論文 - 伊藤 嘉浩
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Evaluation of QoE of Web services on a mobile host over a wireless LAN by simulator/emulator system 査読あり
Masaki Shibata, Yoshihiro Ito, Ryosuke Koshimura
Proceedings of 2014 International Conference on Information and Communication Technology Convergence 77 - 81 2014年10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）
This paper studies a method of assessing QoE of Web services on a mobile host over a wireless LAN. To perform QoE assessment, the authors utilize their integrated simulator/emulator system. This experiment assumes six scenarios where pedestrians assess Web services while moving. The authors treat a shopping service and a Wiki service as target Web services and consider Web usability as QoE. The experimental results do not confirm that degradation of QoE depends on that of QoS. Consequently, it is inevitable to assess actual QoE and the integrated simulator/emulator system is effective in performing such assessment.
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Evaluation of Relationship between QoS and QoE for Web Services Considering the Hierarchical Structure with Principal Component Analysis and Path Analysis 査読あり
Ryosuke Koshimura, Yoshihiro Ito
Proceedings of 2014 20th Asia-Pacific Conference on Communications 100 - 105 2014年10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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Assessment of VoIP phone service with binaural 3D audio for multiple sound sources 査読あり
Minoru Tsubota, Yoshihiro Ito, Ryo Murakami
Proceedings of 2014 IEEE 3rd Global Conference on Consumer Electronics 660 - 661 2014年10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）
This paper assesses the 3D sound IP phone service (3D IP phone) developed by the authors under environment with multiple sound sources by experiment. The assessment consists of evaluation of the sound source localization, subjective evaluation and objective one. The authors utilize two sound sources that are conversations carried on by a man and a woman. From the experimental results, this paper shows that multiple sound sources can promote listener's reproduction of sound images. This means that the proposed system can give the higher feeling of being in more real environment.
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Assessment of sense of presence for 3D IP phone service 査読あり
Ryo Murakami, Yoshihiro Ito
Proceedings of 2014 IEEE 3rd Global Conference on Consumer Electronic 567 - 570 2014年10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）
This paper assesses the sense of presence for the 3D audio VoIP phone service with the binaural recording which is proposed by the authors by experiment. In the experiment, the authors use sounds recorded with actual heads, and evaluate the sense of presence and the sound source localization. The experimental results show the subjects can perceive high sense of presence by using our service. Moreover, they also indicate that the difference of actual heads for recording affect both the sense of presence and sound source localization.
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A study of effect of MPTCP on Web usability 査読あり
Daisuke Yamauchi, Yoshihiro Ito
Proceedings of 2014 IEEE 3rd Global Conference on Consumer Electronic 12 - 15 2014年10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）
This paper studies an effect of utilization of Multi-Path TCP (MPTCP) on QoE for Web services. The authors consider the Web usability as QoE and assess it by experiments with subjects; they compare the results of MPTCP with those of TCP. The experimental results show the followings. Indeed the utilization of MPTCP can provide higher QoS of the target Webservices than that of TCP, but it does not always improve QoE.
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Empirical Study on Clarification of Relationship Between QoS and QoE for Web Services by Path Analysis 査読あり
Ryosuke Koshimura, Yoshihiro Ito
Proceedings of 2014 IEEE 3rd Global Conference on Consumer Electronics 10 - 11 2014年10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）
This paper empirically studies clarification of complex relationships between hierarchical QoS and QoE for Web services with the method using the path analysis. In the experiment, the authors treat three Web services and consider 10 parameters of three-layered QoS and four QoE parameters; they suggest a new model for a path diagram. The obtained path diagrams give high goodness-of-fit, 0.916, 0.915, and 0.902, and can clarify the QoS-QoE relationships.
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Effect of QoS Degradation Caused by 6to4 and IPsec on QoE for Web Services 査読あり
Tomohiko Mizoguchi, Yoshihiro Ito
Proceedings of 2014 IEEE 3rd Global Conference on Consumer Electronics 5 - 9 2014年10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）
This paper assesses influence of QoS degradation caused by 6to4 and IPsec on QoE of Web services by experiment. Since utilization of 6to4 and IPsec requires some overheads, QoS degradation caused by them is inevitable. The degradation can also deteriorate QoE of the Web service, but the affect of the degradation has not been clarified. From the experimental results, the authors confirm QoS degradation but see little QoE deterioration. This implies 6to4 and IPSec are usable from a user's point of view.
