Pub Date : 2008-11-17DOI: 10.1109/DIPED.2008.4671827
A. Sydor
Analytic expressions for main time reliability parameters of symmetric electromagnetic systems ramified to level 3 are worked out for the cases when the lifetime of ageing output elements is circumscribed by the Rayleigh distribution. These expressions make it possible to settle a number of problems of systems design and operation.
{"title":"Time reliability parameters of complicated electromagnetic systems","authors":"A. Sydor","doi":"10.1109/DIPED.2008.4671827","DOIUrl":"https://doi.org/10.1109/DIPED.2008.4671827","url":null,"abstract":"Analytic expressions for main time reliability parameters of symmetric electromagnetic systems ramified to level 3 are worked out for the cases when the lifetime of ageing output elements is circumscribed by the Rayleigh distribution. These expressions make it possible to settle a number of problems of systems design and operation.","PeriodicalId":178792,"journal":{"name":"2008 13th International Seminar/Workshop on Direct and Inverse Problems of Electromagnetic and Acoustic Wave Theory","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-11-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129062781","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2008-11-17DOI: 10.1109/DIPED.2008.4671826
M. Prishvin, L. Manukyan, V. Jeladze, I. Petoev, V. Tabatadze, D. Kakulia, R. Zaridze
A new algorithm for construction of artificial blood vessel networks and a new approach to simulate heat exchange in tissue are presented. The algorithm produces discrete three-dimensional geometric representations of both arterial and venous networks. The key feature of the algorithm is that growth begins from the root points and it can work with any enclosed geometry. The main difference of proposed method is that blood perfusion occurs mainly in capillary. Two different methods of constructing blood velocity vector field in tissue accounting capillary blood flow are presented. It is needed for precise thermal analysis using the modified bio-heat equation to provide better prediction of thermal response of tissues exposed to RF energy.
{"title":"Numerical simulation of heat transfer in human tissue according to improved vascular structure model","authors":"M. Prishvin, L. Manukyan, V. Jeladze, I. Petoev, V. Tabatadze, D. Kakulia, R. Zaridze","doi":"10.1109/DIPED.2008.4671826","DOIUrl":"https://doi.org/10.1109/DIPED.2008.4671826","url":null,"abstract":"A new algorithm for construction of artificial blood vessel networks and a new approach to simulate heat exchange in tissue are presented. The algorithm produces discrete three-dimensional geometric representations of both arterial and venous networks. The key feature of the algorithm is that growth begins from the root points and it can work with any enclosed geometry. The main difference of proposed method is that blood perfusion occurs mainly in capillary. Two different methods of constructing blood velocity vector field in tissue accounting capillary blood flow are presented. It is needed for precise thermal analysis using the modified bio-heat equation to provide better prediction of thermal response of tissues exposed to RF energy.","PeriodicalId":178792,"journal":{"name":"2008 13th International Seminar/Workshop on Direct and Inverse Problems of Electromagnetic and Acoustic Wave Theory","volume":"46 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-11-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130039634","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2008-11-17DOI: 10.1109/DIPED.2008.4671809
F. Bogdanov, D. Karkashadze, R. Jobava, E. Yavolovskaya, N. Bondarenko
Based on modified mirror image method, an equivalent model of layered glass antenna structure is suggested and applied to consider finite-sized glass antennas integrated into a full car model. The hybrid MoM is derived and validated by comparison of simulated results with those obtained by measurements on complex finite-sized grid antenna model placed near a metallic plate. Some EMC characteristics of full car model are demonstrated.
{"title":"Hybrid MoM scheme with integrated finite sized equivalent glass antenna model in application to automotive EMC problems","authors":"F. Bogdanov, D. Karkashadze, R. Jobava, E. Yavolovskaya, N. Bondarenko","doi":"10.1109/DIPED.2008.4671809","DOIUrl":"https://doi.org/10.1109/DIPED.2008.4671809","url":null,"abstract":"Based on modified mirror image method, an equivalent model of layered glass antenna structure is suggested and applied to consider finite-sized glass antennas integrated into a full car model. The hybrid MoM is derived and validated by comparison of simulated results with those obtained by measurements on complex finite-sized grid antenna model placed near a metallic plate. Some EMC characteristics of full car model are demonstrated.","PeriodicalId":178792,"journal":{"name":"2008 13th International Seminar/Workshop on Direct and Inverse Problems of Electromagnetic and Acoustic Wave Theory","volume":"47 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-11-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131821020","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2008-11-17DOI: 10.1109/DIPED.2008.4671823
O. Kusyi, N. N. Voitovich
Method proposed earlier for body reconstruction at its resonant frequencies is further developed. An attempt is made to establish the connection between the method applicability and existence of the Herglotz functions approximating the eigenoscillation field inside the body. Two propositions are given concerning convergence of the method for two cases when a Herglotz function coinciding with this field exists or not. Numerical results shoving the fast decreasing of the appropriate functional with increasing the number of measured patterns, are presented. Two ways of computer modeling of the input data are numerically compared.
