect and localize the presence of and "object" modeling a tumor.
2004-08
Departmental Technical Report
NonPeerReviewed
application/pdf
http://eprints.biblio.unitn.it/647/1/DIT%2D04%2D079.pdf
Caorsi, Salvatore and Massa, Andrea and Pastorino, Matteo and Rosani, Andrea (2004) Microwave Medical Imaging: Potentialities and Limitations of a Stochastic Optimization Technique. UNSPECIFIED. (Submitted)
http://eprints.biblio.unitn.it/647/
oai:eprints.biblio.unitn.it:668
2012-02-28T14:17:41Z
7374617475733D756E707562
7375626A656374733D51:5143:5143303230
74797065733D746563687265706F7274
Central Charges and Boundary Fields for two Dimensional Dilatonic Black Holes
Pinamonti, Nicola
Vanzo, Luciano
QC020 Mathematical Physics
In this paper we first show that within the Hamiltonian description of general relativity, the central charge of a near horizon asymptotic symmetry group is zero, and therefore that the entropy of the system cannot be estimated using Cardy’s formula. This is done by mapping a static black hole to a two dimensional space. We explain how such a charge can only appear to a static observer who chooses to stay permanently outside the black hole. Then an alternative argument is given for the presence of a universal central charge. Finally we suggest an effective quantum theory on the horizon that is compatible with the thermodynamics behaviour of the black hole.
2003
Departmental Technical Report
NonPeerReviewed
application/pdf
http://eprints.biblio.unitn.it/668/1/UTM657.pdf
Pinamonti, Nicola and Vanzo, Luciano (2003) Central Charges and Boundary Fields for two Dimensional Dilatonic Black Holes. UNSPECIFIED. (Unpublished)
http://eprints.biblio.unitn.it/668/
oai:eprints.biblio.unitn.it:688
2012-02-28T14:17:45Z
7374617475733D696E7072657373
7375626A656374733D51:5143:5143363631
7375626A656374733D51:5143:5143373630
74797065733D746563687265706F7274
An Integrated Multi-Scaling Strategy based on a Particle Swarm Algorithm for Inverse Scattering Problems
Donelli, Massimo
Franceschini, Gabriele
Martini, Anna
Massa, Andrea
QC661 Electromagnetic Theory
QC760 Electromagnetism
The application of a multiscale strategy integrated with a stochastic technique to the solution of nonlinear inverse scattering problems is presented. The approach allows for the explicit and easy handling of many difficulties associated with such a problem ranging from ill-conditioning to nonlinearity and false solutions drawback. The choice of a finite dimensional representation for the unknowns, due to the upper bound to the essential dimension of the data, is iteratively accomplished by means of an adaptive multi-resolution model, which offers considerable flexibility for the inclusion of the a-priori knowledge and of the knowledge acquired during the iterative steps of the multiscaling process. Even though a suitable representation of the unknowns could limit the local minima problem, the multi-resolution strategy is integrated with a customized stochastic optimizer based on the behavior of a particle swarm (PSO), which allows to prevent that nonlinearity could induce the solution algorithm into false solutions without a large increasing of the overall computational burden. Selected examples are presented by considering a two-dimensional microwave imaging problem so as to illustrate the key features of the integrated stochastic multi-scaling strategy.
2004-10
Departmental Technical Report
NonPeerReviewed
application/pdf
http://eprints.biblio.unitn.it/688/1/DIT%2D04%2D081.pdf
Donelli, Massimo and Franceschini, Gabriele and Martini, Anna and Massa, Andrea (2004) An Integrated Multi-Scaling Strategy based on a Particle Swarm Algorithm for Inverse Scattering Problems. UNSPECIFIED. (In Press)
http://eprints.biblio.unitn.it/688/
oai:eprints.biblio.unitn.it:689
2012-02-28T14:17:45Z
7374617475733D696E7072657373
7375626A656374733D51:5143:5143363631
7375626A656374733D51:5143:5143373630
74797065733D746563687265706F7274
Improving the Effectiveness of GA-Based Approaches to Microwave Imaging through an Innovative Parabolic Crossover
Bort, Emmanuele
Massa, Andrea
Rocca, Paolo
QC661 Electromagnetic Theory
QC760 Electromagnetism
Several studies have shown that evolutionary-based approaches are efficient, effective, and robust optimization methods for microwave imaging. However, the convergence rate of such techniques still does not meet all the requirements for on-line real applications and attempting to speed up the optimization is needed. In this paper, a new local search operator, the fitness-based parabolic crossover, is proposed and embedded into a real-coded genetic algorithm. Such a modification enables the imaging method to achieve a better trade-off between convergence rate and robustness to false solutions. By exploiting the relationship between the crossover operation and the local quadratic behavior of the functional, it is possible to increase the convergence rate of the genetic algorithm and thereby to obtain an acceptable solution with a smaller number of fitness function evaluations. The effectiveness of the modified genetic-algorithm-based imaging method is assessed by considering some synthetic test cases different in dimensions and noisy conditions. The obtained numerical results provide an empirical evidence of the efficiency and reliability of the proposed modified evolutionary algorithm.
2004-10
Departmental Technical Report
NonPeerReviewed
application/pdf
http://eprints.biblio.unitn.it/689/1/DIT%2D04%2D096.pdf
Bort, Emmanuele and Massa, Andrea and Rocca, Paolo (2004) Improving the Effectiveness of GA-Based Approaches to Microwave Imaging through an Innovative Parabolic Crossover. UNSPECIFIED. (In Press)
http://eprints.biblio.unitn.it/689/
oai:eprints.biblio.unitn.it:690
2012-02-28T14:17:45Z
7374617475733D696E7072657373
7375626A656374733D51:5143:5143363631
7375626A656374733D51:5143:5143373630
74797065733D746563687265706F7274
An Innovative Fuzzy-Logic-Based Strategy for an Effective Exploitation of Noisy Inverse Scattering Data
Azaro, Renzo
Casagranda, Aronne
Franceschini, Davide
Massa, Andrea
QC661 Electromagnetic Theory
QC760 Electromagnetism
This paper presents an innovative inverse scattering approach based on a fuzzy-logic strategy aimed at fully exploiting the information content of the scattered data in a microwave imaging system. The effectiveness of the proposed method is assessed through the results of a numerical analysis concerned with the reconstruction of single as well as multiple dielectric targets in various noisy environments. For comparison purposes, the obtained performance are compared with those of a standard method in terms of reconstruction accuracy and computational load to point out the improvement induced by the proposed approach.
2004-10
Departmental Technical Report
NonPeerReviewed
application/pdf
http://eprints.biblio.unitn.it/690/1/DIT%2D04%2D097.pdf
Azaro, Renzo and Casagranda, Aronne and Franceschini, Davide and Massa, Andrea (2004) An Innovative Fuzzy-Logic-Based Strategy for an Effective Exploitation of Noisy Inverse Scattering Data. UNSPECIFIED. (In Press)
http://eprints.biblio.unitn.it/690/
oai:eprints.biblio.unitn.it:744
2012-02-28T14:17:56Z
7374617475733D696E7072657373
7375626A656374733D51:5143:5143373630
74797065733D746563687265706F7274
On the Enhancement of the Reconstruction Accuracy obtained with a Multi-Source/Multi-Illumination Inverse Scattering Technique
Franceschini, Davide
Massa, Andrea
QC760 Electromagnetism
This paper explores the possibility of enhancing the available information content of scattered data by means of an innovative Multi-Source strategy. The approach exploits the scattering interactions between scatterer and probing source when the investigation domain is illuminated by different (in terms of radiation patterns) illuminations. The results of a set of representative numerical simulations are shown to point out the potentialities of the inversion strategy.
2005-01
Departmental Technical Report
NonPeerReviewed
application/pdf
http://eprints.biblio.unitn.it/744/1/DIT%2D05%2D003.pdf
Franceschini, Davide and Massa, Andrea (2005) On the Enhancement of the Reconstruction Accuracy obtained with a Multi-Source/Multi-Illumination Inverse Scattering Technique. UNSPECIFIED. (In Press)
http://eprints.biblio.unitn.it/744/
oai:eprints.biblio.unitn.it:780
2012-02-28T14:18:06Z
7374617475733D756E707562
7375626A656374733D51:5143:51433137342E31372E503237
7375626A656374733D51:5143:51433137342E32
74797065733D746865736973
Feynman Path Integrals
Mazzucchi, Sonia
QC174.2 Schrodinger Equation
QC174.17.P27 Integrals, path
Not available
2003
Thesis
NonPeerReviewed
application/pdf
http://eprints.biblio.unitn.it/780/1/PhDTS39.pdf
Mazzucchi, Sonia (2003) Feynman Path Integrals. UNSPECIFIED thesis, UNSPECIFIED.
http://eprints.biblio.unitn.it/780/
oai:eprints.biblio.unitn.it:802
2012-02-28T14:18:11Z
7374617475733D696E7072657373
7375626A656374733D51:5143:5143363631
7375626A656374733D51:5143:5143373630
74797065733D746563687265706F7274
Multiscaling Reconstruction of Metallic Targets from TE and TM Experimental Data
Azaro, Renzo
Donelli, Massimo
Franceschini, Davide
Massa, Andrea
QC661 Electromagnetic Theory
QC760 Electromagnetism
The non invasive imaging of unknown objects is of particular interest in several industrial applications. In this letter, an iterative multi-resolution strategy (IMRS) is applied to the reconstruction of metallic targets from experimental measurements. A representative test case is presented for evaluating the effectiveness of the IMRS in dealing with real data collected in a controlled environment in both TE and TM illuminations.
2005-05
Departmental Technical Report
NonPeerReviewed
application/pdf
http://eprints.biblio.unitn.it/802/1/DIT%2D05%2D004.pdf
Azaro, Renzo and Donelli, Massimo and Franceschini, Davide and Massa, Andrea (2005) Multiscaling Reconstruction of Metallic Targets from TE and TM Experimental Data. UNSPECIFIED. (In Press)
http://eprints.biblio.unitn.it/802/
oai:eprints.biblio.unitn.it:811
2012-02-28T14:18:13Z
7374617475733D756E707562
7375626A656374733D51:5143:5143363631
7375626A656374733D51:5143:5143373630
74797065733D746563687265706F7274
An Innovative Microwave Imaging Technique for Non Destructive Evaluation: Applications to Civil Structures Monitoring and Biological Bodies Inspection
Benedetti, Manuel
Donelli, Massimo
Martini, Anna
Massa, Andrea
Rosani, Andrea
QC661 Electromagnetic Theory
QC760 Electromagnetism
Industrial and biomedical applications of microwave imaging techniques based on inverse scattering integral relations have become more and more important. In order to reduce the computational costs, allowing a quasi real-time processing, an innovative inversion procedure based on the use of a Genetic Algorithm and on the Sherman-Morrison-Woodbury matrix inversion method is presented. Selected numerical results, concerning various scenarios and scatterer dimensions, are presented in order to give some indications on the effectiveness but also current limitations of the proposed approach.
2005-05
Departmental Technical Report
PeerReviewed
application/pdf
http://eprints.biblio.unitn.it/811/1/DIT%2D05%2D004.pdf
Benedetti, Manuel and Donelli, Massimo and Martini, Anna and Massa, Andrea and Rosani, Andrea (2005) An Innovative Microwave Imaging Technique for Non Destructive Evaluation: Applications to Civil Structures Monitoring and Biological Bodies Inspection. UNSPECIFIED. (Unpublished)
http://eprints.biblio.unitn.it/811/
oai:eprints.biblio.unitn.it:812
2012-02-28T14:18:13Z
7374617475733D756E707562
7375626A656374733D51:5143:5143363631
7375626A656374733D51:5143:5143373630
74797065733D746563687265706F7274
Tomographic Sub-Surface Detection of Defects by means of a GA-based Inverse Scattering Procedure
Benedetti, Manuel
Donelli, Massimo
Massa, Andrea
Pastorino, Matteo
Rosani, Andrea
QC661 Electromagnetic Theory
QC760 Electromagnetism
In this paper, an assessment of the integrated genetic-algorithm strategy based on a numerically computed Green's function for subsurface inverse scattering problems arising in NDE/NDT industrial applications is presented. To show the effectiveness and current limitations of the approach in dealing with various scenarios characterized by lossless and lossy host media as well as in noisy environments, several numerical experiments are considered. The obtained results confirm the effectiveness of the approach in fully exploiting the available a-priori information through a suitable scattering model, which allows a non-negligible enhancement of the reconstruction accuracy as well as a reduction of the overall computational burden with respect to standard inverse scattering approaches.
