Towards a modular, object-relational schema design

A modular or even component-based design is state-of-the-art in application development. But both object-relational database management systems and the object-relational standard SQL:1999 lack proper abilities supporting a modular schema design – the prerequisite for a component-based schema design. Nevertheless, the high effort required for an object-relational schema design strictly demands for a modular schema design. This paper describes the challenges of such a schema design and gives a vision of how a modular, object-relational schema design should look like

Modellgetriebene Entwicklung inhaltsbasierter Bildretrieval-Systeme auf der Basis von objektrelationalen Datenbank-Management-Systeme

In this thesis, the model-driven software development paradigm is employed in order to support the development of Content-based Image Retrieval Systems (CBIRS) for different application domains. Modeling techniques, based on an adaptable conceptual framework model, are proposed for deriving the components of a concrete CBIRS. Transformation techniques are defined to automatically implement the derived application specific models in an object-relational database management system. A set of criteria assuring the quality of the transformation are derived from the theory for preserving information capacity applied in database design.In dieser Dissertation wird das Paradigma des modellgetriebenen Softwareentwurfs für die Erstellung von inhaltsbasierten Bildretrieval-Systemen verwendet. Ein adaptierbares Frameworkmodell wird für die Ableitung des Modells eines konkreten Bildretrieval-Systems eingesetzt. Transformationstechniken für die automatische Generierung von Implementierungen in Objektorientierten Datenbank-Management-Systemen aus dem konzeptuellen Modell werden erarbeitet. Die aus der Theorie des Datenbankentwurfs bekannten Anforderungen zur Kapazitätserhaltung der Transformation werden verwendet, um Kriterien für die erforderliche Qualität der Transformation zu definieren

Database development and intranet based image included database management system for ballistic firearm identification system

The process of imaging, collecting and searching a cartridge case to identifying its suspected firearm is a time consuming procedure. Within this study, a cartridge case identification database management system in an Intranet environment is designed and implemented, thus enabling firearm examiners from different forensic laboratories to engage firearm identification without the constraints of time and location. Specifically, the study investigates appropriate database management system for image involved and Intranet secured ballistics firearm identification database. The results demonstrated that a computerized firearm identification system could be implemented in Intranet with a secure, scalable, performable Intranet database management system

Extensibility in ORDBMS databases : an exploration of the data cartridge mechanism in Oracle9i

To support current and emerging database applications, Object-Relational Database Management Systems (ORDBMS) provide mechanisms to extend the data storage capabilities and the functionality of the database with application-specific types and methods. Using these mechanisms, the database may contain user-defined data types, large objects (LOBs), external procedures, extensible indexing, query optimisation techniques and other features that are treated in the same way as built-in database features . The many extensibility options provided by the ORDBMS, however, raise several implementation challenges that are not always obvious. This thesis examines a few of the key challenges that arise when extending Oracle database with new functionality. To realise the potential of extensibility in Oracle, the thesis used the problem area of image retrieval as the main test domain. Current research efforts in image retrieval are lagging behind the required retrieval, but are continuously improving. As better retrieval techniques become available, it is important that they are integrated into the available database systems to facilitate improved retrieval. The thesis also reports on the practical experiences gained from integrating an extensible indexing scenario. Sample scenarios are integrated in Oracle9i database using the data cartridge mechanism, which allows Oracle database functionality to be extended with new functional components. The integration demonstrates how additional functionality may be effectively applied to both general and specialised domains in the database. It also reveals alternative design options that allow data cartridge developers, most of who are not database server experts, to extend the database. The thesis is concluded with some of the key observations and options that designers must consider when extending the database with new functionality. The main challenges for developers are the learning curve required to understand the data cartridge framework and the ability to adapt already developed code within the constraints of the data cartridge using the provided extensibility APls. Maximum reusability relies on making good choices for the basic functions, out of which specialised functions can be built.KMBT_363Adobe Acrobat 9.54 Paper Capture Plug-i

Tesla - ein virtuelles Labor für experimentelle Computer- und Korpuslinguistik

Linguistisch motivierte Komponentensysteme bieten die Möglichkeit, Prozessketten zur maschinellen Annotation natürlichsprachlicher Daten zu definieren und auszuführen. Bisherige Ansätze unterliegen dabei verschiedenen Einschränkungen: So werden i.d.R. datenorientierte Austauschformate verwendet, die eine Abbildung generierter Daten auf proprietäre Metaformate erfordern, wodurch die Flexibilität bei der Implementation neuer Komponenten reduziert wird. Zudem wird der Reproduzierbarkeit von Ergebnissen nur eine niedrige Priorität eingeräumt, was die Nachvollziehbarkeit und Adaption neuer Verfahren erschwert. In dieser Arbeit wird mit Tesla (Text Engineering Software Laboratory) ein alternatives Komponentensystem vorgestellt, das die skizzierten Kritikpunkte ebenso wie weitere Nachteile und Einschränkungen derartiger Systeme vermeidet. Anhand eines Verfahrens zur automatischen Extraktion syntaktischer Strukturen, das auf die distributionelle Analyse nach Harris zurückgeführt werden kann, werden zunächst die Anforderungen, denen ein computerlinguistisches Komponentensystem genügen muss, konkretisiert und diskutiert. Im Anschluss daran werden verschiedene Frameworks hinsichtlich dieser Anforderungen evaluiert, um schließlich Konzept, Design und Implementation von Tesla vorzustellen und dadurch zu verdeutlichen, dass das beschriebene Strukturierungsverfahren in Form verschiedener experimenteller Versuchsaufbauten analysiert, erweitert und auf neue Untersuchungsgegenstände angewendet wird

Computer science: the hardware software and heart of IT

1st edition, 201