Koichi OGAWA


A Method of Reducing the Internal Interference Noise in Intra-EMC Using Decoupling Techniques
Tomoya MAEKAWA Kazuhiro HODNA Kun LI Koichi OGAWA 
Publication:   - - Abstracts of (Japanese Edition)
Publication Date: 2017/08/01
Vol. J100-B  No. 8  pp. 575-579
Type of Manuscript:  LETTER
Category: 
Keyword: 
decoupling techniqueintra-EMCdigital wireless equipmentinterference noisesensitivity reduction
 Summary | Full Text(in Japanese):PDF(688.1KB)

An Analysis of the Body Proximity Cross-Polarization Power Ratio in a Human Walking Motion
Kun LI Kazuhiro HONDA Koichi OGAWA 
Publication:   B - Abstracts of IEICE TRANSACTIONS on Communications (Japanese Edition)
Publication Date: 2016/07/01
Vol. J99-B  No. 7  pp. 544-547
Type of Manuscript:  Special Section LETTER (Special Issue for Encouraging Young Researchers)
Category: 
Keyword: 
body proximity cross-polarization power ratioOn-Body channeldynamic human modelwalking motion
 Summary | Full Text(in Japanese):PDF(1.4MB)

Multi-Band Decoupling Method Using Two-Branch Antennas
Hiroshi SATO Yoshio KOYANAGI Koichi OGAWA Masaharu TAKAHASHI 
Publication:   B - Abstracts of IEICE TRANSACTIONS on Communications (Japanese Edition)
Publication Date: 2013/09/01
Vol. J96-B  No. 9  pp. 1048-1056
Type of Manuscript:  Special Section PAPER (Special Issue on Antennas and Propagation Technologies Supporting Fusions of Wireless Systems)
Category: 
Keyword: 
MIMOantennadecoupling circuitantenna efficiencycorrelation coefficient
 Summary | Full Text(in Japanese):PDF(1.9MB)

An Electric and Magnetic Current-Excited Loop Antenna used for Information Home Appliances
Yoshishige YOSHIKAWA Koichi OGAWA 
Publication:   B - Abstracts of IEICE TRANSACTIONS on Communications (Japanese Edition)
Publication Date: 2013/09/01
Vol. J96-B  No. 9  pp. 1086-1089
Type of Manuscript:  Special Section LETTER (Special Issue on Antennas and Propagation Technologies Supporting Fusions of Wireless Systems)
Category: 
Keyword: 
an electric and magnetic current-excited loop antennainformation appliancesspecified low power radiohome network
 Summary | Full Text(in Japanese):PDF(806.9KB)

A High-Sensitivity MRC Diversity Antenna for Tablet Handsets Considering the Mutual Interactions between the Holding Angle and Broadcasting Waves Polarization
Makoto YAMAZAKI Kazuhiro HONDA Koichi OGAWA 
Publication:   B - Abstracts of IEICE TRANSACTIONS on Communications (Japanese Edition)
Publication Date: 2013/09/01
Vol. J96-B  No. 9  pp. 991-1000
Type of Manuscript:  Special Section PAPER (Special Issue on Antennas and Propagation Technologies Supporting Fusions of Wireless Systems)
Category: 
Keyword: 
maximum ratio combining diversity antennaholding stylepolarizationcurrent on a ground planeslit
 Summary | Full Text(in Japanese):PDF(1.6MB)

Digital Video-Oculography Robust over Several Obstacles for Non-invasive Autonomic Nerve Quantification
Masaru KIYAMA Hitoshi IYATOMI Koichi OGAWA 
Publication:   D - Abstracts of IEICE TRANSACTIONS on Information and Systems (Japanese Edition)
Publication Date: 2013/04/01
Vol. J96-D  No. 4  pp. 867-875
Type of Manuscript:  Special Section PAPER (Special Section on Medical Imaging)
Category: 
Keyword: 
pupilautonomic nervevideo-oculographyimage segmentation
 Summary | Full Text(in Japanese):PDF(2.1MB)

