One of the most highly touted virtues of knowledge-based expert systems is their abil i ty to construct explanations of deduced lines of reasoning. However, there is a basic difficulty in generating explanations in expert systems that reason under uncertainty using numeric measures. In particular, systems based upon evidential reasoning using the theory of belief functions have lacked any facil...

The explosive interest in Knowledge Management and systems to support this as an organizational endeavour, require closer scrutiny than might be normal from the I/S function. Empirical research indicates that knowledge based systems might be better considered as ‘peoplecentric’, rather than from a technology platform perspective.

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...

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...

imagine you have traveled to an unfamiliar city. before you start your daily tour around the city, you need to know a good route. in network theory (nt), this is the traveling salesman problem (tsp). a dynamic programming algorithm is often used for solving this problem. however, when the road network of the city is very complicated and dense, which is usually the case, it will take too long fo...

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 ...

This document presents some researches centered on the issue of the design of a case-based reasoning (CBR) system, particularly of the steps of retrieval of a source case similar to the target problem and of adaptation of this case to solve this problem. First, an approach of retrieval based on the hierarchical organization of cases is described. It is composed of three procedures, the strong, ...

The literature on validation and verification of knowledge-based systems contains a catalogue of anomalies for knowledge-based systems, such as redundant, contradictory or deficient knowledge. Detecting such anomalies is a method for verifying knowledge-based systems. Unfortunately, the traditional formulation of the anomalies in the literature is very specific to a rule-based knowledge represe...