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Pacific Rim Conference on Lasers and Electro-Optics (CLEO/Pacific Rim)

作者： Chun Zhou Lingling Chen Yue Cai Meng Zhang Ling Ren Peng Li Zhigang Zhang Institute of Quantum Electronics State Key Laboratory of Advanced Optical Communication System and Networks School of Electronics Engineering and Computer Science Beijing Normal University Beijing China

381 kHz repetition-rate operation of an Yb-doped fiber laser oscillator and amplifier was demonstrated. The single pulse energy was 734 nJ after the single stage amplification.

ISBN: (纸本)9781424438303

381 kHz repetition-rate operation of an Yb-doped fiber laser oscillator and amplifier was demonstrated. The single pulse energy was 734 nJ after the single stage amplification.

关键词： Fiber lasers Optical fiber polarization Laser mode locking Optical fiber communication Pulse amplifiers Space vector pulse width modulation Chemical lasers Optical pulses Laser theory Oscillators

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Symmetrical buffer placement in clock trees for minimal skew immune to global on-chip variations

Symmetrical buffer placement in clock trees for minimal skew...

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IEEE International Conference on computer Design: VLSI in computers and Processors, (ICCD)

作者： Renshen Wang Takumi Okamoto Chung-Kuan Cheng Department of Computer Science and Engineering University of California San Diego CA USA System IP Core Research Laboratory NEC Corporation Limited Kawasaki Kanagawa Japan

As the feature size of VLSI circuits scales down and clock rates increases, circuit performance is becoming more sensitive to process variations. This paper proposes an algorithm of symmetrical buffer placement in symmetrical clock trees to achieve zero-skew in theory, as well as robust low skew under process or environment variations. With the completely symmetrical structure, we can eliminate many factors of clock skew such as model inaccuracy, environment temperature and intra-die process variations. We devise a new dynamic programming scheme to handle buffer placement and wire sizing under the constraint of symmetry. By classifying the wires by tree levels and defining the level-dependent blockages, the potential candidate points in the gaps of circuit blocks can be fully explored. The algorithm is efficient for minimizing source-sink delay as well as other linear cost functions. Experiments show that our method helps to obtain a balanced design of clock tree with low delay, skew and power.

关键词： Clocks Delay Very large scale integration Circuit optimization Robustness Temperature Dynamic programming Wire Classification tree analysis Cost function

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Advances in SESAM and carbon nanotube saturable absorber mode locked fiber lasers

Advances in SESAM and carbon nanotube saturable absorber mod...

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Pacific Rim Conference on Lasers and Electro-Optics (CLEO/Pacific Rim)

作者： Zhigang Zhang Meng Zhang Lingling Chen Yiyang Jiao Zhao Tu Ling Ren Yue Cai Chun Zhou Institute of Quantum Electronics State Key Laboratory of Advanced Optical Communication System and Networks School of Electronics Engineering and Computer Science Beijing Normal University Beijing China

The paper summarizes recent advances in Er and Yb doped mode locked fiber lasers with saturable absorbers such as semiconductor and carbon nanotube saturable absorbers.

ISBN: (纸本)9781424438303

The paper summarizes recent advances in Er and Yb doped mode locked fiber lasers with saturable absorbers such as semiconductor and carbon nanotube saturable absorbers.

关键词： Laser mode locking Carbon nanotubes Fiber lasers Optical fiber polarization Laser theory Absorption Optical fiber devices Semiconductor lasers Mirrors Optical fiber communication

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TSS: Applying two-stage sampling in micro-architecture simulations

TSS: Applying two-stage sampling in micro-architecture simul...