A Method of Estimating the Intra-EMC Problem Using the Weighted Magnetic Field Correlation Considering Noise Source Polarization
Tomoya MAEKAWA Koichi OGAWA 
Publication:   B - Abstracts of IEICE TRANSACTIONS on Communications (Japanese Edition)
Publication Date: 2013/04/01
Vol. J96-B  No. 4  pp. 398-409
Type of Manuscript:  Special Section PAPER (Special Issue on Technology for Design and Assessment of EMC Countermeasure in Diversified Electromagnetic Environments)
Category: 
Keyword: 
Intra-EMC problemcorrelation coefficientmagnetic field distributionnoise source polarizationmobile equipment
 Summary | Full Text(in Japanese):PDF(2.2MB)

A Design Method for a Small Loop Antenna with Wide Band Decoupling Characteristics using an Equivalent Circuit including the Effects of a Human Hand
Norihiro MIYASHITA Koichi OGAWA Tadahiko MAEDA 
Publication:   B - Abstracts of IEICE TRANSACTIONS on Communications (Japanese Edition)
Publication Date: 2012/09/01
Vol. J95-B  No. 9  pp. 1078-1089
Type of Manuscript:  Special Section PAPER (Special Section on Antennas and Propagation Technologies for Progress in Wireless Systems)
Category: 
Keyword: 
loop antennamutual couplinghuman handequivalent circuit
 Summary | Full Text(in Japanese):PDF(2.5MB)

Approximate Belief Propagation by Hierarchical Averaging of Outgoing Messages
Koichi OGAWARA 
Publication:   D - Abstracts of IEICE TRANSACTIONS on Information and Systems (Japanese Edition)
Publication Date: 2011/03/01
Vol. J94-D  No. 3  pp. 593-603
Type of Manuscript:  PAPER
Category: 
Keyword: 
belief propagationstereoGPU
 Summary | Full Text(in Japanese):PDF(886.8KB)

A Small Loop Antenna with a Function of Controlling Electric and Magnetic Current Modes
Norihiro MIYASHITA Koichi OGAWA Tadahiko MAEDA 
Publication:   B - Abstracts of IEICE TRANSACTIONS on Communications (Japanese Edition)
Publication Date: 2010/09/01
Vol. J93-B  No. 9  pp. 1159-1169
Type of Manuscript:  Special Section PAPER (Special Issue on Antennas and Propagation Supporting Advanced Wireless System)
Category: 
Keyword: 
loop antennamutual couplingdifferential phase feedhuman body effect
 Summary | Full Text(in Japanese):PDF(2.3MB)

Assessment, Analysis and High-Performance Technologies for Handset Antenna Systems
Koichi OGAWA 
Publication:   B - Abstracts of IEICE TRANSACTIONS on Communications (Japanese Edition)
Publication Date: 2010/09/01
Vol. J93-B  No. 9  pp. 1100-1114
Type of Manuscript:  Special Section PAPER (Special Issue on Antennas and Propagation Supporting Advanced Wireless System)
Category: 
Keyword: 
handset antennafigure-of-meritOTAelectromagnetic human phantomMIMO
 Summary | Full Text(in Japanese):PDF(2.2MB)

Recognition of Sequential Patterns by Combining Mutually Constrained Local Classifiers
Masahiro FUKUTOMI Koichi OGAWARA Yaokai FENG Seiichi UCHIDA 
Publication:   D - Abstracts of IEICE TRANSACTIONS on Information and Systems (Japanese Edition)
Publication Date: 2010/04/01
Vol. J93-D  No. 4  pp. 548-551
Type of Manuscript:  LETTER
Category: 
Keyword: 
sequential pattern recognitionmajority votingonline character recognitiongraph cuts
 Summary | Full Text(in Japanese):PDF(204.5KB)

Accurate Rotation of Binary Images
Hitoshi IYATOMI Koichi OGAWA 
Publication:   D - Abstracts of IEICE TRANSACTIONS on Information and Systems (Japanese Edition)
Publication Date: 2009/09/01
Vol. J92-D  No. 9  pp. 1682-1685
Type of Manuscript:  LETTER
Category: 
Keyword: 
image rotationbinary imagebi-linear interpolationforward mapping
 Summary | Full Text(in Japanese):PDF(155.3KB)

