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A Complementary Modularized Ramp Metering Approach Based on Iterative Learning Control and ALINEA

IEEE Transactions on Intelligent Transportation systems 2011年第4期12卷 1305-1318页

作者： Zhongsheng Hou Xin Xu Jingwen Yan Jian-Xin Xu Gang Xiong Advanced Control Systems Laboratory School of Electronic and Information Engineering Beijing Jiaotong University BJTU Beijing China Institute of Automation College of Mechatronics and Automation National University of Defense Technology Changsha China Department of Electrical and Computer Engineering National University of Singapore Singapore Automation Institute Chinese Academy of Sciences (CAS) Beijing China

Ramp metering is an effective tool for traffic management on freeway networks. In this paper, we apply iterative learning control (ILC) to address ramp metering in a macroscopic-level freeway environment. By formulating the original ramp metering problem as an output regulating and disturbance rejection problem, ILC has been applied to control the traffic response. The learning mechanism is further combined with Asservissement Linéaire d'Entrée Autoroutière (ALINEA) in a complementary manner to achieve the desired control performance. The ILC-based ramp metering strategy and the modified modularized ramp metering approach based on ILC and ALINEA in the presence of input constraints are also analyzed to highlight the advantages and the robustness of the proposed methods. Extensive simulations are given to verify the effectiveness of the proposed approaches.

关键词： Traffic control Mathematical model Convergence Learning systems Feedforward neural networks

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The effect of pillar array in semi-packed micro gas chromatography

The effect of pillar array in semi-packed micro gas chromato...

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IEEE SENSORS

作者： Bassam Alfeeli Shree Narayanan Mathew McMillan Daniel Hirtenstein Gary Rice Masoud Agah Department of Advanced Systems Kuwait Institute of Scientific Research Kuwait Kuwait VT MEMS Laboratory Department of Electrical and Computer Engineering Virginia Polytechnic Institute and State University Blacksburg VA USA College of William and Mary Williamsburg VA USA

ISBN: (纸本)9781424492909

Micro pillars within separation columns (SC) offer higher sample capacity but also promote fluidic eddy motion which unlike other applications has a negative effect on gas chromatography (GC). Three different semi-packed column (SPC) configurations have been evaluated with respect to pillar spacing along the flow direction and number of pillars across channel. The efficiencies of SPCs have been compared to 2 MEMS open-rectangular columns (ORCs). Simulation and experimental results demonstrated that SPC can operate at higher efficiency when spacing the pillars such that stagnation regions are created. SPC with 20μm pillar diameter and spacing achieved height-equivalent-to-a-theoretical-plate (HETP) of 0.10mm at 18cm/sec optimal velocity. ORC design with comparable channel width yielded HETP of 0.25mm at 45cm/sec. The SPC presented herein has produced 15,000 plates/m, one of the highest reported to date on coated MEMS SC while requiring only 9kPa back pressure.

关键词： Coatings Gas chromatography Micromechanical devices Compounds Silicon Fabrication Mobile communication

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Using MEMS-based preconcentrators to identify iron catalyzed lipid oxidation products in breath

Using MEMS-based preconcentrators to identify iron catalyzed...

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IEEE SENSORS

作者： Heather Vereb Bassam Alfeeli Andrea Dietrich Masoud Agah Department of Civil and Environmental Engineering Virginia Polytechnic Institute and State University Blacksburg VA USA Department of Advanced Systems Kuwait Institute of Scientific Research Kuwait Kuwait VT MEMS Laboratory Department of Electrical and Computer Engineering Virginia Polytechnic Institute and State University Blacksburg VA USA

ISBN: (纸本)9781424492909

This paper introduces, for the first time, divinylbenzene (DVB) packed microfabricated preconcentrators (μPCs) for the analysis of volatile organic compounds in breath. The 7 mm × 7 mm × 0.35 mm microcavity performance was compared to commercial solid phase microextraction (SPME) fibers commonly used in extraction and concentration of analytes in breath. The device successfully concentrated lipid oxidation products in human breath and allowed for gas chromatography analysis that distinguished control breath from treated breath produced after the subject was dosed with iron to stimulate production of lipid oxidation products that are often used as biomarkers for disease. The μPC was superior to SPME fibers incorporating the same adsorbent material and was able to detect standard compounds loaded at nanomolar (nM) concentrations.

