Pub Date : 2018-09-01DOI: 10.1109/DIPED.2018.8543261
A. Toktas, Deniz Ustun, E. Yiğit, K. Sabanci, M. Tekbaş
Radar absorbing material (RAM) is crucial for military vehicles that desired to be invisible to the radar systems. A vehicle coated with optimally designed multilayer RAM (MRAM) can be successfully hidden from the radar systems. At this point, optimum design of a MRAM in terms of electrical and geometric variables gains importance. In this study, variables in design of MRAM with various numbers of layers are optimally determined using artificial bee colony (ABC) which is the one of latest natural inspired algorithm. The MRAMs are considered to operate at the frequency range of 2-8 GHz and 1-20 GHz at normal incident. In optimization, a predefined material set including electrical variables existing in the literature is utilized for making a fairly comparison. The electrical variables and thickness of each layer are optimized for the objective of minimizing the reflectivity for a limited total thickness. The optimization is conducted through the formulation of impedance equivalent model in order to form the objective function. The formulation is verified through the designed MRAMs via a full wave electromagnetic solver. Moreover, a comparison is studied through the simulated MRAMs proposed in this study and the suggested ones designed using different algorithms. The proposed designs have the lest total thickness than the other ones as well as almost the same reflectivity with the best one in the literature.
{"title":"Optimally Synthesizing Multilayer Radar Absorbing Material (RAM) Using Artificial Bee Colony Algorithm","authors":"A. Toktas, Deniz Ustun, E. Yiğit, K. Sabanci, M. Tekbaş","doi":"10.1109/DIPED.2018.8543261","DOIUrl":"https://doi.org/10.1109/DIPED.2018.8543261","url":null,"abstract":"Radar absorbing material (RAM) is crucial for military vehicles that desired to be invisible to the radar systems. A vehicle coated with optimally designed multilayer RAM (MRAM) can be successfully hidden from the radar systems. At this point, optimum design of a MRAM in terms of electrical and geometric variables gains importance. In this study, variables in design of MRAM with various numbers of layers are optimally determined using artificial bee colony (ABC) which is the one of latest natural inspired algorithm. The MRAMs are considered to operate at the frequency range of 2-8 GHz and 1-20 GHz at normal incident. In optimization, a predefined material set including electrical variables existing in the literature is utilized for making a fairly comparison. The electrical variables and thickness of each layer are optimized for the objective of minimizing the reflectivity for a limited total thickness. The optimization is conducted through the formulation of impedance equivalent model in order to form the objective function. The formulation is verified through the designed MRAMs via a full wave electromagnetic solver. Moreover, a comparison is studied through the simulated MRAMs proposed in this study and the suggested ones designed using different algorithms. The proposed designs have the lest total thickness than the other ones as well as almost the same reflectivity with the best one in the literature.","PeriodicalId":146873,"journal":{"name":"2018 XXIIIrd International Seminar/Workshop on Direct and Inverse Problems of Electromagnetic and Acoustic Wave Theory (DIPED)","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128823637","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 : 2018-09-01DOI: 10.1109/diped.2018.8543326
{"title":"[Blank page]","authors":"","doi":"10.1109/diped.2018.8543326","DOIUrl":"https://doi.org/10.1109/diped.2018.8543326","url":null,"abstract":"","PeriodicalId":146873,"journal":{"name":"2018 XXIIIrd International Seminar/Workshop on Direct and Inverse Problems of Electromagnetic and Acoustic Wave Theory (DIPED)","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131463829","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 : 2018-09-01DOI: 10.1109/DIPED.2018.8543126
Tornike Shubitidze, B. Barrowes, Evan Chapman, Mikheil Prishvin, K. O'Neill, F. Shubitidze
This paper presents the unconditional Crank -Nicolson finite-difference time-domain (CN-FDTD) scheme method in the cylindrical coordinate for solving underwater electromagnetic induction problems. First, a general CN-FDTD formulation is given, and then numerical results are demonstrated for a loop current source excitation in a conducting multilayer structure. The comparisons between CN-FDTD and traditional FDTD methods are given. The studies demonstrate the accuracy and capability of the proposed algorithm for modeling underwater EMI induction problems in the time domain.
