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Monte Carlo method of polygon intersection test

Journal of Computational Information Systems 2013年第12期9卷 4707-4713页

作者： Zhou, Chuan'ai Cui, Huanqing School of Information Engineering Qingdao Binhai University Qingdao 266555 China Shandong Provincial Key Laboratory of Computer Network Shandong Computer Science Centre Jinan 250101 China College of Information Science and Engineering Shandong University of Science and Technology Qingdao 266590 China

The intersection test of polygons is a basic problem in many fields, and most of existing methods focused on intersection test of convex polygons. This paper proposes MCPI, a Monte Carlo intersection test method, which can be used for concave polygons. The MCPI converts the intersection test of polygons into the judge of position relationship between points and a polygon. This algorithm is efficient with polynomial time complexity. Both theoretical and experimental analysis showed that it achieves accuracy rate of 99% when the area of intersection part is 1% of a polygon and 500 points are randomly chosen in this polygon. The cell decomposition is taken as an example to illustrate the feasibility of the algorithm. © 2013 by Binary Information Press.

关键词： Monte Carlo methods

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A new fractional-order chaotic complex system and its antisynchronization

Abstract and Applied Analysis

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Abstract and Applied Analysis 2014年第SI53期2014卷 1-11页

作者： Jiang, Cuimei Liu, Shutang Luo, Chao College of Control Science and Engineering Shandong University Jinan 250061 China School of Information Science and Engineering Shandong Normal University Jinan 250014 China Shandong Provincial Key Laboratory for Novel Distributed Computer Software Technology Jinan 250014 China

We propose a new fractional-order chaotic complex system and study its dynamical properties including symmetry, equilibria and their stability, and chaotic attractors. Chaotic behavior is verified with phase portraits, bifurcation diagrams, the histories, and the largest Lyapunov exponents. And we find that chaos exists in this system with orders less than 5 by numerical simulation. Additionally, antisynchronization of different fractional-order chaotic complex systems is considered based on the stability theory of fractional-order systems. This new system and the fractional-order complex Lorenz system can achieve antisynchronization. Corresponding numerical simulations show the effectiveness and feasibility of the scheme. © 2014 Cuimei Jiang et al.

关键词： SYNCHRONIZATION CHAOS synchronization LYAPUNOV exponents LYAPUNOV functions BIFURCATION theory

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LSA-PTM: A propagation-based topic model using latent semantic analysis on heterogeneous information networks

LSA-PTM: A propagation-based topic model using latent semant...

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14th International Conference on Web-Age Information Management, WAIM 2013

作者： Wang, Qian Peng, Zhaohui Jiang, Fei Li, Qingzhong School of Computer Science and Technology Shandong University Jinan China Shandong Provincial Key Laboratory of Software Engineering China

ISBN: (纸本)9783642385612

Topic modeling on information networks is important for data analysis. Although there are many advanced techniques for this task, few methods either consider it into heterogeneous information networks or the readability of discovered topics. In this paper, we study the problem of topic modeling on heterogeneous information networks by putting forward LSA-PTM. LSA-PTM first extracts meaningful frequent phrases from documents captured from heterogeneous information network. Subsequently, latent semantic analysis is conducted on these phrases, which can obtain the inherent topics of the documents. Then we introduce a topic propagation method that propagates the topics obtained by LSA on the heterogeneous information network via the links between different objects, which can optimize the topics and identify clusters of multi-typed objects simultaneously. To make the topics more understandable, a topic description is calculated for each discovered topic. We apply LSA-PTM on real data, and experimental results prove its effectiveness. © 2013 Springer-Verlag Berlin Heidelberg.

关键词： Semantics

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Placement of SaaS cloud data and dynamically access scheduling strategy

Placement of SaaS cloud data and dynamically access scheduli...

