Contents 1 Introduction 1 1.

For many emerging applications and environments , information systems designers and im-plementors must consider the tradeoos between eeciency and the quality of query answers. This exibility, while allowing numerous opportunities for optimization, complicates the development of various system components and their performance evaluation. In this short paper, we begin by outlining issues that ari...

Performance evaluation is one of the most important issues in the field of parallel kinematic manipulators (PKMs). As a very important class of PKMs, the redundant PKMs have been studied intensively. However, the performance evaluation of this type of PKMs is still unresolved and a challenging endeavor. In this paper, indices that assimilate motion/force trans...

Low-cost massively parallel architectures are generally characterized by a limited amount of memory owned by each Processing Element. As a consequence, low-cost mesh-connected architectures can utilize only a speciic processor virtualization mechanism which is based on the sequential scanning of the data set stored in an external memory. As a consequence of this virtualization mechanism, applic...

Similarity search in math is to find mathematical expressions that are similar to a user’s query. We conceptualized the similarity factors between mathematical expressions, and proposed an approach to math similarity search (MSS) by defining metrics based on those similarity factors [11]. Our preliminary implementation indicated the advantage of MSS compared to nonsimilarity based search. In or...

We present in this paper a study of unsupervised evaluation criteria that enable the quantification of the quality of an image segmentation result. These evaluation criteria compute some statistics for each region or class in a segmentation result. Such an evaluation criterion can be useful for different applications: the comparison of segmentation results, the automatic choice of the best fitt...

Similarity Joins are extensively used in multiple application domains and are recognized among the most useful data processing and analysis operations. They retrieve all data pairs whose distances are smaller than a predefined threshold ε. While several standalone implementations have been proposed, very little work has addressed the implementation of Similarity Joins as physical database opera...

Hydrofoil assistance on a catamaran model was tried twenty years ago and an unexpected resistance improvement of 40% initiated the creation of a research project to investigate the effect. Today the research project is still active inspite of designs and model tests resulting in the construction of over 200 Hysucats. Theoretical efforts to determine the hydrodynamics of the Hysucat principle re...

A software platform for demonstration and performance evaluation of network aware joint optimization of wireless video transmission is presented in this paper. This demonstrator has been realized in the framework of the IST PHOENIX project (www.ist-phoenix.org) and is based on the joint system optimization model developed by the project. After a description of the considered cross-layer approac...

Query optimizers often have diiculties with the treatment of user-deened functions. In particular, the optimization of joins involving complex, user-deened predicates rather than just simple arithmetic comparisons may lead to query plans of poor quality. In this paper, we identify a class of user-deened functions that can be included in queries in such a way that eecient query optimization is s...