Akimasa HIRATA


Averaging Area of Incident Power Density for Human Exposure from Patch Antenna Arrays
Daisuke FUNAHASHI Takahiro ITO Akimasa HIRATA Takahiro IYAMA Teruo ONISHI 
Publication:   
Publication Date: 2018/08/01
Vol. E101-C  No. 8  pp. 644-646
Type of Manuscript:  BRIEF PAPER
Category: 
Keyword: 
5th generation wireless systempatch antenna arraysafety standardsincident power densityRF exposure
 Summary | Full Text:PDF(888KB)

Magnetic Field Measurement for Human Exposure Assessment near Wireless Power Transfer Systems in Kilohertz and Megahertz Bands
Satoshi ISHIHARA Teruo ONISHI Akimasa HIRATA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2015/12/01
Vol. E98-B  No. 12  pp. 2470-2476
Type of Manuscript:  PAPER
Category: Electromagnetic Compatibility(EMC)
Keyword: 
wireless power transfer (WPT)information household appliancemeasurement methodnear field magnetic fieldhuman exposure
 Summary | Full Text:PDF(1.7MB)

Quasistatic Approximation for Exposure Assessment of Wireless Power Transfer
Ilkka LAAKSO Takuya SHIMAMOTO Akimasa HIRATA Mauro FELIZIANI 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2015/07/01
Vol. E98-B  No. 7  pp. 1156-1163
Type of Manuscript:  INVITED PAPER (Special Section on Electromagnetic Compatibility Technology in Conjunction with Main Topics of EMC'14/Tokyo)
Category: 
Keyword: 
wireless power transferhuman exposuredosimetry
 Summary | Full Text:PDF(2.2MB)

Evaluation of SAR and Temperature Elevation Using Japanese Anatomical Human Models for Body-Worn Devices
Teruo ONISHI Takahiro IYAMA Lira HAMADA Soichi WATANABE Akimasa HIRATA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2010/12/01
Vol. E93-B  No. 12  pp. 3643-3646
Type of Manuscript:  LETTER
Category: Electromagnetic Compatibility(EMC)
Keyword: 
10 g average SARTemperature elevationBody-worn devicesJapanese anatomical human modelsFDTD methodBio-heat equation
 Summary | Full Text:PDF(216.7KB)

Quasi-Static FDTD Method for Dosimetry in Human due to Contact Current
Akimasa HIRATA Yukinori TAKANO Toshihiro NAGAI 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2010/01/01
Vol. E93-C  No. 1  pp. 60-65
Type of Manuscript:  Special Section PAPER (Special Section on Recent Progress in Electromagnetic Theory and Its Application)
Category: 
Keyword: 
quasi-static finite-difference time-domain methodcontact currentdosimetry
 Summary | Full Text:PDF(1.2MB)

Nonlinear Analysis of DBR Chrenkov Laser via Particle Simulation
Akimasa HIRATA Toshiyuki SHIOZAWA 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2000/12/25
Vol. E83-C  No. 12  pp. 1917-1922
Type of Manuscript:  PAPER
Category: Electromagnetic Theory
Keyword: 
Cherenkov laserparticle simulationFDTD methoddistributed Bragg reflector
 Summary | Full Text:PDF(391KB)

Calculation of Temperature Rises in the Human Eye Exposed to EM Waves in the ISM Frequency Bands
Akimasa HIRATA Gou USHIO Toshiyuki SHIOZAWA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2000/03/25
Vol. E83-B  No. 3  pp. 541-548
Type of Manuscript:  Special Section PAPER (Special Issue on Recent Progress in Electromagnetic Compatibility Technology)
Category: EMC Simulation
Keyword: 
FDTD methodhuman eyeISM frequency bandsspecific absorption rate (SAR)temperature rise
 Summary | Full Text:PDF(748.1KB)

Efficiency Enhancement in a Rectangular Cherenkov Laser by a Proper Variation of Dielectric Permittivity in the Transverse Direction
Sirou HIROSAKA Akimasa HIRATA Toshiyuki SHIOZAWA 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 1999/11/25
Vol. E82-C  No. 11  pp. 2108-2109
Type of Manuscript:  LETTER
Category: Electromagnetic Theory
Keyword: 
Cherenkov lasertransverse permittivity variationefficiency enhancementparticle simulation
 Summary | Full Text:PDF(267.2KB)

A Compact Smith-Purcell Free-Electron Laser with a Bragg Cavity
Tipyada THUMVONGSKUL Akimasa HIRATA Toshiyuki SHIOZAWA 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 1999/11/25
Vol. E82-C  No. 11  pp. 2094-2100
Type of Manuscript:  PAPER
Category: Electromagnetic Theory
Keyword: 
Bragg cavitycompact lasershigh-power lasersmetallic gratingsSmith-Purcell FEL
 Summary | Full Text:PDF(579.1KB)

Efficiency Enhancement in a Cherenkov Laser by a Proper Variation of Dielectric Thickness
Akimasa HIRATA Yoshio YUSE Toshiyuki SHIOZAWA 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 1998/11/25
Vol. E81-C  No. 11  pp. 1764-1765
Type of Manuscript:  LETTER
Category: Opto-Electronics
Keyword: 
Cherenkov laserdielectric thickness variationefficiency enhancementparticle simulation
 Summary | Full Text:PDF(155.1KB)