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PREOP is a medical expert system which is being developed on the expert-system shell NEXPERT. PREOP determines the risk of cardiac complications for a patient about to undergo noncardiac surgery, and recommends a programme of medication intake for the patient. PREOP's final database and hardware requirements are uncertain, and so are its final functionalities. These uncertainties necessitate a database interface which facilitates overall system flexibility, maintainability, modularity, and integration with existing information systems. These objectives are best achieved by a loosely coupled database interface which is not under NEXPERT's control. PREOP-DIS is a loosely coupled database interface system for PREOP. This project uses the relational model to design PREOP' s database and implements the database on the relational DBMS SYBASE. The project implements PREOP-DIS as a C program that communicates data between PREOP and the SYBASE database by dynamically making calls to NEXPERT and to the SYBASE dataserver. / Thesis / Master of Science (MS)

The focus of this thesis is a proprietary database interface for management tables in memory. At the beginning, there is given a short introduction to the databases. Then the concept of in-memory database systems is presented. Also the main advantages and disadvantages of this solution are discussed. The theoretical introduction is ended by brief overview of existing systems. After that the basic information about energetic management system RIS are presented together with system's in-memory database interface. Further the work aims at the specification and design of required modifications and extensions of the interface. Then the implementation details and tests results are presented. In conclusion the results are summarized and future development is discussed.