IPAD: Integrated Programs for Aerospace-vehicle Design

Early work was performed to apply data base technology in support of the management of engineering data in the design and manufacturing environments. The principal objective of the IPAD project is to develop a computer software system for use in the design of aerospace vehicles. Two prototype systems are created for this purpose. Relational Information Manager (RIM) is a successful commercial product. The IPAD Information Processor (IPIP), a much more sophisticated system, is still under development

View mappings for query languages

The problems of current use of query languages are looked at. One chief drawback is the undesirable requirement for end user familiarity with and knowledge of the underlying database structures, in order to retrieve data effectively. The approach adopted towards resolving this is by means of high-level view support, using unit view structures called perceived records. A prime concern of this thesis then, is the study of perceived record mappings from the database. A set of criteria for categorising and analysing the features of database mappings for end-user views is first developed. In addition, a classification of data structure transformations and data item transformations is also presented. The framework is general and is independent of a specific data model or database management system. Its usefulness is demonstrated by its application to the analysis of view transformations from recursive database structures to high-level, unit view structures. In addition, it serves as a basis for evaluating and comparing the mapping facilities in existing systems. Possible ways of specifying a suitable data model for the perceived record view concept are described. Following on, two general mapping techniques are discussed. This leads to a proposal for a mapping mechanism that supports the flexible derivation of complex perceived record views that can differ considerably from the source structures. The mechanism uses an intermediary canonical transform model. Description of how the transform model mechansim can be used in practical systems to derive perceived record views, is also presented. The feasibility of the ideas proposed are tested out by implementing an interactive software system for defining perceived record views. For this, a mapping definition language for perceived record derivation is first designed. The control system sets up the structures of the mapping definition language and prompts the End-User-Administrator to define and specify the mappings for a perceived record. Appraisals of both the proposed mapping mechanism and implementation are discussed. Examples of use of the interface system are included. The limitations of the implementation are pinpointed with suggestions for further improvements. Practical applications of the work and evaluation of the approach in the light of other existing approaches, are also discussed

The instrumentation of the multimodel and multilingual user interface

The traditional approach to database-management-system (DBMS) designs focuses upon the implementation of a single data model and its corresponding data language in order to support applications for a given database task. Each of these monomodel and monolingual database systems represents a homogeneous database system, since only one data language model can be supported on a single database system. The application diversity forces many organizations to operate several different homogenous database systems to support its operations. A different approach to database-system design is the development of a DBMS which supports multiple data models and their data languages. This approach is the focus of the multimodel and multilingual database system (MM&MLDS) as implemented on the Multibackend Database Supercomputer (MDBS). With the proliferation of new data model-languages in the database technology, the objective of MM&MFDS is to incorporate these new data model-languages onto the same MDBS. The goal of this thesis is to develop procedures methods and tools for the incorporation of new data model-languages onto MM&MLDS as new interfaces. three areas of research are critical to achieving this goal. First, the development of a MDBS user's manual for familiarization as well as instruction for system users. Second, the specification of generic processing algorithms used as a foundation for each module of the new model-language interface. Third, our software methodology considerations for new data model-language interface implementation.http://archive.org/details/instrumentationo00bourCaptain, United States Marine CorpsApproved for public release; distribution is unlimited

Cross model access in the multi-lingual, multi-model database management system.

Relational, hierarchical, network, functional, and object oriented databases support its corresponding query language, SQL, DL/I, CODASYL-DML, DAPLEX, and OO-DML, respectively. However, each database type may be accessed only by its own language. The goal of M2DBMS is to provide a heterogeneous environment in which any supported database is accessible by any supported query language. This is known as cross model access capability. In this thesis, relational to object oriented database cross model access is successfully implemented for a test database. Data from the object oriented database EWIROODB is accessed and retrieved, using an SQL query from the relational database EWIROODB. One problem is that the two interfaces (object oriented and relational) create catalog files with different formation, which makes the cross model access impossible, initially. In this thesis the relational created catalog file is used, and the cross model access capability is achieved. The object oriented catalog file must be identical with the relational one. Therefore, work yet to be done is to write a program that automatically reformats the object oriented catalog file into an equivalent relational catalog filehttp://archive.org/details/crossmodelaccess00anasLt, Hellenic NavyApproved for public release; distribution is unlimited

Database system architecture supporting coexisting query languages and data models

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