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References Navigation arrow Authors Navigation arrow Rul Gunzenhauser
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Rul Gunzenhauser

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Publications by Rul Gunzenhauser (bibliography)

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» 1999 «

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Ressel, Matthias and Gunzenhauser, Rul (1999): Reducing the Problems of Group Undo. In: Proceedings of the International ACM SIGGROUP Conference on Supporting Group Work 1999 November 14-17, 1999, Phoenix, Arizona, USA. pp. 131-139. Available online

“Providing undo functionality in groupware has been identified as an important, but difficult problem. Existing solutions show deficiencies like lacking generality, being too complex, being inefficient, or failing to yield acceptable results in common situations. In this paper we describe a new approach which reduces local group undo to a transformation-based method for combining the effects of concurrently issued user commands. Besides transformations we introduce mirror and folding operators in order to build a unique and consistent multidimensional model of the user interaction. In this way the problems of group undo mentioned above can be either overcome or at least reduced.”

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» Interaction Design Patterns: [/encyclopedia/interaction_design_patterns.html]


» 1996 «

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Ressel, Matthias, Nitsche-Ruhland, Doris and Gunzenhauser, Rul (1996): An Integrating, Transformation-Oriented Approach to Concurrency Control and Undo in Group Editors. In: Olson, Gary M., Olson, Judith S. and Ackerman, Mark S. (eds.) Proceedings of the 1996 ACM conference on Computer supported cooperative work November 16 - 20, 1996, Boston, Massachusetts, United States. pp. 288-297. Available online

“Concurrency control and group undo are important issues in the design of groupware, especially for interactive group editors. We present an improved version of an existing distributed algorithm for concurrency control that is based on operation transformations. Since the usability of the algorithm relies on its formal correctness, we present a set of necessary and sufficient conditions to be satisfied in order to ensure consistency in a replicated architecture. We identify desirable properties of operation transformations and show how our approach can be employed to implement group undo. The approach has been applied to build a prototypical group editor for text; some experiences gained are presented.”

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Changes to this page (author)

18 Feb 2010: Enabled abstracts to be shown on Rul Gunzenhauser's author page.
28 Apr 2003: Added the author to the bibliography

Publication statistics

Publication period:1996-1999
Publication count:2
Number of co-authors:2



Productive colleagues

Rul Gunzenhauser's 3 most productive colleagues in number of publications:

Matthias Ressel:6
Doris Nitsche-Ruhland:1


Collaboration count

Number of publications with 3 favourite co-authors:

Matthias Ressel:2
Doris Nitsche-Ruhland:1

 

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Mar 17

“ More and more we're being asked to live with technology that is technically reliable, because it was created to fit our knowledge of the physical world, but that is so complex or so counterintuitive that it's actually unusable by most human beings. ”

-- Kim Vicente, The Human Factor, p. 17. ”

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