{"title":"The Crank-Nicolson FDTD Method in Cylindrical Coordinates and Its Application to Underwater UXO Detection and Classification Problems","authors":"Tornike Shubitidze, B. Barrowes, Evan Chapman, Mikheil Prishvin, K. O'Neill, F. Shubitidze","doi":"10.1109/DIPED.2018.8543126","DOIUrl":"https://doi.org/10.1109/DIPED.2018.8543126","url":null,"abstract":"This paper presents the unconditional Crank -Nicolson finite-difference time-domain (CN-FDTD) scheme method in the cylindrical coordinate for solving underwater electromagnetic induction problems. First, a general CN-FDTD formulation is given, and then numerical results are demonstrated for a loop current source excitation in a conducting multilayer structure. The comparisons between CN-FDTD and traditional FDTD methods are given. The studies demonstrate the accuracy and capability of the proposed algorithm for modeling underwater EMI induction problems in the time domain.","PeriodicalId":146873,"journal":{"name":"2018 XXIIIrd International Seminar/Workshop on Direct and Inverse Problems of Electromagnetic and Acoustic Wave Theory (DIPED)","volume":"364 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114528455","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 : 2018-09-01DOI: 10.1109/diped.2018.8543280
{"title":"[Copyright notice]","authors":"","doi":"10.1109/diped.2018.8543280","DOIUrl":"https://doi.org/10.1109/diped.2018.8543280","url":null,"abstract":"","PeriodicalId":146873,"journal":{"name":"2018 XXIIIrd International Seminar/Workshop on Direct and Inverse Problems of Electromagnetic and Acoustic Wave Theory (DIPED)","volume":"67 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115541514","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 : 2018-09-01DOI: 10.1109/diped.2018.8543305
{"title":"[Blank page]","authors":"","doi":"10.1109/diped.2018.8543305","DOIUrl":"https://doi.org/10.1109/diped.2018.8543305","url":null,"abstract":"","PeriodicalId":146873,"journal":{"name":"2018 XXIIIrd International Seminar/Workshop on Direct and Inverse Problems of Electromagnetic and Acoustic Wave Theory (DIPED)","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123599107","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 : 2018-09-01DOI: 10.1109/diped.2018.8543275
{"title":"[Blank page]","authors":"","doi":"10.1109/diped.2018.8543275","DOIUrl":"https://doi.org/10.1109/diped.2018.8543275","url":null,"abstract":"","PeriodicalId":146873,"journal":{"name":"2018 XXIIIrd International Seminar/Workshop on Direct and Inverse Problems of Electromagnetic and Acoustic Wave Theory (DIPED)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128947526","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 : 2018-09-01DOI: 10.1109/diped.2018.8543287
{"title":"Medical and Geophysical Applications","authors":"","doi":"10.1109/diped.2018.8543287","DOIUrl":"https://doi.org/10.1109/diped.2018.8543287","url":null,"abstract":"","PeriodicalId":146873,"journal":{"name":"2018 XXIIIrd International Seminar/Workshop on Direct and Inverse Problems of Electromagnetic and Acoustic Wave Theory (DIPED)","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132219175","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 : 2018-09-01DOI: 10.1109/DIPED.2018.8543130
L. Gheonjian, T. Paatashvili, M. Oragvelidze, P. Tsotskolauri
We represents the modular concept and the final structure of Tbilisi State University ELF net standard observation station. The project concerns the consistent development of a dense network for Caucasus and Anatolian-Iranian Plateau tectonic faults system state monitoring. The modular concept provides the possibility to choose the most convenient configuration of the station, based on the specific characteristics of the fault and the operating and maintenance conditions. The station is completely autonomous. It can accumulate and transmit data. In comparison with the first prototypes, the noise characteristics of the station were significantly improved.
{"title":"Tbilisi State University Extremely Low Frequency Radiation Research Net (ELFTSU Net): the Concept and Structure of ELF Observation Station","authors":"L. Gheonjian, T. Paatashvili, M. Oragvelidze, P. Tsotskolauri","doi":"10.1109/DIPED.2018.8543130","DOIUrl":"https://doi.org/10.1109/DIPED.2018.8543130","url":null,"abstract":"We represents the modular concept and the final structure of Tbilisi State University ELF net standard observation station. The project concerns the consistent development of a dense network for Caucasus and Anatolian-Iranian Plateau tectonic faults system state monitoring. The modular concept provides the possibility to choose the most convenient configuration of the station, based on the specific characteristics of the fault and the operating and maintenance conditions. The station is completely autonomous. It can accumulate and transmit data. In comparison with the first prototypes, the noise characteristics of the station were significantly improved.","PeriodicalId":146873,"journal":{"name":"2018 XXIIIrd International Seminar/Workshop on Direct and Inverse Problems of Electromagnetic and Acoustic Wave Theory (DIPED)","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116919923","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 : 2015-09-01DOI: 10.1109/DIPED.2015.7324270
F. Bogdanov
This paper is dedicated to the memory of brilliant Georgian scientist, working in electrodynamics theory, Professor Guram Shalvovich Kevanishvili, who passed away in June 27, 2015, 2 days after his 86th birthday. The scientific interests of G. Sh., his main journal and conference papers and books have been listed and evaluated. His personal and scientific relations with other scientists and people, as well his life priorities are mentioned.
{"title":"In Memory of Prof. G. Sh. Kevanishvili","authors":"F. Bogdanov","doi":"10.1109/DIPED.2015.7324270","DOIUrl":"https://doi.org/10.1109/DIPED.2015.7324270","url":null,"abstract":"This paper is dedicated to the memory of brilliant Georgian scientist, working in electrodynamics theory, Professor Guram Shalvovich Kevanishvili, who passed away in June 27, 2015, 2 days after his 86th birthday. The scientific interests of G. Sh., his main journal and conference papers and books have been listed and evaluated. His personal and scientific relations with other scientists and people, as well his life priorities are mentioned.","PeriodicalId":146873,"journal":{"name":"2018 XXIIIrd International Seminar/Workshop on Direct and Inverse Problems of Electromagnetic and Acoustic Wave Theory (DIPED)","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126850228","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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