2005-05
Departmental Technical Report
PeerReviewed
application/pdf
http://eprints.biblio.unitn.it/812/1/DIT%2D05%2D005.pdf
Benedetti, Manuel and Donelli, Massimo and Massa, Andrea and Pastorino, Matteo and Rosani, Andrea (2005) Tomographic Sub-Surface Detection of Defects by means of a GA-based Inverse Scattering Procedure. UNSPECIFIED. (Unpublished)
http://eprints.biblio.unitn.it/812/
oai:eprints.biblio.unitn.it:813
2012-02-28T14:18:14Z
7374617475733D756E707562
7375626A656374733D51:5143:5143363631
7375626A656374733D51:5143:5143373630
74797065733D746563687265706F7274
Effective Exploitation of the a-priori Information through a Microwave Imaging Procedure Based on the Smw for Nde/Ndt Applications
Benedetti, Manuel
Donelli, Massimo
Franceschini, Gabriele
Pastorino, Matteo
Massa, Andrea
QC661 Electromagnetic Theory
QC760 Electromagnetism
This paper presents an innovative microwave technique, which is suitable for the detection of defects in non-destructive-evaluation (NDT/NDE) applications where a lot of a-priori information is available. The proposed approach is based on the equations of the inverse scattering problem, which are solved by means of a minimization procedure based on a Genetic Algorithm (GA). To reduce the number of problem unknowns, the available a-priori information is efficiently exploited by introducing an updating procedure for the electric field computation based on the Sherman-Morrison-Woodbury (SWM) formula. The results of a representative set of numerical experiments as well as comparisons with state-of-the-art methods are reported. They confirm the effectiveness, the feasibility and the robustness of the proposed approach, which some interesting features by a computational point-of-view, as well.
2005-05
Departmental Technical Report
PeerReviewed
application/pdf
http://eprints.biblio.unitn.it/813/1/DIT%2D05%2D006.pdf
Benedetti, Manuel and Donelli, Massimo and Franceschini, Gabriele and Pastorino, Matteo and Massa, Andrea (2005) Effective Exploitation of the a-priori Information through a Microwave Imaging Procedure Based on the Smw for Nde/Ndt Applications. UNSPECIFIED. (Unpublished)
http://eprints.biblio.unitn.it/813/
oai:eprints.biblio.unitn.it:814
2012-02-28T14:18:14Z
7374617475733D696E7072657373
7375626A656374733D51:5143:5143363631
7375626A656374733D51:5143:5143373630
74797065733D746563687265706F7274
Design of an Integrated Antenna for Automotive Systems
Azaro, Renzo
Boato, Giulia
De Natale, Francesco
Franceschini, Gabriele
Martini, Anna
Massa, Andrea
QC661 Electromagnetic Theory
QC760 Electromagnetism
This paper describes the design process of an integrated antenna for an automotive rescue system. In order to fulfill the antenna design requirements in different frequency bands and to minimize the interference phenomena arising from the integration of different classes of antennas in a single device, a two-phases stochastic optimization approach is used. The experimental validation carried out on the developed prototype confirms the effectiveness of the proposed approach.
2005-06
Departmental Technical Report
PeerReviewed
application/pdf
http://eprints.biblio.unitn.it/814/1/DIT%2D05%2D007.pdf
Azaro, Renzo and Boato, Giulia and De Natale, Francesco and Franceschini, Gabriele and Martini, Anna and Massa, Andrea (2005) Design of an Integrated Antenna for Automotive Systems. UNSPECIFIED. (In Press)
http://eprints.biblio.unitn.it/814/
oai:eprints.biblio.unitn.it:816
2012-02-28T14:18:15Z
7374617475733D696E7072657373
7375626A656374733D51:5143:5143363631
7375626A656374733D51:5141:51413735
7375626A656374733D51:5143:5143373630
7375626A656374733D51:5143:51433130302E35
74797065733D746563687265706F7274
Unsupervised Synthesis of Microwave Components by Means of an Evolutionary-Based Tool Exploiting Distributed Computing Resources
Donelli, Massimo
Azaro, Renzo
Massa, Andrea
Raffetto, Mirco
QC661 Electromagnetic Theory
QC760 Electromagnetism
QA075 Electronic computers. Computer science
QC100.5 Measuring Instruments
A parallel implementation of an automatic CAD tool based on the parallel virtual machine software package, genetic algorithms and finite element simulators is presented. It is shown that the parallel implementation can be obtained by developing just a few hundred lines of code and a pseudocode description is provided. Finally, selected numerical results are provided in order to show the effectiveness and the reliability of the proposed approach.
2005-06
Departmental Technical Report
PeerReviewed
application/pdf
http://eprints.biblio.unitn.it/816/1/DIT%2D05%2D008.pdf
Donelli, Massimo and Azaro, Renzo and Massa, Andrea and Raffetto, Mirco (2005) Unsupervised Synthesis of Microwave Components by Means of an Evolutionary-Based Tool Exploiting Distributed Computing Resources. UNSPECIFIED. (In Press)
http://eprints.biblio.unitn.it/816/
oai:eprints.biblio.unitn.it:817
2012-02-28T14:18:15Z
7374617475733D696E7072657373
7375626A656374733D51:5143:5143353031
7375626A656374733D51:5143:5143373630
74797065733D746563687265706F7274
Design of a Miniaturized Ism-Band Fractal Antenna
Azaro, Renzo
Boato, Giulia
Donelli, Massimo
Franceschini, Gabriele
Martini, Anna
Massa, Andrea
QC501 Electricity
QC760 Electromagnetism
Miniaturization techniques for antenna design based on fractal geometries are of growing interest in wireless communications. In this letter, the design of a miniaturized fractal antenna prototype is described. Towards this end, a particle swarm optimizer is used to simultaneously optimize the fractal shape as wll as the input impedance by acting on the thickness of the antenna segments to avoid matching networks. The effectiveness of the approach is confirmed by means of simulated as well as experimental results
2005-06
Departmental Technical Report
PeerReviewed
application/pdf
http://eprints.biblio.unitn.it/817/1/DIT%2D05%2D009.pdf
Azaro, Renzo and Boato, Giulia and Donelli, Massimo and Franceschini, Gabriele and Martini, Anna and Massa, Andrea (2005) Design of a Miniaturized Ism-Band Fractal Antenna. UNSPECIFIED. (In Press)
http://eprints.biblio.unitn.it/817/
oai:eprints.biblio.unitn.it:818
2012-02-28T14:18:15Z
7374617475733D696E7072657373
7375626A656374733D51:5143:5143363631
7375626A656374733D51:5143:5143373630
74797065733D746563687265706F7274
Full-Vectorial Three-Dimensional Microwave Imaging Through the Iterative Multi-Scaling Strategy: a Preliminary Assessment
Franceschini, Gabriele
Franceschini, Davide
Massa, Andrea
QC661 Electromagnetic Theory
QC760 Electromagnetism
In this paper, a multi-scaling strategy for full-vectorial three-dimensional inverse scattering problems is presented. The approach is fully iterative and it avoids solving any forward problem at each step. Thanks to the adaptive multi-resolution model, which offers considerable flexibility for the inclusion of the a-priori knowledge and of the knowledge acquired during the iterative steps of the multi-scaling process, the overall computational burden is considerably reduced. This allows to balance effectively the trade-off between computational costs and achievable resolution accuracy. The effectiveness of the proposed approach is demonstrated through a selected set of preliminary experiments using homogeneous dielectric scatterers in a noisy synthetic environment.
2005-06
Departmental Technical Report
PeerReviewed
application/pdf
http://eprints.biblio.unitn.it/818/1/DIT%2D05%2D010.pdf
Franceschini, Gabriele and Franceschini, Davide and Massa, Andrea (2005) Full-Vectorial Three-Dimensional Microwave Imaging Through the Iterative Multi-Scaling Strategy: a Preliminary Assessment. UNSPECIFIED. (In Press)
http://eprints.biblio.unitn.it/818/
oai:eprints.biblio.unitn.it:819
2012-02-28T14:18:16Z
7374617475733D696E7072657373
7375626A656374733D51:5143:5143363631
7375626A656374733D51:5143:5143373630
74797065733D746563687265706F7274
Multiscaling Reconstruction of Metallic Targets from Te and Tm Experimental Data
Azaro, Renzo
Donelli, Massimo
Franceschini, Davide
Massa, Andrea
QC661 Electromagnetic Theory
QC760 Electromagnetism
The non invasive imaging of unknown objects is of particular interest in several industrial applications. In this letter, an iterative multi-resolution strategy (IMRS) is applied to the reconstruction of metallic targets from experimental measurements. A representative test case is presented for evaluating the effectiveness of the IMRS in dealing with real data collected in a controlled environment in both TE and TM illuminations.
2005-06
Departmental Technical Report
PeerReviewed
application/pdf
http://eprints.biblio.unitn.it/819/1/DIT%2D05%2D011.pdf
Azaro, Renzo and Donelli, Massimo and Franceschini, Davide and Massa, Andrea (2005) Multiscaling Reconstruction of Metallic Targets from Te and Tm Experimental Data. UNSPECIFIED. (In Press)
http://eprints.biblio.unitn.it/819/
oai:eprints.biblio.unitn.it:830
2012-02-28T14:18:22Z
7374617475733D756E707562
7375626A656374733D51:5143:5143303230
74797065733D746563687265706F7274
De Sitter quantum scalar field and horizon holography
Pinamonti, Nicola
QC020 Mathematical Physics
Available in the .pdf file
2005-05
Departmental Technical Report
PeerReviewed
application/pdf
http://eprints.biblio.unitn.it/830/1/UTM681_may_2005.pdf
Pinamonti, Nicola (2005) De Sitter quantum scalar field and horizon holography. UNSPECIFIED. (Unpublished)
http://eprints.biblio.unitn.it/830/
oai:eprints.biblio.unitn.it:892
2012-02-28T14:18:40Z
7374617475733D7375626D6974746564
7375626A656374733D51:5143:5143363631
7375626A656374733D51:5143:5143353031
7375626A656374733D51:5141:51413735
7375626A656374733D51:5143:5143373630
74797065733D746563687265706F7274
Design of a Pre-Fractal Monopolar Antenna for 3.4 - 3.6 GHz Wi-Max Band Portable Devices
Azaro, Renzo
Boato, Giulia
Donelli, Massimo
Massa, Andrea
Zeni, Edoardo
QC661 Electromagnetic Theory
QC501 Electricity
QC760 Electromagnetism
QA075 Electronic computers. Computer science
In this letter, the design of a miniaturized monopolar pre-fractal antenna for the 3.4 - 3.6 GHz Wi-Max band is presented. The geometrical configuration of the monopolar antenna, printed on a planar dielectric substratum, has been synthesized by means of a Particle Swarm Optimizer in order to minimize the linear dimensions of the device and to obtain Voltage Standing Wave Ratio values within specifications. The results of numerical simulations are shown and compared, in terms of VSWR, with the experimental measurements.
2005-08
Departmental Technical Report
PeerReviewed
application/pdf
http://eprints.biblio.unitn.it/892/1/DIT%2D05%2D057.pdf
Azaro, Renzo and Boato, Giulia and Donelli, Massimo and Massa, Andrea and Zeni, Edoardo (2005) Design of a Pre-Fractal Monopolar Antenna for 3.4 - 3.6 GHz Wi-Max Band Portable Devices. UNSPECIFIED. (Submitted)
http://eprints.biblio.unitn.it/892/
oai:eprints.biblio.unitn.it:946
2012-02-28T14:18:54Z
7374617475733D756E707562
7375626A656374733D51:5141:5141313530
7375626A656374733D51:5143:5143303230
74797065733D746563687265706F7274
On time observables in thermal theories
Pinamonti, Nicola
QA152 Algebra
QC020 Mathematical Physics
Available in the .pdf file
2006-01
Departmental Technical Report
NonPeerReviewed
application/pdf
http://eprints.biblio.unitn.it/946/1/UTM691.pdf
Pinamonti, Nicola (2006) On time observables in thermal theories. UNSPECIFIED. (Unpublished)
http://eprints.biblio.unitn.it/946/
oai:eprints.biblio.unitn.it:1018
2012-02-28T14:19:10Z
7374617475733D756E707562
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74797065733D746563687265706F7274
Lorenz gauged vector potential formulations for the time-harmonic eddy-current problem with L∞-regularity of material properties
Fernandes, Paolo
Valli, Alberto
QC020 Mathematical Physics
In this paper we consider some Lorenz gauged vector potential formulations of the eddy-current problem for the time-harmonic Maxwell equations with material properties having only L1-regularity. We prove that there exists a unique solution of these problems, and we show the convergence of a suitable finite element approximation scheme. Moreover, we show that some previously proposed Lorenz gauged formulations are indeed formulations in terms of the modified magnetic vector potential, for which the electric scalar potential is vanishing.
