Number of co-authors:10
Number of publications with 3 favourite co-authors:Tan Hazama:3Takahiko Nomura:3Stephan Gudmundson:2
Koichi Hayashi's 3 most productive colleagues in number of publications:Riichiro Mizoguchi:7Sunao Hashimoto:4Takahiko Nomura:3
The evolution of HCI technology is a coevolution of HCI tasks and HCI artifacts: A task implicitly sets requirements for the development of artifacts to support; an artifact suggests possibilities and introduces constraints that often radically redefine the task for which the artifact was originally developed. [...] This dynamic relation, the task-artifact cycle, circumscribes the development activities of human-computer interaction
-- John M. Carroll, Wendy A. Kellogg, and Mary Beth Rosson in "The Task-Artifact Cycle" in Designing Interaction (1992)
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Publications by Koichi Hayashi (bibliography)
Hayashi, Koichi, Koguro, Naoki and Murakami, Reki (2005): Diversified SCM standard for the Japanese retail industry. In: Proceedings of the 2005 International Conference on the World Wide Web 2005. pp. 856-863.
In this paper, we present the concept of a diversified SCM (supply chain management) standard and distributed hub architecture which were used in B2B experiments for the Japanese retail industry. The conventional concept of B2B standards develops a single ideal set of business transactions to be supported. In contrast, our concept allows a wide range of diverse business transaction patterns necessary for industry supply chains. An industry develops a standard SCM model that partitions the whole supply chain into several transaction segments, each of which provides alternative business transaction patterns. For B2B collaboration, companies must agree on a collaboration configuration, which chooses the transaction alternatives from each segment. To support the development of a B2B system that executes an agreed collaboration, we introduce an SOA (service oriented architecture) based pattern called a distributed hub architecture. As a hub of B2B collaboration, it includes a complete set of services that can process every possible business transaction included in a standard SCM model. However, it does not function as a centralized service that coordinates participants. Instead, it is deployed on every participant and executes the assigned part of the supply chain collaboratively with other distributed hubs. Based on this concept, we analyzed actual business transactions in the Japanese retail industry and developed a standard SCM model, which represents more than a thousand possible transaction patterns. Based on the model, we developed an experimental system for the Japanese retail industry. The demonstration experiment involved major players in the industry including one of the largest general merchandise stores, one of the largest wholesalers, and major manufacturers in Japan.
© All rights reserved Hayashi et al. and/or ACM Press
Hayashi, Koichi and Mizoguchi, Riichiro (2003): Document exchange model for augmenting added value of B2B collaboration. In: Sadeh, Norman M., Dively, Mary Jo, Kauffman, Robert J., Labrou, Yannis, Shehory, Onn, Telang, Rahul and Cranor, Lorrie Faith (eds.) Proceedings of the 5th International Conference on Electronic Commerce - ICEC 2003 September 30 - October 03, 2003, Pittsburgh, Pennsylvania, USA. pp. 458-464.
Hayashi, Koichi, Hazama, Tan, Nomura, Takahiko, Yamada, Toshifumi and Gudmundson, Stephan (1999): Activity Awareness: Framework for sharing knowledge of people, projects, and places. In: Bødker, Susanne, Kyng, Morten and Schmidt, Kjeld (eds.) ECSCW 99 - Proceedings of the Sixth European Conference on Computer Supported Cooperative Work 12-16 September, 1999, Copenhagen, Denmark. p. 99.
Nomura, Takahiko, Hayashi, Koichi, Hazama, Tan and Gudmundson, Stephan (1998): Interlocus: Workspace Configuration Mechanisms for Activity Awareness. In: Poltrock, Steven and Grudin, Jonathan (eds.) Proceedings of the 1998 ACM conference on Computer supported cooperative work November 14 - 18, 1998, Seattle, Washington, United States. pp. 19-28.
This paper describes the concept of activity awareness, which enables workspace awareness without employing shared workspaces, and our framework for supporting activity awareness. Activity awareness extends the concept of asynchronous workspace awareness to provide asynchronous progress notifications and collective perspectives on related activities. Our framework adopts the temporally threaded workspace model, which tracks an activity in each individual's workspace by storing a sequence of snapshots of their workspace, and uses workspace configuration mechanisms to provide awareness functions. We then present Interlocus, an implementation of the framework in the WWW environment.
© All rights reserved Nomura et al. and/or ACM Press
Hayashi, Koichi, Nomura, Takahiko, Hazama, Tan, Takeoka, Makoto, Hashimoto, Sunao and Gumundson, Stephan (1998): Temporally Threaded Workspace: A Model for Providing Activity-Based Perspectives on Document Spaces. In: Hypertext 98 - Proceedings of the Ninth ACM Conference on Hypertext and Hypermedia June 20-24, 1998, Pittsburgh, PA, USA. pp. 87-96.
In this paper, we present a framework for providing activity-based perspectives of a document space, especially in the WWW. An activity-based perspective is a view of the subspace of the WWW document space that a knowledge worker should understand or modify while executing the activity. We designed the framework to reduce the cognitive overhead of managing document spaces dependent on various internal and external changes. Changes within the activity (often resulting from the natural progress of the activity) result in changes of focus in the subspace related to the activity. For such internal changes, we introduce a temporally-threaded workspace model. Our model introduces a structured workspace that maintains a thread of snapshots of a knowledge worker's perspective on a document space. Such threads of snapshots are constructed by monitoring user actions. External changes (for example, changes to documents managed in external sites) are independent of the progress of users' activities. To deal with these changes, we introduce a proxy mechanism to maintain documents in the same state as accessed. This paper also describes the implementation of prototype systems, in the WWW environment, based on our frameworks. Interlocus is a client/server system providing facilities based on the temporally-threaded workspace model. It provides a user interface that presents spatial-temporal views of a workspace thread. Packrat is a WWW proxy server that maintains documents in the same state as accessed.
© All rights reserved Hayashi et al. and/or ACM Press
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