136 research outputs found
An electromagnetic approach based on neural networks for the GPR investigation of buried cylinders
No full textAn electromagnetic approach based on neural networks for the GPR investigation of buried cylinders
Author(s): Caorsi, S (Caorsi, S); Cevini, G (Cevini, G)
Source: IEEE GEOSCIENCE AND REMOTE SENSING LETTERS Volume: 2 Issue: 1 Pages: 3-7 DOI: 10.1109/LGRS.2004.839648 Published: JAN 2005
Times Cited: 9 (from Web of Science)
Cited References: 24 [ view related records ] Citation Map
Abstract: In this letter, neural networks (NNs) are used to reconstruct the geometric and dielectric characteristics of buried cylinders. The NN is designed to work with input data extracted from the transient electric fields scattered by the target. To this aim, a simple simulation of a typical ground-penetrating radar setting is performed and different sets of data examined. Moreover, different neural network algorithms have been exploited, and results have been compared. Finally, the "robustness" of the proposed approach has been tested against noisy data and against uncertainties in the modelization.
Accession Number: WOS:000230795700001
Document Type: Article
Language: English
Author Keywords: buried objects; ground-penetrating radar (GPR); microwave imaging; neural network (NN)
KeyWords Plus: GROUND-PENETRATING RADAR; BORN ITERATIVE METHOD; INVERSE-SCATTERING; DIELECTRIC CHARACTERIZATION; CONDUCTING CYLINDERS; GRADIENT-METHOD; OBJECTS; TOMOGRAPHY
Reprint Address: Caorsi, S (reprint author), Univ Pavia, Dept Elect, I-27100 Pavia, Italy
Addresses:
1. Univ Pavia, Dept Elect, I-27100 Pavia, Italy
E-mail Address: [email protected], [email protected]
Publisher: IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 445 HOES LANE, PISCATAWAY, NJ 08855 USA
Web of Science Category: Geochemistry & Geophysics; Engineering, Electrical & Electronic; Remote Sensing
Subject Category: Geochemistry & Geophysics; Engineering; Remote Sensing
IDS Number: 949NP
ISSN: 1545-598
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
Complications of severe acute respiratory syndrome coronavirus 2 infection in children
No full textPurpose of review Although during the initial stages of COVID-19 pandemic, the pediatric population seemed to be less affected, a number of SARS-CoV-2-related manifestations emerged over time, the principal of which is the multisystem inflammatory syndrome in children (MIS-C). Here we provide an update on the main pediatric disorders associated with SARS-CoV-2 infection. Recent findings MIS-C is novel postinfectious manifestation with clinical features similar to Kawasaki disease and characterized by intense systemic inflammation affecting multiple organs. Many children required intensive care therapy because of circulatory shock, usually of myocardial origin. Appropriate treatment with immunomodulatory therapies led to favorable outcomes in most patients, with recovery of overall health and cardiac dysfunction. In addition to MIS-C, a variety of other complications of COVID-19 in children have been described, including thrombotic events, neurologic manifestations, and chilblain-like lesions. There is still uncertainty about the true prevalence of long COVID in children and its distinction from pandemic-related complaints. The experience gained so far with MIS-C and the other SARS-CoV-2-related complications in children and adolescents will facilitate accurate diagnosis and appropriate treatment. Further studies are needed to elucidate the pathophysiology of MIS-C and to determine the real impact of long-COVID in the pediatric age group
Type I interferonopathies in pediatric rheumatology
No full textDefective regulation of type I interferon response is associated with severe inflammatory phenotypes and autoimmunity. Type I interferonopathies are a clinically heterogenic group of Mendelian diseases with a constitutive activation of this pathway that might present as atypical, severe, early onset rheumatic diseases. Skin vasculopathy with chilblains and livedo reticularis, interstitial lung disease, and panniculitis are common. Recent studies have implicated abnormal responses to nucleic acid stimuli or defective regulation of downstream effector molecules in disease pathogenesis. As observed for IL1-Î2 and autoinflammatory diseases, knowledge of the defects responsible for type I interferonopathies will likely promote the development of targeted therapy
Dr. Tibaldi, et al reply
No full textWe are pleased by the interest of Ozen and colleagues1 for our work2 and appreciate their choice to test our predictive model of response to anakinra in their cohort of children with systemic juvenile idiopathic arthritis (sJIA). The authors used the same definition of complete clinical response (CCR) as in our study and quantified the activity of systemic disease through the systemic manifestation score (SMS) that we developed2
Critical role of STIR MRI in early detection of post-streptococcal periostitis with dysproteinaemia (Goldbloom's syndrome)
No full textIn 1966, Goldbloom et al. described two children who developed a peculiar clinical picture characterized by intermittent daily bone pain in the lower limbs, fever spikes, increased acute phase reactants and dysproteinaemia. The syndrome occurred two weeks after a group A β-haemolytic streptococcus infection. So far, only a few cases have been reported in the medical literature in English
Serum amyloid protein A concentration in cryopyrin-associated periodic syndromes patients treated with interleukin-1 beta antagonist
No full textCryopyrin-associated periodic syndromes (CAPS) are a group of chronic, relapsing autoinflammatory disorders which may be complicated by systemic AA amyloidosis. The aim of our study was to evaluate serum amyloid protein A (SAA) level in CAPS patients treated with Interleukin-1beta (IL-1β) antagonist and to correlate its level with treatment response
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