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An integrated environment for reengineering

An integrated environment for reengineering

引用

international conference on Software Maintenance (ICSM)

作者： I. Garcia-Rodriguez de Guzman M. Polo M. Piattini Escuela Superior de Ciencias Experimentales y Tecnologia Universidad Rey Juan Carlos de Madrid Madrid Spain Escuela Superior de Informatica Universidad de Castilla La Mancha Ciudad Real Spain

This paper presents a tool specifically designed for database reengineering. As is well known, reengineering is the process of (1) applying reverse engineering to a software product to get higher-level specifications, and (2) using these specifications as the starting point for the development of a new version of the system. Thus, the complete process can be seen as a sequence of transformation functions that operate on the different sets of artifacts involved in the whole process. The starting point of the reengineering process is the physical schema of the database, which is translated into a vendor-independent metamodel; then, this is translated into a class diagram representing the possible conceptual schema used during the development of the database. This diagram is then taken as the starting point for the code generation process, which produces an executable application for four possible different platforms.

关键词： Reverse engineering Object oriented modeling Erbium Object oriented databases Relational databases Application software Software systems distributed computing Database systems Unified modeling language

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Ultra low-power radio design for wireless sensor networks

Ultra low-power radio design for wireless sensor networks

引用

ieee international Workshop on Radio-Frequency Integration Technology (RFIT)

作者： C. Enz N. Scolari U. Yodprasit Swiss Center for Electronics and Microtechnology Neuchatel Switzerland école Polytechnique Fédérale de Lausanne Lausanne Switzerland

Power consumption and size are the most important challenges faced when designing radios for distributed wireless sensor networks (WSN). Reducing power consumption requires optimization across all the layers of the communication systems. Although the MAC layer plays a crucial role in the overall energy efficiency, the radio remains one of the bottleneck for implementing ultra low-power WSN. The power consumption of the radios available today does not allow for continuous operation and the radio has to be duty-cycled in order to reach the targeted several years autonomy. This clearly has an impact on how to design a radio for WSN. Reducing the node size can be partly achieved by a high level of integration of all the functions required by one node on a single chip. This leads to systems-on-chip (SoC) that are dedicated to WSN. This paper addresses the different issues in the design of ultra low-power WSN with a particular emphasis on the radio. It reviews the constraints imposed on the transceiver design by the low-power and low-voltage specifications, the duty-cycled operation and the modulation scheme. Several radio architectures that can potentially be used for WSN are discussed in the perspective of a CMOS implementation. As examples, the 1st-and 2nd-generation of WiseNET ultra low-power transceivers are presented. The 1st-generation WiseNET transceiver is integrated in a 0.5 /spl mu/m standard digital CMOS process. It operates in the 434 MHz band and consumes only 1 mW from a 1 V supply, while achieving a -95 dBm sensitivity for a 24 kb/s data rate with a 10/sup -3/ BER. The 2nd-generation WiseNET transceiver was designed and specifically optimized for the new WiseMAC protocol specially developed for WSN. It runs from a single 1.5 V battery and operates down to 0.9 V while consuming only 1.8 mW in receive mode. It achieves a -104 dBm sensitivity for 25 kb/s data rate with a 10/sup -3/ BER. In addition to this low-power radio, the 2nd-generation WiseNET system-on

关键词： Wireless sensor networks Transceivers Energy consumption Bit error rate Protocols Frequency synthesizers Phase modulation Energy efficiency CMOS process Design optimization

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Development of characterization of PZT thick films fabricated by an improved sol-gel method

Development of characterization of PZT thick films fabricate...

