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JPEG encoder for low-cost FPGAs

JPEG encoder for low-cost FPGAs

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International Conference on computer engineering and systems

作者： Hossam Osman Waseim Mahjoup Azza Nabih Gamal M. Aly Department of Computer and Systems Engineering Ain Shams University Cairo Egypt Software Engineering Competence Center ITIDA Giza Egypt

ISBN: (纸本)1424413656;9781424413652

This paper presents the implementation of a JPEG encoder that exploits minimal usage of FPGA resources. The encoder compresses an image as a stream of 8times8 blocks with each element of the block applied and processed individually. The zigzag unit typically found in implementations of JPEG encoders is eliminated. The division operation of the quantization step is replaced by a combination of multiplication and shift operations. The encoder is implemented on Xilinx Spartan-3 FPGA and is benchmarked against two software implementations on four test images. It is demonstrated that it yields performance of similar quality while requiring very limited FPGA resources. A co-emulation technique is applied to reduce development time and to test and verify the encoder design.

关键词： Field programmable gate arrays Discrete cosine transforms Transform coding Image coding Counting circuits Signal processing Pixel Frequency Streaming media Quantization

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Towards Re-engineering Legacy systems for Assured Dynamic Adaptation

Towards Re-engineering Legacy Systems for Assured Dynamic Ad...

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International Workshop on Modeling in software engineering (MISE)

作者： Ji Zhang Betty H.C. Cheng Software Engineering and Network Systems Laboratory Department of Computer Science and Engineering Michigan State University East Lansing MI USA

Increasingly, software must adapt its behavior in response to changes in the supporting computing, communication infrastructure, and in the surrounding physical environment. Since most existing software was not designed to adapt, research on technique to make legacy software dynamically adaptive has gained increasing interest. Assurance is crucial for adaptive software to fulfill its intended purpose. Correctness is even more critical if it is to be applied in high assurance systems. This paper proposes a model-driven approach to introduce dynamic adaptation to non-adaptive legacy systems while maintaining assurance properties. An aspect-oriented technique is applied to achieve separation of concerns in the implementation.

关键词： software engineering Unified modeling language Adaptive systems Communication system software Physics computing software design software systems Adaptation model Programming computer science

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On discrete event diagnosis methods for continuous systems

On discrete event diagnosis methods for continuous systems

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Mediterranean Conference on Control and Automation (MED)

作者： Matthew Daigle Xenofon Koutsoukos Gautam Biswas Institute for Software Integrated Systems Department of Electrical Engineering and Computer Science Vanderbilt University Nashville TN USA

Fault detection and isolation is a key component of any safety-critical system. Although diagnosis methods based on discrete event systems have been recognized as a promising framework, they cannot be easily applied to systems with complex continuous dynamics. This paper presents a novel approach for discrete event system diagnosis of continuous systems based on a qualitative abstraction of the measurement deviations from the nominal behavior. We systematically derive a diagnosis model, provide diagnosability analysis, and design a diagnoser. Our results show that the proposed approach is easily applicable and can be used for online diagnosis of abrupt faults in continuous systems.

关键词： Continuous time systems Circuit faults Fault diagnosis Discrete event systems Fault detection Computational efficiency Quantization State-space methods Nonlinear dynamical systems software safety

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Authentication in Reprogramming of Sensor Networks for Mote Class Adversaries

Authentication in Reprogramming of Sensor Networks for Mote ...

引用

International Symposium on Parallel and Distributed Processing (IPDPS)

作者： Limin Wang Sandeep S. Kulkarni Software Engineering and Network Systems Laboratory Department of Computer Science and Engineering Michigan State University East Lansing MI USA

Reprogramming is an essential service for wireless sensor networks. Authenticating reprogramming process is important as sensors need to verify that the code image is truly from a trusted source. There are two ways to achieve authentication: public key based and symmetric key based. Although previous work has shown that public key authentication is feasible on sensor nodes if used sparingly, it is still quite expensive compared to symmetric key based approach. In this paper, we propose a symmetric key based protocol for authenticating reprogramming process. Our protocol is based on the secret instantiation algorithm from, which requires only O(log n) keys to be maintained at each sensor. We integrate this algorithm with the existing reprogramming protocol. Through simulation, we show that it is able to authenticate reprogramming process at very low communication cost, and has very short delay.

关键词： Authentication Protocols Base stations Wireless sensor networks Public key Image sensors Costs Delay Testing Elliptic curve cryptography

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Integrated Risk Analysis for a Commercial Computing Service

Integrated Risk Analysis for a Commercial Computing Service

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International Symposium on Parallel and Distributed Processing (IPDPS)

作者： Chee Shin Yeo Rajkumar Buyya Grid Computing and Distributed Systems Laboratory Department of Computer Science and Software Engineering University of Melbourne VIC Australia

Utility computing has been anticipated to be the next generation of computing usage. Users have the freedom to easily switch to any commercial computing service to complete jobs whenever the need arises and simply pay only on usage, without any investment costs. A commercial computing service however has certain objectives or goals that it aims to achieve. In this paper, we identify three essential objectives for a commercial computing service: (i) meet SLA, (ii) maintain reliability, and (iii) earn profit. This leads to the problem of whether a resource management policy implemented in the commercial computing service is able to meet the required objectives or not. So, we also develop two evaluation methods that are simple and intuitive: (i) separate and (ii) integrated risk analysis to analyze the effectiveness of resource management policies in achieving the required objectives. Evaluation results based on five policies successfully demonstrate the applicability of separate and integrated risk analysis to assess policies in terms of the required objectives.

