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E-commerce and intranet search systems require newly arriving content to be indexed and made available for search within minutes or hours of arrival. Applications such as file system and email search demand even faster turnaround from search systems, requiring new content to become available for search almost instantaneously. However, incrementally updating(More)
Two quadtree variants eeective in modeling 2 1 2-D surfaces are presented. The restricted quadtree can handle regularly sampled data. For irregular data, embedding a TIN inside a PMR quadtree is suggested. Together, these schemes facilitate the handling of most types of input within a single framework. Algorithms for the construction of both data structures(More)
The Java Virtual Machine (Jvm) needs, for the purpose of garbage collection (GC), to determine the data type stored in every memory location. Jvms that can do this reliably are said to be type-accurate (TA). Full type-accuracy usually exacts a price in performance due to the need to scan stacks and registers accurately. The mostly accurate approach(More)
We describe a system for extracting mentions of terms such as company and product names, in a large and noisy corpus of documents, such as the World Wide Web. Since natural language terms are highly ambiguous, a significant challenge in this task is disambiguating which occurrences of each term are truly related to the right meaning, and which are not. We(More)
A parameter adaptive control stmcture for linear multivariable systems,'' IEEE Trans. Abstract-Global convergence of a number of discrete-time adaptive control algorithms with persistently exciting inputs has been established in the literature. A key element of the convergence proof is the " block-invariance " feature of the algorithm. Namely, while the(More)
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