引用

ieee international conference on Robotics and Biomimetics

作者： Yi-Chu Hsu Kuo-Ching Kuo Ling-Sheng Jang Department of Mechanical Engineering ME Southern Taiwan University of Technology Tainan Taiwan Institute of Micro-Electro-Mechanical-System Engineering IMEMS National Cheng Kung University Tainan Taiwan

The development of next-generation portable MEMS (microelectrical-mechanical systems) call for PZT (lead zirconate titanate oxide) film sensors and actuators with thickness in the range of 1-10 mum. The aim of this project is to fabricate and characterize PZT films with the thickness between 1 and 10 mum by an improved sol-gel method. Two techniques were applied to improve the conventional sol-gel processing: precursor concentration modulation, rapid thermal annealing. Based on the inspection of XRD spectra and SEM, the films of one, two, three, and sixteen coatings from the same sol show the correct crystalline phase. Also the structure and morphology of the synthesized film were dense and crack-free with the thickness between 1 and 10 mum. The characterization methods of the PZT films for the dynamic performance and simulation were developed. The actuation tests demonstrated the silicon cantilever (4 cm times 7 mm times 0.56 mm) could be driven linearly by the PZT film (4 mm times 4 mm times 6.5 mum) at the 1st bending mode of the specimen, 346 Hz, with the amplitude of 240 nm. According to experiments, the frequency of the PZT sensing signal was the same as the driving frequency and the signal strength was proportional to the excitation voltage. This work successfully demonstrates the feasibility of PZT thick films fabricated by the improved sol-gel method

关键词： Thick films Frequency Micromechanical devices Lead compounds Titanium compounds sensor phenomena and characterization sensor systems Thick film sensors Actuators Rapid thermal processing

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Wireless sensor network for aircraft health monitoring

Wireless sensor network for aircraft health monitoring

引用

1st international conference on Broadband Networks

作者： Bai, HW Atiquzzaman, M Lilja, D Haneywell Labs Minneapolis MN 55418 USA

ISBN: (纸本)0769522211

Wireless sensor networks is an emerging paradigm of computing and networking where a node may be self-powered, and have sensing, computing, and communication capabilities. They have been proposed for use in a wide variety of applications. The objective of this article is to describe a wireless sensor network for monitoring of the health of aircraft engines. We describe the architecture of the wireless sensor network along with how it fits into the general area of wireless sensor networks.

关键词： Wireless telecommunication systems

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A scheme for reliable delivery of events in distributed middleware systems

A scheme for reliable delivery of events in distributed midd...

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1st international conference on Autonomic computing

作者： Pallickara, S Fox, G Indiana Univ Community Grids Lab Bloomington IN 47405 USA

Increasingly interactions that services and entities have with each other, and among themselves, are network bound. These interactions can be encapsulated in events. We describe a scheme for the reliable delivery of e... 详细信息

ISBN: (纸本)0780377338

关键词： Middleware

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Emergence: a paradigm for robust and scalable distributed applications

Emergence: a paradigm for robust and scalable distributed ap...

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1st international conference on Autonomic computing

作者： Anthony, RJ Univ Greenwich Dept Comp Sci Sch Comp & Math Sci London SE18 6PF England

ISBN: (纸本)0780377338

Natural distributed systems are adaptive, scalable and fault-tolerant. Emergence science describes how higher-level self-regulatory behaviour arises in natural systems from many participants following simple rule-sets. Emergence advocates simple communication models, autonomy and independence, enhancing robustness and self-stabilization. High-quality distributed applications such as autonomic systems must satisfy the appropriate nonfunctional requirements which include scalability, efficiency, robustness, low-latency and stability. However the traditional design of distributed applications, especially in terms of the communication strategies employed, can introduce compromises between these characteristics. This paper discusses ways in which emergence science can be applied to distributed computing, avoiding some of the compromises associated with traditionally-designed applications. To demonstrate the effectiveness of this paradigm, an emergent election algorithm is described and its performance evaluated The design incorporates non-deterministic behaviour. The resulting algorithm has very low communication complexity, and is simultaneously very stable, scalable and robust.

关键词： emergence distributed systems fault tolerance scalability self-stabilisation election algorithm

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Coverage preserving redundancy elimination in sensor networks

Coverage preserving redundancy elimination in sensor network...

