Number of co-authors:28
Number of publications with 3 favourite co-authors:Ken-ichi Okada:13Tomoo Inoue:3Shinkuro Honda:3
Yutaka Matsushita's 3 most productive colleagues in number of publications:Ken-ichi Okada:23Tomoo Inoue:8Satoshi Ichimura:5
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Publications by Yutaka Matsushita (bibliography)
Shiozawa, Hidekazu, Okada, Ken-ichi and Matsushita, Yutaka (1999): Perspective Layered Visualization of Collaborative Workspaces. In: Proceedings of the International ACM SIGGROUP Conference on Supporting Group Work 1999 November 14-17, 1999, Phoenix, Arizona, USA. pp. 71-80. Available online
Visual shared workspaces will be always staying on users' screens in the near future. Users will be moving frequently between their personal workspaces for personal and asynchronous work and shared workspaces for communication and synchronous cooperation. Also the system should supports users' everyday awareness of co-workers. For supporting such situation, this paper proposes a new technique to visualize workspaces as a set of layered virtual screens in three-dimensional space. In this way, groups' shared spaces are shown as background of users' personal spaces like as looking from a top personal layer down to a bottom public layer. In conventional groupware, user's workspace is divided into some shared spaces and a personal space to show all of them simultaneously, so the size of the personal space is very restricted. This layered perspective visualization alleviates this problem and also supports users' awareness by always showing shared spaces in background.
© All rights reserved Shiozawa et al. and/or ACM Press
Inoue, Tomoo, Okada, Ken-ichi and Matsushita, Yutaka (1999): Effects of Video Expression in Videoconferencing. In: HICSS 1999 1999. . Available online
Shiozawa, Hidekazu, Okada, Ken-ichi and Matsushita, Yutaka (1999): 3D Interactive Visualization for Inter-Cell Dependencies of Spreadsheets. In: InfoVis 1999 1999. pp. 79-. Available online
Honda, Shinkuro, Tomioka, Hironari, Kimura, Takaaki, Ohsawa, Takaharu, Okada, Ken-ichi and Matsushita, Yutaka (1997): A Virtual Office Environment Based on a Shared Room Realizing Awareness Space and Transmitting Awareness Information. In: Robertson, George G. and Schmandt, Chris (eds.) Proceedings of the 10th annual ACM symposium on User interface software and technology October 14 - 17, 1997, Banff, Alberta, Canada. pp. 199-207. Available online
In this paper, we describe a system that provides a "work-at-home" environment based on a virtual shared room built on a 3D graphics workstation. We realize "Awareness Space" on the system to avoid a tradeoff between providing facility of informal communication and keeping one's workspace from others' awareness information. Also, this system provides the feeling of the presence at virtual office by using "Around View" and "Sound Effect".
© All rights reserved Honda et al. and/or ACM Press
Honda, Shinkuro, Tomioka, Hironari, Kimura, Takaaki, Oosawa, Takaharu, Okada, Ken-ichi and Matsushita, Yutaka (1997): Valentine: An Environment for Home Office Worker Providing Informal Communication and Personal Space. In: Payne, Stephen C. and Prinz, Wolfgang (eds.) Proceedings of the International ACM SIGGROUP Conference on Supporting Group Work 1997 November 11-19, 1997, Phoenix, Arizona, USA. pp. 368-375. Available online
In this paper, we propose the virtual office environment which integrates the natural communication and the secure private space. The features of this system are described below. 1) This system has virtual shared room which is based on the idea of "Shared Room Metaphor". 3D graphics on SGI workstation is used for this system. It uses Ethernet (TCP/IP) for signal connection and FDDI (UDP/IP) for continuous media (i.e., realtime audio/video streams). 2) This system realizes the field of view of human being to support natural communication between members by using our "Around View" technique. 3) "Sound Effect" are also used to help users feel the presence of other members. For instance, members hear the opening-sound of the door when someone logs in our system and the sound of footsteps when someone is walking around our virtual room. 4) Sometimes this system avoids unlimited flow of awareness. A person concentrating his/her work may not want to perceive excessive awareness of others. To support such situation, we define "Awareness Space" which restricts the field where other member's awareness is transmitted. Awareness Space changes in size with the degree of concentration which is measured through two factors; the movement of a chair and the frequency of keyboard typing. 5) "Headphone Metaphor"; a picture of headphone is attached above his/her image and changed its color depending on the degree of concentration. The view of this headphone enables other members to recognize his/her state and it can be a criterion he is available to communicate or not.
