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International Conference on Distributed Computing systems

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

Path probing is essential to maintain an efficient overlay network topology. However, the cost of complete probing can be as high as O(n/sup 2/), which is prohibitive in large-scale overlay networks. Recently we proposed a method that trades probing overhead for inference accuracy in sparse networks such as the Internet. The method uses physical path information to infer path quality for all of the n/spl times/(n-1) overlay paths, while actually probing only a subset of the paths. We propose and evaluate a distributed approach to implement this method. We describe a minimum diameter, link-stress bounded overlay spanning tree, which is used to collect and disseminate path quality information. All nodes in the tree collaborate to infer the quality of all paths. Simulation results show this approach can achieve a high-level of inference accuracy while reducing probing overhead and balancing link stress on the spanning tree.

关键词： Peer to peer computing Network topology Stress Probes IP networks Routing Bandwidth Delay computerized monitoring software engineering

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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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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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Constraint-guided dynamic reconfiguration in sensor networks

Constraint-guided dynamic reconfiguration in sensor networks

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International Symposium on Information Processing in Sensor Networks (IPSN)

作者： S. Kogekar S. Neema B. Eames X. Koutsoukos A. Ledeczi M. Maroti Institute for Software integrated Systems Department of Electrical Engineering and Computer Science Vanderbilt University Nashville TN USA

This work presents an approach for dynamic software reconfiguration in sensor networks. Our approach utilizes explicit models of the design space of the embedded application. The design space is captured by formally modeling all the software components, their interfaces, and their composition. System requirements are expressed as formal constraints on QoS parameters that are measured at runtime. Reconfiguration is performed by transitioning from one point of the operation space to another based on the constraints. We demonstrate our approach using simulation results for a simple sensor network that performs one-dimensional tracking.

关键词： Intelligent networks Runtime Power system modeling software design Algorithm design and analysis Permission Embedded software software systems Sensor systems Application software

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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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Utilising push and pull mechanism in wireless e-health environment

Utilising push and pull mechanism in wireless e-health envir...

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IEEE International Conference on e-Technology, e-Commerce and e-Service

作者： A.B. Waluyo R. Hsieh D. Taniar W. Rahayu Bala Srinivasan School of Computer Science and Software Engineering Monash University Australia Department of Computer Science and Computer Engineering La Trobe University Australia School of Business Systems Monash University Australia

The emerging of wireless computing motivates radical changes of how information is derived. Our paper concerns with developing push and pull based application in wireless environment. We use a simplified e-health (hospital) context to demonstrate some effective uses of pull-based and push-based mechanisms. The pull mechanism involves information retrieval from a database, and update information in the database. The push mechanism is classified into three scenarios, (i) aperiodic push, (ii) periodic push - global recipients and (iii) periodic push - selective recipients.

关键词： Hospitals Databases Network servers Context computer science Information retrieval Unicast Broadcasting Communication system control software engineering

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Bi-criteria model for locating a semi-desirable facility on a plane using particle swarm optimization

Bi-criteria model for locating a semi-desirable facility on ...

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Congress on Evolutionary Computation

作者： H. Yapicioglu G. Dozier A.E. Smith Department of Industrial and Systems Engineering Aubum University Auburn AL USA Department of Computer Science and Software Engineering Aubum University Auburn AL USA

The problem of locating a semi-desirable facility on a plane is considered. A bi-criteria model is used. One of the criteria is well known minimum criterion. The second criterion is a weighted sum of Euclidean distances raised to the power of negative one. This function represents the aggregate undesirable effects of the facility and it is also a minimization problem. The bi-criteria model consists of a linear combination of these two criteria. The proposed model solved by particle swarm optimization provides better results than a previously proposed heuristic.

关键词： Particle swarm optimization Airports computer industry systems engineering and theory Power generation Costs computer science software engineering Power system modeling Aggregates

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A replicated experiment of usage-based and checklist-based reading

A replicated experiment of usage-based and checklist-based r...

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International Symposium on software Metrics

作者： T. Thelin C. Andersson P. Runeson N. Dzamashvili-Fogelstrom Department of Communication Systems Lund University Lund Sweden Department of Software Engineering and Computer Science Blekinge Institute of Technology Ronneby Sweden

software inspection is an effective method to detect faults in software artefacts. Several empirical studies have been performed on reading techniques, which are used in the individual preparation phase of software inspections. Besides new experiments, replications are needed to increase the body of knowledge in software inspections. We present a replication of an experiment, which compares usage-based and checklist-based reading. The results of the original experiment show that reviewers applying usage-based reading are more efficient and effective in detecting the most critical faults from a user's point of view than reviewers using checklist-based reading. We present the data of the replication together with the original experiment and compares the experiments. The main result of the replication is that it confirms the result of the original experiment. This replication strengthens the evidence that usage-based reading is an efficient reading technique.

关键词： Inspection Fault detection Testing Communication system software computer science software metrics Bioreactors Springs software engineering

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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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