Number of co-authors:46
Number of publications with 3 favourite co-authors:Yutaka Matsushita:13Tomoo Inoue:6Yuichi Bannai:4
Ken-ichi Okada's 3 most productive colleagues in number of publications:Jonathan Grudin:105Larry Press:52Allan MacLean:36
Not even the nascent state of the Web can excuse the amateurish lack of usability of today's eCommerce initiatives. The sites we evaluated demonstrated a fundamental failure to incorporate decades-old principles of software design. But as the novelty of doing business on the Web gives way to demands for basic quality, companies will have to get serious about user experience.
-- Sonderegger, Forrester Research, December 1999
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Publications by Ken-ichi Okada (bibliography)
Horiuchi, Yosuke, Inoue, Tomoo and Okada, Ken-ichi (2012): Virtual stage linked with a physical miniature stage to support multiple users in planning theatrical productions. In: Proceedings of the 2012 International Conference on Intelligent User Interfaces 2012. pp. 109-118.
Theater is a collaborative art form that involves production team members with different specialties. Because theater involves various technical elements, such as stage design and lighting, the production team must work in cooperation among various departments to design a theatrical production. When planning a theatrical production, it is difficult to visualize the stage as a whole and to incorporate the ideas of production team members from various departments. In this paper, we propose a system for reproducing the theatrical stage by means of a virtual stage linked to a physical miniature stage. The miniature stage is presented on a tabletop interface, and the virtual stage is created by computer graphics to reflect the actions on the miniature stage in real time. By actually presenting theatrical production ideas in two spaces, users can more easily collaborate and gain a comprehensive view of the stage.
© All rights reserved Horiuchi et al. and/or ACM Press
Noguchi, Daisuke, Sugimoto, Sayumi, Bannai, Yuichi and Okada, Ken-ichi (2011): Time characteristics of olfaction in a single breath. In: Proceedings of ACM CHI 2011 Conference on Human Factors in Computing Systems 2011. pp. 83-92.
The transmission of olfactory information together with audiovisual information is now attracting much attention. However, the information is difficult to synchronize because of problems of scent lingering in the air and olfactory adaptation. We aimed at minimizing the amount of odorant presented to users in order to mitigate these problems, and developed an olfactory display that is able to present scents precisely. The display uses pulse ejection, whereby scents are emitted for only short periods of time. In this study, we aimed to mitigate the above-mentioned problems and to measure the time characteristics of olfaction in a single breath, which are difficult to measure by conventional methods. As a result, the most effective conditions for using a small amount of odorant in a single breath were revealed. These results are expected to ease the synchronization of olfactory and audiovisual information.
© All rights reserved Noguchi et al. and/or their publisher
Takahashi, Yuki, Kojima, Hiroaki and Okada, Ken-ichi (2011): Injured person information management during second triage. In: Proceedings of the 2011 ACM Symposium on User Interface Software and Technology 2011. pp. 97-106.
In a large-scale disaster in which many persons are injured at the same time, triage has been introduced. Triage is a method that temporarily delays the treatment of people with mild to moderate injuries and symptoms and gives priority to those in a critical condition. In the process of multiple triage, more specific information is needed in the second triage compared to the first to accurately prioritize the persons injuries and state. To solve this problem we proposed and constructed a touch-based interface for managing information inserted during second triage. A touch-based tablet interface is introduced to specify wound areas and gestures for wound types. The information is shared wirelessly with all emergency personnel, giving medics shared, data-centric, visibility of overall triage status for the first time. The evaluation experiment shows that this proposed system enables to reduce input errors, speed up injured person care, and facilitate information sharing between medics efficiently. As a result, we believe that many more injured persons can and will be saved.
© All rights reserved Takahashi et al. and/or ACM Press
Sato, Junta, Ohtsu, Kaori, Bannai, Yuichi and Okada, Ken-ichi (2009): Effective Presentation Technique of Scent Using Small Ejection Quantities of Odor. In: IEEE Virtual Reality Conference 2009 VR 2009 14-18 March, 2009, Lafayette, Louisiana, USA. pp. 151-158.
Noguchi, Daisuke, Ohtsu, Kaori, Bannai, Yuichi and Okada, Ken-ichi (2009): Scent Presentation Expressing Two Smells of Different Intensity Simultaneously. In: Hirose, Michitaka, Schmalstieg, Dieter, Wingrave, Chadwick A. and Nishimura, Kunihiro (eds.) Proceedings of the Joint Virtual Reality Conference of EGVE - the 15th Eurographics Symposium on Virtual Environments - ICAT-EuroVR 2009, Lyon, France. pp. 53-60.
Yamamoto, Shun, Tamaki, Hidekazu, Okajima, Yuta, Okada, Ken-ichi and Bannai, Yuichi (2008): Symmetric Model of Remote Collaborative MR Using Tangible Replicas. In: IEEE Virtual Reality Conference 2008 VR 2008 8-12 March, 2008, Reno, Nevada, USA. pp. 71-74.
Ishido, Ryoko, Kitahara, Keigo, Inoue, Tomoo and Okada, Ken-ichi (2007): Evaluation of Content Handling Methods for Tabletop Interface. In: Jacko, Julie A. (ed.) HCI International 2007 - 12th International Conference - Part II July 22-27, 2007, Beijing, China. pp. 326-335.
Egi, Hironori, Anzai, Hisashi, Takata, Itaru and Okada, Ken-ichi (2007): A Fundamental Study for Participating in Multiple Teleconferences. In: Baranauskas, Maria Cecília Calani, Palanque, Philippe A., Abascal, Julio and Barbosa, Simone Diniz Junqueira (eds.) DEGAS 2007 - Proceedings of the 1st International Workshop on Design and Evaluation of e-Government Applications and Services September 11th, 2007, Rio de Janeiro, Brazil. pp. 183-196.
Inoue, Tomoo, Yamamoto, Yuri, Nakazawa, Keisuke, Shigeno, Hiroshi and Okada, Ken-ichi (2005): Proposal of a Map-Making System for Mobile Learning that Uses Subjective Geographic Recognition. In: ICALT 2005 - Proceedings of the 5th IEEE International Conference on Advanced Learning Technologies 05-08 July, 2005, Kaohsiung, Taiwan. pp. 677-678.
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.
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. .
Shiozawa, Hidekazu, Okada, Ken-ichi and Matsushita, Yutaka (1999): 3D Interactive Visualization for Inter-Cell Dependencies of Spreadsheets. In: InfoVis 1999 1999. pp. 79-.
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.
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.
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.
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
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.
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.
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
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.
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.
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
Cypher, Allen, Grudin, Jonathan, MacLean, Allan, Naimark, Michael, Okada, Ken-ichi, Patel, Mukesh, Press, Larry, Price, Blaine, Tarantola, Carlo and Welles, Marilyn (1991): The First Moscow International Workshop on Human-Computer Interaction. In ACM SIGCHI Bulletin, 23 (4) pp. 11-12.
The First Moscow International Workshop on Human-Computer Interaction gathered approximately 15 non-Soviet and 75 Soviet computer professionals for a week-long workshop at the International Center for Scientific and Technical Information (ICSTI) in Moscow. At this workshop, 50 paper presentations and 25 product and prototype demos were presented. This report provides a brief description of the workshop and opportunities for future interaction.
© All rights reserved Cypher et al. and/or ACM Press
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
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