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检索条件"任意字段=3rd International Conference on Distributed Computing and Internet Technology, ICDCIT 2006"

共 397 条记录，以下是321-330 订阅

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Performance estimation of overlaid lightpath networks for Lambda users

Performance estimation of overlaid lightpath networks for La...

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3rd international conference on Broadband Communications Networks and Systems

作者： Harai, Hiroaki Tachibana, Takuji Natl Inst Informat & Commun Technol 4-2-1 Nukuikitamachi Koganei Tokyo 1848795 Japan Nara Inst Sci & Technol Nara Japan

ISBN: (纸本)9781424404247

In future, lightpaths will be dynamically provided to users by the use of GMPLS but lightpath networks may be overlaid to the users. When the users want to find idle wavelengths by probing for lightpath provisioning, they may not be able to obtain information about all the idle wavelengths along the route in the overlaid lightpath net-work. They are only allowed to include a limited number of wavelengths for probing. In order to avoid wavelength contention and reduce blocking probability, we present a. method for performance estimation of overlaid lightpath networks from a user side. In this method, we try to find wavelengths that are likely to be idle. This is done by the wavelength based rank accounting for each pair of a source and a destination. Rank is calculated each time a lightpath is provisioned at a pair regardless of the success or failure of the provisioning. We demonstrate that the method of estimation is effective through simulation experiments and also present an initial implementation of a lightpath-provisioning system that uses our performance estimation method based on the GMPLS RSVP-TE mechanism.

关键词： distributed computing Communications technology Bandwidth Application software Electronic mail Computer networks Wavelength division multiplexing Network topology Availability Optical fiber networks

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2006 3rd Annual international conference on Mobile and Ubiquitous Systems, MobiQuitous - Workshops

2006 3rd Annual International Conference on Mobile and Ubiqu...

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2006 3rd Annual international conference on Mobile and Ubiquitous Systems, MobiQuitous

ISBN: (纸本)1424404991

The proceedings contain 73 papers. The topics discussed include: location privacy of users in location-based services;the impact of the context interpretation error on the context prediction accuracy;Pervaho: a development and test platform for mobile ad hoc applications;POISE: an inexpensive, low-power location sensor based on electrostatics;a generic large scale simulator for ubiquitous computing;context-based adaptation of mobile phones using near-field communication;a framework to provide anonymity in reputation systems;SIPCache: a distributed SIP location service for mobile ad-hoc networks;Sleeper: a power-conserving service discovery protocol;adaptive data collection scheme for tracking mobile target in wireless networks;generalized 'yoking-proofs' for a group of RFID tags;context-aware access control;efficient scheduling for sensor network;and metric-based scatternet formation and recovery optimization for Intel Mote.

关键词： internet protocols

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Express risk assessment through web access to simulation data

Express risk assessment through web access to simulation dat...

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3rd international conference on Information technology - New Generations (ITNG)

作者： Smirnov, Andrei Rowan, Steven W Virginia Univ Morgantown WV 26506 USA

ISBN: (纸本)0769524974

A prototype of an express risk assessment system is proposed and implemented as a combination of a distributed simulator and a web interface. A case of aerosol dispersion in an urban environment is investigated. Fast response of the system is achieved by replacing complex 3D simulations with information retrieval from aerosol dispersion database. The database is created by extensive simulations of different aerosol dispersion scenarios. Cluster or grid computing environments are most suitable for these type of simulations. The reduction of system response from a few days to several seconds can be achieved compared to real-time 3D simulations.

关键词： 3D modeling and simulation risk assessment Web interfaces cluster computing information retrieval

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distributed node-based transmission power control for wireless ad hoc networks 1

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3rd international conference on distributed computing and internet technology

作者： Bhattacharjee, Subhasis Das, Nabanita Indian Stat Inst Adv Comp & Microelect Unit Kolkata 700035 W Bengal India

