منابع مشابه
Temporal Probabilistic Object Bases
There are numerous applications where we have to deal with temporal uncertainty associated with objects. For example, financial prediction programs often use complex object models and are parameterized by time and uncertainty (e.g., when will a given loan default?). Likewise, in transportation logistics, object models are used to describe objects involved in the transportation process (e.g., ve...
متن کاملAbteilung Wissensbasierte Systeme Probabilistic Object Bases
Though there are many applications where an object oriented data model is a good way of representing and querying data, current object database systems are unable to handle objects whose attributes are uncertain. In this paper, we extend previous pioneering work by Kornatzky and Shimony to develop an algebra to handle object bases with uncertainty. We propose concepts of consistency for such ob...
متن کاملTowards Probabilistic Knowledge Bases
We deene a new xpoint semantics for rule-based reasoning in the presence of vague or imprecise information. Such a semantics should fullll two requirements. First, it must coincide with the intuitive understanding of the given information, and second, the semantics must be computationally tractable. We show that our semantics fulllls the rst requirement and we formally verify that our xpoint se...
متن کاملProbabilistic Knowledge Bases
We deene a new xpoint semantics for rule-based reasoning in the presence of imprecise information. We rst demonstrate the need to have such a rule-based semantics by showing a real-world application requiring such reasoning. We then deene this semantics. Optimizations and approximations of the semantics are shown so as to make the semantics amenable to very large scale real-world applications. ...
متن کاملClustering in Object Bases
We investigate clustering techniques that are speci cally tailored for object-oriented database systems. Unlike traditional database systems object-oriented data models incorporate the application behavior in the form of type-associated operations. This source of information is exploited for clustering decisions by statically determining the operations' access behavior applying data ow analysis...
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ژورنال
عنوان ژورنال: ACM Transactions on Database Systems
سال: 2001
ISSN: 0362-5915,1557-4644
DOI: 10.1145/502030.502031