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检索条件"任意字段=5th IEEE International Conference on Distributed Computing in Sensor Systems"

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Audited credential delegation: A sensible approach to grid authentication

Audited credential delegation: A sensible approach to grid a...

引用

ieee international conference on E-Science Workshops

作者： Bruce Beckles Ali N. Haidar Stefan Zasada P.V. Coveney University of Cambridge UK Centre of Computational Science University College London Belgium

If the authentication process in a computational grid environment is difficult for end-users, they will either be unable to use the system at all, or, in their attempts to circumvent the aspects of the authentication process which they find ¿difficult¿, they will probably increase the likelihood of a security compromise of the system. In this paper we examine a proposed authentication architecture, audited credential delegation (ACD), that uses the familiar username/password paradigm to improve the usability (and so the security) of the authentication process in these environments. We report on a usability trial of this architecture in which it is compared to the traditional PKI-based authentication used in many existing computational grid environments. We also discuss how this architecture suggests that computational grid resource providers (and potentially the Certificate Authorities accepted by these providers) need to rethink their ¿one digital certificate = one user¿ security model.

关键词： Authentication Grid computing Usability Security distributed computing Computer architecture Investments Public key conferences Protection

来源：评论

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A distributed k-Anycast Routing Protocol Based on Mobile Agents

A Distributed k-Anycast Routing Protocol Based on Mobile Age...

引用

international conference on Wireless Communications, Networking and Mobile computing (WiCom)

作者： Xin Xu Yun-li Gu Jie Du Huan-yan Qian Institute of Computer & Software Nanjing University of Information Science and Technology Nanjing China School of Computer Science & Technology Nanjing University of Science and Technology of PLA Nanjing China

k-Anycast is a communication paradigm that is proposed to deliver a packet to any threshold k members of a set of communication group hosts. Most k-Anycast routing protocols are centralized and they are not suitable for high dynamic networks (such as wireless sensor networks and wireless ad hoc networks) because they assume that each routing node has global network information. A distributed k-Anycast routing protocol based on mobile agents is proposed in this paper. the protocol forms multiple components and each component has at least k members. Each component can be treated as a virtual server, so k-Anycast service is distributed to each component. In this protocol, mobile agents are applied to initiate or manage components and routing table, so each routing node needn't global network information, only needs to exchange routing information with its neighbors, so the protocol saves much communication cost and adapts to high dynamic networks. Compared to flooding method and centralized k-Anycast routing protocols, performances of the protocol are improved in terms of cost, time delay and scalability.

关键词： Routing protocols Mobile agents Mobile communication Costs Wireless sensor networks Mobile ad hoc networks Network servers Floods Delay effects Scalability

来源：评论

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QoS Performances of ieee 802.11 EDCA and DCF: A Testbed Approach

QoS Performances of IEEE 802.11 EDCA and DCF: A Testbed Appr...

引用

international conference on Wireless Communications, Networking and Mobile computing (WiCom)

作者： Saty Mukherjee Xiao-Hong Peng Qiang Gao School of Engineering & Applied Science Aston University Birmingham UK School of Electronic and Information Engineering Beihang University Beijing China

there has been considerable research into the performance of the enhanced ieee 802.11e standard in recent years. Majority of the performance analysis has been based on simulations and analytical models, with little testing done in a real-world environment. We investigate the behaviors of the enhanced distributed channel access (EDCA) and legacy distributed coordination function (DCF) based on a testbed operating in a realistic working environment. Both TCP/UDP streams representing traffic types such as FTP and VoIP are tested. Quality of service (QoS) metrics such as throughput and delay are calculated directly from a passive capture of the channel. these metrics can also be converted into physical layer requirements such as signal to noise ratio. EDCA and DCF are shown to have similar performances with single streams of traffic, which are contributed directly by the loss effect at the MAC layer.

关键词： Performance evaluation Testing Quality of service Analytical models Performance analysis Traffic control throughput Delay Physical layer Signal to noise ratio

来源：评论

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On-board stereo sensor for intersection driving assistance architecture and specification

On-board stereo sensor for intersection driving assistance a...

引用

ieee international conference on Intelligent Computer Communication and Processing (ICCP)

作者： Sergiu Nedevschi Marita Tiberiu Radu Danescu Florin Oniga Silviu Bota Computer Science Department Technical University of Cluj Napoca Romania

this paper presents the specifications and architecture for a stereovision sensor to be used in intersection assistance. the intersection problem imposes a wide field of view, reasonable accuracy for the typical intersection length, and fast response time. the image and 3D data provided by the low level routines are used to generate two kinds of environment descriptions - an unstructured description, composed of elevation maps, occupancy grids, and polylines delimiting obstacle areas and curbs, and a structured description, composed of lanes, cuboidal objects, and classified pedestrians. the descriptions can be further combined, and additional data sources can be used, in order to provide a complete and accurate description of the intersection.

