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检索条件"机构=Advanced Computer Systems Engineering Laboratory"

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P-cycle-based strategy for adaptive PWCE design

P-cycle-based strategy for adaptive PWCE design

引用

Network Architectures, Management, and Applications VI

作者： Zhang, Zhenrong Li, Zhengbin He, Yongqi Xu, Anshi State Key Laboratory of Advanced Optical Communication Systems and Networks School of Electronics Engineering and Computer Science Peking University Beijing100871 China School of Computer Electronic and Information Guangxi University Guangxi 530004 China

ISBN: (纸本)9780819473776

Future WDM optical networks are foreseen to be more dynamic and sensitive to failures. Therefore, dynamic service provisioning with network survivability becomes a critical requirement for network planning and management. The concept of protected working capacity envelope (PWCE) is attractive because it does not need protection resources to be dynamically configured thereby simplifying network management and reducing processing overheads. In this paper, we consider a p-Cycle-based Strategy for adaptive PWCE (protected working capacity envelope) design where PWCE can adaptively change with dynamically changing traffic. The blocking performance of this new strategy is compared to that of p-Cycle-based PWCE under a dynamic and non-uniform traffic model. The results show that the new strategy can adapt well to dynamic traffic demands that are non-uniform among the network nodes. © 2008 SPIE.

关键词： Adaptive optics

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Server Vision: A new perspective for next generation optical networks

Server Vision: A new perspective for next generation optical...

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Network Architectures, Management, and Applications VI

作者： Zhang, Zhenrong Li, Zhengbin Yuan, Chi Xu, Anshi State Key Laboratory of Advanced Optical Communication Systems and Networks School of Electronics Engineering and Computer Science Peking University Beijing100871 China School of Computer Electronic and Information Guangxi University Guangxi 530004 China

ISBN: (纸本)9780819473776

Under the current and foreseeable limitations of optical technology, performance of the next generation optical network is mainly hampered at the network node by resource contention. Existing work addresses contention resolution mostly in the wavelength domain (as wavelength conversion, WC), the time domain (buffering by using fiber delay lines, FDLs, the space domain (as deflection routing), and the burst domain (as segmentation). In this paper, a new architecture of optical networks-the server view based on optical networks is proposed. From the point of this new architecture, the network can be modeled as a server system with three type servers-the access server, the node server and the link server. The network performances such as cost, energy consume and network capacity can be affected by the capability of these three type servers. Unlike existing research activities that are focused on the node server design, we present the Dual fiber link (the link server solution) and IP calking evaluate the performance of the proposed methods, computer simulations are conducted. The simulation results show these solutions can reduce the contention effectively with existing commercial devices. © 2008 SPIE.

关键词： Network architecture

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Novel approaches to improve the capacity of optical packet-switched networks without optical buffers 08

Novel approaches to improve the capacity of optical packet-s...

引用

2008 International Conference on advanced Infocomm Technology, ICAIT '08

作者： Chi, Yuan Zhengbin, Li Anshi, Xu State Key Laboratory of Advanced Optical Communication Systems Networks School of Electronics Engineering and Computer Science Peking University No. 5 Yiheyuan Road Haidian District Beijing China

ISBN: (纸本)9781605580883

Under the current and foreseeable limitations of optical technology, performance of optical packet-switched networks is mainly hampered at the network node by resource contention. The contention is serious constraints on the capacity of the network. Therefore, most of the research activities are focus on the node design. Unlike the existing research activities are focus on the node design, we proposed a new concept-server vision for optical packet-switched networks in this paper. From the point of view of server vision, the network resource is categorized into three types-the access server, the node server and the link server, based on the fact that the network resource performs the different function for the traffic. After present the server vision optical network, we presented two novel approaches-two link server solutions-to erase the resource contention. One solution is the packet calking, and the other solution is the dual-fiber link. We have developed some scenarios to validate these solutions. Simulation results show that the dual-fiber link can reduce the contention in terms of orders of magnitude in optical packetswitched networks without optical buffers and wavelength conversions. Copyright © 2008 ACM.

关键词： Packet switching

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The construction of a FBG-based hierarchical AOFSN with high reliability and scalability

The construction of a FBG-based hierarchical AOFSN with high...

