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Analysis and research of security mechanism in IEEE 802.16j

Analysis and research of security mechanism in IEEE 802.16j

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2010 international conference on Anti-Counterfeiting, Security and Identification, 2010 ASID

作者： Dai, Xinmin Xie, Xiaoyao School of Computer Science and Technology Guizhou University Guiyang China Key Laboratory of Information and Computing Science of Guizhou Province Guizhou Normal University Guiyang China

ISBN: (纸本)9781424467327

With the development of wireless technologies, wireless networking market is thriving. IEEE 802.16j mobile multi-hop relay (MMR) network is likely to achieve great market success because it provides an attractive solution for the coverage extension and throughput enhancement of IEEE 802.16e network. However, security issues can restrain its development. IEEE standard 802.16j-2009 has been published in 2009. Although a number of advanced security schemes are employed in IEEE 802.16j, it still has a few security flaws. In this paper, the security architecture is described in IEEE 802.16j standard. The security mechanism of IEEE 802.16j under different mode (centralized security control and distributed security control) is discussed. In particular, the new features on security sublayer in IEEE 802.16j are analyzed in detail. Finally, some possible existed security deficiencies are revealed, and their impacts on multi-hop relay system are assessed. © 2010 IEEE.

关键词： IEEE Standards

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RETRACTED ARTICLE: Direction of automobile power's development

RETRACTED ARTICLE: Direction of automobile power's developme...

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作者： Tong, Jiabin Bao, Yujun Suizhon Vocational and Technical College Suizhou China School of Electronic Information and Electric Engineering Changzhou Institute of Technology CZU Changzhou China

ISBN: (纸本)9781424472369

In 2009, the automobile sales in China have reached 13.7 million. China has been the oil import country for many years. So, the research about the direction of automobile power's development is related to the safety of Chinese economy. In this paper, we have compared all kinds of electric automobiles' main cost performance and influence on the environment. And we have concluded that electric automobile is the development priority in Chinese automobile industry. We also have planned the plan of electric automobile's development which powered by lead-acid battery. And this is also the development direction of automobile in China. © 2010 IEEE.

关键词： Vehicle performance

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ANFIS Supported Question Classification in computer Adaptive Testing (CAT)

ANFIS Supported Question Classification in Computer Adaptive...

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5th international conference on Soft Computing, Computing with Words and Perceptions in System Analysis, Decision and Control

作者： Karahoca, Adem Karahoca, Dilek Ince, Furkan Bahcesehir Univ Fac Engn Istanbul Turkey Kyungsung Univ Grad Sch Digital Design Busan South Korea

ISBN: (纸本)9781424434299

E-learning has become a major trend in the computer assisted teaching with the rapid development of Internet technologies. Web-based education is a very important component of education technology. One of the main advantage is the classroom and platform independence. Implementing Artificial Intelligence (Al) techniques to support efforts to improve the Web's intelligence and provide better services to the end users. In this study, three popular Al methods: Artificial Neural Network (ANN), Support Vector Machines (SVM), and Adaptive Network Based Fuzzy Inference System (ANFIS) were benchmarked in terms of effectiveness and performance within a Web-based environment. As the pilot test, "History of Civilization" class was selected. The question classification abilities depending on the item responses of students, item difficulties of questions, and question levels were determined by using Gaussian Normal Curve. Comparison study was conducted by considering the performance and class correctness of the sample questions (n=13) by using the given three inputs. The results showed that ANFIS has better performance than ANN and AVM in web-based education.

关键词： E-learning

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Bit Assignment Optimization for ROI of CCSDS Image Compression Standards Based on DWT

Bit Assignment Optimization for ROI of CCSDS Image Compressi...

引用

international conference on Space Information technology 2009

作者： Zhang Jiayan Zhao Honglin Ma Jing Cui Yang Harbin Inst Technol Commun Res Ctr Harbin 150080 Peoples R China Harbin Inst Technol State Key Lab Tunable Laser Technol Harbin 150080 Peoples R China

ISBN: (纸本)9780819480798

In deep space exploration, image compression plays an important role in maximizing returned scientific data. CCSDS adopts the methods based on Discrete Wavelet Transformation as the image compression standards because of its high compression ratio, progressive transmission and supporting lossless compressing. According to its feature, a new image compression scheme - Region of Interest encoding is presented for balancing the initial image acquiring rate, buffer size and data transmission rate on spacecraft in deep space communication. It is performed by which ROI is assigned with lower compression ratio, more storage space, and higher transmission priority. Thus it could be attained the goal of acquired image in deep space communication-maximizing information returning to the ground. And an optimized bit allocation method between ROI and Non-ROI is proposed according to rate-distortion model that is fit for progressive wavelet coding rate and distortion. Based on taking 2-level priority as an example, an optimized bit allocation method between ROI and Non-ROI is discussed. Simulation results show that the performance of the scheme is satisfying.