关键词： Vehicle detection sensor systems Intelligent sensors Road vehicles Computer architecture sensor phenomena and characterization Road accidents Motorcycles sensor fusion Computer science

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Performance Tradeoffs Among Percolation-Based Broadcast Protocols in Wireless sensor Networks

Performance Tradeoffs Among Percolation-Based Broadcast Prot...

引用

international conference on distributed computing systems Workshop

作者： Vijay Raman Indranil Gupta Department of Electrical and Computer Engineering University of Illinois Urbana-Champaign Urbana IL USA Department of Computer Science University of Illinois Urbana-Champaign Urbana IL USA

Broadcast of information in wireless sensor networks is an important operation, e.g., for code updates, queries, membership information, etc. In this paper, we analyze and experimentally compare the performance of vanilla versions of several well-known broadcast mechanisms namely, flooding, site percolation, bond percolation, and modified bond percolation. We carry out our comparison for different network topologies: random, grid, and clustered. Our analysis is performed at the link layer level using a MAC-independent propagation model based on real experiments from the literature. Our main metrics are bandwidth, energy usage, and broadcast latency. Our analytical and experimental results show that, given a desired high reliability for all topologies, flooding and site percolation has the lowest latency; but flooding consumes the most energy per broadcast compared to site percolation. For dense networks, modified bond percolation further lowers energy consumption compared to site percolation, while basic bond percolation leads to a latency increase. For sparse networks, results are similar to a dense network except that site percolation consumes lower energy than modified bond percolation. We briefly discuss implications for different broadcast applications.

关键词： Broadcasting Wireless application protocol Wireless sensor networks Bonding Floods Delay Performance analysis Network topology Bandwidth Energy consumption

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Automatic Mobile Vehicle for Adaptive Real-Time Communication Relay

Automatic Mobile Vehicle for Adaptive Real-Time Communicatio...

引用

international conference on distributed computing systems Workshop

作者： Hai Hu Furong Wang Fan Zhang Weijia Jia Ge Tang Department of Electronics & Information Engineering Huazhong University of Science and Technology Wuhan China Department of Computer Science City University of Hong Kong Hong Kong China State Key Laboratory of Information Engineering in Surveying Mapping and Remote Sensing Wuhan University of China Wuhan China

For the currently popular WiFi networks, the problem of communication blind spots is more acute, since the access points (APs) are not placed according to a central plan. In this paper, we design an Cyber physical system (CPS) based on an automatic mobile vehicle (AMV) to guarantee the quality of service (QoS) of real-time applications in WiFi networks. When a user enters the blind spot regions, the AMV is able to detect the deterioration of the userpsilas service quality and then move automatically to an appropriate position between the user and AP to serve as a multimedia repeater for the user and maintain the communication quality. Technologies in many fields, such as WiFi and sensor detection, are integrated in our system. In WiFi networks, AMV makes use of received signal strength indicator (RSSI) to evaluate the network quality. through configuring many types of sensors, such as acceleration sensors and supersonic sensors, we are able to control the speed and direction of AMV, and effect obstacle avoidance. AMV can intelligently compute the best location to perform relaying based on collected statistics of peripheral sensors. It can also support uninterrupted real-time video transmission.

关键词： Vehicles Mobile communication Relays Intelligent sensors Quality of service Real time systems Repeaters sensor systems Acceleration Computer peripherals

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A graph based backward chaining method for Web service composition

A graph based backward chaining method for Web service compo...

引用

ieee international conference on Intelligent Computer Communication and Processing (ICCP)

作者： Viorica R. Chifu Ioan Salomie Agota Riger Valentin Radoi Department of Computer Science Technical University of Cluj Napoca Cluj-Napoca Romania

this paper proposes a new method for the automatic composition of semantic Web services. the proposed method consists in constructing a graph and then searching for a sub-graph of this graph, which will represent a candidate composition solution. First, the method constructs a directed acyclic graph, which represents the functional semantics of the Web services as well as the semantic dependency between the inputs and the outputs of the services. Second, composition sub-graphs that satisfy the functionality requested by a client are searched for and ranked according to certain criteria such as user preferences and QoS. the different sub-graphs found represent different service compositions. Finally, the method selects the best service composition for a given user request. To evaluate the method, an experimental framework that automatically composes services has been implemented. the effectiveness of the method has been demonstrated by using a scenario from the trip planning domain.

