Publication statistics

Pub. period:1992-1998
Pub. count:4
Number of co-authors:8


Number of publications with 3 favourite co-authors:

David Goldberg:
Brian M. Oki:
Douglas B. Terry:



Productive colleagues

David A. Nichols's 3 most productive colleagues in number of publications:

Michael Twidale:23
John Lamping:8
Douglas B. Terry:6

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David A. Nichols


Publications by David A. Nichols (bibliography)

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Twidale, Michael and Nichols, David A. (1998): Designing Interfaces to Support Collaboration in Information Retrieval. In Interacting with Computers, 10 (2) pp. 177-193.

Information retrieval systems should acknowledge the existence of collaboration in the search process. Collaboration can help users to be more effective in both learning systems and in using them. We consider how to build systems that more actively support collaboration. We describe a system that embodies just one kind of explicit support; a graphical representation of the search process that can be manipulated and discussed by users. A consideration of this system leads to an analysis of designing systems to support coping behaviour by users; including the need to support both help-giving by people, and recovery from the failure of intelligent agents. We also discuss the idea of interfaces as notations for supporting dialogues between people.

© All rights reserved Twidale and Nichols and/or Elsevier Science

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Nichols, David A., Curtis, Pavel, Dixon, Michael and Lamping, John (1995): High-Latency, Low-Bandwidth Windowing in the Jupiter Collaboration 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. 111-120.

Jupiter is a multi-user, multimedia virtual world intended to support long-term remote collaboration. In particular, it supports shared documents, shared tools, and, optionally, live audio/video communication. Users who program can, with only moderate effort, create new kinds of shared tools using a high-level windowing toolkit; the toolkit provides transparent support for fully-shared widgets by default. This paper describes the low-level communications facilities used by the implementation of the toolkit to enable that support. The state of the Jupiter virtual world, including application code written by users, is stored and (for code) executed in a central server shared by all of the users. This architecture, along with our desire to support multiple client platforms and high-latency networks, led us to a design in which the server and clients communicate in terms of high-level widgets and user events. As in other groupware toolkits, we need a concurrency-control algorithm to maintain common values for all instances of the shared widgets. Our algorithm is derived from a fully distributed, optimistic algorithm developed by Ellis and Gibbs [12]. Jupiter's centralized architecture allows us to substantially simplify their algorithm. This combination of a centralized architecture and optimistic concurrency control gives us both easy serializability of concurrent update streams and fast response to user actions. The algorithm relies on operation transformations to fix up conflicting messages. The best transformations are not always obvious, though, and several conflicting concerns are involved in choosing them. We present our experience with choosing transformations for our widget set, which includes a text editor, a graphical drawing widget, and a number of simpler widgets such as buttons and sliders.

© All rights reserved Nichols et al. and/or ACM Press

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Curtis, Pavel, Dixon, Michael, Frederick, Ron and Nichols, David A. (1995): The Jupiter Audio/Video Architecture: Secure Multimedia in Network Places. In: ACM Multimedia 1995 1995. pp. 79-90.

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Goldberg, David, Nichols, David A., Oki, Brian M. and Terry, Douglas B. (1992): Using Collaborative Filtering to Weave an Information Tapestry. In Communications of the ACM, 35 (12) pp. 61-70.

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