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One of the main issues in contemporary AOP languages and frameworks is the expressiveness of the pointcut language. This paper proposes an extension mechanism for enriching pointcut languages with constructs that play the role of “new primitive pointcuts” and allow the creation of pointcuts with greater semantic value. Join point selectors are a generalization of the primitive pointcuts of curr...

We investigate whether a sound and complete formal system for join dependencies can be found. We present a system that is sound and complete for tuple generating dependencies and is strong enough to derive join dependencies from join dependencies using only generalized join dependencies in the derivation. We also present a system that sound and complete for tuple generating dependencies and is ...

Skyline Join approach in its Naïve age work as it computes join first and then apply skyline computation to find corresponding skyline objects. Considering increase in cardinality and dimensionality of join table the cost of computing skyline in a non-reductive join relation is costlier than that of on single table. Most of the existing work on skyline queries for databases mainly discusses the...

The join-calculus was introduced as anèxtended subset' of the asynchronous-calculus by amalgamating the three operators for input, restriction, and replication into a single operator, called deenition, but with the additional capability to describe the atomic joint reception of values from two diierent channels. In this paper, we just extend the asynchronous-calculus with joint input. By studyi...

We introduce endogenous political parties into the Hotelling-Downs voting framework to model the selection of candidates. First, activists choose which party to join, if at all. Second, party members select a champion for the general election. Third, the electorate median voter determines the (stochastic) general election outcome. Although party members trade off win probabilities candidate loc...

In this paper, we propose a general spatiallypartitioned temporal operation model, called 3D-TOM, and partition-based join algorithms for various types of temporal join in the proposed model. The temporal operators addressed in this paper include overlap, precede, follow, and equal. Some factors which a ect the performance of the proposed method are also discussed.

Gilles CHAMPENOIS Collège Saint-André, Saint-Maur, France [email protected] ABSTRACT. Grainy numbers are defined as tuples of bits. They form a lattice where the meet and the join operations are an addition and a multiplication. They may be substituted for the real numbers in the definition of fuzzy sets. The aim is to propose an alternative negation for the complement that we’ll call ...

This paper presents some experimental results on the performance of distrihuted join algorithms in a local nctwol-k. Eight different join methods have been implemented in an experimental distrihuted system, the Cryseal multicomputcr, and tested for join queries with a variety of relation sizes, join selcctivitics, and join column value distributions. The results obtained indicate that pipelined...