Behavior believability in virtual worlds: agents acting when they need to.

Believability has been a perennial goal for the intelligent virtual agent community. One important aspect of believability largely consists in demonstrating autonomous behavior, consistent with the agent's personality and motivational state, as well as the world conditions. Autonomy, on behalf of the agent, implies the existence of an internal structure and mechanism that allows the agent to have its own needs and interests, based on which the agent will dynamically select and generate goals that will in turn lead to self-determined behavior. Intrinsic motivation allows the agent to function and demonstrate behavior, even when no external stimulus is present, due to the constant change of its internal emotional and physiological state. The concept of motivation has already been investigated by research works on intelligent agents, trying to achieve autonomy. The current work presents an architecture and model to represent and manage internal driving factors in intelligent virtual agents, using the concept of motivations. Based on Maslow and Alderfer's bio-psychological needs theories, we present a motivational approach to represent human needs and produce emergent behavior through motivation synthesis. Particular attention is given to basic, physiological level needs, which are the basis of behavior and can produce tendency to action even when there is no other interaction with the environment.

Web and mobile secure access to a Web based medical system.

This paper describes the implementation of the Web Based Pneumonia Chemotherapeutics (WPCh) a Web-based expert system for chemotherapeutic assistantship for nosocomial and community-acquired pneumonia based on different types of data. WPCh can be accessed through World Wide Web or a mobile phone using the relevant script languages. The core of the paper focuses on the usage of security of data and the procedures used to accomplish this task. After the log in of the physician, he can take advantage of the various modules of the expert system in order to view chemotherapeutics and save the data that he prefers. The whole procedure can be followed through the interfaces of wap technology.