关键词： Lipidomics Oxidation Digital video broadcasting Optical fiber devices Compounds Iron Standards

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有限反馈下大规模MIMO系统性能仿真

有限反馈下大规模MIMO系统性能仿真

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2012年全国通信理论和信号处理学术年会

作者： XU Guo-zhen 徐国珍 JIANG Wei 蒋伟 LIU An 刘安 XIANG Hai-ge 项海格 LUO Wu 罗武 State Key Laboratory of Advanced Optical Communication Systems and Networks Peking University Beijing 100871 P. R. China 北京大学区域光纤通信网与新型光通信系统国家重点实验室北京 100871 Department of Electrical and Computer Engineering Hong Kong University of Science and Technology HongKong 999077 P. R. China 香港科技大学电子与计算机工程学院香港 999077

大规模多输入多输出(multiple input multiple output,MIMO)系统由于天线数目的急剧增加,其模型与传统多入多出系统有诸多不同,反馈信息对系统性能有较大影响。针对迫零波束成形、有限反馈等条件下,对大规模MIMO系统进行仿真,研究其性能... 详细信息

大规模多输入多输出(multiple input multiple output,MIMO)系统由于天线数目的急剧增加,其模型与传统多入多出系统有诸多不同,反馈信息对系统性能有较大影响。针对迫零波束成形、有限反馈等条件下,对大规模MIMO系统进行仿真,研究其性能,对其实际应用有一定的指导意义。仿真分析表明,有限反馈下的大规模MIMO系统在反馈比特数目较少时与传统MIMO系统性能相仿,当反馈比特达到一定数目后,系统容量性能将显著提升。

关键词：移动电话多输入多输出系统反馈信息仿真分析

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Dynamics of passively phased fiber laser arrays

Dynamics of passively phased fiber laser arrays

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2011 Conference on Lasers and Electro-Optics Europe and 12th European Quantum Electronics Conference, CLEO EUROPE/EQEC 2011

作者： Jacobo, A. Colet, P. Bochove, E.J. Braiman, Y. Aceves, A.B. Deiterding, R. Miller, C.A. Rhodes, C. Shakir, S.A. UIB-CSIC Palma de Mallorca E07122 Spain Max Planck Institute for the Physics of Complex Systems Nathnitzer Straße 38 01187 Dresden Germany Air Force Research Laboratory Kirtland Air Force Base NM 87117 United States Center for Engineering Science Advanced Research Computer Science and Mathematics Division Oak Ridge National Laboratory Oak Ridge TN 37831 United States Department of Mathematics Southern Methodist University Dallas TX 75275 United States Department of Mechanical Aerospace and Biomedical Engineering University of Tennessee Knoxville TN 37996 United States Department of Mathematics University of Tennessee Knoxville TN 37996 United States Libration Systems Management Inc. Albuquerque NM 87106 United States TASC Inc. Albuquerque NM 87106 United States

ISBN: (纸本)9781457705335

The goal of scaling fiber lasers to high power levels for applications has created an interest in coherently combine the beams of a number of fibers. However, success in accurately controlling the frequencies and phases of the fields by either passive, active or hybrid means has until now been limited. Studies of the dynamics of passively phased fiber arrays have been published, but the understanding of their instabilities is limited. © 2011 IEEE.

关键词： Fiber lasers

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RASS: A real-time, accurate and scalable system for tracking transceiver-free objects

RASS: A real-time, accurate and scalable system for tracking...