2006-06
Departmental Technical Report
NonPeerReviewed
application/pdf
http://eprints.biblio.unitn.it/1018/1/UTM697.pdf
Fernandes, Paolo and Valli, Alberto (2006) Lorenz gauged vector potential formulations for the time-harmonic eddy-current problem with L∞-regularity of material properties. UNSPECIFIED. (Unpublished)
http://eprints.biblio.unitn.it/1018/
oai:eprints.biblio.unitn.it:1037
2012-02-28T14:19:13Z
7374617475733D756E707562
7375626A656374733D51:5143:5143373630
74797065733D746563687265706F7274
Well posedness results for a class of partial differential equations with hysteresis arising in electromagnetism
Eleuteri, Michela
QC760 Electromagnetism
We consider an evolutionary P.D.E. motivated by models for electromagnetic processes in ferromagnetic materials. Magnetic hysteresis is represented by means of a hysteresis operator. Under suitable assumptions, an existence and uniqueness theorem is obtained, together with the Lipschitz continuous dependence on the data and some further regularity results. The discussion of the behaviour of the solution in dependence on physical parameters of the problem is also outlined.
2006-07
Departmental Technical Report
NonPeerReviewed
application/pdf
http://eprints.biblio.unitn.it/1037/1/UTM700.pdf
Eleuteri, Michela (2006) Well posedness results for a class of partial differential equations with hysteresis arising in electromagnetism. UNSPECIFIED. (Unpublished)
http://eprints.biblio.unitn.it/1037/
oai:eprints.biblio.unitn.it:1045
2012-02-28T14:19:15Z
7374617475733D7375626D6974746564
7375626A656374733D51:5143:5143373630
74797065733D746865736973
Bio-Medical Sensing using Ultra Wideband Communications and Radar Technology
Bilich, Carlos
QC760 Electromagnetism
The aim of this work is to study the application of Ultra Wideband (UWB) technology to perform biomedical sensing and vital signs monitoring in humans. Among the numerous signals that can be measured, the heart rate (HR) is chosen as the first objective due to its importance. The research is pointed towards the development of a technique that can allow both, radar sensing and communications using the same UWB transceiver. Such a sensor, could use UWB radar principles to measure the heart beat rate and UWB communication standards to transmit these measurements. Readily available commercial transceivers with minor adaptations will be considered as possible to solve for the physical layer. Signal processing for target detection will be done at higher levels. Having sensors with such “duo” properties can make them ideal nodes for wearable computing, as well as sensor and body area networks.
2006-01
Thesis
PeerReviewed
application/pdf
http://eprints.biblio.unitn.it/1045/1/3_PhD_Proposal_Copertina.pdf
Bilich, Carlos (2006) Bio-Medical Sensing using Ultra Wideband Communications and Radar Technology. UNSPECIFIED thesis, UNSPECIFIED.
http://eprints.biblio.unitn.it/1045/
oai:eprints.biblio.unitn.it:1049
2012-02-28T14:19:16Z
7374617475733D756E707562
7375626A656374733D51:5143:5143373630
74797065733D746563687265706F7274
UWB radars for Bio-Medical Sensing: Attenuation Model for Wave Propagation in the Body at 4GHz
Bilich, Carlos
QC760 Electromagnetism
The aim of this work is to compute the attenuation that an electromagnetic wave will suffer when traversing the human body. The frequency under consideration is 4GHz, but a calculation in 1.5GHz is also provided to contrast this formulation against the results of the literature. The calculation is done considering a uniform plane wave normally incident upon the skin, which traverses the chest, reach the heart and bounces back.
2006-07
Departmental Technical Report
NonPeerReviewed
application/pdf
http://eprints.biblio.unitn.it/1049/1/TechRep_UWB_AttModel.pdf
Bilich, Carlos (2006) UWB radars for Bio-Medical Sensing: Attenuation Model for Wave Propagation in the Body at 4GHz. UNSPECIFIED. (Unpublished)
http://eprints.biblio.unitn.it/1049/
oai:eprints.biblio.unitn.it:1065
2012-02-28T14:19:20Z
7374617475733D707562
7375626A656374733D51:5143:5143333530
74797065733D746563687265706F7274
Optical Packet Switching With Photonic Crystals: An Overview
Bilich, Carlos
QC350 Optics. Light
All optical packet switching arises as the last research frontier of optical networking. It is desirable because of several reasons being the most important the necessity to eliminate the bottleneck that constitutes electro-optical conversion. Having all optical packet switching networks without electro-optical conversion is the way to go to provide the astonishing amounts of bandwidth requirements needed for a future network that will link people, places and objects. So far, somehow “traditional techniques” based on per-packet wavelength routing, deflection routing, optical burst switching, etc., have been proposed without much commercial success. Aside for these approaches based on smart architectures, there are others based on novel devices like molecular electronics and photonic bandgap materials among others. Of particular interest among bandgap periodic structures, are photonic crystals. This article describes their properties and how they can be used to build a photonic packet switch.
2005-06
Departmental Technical Report
PeerReviewed
application/pdf
http://eprints.biblio.unitn.it/1065/1/OPS_PhotonicCrystals_Bilich.pdf
Bilich, Carlos (2005) Optical Packet Switching With Photonic Crystals: An Overview. UNSPECIFIED.
http://eprints.biblio.unitn.it/1065/
oai:eprints.biblio.unitn.it:1080
2012-02-28T14:19:23Z
7374617475733D756E707562
7375626A656374733D51:5143:5143303230
74797065733D746563687265706F7274
Quantum ground states holographically induced by asymptotic flatness: Invariance under spacetime symmetries, energy positivity and Hadamard property.
Moretti, Valter
QC020 Mathematical Physics
This paper continues the analysis of the quantum states introduced in previous works and determined by the universal asymptotic structure of four-dimensional asymptotically flat vacuum spacetimes at null infinity M. It is now focused on the quantum state λM, of a conformally coupled scalar field propagating in M. λM is "holographically" induced in the bulk by the universal BMS-invariant state λ at infinity J+ of M. It is done by means of the correspondence between observables in the bulk and those on the boundary at null infinity discussed in previous papers. This induction is possible when some requirements are fulfilled. This happens in particular whenever the spacetime M and the associated unphysical one, ~M , are globally hyperbolic and M admits future infinity i+. As is known λM coincides with Minkowski vacuum if M is Minkowski spacetime. It is now proved that, in the general case, λM enjoys the following further remarkable properties. (i) λM is invariant under the (unit component of the Lie) group of isometries of the bulk spacetime M. (ii) λM fulfills a natural energy-positivity condition with respect to every notion of Killing time (if any) in the bulk spacetime M: If M admits a complete time-like Killing vector, the associated one-parameter group of isometries is represented by a strongly-continuous unitary group in the GNS representation of λM. The unitary group has positive self-adjoint generator without zero modes in the one- particle space. (iii) λM is (globally) Hadamard and thus it can be used as starting point for perturbative renormalization procedure.
2006-10
Departmental Technical Report
PeerReviewed
application/pdf
http://eprints.biblio.unitn.it/1080/1/UTM704.pdf
Moretti, Valter (2006) Quantum ground states holographically induced by asymptotic flatness: Invariance under spacetime symmetries, energy positivity and Hadamard property. UNSPECIFIED. (Unpublished)
http://eprints.biblio.unitn.it/1080/
oai:eprints.biblio.unitn.it:1094
2012-02-28T14:19:27Z
7374617475733D696E7072657373
7375626A656374733D51:5143:5143363631
7375626A656374733D51:5143:5143353031
7375626A656374733D54:544B:544B353130352E35
7375626A656374733D51:5141:51413735
7375626A656374733D51:5143:5143373630
7375626A656374733D51:5143:5143303230
7375626A656374733D51:5143:51433130302E35
74797065733D746563687265706F7274
Synthesis of a Three-Dimensional Triband (L1-L2 GPS and Wi-Fi) Prefractal Tree Antenna
Azaro, Renzo
Zeni, Edoardo
Gazzini, Tommaso
Dallapiccola, Ramona
Massa, Andrea
QC661 Electromagnetic Theory
TK5105.5 Computer Networks
QC501 Electricity
QC760 Electromagnetism
QA075 Electronic computers. Computer science
QC020 Mathematical Physics
QC100.5 Measuring Instruments
In this letter, the synthesis of a 3D wire antenna with a tree-like shape and operating at three different frequency bands (L1-L2 GPS bands and Wi-Fi) is presented. The Geometrical parameters of the antenna are determined by means of a particle swarm-based optimization procedure exploiting the degrees of freedom of the reference tree geometry for fitting the electrical project costraints. The results of the numerical simulation are shown and compared with those for experimental measurements for assessing the effectiveness of the synthesis procedure.
2006-11
Departmental Technical Report
PeerReviewed
application/pdf
http://eprints.biblio.unitn.it/1094/1/DIT%2D06%2D068.pdf
Azaro, Renzo and Zeni, Edoardo and Gazzini, Tommaso and Dallapiccola, Ramona and Massa, Andrea (2006) Synthesis of a Three-Dimensional Triband (L1-L2 GPS and Wi-Fi) Prefractal Tree Antenna. UNSPECIFIED. (In Press)
http://eprints.biblio.unitn.it/1094/
oai:eprints.biblio.unitn.it:1187
2012-02-28T14:19:57Z
7374617475733D756E707562
7375626A656374733D51:5143:5143303230
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Quantum Field Theories in Curved Spacetime
Brunetti, Romeo
Moretti, Valter
QC020 Mathematical Physics
Not available. - Invited contribution to the Modern Encyclopedia of Mathematical Physics (by Springer). Topical Article in the section Quantum Field Theory. QFT on Manifolds and in External Fields.
2007-03
Departmental Technical Report
NonPeerReviewed
application/pdf
http://eprints.biblio.unitn.it/1187/1/UTM712.pdf
Brunetti, Romeo and Moretti, Valter (2007) Quantum Field Theories in Curved Spacetime. UNSPECIFIED. (Unpublished)
http://eprints.biblio.unitn.it/1187/
oai:eprints.biblio.unitn.it:1224
2012-02-28T14:20:10Z
7374617475733D756E707562
7375626A656374733D51:5143:5143373630
74797065733D746563687265706F7274
Object-Oriented Model of SDR Library for WiMAX/UMTS System Baseband Level
Zlydareva, Olga
Sacchi, Claudio
QC760 Electromagnetism
Emerging standards in the area of mobile services, such as Worldwide Interoperability for Microwave Access (WiMAX) and Universal Mobile Telecommunication System (UMTS), require new capabilities from mobile devices. As a result, these devices should be aware of how to download and correctly install particular software. For this purpose, the Software Defined Radio (SDR) technology is used at present. SDR allows the co-existence of different independent standards, protocols, and services. This signal processing approach is broadly spreading because of the reprogramming and reconfiguring of mobile devices is of great importance. Due to the availability of SDR in the device architecture, a user can update and replace necessary services without changing the hardware. In this paper the object-oriented framework of model for SDR implementation are presented. The main accent was made on possibility to co-exist two types of standards and to describe it by high-level language software, which allows to simulate the complex systems. The base construction of proposed model was built. Furthermore this model shows that the SDR technique can be acceptable for the co-existence of WiMAX and UMTS structure independently from the physical layer.
2007
Departmental Technical Report
NonPeerReviewed
application/pdf
http://eprints.biblio.unitn.it/1224/1/OBJECTORIENTED_MODEL_OF_SDR_LIBRARY_FOR_WIMAXUMTS_SYSTEM_BASEBAND_LEVEL.pdf
Zlydareva, Olga and Sacchi, Claudio (2007) Object-Oriented Model of SDR Library for WiMAX/UMTS System Baseband Level. UNSPECIFIED. (Unpublished)
http://eprints.biblio.unitn.it/1224/
oai:eprints.biblio.unitn.it:1225
2012-02-28T14:20:10Z
7374617475733D756E707562
7375626A656374733D51:5143:5143373630
74797065733D746563687265706F7274
Reconfiguration and Reprogramming of the Baseband Level by Software Defined Radio for WiMAX and UMTS Multi-Standards Terminals
Zlydareva, Olga
QC760 Electromagnetism
Emerging standards in the area of mobile services, such as Worldwide Interoperability for Microwave Access (WiMAX) and Universal Mobile Telecommunication System (UMTS), require new capabilities from mobile devices. As a result, these devices should be aware of how to download and correctly install particular software. For this purpose, the Software Define Radio (SDR) technology is used at present. SDR allows co-existence of different independent standards, protocols, and services. This signal processing approach is broadly spreading given that reprogramming and reconfiguring of mobile devices is of great importance. Due to the availability of SDR in the device architecture, a user can update and replace necessary services without changing the hardware. This work presents a new approach to adaptation of WiMAX and UMTS to the mobile terminals on the basis of SDR. We propose the original implementation of the signal processing phase which will be able to dynamically support incoming signals of different standards.