{"title":"Computational aspects of constructing the approximating Herglotz functions in inverse scattering problems","authors":"O. Kusyi, N. N. Voitovich","doi":"10.1109/DIPED.2008.4671823","DOIUrl":"https://doi.org/10.1109/DIPED.2008.4671823","url":null,"abstract":"Method proposed earlier for body reconstruction at its resonant frequencies is further developed. An attempt is made to establish the connection between the method applicability and existence of the Herglotz functions approximating the eigenoscillation field inside the body. Two propositions are given concerning convergence of the method for two cases when a Herglotz function coinciding with this field exists or not. Numerical results shoving the fast decreasing of the appropriate functional with increasing the number of measured patterns, are presented. Two ways of computer modeling of the input data are numerically compared.","PeriodicalId":178792,"journal":{"name":"2008 13th International Seminar/Workshop on Direct and Inverse Problems of Electromagnetic and Acoustic Wave Theory","volume":"53 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-11-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121912798","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2008-11-17DOI: 10.1109/DIPED.2008.4671811
G. Bit‐Babik, A. Faraone
The technique to improve performance of specific GPS antennas on portable handsets by means of controlling the radiation pattern is presented in this paper. Location-based applications for handheld wireless communication devices may represent a significant revenue stream for cellular operators and may therefore add value to global positioning system (GPS) enabled handsets. Location-enabled features may also be desirable or even required, for instance, in professional and public safety radios. In order for location-based applications to provide the required quality-of-service (QoS), as it may be defined from case to case depending on the type of application, it is critical to implement GPS systems capable of operating reliably in the envisioned use scenarios.
{"title":"Antenna system improvement to control GPS radiation pattern on portable radios","authors":"G. Bit‐Babik, A. Faraone","doi":"10.1109/DIPED.2008.4671811","DOIUrl":"https://doi.org/10.1109/DIPED.2008.4671811","url":null,"abstract":"The technique to improve performance of specific GPS antennas on portable handsets by means of controlling the radiation pattern is presented in this paper. Location-based applications for handheld wireless communication devices may represent a significant revenue stream for cellular operators and may therefore add value to global positioning system (GPS) enabled handsets. Location-enabled features may also be desirable or even required, for instance, in professional and public safety radios. In order for location-based applications to provide the required quality-of-service (QoS), as it may be defined from case to case depending on the type of application, it is critical to implement GPS systems capable of operating reliably in the envisioned use scenarios.","PeriodicalId":178792,"journal":{"name":"2008 13th International Seminar/Workshop on Direct and Inverse Problems of Electromagnetic and Acoustic Wave Theory","volume":"67 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-11-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121951359","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2008-11-17DOI: 10.1109/DIPED.2008.4671814
M. Nesterenko, V. Katrich
The system of integral-differential equations relative to the surface ones of the equivalent magnetic current on the coupling hole of the electromagnetic volumes and the electrical current on the impedance body of finite sizes, induced by the set impressed sources of the electromagnetic field, has been obtained. The approximate analytical solution of the obtained equations system for the narrow slot in the broad wall of the rectangular waveguide, in which the thin impedance vibrator, which does not partition off the waveguide completely, is located, is given.
{"title":"Electromagnetic waves scattering by thin impedance vibrators and narrow slots in waveguides","authors":"M. Nesterenko, V. Katrich","doi":"10.1109/DIPED.2008.4671814","DOIUrl":"https://doi.org/10.1109/DIPED.2008.4671814","url":null,"abstract":"The system of integral-differential equations relative to the surface ones of the equivalent magnetic current on the coupling hole of the electromagnetic volumes and the electrical current on the impedance body of finite sizes, induced by the set impressed sources of the electromagnetic field, has been obtained. The approximate analytical solution of the obtained equations system for the narrow slot in the broad wall of the rectangular waveguide, in which the thin impedance vibrator, which does not partition off the waveguide completely, is located, is given.","PeriodicalId":178792,"journal":{"name":"2008 13th International Seminar/Workshop on Direct and Inverse Problems of Electromagnetic and Acoustic Wave Theory","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-11-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129803529","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2008-11-17DOI: 10.1109/DIPED.2008.4671793
F. Shubitidze, J. P. Fernández, Benjamin E. Barrows, I. Shamatava
We tailor the method of images to the magneto-quasistatic regime and use it to perform a rapid and accurate analysis of the effect of magnetic soil (with frequency-or time-dependent susceptibility) on data collected by the man-portable vector (MPV) time-domain (TD) sensor. The frequency-dependent complex magnetic susceptibility of the soil is approximated using a standard approach that assumes that the magnetic relaxation time is uniformly distributed between two time constants. We compare simulations to experimental data in order to illustrate the applicability and evaluate the speed and validity of our image model and to assess the effect of permeable soil on MPV-TD measurements.