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IEEE International Conference on Pervasive Computing and Communications (PerCom)

作者： Dian Zhang Yunhuai Liu Lionel M. Ni College of Software Shenzhen University China Department of Computer Science and Engineering Hong Kong University of Science and Technology Hong Kong China Shenzhen Institutes of Advanced Technology Chinese Academy and Sciences China Shanghai Key Laboratory of Scalable Computing and Systems Shanghai Jiaotong University China

Transceiver-free object tracking is to trace a moving object without carrying any communication device in an environment where the environment is pre-deployed with some monitoring nodes. Among all the tracking technologies, RF-based technology is an emerging research field facing many challenges. Although we proposed the original idea, until now there is no method achieving scalability without sacrificing latency and accuracy. In this paper, we put forward a real-time tracking system RASS, which can achieve this goal and is promising in the applications like the safeguard system. Our basic idea is to divide the tracking field into different areas, with adjacent areas using different communication channels. So the interference among different areas can be prevented. For each area, three communicating nodes are deployed on the ceiling as a regular triangle to monitor this area. In each triangle area, we use a Support Vector Regression (SVR) model to locate the object. This model simulates the relationship between the signal dynamics caused by the object and the object position. It not only considers the ideal case of signal dynamics caused by the object, but also utilizes their irregular information. As a result it can reach the tracking accuracy to around 1m by just using three nodes in a triangle area with 4m in each side. The experiments show that the tracking latency of the proposed RASS system is bounded by only about 0.26s. Our system scales well to a large deployment field without sacrificing the latency and accuracy.

关键词： Accuracy Wireless communication Wireless sensor networks Interference Lead Synchronization Predictive models

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Incident Light Influence on the Transmission of Coupled Ring Resonators

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Tsinghua Science and Technology 2010年第2期15卷 198-201页

作者：孙月徐连宇彭超李正斌 State Key Laboratory on Advanced Optical Communication Systems & Networks School of Electronic Engineering and Computer Science Peking University

The transmission matrix method is used to analyze the influence of incident light on coupled resonators. Two different types of incident light on the same coupled resonator geometry are shown to lead to different system transmission features. The EIT-like phenomenon occurs in the type I case with the transmission being symmetric around the zero-single-pass-phase-shift frequency. In the type Ⅱcase the resonant frequency has a blue shift corresponding to the increasing coupling strength between the two ring resonators. Also, the critical-coupling-like condition exists in the type Ⅱconfiguration to maintain the zero-single pass-phase-shift frequency. The incident light, as well as the geometry, partially determine the mode interference in the coupled ring resonator system.

关键词： coupled ring resonator mode excitation resonance frequency shift

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Experimental Characterization of the Reliability of 3-Terminal Dual-Damascene Copper Interconnect Trees

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MRS Online Proceedings Library 2011年第1期716卷 8131-8136页

作者： Gan, C. L. Thompson, C. V. Pey, K. L. Choi, W. K. Wei, F. Yu, B. Hau-Riege, S. P. Advanced Materials for Micro- and Nano- Systems Programme Singapore-MIT Alliance Singapore Department of Materials Science and Engineering Massachusetts Institute of Technology Cambridge USA National University of Singapore now with School of Electrical & Electronics Engineering Nanyang Technological University Nanyang Avenue Singapore Department of Electrical & Computer Engineering National University of Singapore Singapore Institute of Microelectronics San Jose USA Intel Corp. Hillsborough OR 97124 now with Lawrence Livermore National Laboratory Livermore USA

Electromigration experiments have been carried out on simple Cu dual-damascene interconnect tree structures consisting of straight via-to-via (or contact-to-contact) lines with an extra via in the middle of the line. As with Al-based interconnects, the reliability of a segment in this tree strongly depends on the stress conditions of the connected segment. Beyond this, there are important differences in the results obtained under similar test conditions for Al-based and Cu-based interconnect trees. These differences are thought to be associated with variations in the architectural schemes of the two metallizations. The absence of a conducting electromigrationresistant overlayer in Cu technology, and the possibility of liner rupture at stressed vias lead to significant differences in tree reliabilities in Cu compared to Al.