引用

Optical Transmission, Switching, and Subsystems VI

作者： Peng, Li-Mei Yang, Won-Hyuk Li, Xin-Wan Kim, Young-Chon Department of Computer Engineering Chonbuk National University Jeonju 561-756 Korea Republic of State Key Laboratory of Advanced Optical Communication Systems and Networks Department of Electronic Engineering Shanghai Jiao Tong University Shanghai 200240 China

To improve the reliability and scalability that are very important for large-scale all optical fiber sensor networks (AOFSN), three-level hierarchical sensor network architectures are proposed. The first two levels consist of active interrogation and RNs, respectively. The third level called sensor subnet (SSN) consists of passive FBGs and a few switches. As AOFSN is mainly multiplexed by wired and passive FBGs, the routing algorithm for scanning sensors is determined by the virtual topology of SSN due to the passivity. Therefore, the research concentrates on the construction of SSN and aims at proposing regular and unicursal virtual topology to realize reliable and scalable routing schemes. Two regular types of SSNs are proposed. Each type consists of several sensor cells (SC), square-based SC (SSC) or pentagon-based SC (PSC) and is scaled several times from the SCs. The virtual topologies maintain the self-similar square- or pentagon-like architecture so as to gain simple routing. Finally, the switch architecture of RN is proposed for the reliability of the first two levels;and then, the reliability and scalability of SSN are discussed in view of how much link failures can be tolerant, and how each SC is scaled to maintain the self-similarity, respectively. © 2008 SPIE.

关键词： Reliability

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Characterizing User-Level Network Virtualization: Performance, Overheads and Limits

Characterizing User-Level Network Virtualization: Performanc...

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IEEE International Conference on e-Science and Grid Computing

作者： Maurício Tsugawa José A. B. Fortes Advanced Computing and Information Systems Laboratory Advanced Computing and Information Systems Laboratory Department of Electrical and Computer Engineering University of Florida Gainesville FL USA

Connectivity limitations of the current Internet pose challenges to e-Science infrastructure, as communication between resources is of key importance for the sharing of hardware, software and data across geographically distributed institutions. To overcome such limitations many overlay networks have been developed. Existing solutions report performance that can keep up with slow wide-area links - however the question remains as to how overlay networks perform on new high-speed Internet connections. This paper characterizes the performance of user-level packet processing, which is at the core of most overlay networks implementations. To this end, building blocks of packet processing software are identified and characterized, and performance of IP forwarders developed in C and Java are compared through extensive measurements. Factors that affect the performance of overlay networks and limitations of existing solutions are characterized, providing insights on possible improvements. Experimental results show the following: to achieve maximum throughput, only a few microseconds (2 to 5) can be spent in virtual network processing; processing of small packets can limit TCP throughput; and overlays need to be carefully architected as encapsulation overheads can be substantial.

关键词： IP networks Software performance Java Hardware Throughput Peer to peer computing Routing Resource virtualization computer networks Distributed computing

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An Ultra-Wideband Resistive-Feedback Low-Noise Amplifier with Noise Cancellation in 0.18μm Digital CMOS

An Ultra-Wideband Resistive-Feedback Low-Noise Amplifier wit...

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Topical Meeting on Silicon Monolithic Integrated Circuits in RF systems

作者： Jianyun Hu Yunliang Zhu Hui Wu Laboratory for Advanced Integrated Circuits and Systems Department of Electrical and Computer Engineering University of Rochester USA

We present a wideband resistive feedback CMOS low-noise amplifier (LNA) with noise cancellation technique for ultra-wideband applications. The LNA achieves a 3-dB bandwidth of 0.7-6.5 GHz, power gain of 12.5 dB, and noise figure of 3.5-4.2 dB within the 3-dB bandwidth. The input matching is better than -11 dB from 0.7 to 12 GHz. The IIP3 is measured -5 dBm at 5 GHz. It is implemented in a 0.18 mum standard digital CMOS technology, occupies an area of 0.78 mmtimes0.68 mm, and consumes 11.1 mW from a 1.8 V supply.

关键词： Ultra wideband technology Low-noise amplifiers Noise cancellation Impedance matching Bandwidth Broadband amplifiers Voltage Noise measurement Frequency Phase noise

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CloudBLAST: Combining MapReduce and Virtualization on Distributed Resources for Bioinformatics Applications

CloudBLAST: Combining MapReduce and Virtualization on Distri...