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8th International Conference on computer science and Education, ICCSE 2013

作者： Hou, Dezhi Zhang, Shidong Kong, Lanju School of Computer Science and Technology Shandong University Shandong Provincial Key Laboratory of Software Engineering Jinan 250022 China

ISBN: (纸本)9781467344623

For SaaS applications which share tables in storage, how to effectively manage multi-tenant cloud data has been one of the crucial issues. In SaaS delivery platform multi-tenant data migration strategy, put whole data of every tenant including his/her business data and metadata into independent partition, where DBMS can guarantee ACID. Unfortunately, placing the partitions and the replica of them on randomly nodes maybe easily influenced load balancing of nodes. What's more, it may increase the data access time and cost of updating replication. Therefore, we propose multi-tenant cloud data and replica placement strategy based on the graph, we take network distance and load balancing of nodes into account. We also propose a dynamic scheduling method according to the load state of nodes. We use the Paxos algorithm to further ensure that the SaaS application system availability and consistency. Experiments show that, the proposed strategy can not only improve load balancing, but also can reduce the time for updating replica of partitions, reduce the cost of accessing data. © 2013 IEEE.

关键词： Digital storage

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A quantitative method for branching morphology of soybeans and its visualization based on L-system

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Information technology Journal 2013年第16期12卷 3487-3495页

作者： Xueqiang, Ma Hong, Liu Xianzhong, Feng Wen, Wang School of Information Science and Engineering Shandong Normal University Jinan 250014 Shandong China Shandong Provincial Key Laboratory for Novel Distributed Computer Software Technology China Shandong Provincial Key Laboratory of Systems Biology China School of Management Engineering Shandong Jianzhu University Jinan 250101 Shandong China

Branching morphology is a crucial factor in phenotype of soybeans and the primary tissue to transport nutrients. After the acquirement of an empirical model and distribution interval for soybeans height by nonlinear regression analysis, we, guided by the pipe model theory, quantified the main stem, branch and internode of soybeans using the taper stem equation and S-curve equation. A novel L-system was finally proposed to construct the branching form by means of the numerical nomenclature coding system and the visual simulation was performed. This technique expanded the application fields of L-systems and offered an innovative computational thinking and pattern in the research and application of the best soybeans plant type design and prediction of soybeans yield, etc. © 2013 Asian Network for Scientific Information.

关键词： Morphology

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Towards the scheduling of access requests in cloud storage

Towards the scheduling of access requests in cloud storage

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8th International Conference on computer science and Education, ICCSE 2013

作者： Wu, Xian Qian, Peide School of Computer Science and Technology Computer Information Processing Technology Suzhou University Suzhou 215006 China Jiangsu Provincial Key Laboratory Computer Information Processing Technology Suzhou University Suzhou 215006 China School of Computer Science and Technology Suzhou University Suzhou 215006 China

ISBN: (纸本)9781467344623

In recent years, cloud computing has emerged as an enabling technology, in which virtual machine migration and dynamic resource allocation is one of the hot issues. During the migration of virtual machine, access requests from end users coming constantly. So how to schedule these requests to ensure the performance of cloud storage system is the key issue. In this paper, we focus on scheduling access requests to provide end users desirable data when virtual data nodes are migrating. In this process, we interested in the following performance in the system: the availability of data, energy consumption and cost. The contributions of this paper are: 1) analyze the open issues of scheduling in cloud storage;2) present the environment of scheduling access requests in cloud storage and discuss metrics which affect the scheduler;3) define the formal concepts about this problem and give the main steps of scheduling algorithm. The main innovation of this paper is fully taken into account data node's mobility in cloud storage. So we could establish the connection between resource availability and system availability. The results of this paper can be used in scheduling and resource management in cloud storage system to provide the mass storage of streaming media in cloud and its continuous access. © 2013 IEEE.

关键词： Scheduling

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An iterative space alternative tiling parallel algorithm for 3D finite difference stencil computations

International Journal of Database Theory and Application

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International Journal of Database Theory and Application 2014年第6期7卷 105-120页

作者： Shen, Jing Zhang, Jilin Wan, Jian Zhou, Li Jiang, Ming School of Computer Science and Technology Hangzhou Dianzi University Hangzhou Zhejiang China Key Laboratory of Complex Systems Modeling and Simulation Ministry of Education China Zhejiang Provincial Engineering Center on Media Data Cloud Processing and Analysis Hangzhou China School of Information Engineering Hangzhou Dianzi University Hangzhou Zhejiang China