ISBN: (数字)9783540683803

ISBN: (纸本)9783540683797

Transmission power control at individual nodes is used in wireless ad hoc networks for reducing interference and energy consumption. In this paper, two new distributed node-based power control techniques have been proposed to cope up with two different situations, one for lifetime-critical networks with nodes having less mobility, and the other for networks with mobility-prone nodes. The first algorithm is based on the idea of minimum spanning tree (MST) computation. It takes O(n) rounds (n is the total number of nodes), and results better optimization in terms of node power levels. The lower transmission power of nodes makes it suitable for lifespan-critical networks. But O(n) time complexity limits its application to networks. with nodes having high mobility causing frequent topology changes. However, it will be suitable for wireless sensor networks where, after the deployment, nodes become more or less static but lifetime remains to be a critical issue. The second one is based on neighbor pruning scheme that completes transmission power assignment in two rounds of message passing only. Though in terms of the node power levels, the first algorithm performs better, with less computational complexity the second one can easily adapt to the topology changes caused by the mobility of the nodes, and hence is suitable for mobile networks. Simulation studies have been done to compare the performances in terms of different performance metrics.

关键词： Message passing

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SMART: An optical infrastructure for future internet

SMART: An optical infrastructure for future internet

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3rd international conference on Broadband Communications Networks and Systems

作者： Zheng, S. Q. Gumaste, Ashwin Univ Texas Dallas Dept Comp Sci Richardson TX 75083 USA Indian Inst Technol Bombay Maharashtra India

ISBN: (纸本)9781424404247

A new scalable optical network infrastructure SMART is proposed based on light-trails and hypernetwork architecture. The underlying physical network of SMART is a reconfigurable WDM network with reconfigurability distributed over network nodes. The reconfigurable node architecture is capable of dynamically setting up, modifying, and tearing down connections that consist of multi-access hyperchannels, which are an extension of light-trails. Like light-trails, hyperchannels are used to efficiently utilize bandwidth in subwavelength granularity. Hyperchannels and hyperpaths (hybrid connection paths) make SMART scalable. Equipped with a menu of switching techniques and connection types, SMART is able to manage optimized connections, and enforce individual service qualities and overall network performance. SMART network combines the best features of optics and electronics, making the network highly intelligent. Various virtual networks can be easily constructed over SMART. SMART encompasses the best features of existing mature electrical and optical network technologies, making these technologies as special cases. SMART is evolvable with backward compatibility. SMART is customizable for constructing LANs, MANs and WANs, and for access and transport. SMART provides an excellent alternative for the next generation internet.

关键词： internet optical network LAN MAN WAN access network

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Novel approach for remote energy meter reading using mobile agents

Novel approach for remote energy meter reading using mobile ...

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3rd international conference on Information technology - New Generations (ITNG)

作者： Tahboub, Radwan Lazarescu, Vasile Univ Politehn Bucuresti Dept Appl Elect & Informat Technol Iuliu Maniu 1-3 RO-061071 Bucharest Romania

ISBN: (纸本)0769524974

Power or Energy meter systems can be incorporated with embedded controllers such as Micro web-servers with Ethernet port to transmit the reader data over the internet. Such data can be then fed and integrated into existing Energy Management Systems located at power companies and organizations. The problem of efficiently collecting data from a large number of distributed embedded web-servers in the energy meters is still a challenging problem. Mobile Agents are executing programs that migrate during execution and present methods for maintaining and using distributed systems. In this paper, we develop a new abstract approach using Mobile Agents to solve the problem of efficiently collecting meters readings.

关键词： embedded controllers Mobile agents client server Automatic Meter Reading Traveling Salesman

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Removing the barriers to ubiquitous services : A user perspective

Removing the barriers to ubiquitous services : A user perspe...

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3rd Annual international conference on Mobile and Ubiquitous System - Networking and Services

作者： Bush, John Irvine, James Dunlop, John Univ Strathclyde Dept Elect & Elect Engn Glasgow G1 1XQ Lanark Scotland

ISBN: (纸本)9780780397910

An emerging challenge to the realization of ubiquitous, mobile telecommunications is not ostensibly based on any underlying transport or network protocol but on the sheer complexity of technology presented to the user. Common scenarios of future mobile telecommunications often involve multiple devices with varied characteristics and rich and diverse multimedia applications delivered over heterogeneous wireless environments. Most users, however, cannot be expected to appreciate these technologies or participate in its configuration. To address this issue, a user-centric system is proposed that aims to hide complexity from the user. Incorporating concepts of the Personal distributed Environment [1], the proposed system uses a Personal Assistant Agent to interact with, and react to, the environment and a Personal Content Manager to be aware of content types, device capabilities and manage a user's digital content on behalf of the user.

