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Predicting Change Impact in Architecture Design with Bayesian Belief Networks

Predicting Change Impact in Architecture Design with Bayesia...

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Working IEEE/IFIP Conference on software Architecture

作者： A. Tang Yan Jin Jun Han A. Nicholson Faculty of ICT Swinburne University of Technology Melbourne Australia School of Computer Science and Software Engineering Monash University VIC Australia

Research into design rationale in the past has focused on the representation of reasons and has omitted the connections between design rationales and design artefacts. Without such connections, designers and architects cannot easily assess how changing requirements or designs may affect the system. In this paper, we introduce a model called Architecture Rationale and Element Linkage (AREL) to represent the causal relationship between architecture elements and decisions. We further model AREL as a Bayesian Belief Network (BBN) to capture the probabilistic relationships between architecture elements and decisions in an architecture design model. Such probabilistic modelling enables architects to quantitatively predict and diagnose impact of change when part of the requirements or designs are changing. Using a partial design of a cheque image processing system, we illustrate how AREL is used to represent the decision model and how BBN is used to predict and diagnose change in the architecture design. We use a UML tool to capture the AREL model and a BBN tool to compute the probabilities of change impact.

关键词： Intelligent networks Bayesian methods computer architecture Predictive models computer science software Design engineering Australia Couplings Image processing

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A complex linear feedback shift register design for the A5 keystream generator

A complex linear feedback shift register design for the A5 k...

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National Conference on Radio science (NSRC)

作者： M. Sharaf H.A.K. Mansour H.H. Zayed M.L. Shore Lieutenant Colonel Engineering General Police Communication Faculty of Engineering Banha Branch Zagazig University Egypt Department of Computer Science and Software Engineering Canterbury University New Zealand

A5 encryption/decryption algorithm depends on the use of linear feedback shift registers (LFSR) in order to generate the key-stream bits. The A5-1 algorithm uses three different LFSRs with a majority function to add non-linearity, while A5-2 uses four LFSRs. In this paper a new multi-configurable LFSR design variant of the A5 algorithm is proposed, in which the inverse taps of the LFSR are used to generate the output key-stream bits. The new LFSR design, called a complex LFSR, techniques can be effectively applied in software or hardware to a communications stream to provide a low cost and high speed encryption capability

关键词： Linear feedback shift registers Clocks Flip-flops Shift registers Hardware Costs Vectors Testing computer science software engineering

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On requirements for management of mobile XML Web services and a corresponding management system

On requirements for management of mobile XML Web services an...

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International Conference on Telecommunications in Modern Satellite, Cable and Broadcasting Service (TELSIKS)

作者： V. Tosic H. Lutfiyya Yazhe Tang K. Sherdil A. Dimitrijevic Department of Computer Science University of Western Ontario Canada Department of Software Engineering Lakehead University ONT Canada Department of Software Engineering Xi'an Jiaotong University Ontario Canada Department of Computer Science University of Western Ontario London Ontario Canada Xi''an Jiaotong University China Faculty of Electronic Engineering University of Nis Nis Serbia and Montenegro

Management of mobile/embedded XML Web services has to take into account specifics of their execution environments, including scarce run-time memory, relatively low processing power, limited available electrical power, and slow wireless links. It also has to handle distinctive situations, such as context-sensitive operation and relatively frequent run-time communication disturbances or even disconnections. The existing solutions for management of non-mobile/non-embedded XML Web services do not address these characteristic issues. We have been working on a management system appropriate for mobile/embedded XML Web services. We identified ten new requirements of such a system, additional to the requirements of management systems for non-mobile/non-embedded XML Web services. To address them, we developed new versions of our Web service offerings infrastructure (WSOI) and Web service offerings language (WSOL). Our solutions are being validated on case studies and verified through development of proof-of-concept prototypes.

关键词： XML Web services Power system management Energy management Environmental management Runtime environment Memory management Context Mobile communication Prototypes

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Probability of error of space-time coded OFDM systems with frequency offset in frequency-selective Rayleigh fading channels

Probability of error of space-time coded OFDM systems with f...

