Conceptual data models, as means of communication, must have semantic quality. Such quality relies on the model’s completeness and validity in relation to the concepts it is supposed to represent. Since the modeler acquires such concepts mostly from texts created in a natural language, a semantic-oriented linguistic approach should be adopted for building unambiguous conceptualizations. Also, t...

the gravimetric method is one of the most effective ways for the detection of subsurface structures such as tunnels, faulting, mineral deposits with the required density difference, especially in areas with rough topography and tectonized formations. it is possible to provide a more suitable model for better interpretation of the gravity anomaly. inverse modeling of gravity data is the most eff...

The Unified Modeling Language (UML) is becoming widely used for software and database modeling, and has been accepted by the Object Management Group as a standard language for object-oriented analysis and design. For data modeling purposes, UML includes class diagrams, that may be annotated with expressions in a textual constraint language. Although facilitating the transition to object-oriente...

Groupware is explicitly designed to support the cooperation among group members. The implementation of cooperation-aware groupware is supported by several object-oriented toolkits and frameworks, but there is no uni®ed way to model applications built on top of these. We have proposed UML-G as an extensible UML pro®le for modeling groupware and are in the process of turning it into a community e...

Manufacturers need to evaluate the reliability of their products in order to increase the customer satisfaction. Proper analysis of reliability also requires an effective study of the failure process of a product, especially its failure time. So, the Failure Process Modeling (FPM) plays a key role in the reliability analysis of the system that has been less focused on. This paper introduces a f...