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Extending metadata with scenarios in adaptive distributed system

Extending metadata with scenarios in adaptive distributed sy...

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3rd international conference on Information Technology and Applications

作者： Wu, YN Zhang, K Wang, XG Tian, JL Tsinghua Univ Dept Comp Sci & Technol Beijing 100084 Peoples R China

ISBN: (纸本)0769523161

The traditional metadata can not provide enough support for the adaptive distributed systems. In this paper, we propose a metadata extension that uses the scenarios as semantic aspect, describing the expected interaction sequence based on XML Schema. With such constraints, resource waste and further damages can be avoided by preventing the illegal interactions at runtime. This extension is more valid and user-friendly than the majority of the existing proposals, avoiding the potential inconsistency. A prototype has been developed to illustrate the applicability of the extended metadata. The experiments demonstrate that the prototype introduces an average overhead ratio of 6.4% in the inter-process interactions and only 0.27% in the remote interactions. The approach presented in this paper is suitable for the adaptive distributed systems and affords more guarantee of reliability.

关键词： distributed computer systems

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PKM: A pairwise key management scheme for wireless sensor networks

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3rd international conference on Computer Networks and Mobile computing (ICCNMC 2005)

作者： An, F Cheng, X Rivera, JM Li, J Cheng, Z Chinese Acad Sci Inst Comp Technol Beijing 100080 Peoples R China George Washington Univ Dept Comp Sci Washington DC 20052 USA USA Washington DC 20310 USA Howard Univ Dept Syst & Comp Sci Washington DC 20059 USA Natl Taxat Bur Rizhao 276826 Shandong Peoples R China

ISBN: (纸本)3540281029

sensor networks are characterized by strict resource limitations and large scalability. Many sensor network applications require secure communication, a crucial component, especially in harsh environments. Symmetric key cryptography is very attractive in sensor networks due to its efficiency, but establishing a shared key for communicating parties is very challenging. The low computational capability and small storage budget within sensors render many popular public-key based key distribution and management mechanisms impractical. In this paper, we propose and analyze a truly in-situ key management scheme for large scale sensor networks, called: Public Key Management (PKM). In this scheme, we deploy service and worker sensors. The service sensors contain a key space, while worker sensors are deployed blind, with no pre-deployment knowledge. Worker sensors obtain security information from service sensors through a secure channel after deployment. After obtaining security information, worker sensors compute shared keys with their neighbors. For security reasons, service sensors erase stored key space information after deployment. During this procedure, PKM shifts a large amount of computational overhead from worker sensors to service sensors, thus conserving worker sensors' resources. PKM's performance, in terms of storage, computational overhead and resiliency, is very good.

关键词： sensor networks security key management key distribution

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A structured peer-to-peer method to discover QoS enhanced alternate paths

A structured peer-to-peer method to discover QoS enhanced al...

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3rd international conference on Information Technology and Applications

作者： Rakotoarivelo, T Senac, P Seneviratne, A Diaz, M Univ New S Wales Kensington NSW 2033 Australia

ISBN: (纸本)0769523161

In the next generation Internet, the network should not only be considered as a communication medium, but also as an endless source of services available to the end-systems. These services (i.e. Overlay Applications) would be composed of multiple cooperative distributed software elements that dynamically build an ad hoc communication mesh (i.e. an Overlay Association). In a previous contribution, we proposed a collaborative distributed method to provide enhanced QoS between end-points within an overlay association. This method aims at discovering and utilizing composite alternate end-lo-endpaths that experience better QoS than the default path given by the IP routing mechanisms. In this paper we present our investigations on a modification to this method. This modification aims at improving its scalability by structuring participating nodes into a coordinate space and by using an alternative scheme to construct the lists of candidate relay nodes for the alternate path discovery method.

关键词： distributed computer systems

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Proceedings of the 3rd Annual international ieee EMBS Special Topic conference on Microtechnologies in Medicine and Biology

Proceedings of the 3rd Annual International IEEE EMBS Specia...

