Faculty Profiles - KAWAGUCHI, Nobuo

Presentations -

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Gaussian mixture model and particle filter

Kaji K.

2012 International Conference on Indoor Positioning and Indoor Navigation, IPIN 2012 - Conference Proceedings

Scalable QoS for XCAST Using Differentiated Services Architecture (Preprint) International conference

OdiraElishaAbade, Katsuhiko Kaji, Nobuo Kawaguchi

情報処理学会

Event date： 2012.11

Language：English Presentation type：Oral presentation (general)

Country：Japan

Explicit multiunicast (XCAST) has been proposed as a multicasting scheme with complementary scaling properties which can solve the scalability problems of conventional IP Multicast. XCAST is suitable for videoconferencing, online games and IPTV. This paper deals with QoS provisioning in XCAST networks using Differentiated Services (DiffServ). We show that integration of DiffServ in XCAST is a non-trivial problem due to inherent architectural differences between XCAST and DiffServ. We then propose a scheme called QS-XCAST that uses dynamic DSCPs to adapt to the heterogeneity of receivers in an XCAST network. We also provide an algorithm for harmonizing the receiver-driven and sender-driven QoS approaches between XCAST and DiffServ thereby determining the correct DSCP-PHB for all links in an XCAST network. By simulating using OMNeT++ we evaluate QS-XCAST using four metrics: throughput, average per-hop-delay, link utilization and forwarding fairness to other traffic in the network. Our solution eliminates DSCP confusion and collusion attack problems to which naive XCAST QoS provisioning is vulnerable. It also offers a more efficient bandwidth utilization, better forwarding fairness and less traffic load compared to the existing XCAST.------------------------------This is a preprint of an article intended for publication Journal ofInformation Processing(JIP). This preprint should not be cited. Thisarticle should be cited as: Journal of Information Processing Vol.21(2013) No.1 (online)DOI http://dx.doi.org/10.2197/ipsjjip.21.131------------------------------Explicit multiunicast (XCAST) has been proposed as a multicasting scheme with complementary scaling properties which can solve the scalability problems of conventional IP Multicast. XCAST is suitable for videoconferencing, online games and IPTV. This paper deals with QoS provisioning in XCAST networks using Differentiated Services (DiffServ). We show that integration of DiffServ in XCAST is a non-trivial problem due to inherent architectural differences between XCAST and DiffServ. We then propose a scheme called QS-XCAST that uses dynamic DSCPs to adapt to the heterogeneity of receivers in an XCAST network. We also provide an algorithm for harmonizing the receiver-driven and sender-driven QoS approaches between XCAST and DiffServ thereby determining the correct DSCP-PHB for all links in an XCAST network. By simulating using OMNeT++ we evaluate QS-XCAST using four metrics: throughput, average per-hop-delay, link utilization and forwarding fairness to other traffic in the network. Our solution eliminates DSCP confusion and collusion attack problems to which naive XCAST QoS provisioning is vulnerable. It also offers a more efficient bandwidth utilization, better forwarding fairness and less traffic load compared to the existing XCAST.------------------------------This is a preprint of an article intended for publication Journal ofInformation Processing(JIP). This preprint should not be cited. Thisarticle should be cited as: Journal of Information Processing Vol.21(2013) No.1 (online)DOI http://dx.doi.org/10.2197/ipsjjip.21.131------------------------------

Adaptation of Integrity Maintenance Method for Location Estimation to Large Scale Wireless LAN Observation Database International conference

He Tao, Kaji Katsuhiko, Kawaguchi Nobuo

The Institute of Electronics, Information and Communication Engineers

Event date： 2011.11

Language：Japanese Presentation type：Oral presentation (general)

Country：Japan

We have operated a portai Locky.jp on location information and estimation using wireless LAN. It is possible to estimate the current location based on the database of wireless LAN information observed and submitted by general users. However, the failure in wireless LAN observation, together with the base station which has been moved, base station in Shinkansen, and mobile WiFi, would cause adverse effect in accuracy of location estimation if they did not have the proper handle. In this paper, intended with the large base station database collected by Locky.jp, we detect the failure in wireless LAN observation and base station which has been moved, and fix them to maintain the integrity of wireless LAN database. The results of evaluation confirmed the improvement of the location estimation accuracy with applying these corrections.

Constructing and Collecting Indoor Structural Map Data with Crowdsourcing International conference

SUZUKI Yuki, KAJI Katsuhiko, KAWAGUCHI Nobuo

The Institute of Electronics, Information and Communication Engineers

Event date： 2011.11

Language：Japanese Presentation type：Oral presentation (general)

Country：Japan

Currently, there are many indoor positioning researches using wireless LAN etc. However, there is no wide existance of structural map information on buildings or underground centers that can be applied in indoor positioning. In order to implement indoor location-based services such navigation based on user location, indoor map information is required. Moreover, indoor map information is also useful in the development of research in indoor positioning. This research aims at widely collecting indoor structure map information based on floor map pictures from sources such websites and a the guidance information for an institution through crowdsourcing approach. This paper describes a series of flows, such as acquisition of a floor map, automatic structuring, modification of users, concentration of structural information, and sharing of structural information. It also describes the system which used in supporting this approach. In addition, details of the contents of structural information are also given.

HASC Corpus: Large Scale Human Activity Corpus for the Real-World Activity Understandings Invited International conference

2011.10.9

Instant Learning Sound Sensor: Flexible Real-World Event Recognition System for Ubiquitous Computing International conference

Ubiquitous Computing Systems, 4th International Symposium(UCS 2007)

Locky.jp：無線LANを用いた位置推定とその応用

電子情報通信学会　ITS研究会

ユビキタス最前線

河口信夫

名古屋大学協力会　情報通信セミナー

無線LANを用いた位置情報ポータルLocky.jpとその応用

河口信夫

Place XML成果報告会

次世代ユビキタスネットワークを探る

河口信夫

2006年度名古屋大学公開講座

XCAST技術とその応用　-多地点接続の実現-

INTEROP2006 カンファレンス

XCAST技術とその応用

河口信夫

中国JGN2・ICTフォーラム

東海地域におけるJGN2コミュニティネットワークの活動について

河口信夫

JGN2シンポジウム，JGN2利用促進部会

Dialogue Structure Annotation of In-car Speech Corpus based on Speech-Act Tag International conference

ユビキタス社会における無線ＩＣタグの応用と将来像

河口信夫

新産業チャレンジ交流会（中小企業支援センター）

Orientation Estimation Method and Orientation-Location Based Service Using Wireless LAN International conference

無線ＬＡＮの電波強度分布類似度を用いた方向推定手法

伊藤誠悟，佐藤弘和，河口信夫

ユビキタス社会におけるヒューマンインタフェース像と基盤ソフトウェア

河口信夫

次世代ヒューマンインタフェース研究会＠富山工業技術センター

エコ・ユビキタス環境の構築に向けて－ユビキタス基盤ソフトウェア－

河口信夫

ファインセラミックスシンポジウム2004

cogma : ユビキタス情報環境を構築する基盤ソフトウェア

河口信夫

FIT2004

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