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Study of necessary number of simultaneous TCP connections in Web client by Web-QoE assessment 査読あり
Daisuke Yamauchi, Yoshihiro Ito
Proceedings of 2013 International Conference on ICT Convergence 234 - 237 2013年10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）
This paper studies the necessary number of simultaneous TCP connections in a Web client for high Web-QoE. Currently, many Web browsers use multiple TCP connections simultaneously for effective data transmission. However, more simultaneous TCP connections make more establishments/closes of connections and do not always give higher quality of a Web service because users often access to the Web services interactively. Moreover, increase of simultaneous TCP connections causes high load of a Web server. That is, there exist a necessary number of simultaneous TCP connections. The authors assess the necessary number of TCP connections for an online shopping Web service by experiment; here, they utilizes two psychophysical methods: the rating scale method and the method of the limit. From experimental results, they show that the necessary number of simultaneous TCP connections for high TCP throughput is not always the same as that for high Web-QoE.
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Development of Web-QoE evaluation system for wireless LAN with combination of simulator and network emulator 査読あり
Ryosuke Koshimura, Yoshihiro Ito
Proceedings of 2013 IEEE 2nd Global Conference on Consumer Electronics 431 - 432 2013年10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）
This paper shows development of a system for assessment of Web-QoE over wireless LANs. By simulation, we can easily consist various types of experimental networks, such as a wireless network, but cannot perform Web-QoE (Quality of Experience of Web services) assessment. On the other hand, we can utilize a network emulator to assess Web-QoE instead of using actual networks. However, such a network emulator cannot imitate many kinds of networks flexibly. Thus, the authors have developed a new system by combining a simulator with a network emulator. This paper confirms that this system is effective in assessment of Web-QoE by experiment.
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Assessment of sound source localization and subjective quality for VoIP phone service with binaural 3D audio 査読あり
Ryo Murakami, Yoshihiro Ito
Proceedings of 2013 IEEE 2nd Global Conference on Consumer Electronics 142 - 146 2013年10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）
This paper studies the feasibility of a VoIP phone service with binaural 3D audio. For this purpose, the paper evaluates it with the objective and subjective evaluation that are for the legacy IP phone services by experiment. Moreover, it assesses the sound source localization, which is inherent in evaluation of 3D audio, for the service. By experiment, the authors show that ITU-T G.711 is better than Speex for the encoding of the service; consequently, they indicate the service is feasible over the Internet.
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Evaluation of relationship between network performance and Web usability considering the hierarchical structure of the QoS with path analysis 査読あり
Yosuke Nomura, Yoshihiro Ito
Proceedings of 2013 IEEE 2nd Global Conference on Consumer Electronics 518 - 519 2013年10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）
As web services run on the Internet, the deterioration communication quality on the Internet has a great influence on Web usability. The communication quality(QoS) has a hierarchical structure because the Internet architecture is also hierarchical. This paper studies the relationship between multiple communication quality evaluations between layers, including quality of experience. In order to do so, we propose the evaluation method by using path analysis to evaluate the effects on Web usability. The experimental results show that satisfaction, one of the scales for Web usability, has a strong relationship with the number of packet retransmission per unit time in TCP layer and it was influenced by packetloss in IP layer indirectly. As a consequence, we confirmed the effectiveness of the evaluation method by using path analysis.
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Effect of network performance degradation on web usability over 6to4 networks 査読あり
Ryo Koyashiki, Yoshihiro Ito
Proceedings of 2013 IEEE 2nd Global Conference on Consumer Electronics 516 - 517 2013年10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）
6to4 is one of the transitional technologies for coexistence of IPv4 and IPv6 and uses tunneling. Using 6to4, however, communication quality is degraded due to overhead of tunneling. In this paper, we investigate the effect of the degradation of communication quality in 6to4 on Web usability that is user experience quality of the Web service. From experimental results, we found that the effect of Web usability due to degradation of 6to4 depends on Web service.
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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）
