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Enhancement of pulsed laser ablation assisted with continuous wave laser irradiation

Science China(Physics,Mechanics & Astronomy) 2019年第3期62卷 66-74页

作者： Ye Ding LiJun Yang MingHui Hong Key Laboratory of Micro-systems and Micro-structures Manufacturing Ministry of Education Harbin Institute of Technology Department of Electrical and Computer Engineering National University of Singapore School of Mechatronics Engineering Harbin Institute of Technology

Continuous wave(CW) laser irradiation is employed to enhance the pulsed laser ablation of silicon and stainless steel(316 L)samples. Different surface temperatures generated by the CW laser irradiation are set as the initial working circumstance for the pulsed laser ablation. The diameter and depth of laser-ablated craters are measured to study threshold fluence, pulse incubation coefficient and ablation rate under different surface temperatures. Numerical simulation employing Heat Transfer in Solid and Deformed Geometry Interface modules in COMSOL is performed to estimate ablation rate theoretically based on Hertz-Knudsen equation. The realized crater-related data are analyzed to further obtain their dependences on surface temperature. The parametric and morphological studies indicate that the weakened plasma shielding effect and thermal diffusion in the ablated region induced by the CW laser irradiation lead to the enhanced pulsed laser ablation significantly.

关键词： enhanced pulsed laser ablation CW laser irradiation Hertz-Knudsen equation parametric and morphological studies

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A Survey of Model Predictive Control Methods for Traffic Signal Control

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IEEE/CAA Journal of Automatica Sinica 2019年第3期6卷 623-640页

作者： Bao-Lin Ye Weimin Wu Keyu Ruan Lingxi Li Tehuan Chen Huimin Gao Yaobin Chen IEEE the School of Mechanical and Electrical Engineering Jiaxing University the State Key Laboratory of Industrial Control Instituteof Cyber-Systems and Control Technology Zhejiang University the Department of Electrical and Computer Engineering Purdue School of Engineering and TechnologyIndiana University-Purdue University Indianapolis Mechanical Engineering and Mechanics Ningbo University

Enhancing traffic efficiency and alleviating(even circumventing) traffic congestion with advanced traffic signal control(TSC) strategies are always the main issues to be addressed in urban transportation systems. Since model predictive control(MPC) has a lot of advantages in modeling complex dynamic systems, it has been widely studied in traffic signal control over the past 20 years. There is a need for an in-depth understanding of MPC-based TSC methods for traffic networks. Therefore, this paper presents the motivation of using MPC for TSC and how MPC-based TSC approaches are implemented to manage and control the dynamics of traffic flows both in urban road networks and freeway networks. Meanwhile, typical performance evaluation metrics, solution methods, examples of simulations,and applications related to MPC-based TSC approaches are reported. More importantly, this paper summarizes the recent developments and the research trends in coordination and control of traffic networks with MPC-based TSC approaches. Remaining challenges and open issues are discussed towards the end of this paper to discover potential future research directions.

关键词： Autonomous vehicles coordination control mixed integer programming model predictive control system decomposition traffic flow models traffic signal control

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Full body human motion estimation on lie groups using 3D marker position measurements 16

Full body human motion estimation on lie groups using 3D mar...

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16th IEEE-RAS International Conference on Humanoid Robots, Humanoids 2016

作者： Ćesić, Josip Joukov, Vladimir Petrović, Ivan Kulić, Dana University of Zagreb Faculty of Electrical Engineering and Computing Laboratory for Autonomous Systems and Mobile Robotics Croatia University of Waterloo Department of Electrical and Computer Engineering Adaptive Systems Laboratory Canada

ISBN: (纸本)9781509047185

This paper proposes a new algorithm for full body human motion estimation using 3D marker position measurements. The joints are represented with Lie group members, including special orthogonal groups SO(2) and SO(3), and a special euclidean group SE(3). We employ the Lie Group Extended Kalman Filter (LG-EKF) for stochastic inference on groups, thus explicitly accounting for the non-euclidean geometry of the state space, and provide the derivation of the LG-EKF recursion for articulated motion estimation. We evaluate the performance of the proposed algorithm in both simulation and on real-world motion capture data, comparing it with the Euler angles based EKF. The results show that the proposed filter significantly outperforms the Euler angles based EKF, since it estimates human motion more accurately and is not affected by gimbal lock. © 2016 IEEE.

关键词： Extended Kalman filters

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Concurrent Error Detection and Testing for Large PLA's

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IEEE Journal of Solid-State Circuits 1982年第2期17卷 386-394页

作者： Khakbaz, Javad McCluskey, Edward J. Center for Reliable Computing Computer Systems Laboratory Departments of Electrical Engineering and Computer Science Stanford University Stanford CA 94305 United States

A system of checkers is designed for concurrent error detection in large PLA's. This system combines concurrent error detection with off-line functional testing of the PLA by using the same checker hardware for both purposes. The result is a significant saving in hardware cost. For a case example, the total hardware cost is estimated at about 37 percent of the original PLA area. The system is almost totally self-checking and, although the test patterns are not function-independent, their generation algorithm is simple. The total test time for the entire system is within the range of that of some recent PLA design schemes which were specifically aimed at simplifying off-line testing, but which have no provisions for concurrent error detection. Copyright © 1982 by the Institute of electrical and Electronics Engineers, Inc.

