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检索条件"机构=Lab. of Computer Networks and Distributed Systems"

共 107 条记录，以下是41-50 订阅

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Magnetically induced simultaneous slow and fast light by phase control

Magnetically induced simultaneous slow and fast light by pha...

引用

Slow and Fast Light, Slow_Fast 2011

作者： Luo, Bin Guo, Hong CREAM Group State Key Lab. of Advanced Optical Communication Systems and Networks Inst. of Quantum Electronics School of Electronics Engineering and Computer Science Peking University Beijing 100871 China

A-type atom coupled by additional driving light and radio frequency (RF) field can generate controllab.e simultaneous slow and fast light at two frequencies. Distortions by radiative dampings are discussed and compens... 详细信息

ISBN: (纸本)9781557529138

关键词： Slow light

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An efficient partial link monitoring scheme for inter-domain routing under dynamic traffic scenarios

An efficient partial link monitoring scheme for inter-domain...

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作者： Zhang, Pengfei Jin, Yaohui Sun, Weiqiang Guo, Wei Hu, Weisheng Ghani, N. State Key Lab. of Advanced Communication Systems and Networks Shanghai Jiao Tong University China Electrical and Computer Engineering Department University of New Mexico United States

We investigate link-state advertising in multi-domain networks with dynamic traffic. A novel triggering scheme is proposed to monitor a subset of domain links, and thereby achieve a balance between salab.lity and accu... 详细信息

ISBN: (纸本)9781457702136

关键词： Optical fibers

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Wideband compressed sensing for cognitive radios

Wideband compressed sensing for cognitive radios

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2011 IEEE Military Communications Conference, MILCOM 2011

作者： Ayhan Sakarya, F. Nagel, George S. Tran, Lan H. Molnar, Joseph A. Networks and Communications Systems Branch Information Technology Division Naval Research Lab. Washington DC United States School of Electrical and Computer Engineering College of Engineering Georgia Institute of Technology Atlanta GA United States

ISBN: (纸本)9781467300810

Efficient utilization of spectral bands in a dynamic environment with a continuously changing occupation rate is challenging. Static spectral allocations preclude the use of unoccupied spectrum, unless the spectrum manager has released the allocation to another mission. Standard spectral sensing techniques employ swept narrowband receivers. While effective in creating a composite, these techniques are ineffective at identifying short duration signals. Real-time spectral analysis techniques are effective at capturing short duration transmissions, but usually have narrow band capabilities, limited dynamic range and are relatively expensive. Timely accurate sensing of wide spectral band using traditional spectral estimations at the Nyquist rate (or higher) is another challenge due to the high data rate. Compressed sensing (CS) techniques utilize signal-to-information rate processing when signals are sparse in a specific domain. Dynamic spectrum access (often considered a critical component of a cognitive radio (CR)) can reutilize temporally unoccupied spectrum. An accurate estimate of the current state of spectral occupancy is critical to the autonomous decision processes involved in dynamic spectrum access. From this perspective, CS is being studied as an enhancement to dynamic spectrum access strategies. This study addresses feasibility issues for the development of autonomous CS-CR systems that are capable of performing spectrum sensing and recovery without a priori information about the spectral occupancy. Since recovery requires computationally intense non-linear optimization, we perform a single platform trade study on CS methodologies (BP-PD, BP-SPG, ROMP, Edge Detection, and Sequential Recovery) for efficient wideband recovery relative to execution time and reconstruction error. We propose adaptive coarse detection, and exact recovery based on adaptive edge detection. We present the results using continuous waves and pulses (MATlab.or GRC generated, or USRP mea

关键词： Cognitive radio

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A comparison of Wireless Fidelity (Wi-Fi) fingerprinting techniques

A comparison of Wireless Fidelity (Wi-Fi) fingerprinting tec...

引用

International Conference on Information and Communication Technology Convergence (ICTC)

作者： Lersan B. Del Mundo Rafael Lean D. Ansay Cedric Angelo M. Festin Roel M. Ocampo Networks and Distributed Systems Laboratory Department of Computer Science University of the Philippines Diliman Quezon Philippines Computer Networks Lab Electrical and Electronics Engineering Institute University of the Philippines Diliman Quezon Philippines

Among several techniques proposed for indoor positioning using IEEE 802.11 Wireless Fidelity (Wi-Fi) based networks, those that rely on fingerprinting have been demonstrated to outperform those based on lateration, angulation, and cell of origin in terms of accuracy. We compare and evaluate three Wi-Fi fingerprinting techniques that use the K-Nearest Neighbor (k-NN), Naive Bayes Classifier (NBC) and Support Vector Machine (SVM) algorithms. Our experiments show that SVM-based fingerprinting outperformed both k-NN and NBC-based fingerprinting, achieving accuracies of 2 meters or better within our testbed.

