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Metrology with PT-Symmetric Cavities: Enhanced Sensitivity near the PT-Phase Transition

Physical Review Letters 2016年第11期117卷 110802-110802页

作者： Zhong-Peng Liu Jing Zhang Şahin Kaya Özdemir Bo Peng Hui Jing Xin-You Lü Chun-Wen Li Lan Yang Franco Nori Yu-xi Liu Department of Automation Tsinghua University Beijing 100084 China Tsinghua National Laboratory for Information Science and Technology Beijing 100084 China Department of Electrical and Systems Engineering Washington University St. Louis Missouri 63130 USA CEMS RIKEN Saitama 351-0198 Japan Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education Department of Physics and Synergetic Innovation Center for Quantum Effects and Applications Hunan Normal University Changsha 410081 China School of Physics Huazhong University of Science and Technology Wuhan 430074 China Physics Department The University of Michigan Ann Arbor Michigan 48109 USA Institute of Microelectronics Tsinghua University Beijing 100084 China

We propose and analyze a new approach based on parity-time (PT) symmetric microcavities with balanced gain and loss to enhance the performance of cavity-assisted metrology. We identify the conditions under which PT-symmetric microcavities allow us to improve sensitivity beyond what is achievable in loss-only systems. We discuss the application of PT-symmetric microcavities to the detection of mechanical motion, and show that the sensitivity is significantly enhanced near the transition point from unbroken- to broken-PT regimes. Our results open a new direction for PT-symmetric physical systems and it may find use in ultrahigh precision metrology and sensing.

关键词： Cavity quantum electrodynamics Optomechanics PT-symmetric quantum mechanics Quantum metrology

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A Pruning Method Based on Weight Variation Information for Feedforward Neural Networks

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IFAC-PapersOnLine 2015年第18期48卷 221-226页

作者： Zhiqiang Tong Gouhei Tanaka Department of Electrical Engineering and Information Systems Graduate School of Engineering The University of Tokyo Tokyo 113-8656 Japan Institute for Innovation in International Engineering Education Graduate School of Engineering The University of Tokyo Tokyo 113-8656 Japan Institute of Industrial Science The University of Tokyo Tokyo 153-8505 Japan

Artificial neural networks are powerful tools for many information processing tasks such as pattern recognition, data mining, optimization, and prediction. It is a significant problem to find optimal structures of artificial neural networks for drawing out their high computational performance. Downsizing of network structure is also an issue to be considered for hardware implementation of large-scale neural networks. In this study, we propose a pruning method to find a compact structure of feedforward neural networks with high generalization ability in classification problems. Our method evaluates the significance of neuron nodes using the information on weight variation in the training process and prune the insignificant nodes preferentially unless the classification accuracy is degraded. Numerical experiments with several benchmark datasets show that the proposed method is effective compared with other methods.

关键词： Neural networks Feedforward networks Pruning methods Data classification

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Facile immobilization of heparin on bioabsorbable iron via mussel adhesive protein(MAPs)

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Progress in Natural science:Materials International 2014年第5期24卷 458-465页

作者： Xuchen Xu Ming Li Qian Liu Zhaojun Jia Yuying Shi Yan Cheng Yufeng Zheng L.Q. Ruan Center for Biomedical Materials and Tissue Engineering Academy for Advanced Interdisciplinary StudiesPeking University Department of Materials Science and Engineering College of Engineering Peking University Department of Mechanical Systems Engineering Graduate School of Science and TechnologyKumamoto University

Motivated by adhesive proteins in mussels, strategies using dopamine to modified surface have become particularly attractive. In the present work, we developed a novel and convenient method to modify the biodegradable Fe plates with heparin. Iron was first treated by a facile one-step p H-induced polymerization of dopamine, and then a high density heparin was successfully grafted onto the surface via coupling with polydopamine(PDA) active layer. Heparin immobilization contributed much longer blood clotting coagulation time than the pure Fe sample, and hence reduced the risk of thrombosis. Cell viability tests suggested that the heparin modified Fe plates were more favorable to the proliferation of ECV304 cells. In summary, the heparin modified Fe plates with good anti-thrombus properties and inhibiting the proliferation of VSMC cells provide great prospects for biodegradable iron.

