白井研究室の研究業績
2005年度(平成17年度)


白井研究室で行われた研究のうち，論文等の形で学術論文誌等に公表されたものを紹介します.
  1. 論文 等
    1. 2005.11; Y. Kunisawa, N. Sahara, H. Shirai, and H. Iwai: "A New Sampling Frequency Selection Scheme in Undersampling Systems," IEICE Trans. Commun., Vol.E88-B, No.11, pp.4170-4175, November 2005.
      [Abstract]: In software defined radio systems, placing the analog-todigital converter (ADC) near the antenna part in the block diagram of the receiver is desired to improve the flexibility of the system. The radio frequency (RF) sampling method, in which the received signal is sampled at the RF stage, realizes such structure. The undersampling is a potential method to sample the RF signal using the existing consumer ADCs because high speed ADCs are required in the traditional methods, such as Nyquist sampling or the oversampling of the RF signal. This paper presents a technique to determine the minimum sampling frequency to undersample the separated multiple wireless systems simultaneously. In addition, this paper proposes a frequency selecting scheme that enables selection of a lower sampling frequency by receiving at least the desired transmission channels in the wireless system signals. This paper also provides a result of performance analysis of the proposed scheme.
    2. 2005.12; H. Shirai, Y. Hiramatsu, and M. Suzuki, "Reconstruction of Polygonal Cylindrical Targets with Curved Surfaces from Their Monostatic RCS," IEICE Trans. Electronics., Vol. E88-C, No.12, pp.2289-2294, December 2005.
      [Abstract]: Target reconstruction algorithm from its monostatic radar cross section (RCS) has been proposed for polygonal cylinders with curved surfaces. This algorithm is based on our previous finding that the main contribution to the back scattering is due to edge diffracted fields excited at a facet of nearly specular reflection direction. Dimension of this constitutive facet of the target is estimated from the local maxima and its lobe width in the angular RCS variation. Half and quarter circular cylinders are used as canonical scattering objects, and their measured and numerically simulated monostatic RCS values have been studied extensively to find scattering pattern characteristic difference between flat and circularly curved surfaces. Thus estimated constitutive facets are connected in order, and this procedure will be continued until the distance between the first and the final edges would be minimized. Our algorithm has been tested for other targets, and it is found that it works well for predicting metal convex targets with flat and curved facets.

  2. 国際会議発表 等
    1. 2005. 4; R. Sato, H. Sato, and H. Shirai, "A SBR algorithm for simple indoor propagation estimation," Proc. of 2005 IEEE/ACES International Cenference on Wireless Communications and Applied Computational Electromagnetics, (CDROM) HI, USA.
    2. 2005. 6; T. Konno, M. Hanazawa, K. Wake, S. Watanabe, M. Taki, and H. Shirai, "Frequency Characteristics of Power Absorption and of Temperature Elevation for Human Exposure to Millimeter Wave," Proc. of 2005 Bioelectromagnetics Meeting, CDROM, Dublin, Ireland.
    3. 2005. 6; M. Hanazawa, T. Konno, R. Kumahara, K. Wake, S. Watanabe, M. Taki, and H. Shirai "Antenna Measurement for Millimeter-Wave Exposure Setup," Proc. of 2005 Bioelectromagnetics Meeting, CDROM, Dublin, Ireland.
    4. 2005. 7; R. Sato, H. Sato, and H. Shirai, "A SBR estimation for indoor wave propagation through dielectric walls," Proc. of 2005 IEEE International Symposium on Antennas and Propagation and USNC/URSI National Radio Science Meeting, CDROM Washington DC, USA.
    5. 2005. 8; H. Shirai, Y. Hiramatsu, and M. Suzuki, "Reconstruction of polygonal cylindrical targets with curved surfaces from their RCS values," Proc. of 2005 International Symposium on Antennas and Propagation, Seoul Korea.
    6. 2005. 8; H. Shirai, "Cylindrical target reconstruction using RCS values," Proc. of 2005 Progress in Electromagnetics Research Symposium, Hangzhou China.
    7. 2005. 9; H. Shirai, "Electromagnetic wave propagation estimation for wireless communication system," Proc. of 2005 International Conference on Electromagnetics in Advanced Applications (ICEAA05), Torino, Italy.
    8. 2005. 9; S. Watanabe, S. Mochizuki, and H. Shirai, "Application of a MoM/FDTD-hybrid method to scattering problems including complex-shape antennas," Proc. of EMC Europe Workshop 2005, Rome, Italy.
    9. 2005. 9; K. Shimezawa, H. Harada, and H. Shirai, "Impact of the Gain/Phase imbalance between I and Q channels for the DPC-OF/TDMA system," Proc. of 8th International Symposium on Wireless Personal Multimedia Communications (WPMC '05), Denmark.
    10. 2005. 10; H. Shirai, and Y. Hiramatsu, "Reconstruction of cylindrical metal targets using their Frequency and time domain RCS values," Proc. of XXVIII-th General Assembly of International Union of Radio Science, Delhi, India.
    11. 2005. 10; T. Konno, M. Hanazawa, S. Watanabe, M. Taki, and H. Shirai, "A Study of Warmth Sensation Produced by Millimeter Wave Exposure," Proc. of XXVIII-th General Assembly of International Union of Radio Science, Delhi, India.
    12. 2006. 3; H. Shirai, J. Ohisa, S. Mochizuki "A study on FDTD cell size for evaluating human head exposure to near EM field," Proc. of 2006 ACES Conferences on Applied Computational Electromagnetics, (CDROM) FL, USA.