关键词： Accuracy Support vector machines IEEE 802.11 Standards Vectors Databases Fingerprint recognition Kernel

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The memory effect and its implications on Web QoE modeling

The memory effect and its implications on Web QoE modeling

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2011 23rd International Teletraffic Congress, ITC 2011

作者： Hoßfeld, Tobias Biedermann, Sebastian Schatz, Raimund Platzer, Alexander Egger, Sebastian Fiedler, Markus University of Würzburg Institute of Computer Science Department of Communication Networks D-97074 Würzburg Germany Telecommunications Research Center Vienna - Ftw A-1220 Vienna Austria Blekinge Institute of Technology Communication and Computer Systems Research Lab. SE-371 79 Karlskrona Sweden Technische Universität Darmstadt Germany

ISBN: (纸本)9780983628309

Quality of Experience (QoE) has gained enormous attention during the recent years. So far, most of the existing QoE research has focused on audio and video streaming applications, although HTTP traffic carries the majority of traffic in the residential broadband Internet. However, existing QoE models for this domain do not consider temporal dynamics or historical experiences of the user's satisfaction while consuming a certain service. This psychological influence factor of past experience is referred to as the memory effect. The first contribution of this paper is the identification of the memory effect as a key influence factor for Web QoE modeling based on subjective user studies. As second contribution, three different QoE models are proposed which consider the implications of the memory effect and imply the required extensions of the basic models. The proposed Web QoE models are described with a) support vector machines, b) iterative exponential regressions, and c) two-dimensional hidden Markov models. © 2011 ITC.

关键词： Hidden Markov models

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Improving range query performance on historic web page data

Improving range query performance on historic web page data

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5th Annual ChinaGrid Conference, ChinaGrid 2010

作者： Li, Geng Peng, Bo Lab. of Computer Networks and Distributed Systems Peking University Beijing China

ISBN: (纸本)9780769541068

This paper is about the performance of range queries on historic web page data set, i.e. requests into a data set of web pages that keeps record of historic versions of HTML data of URLs on the web for a subset of data, the URLs and the timestamps of which satisfy the query conditions. To keep track of all versions of every web URL, the data set could easily scale up to terabytes. Hence, systems providing query services to such a data set would require much computing resource. We show that in this scenario data storage layout has significant impact on query performance and propose storage design principles for performance improvement through quantitative approaches. © 2010 IEEE.

关键词： Websites

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A bandwidth reservation strategy for multiprocessor real-time scheduling

A bandwidth reservation strategy for multiprocessor real-tim...

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16th IEEE Real-Time and Embedded Technology and Applications Symposium, RTAS 2010

作者： Massa, Ernesto Lima, George Department of Computer Science Distributed Systems Lab. UFBA - Federal University of Bahia Salvador Brazil

ISBN: (纸本)9780769540016

The problem of scheduling a set of tasks on a multiprocessor architecture is addressed. Tasks are assumed to be sporadic with arbitrary deadlines and may migrate between processors. The execution of migrating tasks is controlled by a bandwidth reservation scheme so that schedulab.lity is guaranteed by EDF. Task migration costs are taken into consideration. Results from experiments indicate that the proposed approach performs well in terms of schedulab.lity. © 2010 IEEE.

关键词： Scheduling

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SUDOKU: Secure and usable deployment of keys on wireless sensors

SUDOKU: Secure and usable deployment of keys on wireless sen...

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2010 6th IEEE Workshop on Secure Network Protocols, NPSec 2010

作者： Wilhelm, Matthias Martinovic, Ivan Uzun, Ersin Schmitt, Jens B. Disco / Distributed Computer Systems Lab. TU Kaiserslautern Germany Computer Science Department University of California Irvine CA United States

ISBN: (纸本)9781424489152

Initial deployment of secrets plays a crucial role in any security design, but especially in hardware constrained wireless sensor networks. Many key management schemes assume either manually pre-installed shared secrets or keys authenticated with the aid of out-of-band channels. While manually installing secret keys affects the practicability of the key deployment, out-of-band channels require additional interfaces of already hardware-limited wireless sensor nodes. In this work, we present a key deployment protocol that uses pair-wise ephemeral keys generated from physical layer information which subsequently enables an authenticated exchange of public keys. Hence, this work presents an elegant solution to the key deployment problem without requiring more capabilities than already availab.e on common low-cost devices. To justify the feasibility of this solution, we implement and experimentally evaluate the proposed key deployment protocol using commodity wireless sensor motes. ©2010 IEEE.

关键词： Network layers

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Improving Range Query Performance on Historic Web Page Data

Improving Range Query Performance on Historic Web Page Data

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ChinaGrid Annual Conference (ChinaGrid)

作者： Geng Li Bo Peng Lab of Computer Networks and Distributed Systems Peking University Beijing China

关键词： Web pages distributed databases Indexing Hard disks Optimization

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Situational method engineering applied for the enactment of development processes - An agent based approach

Situational method engineering applied for the enactment of ...

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作者： Seemueller, Holger Voos, Holger Honke, Benjamin Bauer, Bernhard Mobile Robotics and Mechatronics Lab. University of Applied Sciences Ravensburg-Weingarten D-88241 Weingarten Germany Programming Distributed Systems Lab. Institute of Computer Science University of Augsburg D-86135 Augsburg Germany

ISBN: (纸本)9789898425065

Interdisciplinary product development is faced with the collab.ration of diverse roles and a multitude of interrelated artifacts. Traditional and sequential process models cannot deal with the long-lasting and dynamic behavior of the development processes of today. Moreover, development processes have to be tailored to the needs of the projects, which are usually distributed today. Thus, keeping these projects on track from a methodology point of view is difficult. In order to deal with these challenges, this paper will present a novel method engineering and enactment approach. It combines the ideas of workflow technologies and product line engineering for method engineering as well as agent technology for the development process enactment.

关键词： Multi agent systems

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