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ATEMU: A fine-grained sensor network simulator

ATEMU: A fine-grained sensor network simulator

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2004 First Annual IEEE Communications Society Conference on Sensor and Ad Hoc Communications and networks, IEEE SECON 2004

作者： Polley, Jonathan Blazakis, Dionysys McGee, Jonathan Rusk, Dan Baras, John S. Karir, Manish Department of Electrical and Computer Engineering Institute for Systems Engineering University of Maryland College Park MD 20742 United States Networking Research and Development Merit Network Inc. Ann Arbor MI 48105

ISBN: (纸本)0780387961

In this paper we describe the design and implementation of ATEMU, a fine grained sensor network simulator. ATEMU is intended to bridge the gap between actual sensor network deployments and sensor network simulations. We adopt a hybrid strategy, where the operation of individual sensor nodes is emulated in an instruction by instruction manner, and their interactions with each other via wireless transmissions are simulated in a realistic manner. A unique feature of ATEMU is its ability to simulate a heterogeneous sensor network. Using ATEMU it is possible to not only accurately simulate the operation of different application on the MICA2 platform but also a complete sensor network where the sensor nodes themselves maybe based on different hardware platforms. In addition we also describe our implementation of XATDB, our front-end debugger/GUI for ATEMU. XATDB provides an excellent educational tool for people to start learning about the operation of sensor nodes and sensor networks, without requiring the purchase of actual sensor node hardware. The accuracy and emulation capabilities provided by ATEMU ensure that when and if actual hardware is used, the software will already have undergone rigorous testing and debugging on an accurate platform. This would provide the sensor network deployment community with a much more accurate estimate of the performance of various algorithms and protocols in realistic scenarios and platforms. © 2004 IEEE.

关键词： Telecommunication networks

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TRAP/J: Transparent generation of adaptable java programs

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On the Move to Meaningful Internet systems 2004: International Conference on Cooperative Information systems, CoopIS 2004, International Conference on Distributed Objects and Applications, DOA 2004 and International Conference on Ontologies, Databases and Applications of Semantics, ODBASE 2004

作者： Masoud Sadjadi, S. McKinley, Philip K. Cheng, Betty H. C. Kurt Stirewalt, R.E. School of Computer Science Florida International University MiamiFL33199 United States Software Engineering and Network Systems Laboratory Department of Computer Science and Engineering Michigan State University East LansingMI48824 United States

ISBN: (纸本)3540236627

This paper describes TRAP/J, a software tool that enables new adaptable behavior to be added to existing Java applications transparently (that is, without modifying the application source code and without extending the JVM). The generation process combines behavioral reflection and aspect-oriented programming to achieve this goal. Specifically, TRAP/J enables the developer to select, at compile time, a subset of classes in the existing program that are to be adaptable at run time. TRAP/J then generates specific aspects and reflective classes associated with the selected classes, producing an adapt-ready program. As the program executes, new behavior can be introduced via interfaces to the adaptable classes. A case study is presented in which TRAP/J is used to introduce adaptive behavior to an existing audio-streaming application, enabling it to operate effectively in a lossy wireless network by detecting and responding to changing network conditions. © Springer-Verlag Berlin Heidelberg 2004.

关键词： Quality of service

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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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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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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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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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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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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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Sensors on sea (SOS): a simple novel sensor-based best-effort system for ocean related disaster management

Sensors on sea (SOS): a simple novel sensor-based best-effor...

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International Conference on Intelligent Sensing and Information Processing (ICISIP)

作者： N. Dhyanesh S.V. Raghavan Network Systems Laboratory Department of Computer Science & Engineering Indian Institute of Technology Madras Chennai Tamil Nadu India

Rapid advances in hardware technologies and the ability to build smaller and more powerful computing devices that are capable of networking and sharing information amongst themselves has rendered the large scale production of inexpensive, short-range wireless sensors feasible. Sensor networks have a wide spectrum of applicability, including environmental monitoring, pollution tracking, surveillance, structural fault detection, and design of smart environments. In this paper, we study the applicability of sensors to ocean related disaster management. We present sensors on sea (SOS); a simple, novel, best-effort system for ocean related disaster management using short-range, low-power wireless sensors. SOS strives to progressively and collaboratively build an aggregated global knowledge of sensor measurements, which can be reported to a pick-up station, once a sensor is within transmission range. We have studied the performance of SOS, in terms of the effective number successful feedback one can obtain from a sensor cluster, using a custom developed simulator. Our results are quite encouraging and suggest that the aggregated reports will contain measurements from a high fraction of the sensor cluster, with redundancy, thus reinforcing the applicability of sensors in ocean related disaster management.

关键词： Sensor systems Oceans Intelligent sensors Wireless sensor networks Sea measurements Pollution measurement Hardware Marine technology computer networks Large-scale systems

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