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Extended DCEL data structure for mobile computing

Extended DCEL data structure for mobile computing

引用

international conference on information technology - coding and computing

作者： Li, JH Liang, XJ Gewali, LP Univ Nevada Sch Comp Sci Las Vegas NV 89154 USA

ISBN: (纸本)0769521088

Face routing is one of the effective techniques for constructing source destination route in mobile ad-hoc networks (MANET). Face routing can always construct path if the MANET is connected. However, face routing can generate routes with large number of hops. We propose an improved face routing algorithm that constructs shorter routes even when the route is forced to go through a face with large number of edges. We propose a new data structure ExtDCEL that can be used to represent both planar and non-planar networks. We present an implementation of several location based routing algorithms by using the proposed data structure.

关键词： Mobile computing

来源：评论

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A standard visual courseware authoring tool based on content packaging specification

A standard visual courseware authoring tool based on content...

引用

international conference on information technology - coding and computing

作者： Yang, ZK Zhao, G Wu, D He, JH Huazhong Univ Sci & Technol Dept Elect & Informat Engn Wuhan Peoples R China

ISBN: (纸本)0769521088

Rapid development of E-Learning applications brings large requirements of learning resources, especially web-based courseware. However, the high technical requirement of courseware developers, and low reusability of learning resources heavily impede the process of courseware development. There is an urgent need for courseware authoring system to assist teachers who have no professional knowledge of computer technology to develop standard and reusable web-based coursewares. In this paper we presented such a tool named standard visual courseware authoring tool based content packaging specification. This authoring system has two major features. One is providing visual courseware organization, which achieves the aim that "What you see is what you get". The other one is standardization function based on content Packaging specification for coursewares and inner learning resources. This authoring tool provides a standard way for web-based courseware development.

关键词： visual programming courseware formal specification authoring systems Internet teaching standard visual courseware authoring tool content packaging specification e-learning applications learning resources Web-based courseware courseware development teacher assistance computer technology reusable Web-based coursewares visual courseware organization standardization function

来源：评论

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Grid workflow based on dynamic modeling and scheduling

Grid workflow based on dynamic modeling and scheduling

引用

international conference on information technology - coding and computing

作者： Zhang, SH Gu, N Li, SH Fudan Univ Dept Comp & Informat Technol Shanghai 200433 Peoples R China

ISBN: (纸本)0769521088

Grid is becoming a new infrastructure for scientific computing and cooperative work, it becomes more important and urgent to provide grid workflow to construct and manage the grid applications. The grid workflow based on dynamic modeling and scheduling is presented, which consists of user portal, resource management component, grid services management, performance management, grid workflow engine, and its advantages cover the dynamic modeling according to changing grid running environment and dynamic scheduling adopting to the performance of grid system by performance evaluation and optimization. Then the prototype implemented on the Globus is introduced. Finally the experiments of genome sequencing based on shotgun algorithm are analyzed and the results are promising.

关键词： Natural sciences computing

来源：评论

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Error concealment of transform coded images with continuous QoS

Error concealment of transform coded images with continuous ...

引用

international conference on information technology - coding and computing

作者： Su, X Shang, Y San Jose State Univ Dept Comp Engn San Jose CA 95192 USA Univ Missouri Dept Comp Engn & Sci Columbia MO 65211 USA

ISBN: (纸本)0769521088

Transmission of block-based transform coded images over lossy packet networks is subject to packet losses, causing blocks to be lost or damaged. In this paper we propose a new hybrid error concealment algorithm to achieve continuous QoS in terms of both image quality and reconstruction time. It integrates the dc concealment with the information-restoration scheme, and provides a continuous range of time-quality trade-offs by controlling percentage of the missing blocks to be reconstructed by the dc concealment. Extensive experimental results show that our approach works well for both homogeneous and textured images, and achieves high-quality images in short time.

关键词： Image coding

来源：评论

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A parallel architecture for computing scalar multiplication on Hessian elliptic curves

A parallel architecture for computing scalar multiplication ...

引用

international conference on information technology - coding and computing

作者： Saqib, NA Rodríguez-Henriquez, F Díaz-Pérez, A IPN Ctr Invest & Estudios Avanzados Dept Elect Engn Comp Sci Sect Mexico City 07000 DF Mexico

ISBN: (纸本)0769521088

In this paper a parallel architecture for the computation of Hessian elliptic curve scalar multiplication over binary fields is presented. The architecture was designed as general as possible trying to make no assumptions about the specific hardware platform to be used by the designers. The idea of using parallel strategies was considered in every design stage and implemented as much as hardware resources allowed us to do it so. The design results reported in this work allow us to compute GF(2(191)) elliptic curve scalar multiplication operations in about 114.7mu Secs.