关键词： Programmable logic arrays Circuit testing System testing Hardware Costs Fault detection Test pattern generators Logic arrays Logic testing Digital systems

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Wavelength stabilization of a 980-nm semiconductor laser module stabilized with high-power uncooled dual FBG

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Chinese Optics Letters 2011年第3期9卷 57-61页

作者：黄毅泽李毅王海方俞晓静张虎张伟朱慧群周晟孙若曦张宇明 School of Optical-Electrical and Computer Engineering University of Shanghai for Science and Technology Shanghai Key Laboratory of Modern Optical Systems Institute of Thin Films and Nanomaterials Wuyi University

An optimized dual fiber Bragg grating （FBG） is proposed for 980-nm semiconductor lasers without thermoelectric coolers to restrict temperature-induced wavelength *** mathematical model of the temperature-induced wavelength shift of the laser with the dual FBG is built using the external cavity feedback rate *** external cavity parameters are optimized for achieving the stability mode-locking laser *** spectral characteristics of the dual FBG stabilized laser are measured to range from 0 to 70 °*** side mode suppression ratio （SMSR） is more than 45 dB,while the full-width at half-maximum （FWHM） is less than 1 *** peak wavelength shift is less than 0.1 *** dual FBG wavelength shift proportional coefficient is between 0.1086 and 0.4342.

关键词： Fiber Bragg gratings Laser mode locking Lasers Mathematical models Mode locked fiber lasers Optimization Thermoelectric equipment Thermoelectricity

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Pipelined scheduling of tiled nested loops onto clusters of SMPs using memory mapped network interfaces

Pipelined scheduling of tiled nested loops onto clusters of ...

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2002 IEEE/ACM Conference on Supercomputing, SC 2002

作者： Athanasaki, Maria Sotiropoulos, Aristidis Tsoukalas, Georgios Koziris, Nectarios National Technical University of Athens Dept. of Electrical and Computer Engineering Computing Systems Laboratory Greece

ISBN: (纸本)076951524X

This paper describes the performance benefits attained using enhanced network interfaces to achieve low latency communication. We present a novel, pipelined scheduling approach which takes advantage of DMA communication mode, to send data to other nodes, while the CPUs are performing calculations. We also use zero-copy communication through pinned-down physical memory regions, provided by NIC's driver modules. Our testbed concerns the parallel execution of tiled nested loops onto a cluster of SMP nodes with single PCI-SCI NICs inside each node. In order to schedule tiles, we apply a hyperplane-based grouping transformation to the tiled space, so as to group together independent neighboring tiles and assign them to the same SMP node. Experimental evaluation illustrates that memory mapped NICs with enhanced communication features enable the use of a more advanced pipelined (overlapping) schedule, which considerably improves performance, compared to an ordinary blocking schedule, implemented with conventional, CPU and kernel bounded, communication primitives. © 2002 IEEE.

关键词： Program processors

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Nonlinear Filtering With Sample-Based Approximation Under Constrained Communication:Progress, Insights and Trends

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IEEE/CAA Journal of Automatica Sinica 2024年第7期11卷 1539-1556页

作者： Weihao Song Zidong Wang Zhongkui Li Jianan Wang Qing-Long Han IEEE the State Key Laboratory for Turbulence and Complex Systems Department of Mechanics and Engineering ScienceCollege of Engineering Peking University the Department of Computer Science Brunel University London the School of Aerospace Engineering Beijing Institute of Technology the School of Science Computing and Engineering Technologies Swinburne University of Technology

The nonlinear filtering problem has enduringly been an active research topic in both academia and industry due to its ever-growing theoretical importance and practical *** main objective of nonlinear filtering is to infer the states of a nonlinear dynamical system of interest based on the available noisy measurements. In recent years, the advance of network communication technology has not only popularized the networked systems with apparent advantages in terms of installation,cost and maintenance, but also brought about a series of challenges to the design of nonlinear filtering algorithms, among which the communication constraint has been recognized as a dominating concern. In this context, a great number of investigations have been launched towards the networked nonlinear filtering problem with communication constraints, and many samplebased nonlinear filters have been developed to deal with the highly nonlinear and/or non-Gaussian scenarios. The aim of this paper is to provide a timely survey about the recent advances on the sample-based networked nonlinear filtering problem from the perspective of communication constraints. More specifically, we first review three important families of sample-based filtering methods known as the unscented Kalman filter, particle filter,and maximum correntropy filter. Then, the latest developments are surveyed with stress on the topics regarding incomplete/imperfect information, limited resources and cyber ***, several challenges and open problems are highlighted to shed some lights on the possible trends of future research in this realm.

