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Temporal Reasoning Based on SemiIntervals
, 1992
"... A generalization of Allen's intervalbased approach to temporal reasoning is presented. The notion of `conceptual neighborhood' of qualitative relations between events is central to the presented approach. Relations between semiintervals rather than intervals are used as the basic units of knowledg ..."
Abstract

Cited by 234 (14 self)
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A generalization of Allen's intervalbased approach to temporal reasoning is presented. The notion of `conceptual neighborhood' of qualitative relations between events is central to the presented approach. Relations between semiintervals rather than intervals are used as the basic units of knowledge. Semiintervals correspond to temporal beginnings or endings of events. We demonstrate the advantages of reasoning on the basis of semiintervals: 1) semiintervals are rather natural entities both from a cognitive and from a computational point of view; 2) coarse knowledge can be processed directly; computational effort is saved; 3) incomplete knowledge about events can be fully exploited; 4) incomplete inferences made on the basis of complete knowledge can be used directly for further inference steps; 5) there is no tradeoff in computational strength for the added flexibility and efficiency; 6) for a natural subset of Allen's algebra, global consistency can be guaranteed in polynomial time; 7) knowledge about relations between events can be represented much more compactly.
TimeDependent Generation of Minimal Sets of Spatial Descriptions
, 1995
"... Talking about a location within a geometrically represented environment implies the translation of coordinates into suitable natural language expressions. Therefore, a reference semantics anchored in the given geometry has to be developed in order to be able to describe spatial relations between obj ..."
Abstract

Cited by 6 (1 self)
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Talking about a location within a geometrically represented environment implies the translation of coordinates into suitable natural language expressions. Therefore, a reference semantics anchored in the given geometry has to be developed in order to be able to describe spatial relations between objects. Answering the question "Where is object X?" will lead to a large set of spatial propositions like "X is near Y", "X is to the right of Z" etc. Aiming for a description of the specified location which is both easily understood and highly informative for a human being, the elements of this set must be analysed with respect to the degrees of applicability, compatibility, uniqueness and facility to be memorized. Furthermore, the actual context as well as presumptions about the user's knowledge must be taken into account. Usually, in dialog situations it is a priori unknown how much time is given for the generation of an utterance. We therefore demonstrate a first approach of applying anyti...
In: Informatik '97, M Jarke, K Pasedach, K. Pohl (Hrsg.),
"... The paper gives a brief overview of the interdisciplinary DFG priority program on spatial cognition and presents one specific theme which was the topic of a recent workshop in Gttingen in some more detail. ..."
Abstract
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The paper gives a brief overview of the interdisciplinary DFG priority program on spatial cognition and presents one specific theme which was the topic of a recent workshop in Gttingen in some more detail.