Kenneth M. Sochats

Visualization of a document collection: the vibe system

Abstract The idea of using visualization for document retrieval is introduced through a new paradigm for query response handling. The paradigm is based on parallel queries or points of interest . Each point of interest is defined by a number of key terms and a display position. Documents, represented by icons, are positioned in the display based on the frequency count of word matches in the document to key terms in the points of interest. This visualization method has been implemented through a visualization system called VIBE.

System implementation issues of dynamic discrete disaster decision simulation system (D 4 S 2 ): phase I

Simulation has many advantages in modeling complex systems to facilitate decision making. In this research, an integrated computer system will be developed which incorporates an agent-based discrete event simulator, a geographic information system, a rule base, and interactive databases in addition to interfaces and other supporting components. The modules will seamlessly communicate with each other by exchanging a progression of data, and making a series of deductive decisions through embedded algorithms. This integrated system will be applied to disaster management planning and training and is designated Dynamic Discrete Disaster Decision Simulation System (D4S2). Here we address Phase I system implementation issues of D4S2 which is under development.

Market analysis using regulatory reports

The reports that common carriers must file before the Federal Communications Commission (FCC) provide information that allows the FCC to regulate the carriers and create regulatory policy. In an era where increasing competition among telecommunications providers is viewed as desirable, these same regulatory reports can provide strategic information (eg an assessment of market size for specific telecommunication services) to potential competitors. This use of these reports is demonstrated for the Pittsburgh, PA, metropolitan area. The policy implications of this are discussed.

A hybrid modelling framework to simulate disaster response decisions

Computer simulations are designed to imitate detailed system operations. They are utilised to evaluate system performance, predict future behaviour, or compare various policy alternatives. Two main streams exist in current simulation research and practise: discrete event simulation (DES) and agent-based simulation (ABS). This paper describes a unique simulation modelling scheme to combine DES and ABS on one integrated platform in order to take advantages of and eliminate the disadvantages of both methods. The hybrid simulation system was designed and developed to study various disaster response problems. Its successful modelling of a major US city proves the capability of the hybrid method for constructing efficient, flexible large-scale simulations.