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IEEE International Conference on e-Science and Grid Computing

作者： Andréa Matsunaga Maurício Tsugawa José Fortes Advanced Computing and Information Systems Laboratory Department of Electrical and Computer Engineering University of Florida Gainesville FL USA

This paper proposes and evaluates an approach to the parallelization, deployment and management of bioinformatics applications that integrates several emerging technologies for distributed computing. The proposed approach uses the MapReduce paradigm to parallelize tools and manage their execution, machine virtualization to encapsulate their execution environments and commonly used data sets into flexibly deployable virtual machines, and network virtualization to connect resources behind firewalls/NATs while preserving the necessary performance and the communication environment. An implementation of this approach is described and used to demonstrate and evaluate the proposed approach. The implementation integrates Hadoop, Virtual Workspaces, and ViNe as the MapReduce, virtual machine and virtual network technologies, respectively, to deploy the commonly used bioinformatics tool NCBI BLAST on a WAN-based test bed consisting of clusters at two distinct locations, the University of Florida and the University of Chicago. This WAN-based implementation, called CloudBLAST, was evaluated against both non-virtualized and LAN-based implementations in order to assess the overheads of machine and network virtualization, which were shown to be insignificant. To compare the proposed approach against an MPI-based solution, CloudBLAST performance was experimentally contrasted against the publicly available mpiBLAST on the same WAN-based test bed. Both versions demonstrated performance gains as the number of available processors increased, with CloudBLAST delivering speedups of 57 against 52.4 of MPI version, when 64 processors on 2 sites were used. The results encourage the use of the proposed approach for the execution of large-scale bioinformatics applications on emerging distributed environments that provide access to computing resources as a service.

关键词： Application virtualization Resource virtualization Bioinformatics Distributed computing Virtual machining Testing Technology management computer network management Environmental management Resource management

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Multiple scale analysis of semiconductor amplifiers

Multiple scale analysis of semiconductor amplifiers

引用

International Conference on advanced Optoelectronics and Lasers (CAOL)

作者： Malin Premaratne Advanced Computing and Simulation Laboratory (AXL) Department of Electrical and Computer Systems Engineering Monash University Clayton VIC Australia

Short-pulse propagation in optical amplifiers has been widely studied for applications in optical signal processing and optical communications areas. Even though it is possible to integrate differential equations numerically, such implementations may not provide adequate insight into the device operation. We propose a systematic way to construct analytical solutions under pulsed conditions and show excellent agreement with numerically integrated results. Our approach makes use of the multiple-scale technique in which different time scales associated with physical processors are cleverly used to partition amplifier response to different regions where analytical solution can be found using simple techniques.

关键词： Semiconductor optical amplifiers Pulse amplifiers Optical pulses Optical pulse shaping Stimulated emission Optical signal processing Optical amplifiers Nonlinear optics Space vector pulse width modulation computer crime

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Multiple-scale Analysis of Optical Amplifiers

Multiple-scale Analysis of Optical Amplifiers

引用

IEEE PhotonicsGlobal@Singapore, IPGC

作者： Malin Premaratne Advanced Computing and Simulation Laboratory (AXL) Department of Electrical and Computer Systems Engineering Monash University Clayton VIC Australia

关键词： Stimulated emission Semiconductor optical amplifiers Optical amplifiers Pulse amplifiers Optical pulses Optical signal processing Space vector pulse width modulation Optical pulse shaping Optical computing Atom optics

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Resonance between free space light and waveguide TM mode via surface plasmon wave

Resonance between free space light and waveguide TM mode via...

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International Nano-Optoelectronics Workshop (i-NOW)

作者： Guangyuan Li Anshi Xu State Key Laboratory of Advanced Optical Communication Systems & Networks (Peking University) School of Electronics Engineering and Computer Science Peking University Beijing China

Resonance between free space light and waveguide TM mode via surface plasmon wave is reported for the first time. Simulations show that the beaming angle of the excited free space light can be controlled.

关键词： Optical waveguides Indexes Optical films Metals Aerospace electronics Surface waves Finite element methods

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