Enforcing security requires the application of an access control model. The access control models used today have limitations that become evident when applied in collaborative environments, such as medical environments. To overcome these problems, a system has been developed in order to introduce dynamic access security. The system at hand combines effectively (C-TMAC) Team-based access control...

In many knowledge-based systems the used knowledge is distributed among several knowledge sources. Knowledge maintenance of such systems has several challenges to be met. This paper gives a short overview of a maintenance approach using so-called Case Factories to maintain knowledge sources and considering the dependencies between these sources. Furthermore we present a concept how our maintena...

Air Products and Chemicals, Inc., to support compliance with regulatory requirements for communicating health and safety information in the shipping and handling of chemical products. This article concentrates on one of the knowledge bases in this system: the case-based reasoner. The casebased reasoner addresses the issue of how proper communication of public health and safety information can b...

There is considerable enthusiasm about Case-Based Reasoning as a means of developing knowledge-based systems. There are two broad reasons for this enthusiasm. First, it is evident that much of human expert competence is experience based and it makes sense to adopt a reuse-based methodology for developing knowledge based systems. The other reason is the expectation that using Case-Based Reasonin...

Since the invention of the sound spectrograph in 1946 by Koenig, Dunn and Lacey, spectrograms have been widely used for speech research. Over the last decade there has been revived interest in the application of spectrogram reading toward continuous speech recognition. Spectrogram reading involves interpreting the acoustic patterns in the image to determine the spoken utterance. One must select...

Our goal is to build knowledge acquisition tools that support users in modifying knowledge-based systems. These modiications may require several individual changes to various components of the knowledge base, which need to be carefully coordinated to prevent users from leaving the knowledge-based system in an unusable state. This paper describes an approach to building knowledge acquisition too...

Taaable is a Case-Based Reasoning (cbr) system that uses a recipe book as a case base to answer cooking queries. Taaable participates in the Computer Cooking Contest since 2008. Its success is due, in particular, to a smart combination of various methods and techniques from knowledge-based systems: cbr, knowledge representation, knowledge acquisition and discovery, knowledge management, and nat...

Constraints are used to manage the integrity of knowledge. Knowledge-based systems applications are frequently constructed as a knowledge base, or rule base, component coupled with a relational database component. The most expensive of these two components o build and maintain is typically the knowledge base. Constraints, which play a key role in database management, are seldom mentioned in con...

Constructing a planner for a particular application is a diicult job, for which little concrete support is currently available. The literature on planning is overwhelming and there is no clear synthesis of the various planning methods which could be used by knowledge engineers. In this paper, we show how a general, knowledge-level framework for conceptually specifying knowledge-based systems, c...

Modern intelligent applications based on semantic technologies constitute an interesting class of Knowledge-Based Systems. The paper gives an overview of the methods and tools used in semantic systems and presents the research concerning adaptation of well-founded solutions for Rule-Based Systems to the semantic systems conditions. Theoretical solutions as well as practical implementations are ...