In an earlier study a Semantic Content Based Image Retrieval system was developed. The system requires a Visual Object Process Diagram VOPD to be created for each image in the database and for the query. This is a major drawback since it requires the user and database manager to be acquainted with the rules and structures of the VOPD. This is not trivial and in fact troublesome to the naive use...

Agent design patterns represent solutions to the specific problem of developing multi-agent based applications that have evolved over time. They leverage the reuse level to the design phase by providing a common vocabulary of design, means of understanding designs and proven building blocks from which more complex applications are built. Much of the research work on agent design patterns has pr...

Among the benefits of agent-based modeling is parallel development and implementation of components. Integrating large numbers of agents developed by many is, however, a significant challenge. Further, architectural changes can require significant redesign. We have developed CDM-S, the Constructionist Design Methodology for Simulation, an agent-oriented methodology for developing, implementing ...

As system complexity has increased, so has interest in reusing software components in early development phases. While most current modeling methods support design of generic parameterized frameworks or patterns and weaving them into specific models, they do not support open reuse, i.e., the ability to develop partially specified components and refine them in the target application. We introduce...

Recently Perlmutter et al. (1999) suggested a positive value of Einstein’s cosmological constant Λ on the basis of luminosity distances from type-Ia supernovae (the “SN-method”). However, Λ world models had earlier been proposed by Hoell & Priester (1991) and Liebscher et al. (1992a,b) on the basis of quasar absorption-line data (the “Q-method”). Employing more general repulsive fluids (“dark e...

Meta modeling is an effective approach to implement interoperability among many distributed and heterogeneous information sources. A MMF (Meta Model Framework) is a set of Meta objects and Meta modeling constructs to be used in the development a metamodel in the actual implementation of a registry. This paper proposes a common repository model based on MMF to ensure interoperability among heter...

As public utilities continue to evolve from regulated monopoly structures to open markets that promote free and fair competition, new players, new rules and new behaviors will continue to emerge, and given the uncertainties associated with this process, the need for suitable and a well-representative model increases. In this paper we present an Agent-Based Model (ABM) developed to capture some ...