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International Conference on Distributed Computing systems Workshop

作者： E.P. Kasten P.K. McKinley Software Engineering and Network Systems Laboratory Department of Computer Science and Engineering Michigan State University East Lansing MI USA

We address a key issue that arises in run-time recomposition of software: the transfer of nontransient state between old components and their replacements. We focus on the concept of collateral change, which refers to the set of recomposition actions that must be applied atomically for continued correct execution of the system. We describe Perimorph, a system that supports compositional adaptation of both functional and nonfunctional concerns by explicitly addressing collateral change. The operation of Perimorph is demonstrated through the implementation and testing of a 2D/3D digital elevation mapping application that supports recomposition and handoff among networked devices with varying capabilities.

关键词： Runtime Adaptive systems Application software Distributed computing Fault tolerance software engineering Laboratories computer science Testing Middleware

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On quality-of-service and energy consumption tradeoffs in FEC-encoded audio streaming

On quality-of-service and energy consumption tradeoffs in FE...

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International Workshop on quality of Service

作者： Z. Zhou P.K. McKinley S.M. Sadjadi Software Engineering and Network Systems Laboratory Department of Computer Science and Engineering Michigan State University East Lansing MI USA

This paper addresses the energy consumption of forward error correction (FEC) protocols as used to improve quality-of-service (QoS) for wireless computing devices. The paper also characterizes the effect on energy consumption and QoS of the power saving mode in 802.11 wireless local area networks (WLANs). Experiments are described in which FEC-encoded audio streams are multicast to mobile computers across a WLAN. Results of these experiments quantify the tradeoffs between improved QoS, due to FEC, and additional energy consumption caused by receiving and decoding redundant packets. Two different approaches to FEC are compared relative to these metrics. The results of this study enable the development of adaptive software mechanisms that attempt to manage these tradeoffs in the presence of highly dynamic wireless environments.

关键词： quality of service Energy consumption Streaming media Forward error correction Wireless LAN Wireless application protocol Mobile computing Decoding Environmental management software development management

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Automated analysis of timing information in UML diagrams 04

Automated analysis of timing information in UML diagrams

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IEEE International Conference on Automated software engineering (ASE)

作者： S. Konrad L.A. Campbell B.H.C. Cheng Software Engineering and Network Systems Laboratory Department of Computer Science and Engineering Michigan State University East Lansing MI USA

ISBN: (纸本)9780769521312

This work introduces an approach to adding timing information to UML diagrams for modeling embedded systems. In order to perform automated formal analysis of these UML diagrams with timing information, we extend a previously developed UML formalization framework to provide Promela semantics for the timing elements of the UML diagrams. The paper describes the application of our approach to an electronically controlled steering system obtained from one of our industrial collaborators.

关键词： Information analysis Timing Unified modeling language Embedded system Performance analysis Automatic control Control systems Steering systems Electrical equipment industry Electronics industry

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Transparent self-optimization in existing CORBA applications

Transparent self-optimization in existing CORBA applications

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International Conference on Autonomic Computing (ICAC)

作者： S.M. Sadjadi P.K. McKinley Software Engineering and Network Systems Laboratory Department of Computer Science and Engineering Michigan State University East Lansing MI USA

This paper addresses the design of adaptive middleware to support autonomic computing in pervasive computing environments. The particular problem we address here is how to support self-optimization to changing network connection capabilities as a mobile user interacts with heterogeneous elements in a wireless network infrastructure. The goal is to enable self-optimization to such changes transparently with respect to the core application code. We propose a solution based on the use of the generic proxy, which is a specific CORBA object that can intercept and process any CORBA request using rules and actions that can be introduced to the knowledge base of the proxy during execution. To explore its design and operation, we have incorporated the generic proxy into ACT (Sadjadi and McKinley, 2004), an adaptive middleware framework we designed previously to support adaptation in CORBA applications. Details of the generic proxy are presented. A case study is described in which a generic proxy is used to support self-optimization in an existing image retrieval application, when executed in a heterogeneous wireless environment.

关键词： Middleware Communication system security computer networks Pervasive computing Wireless networks Military computing Intelligent networks Application software software engineering computer science

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Generation of self-optimizing wireless network applications

Generation of self-optimizing wireless network applications

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International Conference on Autonomic Computing (ICAC)

作者： S.M. Sadjadi P.K. McKinley R.E.K. Stirewalt B.H.C. Cheng Software Engineering and Network Systems Laboratory Department of Computer Science and Engineering Michigan State University East Lansing MI USA

Adaptable applications are difficult to develop and maintain especially if adaptive code, which implements the adaptive behavior, is tangled into functional code, which implements the imperative behavior. Our work investigates how to wrap existing applications transparently to generate such management components. Developing manageable components requires some mechanism to support adaptation in behavior. The predominant mechanism for implementing adaptation in object-oriented software is behavioral reflection, which can be used to modify how an object responds to a message. This work describes the application of TRAP/J to a multicast audio application. The audio-streaming application (ASA) is designed to deliver interactive audio from a microphone at one network node to multiple receiving nodes.

关键词： Wireless networks Reflection Application software quality of service Adaptive coding Wireless LAN software engineering Laboratories computer science Environmental management

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A component-based programming model for autonomic applications

A component-based programming model for autonomic applicatio...

