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Some real world domains require planners to cope with uncertainty and time pressure. This paper describes a model of reaction plans that is based on (1) an action formalism allowing for incomplete state descriptions and context-dependent action with multiple eeect-alternatives, and (2) state descriptions in probabilistic logic. This model is proposed as a(More)
In [Z. Fuzzy timed Petri net — definitions, properties and applications, Math. Comput. Modelling (2005) (in press)], we posed two fuzzy timed Petri Net models. Based on the mark changing rate, they can be classified either as a discrete Fuzzy Timed Petri Net model (discrete-FTPN), or as a continuous Fuzzy Timed Petri Net model (continuous-FTPN). In this(More)
Most existing methods of document clustering are based on the classical vector-space model, which represents each document by a fixed-size vector of key terms or key phrases. I n large and diverse document collections such as the World Wide Web, this approach suffers from a tremendous computational overload. since the constant size of the term vector equals(More)
Terrorist groups use the Web as their infrastructure for various purposes. One example is the forming of new local cells that may later become active and perform acts of terror. The Advanced Terrorist Detection System (ATDS), is aimed at tracking down online access to abnormal content, which may include terrorist-generated sites, by analyzing the content of(More)