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Join is a fundamental operator in a Data Stream Management System (DSMS). It is more efficient to share execution of multiple windowed joins than separate execution of everyone because the former saves a part of cost in common windows. Therefore, shared window join is adopted widely in multi-queries DSMS. When all tasks of queries exceed maximum system capacity, the overloaded DSMS fails to process...
The Web service composition is one of the most effective ways to combine the current net resources and realize the re-utilization and satisfy the personalized requirements, and the foundation of the composition is the Web service selection. Expounded the basic principle of genetic algorithm, and brought the genetic algorithm in the field of Web service selection, and transferred the problem of Web...
As an intelligent algorithm with the mechanism of positive feedback, the ant colony algorithm is useful in solving the optimal problem. Web service selection is the foundation of the Web service composition which is one of the most important ways to satisfy the users' personalized requirements. Firstly, analyzed the problem of Web service selection based on expounding the basic principle of ant colony...
The Web service composition is one of the most important ways to satisfy the users' personalized requirements and supply the high quality service for users, and the foundation of service composition is the selection of Web service. Firstly, expounded the basic principle of Ant Colony Algorithm and analyzed the model of Web service selection and brought the algorithm into the fields of Web service...
When a Data Stream Management System (DSMS) becomes overloaded and fails to satisfy all kinds of requirements, such as tuple latency and result precision because the arrival rates are bursty. Especially, real-time queries have to be completed within certain deadlines for results to be full of value. Semantic load shedding is an effective approach to alleviate workload. A semantic load shedding algorithm...
Data stream management systems (DSMSs) usually need to satisfy multiple QoS requirements of applications, including timing and precision constraints. This paper focuses on the problem of real-time query model and scheduling in a DSMS to meet multiple performance objectives. At first, a mixed real-time query model is introduced which is composed of periodic, continuous and one-time queries with deadlines...
In this paper, Web Service composition completeness estimation problem (SCEP) was proposed so as to prognosticate whether services can be successfully composed ahead of time. To solve the problem, first of all, we proposed a three-level model for SCEP, and gave the mapping way between situation theory and BPEL4WS. In this way, we can take advantage of situation calculus to describe service composition...
When streams rates exceed the system capacity, a data stream management system (DSMS) becomes overloaded and fails to satisfy all kinds of requirements, such as tuple latency and result precision. Especially, in a time-critical environment, queries should be completed not just timely but within certain deadlines. Semantic load shedding is an effective approach to alleviate workloads. In order to improve...
Load shedding is a challengeable issue in data stream management systems (DSMSs). When data stream rates exceed system capacity, the overloaded DSMS fails to process all of its input data and keep up with the rate of data arrival. Especially, in a time-critical environment, queries should be completed not just timely but within certain deadlines. Existing strategies are poor at handling huge fluctuant...
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