論文 - 伊藤 嘉浩
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Evaluation of Effect of IP Performance Degradation on QoE-Web of Online Shopping Service 査読あり
Yosuke Nomura, Yoshihiro Ito
Proceedings of IEICE 2013 International Workshop on Smart Info-Media Systems in Asia 172 - 176 2013年09月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
paper studies effect of IP performance degradation on quality of experience (QoE) of an online shopping Web service by experiment; it considers the usability based on the ISO 9241-11 as QoE of a Web service (QoE-Web) and the IP performance metrics standardized by the IETF. Moreover, the paper tackles clarification of the relationship between ISO-based QoE-Web and IETF-based IP performance by the multiple regression analysis. The experiment is intended for the two actual Japanese online shopping services and utilizes 35 subjects. From the results, the paper quantitatively discusses how the QoE-Web deteriorates owing to the IP performance degradation and shows that it is appropriate to evaluate the deterioration with ISO-based Web usability.
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Evaluation of Influence of IP QoS Degradation on Web–QoE by Severity Rating Method 査読あり
Yoshihiro Ito, Yosuke Nomura
Proceedings of IEEE The 9th Asia-Pacific Conference on Communicaitons 404 - 408 2013年08月
担当区分：筆頭著者 記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
This paper studies evaluation of influence of IP
performance degradation on QoE of a Web service by means of the severity rating method. The authors consider Web usability as the QoE and tackle to evaluate it by using Nielsen’s severity rating. The severity on the Web usability is one of measures
that represent how a problem degrades the usability of a Web service. This paper defines the concrete scales about the severity and evaluates them for the two existing online shopping services by experiments, which consist of the two stages. One is done to clarify problems caused by the IP performance degradation, and the other is for assessment of Web usability with the severity rating. From the results, this study clarifies the four problems and measures the severity for each problem; it then shows how the problems aggravate the Web usability of the services. Consequently, the authors confirm that the severity
rating method is effective in evaluation of the influence of the IP quality deterioration on QoE of a Web service. -
A study on Effect of IP performance degradation on Horizontal Sound Localization in a VoIP Phone Service with 3D Sound Effects 査読あり
Yoshihiro Ito, Toru Tahara, Susumu Kuroyanagi
Proc. 2012 IIAI International Conference on Advanced Applied Informatics 357 - 361 2012年09月
担当区分：筆頭著者 記述言語：英語 掲載種別：研究論文（学術雑誌）
This paper studies a VoIP phone service with 3D sound effects (3D effect phone), which gives users more feeling of being at a live communication than legacy phone services. However, since an IP network is a best-effort one, we must consider effect of IP performance degradation on the 3D effect phone service. This paper evaluates effect of a speech coding IP packet loss on horizontal sound localization by experiment. The experimental results show the following three issues. First, a 3D effect phone service is feasible. Second, ITU-T G. 711 encoding is more suitable to the service than Speex encoding. Third, IP packet losses deteriorate horizontal sound localization.
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Study on Effect of IP Performance Degradation on Web Usability with the Severity Rating 査読あり
Yoshihiro Ito, Hiroyuki Haga
Proc. APCHI'12 2 767 - 768 2012年08月
担当区分：筆頭著者 記述言語：英語 掲載種別：研究論文（学術雑誌）
This paper studies the effect of IP performance degradation on Web usability by using Nielsen’s severity rating. The severity on the Web usability is one of measures that represent how a problem degrades the usability of a Web service; it is obtained from three attributes: the frequency, the impact and the persistence. This paper defines the concrete scales about the severity and evaluates them for the two existing online shopping services by experiments, which consist of the two stages. One is done to clarify problems caused by the IP performance degradation, and the other is for assessment of Web usability with the severity rating. From the results, this study clarifies the four problems and measures the severity for each problem; it then shows how the problems aggravate the Web usability of the services.