  3. 学会, 研究会発表 等
    1. 2005．5； 平松 義範，白井 宏，鈴木 雅史，日高 史智， 「散乱体表面の多角柱近似に基づく曲面推定」， 電子情報通信学会 電磁界理論研究会 研究会資料 EMT-05-23，pp.59-64．
    2. 2005．5； 牧野光則，曹 暁逸，白井宏，篠田 庄司， 「3次元立体視装置を用いた都市空間中の対話的電磁波伝搬の可視化について」， 電子情報通信学会 電磁界理論研究会 研究会資料 EMT-05-24，pp.65-70．
    3. 2005．9； 今野 豪，花澤 理宏，和氣 加奈子，渡辺 聡一，多氣 昌生，白井 宏， 「ミリ波帯電波における温熱知覚閾値の測定」， 電子情報通信学会，2005年ソサイエティ大会，B-4-50．
    4. 2005．9； 平松 義範，白井 宏， 「高周波近似による柱状散乱体の曲面推定−推定精度の周波数による変化−」， 電子情報通信学会，2005年ソサイエティ大会，C-1-8．
    5. 2005．9； 佐藤 亮一, 佐藤 寛, 白井 宏, 「室内伝搬特性に対する壁内部の多重反射の効果について」， 電子情報通信学会，2005年ソサイエティ大会，CS-1-5．
    6. 2005．9； 今野 豪，花澤 理宏，和氣 加奈子，渡辺 聡一，多氣 昌生，白井 宏， 「ミリ波帯電波における温熱知覚閾値の測定」， URSI-K ワークショップ「ミリ波・テラヘルツ波と生体」．
    7. 2005．11； 平松 義範，白井 宏， 「高周波近似による柱状散乱体の曲面推定−曲率が変化する場合−」， 電気学会 電磁界理論研究会 研究会資料 EMT-05-67，pp.37-42．
    8. 2006．2； 白井 宏， 「レーダ散乱断面積を用いた物体の形状認識について」（招待講演）， 第489回伝送工学研究会, 東北大学（予稿集なし）．
    9. 2006．3； 今野 豪， 「ミリ波帯電波の温熱知覚特性に関する研究」， 2005 年度 NICT共同研究・研修生研究発表会，情報通信研究機構(NICT）小金井本部6号館1階会議室．

  4. その他
    1. 2005.11; 白井 宏； 「君には携帯電話の電波が見えるか？」富士見高等学校 特別講義