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International Symposium on Modeling, Analysis and Simulation of computer and Telecommunication systems (MASCOTS)

作者： Zhibin Yu Hai Jin Jian Chen Lizy K. John Service Computing Technology and System Laboratory Cluster and Grid Computing Laboratory Huazhong University of Science and Technology Wuhan China Department of Electrical and Computer Engineering University of Texas Austin Austin TX USA

ISBN: (纸本)9781424449279

Accelerating micro-architecture simulation is becoming increasingly urgent as the complexity of workload and simulated processor increases. This paper presents a novel two-stage sampling (TSS) scheme to accelerate the sampling-based simulation. It firstly selects some large samples from a dynamic instruction stream as candidates of detail simulation and then samples some small groups from each selected first stage sample to do detail simulation. Since the distribution of standard deviation of cycle per instruction (CPI) is insensitive to microarchitecture, TSS could be used to speedup design space exploration by splitting the sampling process into two stages, which is able to remove redundant instruction samples from detail simulation when the program is in stable program phase (standard deviation of CPI is near zero). It also adopts systematic sampling to accelerate the functional warm-up in sampling simulation. Experimental results show that, by combining these two techniques, TSS achieves an average and maximum speedup of 1.3 and 2.29 over SMARTS, with the average CPI relative error is less than 3%. TSS could significantly accelerate the time consuming iterative early design evaluation process.

关键词： Sampling methods Computational modeling Acceleration Microarchitecture computer simulation Redundancy Grid computing Space exploration computer errors Process design

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N-order difference heuristic model of fuzzy time series forecasting

N-order difference heuristic model of fuzzy time series fore...

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IEEE International Conference on Intelligent Computing and Intelligent systems (ICIS)

作者： Kai Chi Wen-Gang Che Pattern Recognition and Intelligent System School of Information Engineering and Automation Kunming University of Science and Technology China Key Laboratory of Computer Technology and Application of Yunnan Province Kunming University of Science and Technology China

Fuzzy time series forecasting model is an effective method to solve the nonlinear problems forecasting. However, most published fuzzy time series based models did not count the change trend implicit in historical datum. In this paper, authors proposed a novel method which applied heuristic information to the fuzzy time series model based on Fibonacci sequence. As an example, the USD/JPY exchange rate is tested in this model. The results show that this method not only improves the forecasting accuracy, but decreases the computational complexity.

关键词： Predictive models Technology forecasting Economic forecasting Uncertainty Fuzzy systems Pattern recognition Intelligent systems Automation Channel hot electron injection Laboratories

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Model Checking Needham-Schroeder Security Protocol Based on Temporal Logic of Knowledge

Model Checking Needham-Schroeder Security Protocol Based on ...

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International Conference on Networks Security, Wireless Communications and Trusted Computing, NSWCTC

作者： Xiangyu Luo Yan Chen Ming Gu Lijun Wu School of Software Key Laboratory of Security for Information System of Ministry of Education Tsinghua University Beijing China Department of Computer Science Guilin University of Electronic Technology Guilin China School of Computer Science and Engineering University of Electronic Science and Technology of China Chengdu China

ISBN: (纸本)9781424442232

Formal verification approaches can guarantee the correctness of security protocols. In this paper we take the well-known Needham-Schroeder public-key authentication protocol as an example, to show how we can apply the symbolic model checker for multiagent systems MCTK, which is developed by us, to the verification of security protocols. One temporal epistemic property is checked successfully both in the original version and the Lowe's revised version of the Needham-Schroeder protocol. The experimental result shows that our method is an effective way to the verification of security protocol.

关键词： Logic computer security Cryptographic protocols Communication system security Information security Electronic mail Authentication Multiagent systems Cryptography computer networks

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Investigation of curvature sensitivity of arc-induced long-period fiber gratings inscribed in a pure silica photonic crystal fiber with two large air holes in the outer cladding region

Investigation of curvature sensitivity of arc-induced long-p...

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OptoElectronics and Communications Conference, OECC

作者： Sunduck kim Gil Hwan Kim Kyu-Jin Hwang Muliar Olena Kwanil Lee Sang Hyuck Kim Je-Myung Jeong Sang Bae Lee Optical Communication Laboratory Division of Electrical and Computer Engineering Hanyang University Seoul Republic of Korea Photonics Research Laboratory Division of Intelligent System Korea Institute of Science and Technology (KIST) Seoul Republic of Korea

An arc-induced long period grating within a photonic crystal fiber with two large-diameter air holes in the cladding region has been shown as a novel curvature sensor. Due to its panda structure, the sensitivity to cu... 详细信息

关键词： Fiber gratings Silicon compounds Photonic crystal fibers Laboratories Temperature sensors Optical fiber sensors Optical sensors Fiber lasers Laser theory Ultrafast optics

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ARRAY: A Non-application-Related, Secure, Wide-Area Disaster Recovery Storage system

ARRAY: A Non-application-Related, Secure, Wide-Area Disaster...