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Evaluation of User-Satisfaction in Online Shopping Web Services with TCP Variables 査読あり
Yoshihiro Ito, Tohru Tahara
Proc. IEEE/IPSJ SAINT 2011 Workshop C3NET 2011 469 - 473 2011年07月
担当区分：筆頭著者 記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
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Calculation of necessary QoS for user satisfaction with a QoS mapping matrix 査読あり
Yoshihiro Ito
Proceedings of the 2010 10th IEEE/IPSJ International Symposium on Application and the Internet 1 ( 1 ) 233 - 236 2010年07月
担当区分：筆頭著者 記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
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Feasibility of QoS control based n QoS mapping over IP networks "jointly worked" 査読あり
Y. Ito, S. Tasaka
Elsevier Computer Commnications 31 ( 10 ) 2589 - 2595 2008年06月
担当区分：筆頭著者 記述言語：英語 掲載種別：研究論文（学術雑誌）
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User-level QoS assessment of a multipoint-to-multipoint TV conferencing application over IP networks "jointly worked" 査読あり
Y. Ito, S. Tasaka
Proceedings of the 5th IEEE/IFIP Workshop on End-to-End Monitoring Techniques and Sevices (E2EMON2007) 1 - 8 2007年05月
担当区分：筆頭著者 記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
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Y. Ito S. Tasaka
IEICE Transactions on Communications E90-B ( 5 ) 1112 - 1121 2007年05月
担当区分：筆頭著者 記述言語：英語 掲載種別：研究論文（学術雑誌）
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User-level QoS assessment of a multipoint-to-multipoint TV conferencing applications over IP networks "jointly worked" 査読あり
Y. Ito, S. Tasaka
COnference Record of IEEE Global Telecommunications Conference (GLOBECOM2006) QRP08-2 2006年11月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
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A method of user-level QoS guarantee by session controll in audio-video tranmission ove IP networks "jointly worked" 査読あり
S. Tasaka, Y. Ito, Y. Yamada, J. Sako
Conference Record of IEEE Global Telecommunications Conference (GLOBECOM2006) GRP08-2 2006年11月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
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Enhancement of user-level QoS in audio-video IP transmission by utilizing the mutually compensatory property "jointly worked" 査読あり
S. Tasaka, J. Sako, Y. Ito
Conference Record of IEEE Global Telecommunicaitons Conference (GLOBECOM2006) MMC02-1 2006年11月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
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Feasibility of QoS control based on QoS mapping in audio-video transmission over IEEE 802.11 wireless LAN "jointly worked" 査読あり
Y. Ito, S. Tasaka
Conference Record of IEEE International Conference on Communications (ICC2006) 2 5097 - 5102 2006年06月
担当区分：筆頭著者 記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
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Real-time estimation of user-level QoS of audio-video transmission over IP networksn "jointly worked" 査読あり
S. Tasaka, Y. Ito
Comference Record of IEEE International Conference on Communications (ICC2006) 2 884 - 890 2006年06月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
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Continuous time assessment and mapping of user-level QoS in audio-video transmission over IP networks "jointly worked" 査読あり
Y. Ito, S. Tasaka, R. Ito
Proceedings of IASTED Communications and Computer Networks (CCN2005) 230 - 237 2005年10月
担当区分：筆頭著者 記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
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Effect of monitor size on user-level QoS of audio-video transmission over IP networks in ubiquitous environment "jointly worked" 査読あり
Y. Ito, S. Tasaka
Proceedings of IEEE International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC2005) 2005年09月
担当区分：筆頭著者 記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
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Quantitative assessment of user-level QoS and its mapping "jointly worked" 査読あり
Y.Ito, S. Tasaka
IEEE Trans. Multimedia 7 ( 3 ) 572 - 584 2005年06月
担当区分：筆頭著者 記述言語：英語 掲載種別：研究論文（学術雑誌）
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IPネットワーク上での音声・ビデオ伝送におけるユーザレベルQoSの多次元評価 (共著） 査読あり
伊藤嘉浩, 田坂修二
電子情報通信学会論文誌 J88-B ( 3 ) 689 - 702 2005年03月
担当区分：筆頭著者 記述言語：日本語 掲載種別：研究論文（学術雑誌）
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Psychometric analysis of the effect of the buffering delay on user-level QoS in an interactive audio-visual application "jointly worked" 査読あり
Y. Ito, S. Tasaka, Y. Fukuta
Proc. ACM Workshop on Next-Generation Residential Broadband Challenges 2 - 10 2004年10月
担当区分：筆頭著者 記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
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Psychometric analysis of the effect of end-to-end delay on user-level QoS in live audio-video transmission "jointly worked"
Y. Ito, S. Tasaka, Y. Fukuta
Conf. Rec. IEEE ICC2004 2214 - 2220 2004年06月
担当区分：筆頭著者 記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