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IEEE International Conference on Communications (ICC)

作者： C.R.N. Athaudage K. Sathananthan ARC Special Research Center for Ultra-Broadband Information Networks (CUBIN) University of Melbourne Australia School of Computer Science and Software Engineering Faculty of Information Technology Monash University Australia

In this paper, we analyze the performance of space-time coded (ST-coded) orthogonal frequency division multiplexing (OFDM) systems with carrier frequency offset (CFO) in a frequency-selective Rayleigh fading channel. Closed-form analytical expressions are derived for the symbol error probability (SEP) for M-PSK and M-QAM modulation schemes. The SEP expressions derived are valid and exact for OFDM systems with highly frequency-selective wireless channels where the subcarrier channel responses are i.i.d. with Rayleigh fading. Also, for the case where imperfect channel knowledge is used for space-time decoding, we derive expressions for constellation phase-rotation and post-equalized SINR (signal-to-interference-and-noise ratio) degradation due to CFO. The numerical results demonstrate the sensitivity of the receiver error performance to CFO in ST-coded OFDM systems.

关键词： Fading Performance analysis Error probability OFDM modulation Wireless sensor networks Rayleigh channels Decoding Constellation diagram Signal to noise ratio Degradation

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Low-Complexity Diversity Enhanced OFDM for Wireless Communications

Low-Complexity Diversity Enhanced OFDM for Wireless Communic...

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IEEE Region 10 International Conference TENCON

作者： K. Sathananthan C. R. N. Athaudage School of Computer Science and Software Engineering Faculty of Information Technology Monash University Australia ARC Special Research Center for Ultra-Broadband Information Networks (CUBIN) Department of Electrical and Electronic Engineering University of Melbourne Australia

We propose a low complexity frequency diversity technique for OFDM to improve its error performance in a frequency-selective wireless channel. Recently, linear precoding has been proposed to achieve frequency diversity (multipath diversity) in OFDM, which overcomes the problem of channel nulls (deep fades in frequency-domain). However, currently reported precoding techniques for OFDM have high computational complexity due to associated maximum-likelihood (ML) decoding or pseudo-inverse of large matrices (linear decoding). In the proposed diversity enhanced-OFDM (DE-OFDM), the decoding complexity is minimal as maximum ratio combining (MRC) is incorporated at the receiver to generate a decision variable for each repeatedly transmitted symbol over multiple subcarriers. Moreover, we show that DE-OFDM does not cause any effective data rate (throughput) loss as DE-OFDM using a higher-order modulation scheme (thus the same data rate as conventional OFDM) can provide a better error performance. Both analytical and simulation results are provided to demonstrate the efficiency of DE-OFDM in achieving frequency diversity benefit with low receiver complexity in multipath (frequency-selective) channels. DE-OFDM also outperforms the previously proposed ICI self-cancellation schemes in a frequency-selective fading channel with small frequency offset error.

关键词： Wireless communication Frequency diversity Diversity reception Maximum likelihood decoding Computational complexity Throughput OFDM modulation Performance loss Analytical models Frequency-selective fading channels

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Automated detection of performance regressions: the mono experience

Automated detection of performance regressions: the mono exp...

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International Symposium on Modeling, Analysis and Simulation of computer and Telecommunication Systems (MASCOTS)

作者： T. Kalibera L. Bulej P. Tuma Distributed Systems Research Group Department of Software Engineering Faculty of Mathematics and Physics Charles University Prague Czech Republic Institute of Computer Science Academy of Sciences of Czech Republic Czech Republic

engineering a large software project involves tracking the impact of development and maintenance changes on the software performance. An approach for tracking the impact is regression benchmarking, which involves automated benchmarking and evaluation of performance at regular intervals. Regression benchmarking must tackle the nondeterminism inherent to contemporary computer systems and execution environments and the impact of the nondeterminism on the results. On the example of a fully automated regression benchmarking environment for the mono open-source project, we show how the problems associated with nondeterminism can be tackled using statistical methods.

关键词： MONOS devices Benchmark testing software performance software testing software quality Quality assurance Automatic testing Robustness Performance analysis software engineering

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Applying machine learning using case-based reasoning (CBR) and rule-based reasoning (RBR) approaches to object-oriented application framework documentation

Applying machine learning using case-based reasoning (CBR) a...

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International Conference on Information Technology and Applications, ICITA

作者： H.M. Jani Lee Sai Peck College of Information Technology Universiti Tenaga Malaysia (UNITEN) Kajang Selangor Darul Ehsan Malaysia Department of Software Engineering Faculty of Computer Science and Information Technology University Malaya Kuala Lumpur Malaysia

Several challenges and problems of developing, using and maintaining object-oriented application frameworks have been identified. It was discovered that companies attempting to build or use large-scale reusable framework often fail unless they recognize and resolve challenges such as development effort, learning curve, integratability, maintainability, validation, defect removal, efficiency, and lack of standards. Framework documentation plays a major role in facing the above challenges. It directly affects the learning curve, maintainability, and defect removal aspects of the application frameworks. We have studied various documenting approaches and concluded that the current approaches are not very effective in overcoming the above challenges, especially on the efficiency problem. So, in this paper, we are going to apply machine learning using case-based reasoning (CBR) and rule-based reasoning (RBR) to framework documentation. We come up with a documentation architecture that combines both techniques in order to come up with improved framework documentation.