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2005 3rd ieee/EMBS Special Topic conference on Microtechnology in Medicine and Biology

ISBN: (纸本)0780387112

The proceedings contain 127 papers. The topics discussed include: opportunities for microtechnology in ion channel research;insulating dielectrophoresis for the continuous separation and concentration of Bacillus subtilis;multi-DNA extraction chip based on an aluminum oxide membrane integrated into a PDMS microfluidic structure;continuous plasma separation form whole blood using microchannel geometry;improving DNA microarray hybridization with a pulsed source-sink mixing device;microfabricated fluorescence-activated cell sorter with hydrodynamic flow manipulation;dual capillary electrophoresis devices with electrochemical detection on a single platform;lab-on-a-chip systems with three dimensional microelectrodes;open environment micro device for integration of patch clamp instrumentation with targeted microfluidic chemical delivery;influence of oxygen microenvironment on microfluidic glucose sensor performance;and a PDMS microfluidic spotter for fabrication of lipid microarrays.

关键词： Medicine

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Fireflyinspired sensor network synchronicity with realistic radio effects 05

Fireflyinspired sensor network synchronicity with realistic ...

引用

3rd ACM international conference on Embedded Networked sensor systems, SenSys 2005

作者： Wernerallen, Geoffrey Tewari, Geetika Patel, Ankit Welsh, Matt Nagpal, Radhika Division of Engineering and Applied Sciences Harvard University United States

ISBN: (纸本)159593054X

Synchronicity is a useful abstraction in many sensor network applications. Communication scheduling, coordinated duty cycling, and time synchronization can make use of a synchronicity primitive that achieves a tight alignment of individual nodes' firing phases. In this paper we present the Reachback Firefly Algorithm (RFA), a decentralized synchronicity algorithm implemented on TinyOS-based motes. Our algorithm is based on a mathematical model that describes how fireflies and neurons spontaneously synchronize. Previous work has assumed idealized nodes and not considered realistic effects of sensor network communication, such as message delays and loss. Our algorithm accounts for these effects by allowing nodes to use delayed information from the past to adjust the future firing phase. We present an evaluation of RFA that proceeds on three fronts. First, we prove the convergence of our algorithm in simple cases and predict the effect of parameter choices. Second, we leverage the TinyOS simulator to investigate the effects of varying parameter choice and network topology. Finally, we present results obtained on an indoor sensor network testbed demonstrating that our algorithm can synchronize sensor network devices to within 100 μsec on a real multi-hop topology with links of varying quality. Categories and Subject Descriptors C.2 [Computer-Communication Networks]: Network Architecture and Design, distributed systems General Terms Algorithms, Design, Experimentation, Theory. © 2005 ACM.

关键词： Network architecture

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On the performance analysis of multiple access codes for ultra-wideband sensor networks

On the performance analysis of multiple access codes for ult...

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ITI 3rd international conference on Information and Communications Technology, ICICT 2005 - Enabling Technologies for the New Knowledge Society

作者： Nabi, Javaid Bose, Ranjan Haus Khas New Delhi - 110016 India

ISBN: (纸本)0780392701

Ultra Wideband (UWB) technology is fast emerging as a potential contender for next generation wireless sensor networks because of the inherent low power requirements and built in security. Time hopping and direct sequence based spread spectrum techniques are employed for UWB multiple access systems, which makes the correlation properties of these techniques a critical issue in a multi-user (multiple nodes) scenario. In this paper we present a comparative performance analysis of different spreading codes namely, PN, Gold and Kasami using PPM and PAM modulation schemes over AWGN and ieee 802.15.3a channel models. We use a PRake receiver for multipath channel. We observe that DS spreading technique is more suitable than TH for multi-user systems. Simulation results show that Kasami codes perform better than Gold and PN codes for all considered cases. However, Kasami codes can accommodate less number of nodes for a given code length due to their reduced set size. Thus, for small sensor networks Kasami codes should be deployed, where as for larger sensor networks Gold and PN codes are more suitable.

关键词： Codes (symbols)

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A key management scheme for cross-layering designs in wireless sensor networks

A key management scheme for cross-layering designs in wirele...