© All rights reserved Honda et al. and/or ACM Press
Inoue, Tomoo, Okada, Ken-ichi and Matsushita, Yutaka (1997): Integration of Face-to-Face and Video-Mediated Meetings: HERMES. In: Payne, Stephen C. and Prinz, Wolfgang (eds.) Proceedings of the International ACM SIGGROUP Conference on Supporting Group Work 1997 November 11-19, 1997, Phoenix, Arizona, USA. pp. 405-414. Available online
The design and evaluation of HERMES, the videoconferencing system that integrates face-to-face and video-mediated meetings, are presented. Spatial design of the meeting space with an automatic video control mechanism was employed to support both local and remote communication. The evaluation of the system revealed that the design was effective in solving the problematic behavior that participants tend to fix their eyes on the monitor when they use a conventional system with lined up seats.
© All rights reserved Inoue et al. and/or ACM Press
Shiozawa, Hidekazu and Matsushita, Yutaka (1997): WWW Visualization Giving Meanings to Interactive Manipulations. In: Smith, Michael J., Salvendy, Gavriel and Koubek, Richard J. (eds.) HCI International 1997 - Proceedings of the Seventh International Conference on Human-Computer Interaction - Volume 2 August 24-29, 1997, San Francisco, California, USA. pp. 791-794.
Honda, Shinkuro, Kimura, Takaaki, Tomioka, Hironari, Oosawa, Takaharu, Okada, Ken-ichi and Matsushita, Yutaka (1997): A Virtual Office Environment for Supporting Informal Communications and Securing Personal Space. In: Smith, Michael J., Salvendy, Gavriel and Koubek, Richard J. (eds.) HCI International 1997 - Proceedings of the Seventh International Conference on Human-Computer Interaction - Volume 2 August 24-29, 1997, San Francisco, California, USA. pp. 909-912.
Zhao, Jiying, Shimazu, Yoshihisa, Ohta, Koji, Hayasaka, Rina and Matsushita, Yutaka (1996): A JPEG Codec Adaptive to Region Importance. In: ACM Multimedia 1996 1996. pp. 209-218.
Ichikawa, Yusuke, Okada, Ken-ichi, Jeong, Giseok, Tanaka, Shunsuke and Matsushita, Yutaka (1995): MAJIC Videoconferencing System: Experiments, Evaluation and Improvement. In: Marmolin, Hans, Sundblad, Yngve and Schmidt, Kjeld (eds.) ECSCW 95 - Proceedings of the Fourth European Conference on Computer-Supported Cooperative Work 11-15 September, 1995, Stockholm, Sweden. pp. 279-292.
We need to know the real intentions of participants that are not expressed by verbal languages. This means that not only verbal information but also non-verbal information (i.e., gestures, facial expression, eyes of participant, etc.) is a very important factor. We proposed and implemented MAJIC, a multi-party videoconferencing system that enables eye contact among people in remote places, with life-sized images of participants. In order to evaluate users' perceptions of MAJIC, we have experimented with the size, background and boundary of the video images. These experiments verify the sense of presence in MAJIC environments where life-size video images without boundaries are supported. We developed a new MAJIC prototype based on these experiments.