关键词： Communication constraints maximum correntropy filter networked nonlinear filtering particle filter sample-based approximation unscented Kalman filter

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Asymptotic properties of distributed social sampling algorithm

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Science China(Information Sciences) 2020年第1期63卷 152-166页

作者： Qian LIU Xingkang HE Haitao FANG The Key Laboratory of Systems and Control Academy of Mathematics and Systems ScienceChinese Academy of Sciences School of Mathematical Sciences University of Chinese Academy of Sciences ACCESS Linnaeus Centre School of Electrical Engineering and Computer ScienceKTH Royal Institute of Technology

Social sampling is a novel randomized message passing protocol inspired by social communication for opinion formation in social networks. In a typical social sampling algorithm, each agent holds a sample from the empirical distribution of social opinions at initial time, and it collaborates with other agents in a distributed manner to estimate the initial empirical distribution by randomly sampling a message from current distribution estimate. In this paper, we focus on analyzing the theoretical properties of the distributed social sampling algorithm over random networks. First, we provide a framework based on stochastic approximation to study the asymptotic properties of the algorithm. Then, under mild conditions, we prove that the estimates of all agents converge to a common random distribution, which is composed of the initial empirical distribution and the accumulation of quantized error. Besides, by tuning algorithm parameters, we prove the strong consistency, namely, the distribution estimates of agents almost surely converge to the initial empirical distribution. Furthermore, the asymptotic normality of estimation error generated by distributed social sample algorithm is addressed. Finally, we provide a numerical simulation to validate the theoretical results of this paper.

关键词： social networks opinion formation social sampling stochastic approximation random networks asymptotic normality

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Social Energy:Mining Energy From the Society

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IEEE/CAA Journal of Automatica Sinica 2017年第3期4卷 466-482页

作者： Jun Jason Zhang David Wenzhong Gao Yingchen Zhang Xiao Wang Xiangyang Zhao Dongliang Duan Xiaoxiao Dai Jun Hao Fei-Yue Wang Department of Electrical and Computer Engineering Ritchie School of Engineering and Computer ScienceUniversity of Denver IEEE National Renewable Energy Laboratory Qingdao Academy of Intelligent Industries(QAII) QingdaoShandongChinaand SKL-MCCSCASIA School of Automation Science and Electrical Engineering Beihang University Department of Electrical and Computer Engineering College of Engineering and Applied ScienceUniversity of Wyoming State Key Laboratory of Management and Control for Complex Systems Institute of AutomationChinese Academy of Sciences(SKL-MCCSCASIA) Research Center of Computational Experiments and Parallel Systems National University of Defense Technology

The inherent nature of energy,i.e.,physicality,sociality and informatization,implies the inevitable and intensive interaction between energy systems and social *** this perspective,we define "social energy" as a complex sociotechnical system of energy systems,social systems and the derived artificial virtual systems which characterize the intense intersystem and intra-system *** recent advancement in intelligent technology,including artificial intelligence and machine learning technologies,sensing and communication in Internet of Things technologies,and massive high performance computing and extreme-scale data analytics technologies,enables the possibility of substantial advancement in socio-technical system optimization,scheduling,control and *** this paper,we provide a discussion on the nature of energy,and then propose the concept and intention of social energy systems for electrical power.A general methodology of establishing and investigating social energy is proposed,which is based on the ACP approach,i.e., "artificial systems"(A), "computational experiments"(C) and "parallel execution"(P),and parallel system methodology.A case study on the University of Denver(DU) campus grid is provided and studied to demonstrate the social energy *** the concluding remarks,we discuss the technical pathway,in both social and nature sciences,to social energy,and our vision on its future.

关键词： ACP distribution locational marginal pricing intelligent operation in power systems parallel control parallel intelligence parallel management social energy socio-technical energy systems

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Green supercomputing comes of age

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IT Professional 2008年第1期10卷 17-23页

作者： Feng, Wu-Chun Feng, Xizhou Ge, Rong Department of Computer Science and Electrical and Computer Engineering Virginia Tech. Network Dynamics and Simulation Science Laboratory Virginia Tech. Center for High-End Computing Systems Virginia Tech.

Energy-efficient (green) supercomputing has evolved to improve system reliability and provide better availability and productivity. Green Destiny supercomputing system is a Linux-based cluster that uses low-power components whose performance could be optimized for supercomputing. Low-power supercomputing focuses on energy efficiency at system integration time, selects low-power chips as the building blocks for power reduction and system reliability, and achieves better performance by scaling up to a larger number of processors. Researchers have implemented various power-aware software prototypes for commodity supercomputing starting with cluster of high-performance, high-power processors that support mechanism called dynamic voltage and frequency scaling (DVFS). Various approaches for parallel supercomputing nodes are studied by aiming execution phases that are not on the critical execution path.

关键词： Supercomputers

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