Applied Mechanics and Materials Vols. 530-531

Abstract: Undertaking practical education network platform is a network platform with strong practicalness, therere many security issues when developing and operating. From the angle of founding and operating a security website, this article focused on how to found a security operating environment and provide a security system service, put forward the suggest of referring to OWASP(The Open Web Application Security Project), and studied various kinds of security check mechanism. Using the methods above-mentioned can help avoid many faults during the operational process, decrease procedures operational risk, and found a efficient security mechanism.

Abstract: For DDoS attacks, it must be sniffing this step, the attacker to be able to successfully launch the final realization of the invasion and attack, we must find a suitable host computer and can be used as hosts puppet machine. In this thesis, a DDoS attack detection technologies, and further proposed based DDoS attack defense system design, the results show that our design can effectively prevent DDoS network attacks.

Abstract: This study based on characteristics of network traffic is significant, it can improve network design, improve network performance, is often used in the abnormal traffic detection and so on. In this paper, the significance of abnormal flow monitoring is design based on an analysis of network behavior anomaly traffic monitoring system, the system for use of the network traffic characteristics of network attacks detected has a good prospect.

Abstract: The Oil & Gas industry is moving forward with Integrated Operations (IO). There are different ways to achieve data integration, and ontology-based approaches have drawn much attention. This paper introduces an ontology-based distributed data integration framework (ODDIF). The framework resolves the problem of semantic interoperability between heterogeneous data sources in semantic level. By metadatas specifying the distributed, heterogeneous data and by describing semantic information of data source , having "ontology" as a common semantic model, semantic match is established through ontology mapping between heterogeneous data sources and semantic difference institutions are shielded, so that semantic heterogeneity problem of the heterogeneous data sources can be effectively solved. The proposed method reduces developing difficulty, improves developing efficiency, and enhances the maintainability and expandability of the system.

Abstract: So far there have never been systematic evaluation criteria and entire assessment and evaluation system in Data quality internationally. Based on the research on the relative content of both international and domestic data quality, this article analyzes the requests of data quality for the large enterprises. First of all, this paper raises and builds a complete data quality assessment system. Second, the definitions and specific algorithms of data quality assessment indicators and poses data quality analysis are built to evaluate the architecture and processes. A frame structure of data quality meta-model is presented in this paper. In addition, this paper also designs an evaluation system. This system includes the classification and definition of data quality and the algorithm in evaluation index and the system and process of data quality evaluation. This paper provides credibility basis for enterprises in evaluation of data quality.

Abstract: Although GIS application integration system has not officially formed, the distributed GIS application integration is the main means to implement the seamless integration between GIS and applications. This paper studied on the current situation of enterprises GIS application integration, and proposed an Loose Model Application Integration (LMAI) strategy based on meta-driven, defined the concept model and algorithm of application integration in loose coupling mode, designed the system integration framework of meta-model and applications, established the common application integration interface employing the Application-Oriented Component (AOC), developed the application integration system in GIS loose coupling mode underlying the Metadata-driven. Focusing on the GIS actual needs in gas field area, the effective integration and transmission query between GIS and the gas field professional application were implemented.

Abstract: Since the mobile radio communication in a wireless mobile environment, which inevitably subject to fading and interference effects of the various signals, multipath and time-domain signal to bring the mobile domain and frequency dispersion problems, bandwidth resources restricted and transmission delay increases and so on. In this paper, the use of Class R-Tree data structure to store the data on the basis of historical trajectory, the update query results by the beach line iterative way to solve the problem of nearest neighbor queries efficiently update existing intermediate results.

Abstract: With the developing of the network and information, we get the new requirements to our minority areas` e-government affairs,and Hbase can fit the new age of mass date, solving the problem such huge accessing which is nightmare for traditional relational database, to do our best in solving the vital interests of people which related to the job, medical, social security, education, housing issues, and make our life better.

Abstract: With the increasing of data volume and data dimensions in road network query, the response gets slow in searching services, which cannot satisfy users demand for preference-based searching. This paper proposes a user preference-based Skyline query algorithm. At the first stage, this method is based on the fact that the static property of data does not change during the query processes. Therefore, Skyline starts its calculation in the non-spatial data set to have the candidate results and dominance relation. Then it calculates the total costs of routine by defining user preference function. At the second stage, compare the data connections with the total costs of preference to minimize time for processing data and searching. The experiment result shows that the definition of user preference meets the users demand, and Skyline query algorithm benefits to have quick response.

Abstract: A method about embedding watermark in PDF document is proposed in this paper. First, PDF document is converted into a image format. Watermark image is converted into a scrambling image by Arnold transformation.And then the watermark is embedded into the PDF document image by discrete wavelet transform for PDF document image and matrix singular value decomposition for watermark image. Not only can watermark be extracted without the original image, but also increase the safety by this means. Experiment express, on the condition that the same size of the watermark image,the method made more copyright information as watermark be embedded into PDF document and the amount of the watermarked PDF document data be affected less with the increase of copyright information.