© All rights reserved Ichikawa et al. and/or Kluwer Academic Publishers
Inoue, Tomoo, Okada, Ken-ichi and Matsushita, Yutaka (1995): Learning from TV Programs: Application of TV Presentation to a Videoconferencing System. In: Robertson, George G. (ed.) Proceedings of the 8th annual ACM symposium on User interface and software technology November 15 - 17, 1995, Pittsburgh, Pennsylvania, United States. pp. 147-154. Available online
In this paper, we propose to direct the visual image of a videoconferencing system. Pictures of current videoconferencing systems are often boring. We thought presentation of pictures on TV and in movies should be studied to improve videoconferencing. For this purpose, we investigated several debate programs on TV. We classified all the shots into eight classes, and then determined the duration of each shot and the transition probabilities among the classes in order to describe the structure of TV programs. From this, rules to control pictures have been obtained. After that, we made a two-point multi-party videoconferencing system that utilizes the rules. The system includes automated control of changes in camera focus.
© All rights reserved Inoue et al. and/or ACM Press
Nishiyama, Haruhiko, Kin, Sumi, Yokoyama, Teruo and Matsushita, Yutaka (1994): An Image Retrieval System Considering Subjective Perception. In: Adelson, Beth, Dumais, Susan and Olson, Judith S. (eds.) Proceedings of the ACM CHI 94 Human Factors in Computing Systems Conference April 24-28, 1994, Boston, Massachusetts. pp. 30-36. Available online
Human interface plays an important role in information retrieval system. Visual information is a good man-machine communication medium. Therefore, it is necessary to design a visual interface to interpret the pictorial information. Such a visual interface provides user-friendly operations. It is important to design advanced image database systems from a visual aspect. The algorithms of image retrieval operations have to suit user's subjective viewpoint, such as a similarity measure, etc. This paper proposes an image retrieval scheme based on the assumption that end-users make use of image database systems. When a human being looks graphical materials like artistic paintings, he/she memorizes them using two patterns in his/her visual memory: the first pattern is that of looking roughly the whole image, the second is that of paying attention to specific objects such as a man or a desk. A user can divide the canvas into several area with appropriate color freely and put icons for representing objects. Moreover, the user can set detailed attributes of each object in order to reduce the number of candidates. Thus, by means of specifying the feature of a picture in the three levels (area, objects, attributes), an image retrieval system suited for humans' sense can be realized.
© All rights reserved Nishiyama et al. and/or ACM Press
Okada, Ken-ichi, Maeda, Fumihiko, Ichikawaa, Yusuke and Matsushita, Yutaka (1994): Multiparty Videoconferencing at Virtual Social Distance: MAJIC Design. In: Proceedings of the 1994 ACM conference on Computer supported cooperative work October 22 - 26, 1994, Chapel Hill, North Carolina, United States. pp. 385-393. Available online
This paper describes the design and implementation of MAJIC, a multi-party videoconferencing system that projects life-size video images of participants onto a large curved screen as if users in various locations are attending a meeting together and sitting around a table. MAJIC also supports multiple eye contact among the participants and awareness of the direction of the participants' gaze. Hence, users can carry on a discussion in a manner comparable to face-to-face meetings. We made video-tape recordings of about twenty visitors who used the prototype of MAJIC at the Nikkei Collaboration Fair in Tokyo. Our initial observations based on this experiment are also reported in this paper.
© All rights reserved Okada et al. and/or ACM Press
Kamita, Takeshi, Ichimura, Satoshi, Okada, Ken-ichi and Matsushita, Yutaka (1994): A Database Architecture and Version Control for Group Work. In: HICSS 1994 1994. pp. 438-447.
Ichimura, Satoshi and Matsushita, Yutaka (1993): Another Dimension to Hypermedia Access. In: Stotts, P. David and Furuta, Richard (eds.) Proceedings of ACM Hypertext 93 Conference November 14-18, 1993, Seattle, Washington. pp. 63-72. Available online
The OpenBook system using a book metaphor allows a user to leaf through a set of nodes retrieved from a hypermedia just like a book. While leafing through the book, the reader does not need to pay attention to the detailed description written in pages, but impressive information such as chapter titles and figures catches reader's eyes. In other words, leafing through an electronic book takes advantage of a cognitive capability to skim the outlines of the contents. Moreover, the system supports a query-based access mechanism which supports a structure search mechanism for the purpose of finding potentially useful nodes. Furthermore, this paper describes a method of linearizing complex hyper-networked nodes to facilitate high speed browsing, which is a unique aspect of OpenBook.