Stencils are finite-difference algorithms for solving large-scale and high-dimension partial differential equations. Due to the data dependences among the iterative statements in Stencils, traditional Stencil computations are be executed serially, rather than in parallel. It's challenging to design an effective and scalable Stencil parallelized method. To address the issue of 3D data space computing, we present a serial execution model based on multi-layers symmetric Stencil method and time skewing techniques. Within this model, the iteration space is divided to multiple tiles based on time skewing, where the executive process is ordered by the sequence of tiles, and the nodes in each individual tile can be swept repeatedly to improve the data locality. In addition, we propose a novel 3D iterative space alternate tiling Stencil parallel method, which subdivides the iteration space along high dimension, and changes the execution sequence of tiles to reduce the data dependency and communication cost, where the partial order of tiles is still guaranteed. Experimental results demonstrate our proposed alternative tiling parallel method achieves better parallel efficiency and scalability compared with the domain-decomposition methods.

关键词： Iterative methods

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Secure Deduplication Storage Systems with keyword Search

Secure Deduplication Storage Systems with Keyword Search

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IEEE International Conference on Advanced Information Networking and Applications

作者： Jin Li Xiaofeng Chen Fatos Xhafa Leonard Barolli School of Computer Science Guangzhou University China State Key Laboratory of Integrated Service Networks (ISN) Xidian University P.R. China Department of Languages and Informatics Systems Technical University of Catalonia Barcelona Spain Department of Information and Communication Engineering Fukuoka Institute of Technology Japan

ISBN: (纸本)9781479936311

Data deduplication is an attractive technology to reduce storage space and upload bandwidth for increasing vast amount of duplicated and redundant data. In a cloud storage system with data deduplication, duplicate copies of data will be eliminated and only one copy will be kept in the storage. To protect the confidentiality of sensitive data while supporting deduplication, the convergent encryption technique has been proposed to encrypt the data before outsourcing. However, the issue of keyword search over encrypted data in deduplication storage system has to be addressed for efficient data utilization. This paper firstly proposes two constructions which support secure keyword search in this scenario. In these constructions, the integrity of the data can be realized by just checking the convergent key, without other traditional integrity auditing mechanisms. Security analysis demonstrates that our keyword search schemes are secure in terms of the definitions specified in the proposed security model.

关键词： Deduplication distributed storage system reliability secret sharing

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Survey of DCA for abnormal detection

Journal of Software

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Journal of Software 2013年第8期8卷 2087-2094页

作者： Ding, Lei Yu, Fei Yang, Zhenghua School of Information Science and Engineering Jishou University Jishou 416000 China Jiangsu Provincial Key Laboratory for Computer Information Processing Technology Soochow University Soochow 215006 China School of Information Science and Engineering Jishou University Jishou 416000 China

As a latest immune algorithm, dendritic cell algorithm (DCA) has been successfully applied into the abnormal detection. First, this paper reviewed the research progress of DCA from the following aspects: signal extraction technology, DCA signal processing technology, the decision method for load anomaly judgment, and the application research of DCA. Next, the corresponding solving thoughts for the main problems existing in the DCA were proposed in this paper. Finally, the future research trends of DCA were presented in this paper. © 2013 ACADEMY PUBLISHER.

关键词： Signal processing

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A scheme for the identity authentication of college social network management

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Information technology Journal 2013年第20期12卷 5901-5905页

作者： Xu, Dawei Wen, Hui Nie, Peiyao Sun, Mei Dong, Zhiguo School of Computer Science and Technology Shandong University of Finance and Economics Shandong Provincial Key Laboratory of Digital Media Technology Jinan Shandong 250014 China School of public Management Shandong University of Finance and Economics Jinan Shandong 50014 China

Network management is the necessary means to ensure that large-scale heterogeneous network running smoothly , the core idea of College social network management based LDAP is to use LDAP to store and access the network management data and implement the user authentication system who based the core of directory and conduct unified identity authentication on campus, to improve the ability of network management, to improve the application efficiency of the digital campus greatly. © 2013 Asian Network for Scientific Information.

关键词： Network management

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