Atsushi YAMAMOTO


A Spatial Fading Emulator for Evaluation of MIMO Antennas in a Cluster Environment
Tsutomu SAKATA Atsushi YAMAMOTO Koichi OGAWA Hiroshi IWAI Jun-ichi TAKADA Kei SAKAGUCHI 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2014/10/01
Vol. E97-B  No. 10  pp. 2127-2135
Type of Manuscript:  Special Section PAPER (Special Section on Recent Progress in Measurement and Design Techniques on Antennas, Propagation and Wireless Systems)
Category: 
Keyword: 
fading emulatorclusterangular power spectrumOTAhandset antennaMIMOchannel capacity
 Summary | Full Text:PDF(2.4MB)

Performance Evaluation of Spatial Correlation Characteristics for Handset Antennas Using Spatial Fading Emulator Based on Clarke's Model
Hiroshi IWAI Kei SAKAGUCHI Tsutomu SAKATA Atsushi YAMAMOTO 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2010/10/01
Vol. E93-B  No. 10  pp. 2514-2522
Type of Manuscript:  Special Section PAPER (Special Section on Advanced Technologies in Antennas and Propagation in Conjunction with Main Topics of ISAP2009)
Category: Mobile Propagation
Keyword: 
spatial fading emulatorspatial correlation characteristicmulti-path propagation environmenthandset antennasscatterers
 Summary | Full Text:PDF(1.6MB)

Empirical Investigation of the LOS Propagation Characteristics on an Undulating Road for Millimeter Wave Inter-Vehicle Communication
Atsushi YAMAMOTO Koichi OGAWA Hiroshi SHIRAI 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2007/09/01
Vol. E90-C  No. 9  pp. 1807-1815
Type of Manuscript:  Special Section PAPER (Special Section on Microwave and Millimeter-Wave Technology)
Category: Antennas/Systems
Keyword: 
ITSinter-vehicle communicationsLOSroad undulation
 Summary | Full Text:PDF(1.1MB)

3-D Angular Spectrum Measurements at 5 GHz in a Residential Two-Story House
Hiroshi IWAI Tsutomu SAKATA Atsushi YAMAMOTO Kei SAKAGUCHI 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2007/09/01
Vol. E90-B  No. 9  pp. 2344-2351
Type of Manuscript:  Special Section PAPER (Special Section on 2006 International Symposium on Antennas and Propagation)
Category: Propagation
Keyword: 
3-D angular spectrumresidential housepropagationMIMOchannel capacity
 Summary | Full Text:PDF(2MB)

Equivalent Circuit Analysis for Time-Coordinated Non-arcing Operation of Reed Switches
Noboru WAKATSUKI Yu YONEZAWA Atsushi YAMAMOTO 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2006/08/01
Vol. E89-C  No. 8  pp. 1182-1186
Type of Manuscript:  Special Section PAPER (Special Section on Recent Development of Electromechanical Devices (Selected Papers from IS-EMD2005))
Category: Relays & Switches
Keyword: 
reed switcharc discharge suppressionarc ignitionmechanical contactsrelay
 Summary | Full Text:PDF(849.3KB)

Attenuation Characteristics of the SAR in a COST244 Phantom with Different EM Source Locations and Sizes
Shoichi KAJIWARA Atsushi YAMAMOTO Koichi OGAWA Akihiro OZAKI Yoshio KOYANAGI 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2005/06/01
Vol. E88-B  No. 6  pp. 2391-2400
Type of Manuscript:  Special Section PAPER (Special Section on 2004 International Symposium on Antennas and Propagation)
Category: 
Keyword: 
SARattenuation characteristicCOST244 phantomlossy mediumspatial spread of energy
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A Low-Profile Bi-Directional Cavity Antenna with Broadband Impedance Characteristics
Atsushi YAMAMOTO Hiroshi IWAI Toshimitsu MATSUYOSHI Koichi OGAWA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2001/09/01
Vol. E84-B  No. 9  pp. 2490-2497
Type of Manuscript:  Special Section PAPER (Special Issue on Innovation in Antennas and Propagation for Expanding Radio Systems)
Category: Mobile Antennas
Keyword: 
bi-directional radiation patterncavity antennaIMT-2000picocell base station
 Summary | Full Text:PDF(756KB)

A Flexible Learning Algorithm for Binary Neural Networks
Atsushi YAMAMOTO Toshimichi SAITO 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 1998/09/25
Vol. E81-A  No. 9  pp. 1925-1930
Type of Manuscript:  PAPER
Category: Neural Networks
Keyword: 
binary neural networksboolean functionsupervised learningmulti-layer perceptronfunction approximation
 Summary | Full Text:PDF(427.6KB)