2007
Departmental Technical Report
NonPeerReviewed
application/pdf
http://eprints.biblio.unitn.it/1225/1/Reconfiguration_and_reprogramming_of_the_baseband_level_by_Software_Defined_Radio_for_WiMAX_and_UMTS_multi%2Dstandards_terminals.pdf
Zlydareva, Olga (2007) Reconfiguration and Reprogramming of the Baseband Level by Software Defined Radio for WiMAX and UMTS Multi-Standards Terminals. UNSPECIFIED. (Unpublished)
http://eprints.biblio.unitn.it/1225/
oai:eprints.biblio.unitn.it:1235
2012-02-28T14:20:17Z
7374617475733D7375626D6974746564
7375626A656374733D51:5143:5143363631
7375626A656374733D51:5143:5143373630
74797065733D746563687265706F7274
A quad-band patch antenna for Galileo and Wi-Max services
Zeni, Edoardo
Azaro, Renzo
Rocca, Paolo
Massa, Andrea
QC661 Electromagnetic Theory
QC760 Electromagnetism
The design of a patch antenna working in E5 - L1 Galileo, 2.5 GHz and 3.5 GHz bands is discussed. Starting from a classical rectangular patch antenna with four resonant modes located around the required spectrum regions, the tuning of the operating frequencies is obtained by perturbing the perimeter of the antenna shape according to a pre-fractal Koch-like erosion process. In order to show the effectiveness and reliability of the synthesized structure, a selected set of numerical and experimental results are reported and discussed.
2007
Departmental Technical Report
NonPeerReviewed
application/pdf
http://eprints.biblio.unitn.it/1235/1/DIT%2D07%2D047.pdf
Zeni, Edoardo and Azaro, Renzo and Rocca, Paolo and Massa, Andrea (2007) A quad-band patch antenna for Galileo and Wi-Max services. UNSPECIFIED. (Submitted)
http://eprints.biblio.unitn.it/1235/
oai:eprints.biblio.unitn.it:1257
2012-02-28T14:20:24Z
7374617475733D696E7072657373
7375626A656374733D51:5143:5143363631
7375626A656374733D54:544B:544B37383835
74797065733D746563687265706F7274
Memory Enhanced PSO-Based Optimization Approach for Smart Antennas Control in Complex Interference Scenario
Benedetti, Manuel
Azaro, Renzo
Massa, Andrea
TK7885 Computer Engineering
QC661 Electromagnetic Theory
In the framework of control methods for adaptive phased-arrays, this paper deals with complex communication scenarios by considering a memory-enhanced cooperative algorithm. Compared to existing approaches where far-field interferences are taken into account, the proposed analysis considers a more realistic situation where the jamming sources are located either in the near-field or in the far-field of the receiving antenna. In order to carefully address the arising challenges and to effectively deal with such complex environments, an optimization approach based on an enhanced PSO-based algorithm is used. The obtained results seem to confirm the effectiveness of the proposed technique in terms of both signal-to-noise ratio and computational costs and complexity.
2007-08
Departmental Technical Report
NonPeerReviewed
application/pdf
http://eprints.biblio.unitn.it/1257/1/DIT%2D07%2D051.pdf
Benedetti, Manuel and Azaro, Renzo and Massa, Andrea (2007) Memory Enhanced PSO-Based Optimization Approach for Smart Antennas Control in Complex Interference Scenario. UNSPECIFIED. (In Press)
http://eprints.biblio.unitn.it/1257/
oai:eprints.biblio.unitn.it:1278
2012-02-28T14:20:27Z
7374617475733D7375626D6974746564
7375626A656374733D54:544B
7375626A656374733D51:5143:5143373630
74797065733D746563687265706F7274
A GSM signals based positioning technique for mobile applications
Azaro, Renzo
Donelli, Massimo
Benedetti, Manuel
Rocca, Paolo
Massa, Andrea
TK Electrical engineering. Electronics Nuclear engineering
QC760 Electromagnetism
A mobile positioning system based on GSM signals analysis and on a cooperative stochastic optimization algorithm is presented. The proposed technique is intended as a backup solution in those applicative scenarios where the GPS system fails to work (e.g., urban canyons). The hardware architecture of the system and the positioning algorithm are described and validated by means of a numerical assessment.
2007-10
Departmental Technical Report
PeerReviewed
application/pdf
http://eprints.biblio.unitn.it/1278/1/DIT%2D07%2D052.pdf
Azaro, Renzo and Donelli, Massimo and Benedetti, Manuel and Rocca, Paolo and Massa, Andrea (2007) A GSM signals based positioning technique for mobile applications. UNSPECIFIED. (Submitted)
http://eprints.biblio.unitn.it/1278/
oai:eprints.biblio.unitn.it:1309
2012-02-28T14:20:42Z
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Aggregation of regional economic time series with different spatial correlation structures
Arbia, Giuseppe
Bee, Marco
Espa, Giuseppe
QC020 Mathematical Physics
In this paper we compare the relative efficiency of different forecasting methods of space-time series when variables are spatially and temporally correlated. We consider the case of a space-time series aggregated into a single time series and the more general instance of a space-time series aggregated into a coarser spatial partition. We extend in various directions the outcomes found in the literature by including the consideration of larger datasets and the treatment of edge effects and of negative spatial correlation. The outcomes obtained provide operational suggestions on how to choose between alternative forecasting methods in empirical circumstances.
2007
Departmental Technical Report
NonPeerReviewed
application/pdf
http://eprints.biblio.unitn.it/1309/1/20_07_arbia.pdf
Arbia, Giuseppe and Bee, Marco and Espa, Giuseppe (2007) Aggregation of regional economic time series with different spatial correlation structures. UNSPECIFIED.
http://eprints.biblio.unitn.it/1309/
oai:eprints.biblio.unitn.it:1402
2012-02-28T14:21:35Z
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Morphological Processing of Electromagnetic Scattering Data for Enhancing the Reconstruction Accuracy of the Iterative Multi-Scaling Approach
Franceschini, Davide
Rosani, Andrea
Donelli, Massimo
Pastorino, Matteo
Massa, Andrea
TK7885 Computer Engineering
QC661 Electromagnetic Theory
T055.4 Industrial Engineering
QC760 Electromagnetism
TA329 Engineering mathematics
This work is aimed at presenting a methodology that exploits the scattered electromagnetic radiation collected on a measurement region outside the area under investigation to locate and characterize multiple unknown profiles. In many practical cases, an accurate quantitative imaging of the scenario under test is required and it can be reached by using a high resolution representation of the dielectric profile of the scatterers. Towards this aim, an enhanced iterative multi-resolution procedure that exploits a morphological processing for detecting and focusing on different non-connected regions-of-interest is developed. A suitable set of representative numerical results is presented for demonstrating that the proposed approach is able to efficiently detect the objects located in the test domain and to enhance the accuracy in reconstructing multiple scatterers
2008-03
Departmental Technical Report
NonPeerReviewed
application/pdf
http://eprints.biblio.unitn.it/1402/1/DISI%2D08%2D016.pdf
Franceschini, Davide and Rosani, Andrea and Donelli, Massimo and Pastorino, Matteo and Massa, Andrea (2008) Morphological Processing of Electromagnetic Scattering Data for Enhancing the Reconstruction Accuracy of the Iterative Multi-Scaling Approach. UNSPECIFIED. (In Press)
http://eprints.biblio.unitn.it/1402/
oai:eprints.biblio.unitn.it:1403
2012-02-28T14:21:36Z
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A hybrid prefractal three-band antenna for multistandard mobile wireless applications
Azaro, Renzo
Debiasi, Luca
Zeni, Edoardo
Benedetti, Manuel
Rocca, Paolo
Massa, Andrea
TS Manufactures
QC760 Electromagnetism
QA076 Computer software
TK7885 Computer Engineering
QC661 Electromagnetic Theory
QC501 Electricity
QA075 Electronic computers. Computer science
T055.4 Industrial Engineering
TA329 Engineering mathematics
QA063 Problem solving
QC020 Mathematical Physics
In this letter, the synthesis of a miniaturized threeband planar antenna working in GSM and WiFi frequency bands is described. The reference geometry for the synthesis of the antenna is a hybrid prefractal shape obtained by integrating a Sierpinski-like and a Meander-like structure. The synthesis of the geometrical parameters of the antenna has been performed by means of a customized Particle Swarm strategy to yield electrical parameters within given specifications. In order to show the effectiveness of the approach, some results from the numerical synthesis procedure are described and a comparison between simulations and experimental measurements is reported.
2008-03
Departmental Technical Report
NonPeerReviewed
application/pdf
http://eprints.biblio.unitn.it/1403/1/DISI%2D08%2D015.pdf
Azaro, Renzo and Debiasi, Luca and Zeni, Edoardo and Benedetti, Manuel and Rocca, Paolo and Massa, Andrea (2008) A hybrid prefractal three-band antenna for multistandard mobile wireless applications. UNSPECIFIED. (Submitted)
http://eprints.biblio.unitn.it/1403/
oai:eprints.biblio.unitn.it:1432
2012-02-28T14:21:46Z
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Some Indications on the Analytic Expression of Non-Radiating Currents in 2D TM Imaging Problems
Rocca, Paolo
Donelli, Massimo
Gragnani, Gian Luigi
Massa, Andrea
TK7885 Computer Engineering
QC661 Electromagnetic Theory
QC760 Electromagnetism
In this contribution, an analytical procedure for building the non-radiating part of the equivalent current in inverse scattering problems is presented. The mathematical formulation, concerned with a 2D configuration and TM illumination, is provided and discussed.
2008-05
Departmental Technical Report
NonPeerReviewed
application/pdf
http://eprints.biblio.unitn.it/1432/1/DISI%2D08%2D018.pdf
Rocca, Paolo and Donelli, Massimo and Gragnani, Gian Luigi and Massa, Andrea (2008) Some Indications on the Analytic Expression of Non-Radiating Currents in 2D TM Imaging Problems. UNSPECIFIED. (Unpublished)
http://eprints.biblio.unitn.it/1432/
oai:eprints.biblio.unitn.it:1443
2012-02-28T14:21:51Z
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A formulation of the eddy-current problem in the presence of electric ports
Alonso Rodriguez, Ana
Valli, Alberto
Vazquez Hernandez, Rafael
QC501 Electricity
The time-harmonic eddy current problem with either voltage or current intensity excitation is considered. We propose and analyze a new finite element approximation of the problem, based on a weak formulation where the main unknowns are the electric field in the conductor, a scalar magnetic potential in the insulator and, for the voltage excitation problem, the current intensity. The finite element approximation uses edge elements for the electric field and nodal elements for the scalar magnetic potential, and an optimal error estimate is proved. Some numerical results illustrating the performance of the method are also presented.
2008-04
Departmental Technical Report
NonPeerReviewed
application/pdf
http://eprints.biblio.unitn.it/1443/1/UTM720.pdf
Alonso Rodriguez, Ana and Valli, Alberto and Vazquez Hernandez, Rafael (2008) A formulation of the eddy-current problem in the presence of electric ports. UNSPECIFIED. (Unpublished)
http://eprints.biblio.unitn.it/1443/
oai:eprints.biblio.unitn.it:1444
2012-02-28T14:21:51Z
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Iterative methods for the saddle-point problem arising from the HC /EI formulation of the eddy current problem
Alonso Rodriguez, Ana
Vazquez Hernandez, Rafael
QC760 Electromagnetism
This paper is concerned with the resolution of the linear system arising from a finite element approximation of the time-harmonic eddy current problem. We consider the HC/EI formulation introduced and analyzed in [2], where an optimal error estimate for the finite element approximation using edge elements of the first order is proved. We reduce the linear system by eliminating the Lagrange multiplier introduced in the insulator region. Two different iterative procedures are proposed: a modified SOR method and an Uzawa-like method. The finite element scheme has been implemented in Matlab and the two iterative procedures have been compared by solving four different test problems.
2008-04
Departmental Technical Report
NonPeerReviewed
application/pdf
http://eprints.biblio.unitn.it/1444/1/UTM723.pdf
Alonso Rodriguez, Ana and Vazquez Hernandez, Rafael (2008) Iterative methods for the saddle-point problem arising from the HC /EI formulation of the eddy current problem. UNSPECIFIED. (Unpublished)
http://eprints.biblio.unitn.it/1444/
oai:eprints.biblio.unitn.it:1493
2012-02-28T14:22:06Z
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SVM-based Classification Approach for Synthetic-Impulse Microwave Imaging
Viani, Federico
Benedetti, Manuel
Donelli, Massimo
Lizzi, Leonardo
Cresp, A.
Aliferis, L.