关键词： Risk analysis Resource management Grid computing Distributed computing Switches Maintenance Investments Laboratories computer science software engineering

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Aneka: Next-Generation Enterprise Grid Platform for e-Science and e-Business Applications

Aneka: Next-Generation Enterprise Grid Platform for e-Scienc...

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IEEE International Conference on e-Science and Grid Computing

作者： Xingchen Chu Krishna Nadiminti Chao Jin Srikumar Venugopal Rajkumar Buyya Grid Computing and Distributed Systems (GRIDS) Laboratory Department of Computer Science and Software Engineering University of Melbourne Australia

In this paper, we present the design of Aneka, a .NET based service-oriented platform for desktop grid computing that provides: (i) a configurable service container hosting pluggable services for discovering, scheduling and balancing various types of workloads and (ii) a flexible and extensible framework/API supporting various programming models including threading, batch processing, MPI and dataflow. Users and developers can easily use different programming models and the services provided by the container to run their applications over desktop Grids managed by Aneka. We present the implementation of both the essential and advanced services within the platform. We evaluate the system with applications using the grid task and dataflow models on top of the infrastructure and conclude with some future directions of the current system.

关键词： Grid computing Object oriented modeling Containers Personal communication networks Application software Processor scheduling Data security Peer to peer computing Authentication Resource management

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Fault Diagnosis of Continuous systems Using Discrete-Event Methods

Fault Diagnosis of Continuous Systems Using Discrete-Event M...

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Proceedings of the 46th IEEE Conference on Decision and Control, Pages 5052-5510

作者： Matthew Daigle Xenofon Koutsoukos Gautam Biswas Institute for Software Integrated Systems Department of Electrical Engineering and Computer Science Vanderbilt University Nashville TN USA

ISBN: (纸本)9781424414970;1424414970

Fault diagnosis is crucial for ensuring the safe operation of complex engineering systems. Although discrete-event diagnosis methods are used extensively, they do not easily apply to parametric fault isolation in systems with complex continuous dynamics. This paper presents a novel discrete-event system diagnosis approach for abrupt parametric faults in continuous systems that is based on a qualitative abstraction of measurement deviations from the nominal behavior. Our approach systematically generates a diagnosis model from bond graphs that is used to analyze system diagnosability and derive the discrete-event diagnoser. The proposed approach is applied to an electrical power system diagnostic testbed.

关键词： continuous systems Fault diagnosis diagnostic model Safe handling bond graphs power systems Parametric fault fault isolation

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Preparing Students for software engineering Research

Preparing Students for Software Engineering Research

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Conference on software engineering Education & Training (CSEE&T)

作者： Ita Richardson Lero-the Irish Software Engineering Research Centre and Department of Computer Science and Information Systems University of Limerick Ireland

Discussions of software engineering education tend to focus on the needs of industry and the preparation of graduates for professional careers. This is understandable, and may even be appropriate, but what about those... 详细信息

关键词： software engineering computer science Information systems Programming Birds Feathers computer science education computer industry engineering profession Mathematics

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A Dynamic Critical Path Algorithm for Scheduling Scientific Workflow Applications on Global Grids

A Dynamic Critical Path Algorithm for Scheduling Scientific ...

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IEEE International Conference on e-Science and Grid Computing

作者： Mustafizur Rahman Srikumar Venugopal Rajkumar Buyya Grid Computing and Distributed Systems (GRIDS) Laboratory Department of Computer Science and Software Engineering University of Melbourne Australia

Effective scheduling is a key concern for the execution of performance driven grid applications. In this paper, we propose a dynamic critical path (DCP) based workflow scheduling algorithm that determines efficient mapping of tasks by calculating the critical path in the workflow task graph at every step. It assigns priority to a task in the critical path which is estimated to complete earlier. Using simulation, we have compared the performance of our proposed approach with other existing heuristic and meta-heuristic based scheduling strategies for different type and size of workflows. Our results demonstrate that DCP based approach can generate better schedule for most of the type of workflows irrespective of their size particularly when resource availability changes frequently.

关键词： Heuristic algorithms Scheduling algorithm Dynamic scheduling Processor scheduling Grid computing Application software Availability Electrical capacitance tomography software algorithms Laboratories

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From Limen to Lumen: Computing students in liminal spaces 07

From Limen to Lumen: Computing students in liminal spaces

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3rd International Computing Education Research Workshop, ICER'07

作者： Eckerdal, Anna McCartney, Robert Moström, Jan Erik Sanders, Kate Thomas, Lynda Zander, Carol Department of Information Technology Uppsala University Uppsala Sweden Department of Computer Science and Engineering University of Connecticut Storrs CT United States Department of Computing Science Umeå University 901 87 Umeå Sweden Mathematics and Computer Science Department Rhode Island College Providence RI United States Department of Computer Science University of Wales Aberystwyth Wales Computing and Software Systems University of Washington Bothell Bothell WA United States

ISBN: (纸本)9781595938411

This paper is part of an ongoing series of projects in which we are investigating "threshold concepts": concepts that, among other things, transforms the way a student looks as the discipline and are often troublesome to learn. The word "threshold" might imply that students cross the threshold in a single "aha" moment, but often they seem to take longer. Meyer and Land introduce the term "liminal space" for the transitional period between beginning to learn a concept and fully mastering it. Based on in-depth interviews with graduating seniors, we found that the liminal space can provide a useful metaphor for the concept learning process. In addition to observing the standard features of liminal spaces, we have identified some that may be specific to computing, specifically those relating to levels of abstraction. Copyright 2007 ACM.

关键词： Learning systems

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