关键词： Web services Semantic Web Automation Computer science Large-scale systems distributed computing Humans Context-aware services Ontologies Cost function

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Performance Analysis of Different Puncturing Schemes for Rate Compatible Block-Type LDPC

Performance Analysis of Different Puncturing Schemes for Rat...

引用

international conference on Wireless Communications, Networking and Mobile computing (WiCom)

作者： Meng Zheng Zesong Fei Jingming Kuang Xiang Chen Wei Sun

the LDPC can provide multiple rates without employing more parity check matrices through the using of Rate Compatible strategy, in which the idea of puncturing is used to get codes at higher rates. this paper mainly focused on Blocktype LDPC, for which three different puncturing algorithms are shown. One is the original scheme of puncturing based on the recovery step. Another one is proposed by directly using the former on Base check matrix. Besides, the idea of puncturing distribution on systematical B-LDPC also performs well. these puncturing schemes are analyzed and compared in the text, and based on the result, new puncturing schemes for B-LDPC in ieee 802.16e standard are proposed.

关键词： Performance analysis Parity check codes Decoding Forward error correction Performance loss Analytical models distributed computing

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Collaborative defense as a pervasive service Architectural insights and validation methodologies of a trial deployment

Collaborative defense as a pervasive service Architectural i...

引用

international conference on Testbeds and Research Infrastructures for the Development of Networks and Communities (TRIDENTCOM)

作者： Eve M. Schooler Carl Livadas Joohwan Kim Prashant Gandhi Pablo R. Passera Jaideep Chandrashekar Steve Orrin Martin Koyabe Fadi El-Moussa Gogobada Daa Dabibi Corporate Technology Intel Corporation Santa Clara CA USA British Telecommunications Public Limited Company Centre for Information Security and Systems Research Ipswich UK

Network defense is an elusive art. the arsenal to defend our devices from attack is constantly lagging behind the latest methods used by attackers to break into them and subsequently into our networks. To counteract this trend, we developed a distributed, scalable approach that harnesses the power of collaborative end-host detectors or sensors. Simulation results reveal order of magnitude improvements over stand-alone detectors in the accuracy of detection (fewer false alarms) and in the quality of detection (the ability to capture stealthy anomalies that would otherwise go undetected). Although these results arise out of a proof of concept in the arena of botnet detection in an enterprise network, they have broader applicability to the area of network self-manageability of pervasive computing devices. To test the efficacy of these ideas further, Intel Corporation partnered with British Telecommunications plc to launch a trial deployment. In this paper, we report on results and insights gleaned from the development of a testbed infrastructure and phased experiments; (1) the design of a re-usable measurement-inference architecture into which 3rd party sensor developers can integrate a wide variety of ldquoanomaly detectionrdquo algorithms to derive the same correlation-related performance benefits; (2) the development of a series of validation methodologies necessitated by the lack of mature tools and approaches to attest to the security of distributed networked systems; (3) the critical role of learning and adaptation algorithms to calibrate a fully-distributed architecture of varied devices in varied contexts, and (4) the utility of large-scale data collections to assess what's normal behavior for Enterprise end-host background traffic as well as malware command-and-control protocols. Finally, we propose collaborative defense as a blueprint for emergent collaborative systems and its measurement-everywhere approach as the adaptive underpinnings needed for pervasive

关键词： Collaboration Detectors Art Pervasive computing Programmable control System testing Algorithm design and analysis Phase measurement Computer architecture sensor systems

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Cognitive Radio Spectrum Sensing Based on Index Belief Degree Function

Cognitive Radio Spectrum Sensing Based on Index Belief Degre...

引用

international conference on Wireless Communications, Networking and Mobile computing (WiCom)

作者： Meng-yun Liu Shi-yin Li Qiong Liu School of Information and Electrical Engineering CUMT Xuzhou Jiangsu China

Nowadays, cognitive radio technology is an intelligent spectrum sharing technology. In order to ensure the licensed users will not be interfered, cognitive(unlicensed) users must be able to detect the spectrum vacancy fast and reliably. For several existing multi-node detection schemes didn't take the test results' reliability of the cognitive users in different locations into consideration, this paper Combines the real environment of wireless communication and proposes an optimized spectrum sensing algorithm based on the index belief degree function after improving on the distributed spectrum sensing algorithm. the simulation results show that the novel algorithm has improved a lot in the detection performance than the existing technology. It has a good anti-jamming performance, a low false alarm probability and a high detection probability, which improves the spectrum utilization rate.

关键词： Cognitive radio Resource management Wireless communication Wireless sensor networks FCC Detection algorithms Signal detection Fading Logic Testing

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