Pichot, Christian
Massa, Andrea
QC760 Electromagnetism
QC661 Electromagnetic Theory
TK7885 Computer Engineering
TA350 Applied Mechanics
QA075 Electronic computers. Computer science
QA063 Problem solving
QC020 Mathematical Physics
TA329 Engineering mathematics
Surface-Penetratic Radar (SPR) is aimed at providing an image of the objects buried in an inaccessible host medium. Such a scenario generally occurs in many applications, ranging from to the search of objects in the subsoil [Schubert 2001] to through-wall imaging (TWI)[Ferries 1998]. In order to effectively reconstruct an accurate image of the investigation area, many methodologies based on x-rays, ultrasonics, eddy currents, or microwaves have been investigated. In such a framework, microwave imaging techniques are very promising since electromagnetic fields at centimeter wavelenghts can penetrate non-ideal conductor materials and are usually low power and relatively inexpensive. Recently, thanks to the development of effective ultrawideband (UWB) hardware, wideband microwave imaging systems have been proposed. Compared to single-frequency approaches, such systems allow to collect a wider amount of information, since the scattered field can be measured at different frequencies in the working bandwidth and/or in the time-domain. In order to take advantage of multi-frequency data, signal processing plays a key role. Different techniques combining pre-processing treatments and microwave imaging are currently used to construct an image of a scene [Daniels 2004]. In addition, time-reversal (TR) data processing has been recently employed in order to detect positions of the targets in a Synthetic-Impulse Microwave Imaging System (SIMIS) [Cresp 2008]. In such a framework and within the GALILEO 2008 project, the research units, ELEDIA @ Univ. Trento and LEAT @ Univ. Nice, are currently involved in the integration of a SVM-based classification approach in the SIMIS for the reconstruction of the position and the shape of targets. Such a report is focused on the description of problem geometry as well as of the specification of the SIMIS.
2008-04
Departmental Technical Report
NonPeerReviewed
application/pdf
http://eprints.biblio.unitn.it/1493/1/DISI%2D08%2D047.pdf
Viani, Federico and Benedetti, Manuel and Donelli, Massimo and Lizzi, Leonardo and Cresp, A. and Aliferis, L. and Pichot, Christian and Massa, Andrea (2008) SVM-based Classification Approach for Synthetic-Impulse Microwave Imaging. UNSPECIFIED. (Unpublished)
http://eprints.biblio.unitn.it/1493/
oai:eprints.biblio.unitn.it:1523
2012-02-28T14:22:15Z
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Microwave Imaging from Amplitude-Only Data–Advantages and Open Problems of a Two-Step Multi-resolution Strategy
Massa, Andrea
ELEDIALab,
QC661 Electromagnetic Theory
TK5105.5 Computer Networks
T055.4 Industrial Engineering
QC760 Electromagnetism
In this report, a two step strategy for the inversion of amplitude-only data in microwave imaging applications is analyzed. At the first step of the proposed method, the illuminating source is synthesized according to a line sources model in order to compute the incident field in the investigation domain starting from the values available in the measurement domain. The second step is aimed at reconstructing the profile of the objects under test thanks to the iterative multi-scaling approach integrated with the Particle Swarm Optimizer, an effective evolutionary minimization technique. The reconstruction accuracy of the proposed phaseless retrieval strategy is analyzed using synthetic data concerned with a multiple scatterer configuration and successively further assessed inverting experimental data
2008-11
Departmental Technical Report
NonPeerReviewed
application/pdf
http://eprints.biblio.unitn.it/1523/1/DISI%2D08%2D073.pdf
Massa, Andrea and ELEDIALab, (2008) Microwave Imaging from Amplitude-Only Data–Advantages and Open Problems of a Two-Step Multi-resolution Strategy. UNSPECIFIED. (Unpublished)
http://eprints.biblio.unitn.it/1523/
oai:eprints.biblio.unitn.it:1536
2012-02-28T14:22:21Z
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Rapporto tecnico n. 4: studio ed implementazione di un modello elettromagnetico per analisi di copertura UMTS (Modello Gandini Riuscitti): DIT-PRJ-08-034
Massa, Andrea
ELEDIALab,
TK7885 Computer Engineering
TK5105.5 Computer Networks
QC760 Electromagnetism
not available.
2008-12
Departmental Technical Report
NonPeerReviewed
application/pdf
http://eprints.biblio.unitn.it/1536/1/DISI%2D08%2D086.pdf
Massa, Andrea and ELEDIALab, (2008) Rapporto tecnico n. 4: studio ed implementazione di un modello elettromagnetico per analisi di copertura UMTS (Modello Gandini Riuscitti): DIT-PRJ-08-034. UNSPECIFIED. (Unpublished)
http://eprints.biblio.unitn.it/1536/
oai:eprints.biblio.unitn.it:1551
2012-02-28T14:22:27Z
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Topological features of massive bosons on two dimensional Einstein space-time. I: Spatial approach
Brunetti, Romeo
Franceschini, Lorenzo
Moretti, Valter
QC020 Mathematical Physics
In this paper we tackle the problem of constructing explicit examples of topological cocycles of Robert's net cohomology, as defined abstractly by Brunetti and Ruzzi. We consider the simple case of massive bosonic quantum field theory on the two dimensional Einstein cylinder. After deriving some crucial results of the algebraic framework of quantization, we address the problem of the construction of the topological cocycles. All constructed cocycles lead to unitarily equivalent representations of the fundamental group of the circle (seen as a diffeomorphic image of all possible Cauchy surfaces). The construction is carried out using only Cauchy data and related net of local algebras on the circle. A space-time approach is considered in a forthcoming paper.
2008-12
Departmental Technical Report
NonPeerReviewed
application/pdf
http://eprints.biblio.unitn.it/1551/1/UTM725.pdf
Brunetti, Romeo and Franceschini, Lorenzo and Moretti, Valter (2008) Topological features of massive bosons on two dimensional Einstein space-time. I: Spatial approach. UNSPECIFIED. (Unpublished)
http://eprints.biblio.unitn.it/1551/
oai:eprints.biblio.unitn.it:1873
2012-02-28T14:24:17Z
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The Hodge decomposition theorem for general three-dimensional vector fields, without cuts
Ghiloni, Riccardo
QC760 Electromagnetism
QA611 Topology
Preprint. The Hodge decomposition of the space $L^2(\Omega)^3$ of square sommable vector fields defined on a domain $\Omega$ of the ordinary three–dimensional space is a tool used in a wide theoretic and applied literature concerning Electromagnetism and Fluid dynamics. In order to obtain an effective Hodge decomposition, suitable also for numerical computations, the classical strategy, which goes back to Helmholtz and which is used nowadays as well, is to consider only bounded domains with sufficiently regular boundary, which contain connected and pairwise disjoint surfaces, called cut surfaces of $\Omega$, whose complement $C$ in $\Omega$ is simply connected. The advantage of this situation is that the union of such cut surfaces does not have singularities, every curl–free vector field in $\Omega$ admits potential in $C$ and hence it is possible to apply standard variational methods to obtain the Hodge decomposition via scalar potential formulations. Recently, R. Benedetti, R. Frigerio and the author gave an exhaustive topological description of bounded domains, called Helmholtz domains, which admit such cut surfaces. We proved that the Helmholtz domains are truly special three–dimensional domains. In fact, their topology is elementary. An evidence of this claim is given, for example, by the fact that the complement of any non-trivial thickened knot in a box domain is not a Helmholtz domain. In this way, we realize that the range of application of the classical strategy is quite limited. In this paper, we announce several results concerning an effective Hodge decomposition of $L^2(\Omega)^3$ valid for every bounded domain $\Omega$ with Lipschitz–regular boundary, where $\Omega$ describes a spatial medium formed by a possible inhomogeneous and/or anisotropic material.
2010-07
Departmental Technical Report
NonPeerReviewed
application/pdf
http://eprints.biblio.unitn.it/1873/1/UTM_731.pdf
Ghiloni, Riccardo (2010) The Hodge decomposition theorem for general three-dimensional vector fields, without cuts. UNSPECIFIED. (Unpublished)
http://eprints.biblio.unitn.it/1873/
oai:eprints.biblio.unitn.it:1901
2012-02-28T14:24:23Z
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Local z-functions, stress-energy tensor, field fluctuations, and all that, in curved static spacetime
Moretti, Valter
QC020 Mathematical Physics
This is a quick review on some technology concerning the local zeta function applied to Quantum Field Theory in curved static (thermal) spacetime to regularize the stress energy tensor and the field fluctuations.
2010-10
Departmental Technical Report
NonPeerReviewed
application/pdf
http://eprints.biblio.unitn.it/1901/1/UTM_739.pdf
Moretti, Valter (2010) Local z-functions, stress-energy tensor, field fluctuations, and all that, in curved static spacetime. UNSPECIFIED. (Unpublished)
http://eprints.biblio.unitn.it/1901/
oai:eprints.biblio.unitn.it:1979
2012-02-28T14:24:54Z
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A New Methodology Based on an Iterative Multi-scaling for Microwave Imaging
Caorsi, Salvatore
Donelli, Massimo
Franceschini, Davide
Massa, Andrea
QC661 Electromagnetic Theory
TK Electrical engineering. Electronics Nuclear engineering
QC760 Electromagnetism
In this work the problem of the localization, shaping and dielectric permittivity reconstruction of dielectric targets is addressed. The scatterers under test are inhomogeneous cylinders of arbitrary cross sections probed by a set of incident electromagnetic fields of TM type. The scattered field data are processed in order to locate and roughly recover the objects'shapes. Then the scatterers under test are reconstructed with an increasing accuracy by means of an iterative multi-scaling procedure until stationary reconstructions are ahieved. The proposed method is presented jointly with a modified conjugate-gradient inversion procedure in order to minimize the arising cost function. Howewer, this methodology is independent from the minimization algorithm and other and more efficient algorithms can be used. In order to assess the effectiveness of the iterative multi-scaling method, the results of several test cases (with and without noise) are presented and discussed in more detail. (c) 2003 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other users, including reprinting/ republishing this material for advertising or promotional purposes, creating new collective works for resale or redistribution to servers or lists, or reuse of any copyrighted components of this work in other works.
2003-04
Departmental Technical Report
PeerReviewed
application/pdf
http://eprints.biblio.unitn.it/1979/1/DISI%2D11%2D007.pdf
Caorsi, Salvatore and Donelli, Massimo and Franceschini, Davide and Massa, Andrea (2003) A New Methodology Based on an Iterative Multi-scaling for Microwave Imaging. UNSPECIFIED.
http://eprints.biblio.unitn.it/1979/
oai:eprints.biblio.unitn.it:1980
2012-02-28T14:24:56Z
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An Innovative Computational Approach Based on a Particle Warm Strategy for Adaptive Phased-Arrays Control
Donelli, Massimo
Azaro, Renzo
De Natale, Francesco
Massa, Andrea
TK7885 Computer Engineering
QC760 Electromagnetism
In this paper a new approach to the control of phased arrays is presented and assessed. Starting from the adaptive array theory, a particle swarm strategy is used to tune the phase coefficients of the array in order to adaptively minimize/avoid the effects of interfering signals at the receiver. To show the effectiveness of the proposed approach, a selected set of numerical examples, concerned with linear as well as planar arrays, is presented. Furthermore, to evaluate the advantages of the PSO-based strategy over state-of-art methods, a comparative study is carried out by analyzing the performance of the method in terms of both the signal-to-interference-plus-noise-ratio and resulting beam pattern. The achieved results, even though preliminarly, seem to confirm that the PSO-based approach satisfactorily works and it generally outperforms previously proposed/state-of-art phase-only adaptive control strategies. (c) 2006 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other users, including reprinting/ republishing this material for advertising or promotional purposes, creating new collective works for resale or redistribution to servers or lists, or reuse of any copyrighted components of this work in other works.
2006-03
Departmental Technical Report
PeerReviewed
application/pdf
http://eprints.biblio.unitn.it/1980/1/DISI%2D11%2D008.pdf
Donelli, Massimo and Azaro, Renzo and De Natale, Francesco and Massa, Andrea (2006) An Innovative Computational Approach Based on a Particle Warm Strategy for Adaptive Phased-Arrays Control. UNSPECIFIED.
http://eprints.biblio.unitn.it/1980/
oai:eprints.biblio.unitn.it:1981
2012-02-28T14:24:57Z
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Peak Sidelobe Level Reduction with a Hybrid Approach based on Gas and Difference Sets
Caorsi, Salvatore
Lommi, Andrea
Massa, Andrea
Pastorino, Matteo
TK7885 Computer Engineering
QC661 Electromagnetic Theory
QC760 Electromagnetism
This paper presents an approach for the optimization of the beam pattern produced by massively thinned arrays. The method, which combines the most attractive features of a genetic algorithm and those of a combinatorial technique (namely, the Difference Sets Method), is aimed at synthesizing massively thinned antenna arrays in order to suitably reduce the peak side-lobe level. Selected numerical results are presented in order to assess the effectiveness and reliability of the proposed approach. (c) 2004 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other users, including reprinting/ republishing this material for advertising or promotional purposes, creating new collective works for resale or redistribution to servers or lists, or reuse of any copyrighted components of this work in other works.