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3rd international conference on Parallel and distributed Processing and Applications

作者： Yu, B Chen, HG Yang, M Mao, DL Gao, CS Fudan Univ Dept Comp Sci & Engn Shanghai 200433 Peoples R China

ISBN: (纸本)3540297693

The current wireless sensor network designs are largely based on a layered approach. The suboptimality and inflexibility of this paradigm result in poor performance, due to constraints of power, communication, and computational capabilities. Key management plays an important role in wireless sensor networks, because it not only takes charge of securing link-layer communications between nodes, but also has great effects on other protocol layers, e.g. routing and IDS (Intrusion Detection System). However, no existing key management protocols have attached enough importance to cross-layering designs. In this paper, we propose a cross-layering key management scheme, which can provide other protocol layers with a nice trust-level metric. The trust-level metric is generated during the pairwise key establishment phase, and it varies as system conditions change. This metric describes the security level between two neighboring nodes and helps other protocol layers to make decisions. We also present simulations and analysis to show the superior characteristics of our scheme against both passive attacks and active attacks.

关键词： Mobile computing

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Performance modeling and analysis of object oriented distributed software systems: A necessary step toward software performance stability

Performance modeling and analysis of object oriented distrib...

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ACS/ieee international conference on Computer systems and Applications

作者： R. Ammar A. Abdel-raouf T.A. Fergany Computer Sc. and Engineering Department University of Connecticut Storrs CT USA Computer Sc. Department University of New Haven West Haven CT USA

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A prediction-based location update algorithm in wireless mobile ad-hoc networks

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3rd international conference on Computer Networks and Mobile computing (ICCNMC 2005)

作者： Shen, J Yang, K Zhong, SC Univ Essex Dept Elect Syst Engn Colchester CO4 3SQ Essex England Beijing Inst Technol Dept Comp Sci Beijing 100081 Peoples R China NE Normal Univ Sch Software Changchun Peoples R China

ISBN: (纸本)3540281029

Location information in Mobile Ad Hoc Networks (MANETs) provides efficiency to uni-cast and multi-cast algorithms. This paper proposes a new location update algorithm called PLU. The essence of PLU lies in the integration of location prediction and one-hop broadcasting of location update packets. The full PLU algorithm and its associated data structure are described in the paper. The simulation results have shown an improved performance of PLU thanks to its newly introduced type of updates where location prediction is applied to reduce the number of packets or bytes transmitted for location update purpose whereas keeping a high accuracy level of location information.

关键词： Telecommunication networks

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A unifying link abstraction for wireless sensor networks 05

A unifying link abstraction for wireless sensor networks

引用

3rd ACM international conference on Embedded Networked sensor systems, SenSys 2005

作者： Polastre, Joseph Hui, Jonathan Levis, Philip Zhao, Jerry Culler, David Shenker, Scott Stoica, Ion Computer Science Department University of California Berkeley CA 94720 United States International Computer Science Institute 1947 Center Street. Suite 600 Berkeley CA 94704 United States

ISBN: (纸本)159593054X

Recent technological advances and the continuing quest for greater efficiency have led to an explosion of link and network protocols for wireless sensor networks. These protocols embody very different assumptions about network stack composition and, as such, have limited interoperability. It has been suggested [3] that, in principle, wireless sensor networks would benefit from a unifying abstraction (or "narrow waist" in architectural terms), and that this abstraction should be closer to the link level than the network level. This paper takes that vague principle and turns it into practice, by proposing a specific unifying sensornet protocol (SP) that provides shared neighbor management and a message pool. The two goals of a unifying abstraction are generality and efficiency: it should be capable of running over a broad range of link-layer technologies and supporting a wide variety of network protocols, and doing so should not lead to a significant loss of efficiency. To investigate the extent to which SP meets these goals, we implemented SP (in TinyOS) on top of two very different radio technologies: B-MAC on mica2 and ieee 802.15.4 on Telos. We also built a variety of network protocols on SP, including examples of collection routing [53], dissemination [26], and aggregation [33]. Measurements show that these protocols do not sacrifice performance through the use of our SP abstraction. Categories and Subject Descriptors: C.2.2 [Computer-Communication Networks] Network Protocols, D.4.7 [Operating systems]: Organization and Design General Terms: Design, Experimentation, Standardization. © 2005 ACM.

关键词： Wireless sensor networks

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