关键词： Image compression Wavelets Discrete wavelet transforms Image transmission Distortion Quantization Image quality standards computer programming Standards development Stereolithography

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Outdoor performance of polycrystalline and amorphous silicon solar cells based on the influence of irradiance and module temperature in Thailand

Outdoor performance of polycrystalline and amorphous silicon...

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7th Annual international conference on Electrical Engineering/Electronics, computer, Telecommunications and Information technology, ECTI-CON 2010

作者： Thongpao, Kitiphop Sripadungtham, Patamaporn Raphisak, Pisut Sriprapha, Kobsak Hattha, Ekkachart Department of Electrical Engineering Faculty of Engineering Kasetsart University Chatu-chak Bangkok 10900 Thailand Institute of Solar Energy Technology Development National Science and Technology Development Agency Klongluang Pathumthani 12120 Thailand

ISBN: (纸本)9789746724913

This study aimed to focus on the outdoor performance ratio (PR) and the relationship between PR, module temperature and irradiance for (a-Si) and polycrystalline silicon (poly-Si) located in Thailand. The result of this study revealed that the PR of a-Si increased during the summer and reached the highest value in the rainy season. For a 3-year period investigation, average PR of a-Si showed higher values than the PR values at standard test condition (STC) and also higher than the PR of poly-Si. However, during winter, PR value of a-Si gradually decreased. The lowest PR value occurring in winter was lower than the highest value occurring in rainy season by 7 .0 %. In addition, during summer and rainy periods from 2006 to 2007, the PR value of a-Si degraded by approximately 0.5% whereas it declined by 2% from 2008 to 2009 in winter. Furthermore, the results also indicated that the PR value of poly- Si decreased when the temperature increased. In addition, both types of solar cell have the same behavior of Voc and Isc based on the influence of intensity and temperature.

关键词： Amorphous silicon

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Investigation and analysis on the development trends of learning management system over the past five years (from 2005 to 2009)

Investigation and analysis on the development trends of lear...

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18th international conference on computers in Education: Enhancing and Sustaining New Knowledge Through the Use of Digital technology in Education, ICCE 2010

作者： Lin, Yen-Ting Huang, Shu-Hsien Wu, Ting-Ting Lin, Yi-Chun Yang, Yu-Sheng Huang, Yueh-Min Cheng, Shu-Chen Department of Engineering Science National Cheng Kung University No. 1 Ta-Hsueh Road Tainan 701 Taiwan Department of Computer Science and Information Engineering Southern Taiwan University No.1 Nantai St. Yongkang City Tainan 710 Taiwan

ISBN: (纸本)9789834251253

The booming of information technology has influenced the evolution of learning patterns and the integration of information technology into teaching has became one of the mainstream methods. The teaching and delivery of knowledge are no longer restricted to traditional lectures. As Learning Management System (LMS) at the present stage can accommodate a diversity of learning requirements and functions, there are many literatures to study on the application of the LMS. However, as the development of relevant industries and technologies, users' requirements on the LMS may be influenced and changed. How will these changes affect the development of the LMS? What are the changes and developments of the LMS required for addressing the current and future requirements of the users? To address these questions this study aims to perform a comprehensive investigation on the technologies, applications, and analysis of the LMS to realize the developments of the LMS.

关键词： Information management

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Object Databases - Second international conference, ICOODB 2009, Revised Papers

Object Databases - Second International Conference, ICOODB 2...

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2nd international conference on Object Databases, ICOODB 2009

ISBN: (纸本)3642146805

The proceedings contain 9 papers. The topics discussed include: orthogonal persistence revisited;verification technology for object-oriented/XML transactions;compiler plugins can handle nested languages: AST-level expansion of LINQ queries for Java;active components as a method for coupling data and services - a database-driven application development process;optimization of object-oriented queries involving weakly dependent subqueries;metamodelling with datalog and classes: ConceptBase at the age of 21;unified event model for object databases;multi-granular spatio-temporal object models: concepts and research directions;and mapping XSD to OO schemas.

