Faculty Profiles - KAWAGUCHI, Nobuo

Papers - KAWAGUCHI, Nobuo

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Design and Implementation of WiFi Indoor Localization based on Gaussian Mixture Model and Particle Filter Reviewed

Katsuhiko Kaji, Nobuo Kawaguchi

2012 INTERNATIONAL CONFERENCE ON INDOOR POSITIONING AND INDOOR NAVIGATION (IPIN) page： 1 - 9 2012

Language：English Publishing type：Research paper (international conference proceedings) Publisher：IEEE

Up to now Scene Analysis has been based on the WiFi location estimation technique and it has been necessary to have a large scale database and a large amount of calculation. We propose a WiFi estimation method that uses little data or calculation. First of all we apply Gaussian Mixture Model to represent the large scale WiFi database to decrease the WiFi data by no less than 95%. Secondly, we apply Particle Filter to adjust the possible calculation quantity needed for the location estimation technique. As experimental result, we achieved real-time location estimation within 6 similar to 10m. Another important issue for Scene Analysis technique is the high cost of operation of the previous WiFi observation. Accordingly crowdsourcing approach was used, employing as system where some users could contribute and other uses could share. The ideal system is a composition of the Web and mobile terminal. WiFi data observed by mobile terminals is uploaded to a Web server where it is managed and integrated into GMM and large scale operations are carried out on data and calculations. When the lightweight modeled data is downloaded to the mobile-terminal, the mobile terminal then has the ability to carry out real-time location estimation independently.

DOI： 10.1109/IPIN.2012.6418943

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External device session initiation framework using mobile phone connection information Reviewed

Toshiharu Asai, Katsuhiko Kaji, Nobuo Kawaguchi

Asian Internet Engineeering Conference, AINTEC 2012 page： 55 - 61 2012

Language：English Publishing type：Research paper (international conference proceedings) Publisher：ACM

Recent advancement of communications systems enables that any person can easily connect to others using network devices. However, it is still bothering to setup an external device to communicate with other devices. This paper proposes a framework for external device session initiation using a mobile phone connection information. To overcome the complex configuration issues, we employ several global servers for session initiation. By using connection information of a mobile phone, one can easily connect an external device with other device without setting any connection information. By using the framework, we have developed a prototype which can easily connect Kiosk video terminal with other device just facing an Android smartphone with NFC feature over the Kiosk terminal. We have counted the steps required to the user for the session initiation, and confirm the framework overcomes the issues. Copyright 2012 ACM.

DOI： 10.1145/2402599.2402607

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Other Link： http://dblp.uni-trier.de/db/conf/aintec/aintec2012.html#conf/aintec/AsaiKK12

A Proposal of Landmark-conscious Voice Navigation Reviewed

河口信夫

The Sixth International Conference on Mobile Computing and Ubiquitous Networking(ICMU 2012) page： 56 - 61 2012

A Proposal of Landmark-conscious Voice Navigation Reviewed

河口信夫

The Sixth International Conference on Mobile Computing and Ubiquitous Networking(ICMU 2012) page： 56 - 61 2012

App.Locky:コンテキスト依存型サービス推薦を目的としたユーザ状況収集プラットフォーム Reviewed

矢野幹樹，梶克彦，河口信夫

情報処理学会論文誌 Vol. 52 ( 12 ) page： 3274-3288 2011.12

Language：Japanese Publishing type：Research paper (scientific journal)

モバイル端末向けに提供されるWeb サービスやアプリケーションなどのサービス
の数は爆発的に増加しており，膨大な数のサービスの中から自分に必要な物を探し出
すことが困難となりつつある．我々は，ユーザの状況に応じてサービスの推薦を行う
システムの実現を目指す．推薦を実現する上で必要となる学習情報の獲得を行うため
に，現在状況をクエリとするアプリ検索サービスを提供し，ユーザ状況の収集から推
薦までを行うプラットフォームを提案する．提案に基づいた状況依存型アプリ検索シ
ステム「App.Locky」の実装を行い，インターネット上にて公開した上で，実ユーザ
を対象とした大規模検索ログ収集実験を行った．実験の結果，収集された検索ログを
ユーザ状況の推定に利用可能であることを確認した．

indoor.Locky: UGCを利用した無線LAN 屋内位置情報基盤 Reviewed

梶克彦，河口信夫

情報処理学会論文誌 Vol. 52 ( 12 ) page： 3263-3273 2011.12

Language：Japanese Publishing type：Research paper (scientific journal)

