Committee 
Date Time 
Place 
Paper Title / Authors 
Abstract 
Paper # 
EE 
20180130 09:30 
Oita 
Satellite Campus Oita 
HalfBridge DCDC Converter Formulation Under Asymmetrical Control Daiki Yaginuma, Kyohei Yamada, Hikaru Kitaoka, Takashi Ohira (Toyohashi Univ. of Tech.) EE201765 
In this paper, an asymmetrical control scheme is considered to regulate the output voltage of a halfbridge DCDC conver... [more] 
EE201765 pp.133138 
MW 
20171220 13:20 
Tokyo 

Maximization of power transmission efficiency of coupler considering element loss in impedance matching circuit Ryoichi Baba, Kyohei Yamada, Naoki Sakai, Takashi Ohira (TUT) MW2017159 
In wireless power transmission systems, transmission efficiency is one of important parameters. Therefore, improvement o... [more] 
MW2017159 pp.101105 
MW 
20171220 14:10 
Tokyo 

Design Theory of LCLadder Matching with Minimum Stored Energy Kyohei Yamada, Takashi Ohira (TUT) MW2017161 
A design theory of an LC ladder which transforms a positive real impedance to another with minimum stored energy is prop... [more] 
MW2017161 pp.113116 
MW 
20171110 10:40 
Okinawa 
Miyakojima Marin Terminal Bldg. 
Topology maps for power dissipation minimization in LC matching circuits Naoki Sakai, Kyohei Yamada, Takashi Ohira (Toyohashi Univ. of Tech.) MW2017131 
Power dissipation in LC matching circuits is one problem for wireless highpower transfer system.
This paper presents ... [more] 
MW2017131 pp.105110 
EE, WPT, IEESPC [detail] 
20170727 09:30 
Tokyo 
KikaiShinkoKaikan Bldg. 
[Invited Lecture]
6.78MHz Current Doubler Rectifier with HighQ Inductor Kyohei Yamada (TUT) EE201710 WPT201715 
This technical report talks about prototyping of a 6.78MHz current doubler rectifier in which an inductor with high unl... [more] 
EE201710 WPT201715 pp.14 
EE, WPT, IEESPC [detail] 
20170728 10:55 
Tokyo 
KikaiShinkoKaikan Bldg. 
[Invited Lecture]
2.4GHz HighImpedance Rectifier Kyohei Yamada (TUT) EE201725 WPT201730 
I report design and fabrication process of a 2.4GHz highimpedance rectifier which competed in Radio Frequency Rectifie... [more] 
EE201725 WPT201730 pp.8992 
HPB (2nd) 
20170222 11:25 
Tokyo 

Activity Estimation for People Working in Office using Power and Vibration Sensors Kyohei Yamada, Ryota Tsubakitani (NITT), Ryushi Kimura (NITK), Hideyuki Kobayashi (NITS), Shinichiro Mito (NITT) 
In this study, we attempted to estimate people's position and behavior using wireless power sensors and vibration sensor... [more] 

MW 
20161216 14:30 
Kanagawa 
National Defense Academy 
How to Find N of Nway Resistance Compression Network That Makes InputResistance Variation within Specified Value Kyohei Yamada, Shinji Abe, Takashi Ohira (Toyohashi Univ. Tech.) MW2016165 
[more] 
MW2016165 pp.189194 
MW 
20161216 16:00 
Kanagawa 
National Defense Academy 
Two Topologies of QuarterWaveLine Inserted Resistance Compression Rectifier
 ShuntShunt Topology and SeriesSeries Topology  Shinji Abe, Kyohei Yamada, Naoki Sakai, Takashi Ohira (TUT) MW2016169 
In order to supply power active DC load such as motor and battery with wireless power transfer, we proposed quarterwave... [more] 
MW2016169 pp.211214 
EE, WPT (Joint) 
20161007 09:50 
Kyoto 

