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All analytical and simulation research on ad~hoc wireless networks must necessarily model radio propagation using simplifying assumptions. We provide a comprehensive review of six assumptions that are still part of many ad hoc network simulation studies, despite increasing awareness of the need to represent more realistic features, including hills,(More)
Mobile-agent systems must address three security issues: protecting an individual machine, protecting a group of machines, and protecting an agent. In this chapter, we discuss these three issues in the context of D'Agents, a mobile-agent system whose agents can be written in Tcl, Java and Scheme. (D'Agents was formerly known as Agent Tcl.) First we discuss(More)
D'Agents is a general-purpose mobile-agent system that has been used in several information-retrieval applications. In this paper, we first examine one such application, operational support for military field personnel, where D'Agents greatly simplifies the task of providing efficient, application-specific access to remote information resources. After(More)
One of the tools that will be essential for future electronic publishing is a powerful image retrieval system. The author should be able to search an image database for images that convey the desired information or mood; a reader should be able to search a corpus of published work for images that are relevant to his or her needs. Most commercial image(More)
Agent Tcl is a transportable-agent system that is under development at Dartmouth College. A transportable agent is a named program that can migrate from machine to machine in a heterogeneous network. Such programs are a p o werful tool for implementing information agents since the electronic resources in a user's information space are often distributed(More)
Use of the Internet has exploded in recent years with the appearance of the WorldWide Web. In this paper , we show how current technological trends may lead to a system based substantially on mobile code, and in many cases, mobile agents. We discuss several technical and non-technical hurdles along the path to that eventuality. It seems likely that, within(More)