Date of Award

6-1999

Document Type

Thesis

Degree Name

Master of Science

Department

Department of Electrical and Computer Engineering

First Advisor

Thomas C. Hartrum, PhD

Abstract

The use of many different simulation systems by the United States Department of Defense has resulted in many different scenario data representations contained in heterogeneous databases. These heterogeneous databases all represent the same data concept, but have different semantics due to intrinsic variations among the data models. In this research, I describe a unified scenario database to allow interoperability and reuse of the scenario data components while avoiding the problems of data redundancy. Using the object oriented approach, the data and schema of the scenario databases, represented in an object oriented model, are integrated into a global database also represented in an object oriented model. The global database schema is extended to allow semantic interoperability of database components by explicitly associating the semantics of the schema elements of the database components with the global metadata. I create the Integration Dictionary to represent the semantic interoperability and to store the translation mappings between each database component and the global database. The Integration Dictionary also provides support for object oriented views generation. Next, I describe a methodology to integrate databases using the Integration Dictionary. My methodology is based on an analysis of the semantics of conceptual schema elements and on the identification of related elements in the global schema. My methodology defines the resolution for schema conflicts, and associates these conflict resolutions with data changes in the Integration Dictionary. Selected parts of the Extended Air Defense Simulation (EADSIM) and Suppressor scenario databases are integrated into the global database to validate my methodology. I use the Object Store database to implement the global database. This methodology can be applied to other systems that require database integration.

AFIT Designator

AFIT-GCS-ENG-99J-03

DTIC Accession Number

ADA364951

Comments

The author's Vita page is omitted.

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