Nagata-cho, Chiyoda-ku, Tokyo, 100–6150 Japan ††† DoCoMo Communications Laboratories Europe GmbH Lardsberger Strasse, 308–312, 80687, Munich, Germany ユーザの移動につれて変わるネットワーク環境をユー ザに意識させることなく,それぞれの環境に適した通 信サービスを切れ目なく提供できるような能力が求め られる.本論文では,ユーザの移動に起因して発生す る,通信サービス提供を疎外する様々な事象を “継ぎ 目”(シーム:seam)と呼び,それらを隠ぺいしなが ら継続的に提供される通信サービスをシームレス通信 サービスと呼ぶ. 本論文の目的は,シームレス通信サービスの要求条 件を明確にし,その実現技術の研究動向を示すことに ある.本論文は,以下の...

SEARCH. T. Satoh, T. Kubota, K. Fujita, T. Okada, T. Iwata, T. Imamura, A. Oyama, N. Ogawa, K. Yamada (Japan Aerospace Exploration Agency), H. Miyamoto (University of Tokyo), A. Yamagishi (Tokyo University of Life and Pharmacy), G. Komatsu (IRSPS), T. Usui (Tokyo Institute of Technology), G. L. Hashimoto (Okayama University), H. Demura (Aizu University), H. Senshu (Chiba Institute of Technology...

M. Yamada, S. Momoshima, Y. Masutani, K. Fujiyoshi, K. Hikishima, O. Abe, M. Nakamura, S. Aoki, N. Tamaoki, and H. Okano School of Health Sciences, Fujita Health University, Toyoake, Aichi, Japan, Imaging Analysis Laboratory, Central Institute for Experimental Animals, Kawasaki, Kanagawa, Japan, School of Medicine, Keio University, Shinjuku-ku, Tokyo, Japan, School of Medicine, University of To...

Faculty of Engineering Yokohama National University, 79–5 Tokiwadai, Hodogaya-ku, Yokohama 240–8501, Japan, Graduate School of Environment and Information Sciences, Yokohama National University, 79–7 Tokiwadai, Hodogaya-ku, Yokohama 240–8501, Japan, and Graduate School of Pharmaceutical Sciences, Kyushu University, 3–1–1 Maidashi, Higashiku, Fukuoka 812–8582, Japan (Received March 15, 2002; Acc...

原稿受付 2003年 7月 1日 キーワード:Spherical Motor, Actuator, Multi DOF, Ultrasonic Motor ∗1〒 305–8564 つくば市並木 1–2–1 ∗2〒 223–8522横浜市港北区日吉 3–14–1 ∗1Tsukuba–shi, Ibaraki ∗2Kohoku–ku, Yokohama–shi, Kanagawa 矢野らは,立体的に配置した 3組の巻線に流す正弦波電 流の振幅と位相差を変えることにより回転磁界の回転軸を 三次元空間内の任意の方向に制御できることを示し,ロー タを永久磁石にすれば球面同期モータ,ロータをコイルに すれば球面誘導モータが実現できると提案した [2].これら モータの試作機はロータ支持にジンバル機構を,位置計測 にはジンバル機構に取り付けた 1軸のポテンショメータも しくはエンコーダを用いてい...

1 Physics Department, Indiana University-Purdue University Indianapolis, Indianapolis, IN, 46202, United States of America 2 Research Institute for Electronic Science, Hokkaido University, Kita 20 Nishi 10, Kita-Ku, Sapporo 001-0020 Japan 3 Department of Chemistry and Chemical Biology, Indiana University-Purdue University Indianapolis, Indianapolis, IN, 46202, United States of America 4 Departm...

A 32-GHz (Ka-band) breadboard has been developed to demonstrate M -ary phase-shift keyed (PSK) and M -ary quadrature amplitude modulation (QAM) Ka-band modulations using a ×3 8-GHz (X-band) architecture. This breadboard consists of an X-band vector modulator that is driven by a field programmable gate array. The signal is mixed with an upconverted 24-GHz signal to give the Ka-band modulated out...

Ka-band (32-GHz) radio communication links are more adversely affected by atmospheric noise temperature than X-band (8.4-GHz) or S-band (2.9-GHz) links. As a result, the strategy for telecommunications between a spacecraft employing Ka-band and the Deep Space Network is necessarily different from that employed at the lower frequencies. To aid in the development of new communication strategies, ...