白井研究室の研究業績
2004年度(平成16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. 2004.8; H. Shirai, and H. Sekiguchi, "A Simple Crack Depth Estimation Method from Back Scattering Response," IEEE Trans. on Instrumentation and Measurement. vol.53, no.4, pp.1249-1254.
      [Abstract]: A depth estimation method for a crack on metal surfaces has been studied and a simple estimation formula and measurement method have been proposed. This formula is based on our previous theoretical analysis that the back scattering from a crack causes periodical nulls (dips) as the frequency changes, and the first dip occurs when the depth of the crack becomes nearly one-half the incident wavelength. Dependencies of the crack’s aperture and the incident angle have also been studied and considered as our depth estimation parameters. Test measurement has been made to check the validity of our estimation procedure.
    2. 2004.8; K. Shimezawa, H. Harada, and H. Shirai, "A New CDM Transmission Scheme with Cyclic Shifted-and-Extended Codes and a Cancellation Technique for Accumulated Cross-Correlation Values," IEICE Trans. Commun., vol.E87-B, no.8, pp.2212-2221.
      [Abstract]: We have developed a code-division-multiplexing (CDM) transmission scheme for future cellular communication systems, which uses cyclic shifted-and-extended (CSE) codes generated from an M-sequence to enable seamless communication in highly mobile environments. Because the correlation characteristics of CSE codes are determined by the M-sequence, the cross-correlation values are accumulated as a result of combining transmitted signals with opposite polarities in parallel channels. The accumulated cross-correlation values significantly degrade transmission performance, especially with multi-level modulation schemes such as quadrature amplitude modulation (QAM). We thus propose a cancellation technique to eliminate the accumulated cross-correlation values. We have evaluated the transmission performance of the CDM transmission scheme with the proposed technique by computer simulation. The new scheme enables high-quality data transmission in fast-fading environments.
    3. 2004.9; S. Mochizuki, S. Watanabe, M. Taki, Y. Yamanaka, and H. Shirai, "A New Iterative MoM/FDTD Formulation for Simulating Human Exposure to Electromagnetic Waves," IEICE Trans. on Elec., vol.E87-C, no.9, pp.1540-1547.
      [Abstract]: A new hybrid formulation has been derived for analyzing biological electromagnetic compatibility (Bio-EMC) problems by combining the frequency-domain Method of Moments (MoM) and the Finite-Difference Time-Domain (FDTD) method. This hybrid form is different from, and more direct than, the method previously proposed by Mangoud et al. Some numerical examples are given for the human head exposure field due to a half wavelength dipole and a one-wavelength loop antenna. Our iterative method is found to have fast convergence. In addition, our method works well for cases when the radiation antenna wires are not aligned with the FDTD lattice.

  2. 国際会議発表 等
    1. 2004. 5; S. Mochizuki, S. Watanabe, M. Taki, Y. Yamanaka and H. Shirai, "Validation of exposure evaluation based on numerical simulations for cellular-phone epidemiological study," Proc. of International Non-Ionizing Radiation Workshop & Symposium, Seville, Spain.
    2. 2004. 5; S. Mochizuki, S. Watanabe, M. Taki, Y. Yamanaka and H. Shirai, "A new hybrid MoM/FDTD method for antennas located off the Yee's lattice," Proc. of 2004 URSI International Symposium on Electromagnetic Theory, Pisa, Italy.
    3. 2004. 6; S. Watanabe, Y. Yamanaka, S. Mochizuki, H. Shirai, Y. Tanaka, M. Takahashi, T. Uno, J. Wang, O. Fujiwara and M. Taki, "Numerical Techniques of Realistic Modelings and of Large-Scale Simulation for Dosimetry of Human-Body Exposure to Radiofrequency Waves," Proc. of IEEE MTT-S International Microwave Symposium 2004, Fort Worth, Texas.
    4. 2004. 6; S. Mochizuki, S. Watanabe, M. Taki, Y. Yamanaka and H. Shirai, "A new iterative MoM/FDTD analysis for EM scattering by a loop antenna," Proc. of 2004 IEEE International Symposium on Antennas and Propagation and USNC/URSI National Radio Science Meeting, Monterey, CA.
    5. 2004. 6; R.Sato and H. Shirai, "Radio wave propagationanalysis for a simple indoor model," Proc. of 2004 IEEE International Symposium on Antennas and Propagation and USNC/URSI National Radio Science Meeting, Monterey, CA.
    6. 2004. 8; H. Shirai, S. Suzuki, K. Ono, "Cylindrical target reconstruction using their frequency and time domain RCS values," Proc. of 2004 International Symposium on Antennas and Propagation, Sendai, Japan.
    7. 2004. 8; Xiaoyi Cao, Mitsunori Makino, Hiroshi Shirai, and Shoji Shinoda, "An Adaptive Beam Division for a Visual Simulation of High Frequency Electromagnetic Wave Propagation" Proc. of The joint conference (APCC/MDMC'04) of 10th Asia-Pacific Conference on Communications (APCC2004) and 5th International Symposium on Multi-Dimensional Mobile Communications (MDMC2004)2004 International Symposium on Antennas and Propagation, Beijin, China.
    8. 2004. 8; M. Hanazawa, R. Kumahara, S. Mochizuki, K. Wake, S. Watanabe, M. Taki, Y. Kamimura, Y. Yamanaka, and H. Shirai, "Development of a Millimeter-Wave Exposure Setup for Rabbit Eyes," Proc. of 2004 Asia-Pacific Radio Science Conference, Qingdao, China, Aug. 2004.
    9. 2004. 9; K. Shimezawa, H. Harada, and H. Shirai, "Performance Evaluation of a CDM Transmission Scheme Based on Sequences with Zero Cross-correlation Characteristics," Proc. of the 7th International Symposium on Wireless Personal Multimedia Communications (WPMC '04), Abano Terme, Italy, Sept. 2004.
    10. 2004. 9; K. Shimezawa, H. Harada, and H. Shirai, "Cyclic Shifted-and-Extended Codes Based on Almost Perfect Autocorrelation Sequences for CDM Transmission Scheme," Proc. of the 60th IEEE Vehicular Technology Conference (VTC2004-fall), Los Angeles, USA, Sept. 2004.
    11. 2004. 9; M. Koshimizu, R. Funada, H. Harada, and H. Shirai, "A New Co-channel Estimation Method for the Downlink frame of DPC-OF/TDMA," Proc. of the 60th IEEE Vehicular Technology Conference (VTC2004-fall), Los Angeles, USA, Sept. 2004.
    12. 2004. 10; Y. Kunisawa, N. Sahara, H. Shirai, and H. Iwai, "Study on an Undersampling System for Multi-band Receivers," Proc. of Global Mobile Congress, Shanghai, China, Oct. 2004.