2004-04
Departmental Technical Report
PeerReviewed
application/pdf
http://eprints.biblio.unitn.it/1981/1/DISI%2D11%2D009.R57.pdf
Caorsi, Salvatore and Lommi, Andrea and Massa, Andrea and Pastorino, Matteo (2004) Peak Sidelobe Level Reduction with a Hybrid Approach based on Gas and Difference Sets. UNSPECIFIED.
http://eprints.biblio.unitn.it/1981/
oai:eprints.biblio.unitn.it:1982
2012-02-28T14:24:57Z
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A Crack Identification Microwave Procedure based on a Genetic Algorithm for Non-Destructive Testing
Caorsi, Salvatore
Massa, Andrea
Pastorino, Matteo
QC661 Electromagnetic Theory
QC760 Electromagnetism
This paper is aimed at exploring the possibility of using a microwave approach based on a genetic algorithm to detect a defect inside a known host object. Starting from the knowledge of the scattered field, the problem solution is recast as a two step procedure. After defining a cost function depending on the geometry of the defect on the crack detection and reconstruction is investigated. Moreover, the numerical effectiveness of the iterative approach is examinated. (c) 2001 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other users, including reprinting/ republishing this material for advertising or promotional purposes, creating new collective works for resale or redistribution to servers or lists, or reuse of any copyrighted components of this work in other works.
2001-12
Departmental Technical Report
PeerReviewed
application/pdf
http://eprints.biblio.unitn.it/1982/1/DISI%2D11%2D010.pdf
Caorsi, Salvatore and Massa, Andrea and Pastorino, Matteo (2001) A Crack Identification Microwave Procedure based on a Genetic Algorithm for Non-Destructive Testing. UNSPECIFIED.
http://eprints.biblio.unitn.it/1982/
oai:eprints.biblio.unitn.it:1984
2012-02-28T14:24:58Z
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An Innovative Real-Time Technique for Buried Object Detection
Bermani, Emanuela
Boni, Andrea
Caorsi, Salvatore
Massa, Andrea
QC661 Electromagnetic Theory
QC760 Electromagnetism
In this paper, a new on-line inverse scattering methodology is proposed. The original problem is recast into a regression estimation one and successively solved by means of a support vector machine (SVM). Although the approach can be applied to various inverse scattering applications, it results very suitable to deal with the buried object detection. The application of SVMs to the solution of such kind of problems is firstly illustrated. Then, some examples, concerning the localization of a given object from scattered field data acquired at a number of measurement points, are presented. The effectiveness of the SVM method is evaluated also in comparison with classical neural networks (NNs) based approaches. (c) 2003 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other users, including reprinting/ republishing this material for advertising or promotional purposes, creating new collective works for resale or redistribution to servers or lists, or reuse of any copyrighted components of this work in other works.
2003-04
Departmental Technical Report
PeerReviewed
application/pdf
http://eprints.biblio.unitn.it/1984/1/DISI%2D11%2D012.R51.pdf
Bermani, Emanuela and Boni, Andrea and Caorsi, Salvatore and Massa, Andrea (2003) An Innovative Real-Time Technique for Buried Object Detection. UNSPECIFIED.
http://eprints.biblio.unitn.it/1984/
oai:eprints.biblio.unitn.it:1985
2012-02-28T14:24:58Z
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Detection of Buried Inhomogeneous Elliptic Cylinders by a Memetic Algorithm
Caorsi, Salvatore
Massa, Andrea
Pastorino, Matteo
Raffetto, Mirco
Randazzo, Andrea
QC661 Electromagnetic Theory
QC760 Electromagnetism
The application of a global optimization procedure to the detection of buried inhomogeneities is studied in the present paper. The object inhomogeneities are schematized as multilayer infinite dielectric cylinders with elliptic cross sections. An efficient recursive analytical procedure is used for the forward scattering computation. A functional is constructed in which the field is expressed in series solution of Mathieu functions. Starting by the input scattered data, the iterative minimization of the functional is performed by a new optimization method called memetic algorithm. (c) 2003 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other users, including reprinting/ republishing this material for advertising or promotional purposes, creating new collective works for resale or redistribution to servers or lists, or reuse of any copyrighted components of this work in other works.
2003-10
Departmental Technical Report
PeerReviewed
application/pdf
http://eprints.biblio.unitn.it/1985/1/DISI%2D11%2D013.R50.pdf
Caorsi, Salvatore and Massa, Andrea and Pastorino, Matteo and Raffetto, Mirco and Randazzo, Andrea (2003) Detection of Buried Inhomogeneous Elliptic Cylinders by a Memetic Algorithm. UNSPECIFIED.
http://eprints.biblio.unitn.it/1985/
oai:eprints.biblio.unitn.it:1988
2012-02-28T14:24:59Z
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A Fully-Adaptive Smart Antenna Protype: Ideal Model and Experimental Validation in Complex Interference Scenarios
Benedetti, Manuel
Oliveri, Giacomo
Rocca, Paolo
Massa, Andrea
TK7885 Computer Engineering
QC661 Electromagnetic Theory
QC760 Electromagnetism
In this report, the architecture of a smart antenna prototype is described and its functionality assessed. The system prototype is composed by an 8-elements linear arrays of dipoles with a finite reflecting plane and the adaptive behavior is obtained modifying a set of array weights with electronically-driven vector modulators. In order to real-time react to complex interference scenarios, the system is controlled by a software control module based on a Particle Swarm Optimizer. To demonstrate the feasibility and the effectiveness of the proposed implementation, a set of representative results concerned with different interface scenarios is reported and discussed. The final version of this article is available at the url of the journal PIER http://www.jpier.org/PIER/
2009-01
Departmental Technical Report
PeerReviewed
application/pdf
http://eprints.biblio.unitn.it/1988/1/DISI%2D11%2D021.pdf
Benedetti, Manuel and Oliveri, Giacomo and Rocca, Paolo and Massa, Andrea (2009) A Fully-Adaptive Smart Antenna Protype: Ideal Model and Experimental Validation in Complex Interference Scenarios. UNSPECIFIED.
http://eprints.biblio.unitn.it/1988/
oai:eprints.biblio.unitn.it:1989
2012-02-28T14:24:59Z
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Ant Colony Based Hybrid Approach for Optimal Compromise Sum-Difference Patterns Synthesis
Rocca, Paolo
Manica, Luca
Massa, Andrea
TK7885 Computer Engineering
QC661 Electromagnetic Theory
QC760 Electromagnetism
Dealing with the synthesis of monopulse array antennas, many stochastic optimization algorithms have been used for the solution of the so-called optimal compromise problem between sum and difference patterns when sub-arrayed feed networks are considered. More recently, hybrid approaches, exploiting the convexity of the functional with respect to a sub-set of the unknowns (i.e., the sub-array excitation coefficients) have demonstrated their effectiveness. In this letter, an hybrid approach based on the Ant Colony Optimization (ACO) is proposed. At the first step, the ACO is used to define the sub-array membership of the array elements, while, at the second step, the sub-array weights are computed by solving a convex programming problem. The definitive version is available at www3.interscience.wiley.com
2010-01
Departmental Technical Report
PeerReviewed
application/pdf
http://eprints.biblio.unitn.it/1989/1/DISI%2D11%2D020.pdf
Rocca, Paolo and Manica, Luca and Massa, Andrea (2010) Ant Colony Based Hybrid Approach for Optimal Compromise Sum-Difference Patterns Synthesis. UNSPECIFIED.
http://eprints.biblio.unitn.it/1989/
oai:eprints.biblio.unitn.it:1990
2012-02-28T14:25:00Z
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Evolutionary Optimization as Applied to Inverse Scattering Problems
Rocca, Paolo
Benedetti, Manuel
Donelli, Massimo
Franceschini, Davide
Massa, Andrea
TK7885 Computer Engineering
QC661 Electromagnetic Theory
QC760 Electromagnetism
This report is aimed at presenting an overview of Evolutionary Algorithms as applied to the solution of inverse scattering problems.
2009-12
Departmental Technical Report
PeerReviewed
application/pdf
http://eprints.biblio.unitn.it/1990/1/DISI%2D11%2D019.pdf
Rocca, Paolo and Benedetti, Manuel and Donelli, Massimo and Franceschini, Davide and Massa, Andrea (2009) Evolutionary Optimization as Applied to Inverse Scattering Problems. UNSPECIFIED.
http://eprints.biblio.unitn.it/1990/
oai:eprints.biblio.unitn.it:1991
2012-02-28T14:25:01Z
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Physical limits to the capacity of wide-band Gaussian MIMO channels
Martini, Anna
Franceschetti, Massimo
Massa, Andrea
QC661 Electromagnetic Theory
TK5105.5 Computer Networks
QC760 Electromagnetism
In this letter a physical limit to the information capacity of a multiple-input multiple-output (MIMO) Gaussian channel is presented exploiting the theory of non-redundant sampling of scattered fields. For a MIMO narrow-band system of arbitrarily large spatial extension, the information capacity limit is the same as the one for a single-input single-output (SISO) ultra-wide band (UWB) system. For MIMO systems of finite size, wide band transmission, and absence of channel state information, space and frequency diversities can be optimally combined by allocating the signal power uniformly across space, and increasing linearly across frequency. (c) 2009 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other users, including reprinting/ republishing this material for advertising or promotional purposes, creating new collective works for resale or redistribution to servers or lists, or reuse of any copyrighted components of this work in other works.
2009-07
Departmental Technical Report
PeerReviewed
application/pdf
http://eprints.biblio.unitn.it/1991/1/DISI%2D11%2D018.R177.pdf
Martini, Anna and Franceschetti, Massimo and Massa, Andrea (2009) Physical limits to the capacity of wide-band Gaussian MIMO channels. UNSPECIFIED.
http://eprints.biblio.unitn.it/1991/
oai:eprints.biblio.unitn.it:1992
2012-02-28T14:25:01Z
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Almost Time-Independent Performance in Time-Modulated Linear Arrays
Manica, Luca
Rocca, Paolo
Poli, Lorenzo
Massa, Andrea
TK7885 Computer Engineering
QC661 Electromagnetic Theory
TK5105.5 Computer Networks
QC760 Electromagnetism
This letter deals with the optimization of the switchon instants of the radio-frequency (RF) switches used for the synthesis of time-modulated linear arrays. It is shown that these additional degrees of freedom allow one to increase the stability of the pattern instantaneously radiated by the antenna. Representative results, obtained by means of a Particle Swarm Optimization, are reported and discussed. (c) 2009 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other users, including reprinting/ republishing this material for advertising or promotional purposes, creating new collective works for resale or redistribution to servers or lists, or reuse of any copyrighted components of this work in other works.
2010-01
Departmental Technical Report
PeerReviewed
application/pdf
http://eprints.biblio.unitn.it/1992/1/DISI%2D11%2D017.R176.pdf
Manica, Luca and Rocca, Paolo and Poli, Lorenzo and Massa, Andrea (2010) Almost Time-Independent Performance in Time-Modulated Linear Arrays. UNSPECIFIED.
http://eprints.biblio.unitn.it/1992/
oai:eprints.biblio.unitn.it:1993
2012-02-28T14:25:02Z
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Linear Array Thinning Exploiting Almost Difference Sets
Oliveri, Giacomo
Donelli, Massimo
Massa, Andrea
TK7885 Computer Engineering
QC661 Electromagnetic Theory
TK5105.5 Computer Networks
QC760 Electromagnetism
This paper describes a class of linear thinned arrays with predictable and well-behaved sidelobes. The element placement is based on almost difference sets and the array power pattern is forced to pass through N uniformly-spaced values that, although neither equal nor constant as for difference sets, are a-priori known from the knowledge of the aperture size, the number of active array elements K, and the features of the correlation function. Such a property allows one to predict the bounds of the confidence range of the peak sidelobe of the admissible arrays obtainable through simple shift operations on a binary sequence. The expected peak sidelobe performances turn out to be comparable with those from difference sets, even though obtainable in a wider set of array configurations, and improved in comparison with cut-and-try random-placements. (c) 2009 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other users, including reprinting/ republishing this material for advertising or promotional purposes, creating new collective works for resale or redistribution to servers or lists, or reuse of any copyrighted components of this work in other works.
2009-12
Departmental Technical Report
PeerReviewed
application/pdf
http://eprints.biblio.unitn.it/1993/1/DISI%2D11%2D016.R175.pdf
Oliveri, Giacomo and Donelli, Massimo and Massa, Andrea (2009) Linear Array Thinning Exploiting Almost Difference Sets. UNSPECIFIED.
http://eprints.biblio.unitn.it/1993/
oai:eprints.biblio.unitn.it:1994
2012-02-28T14:25:03Z
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Synthesis of Compromise Sum-DifferenceArrays through Time-Modulation
Rocca, Paolo
Manica, Luca
Poli, Lorenzo
Massa, Andrea
TK7885 Computer Engineering
QC661 Electromagnetic Theory
QC760 Electromagnetism
In this paper, time-modulation is exploited for the synthesis of monopulse sub-arrayed antennas. The solution of the compromise sum-difference problem is obtained by setting the set of static excitations to an optimal sum set and synthesizing the “best compromise” difference pattern through a Continuous Partition Method (CPM) based approach. The array elements are aggregated into sub-arrays controlled by means of RF switches with optimized “on” time-durations. The switch-on instants of the pulse sequences are then computed by means of a particle swarm optimizer to reduce the interferences caused by the sideband radiations. A selected set of numerical results is reported to assess the potentialities of time-modulation in dealing with the synthesis problem at hand. This paper is a postprint of a paper submitted to and accepted for publication in Radar, Sonar & Navigation and is subject to Institution of Engineering and Technology Copyright. The copy of record is available at IET Digital Library.