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AppScale: Scalable and Open AppEngine Application development and Deployment

引用

1st international conference on Cloud Computing (CloudComp 2009)

作者： Chohan, Navraj Bunch, Chris Pang, Sydney Krintz, Chandra Mostafa, Nagy Soman, Sunil Wolski, Rich Univ Calif Santa Barbara Dept Comp Sci Santa Barbara CA 93106 USA

ISBN: (纸本)9783642126352

We present the design and implementation of AppScale, an open source extension to the Google AppEngine (GAE) Platform-as-a-Service (PaaS) cloud technology. Our extensions build upon the GAE SDK to facilitate distributed execution of GAE applications over virtualized cluster resources, including Infrastructure-as-a-Service (IaaS) cloud systems such as Amazon's AWS/EC2 and EUCALYPTUS. AppScale provides a framework with which researchers can investigate the interaction between PaaS and IaaS systems as well as the inner workings of, and new technologies for, PaaS cloud technologies using real GAE applications.

关键词： Cloud Computing PaaS Open-Source Fault Tolerance Utility Computing Distributed Systems

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THREE-DIMENSIONAL KERNEL development WITH PARASOLID FOR INTEGRAL SHEET METAL DESIGN WITH HIGHER ORDER BIFURCATIONS

THREE-DIMENSIONAL KERNEL DEVELOPMENT WITH PARASOLID FOR INTE...

引用

ASME international Design Engineering Technical conferences/computers and Information in Engineering conference

作者： Rollmann, Thomas Schule, Anselm Anderl, Reiner Chahadi, Youssef Tech Univ Darmstadt Fac Mech Engn Dept Comp Integrated Design Darmstadt Germany

ISBN: (纸本)9780791848999

The technology of linear flow splitting to produce bifurcated sheet metal structures is researched by the collaborative research center 666 since 2005 So far the product design process is supported by 3D-CAD models on the basis of User Defined-Features in standard 3D-CAD systems This paper now presents a new ap proach for generating 3D models of integral sheet metal design products with higher order bifurcations based on a low level 3D-kernel The emphasis is placed on two aspects, namely the processing of the model s topology and geometry as well as the software implementation First a methodology for the generation and manipulation of the geometry and topology of the Boundary Representation (B-Rep) structure is proposed This methodology is integrated into an algorithm-based product design approach, which enables engineers to plan and design their complete draft for bifurcated sheet metal parts in an automated, computer aided way Further functionalities to support the subsequent manufacturing process are developed and integrated The idea is then implemented by developing a 3D CAD application using the B-Rep CAD kernel Parasolid The programming framework NET has been chosen for the development of the software on a Windows NT platform using the object oriented C++ and C# programming languages The work presented here has significant implications on the quality accurateness and efficiency of the product generation process of sheet metal products with higher order bifurcations

关键词： Geometry Flow (Dynamics) computer-aided design Three-dimensional models computer programming languages Topology Sheet metal Three-dimensional computer-aided design Design computer software Product design Bifurcation Algorithms computer-aided engineering Engineers computer programming Manufacturing

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computer-based process-genre approach in english composition writing

Computer-based process-genre approach in english composition...

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international conference on Educational and Information technology

作者： Cai, Huiping Luo, Yi Li, Hongying School of Foreign Languages Zhejiang Ocean University Zhoushan China Teacher Development Center Zhejiang Ocean University Zhoushan China

ISBN: (纸本)9781424480340

This experiment is based on the theory of process-oriented approach from social cognitive psychology perspective and the theories of genre analysis from the angle of functional linguistics and social-linguistics. It is a practical research which aims for the teaching reform of English writing at the college level in China. It has been implemented in the last four years, which is a continuation of the teaching experiment adopting the "genre analysis approach" from 2005 to 2009. The purpose of the reform is to further promote the exploration into and research on teaching English writing in regular institutions of higher learning. The subjects involved in this round of experiment are 400 sophomores majoring in English from a provincial regular institution of higher learning. The paper reports the visible progress made in students' writing resulting from the reform in the teaching approach and the improvement in the teaching environment and teaching means. © 2010 IEEE.

关键词： Linguistics

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