By Georg Gottlob, Nicola Leone, Francesco Scarcello (auth.), Trevor J.M. Bench-Capon, Giovanni Soda, A Min Tjoa (eds.)
The Database and specialist structures purposes (DEXA) meetings compile researchers and practitioners from around the globe to switch rules, studies and reviews in a pleasant and stimulating surroundings. The papers are immediately a checklist of what has been accomplished and the 1st steps in the direction of shaping the way forward for info structures. DEXA covers a extensive box, and all elements of database, wisdom base and comparable applied sciences and their functions are represented. once more there have been plenty of submissions: 241 papers have been submitted and of those the programme committee chosen 103 to be offered. DEXA’99 came about in Florence and used to be the 10th convention within the sequence, following occasions in Vienna, Berlin, Valencia, Prague, Athens, London, Zurich, Toulouse and Vienna. the last decade has visible many advancements within the parts coated by means of DEXA, advancements during which DEXA has performed its half. i need to precise due to the entire associations that have actively supported and made attainable this convention, specifically: • collage of Florence, Italy • IDG CNR, Italy • FAW – college of Linz, Austria • Austrian machine Society • DEXA organization furthermore, we needs to thank all of the those that have contributed their effort and time to make the convention attainable. distinct thank you visit Maria Schweikert (Technical collage of Vienna), M. Neubauer and G. Wagner (FAW, college of Linz). We also needs to thank the entire contributors of the programme committee, whose cautious studies are vital to the standard of the conference.
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Additional info for Database and Expert Systems Applications: 10th International Conference, DEXA’99 Florence, Italy, August 30 – September 3, 1999 Proceedings
The choice of crossing-over point is significant. It is based on the uniform crossing-over of the genetic algorithm . It amounts to granting a weight relating to each parent for the transmission of genes to one of the children. This weight is calculated according to the Av. of each scheme (see example). After this, a random number is generated, then compared with the weight. If it is lower, the scheme 1 gene is transmitted to child 1 and the scheme 2 gene is transmitted to child 2. This operation of random bonding is repeated until all the genes have been reviewed.
Soda, and A M. ): DEXA '99, LNCS 1677, pp. 26-35, 1999. Springer-Verlag Berlin Heidelberg 1999 Dynamic Relationships in Object Oriented Databases: A Uniform Approach 27 2 Relationships: Objects and Meta-objects Relationships in our approach are based on the observation that three types of entities exist within an object database. These are: objects, meta-objects and meta-classes. Entities of each type reside within a specific virtual space within the database. Objects reside in the object space and are instances of classes.
The scheme is a simple and powerful means to model groups of individuals. We consider two kinds of schemes: − Permanent scheme: with each specified class is associated a permanent scheme. It also contains three parts: fundamental, inherited and specific genotypes parts. − Temporary scheme: it is a selection unit of one or a group of entities (instances or classes). It is especially useful during an instance evolutionary process and is used like a filter allowing selection of adapted entities. 2.