  3. 学会, 研究会発表 等
    1. 2004．4； 望月章志，渡辺聡一，多氣昌生，山中幸雄，白井宏， 「波源近傍電磁界による人体曝露量推定への数値混成解析手法適用に関する一検討」， 電気学会 電磁環境研究会 研究会資料 EMC--04--38，pp.35--40．
    2. 2004．6； 小清水克，船田龍平，原田博司，白井宏； 「下りリンクDPC-OF/TDMAにおける適応変調のための干渉推定方式に関 する一検討」， 電気情報通信学会 無線通信システム研究会 研究会資料RCS-06-18．
    3. 2004．6； 熊原亮，望月章志，花澤理宏，和氣加奈子，渡辺聡一，多氣昌生，上村佳嗣，白井宏， 「60GHz帯家兎眼ばく露装置の近傍界特性」， 電子情報通信学会 環境電磁工学研究会 研究会資料 EMCJ2004--23，pp.53--60．
    4. 2004．6； 今野豪，望月章志，花澤理宏，和氣加奈子，渡辺聡一，多氣昌生，白井宏， 「ミリ波帯電波の温感特性に関する基礎検討」， 電子情報通信学会 環境電磁工学研究会 研究会資料 EMCJ2004--24，pp.61--66．
    5. 2004．7； 望月章志，和氣加奈子，渡辺聡一，山中幸雄，白井宏，多氣昌生， 「疫学調査のための曝露評価指標に関する検討」， 電子情報通信学会 環境電磁工学研究会 研究会資料 EMCJ2004--37，pp.1--4．
    6. 2004．9； 鈴木雅史，白井宏，平松義範， 「曲面を含む柱状散乱体の形状推定について」， 電子情報通信学会 電磁界理論研究会 研究会資料 EMT--04--89，pp.99--104．
    7. 2004．11； 示沢寿之，原田博司，白井宏； 「ゼロ相互相関特性を有する巡回シフト巡回拡張型符号を用いた符号分割多重伝送」， 電子情報通信学会 無線通信システム研究会，RCS2004-211，pp.1-6．
    8. 2005．1； 佐藤亮一，佐藤寛，白井宏； 「光線追跡法を用いた簡易室内モデルの電磁波伝搬解析」， 電子情報通信学会 電磁界理論研究会，EMT-05-8，pp.41-46．
    9. 2005．1； 大久潤，白井宏，望月章志； 「頭部局所曝露におけるFDTDセルサイズの依存性に関する一検討」， 電子情報通信学会 電磁界理論研究会，EMT-05-10，pp.53-58．
    10. 2005．1； 今野豪，熊原亮，花澤理宏，和氣加奈子，渡辺聡一，徳永類，鈴木敬久，多氣昌生，白井宏； 「レンズアンテナを用いたミリ波曝露装置の開発」， 電子情報通信学会 環境電磁工学研究会 研究会資料 EMCJ2005，pp.77-82
    11. 2005．1； 佐原直宏，國澤良雄，岩井誠人，白井宏； 「アンダーサンプリングにおけるサンプリング周波数選択方法の検討」， 電子情報通信学会 無線通信システム研究会 研究会資料，RCS2004-251，pp.91-96．
    12. 2005．3； 小清水克，神山真彦，船田龍平，原田博司，白井宏； 「下りリンクDPC-OF/TDMAにおけるセル選択法に関する一検討」， 電子情報通信学会，2005年総合大会，CDROM．
    13. 2005．3； 平松義範，鈴木雅史，日高史智，白井宏； 「柱状散乱体の曲面部の推定について」， 電子情報通信学会，2005年総合大会，CDROM．
    14. 2005．3； 中田優，今野豪，熊原亮，望月章志， 花澤理宏，和氣加奈子，渡辺聡一，白井宏； 「30GHz帯家兎眼曝露装置のリターンロス特性」， 電子情報通信学会，2005年総合大会，CDROM．
    15. 2005．3； 佐藤 寛，佐藤亮一，白井宏； 「光線追跡法を用いた室内電磁波伝搬に関する一考察」， 電子情報通信学会，2005年総合大会，CDROM．

  4. その他
    1. 2004.5; 白井 宏； 「不思議な電波の話」愛知県立成章高等学校 特別講義
    2. 2004.12; 白井 宏； 「君には携帯電話の電波が見えるか？」千葉県立長生高等学校 特別講義