2009-01
Departmental Technical Report
PeerReviewed
application/pdf
http://eprints.biblio.unitn.it/1994/1/DISI%2D11%2D015.pdf
Rocca, Paolo and Manica, Luca and Poli, Lorenzo and Massa, Andrea (2009) Synthesis of Compromise Sum-DifferenceArrays through Time-Modulation. UNSPECIFIED.
http://eprints.biblio.unitn.it/1994/
oai:eprints.biblio.unitn.it:1995
2012-02-28T14:25:03Z
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A DVBH/GSM/UMTS Planar Antenna for Multimode Wireless Devices
Lizzi, Leonardo
Viani, Federico
Zeni, Edoardo
Massa, Andrea
TK7885 Computer Engineering
QC661 Electromagnetic Theory
TK5105.5 Computer Networks
QC760 Electromagnetism
In this letter, the prototype of a planar antenna working in three different frequency bands and suitable to be integrated in multimode wireless devices is described. The antenna is fed by a single RF port without any matching circuit and it operates in a DVBH channel and at GSM and UMTS frequency bands. Its dimension is of 0.15 lambda at the lower frequency band. The effectiveness and feasibility of the proposed antenna is assessed by means of both simulations and measurements. (c) 2009 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other users, including reprinting/ republishing this material for advertising or promotional purposes, creating new collective works for resale or redistribution to servers or lists, or reuse of any copyrighted components of this work in other works.
2011-01
Departmental Technical Report
PeerReviewed
application/pdf
http://eprints.biblio.unitn.it/1995/1/DISI%2D11%2D014.R173.pdf
Lizzi, Leonardo and Viani, Federico and Zeni, Edoardo and Massa, Andrea (2011) A DVBH/GSM/UMTS Planar Antenna for Multimode Wireless Devices. UNSPECIFIED.
http://eprints.biblio.unitn.it/1995/
oai:eprints.biblio.unitn.it:1996
2012-02-28T14:25:04Z
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Dual-Band Spline-Shaped PCB Antenna for Wi-Fi Applications
Lizzi, Leonardo
Viani, Federico
Massa, Andrea
TK7885 Computer Engineering
QC661 Electromagnetic Theory
QC760 Electromagnetism
In this letter, a dual-band PCB antenna suitable for Wi-Fi applications is described. The antenna geometry is modeled by means of a spline curve and a partial metallic ground plane. The proposed antenna is suitable for Wi-Fi bands and it guarantees good impedance matching conditions at the working frequencies centered at 2.448GHz and 5.512GHz, respectively. A prototype of the synthesized antenna, built on an Arlon substrate, is analyzed to assess the effectiveness of the proposed antenna model in terms of VSWR values as well as radiation patterns. (c) 2009 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other users, including reprinting/ republishing this material for advertising or promotional purposes, creating new collective works for resale or redistribution to servers or lists, or reuse of any copyrighted components of this work in other works.
2011-01
Departmental Technical Report
PeerReviewed
application/pdf
http://eprints.biblio.unitn.it/1996/1/DISI%2D11%2D025.R172.pdf
Lizzi, Leonardo and Viani, Federico and Massa, Andrea (2011) Dual-Band Spline-Shaped PCB Antenna for Wi-Fi Applications. UNSPECIFIED.
http://eprints.biblio.unitn.it/1996/
oai:eprints.biblio.unitn.it:1997
2012-02-28T14:25:04Z
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An Improved Excitation Matching Method based on an Ant Colony Optimization for Suboptimal-Free Clustering in Sum-Difference Compromise Synthesis
Rocca, Paolo
Manica, Luca
Massa, Andrea
TK7885 Computer Engineering
QC661 Electromagnetic Theory
TK5105.5 Computer Networks
QC760 Electromagnetism
Dealing with an excitation matching method, this paper presents a global optimization strategy for the optimal clustering in sum-difference compromise linear arrays. Starting from a combinatorial formulation of the problem at hand, the proposed technique is aimed at determining the sub-array configuration expressed as the optimal path inside a directed acyclic graph structure modelling the solution space. Towards this end, an ant colony metaheuristic is used to benefit of its hill-climbing properties in dealing with the non-convexity of the sub-arraying as well as in managing graph searches. A selected set of numerical experiments are reported to assess the efficiency and current limitations of the ant-based strategy also in comparison with previous local combinatorial search methods. (c) 2009 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other users, including reprinting/ republishing this material for advertising or promotional purposes, creating new collective works for resale or redistribution to servers or lists, or reuse of any copyrighted components of this work in other works.
2009-08
Departmental Technical Report
PeerReviewed
application/pdf
http://eprints.biblio.unitn.it/1997/1/DISI%2D11%2D026.R171.pdf
Rocca, Paolo and Manica, Luca and Massa, Andrea (2009) An Improved Excitation Matching Method based on an Ant Colony Optimization for Suboptimal-Free Clustering in Sum-Difference Compromise Synthesis. UNSPECIFIED.
http://eprints.biblio.unitn.it/1997/
oai:eprints.biblio.unitn.it:1998
2012-02-28T14:25:04Z
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An Innovative Multi-Resolution Approach for DOA Estimation based on a Support Vector Classification
Donelli, Massimo
Viani, Federico
Rocca, Paolo
Massa, Andrea
TK7885 Computer Engineering
QC661 Electromagnetic Theory
TK5105.5 Computer Networks
QC760 Electromagnetism
The knowledge of the directions of arrival (DOAs) of the signals impinging on an antenna receiver enables the use of adaptive control algorithm suitable for limiting the effects of interferences and increasing the gain towards the desired signals in order to improve the performances of wireless communication systems. In this paper, an innovative multiresolution approach for the real-time DOA estimation of multiple signals impinging on a planar array is presented. The method is based on a support vector classifier and it exploits a multi-scaling procedure to enhance the angular resolution of the detection process in the regions of incidence of the incoming waves. The data acquired from the array sensors are iteratively processed with a support vector machine (SVM) customized to the problem at hand. The final result is the definition of a map of the probability that a signal impinges on the antenna from a fixed angular direction. Selected numerical results, concerned with both single and multiple signals, are provided to assess potentialities and current limitations of the proposed approach. (c) 2009 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other users, including reprinting/ republishing this material for advertising or promotional purposes, creating new collective works for resale or redistribution to servers or lists, or reuse of any copyrighted components of this work in other works.
2009-08
Departmental Technical Report
PeerReviewed
application/pdf
http://eprints.biblio.unitn.it/1998/1/DISI%2D11%2D027.R170.pdf
Donelli, Massimo and Viani, Federico and Rocca, Paolo and Massa, Andrea (2009) An Innovative Multi-Resolution Approach for DOA Estimation based on a Support Vector Classification. UNSPECIFIED.
http://eprints.biblio.unitn.it/1998/
oai:eprints.biblio.unitn.it:1999
2012-02-28T14:25:06Z
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Sidelobe Reduction through Element Phase Control in Uniform Sub-arrayed Array Antennas
Rocca, Paolo
Haupt, Randy
Massa, Andrea
TK7885 Computer Engineering
QC661 Electromagnetic Theory
TK5105.5 Computer Networks
QC760 Electromagnetism
When dealing with the synthesis sub-arrayed array antennas, the phase control, necessary for beam steering purposes, can be also exploited to reduce the undesired secondary lobes caused by the periodic spatial distribution of the amplitude excitations on the aperture when contiguous and identical subarrays are used. In order to determine the phase values of the array elements for a fixed sub-array amplitude weighting, the iterative projection method is adopted. Some representative results are shown to assess the effectiveness of the method. (c) 2009 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other users, including reprinting/ republishing this material for advertising or promotional purposes, creating new collective works for resale or redistribution to servers or lists, or reuse of any copyrighted components of this work in other works.
2011-01
Departmental Technical Report
PeerReviewed
application/pdf
http://eprints.biblio.unitn.it/1999/1/DISI%2D11%2D028.R169.pdf
Rocca, Paolo and Haupt, Randy and Massa, Andrea (2011) Sidelobe Reduction through Element Phase Control in Uniform Sub-arrayed Array Antennas. UNSPECIFIED.
http://eprints.biblio.unitn.it/1999/
oai:eprints.biblio.unitn.it:2000
2012-02-28T14:25:07Z
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Iterative Multi-Resolution Retrieval of Non-Measurable Equivalent Currents for Imaging of Dielectric Objects
Rocca, Paolo
Donelli, Massimo
Gragnani, Gian Luigi
Massa, Andrea
TK7885 Computer Engineering
QC661 Electromagnetic Theory
TK5105.5 Computer Networks
QC760 Electromagnetism
BD Speculative Philosophy
In this report, an iterative multi-resolution method for the reconstruction of the unmeasured components of the equivalent current density is proposed in order to improve the retrieval of the dielectric properties of an unknown scenario probed by interrogating electromagnetic waves.
2009-05
Departmental Technical Report
PeerReviewed
application/pdf
http://eprints.biblio.unitn.it/2000/1/DISI%2D11%2D029.pdf
Rocca, Paolo and Donelli, Massimo and Gragnani, Gian Luigi and Massa, Andrea (2009) Iterative Multi-Resolution Retrieval of Non-Measurable Equivalent Currents for Imaging of Dielectric Objects. UNSPECIFIED.
http://eprints.biblio.unitn.it/2000/
oai:eprints.biblio.unitn.it:2002
2012-02-28T14:25:08Z
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A Hybrid Approach Based on PSO and Hadamard Difference Sets for the Synthesis of Square Thinned Arrays
Donelli, Massimo
Martini, Anna
Massa, Andrea
TK7885 Computer Engineering
QC661 Electromagnetic Theory
QC760 Electromagnetism
A hybrid approach for the synthesis of planar thinned antenna arrays is presented. The proposed solution exploits and combines the most attractive features of a particle swarm algorithm and those of a combinatorial method based on the noncyclic difference sets of Hadamard type. Numerical experiments validate the proposed solution, showing improvements with respect to previous results. (c) 2009 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other users, including reprinting/ republishing this material for advertising or promotional purposes, creating new collective works for resale or redistribution to servers or lists, or reuse of any copyrighted components of this work in other works.
2009-08
Departmental Technical Report
PeerReviewed
application/pdf
http://eprints.biblio.unitn.it/2002/1/DISI%2D11%2D031.R166.pdf
Donelli, Massimo and Martini, Anna and Massa, Andrea (2009) A Hybrid Approach Based on PSO and Hadamard Difference Sets for the Synthesis of Square Thinned Arrays. UNSPECIFIED.
http://eprints.biblio.unitn.it/2002/
oai:eprints.biblio.unitn.it:2003
2012-02-28T14:25:08Z
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A Multi-Resolution Technique Based on Shape Optimization for the Reconstruction of Homogeneous Dielectric Objects
Benedetti, Manuel
Lesselier, Dominique
Lambert, Marc
Massa, Andrea
TK7885 Computer Engineering
QC661 Electromagnetic Theory
QC760 Electromagnetism
In the framework of inverse scattering techniques, this paper presents the integration of a multi-resolution technique and the level-set method for qualitative microwave imaging.
2009-01
Departmental Technical Report
PeerReviewed
application/pdf
http://eprints.biblio.unitn.it/2003/1/DISI%2D11%2D032.pdf
Benedetti, Manuel and Lesselier, Dominique and Lambert, Marc and Massa, Andrea (2009) A Multi-Resolution Technique Based on Shape Optimization for the Reconstruction of Homogeneous Dielectric Objects. UNSPECIFIED.
http://eprints.biblio.unitn.it/2003/
oai:eprints.biblio.unitn.it:2004
2012-02-28T14:25:09Z
7374617475733D707562
7375626A656374733D51:5143:5143373630
7375626A656374733D51:5143:5143363631
7375626A656374733D54:544B:544B37383835
74797065733D746563687265706F7274
A Fast Graph-Searching Algorithm Enabling the Efficient Synthesis of Sub-Arrayed Planar Monopulse Antennas
Manica, Luca
Rocca, Paolo
Benedetti, Manuel
Massa, Andrea
TK7885 Computer Engineering
QC661 Electromagnetic Theory
QC760 Electromagnetism
In this paper, an innovative approach in its different implementations for the synthesis of compromise sum and difference patterns of monopulse planar arrays is presented. The synthesis method is based on a sub-arraying technique aimed at generating the compromise patterns through an optimal excitation matching procedure. By exploiting some properties of the solution space, the synthesis problem is reformulated as a combinatorial one to allow a considerable saving of computational resources. Thanks to a graph-based representation of the solution space, the use of an efficient path-searching algorithm is enabled to speed-up the convergence to the compromise solution. In the numerical validation, a set of representative examples concerned with both pattern matching problems and patternfeature optimization are reported in order to assess the effectiveness and flexibility of the proposed approach. Comparisons with previously published results and solutions obtained by a hybrid version of the approach customized to deal with the optimization of the sidelobe level (SLL) are reported and discussed, as well. (c) 2009 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other users, including reprinting/ republishing this material for advertising or promotional purposes, creating new collective works for resale or redistribution to servers or lists, or reuse of any copyrighted components of this work in other works.
