Tomasz Pilka

Adam Mickiewicz University | UAM · Laboratory of Database

In this contribution the concept how to solve the problem of comparability in the interval-valued fuzzy setting and its application in medical diagnosis is presented. Especially, we consider comparability of interval-valued fuzzy sets cardinality, where order of its elements is most important. We propose an algorithm for comparing interval-valued f...

Normalization as a way of producing good database designs is a well understood topic for relational data. We discuss the problem of eliminating redundancies and preserving data dependencies in XML data when an XML schema is normalized. Normalization is one of the main tasks in relational database design, where 3NF or BCNF is to be reached. However,...

In this paper we discuss the problem of redundancies and data dependencies in XML data while an XML schema is to be normalized. Normalization is one of the main tasks in relational database design, where 3NF or BCNF, is to be reached. However, neither of them is ideal: 3NF preserves dependencies but may not always eliminate redundancies, BCNF on th...

Streszczenie: W pracy omawiamy problemy semantycznej inte-gracji danych w środowisku P2P. W tym podejściu każdy z partnerów (ang. peer) dysponuje własnym schematem danych oraz mapowaniami (odwzorowaniami) między swoim schematem a schematami wybranych partnerów. Celem integracji jest udzielenie odpowiedzi na zapytanie kierowane do dowolnego partnera...