白井研究室の研究業績
2010年度(平成22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. 著書
    1. 2010. 6. 30; 宇野 亨, 白井 宏,「電磁気学」, 415p, コロナ社
  2. 論文 等
    1. 2010. 5 Akio Kanezaki，Akimasa Hirata, Soichi Watanabe, H. Shirai； "Parameter Variation Effects on Temperature Elevation in a Steady-state, One-dimensional, Thermal Model for Millimeter Wave Exposure of One- and Three-layer Human Tissue," Physics in Medicine and Biology, Vol. 55, pp.4647--4659, 2010.
      [Abstract]: The present study describes theoretical parametric analysis of the steady state temperature elevation in one-dimensional three-layer (skin, fat, and muscle) and one-layer (skin only) models due to millimeter-wave exposure. The motivation of this fundamental investigation is that some variability of warmth sensation in the human skin has been reported. An analytical solution for a bioheat equation was derived by using the Laplace Transform for the one-dimensional human models. Approximate expressions were obtained to investigate the dependence of temperature elevation on different thermal and tissue thickness parameters. It was shown that the temperature elevation on the body surface decreases monotonically with the blood perfusion rate, heat conductivity, and heat transfer from the body to air. Also revealed were the conditions where the maximum and minimum surface temperature elevations were observed for different thermal and tissue thickness parameters. The surface temperature elevation in the three-layer model is 1.3-2.8 times greater than that in the one-layer model. The main reason for this difference is attributed to adiabatic nature of fat layer. By considering variation range of thermal and tissue thickness parameters which causes the maximum and minimum temperature elevations, the dominant parameter influencing the surface temperature elevation was found to be the heat transfer coefficient between the body surface and air.
    2. 2010. 1.1. Ryoichi Sato, H. Shirai； "Modification of Ray-launching Method For Accurate 2D Indoor Propagation Analysis," IEICE Trans. Electronics., Vol.E94-C, No.1, pp.55-58, 2011
      [Abstract]: This paper presents an efficient ray-launching method for 2D indoor propagation problem, by including crucial multiple reflection effect inside wall. We here focus on the derivation of the reflected and transmitted ray solutions at/through wall when a magnetic source is located in the indoor environment. An efficient approximation, which is called collective ray approximation, is carried out to bundle or collect the internal multiple reflected rays into the primary one. It is resultantly confirmed from the detailed numerical experiments that the derived collective ray solutions can be confidently effective when the internal reflections strongly contribute to the propagation characteristic in the propagation environment, regardless of angle of the incidence.

  3. 国際会議発表 等
    1. 2010.7; M. Ishikawa and H. Shirai, "Complex Permittivity Estimation by Free Space Method Using Specular Reflected RCS," Proc. of 2010 Progress In Electromagnetics Research Symposium in Cambridge (PIERS 2010 in Cambridge), CDROM Cambridge, MA, USA.
    2. 2010.7; R. Sato and H. Shirai, "Propagation Analysis for a Simplified Indoor/outdoor Interface Model," Proc. of 2010 IEEE International Symposium on Antennas and Propagation and USNC/URSI National Radio Science Meeting, CDROM, Toronto, Canada.
    3. 2010. 8; H. Shirai and M. Ishikawa, "Complex Permittivity Estimation by Free Space RCS Measurement," Proc. of the Third International Conference on Communications and Electronics (HUT-ICCE2010), CDROM, Nha Trang, Vietnam.
    4. 2010.9; R. Sato and H. Shirai, "Electromagnetic Plane Wave Diffraction by a Wide Slit on Conducting Plane with Finite Thickness," Proc. of 2010 Asia Pacific Radio Science Conference (APRASC 2010), CDROM, Toyama, Japan.
    5. 2011. 1; M. Hagiwara, T. Kitayabu, H. Ishikawa, and H. Shirai, "Delta-Sigma Modulator with Non-Uniform Quantization,” Proc. of 2011 IEEE Radio and Wireless Symposium, CDROM, Jan. USA.
    6. 2011. 3; H. Shirai and J. Ohisa, "FDTD Cell Size Study for SAR Evaluation for Human Head Exposure to Near EM Field," Proc. of 2011 Progress In Electromagnetics Research Symposium in Cambridge (PIERS 2011 in Marrakesh), CDROM Marrakesh, Morocco.
  4. 学会, 研究会発表 等
    1. 2010. 11; 石井 純司，白井 宏, "人体電磁波曝露解析に伴う人体モデルの量子化についての検討,"電気学会電磁界理論研究会, EMT-10-111.
    2. 2010. 11; 李 裕鎮，白井 宏, "Changes in Field Uniformity Characteristics of a Reverberation Chamber with Transmitting Antenna Direction," 電気学会 電磁界理論研究会, EMT-10-132.
    3. 2011. 1; 松田 知紘, 酒井 泰司, 和氣 加奈子, 渡辺 聡一, 白井　宏, 平田 晃正, 佐々木 謙介, 鈴木 敬久, "ミリ波帯電波曝露時の家兎眼温度上昇に関する検討," 信学技報, vol. 110, no. 402, EMCJ2010-118, pp. 109-114.

  5. その他