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2011 XXXth URSI General Assembly and Scientific Symposium最新文献

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Enhancing subspace-based inversions through an efficient multi-scaling scheme 通过高效的多尺度方案增强基于子空间的反演
2011 XXXth URSI General Assembly and Scientific Symposium Pub Date : 2011-10-20 DOI: 10.1109/URSIGASS.2011.6050367
G. Oliveri, Y. Zhong, Xudong Chen, A. Massa
{"title":"Enhancing subspace-based inversions through an efficient multi-scaling scheme","authors":"G. Oliveri, Y. Zhong, Xudong Chen, A. Massa","doi":"10.1109/URSIGASS.2011.6050367","DOIUrl":"https://doi.org/10.1109/URSIGASS.2011.6050367","url":null,"abstract":"A microwave imaging approach based on the integration of a subspace-base optimization method (SOM) and a multi-focusing procedure is proposed. The scattering equations are expressed within the contrast source formulation of the electromagnetic inverse problem and then solved by a nested procedure which includes an outer multi-resolution loop (dealing with the identification of the regions of interest), a spectrum analysis step (devoted to the reconstruction of the ‘deterministic’ components of the contrast sources) and an inner optimization loop (aimed at the retrieval of their ‘ambiguous’ parts). A numerical analysis is presented to preliminarily assess the features of the proposed approach.","PeriodicalId":325870,"journal":{"name":"2011 XXXth URSI General Assembly and Scientific Symposium","volume":"162 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-10-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114362230","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}
引用次数: 0
A digital time scale at the National Institute for Standards and Technology 国家标准与技术研究所的数字时间标度
2011 XXXth URSI General Assembly and Scientific Symposium Pub Date : 2011-10-20 DOI: 10.1109/URSIGASS.2011.6050278
S. Romisch, S. Jefferts, T. Parker
{"title":"A digital time scale at the National Institute for Standards and Technology","authors":"S. Romisch, S. Jefferts, T. Parker","doi":"10.1109/URSIGASS.2011.6050278","DOIUrl":"https://doi.org/10.1109/URSIGASS.2011.6050278","url":null,"abstract":"A novel, all-digital measurement system has been developed at the National Institute of Standards and Technology (NIST) as an alternative to the traditional analog approach to measuring time differences between the outputs of atomic standards used in the implementation of an ensemble time scale. The novel approach has been demonstrated viable for time scale applications and we are now working toward a full implementation of the system in an all-digital time scale.","PeriodicalId":325870,"journal":{"name":"2011 XXXth URSI General Assembly and Scientific Symposium","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-10-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114472700","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}
引用次数: 1
Results from development of methods for mitigating the impact of tropical rain attenuation on millimeter-wave broadband wireless access 减轻热带雨衰减对毫米波宽带无线接入影响的方法发展结果
2011 XXXth URSI General Assembly and Scientific Symposium Pub Date : 2011-10-20 DOI: 10.1109/URSIGASS.2011.6050681
G. Hendrantoro, Suwadi, Endroyono, A. Mauludiyanto
{"title":"Results from development of methods for mitigating the impact of tropical rain attenuation on millimeter-wave broadband wireless access","authors":"G. Hendrantoro, Suwadi, Endroyono, A. Mauludiyanto","doi":"10.1109/URSIGASS.2011.6050681","DOIUrl":"https://doi.org/10.1109/URSIGASS.2011.6050681","url":null,"abstract":"This paper provides a report on a continuing research project on the development of rain attenuation mitigation techniques for millimeter-wave wireless access to be implemented in tropical regions characterized by heavy rain events. The study is divided into three facets, namely, modeling of rain attenuation, designing of adaptive mitigation schemes, and cross-layer optimization of millimeter-wave broadband access network. The reported results are those obtained since 2009 comprising progresses in the three facets.","PeriodicalId":325870,"journal":{"name":"2011 XXXth URSI General Assembly and Scientific Symposium","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-10-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114590752","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}
引用次数: 1
Location and density determination for a source with impulse derivative time variation 脉冲导数随时间变化的源的定位和密度测定
2011 XXXth URSI General Assembly and Scientific Symposium Pub Date : 2011-10-20 DOI: 10.1109/URSIGASS.2011.6050372
M. Idemen, A. Alkumru
