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A digital watermark is a secret pattern of bits inserted in the data objects to verify the integrity of the contents or to identify ownership. It is an effective technique for protecting various databases against data copyright infringement, ...

We propose the concept of fractal dimension of a set of points, in order to quantify the deviation from the uniformity distribution. Using measurements on real data sets (road intersections of U.S. counties, population versus area of different nations, ...

We consider the problem of exploiting parallelism to accelerate the performance of spacial access methods and specifically, R-trees [11]. Our goal is to design a server for spatial data, so that to maximize the throughput of range queries. This can be ...