A Basic Investigation on the SAR Characteristics of Planar Slot Antennas Close to a Human Body
Shoichi KAJIWARA Koichi OGAWA Koichi ITO 
Publication:   B - Abstracts of IEICE TRANSACTIONS on Communications (Japanese Edition)
Publication Date: 2009/09/01
Vol. J92-B  No. 9  pp. 1464-1468
Type of Manuscript:  Special Section PAPER (Special Issue on Simulation and Analysis Methods for Antennas and Propagation Technologies)
Category: 
Keyword: 
slot antennadipole antennaSARBANphantom
 Summary | Full Text(in Japanese):PDF(775.1KB)

An Analysis of Frequency Characteristics of a Parallel Dipole MIMO Antenna Considering the Effects of Impedance Matching Circuit
Koichi OGAWA Toshiteru HAYASHI Atsushi YAMAMOTO 
Publication:   B - Abstracts of IEICE TRANSACTIONS on Communications (Japanese Edition)
Publication Date: 2009/09/01
Vol. J92-B  No. 9  pp. 1416-1430
Type of Manuscript:  Special Section PAPER (Special Issue on Simulation and Analysis Methods for Antennas and Propagation Technologies)
Category: 
Keyword: 
handset MIMO antennamatching circuitload impedancesimultaneous conjugate matching conditionfrequency characteristics
 Summary | Full Text(in Japanese):PDF(1.4MB)

An Analysis of the Channel Capacity of Handset MIMO Antennas under Received Power Imbalance Condition
Koichi OGAWA Satoru AMARI Atsushi YAMAMOTO 
Publication:   B - Abstracts of IEICE TRANSACTIONS on Communications (Japanese Edition)
Publication Date: 2008/09/01
Vol. J91-B  No. 9  pp. 948-959
Type of Manuscript:  Special Section PAPER (Special Issue on Emerging Technologies of Antennas and Propagation Supporting High-speed Wireless Communications)
Category: 
Keyword: 
handset MIMOpower imbalancechannel capacityhuman body effectMIMO channel modeling
 Summary | Full Text(in Japanese):PDF(1.7MB)

Ultra-High Resolution X-Ray CT System with CdTe Semiconductor Detectors
Junpei YOSHITAKE Koichi OGAWA 
Publication:   D - Abstracts of IEICE TRANSACTIONS on Information and Systems (Japanese Edition)
Publication Date: 2008/07/01
Vol. J91-D  No. 7  pp. 1757-1765
Type of Manuscript:  Special Section PAPER (Special Section on Medical Imaging)
Category: 
Keyword: 
X-ray CTsemiconductor detectorCdTehigh spatial resolution
 Summary | Full Text(in Japanese):PDF(1.1MB)

A Method of SAR Prediction by H-Field Measurements Suitable for Mass Production Quality Control Purposes and the Development of the Measurement System
Shoichi KAJIWARA Akihiro OZAKI Koichi OGAWA Yoshio KOYANAGI 
Publication:   B - Abstracts of IEICE TRANSACTIONS on Communications (Japanese Edition)
Publication Date: 2007/11/01
Vol. J90-B  No. 11  pp. 1193-1205
Type of Manuscript:  Special Section PAPER (Special Section on Broadband EMC Technologies)
Category: 
Keyword: 
SAR (Specific Absorption Rate)2D-magnetic field3D-SAR distributionMagnetic probe arrayMass production
 Summary | Full Text(in Japanese):PDF(2.5MB)

A Development of a Realistic Human Phantom in a PDA Position for EM Evaluation of Handset Antennas
Hiroshi IWAI Koichi OGAWA Nobuko HATAKENAKA 
Publication:   B - Abstracts of IEICE TRANSACTIONS on Communications (Japanese Edition)
Publication Date: 2006/05/01
Vol. J89-B  No. 5  pp. 784-793
Type of Manuscript:  PAPER
Category: 
Keyword: 
PDA positionhuman phantomEM evaluationmobile terminal
 Summary | Full Text(in Japanese):PDF(2.4MB)