Analysis of a VoltageDoublerBased Resistance Compression Rectifier
 Proposal of a novel analysis method by squarewave approximation  Kyohei Yamada, Yoichiro Miyazaki, Shinji Abe, Naoki Sakai, Takashi Ohira (Toyohashi Univ. Tech.) WPT201632 
[more] 
WPT201632 pp.7378 
MW 
20160623 13:00 
Gifu 
Gifu Univ. 
Vector Fields Depicted by Linear TwoPort Circuits on the Smith Chart Kyohei Yamada, Shinji Abe, Naoki Sakai, Takashi Ohira (Toyohashi Univ. Tech.) MW201630 
From the viewpoint of impedance transformation, the characteristic of a linear twoport network is determined by the imp... [more] 
MW201630 pp.15 
MBE, NC (Joint) 
20160323 14:45 
Tokyo 
Tamagawa University 
Verification of color receptive field of mammals and insects with ICA Ryohei Yamada (Tokyo Tech), Yoichi Seki, Hiroyoshi Miyakawa, Takako Morimoto (Tokyo University of Pharmacy and Life Sciences), Toru Aonishi (Tokyo Tech) NC201586 
It is important to understand how efficiently information from the natural world is processed in the brain. It is sugges... [more] 
NC201586 pp.95100 
WPT (2nd) 
20151210 11:00 
Overseas 
TamKang University, Tamsui Campus 
SakiharaMoebius Harmonometer to Measure Simultaneous Voltage and Current on Nonlinear Devices and Circuits Masaru Tanaka, Kyohei Yamada, Naoki Sakai, Takashi Ohira (TUT) 
[more] 

WPT (2nd) 
20151210 11:20 
Overseas 
TamKang University, Tamsui Campus 
Impedance Matching Circuit Optimization for a Miniature EVER System from Hyperbolic Geometry Kyohei Yamada, Naoki Sakai, Takashi Ohira (Toyohashi Univ. Tech.) 
[more] 

MW, AP (Joint) 
20150917 10:55 
Tochigi 
Oyama National College of Tech. 
New Expression of Loss in LC Circuts Kyohei Yamada, Naoki Sakai, Takashi Ohira (TUT) MW201588 
Two kinds of geometric expressions of losses in a matching circuit are presented using a concept of length or distance. ... [more] 
MW201588 pp.912 
EE, WPT, IEESPC (Joint) [detail] 
20150706 14:00 
Kyoto 

HyperbolicGeometrywise Expression of Power Loss for Impedance Matching Circuits with Shunt/Series Elements by Poincare Metric Kyohei Yamada, Naoki Sakai, Takashi Ohira (TUT) WPT201536 
[more] 
WPT201536 pp.16 
WPT, MW 
20150417 14:25 
Tokyo 
KikaiShinkoKaikan Bldg. 
Power Efficiency Formula for Unit LC Circuit to Match ComplexImpedance Ports
 Expression Featuring Manhattan Distance and Voronoi Diagram  Kyohei Yamada, Naoki Sakai, Takashi Ohira (TUT) WPT201516 MW201516 
The efficiency of an Lshaped matching circuit consisting of two reactive elements is formulated. The efficiency formula... [more] 
WPT201516 MW201516 pp.8185 
EE, WPT (Joint) 
20141119 11:25 
Kyoto 
Doshisha University 
Proposal of HighVoltage OctupleCurrent DCtoDC Converter
 ZVSCondition Derivation and 1kV Prototype Design  Daiya Egashira, Kyohei Yamada, Naoki Sakai, Takashi Ohira (Toyohashi Tech.) EE201424 
In this paper, we propose highvoltage octuplecurrent DCtoDC converter. The proposed DCtoDC converter performs ZVS ... [more] 
EE201424 pp.3136 
EE, IEESPC 
20140710 15:30 
Hiroshima 
Hiroshima Institute of Technology 
A Linear Impedance Transformer without Mutual Inductance and Its Minimum Configuration Kyohei Yamada, Takashi Ohira (Toyohashi Univ. Tech.) EE20147 
Magnetic transformers play important roles in electric power conversion equipment. Magnetic trans formers are mainly em... [more] 
EE20147 pp.1116 
MW 
20140626 09:30 
Aichi 
Toyohashi Univ. of Tech. 
Extended kQ product for twoport LCR networks Naoki Sakai, Kyohei Yamada, Takashi Ohira (Toyohashi Univ. of Tech.) MW201443 
This paper calculates extended $kQ$ product of various 2port network topologies consisting of lumpedconstant resistors... [more] 
MW201443 pp.711 