SZTAKI Közlemények 36. (1987)
CONTENTS Page G. ANGELOVA: Cyclic and acyclic relational database schemes ................................ 5 MIGUEL FONFRIA ATAN - MARIA ELENA BRETANA: About a methodology to select a DBMS ........... 31 J. BISKUP - U. RÄSCH: The equivalence problem for relational database schemes ................... 49 PHAN DANG CAU: On predictive deconvolution of long-run stationary time series ............... 79 A. HEPPES: On the density of translates of domain 93 P. KERÉKFY, M. RUDA, Gy. ALEXICS, A. GÁL, К. KOVÁCS, T. LENGYEL, F. RÁKÓCZI: LAN based integrated hospital information system ..................... 99 PHAM THE QUE: The relation between antikeys and m-minimal covers in the relation schemes ....... 105 B. SZAFRANSKI: Mathematical models of data security processes in centralized and distributed data base systems .............................. 123 N. TRONG: On random dependencies of data in relational data bases ....................................... 145 B. UHRIN: A reduction theorem for the measures of sum-sets in Rn .................................... 173 LIE TIEN VUONG - HO THUAN: An extended relational database by application of fuzzy set theory and linguistic variable ........................... 197