{"title":"Location and density determination for a source with impulse derivative time variation","authors":"M. Idemen, A. Alkumru","doi":"10.1109/URSIGASS.2011.6050372","DOIUrl":"https://doi.org/10.1109/URSIGASS.2011.6050372","url":null,"abstract":"In this study an inverse source problem related to the source density f<inf>0</inf> (x) which is a function of bounded support and taking place in the wave equation Δu(x, t) − (1/c<sup>2</sup>) ∂<sup>2</sup> u(x, t) / ∂t<sup>2</sup> = − f<inf>0</inf> (x)δ'(t) is considered. An explicit expression of the solution is given in terms of the surface integral of the data which is measured on the boundary S of a convex domain D during certain finite time interval [0, T]. An illustrative example shows the applicability as well as the effectiveness of the method.","PeriodicalId":325870,"journal":{"name":"2011 XXXth URSI General Assembly and Scientific Symposium","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-10-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122130715","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}
引用次数: 0
Modeling ionospheric propagation of low frequency signals for remote sensing purposes using charge density profiles 利用电荷密度剖面模拟遥感用低频信号的电离层传播
2011 XXXth URSI General Assembly and Scientific Symposium Pub Date : 2011-10-20 DOI: 10.1109/URSIGASS.2011.6050880
E. D. Schmitter
{"title":"Modeling ionospheric propagation of low frequency signals for remote sensing purposes using charge density profiles","authors":"E. D. Schmitter","doi":"10.1109/URSIGASS.2011.6050880","DOIUrl":"https://doi.org/10.1109/URSIGASS.2011.6050880","url":null,"abstract":"The use of powerful low or very low frequency (LF/VLF) transmitter signals (mainly in the range 15–60 kHz) is a well established technique for remote sensing of the lower ionosphere. Standard tools for calculating the the world wide propagation conditions — like the Long Wave Propagation Capability (LWPC) code — usually rely on default procedures for modeling the day-night transition conditions that do not map reality sufficiently for modeling purposes, especially with regard to timing and shape of the terminators. We propose an improved method to cover with these problems by making use of the possibility to introduce charge density profiles into the LWPC that vary appropriately over the day-night cycle and additionally can model disturbances caused by forcing of the lower ionosphere from above (X-rays, particle precipitations) and below (atmospheric waves).","PeriodicalId":325870,"journal":{"name":"2011 XXXth URSI General Assembly and Scientific Symposium","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-10-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122205795","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}
引用次数: 0
Epigenetic changes are induced following exposure of peripheral blood cells to CW 800MHz radiation 外周血细胞暴露于连续800MHz辐射后会引起表观遗传变化
2011 XXXth URSI General Assembly and Scientific Symposium Pub Date : 2011-10-20 DOI: 10.1109/URSIGASS.2011.6051342
R. Korenstein, R. Mazor, A. Barbul, A. Korenstein-Ilan
{"title":"Epigenetic changes are induced following exposure of peripheral blood cells to CW 800MHz radiation","authors":"R. Korenstein, R. Mazor, A. Barbul, A. Korenstein-Ilan","doi":"10.1109/URSIGASS.2011.6051342","DOIUrl":"https://doi.org/10.1109/URSIGASS.2011.6051342","url":null,"abstract":"Genetic and epigenetic changes are involved in initiation and progression of cancer. We exposed peripheral blood cells from young male volunteers to CW 800MHz radiation at SAR values of 2.9 and 4.1 W/kg for 24 hours (n=5) and 72 hours (n=10). Control experiments were carried out in the temperature range of 33.5–40°C. Epigenetic changes were monitored by analysis of FISH patterns of centromeres of chromosomes 11 and 17 reflecting alteration in their replication timing and synchrony. Our results demonstrate radiation induced non-thermal effect on the level of asynchronous replication in both chromosomes following exposure to the higher SAR level.","PeriodicalId":325870,"journal":{"name":"2011 XXXth URSI General Assembly and Scientific Symposium","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-10-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116603761","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}
引用次数: 0
Investigation of a time-variant dRET model in vegetation: XXIXth URSI general assembly to be held in Chicago, IL, USA, August 7–16, 2008 植被时变dRET模型的研究:第29届URSI大会将于2008年8月7-16日在美国芝加哥举行
2011 XXXth URSI General Assembly and Scientific Symposium Pub Date : 2011-10-20 DOI: 10.1109/URSIGASS.2011.6050852
Sergio Morgadinho, J. Richter, R. Caldeirinha, T. Fernandes
{"title":"Investigation of a time-variant dRET model in vegetation: XXIXth URSI general assembly to be held in Chicago, IL, USA, August 7–16, 2008","authors":"Sergio Morgadinho, J. Richter, R. Caldeirinha, T. Fernandes","doi":"10.1109/URSIGASS.2011.6050852","DOIUrl":"https://doi.org/10.1109/URSIGASS.2011.6050852","url":null,"abstract":"In this paper, the discrete Radiative Energy Transfer is investigated as an effective mean to model wind induced time-variant vegetative radio channels. The investigated model will make use of the input parameters time-variation properties to achieve channel dynamics modeling. Analysis of both the foliated channel statistics and model performance against measured data, at 20 GHz, will be presented.","PeriodicalId":325870,"journal":{"name":"2011 XXXth URSI General Assembly and Scientific Symposium","volume":"33 5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-10-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116748907","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}
