Yoshinori Hijikata

マイクロブログサービスの1つであるTwitterでは,その時々で話題になる政治家や芸能人など有名人に関する一般ユーザの発言を豊富に得ることができる.さらに近年では,SNSから得られる評判情報をマーケティングやその他サービスに応用しようという試みが活発に行われている.そこで本研究では,Twitterから得られる評判情報のうち,一般ユーザの有名人に関する発言とその発言を行ったユーザのプロフィール等に着目する.これらの各情報源から得られるデータに対し,抽出の妨げとなるノイズへの前処理を経て,一般ユーザの観点が反映された特徴量であるトピックの抽出を行う.そして得られたトピックの分布を元に人物の類似関係を獲得し,それを基に各人物を平面上に配置することで,人物関係の可視化を行う.この可視化結果に対しては使用した情報源毎に妥当性と発見性に着目して特徴の分析を行う.

マイクロブログサービスの 1 つである Twitter では，その時々で話題になる政治家や芸能人など有名人に関する一般ユーザの発言を豊富に得ることができる．さらに近年では，SNS から得られる評判情報をマーケティングやその他サービスに応用しようという試みが活発に行われている．そこで本研究では，Twitter から得られる評判情報のうち，一般ユーザの有名人に関する発言とその発言を行ったユーザのプロフィール等に着目する．これらの各情報源から得られるデータに対し，抽出の妨げとなるノイズへの前処理を経て，一般ユーザの観点が反映された特徴量であるトピックの抽出を行う．そして得られたトピックの分布を元に人物の類似関係を獲得し，それを基に各人物を平面上に配置することで，人物関係の可視化を行う．この可視化結果に対しては使用した情報源毎に妥当性と発見性に着目して特徴の分析を行う．

マイクロブログサービスの 1 つである Twitter では，その時々で話題になる政治家や芸能人など有名人に関する一般ユーザの発言を豊富に得ることができる．さらに近年では，SNS から得られる評判情報をマーケティングやその他サービスに応用しようという試みが活発に行われている．そこで本研究では，Twitter から得られる評判情報のうち，一般ユーザの有名人に関する発言とその発言を行ったユーザのプロフィール等に着目する．これらの各情報源から得られるデータに対し，抽出の妨げとなるノイズへの前処理を経て，一般ユーザの観点が反映された特徴量であるトピックの抽出を行う．そして得られたトピックの分布を元に人物の類似関係を獲得し，それを基に各人物を平面上に配置することで，人物関係の可視化を行う．この可視化結果に対しては使用した情報源毎に妥当性と発見性に着目して特徴の分析を行う．

Recently, the turn volume of music data on the Internet has increased rapidly. This has increased the user's cost to find music data suiting their preference from such a large data set. We propose a content-based music search and recommendation system. This system has an interface for searching and finding music data and an interface for editing a user profile which is necessary for music recommendation. By exploiting the visualization of the feature space of music and the visualization of the user profile, the user can search music data and edit the user profile. Furthermore, by exploiting the infomation which can be acquired from each visualized object in a mutually complementary manner, we make it easier for the user to search music data and edit the user profile. Concretely, the system gives to the user an information obtained from the user profile when searching music data and an information obtained from the feature space of music when editing the user profile.

This paper describes the flow and process of information in disaster prevention centers for emergency. There is a possibility that people will use e-mails from mobile phones in the future to report to disaster prevention centers the status of the real place where the disaster has attacked. We propose an information management system for disaster prevention centers. In this system, the abstract of the status in the real place are summarized and provided to users from the acquired information. The contributions of this system are displaying the following three types of information on a map of GIS : (I) information summarized from the view point of content, (ii) information about information uncharted area automatically found, (iii) information about the process of information in the organization.

The technologies for telecommunication, GPS, and mobile GIS have rapidly progressed in the last few years. They will allow us to access to the Internet at any time and any place. A user needs to acquire information easily and correctly through a web browser on a cell-phone or a PDA. Our purpose is to build a system providing blog pages written about a facility for a user who is standing in front of the facility. The user can see these blog pages through the web browser on his cell-phone. The system has two technical features. One is extracting users' goals of using facilities from a common sense database. The other is filtering blog pages based on the goal selected by the user.

The technologies for telecommunication, GPS, and mobile GIS have rapidly progressed in the last few years. They will allow us to access to the Internet at any time and any place. A user needs to acquire information easily and correctly through a web browser on a cell-phone or a PDA. Our purpose is to build a system providing blog pages written about a facility for a user who is standing in front of the facility. The user can see these blog pages through the web browser on his cell-phone. The system has two technical features. One is extracting users' goals of using facilities from a common sense database. The other is filtering blog pages based on the goal selected by the user.

Users cannot search information by mathematical formulas as queries in existing search engines. This is because mathematical formulas are not expressed in text in a row. Some formulas are expressed in a complex structure like fractional numbers and index numbers. We proposed a search engine for MathML objects using the structure of mathematical formulas. The system makes the inverted indices by using the DOM structure of the MathML object. We also proposed some indices for this system. We conducted an experiment to see the effectiveness of those indices by using the mathematical contents which are open to the public on the Internet.

Users cannot search information by mathematical formulas as queries in existing search engines. This is because mathematical formulas are not expressed in text in a row. Some formulas are expressed in a complex structure like fractional numbers and index numbers. We proposed a search engine for MathML objects using the structure of mathematical formulas. The system makes the inverted indices by using the DOM structure of the MathML object. We also proposed some indices for this system. We conducted an experiment to see the effectiveness of those indices by using the mathematical contents which are open to the public on the Internet.