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Three-Step Carrier Frequency Offset Estimation Algorithm for Burst-Mode Communications

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电子学报(英文版) 2010年第1期19卷 165-169页

作者： LUO Wu LIU An LIANG Qinglin State Key Laboratory of Advanced Optical Communication Systems and Networks School of Electronic Engineering and Computer Science Peking University Beijing 100871 China

A data-aided frequency offset estimation algorithm suited for burst-mode communications is described and analyzed. The proposed algorithm is based on a Pilot symbol assisted modulation (PSAM) frame structure, which consists of regularly spaced pilot symbols and a group of consecutive pilot symbols embedded in. Firstly, an initial estimate based on consecutive pilot symbols is generated for reducing the phase ambiguity. Secondly, based on both spaced and consecutive pilot symbols, fine preliminary estimates are generated to improve estimation accuracy. Lastly, the final estimate is obtained by combining the fine preliminary estimates with the initial. This three-step algorithm is shown to provide high estimation accuracy close to those of FFT-based algorithm at low Signal-to-noise ratio (SNR). In addition, it is suitable for high carrier frequency offset cases.

关键词：频偏估计算法突发模式载波频偏通讯导频符号辅助载波频率偏移 FFT算法 PSAM

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On-orbit measurements of the ISS atmosphere by the vehicle cabin atmosphere monitor

On-orbit measurements of the ISS atmosphere by the vehicle c...

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41st International Conference on Environmental systems 2011, ICES 2011

作者： Darrach, M.R. Chutjian, A. Bornstein, B.J. Croonquist, A.P. Garkanian, V. Haemmerle, V.R. Hofman, J. Heinrichs, W.M. Karmon, D. Kenny, J. Kidd, R.D. Lee, S. MacAskill, J.A. Madzunkov, S.M. Mandrake, L. Rust, T.M. Schaefer, R.T. Thomas, J.L. Toomarian, N. Jet Propulsion Laboratory California Institute of Technology Pasadena CA 91109 United States Atomic and Molecular Physics Group JPL/Caltech United States Instrument Autonomy Group JPL/Caltech United States MicroDevices Group JPL/CalTech United States Optical Communications Group JPL/Caltech United States Processing Algorithms and Calibration Engineering JPL/Caltech United States Inst System Engineering JPL/Caltech United States Instruments and Science Data Systems JPL/Caltech United States Instrument Integration and Test JPL/Caltech United States Planetary Chemistry and Astrobiology JPL/Caltech United States High Capacity Computing and Modeling JPL/Caltech United States Machine Learning and Instrument Autonomy Group JPL/Caltech United States SpaceX 1 Rocket Rd Hawthorne CA 90250 United States Advanced Computer Systems and Technology JPL/Caltech United States Advanced Instrument Concepts JPL/Caltech United States

ISBN: (纸本)9781600869488

We report on trace gas and major atmospheric constituents results obtained by the Vehicle Cabin Atmosphere Monitor (VCAM) during operations aboard the International Space Station (ISS). VCAM is an autonomous environmental monitor based on a miniature gas chromatograph/mass spectrometer. It was flown to the ISS on shuttle mission STS-131 and commenced operations on 6/10/10. VCAM provides measurements of ppb-to-ppm levels of volatile trace-gas constituents, and of the atmospheric major constituents (nitrogen, oxygen, argon, and carbon dioxide) in a space vehicle or station. It is designed to operate autonomously and maintenance-free, approximately once per day, with a self-contained gas supply sufficient for a one-year lifetime. VCAM is designed to detect and identify 90% of the target compounds at their 180-day Spacecraft Maximum Allowable Concentration levels. © 2011 by the American Institute of Aeronautics and Astronautics, Inc.

关键词： Gases

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