The present invention provides a method and a device for providing superior differential GPS positioning data. The system includes a group of GPS receiving ground stations covering a wide area of the Earth’s surface. Unlike other differential GPS systems wherein the known position of each ground station is used to geometrically compute an ephemeris for each GPS satellite, the present system uti...

A feedback vertex set of an undirected graph is a subset of vertices that intersects with the vertex set of each cycle in the graph. Given an undirected graph G with n vertices and weights on its vertices, polynomial-time algorithms are provided for approximating the problem of finding a feedback vertex set of G with smallest weight. When the weights of all vertices in G are equal, the performa...

We use our implementation of a distributed interface for digital libraries to explain several design alternatives for distributed Web applications. Our focus is on an analysis of how functionality should be distributed between clients and servers. Based on our prototype and related performance results, we conclude that it is useful to move some user interface related functionality from server t...

Area-wide pest management is one of several major plans or strategies for coping with pest problems. Management of localized populations is the conventional or most widely used strategy, wherein individual producers, other operators and households practice independent pest control. However, since individual producers or households are not capable of adequately meeting the challenge of certain v...

This paper describes the design and implementation of S W O R D , a scalable resource discov ery serv ice for w ide-area distributed sy stems. S W O R D locates a set of machines matching user-specifi ed constraints on both static and dy namic node characteristics, including both single-node and inter-node characteristics. W e ex plore a range of sy stem architectures to determine the appropria...

This paper explores the architecture, implementation and performance of a wide and local area database replication system. The architecture provides peer replication, supporting diverse application semantics, based on a group communication paradigm. Network partitions and merges, computer crashes and recoveries, and message omissions are all handled. Using a generic replication engine and the S...

Title of dissertation: WIDE-AREA MOBILE CONTENT DELIVERY Bo Han, Doctor of Philosophy, 2012 Dissertation directed by: Professor Aravind Srinivasan Department of Computer Science and Professor Bobby Bhattacharjee Department of Computer Science Hybrid mobile content delivery systems improve performance of wide-area networks by combining both wide-area and local-area communications. In hybrid cont...

Peak electricity demands from huge number of households in a mega-city would cause contention, leading to potential blackout. This paper proposes bi-directional collaboration via a Smart Energy Monitor System (SEMS) between consumers and energy suppliers, exchanging real-time energy usage data with smart meters over the Internet and mobile devices for well-informed decisions and even prediction...

Problems associated with telemetry blackout caused by the plasma sheath surrounding a hypersonic vehicle are addressed. In particular, the critical nature of overcoming this limitation for test and evaluation purposes is detailed. Since the telemetry blackout causes great concern for atmospheric cruise vehicles, ballistic missiles, and reentry vehicles, there have been many proposed approaches ...