关键词： component ubiquitous services context aware computing heterogeneous access content management

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Webitos: A hard real-time operating system for Ubiquitous computing devices

Webitos: A hard real-time operating system for Ubiquitous Co...

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3rd international conference on Cybernetics and Information Technologies, Systems and Applications/4th international conference on computing, Communications and Control Technologies

作者： Sun, Peigang Zhao, Hai Xu, Jiuqiang Yin, Zhenyu Zhang, Xiyuan Luo, Dingding Ha, Tiejun Northeastern Univ Sch Informat Sci & Engn Shenyang 110004 Liaoning Peoples R China Shenyang Artillery Acad Dept Comp Sci & Technol Shenyang 110162 Liaoning Peoples R China

ISBN: (纸本)9789806560840

At first, the paper analyses Ubiquitous computing technology's challenges to traditional operating systems. Secondly, it introduces research and development in Ubiquitous computing device operating system at home and abroad. Then, it describes the key techniques referred to Webitos, particularly the realization mechanism of Webitos kernel, management mechanism of memory, and reduction of TCP/IP stack. In the end, it tests the performance of Webitos from time cost and space cost required by the kernel, supporting derives access to internet, and so on. According to the metrical results, Webitos has several advantages, such as few resources occupied, high real-time performance and perfect network function, it is believed that Webitos is a real-time, simplified and effective light operating system, especially for embedded development under the Ubiquitous computing environments.

关键词： Ubiquitous computing ubiquitous devices hard real-time preemptive scheduling Best-fit Allocation Algorithm

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An ad hoc adaptive hashing technique for non-uniformly distributed IP address lookup in computer networks

An ad hoc adaptive hashing technique for non-uniformly distr...

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3rd international conference on Cybernetics and Information Technologies, Systems and Applications/4th international conference on computing, Communications and Control Technologies

作者： Martinez, Christopher Lin, Wei-Ming Univ Texas San Antonio Dept Elect Engn San Antonio TX 78249 USA

ISBN: (纸本)9789806560833

Hashing algorithms long have been widely adopted to design a fast address look-up process which involves a search through a large database to find a record associated with a given key. Hashing algorithms involve transforming a key inside each target data to a hash value hoping that the hashing would render the database a uniform distribution with respect to this new hash value. The close the final distribution is to uniform, the less search time would be required when a query is made. When the database is already key-wise uniformly distributed, any regular hashing algorithm, such as bit-extraction, bit-group XOR, etc., would easily lead to a statistically perfect uniform distribution after the hashing. On the other hand, if records in the database are instead not uniformly distributed as in almost all known practical applications, then even different regular hash functions would lead to very different performance. When the target database has a key with a highly skewed distributed value, performance delivered by regular hashing algorithms usually becomes far from desirable. This paper aims at designing a hashing algorithm to achieve the highest probability in leading to a uniformly distributed hash result from a non-uniformly distributed database. An analytical preprocess on the original database is first performed to extract critical information that would significantly benefit the design of a better hashing algorithm. This process includes sorting on the bits of the key to prioritize the use of them in the XOR hashing sequence, or in simple bit extraction, or even a combination of both. Such an ad hoc hash design is critical to adapting to all real-time situations when there exists a changing (and/or expanding) database with an irregular non-uniform distribution. Significant improvement from simulation results is obtained in randomly generated data as well as real data.

关键词： hashing computer networks address lookup packet matching internet intrusion detection network security

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An ant system-based routing algorithm for wireless sensor networks

An ant system-based routing algorithm for wireless sensor ne...

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3rd international conference on Cybernetics and Information Technologies, Systems and Applications/4th international conference on computing, Communications and Control Technologies

作者： Aguilar, Jose Labrador, Miguel A. Univ Los Andes Merida 5201 Venezuela

ISBN: (纸本)9789806560833

In this paper, a general combinatorial Ant System-based distributed algorithm modeled like a dynamic optimization problem is presented. In the proposed algorithm, the solution space of the dynamic combinatorial optimization problem is mapped into the space where the ants will walk, and the transition probability and the pheromone update formula of the ant system are defined according to the objective function of the communication problem. We test and compare the performance of our routing algorithm against well-known routing schemes for wireless sensor networks and via simulations show that it consumes less energy per packet and extends the lifetime of the network.

关键词： dynamic combinatorial optimization distributed routing algorithms wireless sensor networks

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