引用次数: 1
A modification of the kummer's method for efficient computation of the 2-D Green's functions for 1-D periodic structures 对kummer方法的改进，使二维格林函数在一维周期结构中的有效计算
2011 XXXth URSI General Assembly and Scientific Symposium Pub Date : 2011-10-20 DOI: 10.1109/URSIGASS.2011.6050425
S. Skobelev
{"title":"A modification of the kummer's method for efficient computation of the 2-D Green's functions for 1-D periodic structures","authors":"S. Skobelev","doi":"10.1109/URSIGASS.2011.6050425","DOIUrl":"https://doi.org/10.1109/URSIGASS.2011.6050425","url":null,"abstract":"A new modification of the Kummer's method of Mth order for 2≤M≤6 is proposed for efficient computation of the 2-D Green's function for 1-D periodic structures in homogeneous media. The modification consists in transformation of the auxiliary series constructed of asymptotic terms of the original spectral series into a new series which, unlike the previous one, allows its summation in closed form. The new representation of the Green's functions consists of a rapidly converging difference series whose terms decay as q−(M+1), as well a new rigorous expression for the sum of the transformed auxiliary series.","PeriodicalId":325870,"journal":{"name":"2011 XXXth URSI General Assembly and Scientific Symposium","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-10-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117103388","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}
引用次数: 0
Scattered electromagnetic field variations due to building facade properties 建筑立面特性引起的散射电磁场变化
2011 XXXth URSI General Assembly and Scientific Symposium Pub Date : 2011-10-20 DOI: 10.1109/URSIGASS.2011.6051364
S. Mostarshedi, E. Richalot, M. Wong, J. Wiart, O. Picon
{"title":"Scattered electromagnetic field variations due to building facade properties","authors":"S. Mostarshedi, E. Richalot, M. Wong, J. Wiart, O. Picon","doi":"10.1109/URSIGASS.2011.6051364","DOIUrl":"https://doi.org/10.1109/URSIGASS.2011.6051364","url":null,"abstract":"A computation method based on the Green's functions associated with the interface between two semi-infinite media is used to obtain the scattered electric field in the near and far zones of a building. A simplified model taking account of the inhomogeneities on the building facade is considered. Different sources of uncertainty for the scattered electric field related to the building facade are presented, such as the main material property, the size, type and distribution of windows. An appropriate statistical distribution is attributed to each varying parameter and the influence on the scattered field from the facade is quantified.","PeriodicalId":325870,"journal":{"name":"2011 XXXth URSI General Assembly and Scientific Symposium","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-10-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117276304","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}
引用次数: 0
1/R2-Kernel cancelation in classical marching-on-in-time schemes 经典随时行进方案中的1/ r2核消去
2011 XXXth URSI General Assembly and Scientific Symposium Pub Date : 2011-10-20 DOI: 10.1109/URSIGASS.2011.6050377
A. Geranmayeh, W. Ackermann, T. Weiland
{"title":"1/R2-Kernel cancelation in classical marching-on-in-time schemes","authors":"A. Geranmayeh, W. Ackermann, T. Weiland","doi":"10.1109/URSIGASS.2011.6050377","DOIUrl":"https://doi.org/10.1109/URSIGASS.2011.6050377","url":null,"abstract":"Cancelation of 1/R2-associated integrals in the numerical solution procedure of the time-domain magnetic field integral equations are explained to halve the computational costs of the classical marching-on-in-time (MOT) schemes in which the delay time is approximated by the barycentric electric distance of the subdomain patches. The new technique improves the accuracy of the MOT as the resulting interpolation coefficients for the calculation of the impedance matrices became independent of the electrical distance of surface elements. Additionally, the analytical closed-form expressions for the evaluation of the remaining 1/R3-associated integrals allow the fast computation of the retarded matrices on demand. The applicability of the scheme to large-scale wave scattering problems is investigated.","PeriodicalId":325870,"journal":{"name":"2011 XXXth URSI General Assembly and Scientific Symposium","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-10-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128290018","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}
引用次数: 0
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