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Advanced Workshop on Content Computing, AWCC 2004

作者： Han, Li-Xin Chen, Gui-Hai Xie, Li Department of Mathematics Nanjing University Nanjing210093 China Department of Computer Science and Engineering Hohai University Nanjing210024 China State Key Laboratory of Novel Software Technology Nanjing University Nanjing210093 China

ISBN: (纸本)3540238980

Because of emergence of Semantic Web, It make possible for machines to understand the meaning of resources on the Web. The widespread availability of machine understandable information will impact on Information retrieval on the web. In this paper, we propose a hybrid web searches architecture, TSS, which combines the traditional search with semantic search to improve precision and recall. The components in TSS are described to support the hybrid web searches. © Springer-Verlag Berlin Heidelberg 2004.

关键词： Information retrieval

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Automated synthesis of multitolerance

Automated synthesis of multitolerance

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International Conference on Dependable systems and Networks (DSN)

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

We concentrate on automated synthesis of multitolerant programs, i.e., programs that tolerate multiple classes of faults and provide a (possibly) different level of fault-tolerance to each class. We consider three levels of fault-tolerance: (1) failsafe, where in the presence of faults, the synthesized program guarantees safety, (2) nonmasking, where in the presence of faults, the synthesized program recovers to states from where its safety and liveness are satisfied, and (3) masking where in the presence of faults the synthesized program satisfies safety and recovers to states from where its safety and liveness are satisfied. We focus on the automated synthesis of finite-state multitolerant programs in high atomicity model where the program can read and write all its variables in an atomic step. We show that if one needs to add failsafe (respectively, nonmasking) fault-tolerance to one class of faults and masking fault-tolerance to another class of faults then such addition can be done in polynomial time in the state space of the fault-intolerant program. However, if one needs to add failsafe fault-tolerance to one class of faults and nonmasking fault-tolerance to another class of faults then the resulting problem is NP-complete. We find this result to be counterintuitive since adding failsafe and nonmasking fault-tolerance to the same class of faults (which is equivalent to adding masking fault-tolerance to that class of faults) can be done in polynomial time, whereas adding failsafe fault-tolerance to one class of faults and nonmasking fault-tolerance to a different class of faults is NP-complete.

关键词： Fault tolerance Safety Fault tolerant systems Network synthesis Polynomials software engineering Laboratories computer science State-space methods engineering profession

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A distributed approach to topology-aware overlay path monitoring

A distributed approach to topology-aware overlay path monito...

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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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Perimorph: run-time composition and state management for adaptive systems

Perimorph: run-time composition and state management for ada...

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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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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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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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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 Method of Acquiring Ontology Information from Web Documents

Lecture Notes in Computer Science (including subseries Lectu...

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Lecture Notes in computer science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) 2004年 3314卷 1041-1046页

作者： Han, Lixin Chen, Guihai Xie, Li Department of Mathematics Nanjing University China State Key Laboratory of Novel Software Technology Nanjing University China Department of Computer Science and Engineering Hohai University China

Ontology plays an important role on the Semantic Web. In this paper, we propose a method, AOIWD, of acquiring ontology information from Web documents. The AOIWD method employs data mining techniques combined with inference engine techniques to develop ontology. One key feature of AOIWD is that it employs association rules and inference mechanism to create association instances of ontology classes. Another key feature of AOIWD is that it employs clustering to create ontology class hierarchy. The method can discover more meaningful relationships and has less human intervention. © Springer-Verlag 2004.

关键词： Ontology

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Approximate caches for packet classification

Approximate caches for packet classification

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IEEE Annual Joint Conference: INFOCOM, IEEE computer and Communications Societies

作者： F. Chang Wu-chang Feng Kang Li Systems Software Laboratory OGI School of Science and Engineering at OHSU Beaverton OR USA Department of Computer Science University of Georgia Athens GA USA

Many network devices such as routers and firewalls employ caches to take advantage of temporal locality of packet headers in order to speed up packet processing decisions. Traditionally, cache designs trade off time and space with the goal of balancing the overall cost and performance of the device. We examine another axis of the design space that has not been previously considered: accuracy. In particular, we quantify the benefits of relaxing the accuracy of the cache on the cost and performance of packet classification caches. Our cache design is based on the popular Bloom filter data structure. This paper provides a model for optimizing Bloom filters for this purpose, as well as extensions to the data structure to support graceful aging, bounded misclassification rates, and multiple binary predicates. Given this, we show that such caches can provide nearly an order of magnitude cost savings at the expense of misclassifying one billionth of packets for IPv6-based caches.

关键词： Filters Costs Aging Data structures Cache storage System software Laboratories Modems Protocols Classification algorithms

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