2009-03
Departmental Technical Report
PeerReviewed
application/pdf
http://eprints.biblio.unitn.it/2004/1/DISI%2D11%2D033.R164.pdf
Manica, Luca and Rocca, Paolo and Benedetti, Manuel and Massa, Andrea (2009) A Fast Graph-Searching Algorithm Enabling the Efficient Synthesis of Sub-Arrayed Planar Monopulse Antennas. UNSPECIFIED.
http://eprints.biblio.unitn.it/2004/
oai:eprints.biblio.unitn.it:2005
2012-02-28T14:25:09Z
7374617475733D707562
7375626A656374733D51:5143:5143373630
7375626A656374733D51:5143:5143363631
7375626A656374733D54:544B:544B37383835
74797065733D746563687265706F7274
A Hybrid Approach to the Synthesis of Sub-Arrayed Monopulse Linear Arrays
Rocca, Paolo
Manica, Luca
Azaro, Renzo
Massa, Andrea
TK7885 Computer Engineering
QC661 Electromagnetic Theory
QC760 Electromagnetism
In this paper, a hybrid approach for the synthesis of the ldquooptimalrdquo compromise between sum and difference patterns for subarrayed monopulse antennas is presented. First, the subarray configuration is determined by exploiting the knowledge of the optimum difference mode coefficients to reduce the dimension of the searching space. In the second step, the subarray weights are computed by means of a convex programming procedure, which takes advantages from the convexity, for a fixed clustering, of the problem at hand. A set of representative results is reported to assess the effectiveness of the proposed approach. Comparisons with state-of-the-art techniques are also presented. (c) 2009 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other users, including reprinting/ republishing this material for advertising or promotional purposes, creating new collective works for resale or redistribution to servers or lists, or reuse of any copyrighted components of this work in other works.
2011-01
Departmental Technical Report
PeerReviewed
application/pdf
http://eprints.biblio.unitn.it/2005/1/DISI%2D11%2D030.R163.pdf
Rocca, Paolo and Manica, Luca and Azaro, Renzo and Massa, Andrea (2011) A Hybrid Approach to the Synthesis of Sub-Arrayed Monopulse Linear Arrays. UNSPECIFIED.
http://eprints.biblio.unitn.it/2005/
oai:eprints.biblio.unitn.it:2006
2012-02-28T14:25:10Z
7374617475733D707562
7375626A656374733D51:5143:5143373630
7375626A656374733D51:5143:5143363631
7375626A656374733D54:544B:544B37383835
74797065733D746563687265706F7274
Design of Compromise Sum-Difference Patterns through the Iterative Contiguous Partition Method
Rocca, Paolo
Manica, Luca
Martini, Anna
Massa, Andrea
TK7885 Computer Engineering
QC661 Electromagnetic Theory
QC760 Electromagnetism
In this paper, an innovative approach for the synthesis of sub-arrayed monopulse linear arrays is presented. A compromise difference pattern is obtained through an optimal excitations matching method based on the contiguous partition technique integrated in an iterative procedure ensuring, at the same time, the optimization of the sidelobe level (or other beam pattern features). The flexibility of such an approach allows one to synthesize various difference patterns characterized by different trade-off between angular resolution and noise/interferences rejection in order to match the user-defined requirements. On the other hand, thanks to its computational efficiency, synthesis problems concerned with large arrays are easily managed, as well. An exhaustive numerical validation assesses the reliability and accuracy of the method pointing out the improvements upon state-of-the-art sub-arraying techniques. This paper is a postprint of a paper submitted to and accepted for publication in Microwaves, Antennas & Propagation and is subject to Institution of Engineering and Technology Copyright. The copy of record is available at IET Digital Library.
2009-01
Departmental Technical Report
PeerReviewed
application/pdf
http://eprints.biblio.unitn.it/2006/1/DISI%2D11%2D035.pdf
Rocca, Paolo and Manica, Luca and Martini, Anna and Massa, Andrea (2009) Design of Compromise Sum-Difference Patterns through the Iterative Contiguous Partition Method. UNSPECIFIED.
http://eprints.biblio.unitn.it/2006/
oai:eprints.biblio.unitn.it:2007
2012-02-28T14:25:10Z
7374617475733D707562
7375626A656374733D51:5143:5143373630
7375626A656374733D51:5143:5143363631
7375626A656374733D54:544B:544B37383835
74797065733D746563687265706F7274
Boresight Slope Optimization of Sub-arrayed Linear Arrays through the Contiguous Partition Method
Manica, Luca
Rocca, Paolo
Pastorino, Matteo
Massa, Andrea
TK7885 Computer Engineering
QC661 Electromagnetic Theory
QC760 Electromagnetism
The optimization of the normalized boresight slope of the difference pattern in sub-arrayed linear monopulse antennas is presented. The knowledge of the independently optimum difference excitations, which provide the maximum normalized boresight slope, is exploited with an efficient excitation matching technique based on the contiguous partition method. A set of numerical experiments are provided to assess the effectiveness of the proposed method in reaching the best achievable performances even though with a small number of sub-arrays. 2008 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other users, including reprinting/ republishing this material for advertising or promotional purposes, creating new collective works for resale or redistribution to servers or lists, or reuse of any copyrighted components of this work in other works.
2011-01
Departmental Technical Report
PeerReviewed
application/pdf
http://eprints.biblio.unitn.it/2007/1/DISI%2D11%2D036.R161.pdf
Manica, Luca and Rocca, Paolo and Pastorino, Matteo and Massa, Andrea (2011) Boresight Slope Optimization of Sub-arrayed Linear Arrays through the Contiguous Partition Method. UNSPECIFIED.
http://eprints.biblio.unitn.it/2007/
oai:eprints.biblio.unitn.it:2009
2012-02-28T14:25:10Z
7374617475733D707562
7375626A656374733D51:5143:5143373630
7375626A656374733D51:5143:5143363631
7375626A656374733D54:544B:544B37383835
74797065733D746563687265706F7274
An Excitation Matching Procedure for Sub-Arrayed Monopulse Arrays with Maximum Directivity
Manica, Luca
Rocca, Paolo
Massa, Andrea
TK7885 Computer Engineering
QC661 Electromagnetic Theory
QC760 Electromagnetism
In this paper, the maximization of the directivity of compromise difference patterns in subarrayed monopulse linear array antennas with optimum sum mode is addressed by means of a two-stage excitation matching procedure. The knowledge of the independently optimum difference excitations, which provide the maximum directivity, is exploited with an efficient matching technique based on the contiguous partition method. Simple and reliable compromise solutions, characterized by a reduced complexity as well as easier antenna manufacturing, are synthesized to assess the effectiveness of the proposed method also in comparison with state-of-the-art methods devoted to the directivity maximization. This paper is a postprint of a paper submitted to and accepted for publication in Radar, Sonar & Navigation and is subject to Institution of Engineering and Technology Copyright. The copy of record is available at IET Digital Library.
2009-02
Departmental Technical Report
PeerReviewed
application/pdf
http://eprints.biblio.unitn.it/2009/1/DISI%2D11%2D038.pdf
Manica, Luca and Rocca, Paolo and Massa, Andrea (2009) An Excitation Matching Procedure for Sub-Arrayed Monopulse Arrays with Maximum Directivity. UNSPECIFIED.
http://eprints.biblio.unitn.it/2009/
oai:eprints.biblio.unitn.it:2010
2012-02-28T14:25:11Z
7374617475733D707562
7375626A656374733D51:5143:5143373630
7375626A656374733D51:5143:5143363631
7375626A656374733D54:544B:544B37383835
7375626A656374733D54:544B:544B353130352E35
74797065733D746563687265706F7274
Experimental validation of percolation-based models for propagation prediction
Azaro, Renzo
Martini, Anna
Massa, Andrea
TK7885 Computer Engineering
QC661 Electromagnetic Theory
TK5105.5 Computer Networks
QC760 Electromagnetism
In this letter, an experimental validation of percolation-based approaches for the prediction of wave propagation in random media is presented. Measurements are collected in a real controlled environment, where the obstacles are stochastically placed in a two-dimensional grid according to a known non-uniform density distribution. The obtained results show that, in spite of their simplicity, percolation-based approaches can be applied in real propagation problems. The definitive version is available at www3.interscience.wiley.com
2008-12
Departmental Technical Report
PeerReviewed
application/pdf
http://eprints.biblio.unitn.it/2010/1/DISI%2D11%2D039.pdf
Azaro, Renzo and Martini, Anna and Massa, Andrea (2008) Experimental validation of percolation-based models for propagation prediction. UNSPECIFIED.
http://eprints.biblio.unitn.it/2010/
oai:eprints.biblio.unitn.it:2011
2012-02-28T14:25:11Z
7374617475733D707562
7375626A656374733D51:5143:5143373630
7375626A656374733D51:5143:5143363631
7375626A656374733D54:544B:544B37383835
7375626A656374733D54:544B:544B353130352E35
74797065733D746563687265706F7274
A Miniaturized UWB Antenna for Wireless Dongle Devices
Viani, Federico
Lizzi, Leonardo
Azaro, Renzo
Massa, Andrea
TK7885 Computer Engineering
QC661 Electromagnetic Theory
TK5105.5 Computer Networks
QC760 Electromagnetism
In this letter, a planar Ultra WideBand (UWB)antenna suitable for the integration in wireless Universal Serial Bus (USB) dongles is described. The antenna has a bandwidth equal to 2GHz from 3GHz up to 5GHz with return loss values below −10 dB in the whole frequency range. To comply with UWB system needs, the antenna presents good distortionless properties when employed in a TX/RX system. Moreover, thanks to its simple shape and miniaturized geometry, the proposed prototype can be easily integrated and printed on dongle PCBs. In order to assess the reliability and efficiency of the antenna, a selected set of results from the experimental validation are shown and compared with the outcomes of the numerical simulations carried out during the synthesis process. (c) 2008 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other users, including reprinting/ republishing this material for advertising or promotional purposes, creating new collective works for resale or redistribution to servers or lists, or reuse of any copyrighted components of this work in other works.
2011-01
Departmental Technical Report
PeerReviewed
application/pdf
http://eprints.biblio.unitn.it/2011/1/DISI%2D11%2D040.R156.pdf
Viani, Federico and Lizzi, Leonardo and Azaro, Renzo and Massa, Andrea (2011) A Miniaturized UWB Antenna for Wireless Dongle Devices. UNSPECIFIED.
http://eprints.biblio.unitn.it/2011/
oai:eprints.biblio.unitn.it:2012
2012-02-28T14:25:12Z
7374617475733D707562
7375626A656374733D51:5143:5143373630
7375626A656374733D51:5143:5143363631
7375626A656374733D54:544B:544B37383835
74797065733D746563687265706F7274
A Monopolar Quad-Band Antenna based on a Hilbert Self-Affine Pre-Fractal Geometry
Azaro, Renzo
Viani, Federico
Lizzi, Leonardo
Zeni, Edoardo
Massa, Andrea
TK7885 Computer Engineering
QC661 Electromagnetic Theory
QC760 Electromagnetism
In this letter, the design of a quad-band antenna is presented. The antenna has a planar geometry printed on a dielectric substrate orthogonal to a reference ground plane and its geometrical parameters are optimized starting from a Hilbertlike pre-fractal reference shape. The reliability of the synthesized antenna is assessed by means of a set of experimental tests to verify its compliance with the project constraints. (c) 2009 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other users, including reprinting/ republishing this material for advertising or promotional purposes, creating new collective works for resale or redistribution to servers or lists, or reuse of any copyrighted components of this work in other works.
2011-01
Departmental Technical Report
PeerReviewed
application/pdf
http://eprints.biblio.unitn.it/2012/1/DISI%2D11%2D041.R155.pdf
Azaro, Renzo and Viani, Federico and Lizzi, Leonardo and Zeni, Edoardo and Massa, Andrea (2011) A Monopolar Quad-Band Antenna based on a Hilbert Self-Affine Pre-Fractal Geometry. UNSPECIFIED.
http://eprints.biblio.unitn.it/2012/
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