我々は，様々な建物において屋内位置情報を一般に利用できる環境の実現を目指し，
GMM に基づく無線LAN 位置推定技術を用いた屋内位置情報基盤indoor.Locky の
研究開発を行っている．本基盤の実用化に向けた最も大きな問題は，一般ユーザが行
う事前の無線LAN 観測の作業コストが高いという点である．そこで，この作業を複
数ユーザで分担できるようUGC(User Generated Content) のアプローチを採用す
る．商業施設に置いて実証実験を行い，複数ユーザの観測情報がWeb サービス側で
正常に統合されることを確認した．また最も作業コストと位置推定精度のバランスが
とれた観測地点の間隔が5m 程度であることを明らかにした．これにより，一般ユー
ザが行う観測作業の適切な間隔を提示可能になるため，多くの箇所の観測を行ってし
まい作業コストが必要以上増加してしまうのを防ぐことができる．

Constructing and Collecting Indoor Structural Map Data with Crowdsourcing

SUZUKI Yuki, KAJI Katsuhiko, KAWAGUCHI Nobuo

IEICE technical report Vol. 111 ( 296 ) page： 1-6 2011.11

Language：English Publishing type：Research paper (scientific journal)

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.

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

He Tao, Kaji Katsuhiko, Kawaguchi Nobuo

IEICE technical report Vol. 111 ( 296 ) page： 13 - 18 2011.11

Publishing type：Research paper (scientific journal) Publisher：The Institute of Electronics, Information and Communication Engineers

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.

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

HE Tao, KAJI Katsuhiko, KAWAGUCHI Nobuo

Vol. 111 ( 296 ) page： 13-18 2011.11

Constructing and Collecting Indoor Structural Map Data with Crowdsourcing

SUZUKI Yuki, KAJI Katsuhiko, KAWAGUCHI Nobuo

Vol. 111 ( 296 ) page： 1-6 2011.11

Large Scale Data Processing on the Ubiquitous Systems : From the Experience of Locky.jp

KAWAGUCHI Nobuo

IEICE technical report. Data engineering Vol. 111 ( 173 ) page： . 2011.7

Language：English Publishing type：Research paper (scientific journal)

Locky.jp project handles more than 1 million WiFi AP information which is extracted from 100 million crowd sourced data. Our smart phone applications which include "Eki.Locky" are downloaded over 1 million times. By serving such services, we get huge amount of usage data. There are several frameworks to handle this kind of huge information. However, there is no mature technology to handle them. In this talk, I'll introduce our case-study and current study about heterogeneous data handling.

HASC Challenge2010 :人間行動理解のための装着型加速度センサデータコーパスの構築 Reviewed

KAWAGUCHI Nobuo, OGAWA Nobuhiro, IWASAKI Yohei, KAJI Katsuhiko, TERADA Tsutomu, MURAO Kazuya, INOUE Sozo, KAWAHARA Yoshihiro, SUMI Yasuyuki, NISHIO Nobuhiko

情報処理学会マルチメディア，分散，協調とモバイルシンポジウム (DICOMO 2011) 論文集 Vol. 2011 ( 1 ) page： 69 - 75 2011.7

Design, Implementation and Evaluation of a Routing Engine for a Multipoint Communication Protocol: XCAST6 Reviewed

Odira Elisha Abade, Katsuhiko Kaji, Nobuo Kawaguchi

International Journal of Computer Science and Network Security Vol. 11 ( 5 ) page： 200-209 2011.5

Language：English Publishing type：Research paper (scientific journal)

In this paper we therefore propose an "XCAST6 Routing Engine", an out-of-the-box solution that simplifies gradual deployment of XCAST in the real-world. The contribution of this paper is two fold. We not only provide a simple solution that can hasten deployment of XCAST on the real Internet but we also exemplify through experimental performance evaluation of our
solution with respect to a number of performance and resource utilization metrics, that contrary to other perceptions, XCAST does not actually add an extra ordinary load to the routing resources.

A Streaming Video Augmentation Method for Improving Visibility of the Content

KAJI KATSUHIKO, KAWAGUCHI NOBUO

IEICE technical report Vol. 111 ( 50 ) page： 75-82 2011.5

Language：English Publishing type：Research paper (scientific journal)

Recently, demand of presentation video is increasing so that various conferences provide the streaming service of presentation video. In many cases, presentation slides and posters in the streaming video are not so visible because of various reasons such as low resolution and distortion. Users cannot understand the presentation clearly in such situation. In this paper, we propose a streaming video augmentation method to improve the visibility of the content in the streaming video. In the method, the client downloads the original data of the content in the streaming video previously. Then, in the watching phase, the image generated from original data is superimposed at the location of the content area in the streaming video. We implemented poster presentation live streaming system. We also conducted experiment of the system. In result, we found out that the system improve the visibility of poster in the streaming video, and reduce the flustration of watching the video.

