This paper describes a new Map-Matching method relying on the use of Particle Filtering. Since this method implements a multi-hypothesis road-tracking strategy, it is able to handle ambiguous situations arising at junctions or when positioning accuracy is low. In this Bayesian framework, map-matching integrity can be monitored using normalized innovation residuals. An interesting characteristic...

Equality data bases are important in facilitating proofs of equality between terns. They are useful in the implementation of code optimizers [2], program verifiers [7,9], theorem provers [I], and symbolic execution systems [S]. In these applications the typical operations are determining whether or not two terms are known to be equal and updating the data base to include a new equality. Some so...

Systems analysis is the examxna.t on of a problem situation in order to define the requirements of a solution, often computerized, to that problem. The diversity of prob ems and the constraints of computing technology require that a probWra be thoroughly analyzed in order to insure that the problem is claarly understood. Then, and only then, it can be determined how ccuputing technology can be ...

In this paper we report on query processing experiments that were performed in one distributed data base environment. In this environment we compared the strategy produced by a collection of algorithms on the basis of number of bytes moved. Among other conclusions we found that limited search algorithms do not perform very well compared to algorithms which exhaust all possible processing plans.

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The earth’s environmental problems have attracted serious attention worldwide. Various kinds of environmental data, such as remote sensing data, have become available for examining. Although this data is crucial to understanding such problems, there has become an over-abundance in variety of size, format, and filetype which makes it difficult for researchers to handle. We feel that earth enviro...