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International Conference on Autonomic Computing (ICAC)

作者： Hua Liu M. Parashar S. Hariri The Applied Software Systems Laboratory Department of Electrical and Computer Engineering Rutgers University Piscataway NJ USA Department of Electrical and Computer Engineering University of Arizona Tucson AZ USA

The emergence of pervasive wide-area distributed computing environments, such as pervasive information systems and computational grids, has enabled new generations of applications that are based on seamless access, aggregation and interaction. However, the inherent complexity, heterogeneity and dynamism of these systems require a change in how the applications are developed and managed. In this paper we present a component-based programming framework to support the development of autonomic self-managed applications. The framework enables the development of autonomic components and the formulation of autonomic applications as the dynamic composition and management of autonomic components. The operation of the proposed framework is illustrated using a forest fire application.

关键词： Grid computing Distributed computing Pervasive computing Crisis management Application software Management information systems Mesh generation Disaster management Programming profession Fires

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An authorization model for multimedia digital libraries

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International Journal on Digital Libraries 2004年第3期4卷 139-155页

作者： Kodali, Naren Farkas, Csilla Wijesekera, Duminda Department of Information and Software Engineering George Mason University Fairfax VA 22030-4444 United States Center for Secure Information Systems George Mason University Fairfax VA 22030-4444 United States Information Security Laboratory University of South Carolina Columbia SC 29208 United States Department of Computer Science and Engineering University of South Carolina Columbia SC 29208 United States

In this paper we present a generalized authorization model for multimedia digital libraries. Our aim is to support the enforcement of access control requirements of the original data sources without the need to create a new, unified model for the digital library. We integrate the three most widely used access control models (i.e., mandatory, discretionary, and role-based) within a single framework, allowing seamless accesses to data protected by these security models. In particular, we address the access control needs of continuous media data while supporting quality of service (QoS) requirements and preserving operational semantics. The technical core of the paper focuses on the development of metadata and the corresponding metastructure to represent authorization policies and QoS requirements and shows their applicabilty to continuous media. We define our security objects based on the Synchronized Multimedia Integration Language (SMIL), which controls multimedia presentations. Following the synchronization constructs 〈par〉 and 〈seq〉 of SMIL, we define a normal form for multimedia streams, called SMIL normal form. SMIL normal form provides a syntax-independent representation of semantically equivalent multimedia data. SMIL normal form compositions are extended (decorated) with RDF statements, representing security and QoS metadata. Interpretation of these statements and, therefore, the authorization and QoS requirements of the decorated multimedia object are defined by the metastructure, represented as a DAML+OIL ontology. We propose the concept of generalized subject that encompasses all access permissions of a given user regardless of the multiple permissions in different access control models. Finally, we develop methods to generate secure views for each generalized subject and retrieve them using a secure multimedia server. © Springer-Verlag 2004.

关键词： Access control Continuous media Digital library Metadata Semantics

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A software for voltage sags strategic studies

A software for voltage sags strategic studies

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2004 11th International Conference on Harmonics and quality of Power

作者： Carvalho Filho, José Maria Abreu, José Policarpo Gonçalves Clé Oliveira, Thiago Carpinteiro, Otávio Augusto Salgado Rosa Jr., Carlos Bernardes Oliveira, Fábio Auguste Gomes, Rogério Prina Carvalho, Sylvia G. Do Nascimento Gonçalves, David Power Quality Study Group Institute of Electrical Systems and Energy Itajubá Federal University P.O. Box 50 37500-000 Itajubá-MG Brazil Research Group on Computer Networks and Software Engineering Itajubá Federal Univeristy Brazil Light Serviços de Eletricidade S.A. Rio de Janeiro Brazil

This paper describes a software specially developed for strategic studies within Power quality, more specifically Voltage Sags. First, the methodology to estimate the number and the characteristics of the disturbances... 详细信息

ISBN: (纸本)0780387465

关键词： Electric potential

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Modular monadic program slicing

Modular monadic program slicing

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IEEE Annual International computer software and Applications Conference (COMPSAC)

作者： Yingzhou Zhang Baowen Xu Liang Shi Bixin Li Hongji Yang Department of Computer Science and Engineering South-East University Nanjing China Jiangsu Institute of Software Quality Nanjing China State Key Laboratory of Software Engineering Wuhan University of China Wuhan China School of computing De Montfort University UK

ISBN: (纸本)0769522092

Program slicing is widely used in applications such as program comprehension, software testing, debugging, measurement, and reengineering. This paper proposes a new approach for program slicing, called modular monadic slicing, basing on modular monadic semantics of the program analysed. We abstract the computation of program slicing as a language-independence entity: slice monad transformer. On the basis of this, we present and illustrate modular monadic dynamic and static slice algorithms in detail. We conclude that modular monadic slicing has excellent flexibility and reusability properties comparing with the existing program slicing algorithms. It computes program slices on abstract syntax directly without intermediate structures such as dependence graphs

关键词： Application software computer science software testing Debugging software measurement software quality Laboratories software engineering computer science education Educational programs

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A framework for Web applications testing

A framework for Web applications testing

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International Conference on Cyberworlds

作者： Lei Xu Baowen Xu Department of Computer Science & Engineering Jiangsu Institute of Software Quality South-East University Nanjing China State Key Laboratory of Software Engineering Wuhan University of China Wuhan China School of Computers National University of Defense Technology Changsha China

ISBN: (纸本)0769521401

Web application testing is concerned with numerous and complicated testing objects, methods and processes. So a testing framework fitting for the properties of Web application is needed to guide and organize all the testing tasks. Based on the analysis for Web application characters and traditional software testing process, the process for Web application testing is modeled, which describes a series of testing flows such as the testing requirement analysis, test cases generation and selection, testing execution, and testing results analysis and measurement. Furthermore, the realization techniques are also investigated so as to integrate each testing step and implement the whole testing process harmoniously and effectively. Thus the framework is suitable for the Internet environment and can guide the Web application testing actively and availably.

关键词： Testing

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