© All rights reserved Ichimura and Matsushita and/or ACM Press
Arai, Kyoichi, Yokoyama, Teruo and Matsushita, Yutaka (1992): A Window System with Leafing Through Mode: BookWindow. In: Bauersfeld, Penny, Bennett, John and Lynch, Gene (eds.) Proceedings of the ACM CHI 92 Human Factors in Computing Systems Conference June 3-7, 1992, Monterey, California. pp. 291-292. Available online
This paper describes "BookWindow" that we implemented, a window system based on the "book" metaphor, that displays information not by scrolling but by using the animation of paging through. The BookWindow system equips some bookmarks, tabs, etc, by which we can access to an expected page through our requirements. BookWindow can support our work environment which navigates us through information space flexibly, because human beings are quite familiar with "books".
© All rights reserved Arai et al. and/or ACM Press
Matsuura, Norihiko, Fujino, Go, Okada, Ken-ichi and Matsushita, Yutaka (1992): An Experimental Study of Encounters and Interactions in a Virtual Environment. In: East-West International Conference on Human-Computer Interaction: Proceedings of the EWHCI92 1992. pp. 276-286.
In this paper, we describe a new approach to the use of a virtual environment to support distributed collaborative work. We focus explicitly on tools to enable informal communications in contrast to most of the existing approaches of groupware applications. The establishment and maintenance of personal relationships is as indispensable in a virtual environment as in a physical environment, because the personal relationships lead to the acquisition of new communication channels and the probability of future joints. We describe the concept of interactions in a virtual environment and two sample tools for the 1 shared space in this virtual environment which provide the opportunities for spontaneous, informal encounters and interactions with both acquaintances and strangers in order to support the formation and maintenance of personal relationships.
© All rights reserved Matsuura et al. and/or Intl. Centre for Scientific And Technical Information
Okada, Ken-ichi, Kinoshita, Kaoru and Matsushita, Yutaka (1991): Scrolling or Leafing Through: Book Window. In: First Moscow International HCI91 Workshop Proceedings 1991. pp. 242-248.
Though human beings are good at managing and memorizing many objects spatially, we do not use the spatial information to retrieve the data by computer at present, since most computers can show the data on the screen area by scrolling or popping up the next frame. Such schemes cannot manage information spatially. In this paper, we describe the "BookWindow", a window system with leafing through pages, that shows information stored in a computer by using the animation of leafing through pages without scrolling. The BookWindow provides a highly interactive interface by using a book metaphor, that is, a speed controller and direction buttons for leafing through pages, underline function, and electronic bookmarks, by which we can access to an expected page through our recall of the page image. Thus using such a window system based on book metaphor, we can realize the features of book media electronically and improve our information access environment.
© All rights reserved Okada et al. and/or Intl. Centre for Scientific And Technical Information
Miyazawa, Mitsumasa, Kinoshita, Kaoru, Kobayashi, Minuro, Yokoyama, Teruo and Matsushita, Yutaka (1990): An Electronic Book: APTBook. In: Diaper, Dan, Gilmore, David J., Cockton, Gilbert and Shackel, Brian (eds.) INTERACT 90 - 3rd IFIP International Conference on Human-Computer Interaction August 27-31, 1990, Cambridge, UK. pp. 513-519.
This paper describes an electronic book named APTBook in which we can leaf through the pages of it, furthermore we can either paste it with a memopad, or make a dog-ear, underlines. Since this APTBook is realized by the hierarchical data structure in which the more upper layer has the more rough information, the system can show many pages in a short time by using the animation of leafing through the pages. Furthermore, we can access a page in which a photograph is located in the upper-right corner by an access method similar to the memory structure of human being based on spatial location, nevertheless existing electronic media cannot manage it. Thus by, using APTBook, we can access the data without using database access based on keywords.
© All rights reserved Miyazawa et al. and/or North-Holland
Matsushita, Yutaka (1972): Hidden Lines Elimination for a Rotating Object. In Communications of the ACM, 15 (4) pp. 245-252.
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