1,721,171 research outputs found
Optimization of difference patterns for monopulse antennas by a hybrid real/integer-coded differential evolution method
No full textOptimization of the difference patterns for monopulse antennas by a hybrid real/integer-coded differential evolution method
Author(s): Caorsi, S (Caorsi, S); Massa, A (Massa, A); Pastorino, M (Pastorino, M); Randazzo, A (Randazzo, A)
Source: IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION Volume: 53 Issue: 1 Pages: 372-376 DOI: 10.1109/TAP.2004.838788 Part: Part 2 Published: JAN 2005
Times Cited: 46 (from Web of Science)
Cited References: 9 [ view related records ] Citation Map
Abstract: The optimization of difference patterns of monopulse antennas is considered. The synthesis problem is recast as an optimization problem by defining a suitable cost function. In particular, in this paper, the cost function is based on constraints on the side-lobe levels. A subarray configuration is adopted and the excitations of the difference pattern are approximately determined. The optimization problem isefficiently solved by a differential evolution algorithm, which is able to contemporarily handle real and integer unknowns. Numerical results are reported concerning classical array configurations previously considered in the literature.
Accession Number: WOS:000226261600014
Document Type: Article
Language: English
Author Keywords: array antennas; evolutionary algorithm; monopulse antennas; sum and difference patterns
KeyWords Plus: SUM; ARRAYS
Reprint Address: Caorsi, S (reprint author), Univ Pavia, Dept Elect, Via Palestro 3, I-27100 Pavia, Italy
Addresses:
1. Univ Pavia, Dept Elect, I-27100 Pavia, Italy
E-mail Address: [email protected]
Publisher: IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 445 HOES LANE, PISCATAWAY, NJ 08855-4141 USA
Web of Science Category: Engineering, Electrical & Electronic; Telecommunications
Subject Category: Engineering; Telecommunications
IDS Number: 886VT
ISSN: 0018-926
Microwave medical imaging: potentialities and limitations of a stochastic optimization technique
No full textMicrowave medical imaging: Potentialities and limitations of a stochastic optimization technique
Author(s): Caorsi, S (Caorsi, S); Massa, A (Massa, A); Pastorino, M (Pastorino, M); Rosani, A (Rosani, A)
Source: IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES Volume: 52 Issue: 8 Pages: 1909-1916 DOI: 10.1109/tmtt.2004.832016 Part: Part 2 Published: AUG 2004
Times Cited: 14 (from Web of Science)
Cited References: 29 [ view related records ] Citation Map
Abstract: 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 constructed 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 an "object" modeling a tumor.
Accession Number: WOS:000223051400007
Document Type: Article
Language: English
Author Keywords: genetic algorithms (GAs); inverse scattering; medical imaging; microwave imaging; optimization problems
KeyWords Plus: BREAST-CANCER DETECTION; GENETIC ALGORITHMS; ELECTROMAGNETICS; TISSUES; MODEL
Reprint Address: Rosani, A (reprint author), Univ Pavia, Dept Elect, I-27100 Pavia, Italy
Addresses:
1. Univ Pavia, Dept Elect, I-27100 Pavia, Italy
2. Univ Trent, Dept Informat & Commun Technol, I-38050 Trent, Italy
3. Univ Genoa, Dept Biophys & Elect Engn, I-16145 Genoa, Italy
E-mail Address: [email protected], [email protected], [email protected]
Publisher: IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 445 HOES LANE, PISCATAWAY, NJ 08855 USA
Web of Science Category: Engineering, Electrical & Electronic
Subject Category: Engineering
IDS Number: 843BW
ISSN: 0018-948
Sexual asymmetry evidence in a dioecious cypress endemic to the Patagonian Andean Forest
No full textSpatial segregation in the European plethodontid salamander Speleomantes strinatii in relation to age and sex. Amphibia-Reptilia, 23(4): 505-510.
No full textStima dell'abbondanza di geotritone nella Stazione Biospeleologica di San Bartolomeo di Besolagno (GE)
No full textHow many macrogametophytes per individual should be analyzed to genotype conifer seed trees at genetic markers?
No full textRandom dynamics of simple oscillator with linear hysteretic damping
No full textThe paper concerns the response of a SDoF oscillator with linear hysteretic damping to a white noise excitation. The hysteretic damping is described by the Hilbert transform of the response displacement. The response statistical moments are computed by means of Ito's stochastic differential calculus. The results are compared with Monte Carlo simulation
Current trends and future challenges on nonlinear inverse scattering strategies based on optimization algorithms
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