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1st Annual ieee-Communications-Society conference on sensor and Ad Hoc Communications and Networks (SECON 2004)

作者： Carbunar, B Grama, A Vitek, J Carbunar, O Purdue Univ Dept Comp Sci W Lafayette IN 47907 USA

ISBN: (纸本)0780387961

In this paper we study the problem of detecting and eliminating redundancy in a sensor network with a view to improving energy efficiency, while preserving the network's coverage. We also examine the impact of redundancy elimination on the related problem of coverage-boundary detection. We reduce both problems to the computation of Voronoi diagrams, prove and achieve lower bounds on the solution of these problems, and present efficient distributed algorithms for computing and maintaining solutions in cases of sensor failures or insertion of new sensors. We prove the correctness and termination properties of our distributed algorithms, and analytically characterize the time complexity and the traffic generated by our algorithms. Our simulations show that the traffic generated per sensor insertion or removal (failure) experiences a dramatic decrease with increase in sensor density, (up to 300% when the number of sensors deployed in the same 1000 X 1000m(2) area increases from 150 to. 800), and with increase in radio transmission range (up to 200% when the sensor's transmission range increases from 70m to 200m).

关键词： Wireless telecommunication systems

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A fuzzy processor based distributed system for implementing affective human-computer interfaces

A fuzzy processor based distributed system for implementing ...

引用

ieee international conference on systems, Man and Cybernetics

作者： Faro, A Giordano, D Mineo, S Catania Univ Dipartimento Ingn Informat & Telecomun I-95126 Catania Italy

ISBN: (纸本)0780385667

Affective computing has been proposed to enable forms of social interaction between humans and computers by providing computers with the means to recognize human emotions and to enrich their responses with human-like emotions. Among the advantages that are expected from developing computers with affective capabilities is detecting stress conditions of humans involved in system control to activate suitable recovery procedures. Aim of the paper is to propose a prototypical distributed system consisting of two cooperating electronic boards, each provided with the fuzzy processor st52F13 by st Microelectronics, to demonstrate that affective computing may be applied at excellent performances and low costs in all the cases where human behavior has to be monitored to verify that humans are accomplishing a task involving the use of PCs with the needed attention and time-reactions.

关键词： fuzzy logic affective computing human-computer interface

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distributed geo-referenced information accessing and integrating based on mobile agents and GML 4

Distributed geo-referenced information accessing and integra...

引用

4th international conference on Web Information systems Engineering Workshops, WISE 2003

作者： Guan, Jihong Zhou, Shuigeng School of Computer Wuhan University Wuhan430079 China State Key Lab. of Software Engineering Wuhan University Wuhan430079 China Department of Computer Science and Engineering Fudan University Shanghai200433 China

ISBN: (纸本)0769521037

Recent developments of mobile Internet and wireless technologies bring new opportunities and challenges to GIS research and applications. In this paper, we propose a new framework for accessing and integrating distributed geographical information by using mobile agent and GML technologies, in which mobile agents are used to overcome the limitations of traditional distributed computing paradigms in (mobile) Internet context, and GML is used to solve the heterogeneities of various GIS sources. A prototype is implemented, which validates the effectiveness and feasibility of the proposed framework. © 2004 ieee.

关键词： distributed computer systems

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A framework for constraint-based deployment and autonomic management of distributed applications - (Extended abstract)

A framework for constraint-based deployment and autonomic ma...

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1st international conference on Autonomic computing

作者： Dearle, A Kirby, GNC McCarthy, AJ Univ St Andrews Sch Comp Sci St Andrews KY16 9SS Fife Scotland

ISBN: (纸本)0780377338

We propose a framework for the deployment and subsequent autonomic management of component based distributed applications. An initial deployment goal is specified using a declarative constraint language, expressing constraints over aspects such as component-host mappings and component interconnection topology. A constraint solver is used to find a configuration that satisfies the goal, and the configuration is deployed automatically. The deployed application is instrumented to allow subsequent autonomic management. If during execution, the manager detects that the original goal is no longer being met, the satisfy/deploy process can be repeated automatically in order to generate a revised deployment that does meet the goal.

关键词： Computer aided software engineering

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