{"title":"Rapid and accurate estimate of the effect of magnetically susceptible soil on MPV-TD sensor data using the method of images","authors":"F. Shubitidze, J. P. Fernández, Benjamin E. Barrows, I. Shamatava","doi":"10.1109/DIPED.2008.4671793","DOIUrl":"https://doi.org/10.1109/DIPED.2008.4671793","url":null,"abstract":"We tailor the method of images to the magneto-quasistatic regime and use it to perform a rapid and accurate analysis of the effect of magnetic soil (with frequency-or time-dependent susceptibility) on data collected by the man-portable vector (MPV) time-domain (TD) sensor. The frequency-dependent complex magnetic susceptibility of the soil is approximated using a standard approach that assumes that the magnetic relaxation time is uniformly distributed between two time constants. We compare simulations to experimental data in order to illustrate the applicability and evaluate the speed and validity of our image model and to assess the effect of permeable soil on MPV-TD measurements.","PeriodicalId":178792,"journal":{"name":"2008 13th International Seminar/Workshop on Direct and Inverse Problems of Electromagnetic and Acoustic Wave Theory","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-11-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131243193","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2008-11-17DOI: 10.1109/DIPED.2008.4671836
V. Matus, Y. Kunets’
The problem of interaction of a plane time-harmonic SH-wave with an elastic inclusion of non-classical cross-sections, when an interface crack is present between the infinite elastic matrix and the fiber, is considered. The method employed is a modified null field approach.
{"title":"Null field method of SH-wave scattering by partially debounded elastic inclusion","authors":"V. Matus, Y. Kunets’","doi":"10.1109/DIPED.2008.4671836","DOIUrl":"https://doi.org/10.1109/DIPED.2008.4671836","url":null,"abstract":"The problem of interaction of a plane time-harmonic SH-wave with an elastic inclusion of non-classical cross-sections, when an interface crack is present between the infinite elastic matrix and the fiber, is considered. The method employed is a modified null field approach.","PeriodicalId":178792,"journal":{"name":"2008 13th International Seminar/Workshop on Direct and Inverse Problems of Electromagnetic and Acoustic Wave Theory","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-11-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133827403","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2008-11-17DOI: 10.1109/DIPED.2008.4671810
P. Savenko, M. Tkach
One approach to the numerical solution of synthesis problem of antennas with flat radiating aperture according to the prescribed requirements to amplitude directivity pattern and presence of restrictions on norm of currents of excitation is stated. Nonuniqueness and branching of the solutions are characteristics of such class of problems. Finding the optimum solutions is reduced to investigation and numerical solution of Hammestein type nonlinear two-dimensional integral equation. Numerical algorithms for finding the branching lines and branch off solutions of this equation are constructed and justified. Numerical examples are given.
{"title":"Numerical solution of nonlinear synthesis problem of flat aperture with use of smoothing functional","authors":"P. Savenko, M. Tkach","doi":"10.1109/DIPED.2008.4671810","DOIUrl":"https://doi.org/10.1109/DIPED.2008.4671810","url":null,"abstract":"One approach to the numerical solution of synthesis problem of antennas with flat radiating aperture according to the prescribed requirements to amplitude directivity pattern and presence of restrictions on norm of currents of excitation is stated. Nonuniqueness and branching of the solutions are characteristics of such class of problems. Finding the optimum solutions is reduced to investigation and numerical solution of Hammestein type nonlinear two-dimensional integral equation. Numerical algorithms for finding the branching lines and branch off solutions of this equation are constructed and justified. Numerical examples are given.","PeriodicalId":178792,"journal":{"name":"2008 13th International Seminar/Workshop on Direct and Inverse Problems of Electromagnetic and Acoustic Wave Theory","volume":"213 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-11-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114998818","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2008-11-17DOI: 10.1109/DIPED.2008.4671835
Y. Kunets’, R. V. Rabosh
The antiplane dynamic problem for elastic medium with a thin piezoelectric curvilinear inclusion of variable thickness is considered. Effective boundary conditions for inclusion are obtained by the method of matched asymptotic expansions.
{"title":"Effective boundary conditions for a thin curved piezoelectric inclusion in elastic medium","authors":"Y. Kunets’, R. V. Rabosh","doi":"10.1109/DIPED.2008.4671835","DOIUrl":"https://doi.org/10.1109/DIPED.2008.4671835","url":null,"abstract":"The antiplane dynamic problem for elastic medium with a thin piezoelectric curvilinear inclusion of variable thickness is considered. Effective boundary conditions for inclusion are obtained by the method of matched asymptotic expansions.","PeriodicalId":178792,"journal":{"name":"2008 13th International Seminar/Workshop on Direct and Inverse Problems of Electromagnetic and Acoustic Wave Theory","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-11-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115407516","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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