298,975 research outputs found
Translating Relational Conceptual Schema to Object-Oriented Schema
A multidatabase is a confederation of preexisting distributed, heterogeneous, and
autonomous database system. The integration process is essential in the effort of
forming a distributed, heterogeneous database system. This process generally
consists of two main phases, which are conceptual schema translation phase and
followed by the integration phase. In our research, we have proposed an alternative
translation approach to convert relational database schema to object--oriented
database schema.
The translation approach consists of a set of translation rules, which are based on
inclusion dependencies, key attributes and types of attributes. A database schema
translation tool prototype, called RETOO (Relational-to-Object-Oriented) is then
developed based on the proposed translation approach. RETOO receives a relational
database schema as input data and generate an object-oriented database schema as
the output data.RETOO operates semi-automatically, especially in the process of identifying
operations for each class. This is because relational data model does not provide the
behavioural information of every entity.
The translation approach and RETOO database translation tool prototype are not
only able to maintain the semantics of the relational database schema, but also
enhance the semantics of the translated object-oriented schema via object-oriented
data modelling concepts
Quality-aware model-driven service engineering
Service engineering and service-oriented architecture as an integration and platform technology is a recent approach to software systems integration. Quality aspects
ranging from interoperability to maintainability to performance are of central importance for the integration of heterogeneous, distributed service-based systems. Architecture models can substantially influence quality attributes of the implemented software systems. Besides the benefits of explicit architectures on maintainability and reuse, architectural constraints such as styles, reference architectures and architectural patterns can influence observable software properties such as performance. Empirical performance evaluation is a process of measuring and evaluating the performance of implemented software. We present an approach for addressing the quality of services and service-based systems at the model-level in the context of model-driven service engineering. The focus on architecture-level models is a consequence of the black-box
character of services
Internet enabled modelling of extended manufacturing enterprises using the process based techniques
The paper presents the preliminary results of an ongoing research project on Internet enabled process-based modelling of extended manufacturing enterprises. It is proposed to apply the Open System Architecture for CIM (CIMOSA) modelling framework alongside with object-oriented Petri Net models of enterprise processes and object-oriented techniques for extended enterprises modelling. The main features of the proposed approach are described and some components discussed. Elementary examples of object-oriented Petri Net implementation and real-time visualisation are presented
Performance prediction tools for low impact building design
IT systems are emerging that may be used to support decisions relating to the design of a built enviroment that has low impact in terms of energy use and environmental emissions. This paper summarises this prospect in relation to four complementary application areas: digital cities, rational planning, virtual design and Internet energy services
The EnTrak system : supporting energy action planning via the Internet
Recent energy policy is designed to foster better energy efficiency and assist with the deployment of clean energy systems, especially those derived from renewable energy sources. To attain the envisaged targets will require action at all levels and effective collaboration between disparate groups (e.g. policy makers, developers, local authorities, energy managers, building designers, consumers etc) impacting on energy and environment. To support such actions and collaborations, an Internet-enabled energy information system called 'EnTrak' was developed. The aim was to provide decision-makers with information on energy demands, supplies and impacts by sector, time, fuel type and so on, in support of energy action plan formulation and enactment. This paper describes the system structure and capabilities of the EnTrak system
Model-driven performance evaluation for service engineering
Service engineering and service-oriented architecture as an
integration and platform technology is a recent approach to software systems integration. Software quality aspects such as performance are of central importance for the integration of heterogeneous, distributed service-based systems. Empirical performance evaluation is a process of
measuring and calculating performance metrics of the implemented software. We present an approach for the empirical, model-based performance evaluation of services and service compositions in the context of model-driven service engineering. Temporal databases theory is utilised
for the empirical performance evaluation of model-driven developed service systems
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