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International Symposium on Parallel and Distributed Processing with Applications, ISPA

作者： Lingfang Zeng Dan Feng Bharadwaj Veeravalli Qingsong Wei Division of Data Storage System Wuhan National Laboratory for Optoelectronics Key Laboratory of Information Storage Ministry of Education School of Computer Science and Technology Huazhong University of Science and Technology Wuhan China Department of Electrical and Computer Engineering National University of Singapore Singapore Data Storage Institute Singapore

With our society more information-driven, we have begun to distribute data in wide-area storage systems. At the same time, both physical failure and logic error have made it difficult to bring the necessary recovery to bear on remote data disaster, and understanding this proceeding. We describe ARRAY, a system architecture for data disaster recovery that combines reliability, storage space, and security to improve performance for data recovery applications. The paper presents an exhaustive analysis of the design space of ARRAY systems, focusing on the trade-offs between reliability, storage space, security, and performance that ARRAY must make. We present RSRAII (Replication-based Snapshot Redundant Array of Independent Imagefiles) which is a configurable RAID-like data erasure-coding, and also others benefits come from consolidation both erasure-coding and replication strategies. A novel algorithm is proposed to improve snapshot performance referred to as SMPDP (Snapshot based on Multi-Parallel Degree Pipeline).

关键词： Secure storage Network servers Bandwidth Redundancy Data security Cities and towns Laboratories Educational technology Hardware History

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Voltage control scheme in distribution network with double feed induction generator wind farm

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WSEAS Transactions on Circuits and systems 2009年第8期8卷 709-718页

作者： Zhao, Jingjing Li, Xin Hao, Jutao State Key Laboratory of Power Transmission Equipment and System Security and New Technology Chongqing University 400044 Chongqing China School of Optical-Electrical and Computer Engineering University of Shanghai for Science and Technology 200093 Shanghai China

This paper presents the particle swarm optimization (PSO) for reactive power and voltage control (Volt/Var Control) in distribution system considering DFIG wind farm. In this paper, the reactive power output of DFIG wind farm has been considered as the control variables in the Volt/Var Control scheme by considering the reactive power compensation capability of DFIG. The minimization of total system real power loss and voltage deviation are utilized as an objective and the PSO is used to determine the reactive power output of DFIG wind farm, tap positions of load tap changer transformers (LTC) and numbers of the capacitor banks. Finally, the proposed scheme is applied to the 33-node distribution system. The results indicate that the proposed Volt/Var control scheme can improve the voltage profiles of distribution networks on a large scale.

关键词： Wind turbines

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Quantized Feedback Stabilization of Hybrid Impulsive Control systems

Quantized Feedback Stabilization of Hybrid Impulsive Control...

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Joint 48th IEEE Conference on Decision and Control and 28th Chinese Control Conference

作者： Zhichun Yang Yiguang Hong Zhong-Ping Jiang Xiaoli Wang Chongqing Key Lab of Operations Research and System Engineering Department of Mathematics and Computer ScienceChongqing Normal University Institute of Systems Science Chinese Academy of Sciences Key Laboratory of Systems and Control Institute of Systems ScienceChinese Academy of Sciences Dept.of Electrical & Computer Engineering Polytechnic Institute of New York University

In this paper,we consider the feedback stabilization problem of impulsive linear control systems with quantized input signals and quantized output *** concepts including quasi-invariant sets and attracting sets for hybrid impulsive quantized systems are *** on these concepts and the analysis of related dynamic properties,we propose hybrid quantized control schemes to stabilize the considered impulsive systems via state and output feedback.

关键词： quantization impulsive systems hybrid control stabilization

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