Gaussian Mixture Modelを用いた無線LAN位置推定手法 Reviewed

藤田迪，梶克彦，河口信夫

情報処理学会論文誌 Vol. 52 ( 3 ) page： 1069-1081 2011.3

HASC challenge: Gathering large scale human activity corpus for the real-world activity understandings Reviewed

Nobuo Kawaguchi, Nobuhiro Ogawa, Yohei Iwasaki, Katsuhiko Kaji, Tsutomu Terada, Kazuya Murao, Sozo Inoue, Yoshihiro Kawahara, Yasuyuki Sumi, Nobuhiko Nishio

ACM International Conference Proceeding Series ( Article 27 ) page： 27 2011

Language：English Publishing type：Research paper (international conference proceedings) Publisher：ACM

Understandings of human activity through wearable sensors will enable the next-generation human-oriented computing. However, most of researches on the activity recognition so far are based on small number of test subjects, and not well adapted for real world applications. To overcome the situation, we have started a project named "HASC Challenge" to collect a large scale human activity corpus. By the end of 2010, by the collaboration of 20 teams, more than 6700 accelerometer data with 540 subjects have been collected through our project. We also developed a tool named "HASC Tool" for management, evaluation and collection of the large number of activity sensor data. Copyright 2011 ACM.

DOI： 10.1145/1959826.1959853

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Other Link： http://dblp.uni-trier.de/db/conf/aughuman/aughuman2011.html#conf/aughuman/KawaguchiOIKTMIKSN11

HASC2011corpus: Towards the Common Ground of Human Activity Recognition

Kawaguchi Nobuo, Yang Ying, Yang Tianhui, Ogawa Nobuhiro, Iwasaki Yohei, Kaji Katsuhiko, Terada Tsutomu, Murao Kazuya, Inoue Sozo, Kawahara Yoshihiro, Sumi Yasuyuki, Nishio Nobuhiko

UBICOMP'11: PROCEEDINGS OF THE 2011 ACM INTERNATIONAL CONFERENCE ON UBIQUITOUS COMPUTING page： 571-572 2011

Distributed Human Activity Data Processing using HASC Tool

Kawaguchi Nobuo, Ogawa Nobuhiro, Iwasaki Yohei, Kaji Katsuhiko

UBICOMP'11: PROCEEDINGS OF THE 2011 ACM INTERNATIONAL CONFERENCE ON UBIQUITOUS COMPUTING page： 603-604 2011

Quantitative simulation of XCAST6 performance using OMNeT++ Reviewed

Odira Elisha Abade, Katsuhiko Kaji, Nobuo Kawaguchi

Asian Internet Engineeering Conference, AINTEC 2011 page： 22 - 29 2011

Language：English Publishing type：Research paper (international conference proceedings) Publisher：ACM

Explicit multiunicast (XCAST) is a form of small group multicast in which the sender embeds IP addresses of all receiving nodes in a special header and sends it with all data packets. On sending, each XCAST-aware router in the path examines the packet and partitions the destinations into various sets based on their next hops. For each set, the router uses a bitmap in the packet header to ensure that each copy of the packet is delivered only to destinations whose corresponding bits in the bitmap are set to 1. Sometimes real world implementation of XCAST6 can take a long time to deploy and resource constraints can limit the scale of testing that can be done. We have therefore integrated XCAST6 into the IPv6 stack of INET Framework for OMNeT++ to allow for large-scale, exhaustive and realistic investigation of XCAST6 characteristics and to complement our current research into real world deployment of XCAST6. The contribution of this paper is two fold. First, it describes our implementation of XCAST6 in OMNeT++'s INET framework. Secondly, it experimentally shows the effectiveness of XCAST6 with regards to various multicast performance metrics such as stress, end-to-end delay, efficiency and packet processing overhead rate.

DOI： 10.1145/2089016.2089021

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Other Link： http://dblp.uni-trier.de/db/conf/aintec/aintec2011.html#conf/aintec/AbadeKK11

Gaussian Mixture Modelを用いた無線LAN位置推定手法 Reviewed

藤田迪, 梶克彦, 河口信夫

情報処理学会論文誌 Vol. 52 ( 3 ) page： 1069 - 1081 2011

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Papers - KAWAGUCHI, Nobuo