Advanced Materials Research Vols. 926-930

Abstract: Materialized view is an effective mothed for improving the efficiency of queries in data warehouse system,and materialized views selection problem is one of the most important decisions in designing a data warehouse.This paper begins with a brief introduction to materialized view and study of the existing materialized viewalgorithm.Then in order toselect an appropriate set of views that minimizes total query response timeand the cost of maintaining the selected views under a limitedstorage space, a hybrid algorithm combined with the advantages of ant colony algorithm and immune genetic algorithm is proposed.Inaddition,analyze the shortcomings of this algorithm and propose some improvement ideas, which optimize the efficiency of algorithm to some extent.

Abstract: Image watermarking is a carrier image watermarking technology. This paper studies the research direction of the digital watermarking image of the DCT-based image robust watermarking algorithm design. We studies robust algorithm of watermarking image on specific design and implementation process based on DCT domain, the process including image watermarking embedding and watermarking extraction and watermarking detection. Experimental results achieved watermarking embedding evaluation requirements: effectiveness, transparency and robustness.

Abstract: As everyone knows, mathematics is the basis of the optimization technology. With the development and progress of the society for a long time, there are many complicated practical problems during people’s research as well as some binding and nonlinear characteristics. If people still take the traditional optimization ways, such as Newton method and the simplex algorithm, they can not get rid of these problems effective particle swarm optimization algorithm and its applications in optimization theory in order to provide some useful references.

Abstract: Two mufflers of single exhaust muffler and double exhaust muffler were researched based on the method of AML technology of acoustic simulation software LMS Virtual lab and got transmission loss graph of the two mufflers, indicating that the single exhaust muffler had better effect of noise reduction. Then the fluid simulation was carried out on two mufflers and velocity and pressure cloud maps were draw based on the method of computational fluid dynamics in FLUENT. It is pointed out that the double exhaust muffler is slightly greater than the single exhaust muffler on pressure loss, this is because the airflow in single exhaust muffler is mainly jet flow and the pressure loss is mainly local pressure loss, while the airflow of double exhaust muffler is mainly rotary flow and the pressure loss is mainly frictional pressure loss. The impact that the airflow has on the cavity of the double exhaust muffler is higher.

Abstract: Multi-objective optimization is a kind of optimization commonly existed in the engineering practice, and the GA is widely applied in the multi-objective optimization issue. In order to improve the GA’s effect on the multi-objective optimization issue, the paper proposes the improved strategy, introduces the heap sort mechanism, improves the scouting speed of GA, reduces the convergence range, reduces the time complexity and spatial complexity. Through the example simulation, the effectiveness and superiority of the improved strategy are proved.

Abstract: As the features in Computational Grids such as heterogeneous and dynamic, grid task scheduling is an NP-complete problem. For existing energy consumption in CGs ,and based on the study of scheduling algorithms and energy, this thesis selects four kinds of intelligent algorithms GA, DE, HC and SA to analysis and implementation, and relatively researchs their makespan and energy consumption for energy-aware scheduling.

Abstract: The region innovation system has provided the network platform for the knowledge dissemination and the flowing, simultaneously in the region the high-tech industry colony's knowledge overflow promoted the knowledge in region sharing, becomes the region innovation the driving force. This article has constructed the region innovation system life cycle model based on the baud life cycle theory, has studied under the knowledge economy condition the high-tech industry colony knowledge overflow to the region innovation system different life cycle influence mechanism.

Abstract: Since the current search sorting algorithms cannot find the desirable webpages quickly and accurately, a novel search sorting algorithm based on multi-dimensional matching is proposed in this study. This algorithm computes the semantic similarity of search terms based on ontology concept, and then the relevance of temporal information of those search terms with time of webpage. As a result, the relevance of the search term with the content of the webpage is calculated, hence realizing most appropriate webpage sorting. Finally, several methods are compared in terms of their average precisions and average recall ratios.

Abstract: The system for automatic analysis of test papers needs a algorithm which is efficient and converges fast, Genetic Algorithm is just fit for it.The paper is mainly discuss the basic concept of Genetic Algorithm,three important Genetic operator, the general step of Genetic Algorithm, and introduction of the system for automatic analysis of test papers.We follow the coding,selecting,crossover and mutation of Genetic Algorithm,discuss the process of automatic analysis of test papers.

Abstract: A method of traffic congestion identification based on traffic assignment model and SA-PC method is presented through analysis of municipal traffic congestion characteristic. Whether traffic congestion occurs or not is considered as a special classification problem. If the branch road of city is not affected by the signal light, the traffic situation is divided into tow parts: congestion and unimpeded. Using data associated with the traffic parameter for congestion and non congestion, an incremental SA-PC method is trained to detect whether traffic congestion occur or not. Experimental results based on microcosmic traffic simulation indicate that this method is not only feasible but also effective.