关键词： Machine learning Documentation Application software Information technology software engineering Java Educational institutions computer science Large scale integration Standards development

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On Development and Evaluation of Prototype Mobile Decision Support for Hospital Triage

On Development and Evaluation of Prototype Mobile Decision S...

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Annual Hawaii International Conference on System sciences (HICSS)

作者： J.S. Pedro F. Burstein J. Wassertheil N. Arora L. Churilov A. Zaslavsky School of Information Management & Systems Monash University Australia Faculty of Medicine Monash University Australia School of Computer Science and Software Engineering Monash University Australia School of Business Systems Monash University Australia

Ambiguous triage scenarios in hospital emergency departments are often difficult to assess without decision support. Subjective assessments of such scenarios can either lead to under-triaging or over-triaging for which true conditions of patients are often not addressed within the required time. In this paper, we propose a decision support model that can guide a clinician when identifying the urgency of medical intervention when patient presents with ambiguous triage case. Our model is a heuristic approach that selects the best triage category, identifies corresponding discriminating attribute of the patient, and allows clinician to attach a level of confidence in the decision. We implemented this model as a mobile decision support system, called iTriage. Results of an initial evaluation of iTriage using fourteen paper-based adult triage scenarios showed that our model produced robust decisions for urgent scenarios. For non-urgent scenarios, the proposed model provided guidance especially when the scenarios were ambiguously stated.

关键词： Prototypes Hospitals Fingers Australia Pain Helium Health information management computer science software engineering Decision support systems

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Dynamic LOD on GPU

Dynamic LOD on GPU

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computer Graphics International

作者： Junfeng Ji Enhua Wu Sheng Li Xuehui Liu Lab. of Comput. Sci. Chinese Acad. of Sci. Beijing China Laboratory of Computer Science Institute of Software Chinese Academy and Sciences Beijing China Faculty of Science and Technology University of Macau Macao China School of Electronics Engineering & Computer Science Peking University Beijing China

ISBN: (纸本)15301052

This paper presents a novel approach to implementing dynamic LOD on GPU. For our purpose, a quadtree structure is created based on seamless geometry image atlas, which is a 3D surface representation in parameter space by combining the features of geometry images and poly-cube maps. All the nodes in the quadtree are packed into the atlas textures. There are two rendering passes in our approach. In the first pass, the LOD selection is performed in the fragment shaders. The resultant buffer is taken as the input texture to the second rendering pass by vertex texturing, and thus the node culling and triangulation can be performed in the vertex shaders. Our LOD algorithm can generate adaptive meshes dynamically, and can be fully implemented on GPU. It improves the efficiency of LOD selection, and alleviates the computing load on CPU.

关键词： Geometry Rendering (computer graphics) Graphics Hardware Pixel Concurrent computing Runtime Mesh generation Digital elevation models Image converters

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A study of service composition with QoS management

A study of service composition with QoS management

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IEEE International Conference on Web Services (ICWS)

作者： C.K. Fung P.C.K. Hung G. Wang R.C. Linger G.H. Walton Engineering and Information Technology Boeing-Phantom Works USA Faculty of Business and Information Technology Institute of Technology University of Ontario Canada Software Engineering Institute Carnegie Mellon University USA Mathematics and Computer Science Department Florida Southern College USA

Quality of service (QoS) management in compositions of services requires careful consideration of QoS characteristics of the services and effective QoS management in their execution. A Web service is a software system that supports interoperable application-to-application interaction over the Internet. Web services are based on a set of XML standards such as simple object access protocol (SOAP). The interactions of SOAP messages between Web services form the theoretical model of SOAP message exchange patterns (MEP). Web Services Business Process Execution Language (WSBPEL) defines an interoperable integration model that facilitates automated process integration in intra- and inter-corporate environments. A service-level agreement (SLA) is a formal contract between a Web services requestor and provider guaranteeing quantifiable issues at defined levels only through mutual concessions. Based on a prior research work on message detail record (MDR), this paper further proposes a SOAP message tracking model for supporting QoS end-to-end management in the context of WSBPEL and SLA. This paper motivates the study of QoS management in a Web service composition framework with the evolution of a distributed toolkit in an industrial setting.

关键词： Quality of service Web services Simple object access protocol Service oriented architecture Quality management Information technology Imaging phantoms software systems Web and internet services Delay

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