Hiroyuki YOKOYAMA


Shaka: User Movement Estimation Considering Reliability, Power Saving, and Latency Using Mobile Phone
Arei KOBAYASHI Shigeki MURAMATSU Daisuke KAMISAKA Takafumi WATANABE Atsunori MINAMIKAWA Takeshi IWAMOTO Hiroyuki YOKOYAMA 
Publication:   IEICE TRANSACTIONS on Information and Systems
Publication Date: 2011/06/01
Vol. E94-D  No. 6  pp. 1153-1163
Type of Manuscript:  Special Section PAPER (Special Section on Emerging Technologies of Ubiquitous Computing Systems)
Category: 
Keyword: 
activity recognitionaccelerometermicrophoneGPSreliabilitypower savinglatency
 Summary | Full Text:PDF

Design and Implementation of Pedestrian Dead Reckoning System on a Mobile Phone
Daisuke KAMISAKA Shigeki MURAMATSU Takeshi IWAMOTO Hiroyuki YOKOYAMA 
Publication:   IEICE TRANSACTIONS on Information and Systems
Publication Date: 2011/06/01
Vol. E94-D  No. 6  pp. 1137-1146
Type of Manuscript:  Special Section PAPER (Special Section on Emerging Technologies of Ubiquitous Computing Systems)
Category: 
Keyword: 
pedestrian dead reckoningpedestrian navigation systemindoor positioningmotion sensormobile phonegait analysis
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A Secure Content Delivery System Based on a Partially Reconfigurable FPGA
Yohei HORI Hiroyuki YOKOYAMA Hirofumi SAKANE Kenji TODA 
Publication:   IEICE TRANSACTIONS on Information and Systems
Publication Date: 2008/05/01
Vol. E91-D  No. 5  pp. 1398-1407
Type of Manuscript:  Special Section PAPER (Special Section on Information and Communication System Security)
Category: Contents Protection
Keyword: 
field-programmable gate array (FPGA)partial run-time reconfiguration (RTR)content protectiondigital rights management (DRM)
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Design Methods for Utility Max-Min Fair Share Networks
Hiroyuki YOKOYAMA Hajime NAKAMURA Shinichi NOMOTO 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2004/10/01
Vol. E87-B  No. 10  pp. 2922-2930
Type of Manuscript:  PAPER
Category: Network
Keyword: 
utility functionsmax-min fair sharebandwidth allocationnetwork design
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Optical Sampling System Using Compact and Stable External-Cavity Mode-Locked Laser-Diode Modules
Masayuki SHIRANE Yoichi HASHIMOTO Hirohito YAMADA Hiroyuki YOKOYAMA 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2004/07/01
Vol. E87-C  No. 7  pp. 1173-1180
Type of Manuscript:  Special Section PAPER (Special Section on Ultrafast Photonics)
Category: 
Keyword: 
optical samplingmode-lockingeye patternfour-wave mixingall-optical clock recoveryoptical gate
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Reflection Routing: A Simple Approach for Contention Resolution in All-Optical Packet Switched Networks
Hiroyuki YOKOYAMA Hajime NAKAMURA Shinichi NOMOTO 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2004/06/01
Vol. E87-B  No. 6  pp. 1561-1568
Type of Manuscript:  PAPER
Category: Network
Keyword: 
optical packet switchingroutingreflectiontopologypacket loss ratio
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Prototype System of SLAMNet: Implementation and Performance Analysis of Signaling-Free Wavelength Path Switching Network
Hiroyuki YOKOYAMA Hajime NAKAMURA Shinichi NOMOTO 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2004/04/01
Vol. E87-B  No. 4  pp. 932-939
Type of Manuscript:  PAPER
Category: Network
Keyword: 
optical networksDWDMbest effortwavelength path assignmentautonomous controlimplementation
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Highly Reliable Mode-Locked Semiconductor Lasers
Hiroyuki YOKOYAMA 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2002/01/01
Vol. E85-C  No. 1  pp. 27-36
Type of Manuscript:  INVITED PAPER (Special Issue on Recent Progress in Semiconductor Lasers and Light-Emitting Devices)
Category: 
Keyword: 
semiconductor lasermode-lockingultrashort light pulsesoptical communicationoptical measurement
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Tandem Queue Approximation of Non-preemptive Priority Queues for Capacity Dimensioning and Call Admission Control in an ATM Switch
Hiroyuki YOKOYAMA Hajime NAKAMURA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 1998/11/25
Vol. E81-B  No. 11  pp. 2072-2080
Type of Manuscript:  Special Section PAPER (Special Issue on Performance and Quality of Service (QoS) of Multimedia Networks)
Category: ATM Networks
Keyword: 
ATMpriority controlQoSCACbandwidth controleffective bandwidth
 Summary | Full Text:PDF

Ultrafast All-Optical Signal Processing with Mode-Locked Semiconductor Lasers
Hisakazu KURITA Ichiro OGURA Hiroyuki YOKOYAMA 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 1998/02/25
Vol. E81-C  No. 2  pp. 129-139
Type of Manuscript:  INVITED PAPER (Special Issue on Ultrashort Optical Pulse Technologies and their Applications)
Category: Mode-locked and Gain-switched Laser Diodes and High speed EA Modulators
Keyword: 
ultrashort light pulsessemiconductor lasersmode-lockingclock extractiongate switchnonlinear optical effects
 Summary | Full Text:PDF