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Search Results: Conference Papers
 Conference Papers (Available on Advance Programs)  (Sort by: Date Descending)
 17件中 1~17件目  /   
Committee Date Time Place Paper Title / Authors Abstract Paper #
CQ 2019-08-27
11:35
Hokkaido Hakodate arena Video Bitrate Stabilization Method for Viewing Quality Improvement in ABR Streaming
Hiroyuki Kitada, Takafumi Okuyama, Seisho Yasukawa, Yoshikatsu Okazaki (NTT)
HTTP streaming technology is widely used in video streaming.
In HLS and MPEG-DASH which are representative protocols of... [more]
CQ2019-63
pp.33-37
IA 2019-01-25
16:50
Tokyo Tokyo Metropolitan Univ. Akihabara Satellite Campus A Wireless Ad Hoc Networks Localization Method Robust for Addition of Nodes using Improved Vivaldi
Takafumi Okuyama, Takafumi Hayashi (Niigata Univ.)
Currently, various services using the location information of the terminal (node) are deployed.
Although GPS is mainly ... [more]
IA2018-59
pp.31-37
CQ 2017-07-28
16:15
Hyogo Kobe University A Video Bitrate Selection Method to Reduce the Traffic Volume While Maintaining QoE
Takuto Kimura, Arifumi Matsumoto, Takafumi Okuyama, Jun Okamoto (NTT)
It is reported that users who use the video streaming service emphasize less traffic volume than quality. However, since... [more] CQ2017-49
pp.111-116
CQ
(2nd)
2017-01-21
12:30
Osaka Osaka University Nakanoshima Center [Poster Presentation] A network-assisted video pacing method improved by partial video data reception
Takuto Kimura, Takafumi Okuyama, Arifumi Matsumoto, Takanori Hayashi (NTT)
We have proposed a network-assisted video pacing control method that receives video data at a timing with relatively hig... [more]
CQ 2017-01-20
13:15
Osaka Osaka University Nakanoshima Center A study for improving a goodput estimation method in video streaming services
Takafumi Okuyama, Takuto Kimura, Arifumi Matsumoto (NTT)
In the video distribution service using HTTP based Adaptive bitrate streaming technology, we have studied a method that ... [more] CQ2016-103
pp.75-80
SDM, EID 2014-12-12
16:45
Kyoto Kyoto University Temperature Dependence of Current Gain in 4H-SiC BJTs
Satoshi Asada, Takafumi Okuda, Tsunenobu Kimoto, Jun Suda (Kyoto Univ.)
Temperature dependence of current gain from 140 to 460 K in a 4H-SiC bipolar junction transistor (SiC BJT) was investiga... [more] EID2014-35 SDM2014-130
pp.115-118
EE, IEE-SPC 2012-07-31
09:00
Nara   An Experimental Study on Pulse Shape and Cable Characteristics for Power Packet Transmission
Takuya Kajiyama, Takafumi Okuda, Ryo Takahashi, Takashi Hikihara (Kyoto Univ.)
Power packet transmission system is a new power distribution system. This system is based on a concept of packet communi... [more] EE2012-9
pp.45-49
IN 2012-04-12
16:20
Kyoto Kyotofu-Chusho-Kigyo-Kaikan [Invited Talk] Technical Trends for NAT and NAT Traversal
Tomohiro Nishitani, Takafumi Okuyama, Toshiyuki Iwata (NTT Com)
According to IPv4 exhaustion, ISP and mobile operator have introduced Network Address Translation(NAT) to suppress consu... [more] IN2012-5
pp.21-24
LQE, ED, CPM 2011-11-17
14:50
Kyoto Katsura Hall,Kyoto Univ. Current Transport Characteristics of Quasi-AlGaN/SiC Heterojunction Bipolar Transistors with Various Band Discontinuities
Takafumi Okuda, Hiroki Miyake, Tsunenobu Kimoto, Jun Suda (Kyoto Univ.)
 [more] ED2011-81 CPM2011-130 LQE2011-104
pp.39-42
IN, NS
(Joint)
2009-03-03
11:10
Okinawa Okinawa-Zanpamisaki Royal Hotel A Proporsal of Threshold Calculation for Monitoring the Quantile of Packet Transfer Delay
Takafumi Okuyama, Katsunori Ori (NTT)
In management of quality-awared IP networks, it is necessary to monitor the networks in order to recover accidents or qu... [more] IN2008-161
pp.173-178
MI 2009-01-20
10:40
Overseas National Taiwan University Improved Detection of Tumors in FDG-PET/CT Images Based-on Single-Class Classifier
Yoshihide Sawada, Takafumi Oku, Hidekata Hontani (Nagoya Inst. of Tech.), Jin Wu (Chiba Univ.), Tohoru Takeda (Tsukuba Univ.), Yorihisa Watanabe (Yamagata Saisei Hospital)
In this paper, we reported on a single-class classifier that separates true malignant tumors and false ones. We are deve... [more] MI2008-109
pp.229-234
ICM, CQ, NS
(Joint)
2008-11-13
18:25
Fukushima Nihon University Spectrum Analysis of Packet Transmission Delay and Its Application to Network Management
Katsunori Ori, Takafumi Okuyama (NTT)
 [more] CQ2008-52
pp.39-44
IN, MoNA
(Joint)
2006-11-16
16:50
Kumamoto   Investigation of the trade-off between the reduced delay jitter and the increased traffic load due to the multipath forwarding
Takafumi Okuyama, Kenta Yasukawa, Katsunori Yamaoka (Tokyo Tech)
Delay jitter degrades the quality of delay-sensitive streaming services. We investigated the use of multipath-based dela... [more] MoMuC2006-57
pp.23-27
MVE, CQ, MoNA
(Joint)
2006-01-27
14:50
Oita Beppu Onsen Spring (Resorpia Beppu Hotel) Performance evaluation of path-set configuration scheme for delay jitter reduction by utilizing multipath
Takafumi Okuyama, Kenta Yasukawa, Katsunori Yamaoka (titech)
Delay jitter causes QoS degradation in delay sensitive real-time multimedia communications. We focused on delay jitter r... [more] MoMuC2005-83
pp.55-60
NS 2005-06-23
16:25
Fukuoka Production and Systems, Waseda Univ.(Kitakyusyu) A Secure Campus Public Network using User and MAC Address Binding Authentication to Reduce Operational Costs
Takafumi Okuyama, Noriyuki Takahashi, Kenta Yasukawa, Yukio Shigenari, Takamichi Miyata, Katsuyoshi Iida (TokyoTech)
Many high educational institutes including universities are now deploying campus public LAN to enable accessing educatio... [more] NS2005-45
pp.29-32
NS, IN 2005-03-03
10:10
Okinawa Okinawa Zanpa-misaki Royal Proposal and Evaluation of Multiple Path Routing for Reducing Delay Jitter
Takafumi Okuyama, Kenta Yasukawa, Katsunori Yamaoka (TokyoTech)
Delay jitter and packet loss cause QoS degradation in real-time multimedia communication applications.
Previous studies... [more]
NS2004-220 IN2004-220
pp.119-124
EMCJ 2005-01-21
09:30
Okinawa NiCT Okinawa Subtropical Environment Remote Sensing Center A Fundamental Study on the Wireless LAN Type Wave Absorber Combined Resistive Sheet with Wood
Takafumi Okuma, Osamu Hashimoto (Aoyama Gakuin Univ.)
 [more] EMCJ2004-132
pp.7-12
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