661 research outputs found
Surface density of states in the many-neighbor approximation
No full textPT: J; CR: DAVISON SG, 1969, CHEM PHYS LETT, V3, P424 DAVISON SG, 1972, INT J QUANTUM CHEM, V6, P387 DAVISON SG, 1976, INT J QUANTUM CHEM, V10, P867 ECONOMOU EN, 1983, SOLID STATE SCI SER, V7 KALKSTEIN D, 1971, SURF SCI, V26, P85 LAVIS DA, UNPUB LAVIS DA, 1985, J PHYS C SOLID STATE, V18, P1387; NR: 7; TC: 4; J9: J PHYS CHEM; PG: 4; GA: A0336Source type: Electronic(1
NCS: Network and Cache Simulator -- An Introduction
No full textNCS (Network and Cache Simulator) is an HTTP trace-driven discrete event simulator of network and caching activity. It is highly parameterized for maximal compatibility with previous caching and network simulations. In granularity, it resides between the high-level caching-only simulators prominant in much Web caching research, and the detailed simulators of networking protocols and traffic. In an effort to capture estimates of user-perceived latency, it simulates simplistic caching and prefetching functionality at various locations in a network comprising of client browsers, an optional intermediate proxy, and Web servers. Caching at the proxy and clients is optional. Additionally, it simulates many aspects of TCP traffic among these entities on a somewhat idealized network. In this report we motivate the development of NCS and describe its features and capabilities. We additionally provide a number of sample experiments showing the simulator’s utility in a variety of contexts.Technical report DCS-TR-44
Topical Locality in the Web: Experiments and Observations
No full textMost web pages are linked to others with related content. This idea, combined with another that says that text in, and possibly around, HTML anchors describe the pages to which they point, is the foundation for a usable World-Wide Web. In this paper, we examine to what extent these ideas hold by empirically testing whether topical locality mirrors spatial locality of pages on the Web. In particular, we find that the likelihood of linked pages having similar textual content to be high; the similarity of sibling pages increases when the links from the parent are close together; titles, descriptions, and anchor text represent at least part of the target page; and that anchor text may be a useful discriminator among unseen child pages. These results present the foundations necessary for the success of many web systems, including search engines, focused crawlers, linkage analyzers, and intelligent web agents.Technical report DCS-TR-41
ROPE: the Rutgers Online Proxy Evaluator
No full textThe Simultaneous Proxy Evaluation (SPE) architecture provides one way to measure the performance of proxy caches. It includes the novel ability to compare prefetching proxy cache performance, but poses a number of implementation challenges. In this report we describe our prototype implementation of SPE, the Rutgers Online Proxy Evaluator (ROPE). We discuss a number of issues raised during development, describe validation tests, and demonstrate the use of our prototype in two experiments to simultaneously evaluate up to four publicly available proxy cache implementations. We measure bandwidth used and response latencies, but also discover unexpected caching bugs in two of the proxies tested.Technical report DCS-TR-44
Experiments in UNIX command prediction
No full textA good use interface is central to the success of most products. Our research is concerned with improving an interface by making it adaptive - changing over time as it learns more about the user. In this paper, we consider the task of modifying a UNIX shell to learn to predict the next command executed as one sample adaptive user interface. To this end, we have collected command histories (some extensive) from 77 people, and have calculated the predictive accuracy for each of five methods over this dataset. The algorithm with the highest performance produces an average online predictive accuracy of up to 38%.Technical report ml-tr-4
Pushing Politely: Improving Web Responsiveness One Packet at a Time
No full textThe rapid growth of traffic on the World-Wide Web results in heavier loads on networks and servers and in increased latency experienced while retrieving web documents. This paper presents a framework that exploits idle periods to satisfy future HTTP requests speculatively and opportunistically. Our proposal differs from previous schemes in that speculative dissemination always gives precedence to on-demand traffic, uses ranged requests for improved performance, and can be implemented over a connectionless transport. The protocol uses bounded and little server state even as the workload was increased and it is resistant to erroneous estimates of available bandwidth. Substantial latency improvements are reported over pure on-demand strategies.Technical report DCS-TR-41
Learning Hierarchical Task Networks from Traces and Semantically Annotated Tasks
No full textiii iv Acknowledgements I wish to thank the following persons, without whom this work would not have been possible: • My wife Rachel, who lovingly and expertly brandished carrots and sticks to ensure progress over the last year. • My parents Jeffrey and Cynthia who supported me through both my childhood and eleven years of post-secondary education. • My advisor, Héctor Muñoz-Avila, who has been a source of funding, knowl-edge, inspiration, and friendship for the past five years. • My frequent co-author Ugur Kuter, whose ideas strongly influenced Chapters 4 and 5 in particular. • My other committee members, Brian Davison, Jeff Heflin, and Henry Baird, each of whom have been available and helpful throughout my time at Lehigh
Notes on the technical sessions of the Fourth HPCD Workshop
No full textThe fourth HPCD Workshop was held at Rutgers University on July 17 and 18, 1997, which was approximately the midpoint of the fourth year of the four year project. The workshop provided the opportunity to review the project goals, to bring together the people related to the project, summarize the experiences, and identify spinoffs and outgrowths of the HPCD effort. During the technical sessions of the workshop, investigators from each of the project's areas summarized the research that had been done in the project, concentrating on the previous year. This memo briefly outlines each talk and any ensuing discussion.Technical report HPCD-TM-
Notes on the fourth HPCD Workshop
No full textThe fourth HPCD Workshop was held at Rutgers University on July 17 and 18, 1997, which was approximately the midpoint of the fourth year of the four year project. The workshop provided the opportunity to review the project goals, to bring together the people related to the project, summarize the experiences, and identify spinoffs and outgrowths of the HPCD effort. During the technical sessions of the workshop, investigators from each of the project's areas summarized the research that had been done in the project, concentrating on the previous year. This memo briefly outlines each talk and any ensuing discussion.Technical report HPCD-TM-
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