关键词： Cryptography

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Accessing temporal data objects in mobile computing environments

Accessing temporal data objects in mobile computing environm...

引用

international conference on information technology - coding and computing

作者： Wong, ACS Lee, VCS Lam, KW City Univ Hong Kong Dept Comp Sci Hong Kong Hong Kong Peoples R China

ISBN: (纸本)0769521088

In mobile computing environments, many real life applications involve transaction processing with temporal data objects which are updated periodically by external environment. Transaction in temporal database not only has to meet the transaction deadline, but also the data deadline of temporal objects. Traditional concurrency control algorithms used in real-time database are no longer suitable for temporal database. In this paper, a new optimistic concurrency control algorithm, OCC-AVI is devised for processing mobile read-only transactions with the above deadline requirements. Based on the absolute validity interval (AVI) information, read-only transactions at mobile clients can autonomously choose to read a valid value of a temporal object from local cache or pull an updated value from the server. Experimental results show that OCC-AVI can significantly improve the system performance.

关键词： Mobile computing

来源：评论

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Applied fieldbus knowledge for ICT engineers

Applied fieldbus knowledge for ICT engineers

引用

international conference on information technology - coding and computing

作者： Mariño, P Hernández, H Domínguez, MA Poza, F Machado, F Vázquez, F Univ Vigo DTE Galicia Spain

ISBN: (纸本)0769521088

In this paper it is presented the state-of-the-art in fieldbus technology, according with the authors' particular experience, giving diverse points of view about the necessary skills for using development tools and involved electronic devices, currently present in the training market. Given its growing impact all over automotive industry, an introduction about the CAN fieldbus is presented, along with the software and hardware tools that configure training environments for this protocol. Following the two different CAN nodes developed currently by the authors, using the aforementioned tools, are presented. Finally, future developments with great potential in the education of IT engineers, and fieldbus training applied to automotive industry and others, are also mentioned.

关键词： information technology

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Improved rate control for Advanced Video coding (AVC) standard under low delay constraint

Improved rate control for Advanced Video Coding (AVC) standa...

引用

international conference on information technology - coding and computing

作者： Navakitkanok, P Aramvith, S Chulalongkorn Univ Dept Elect Engn Digital Signal Proc Lab Bangkok Thailand

ISBN: (纸本)0769521088

The upcoming H.264/MPEG-4 Advanced Video coding (AVC) video compression standard promises a significant improvement over all previous video compression standards. In this paper, we study the impact of low delay constraint on the rate control algorithm proposed for AVC, and show that the performance of AVC rate control is degraded under such low delay constraint. This results in PSNR degradation and many skipped frames. We then propose an improved rate control scheme to effectively allocate the number of bits and monitor the buffer fullness. Simulation results show that our proposed rate control scheme encodes the video sequences with less frame skipping and with higher PSNR compared to rate control for AVC.

关键词： Image coding

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Adaptation and reuse in designing web information systems

Adaptation and reuse in designing web information systems

引用

international conference on information technology - coding and computing

作者： Frasincar, F Barna, P Houben, GJ Fiala, Z Eindhoven Univ Technol NL-5600 MB Eindhoven Netherlands

ISBN: (纸本)0769521088

The increasing number of requirements for a Web information System asks for an engineered process in designing such a system. In this paper we focus on two of these requirements: presentation adaptation based on user preferences/device capabilities and reusability of the different design artifacts. Hera is a model-based design methodology for Web information Systems. Adaptation and reuse can be tackled at different design levels in Hera. We illustrate by means of examples how adaptation and reuse can be achieved in the conceptual model, the application model, and the presentation model. Based on a static user profile, adaptation is realized by attaching appearance conditions to model elements. With respect to reusability we do focus on one mechanism that supports it, namely inheritance.

关键词： World Wide Web

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A cost-effective critical path approach for service priority optimization in the grid computing economy

A cost-effective critical path approach for service priority...

引用

international conference on information technology - coding and computing

作者： Lin, M Lin, ZX Univ Texas Dept Comp Sci Austin TX 78712 USA

ISBN: (纸本)0769521088

The advancement in the utilization and technologies of the Internet has led to the rapid growth of grid computing;and the perpetuating demand for grid computing resources calls for an incentive-compatible solution to the imminent QoS problem. This paper examines the optimal service priority selection problem that a grid computing network user will confront. We model grid services for a multi-subtask request as a prioritized PERT graph and prove that the localized conditional critical path, which is based on the cost-minimizing priority selection for each node, sets the lower bound for the length of cost-effective critical path that commits the optimal solution. We also propose a heuristic algorithm for relaxing the nodes on the non-critical paths with respect to a given critical path.

关键词： grid computing computing power economy network resource pricing quality of service PERT/CPM time-cost tradeoff

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