关键词： Iron Heparin Dopamine Surface modification Biodegradable stent Hemocompatibility

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International Society for Therapeutic Ultrasound Conference 2016

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Journal of Therapeutic Ultrasound 2017年第1期5卷 1-114页

作者： Brian Fowlkes Pejman Ghanouni Narendra Sanghvi Constantin Coussios Paul C. Lyon Michael Gray Christophoros Mannaris Marie de Saint Victor Eleanor Stride Robin Cleveland Robert Carlisle Feng Wu Mark Middleton Fergus Gleeson Jean-Franҫois Aubry Kim Butts Pauly Chrit Moonen Jacob Vortman Shirley Sharabi Dianne Daniels David Last David Guez Yoav Levy Alexander Volovick Javier Grinfeld Itay Rachmilevich Talia Amar Zion Zibly Yael Mardor Sagi Harnof Michael Plaksin Yoni Weissler Shy Shoham Eitan Kimmel Omer Naor Nairouz Farah Dong-Guk Paeng Zhiyuan Xu John Snell Anders H. Quigg Matthew Eames Changzhu Jin Ashli C. Everstine Jason P. Sheehan Beatriz S. Lopes Neal Kassell Thomas Looi Vera Khokhlova Charles Mougenot Kullervo Hynynen James Drake Michael Slayton Richard C. Amodei Keegan Compton Ashley McNelly Daniel Latt John Kearney David Melodelima Aurelien Dupre Yao Chen David Perol Jeremy Vincenot Jean-Yves Chapelon Michel Rivoire Wei Guo Guoxin Ren Guofeng Shen Michael Neidrauer Leonid Zubkov Michael S. Weingarten David J. Margolis Peter A. Lewin Nathan McDannold Jonathan Sutton Natalia Vykhodtseva Margaret Livingstone Thiele Kobus Yong-Zhi Zhang Michael Schwartz Yuexi Huang Nir Lipsman Jennifer Jain Martin Chapman Tejas Sankar Andres Lozano Robert Yeung Christakis Damianou Nikolaos Papadopoulos Omer Brokman Eyal Zadicario Ori Brenner David Castel Shih-Ying Wu Julien Grondin Wenlan Zheng Marc Heidmann Maria Eleni Karakatsani Carlos J. Sierra Sánchez Vincent Ferrera Elisa E. Konofagou Marinos Yiannakou HongSeok Cho Hwayoun Lee Mun Han Jong-Ryul Choi Taekwan Lee Sanghyun Ahn Yongmin Chang Juyoung Park Nicholas Ellens Ari Partanen Keyvan Farahani Raag Airan Alexandre Carpentier Michael Canney Alexandre Vignot Cyril Lafon Jean-yves Delattre Ahmed Idbaih Henrik Odéen Bradley Bolster Eun Kee Jeong Dennis L. Parker Pooja Gaur Xue Feng Samuel Fielden Craig Meyer Beat Werner William Grissom Michael Marx Hans Weber Valentina Taviani Brian Hargreaves Jun Tanaka Kentaro Kikuchi Ayumu Ishijima Takashi Azuma Kosuke Minamihata Satoshi Basic Radiological Sciences Division Department of Radiology University of Michigan Ann Arbor USA Stanford School of Medicine Stanford USA SonaCare Medical Indianapolis USA Institute of Biomedical Engineering University of Oxford Oxford UK HIFU Unit Churchill Hospital Oxford UK Department of Oncology University of Oxford Oxford UK Department of Radiology Churchill Hospital Oxford UK Institut Langevin Paris France Center for Imaging Sciences Imaging Division University Medical Center Utrecht The Netherlands InSighTec Haifa Israel Sheba Medical Center Ramat-Gan Israel Tel-Aviv University Tel-Aviv Israel Faculty of Biomedical Engineering & Russell Berrie Nanotechnology Institute Technion – Israel Institute of Technology Haifa Israel ELSC Center for Brain Sciences Hebrew University Jerusalem Israel Biomedical Engineering Technion- Israel Institute of Technology Haifa Israel Faculty of Life Sciences Bar Ilan University Ramat Gan Israel Focused Ultrasound Foundation Charlottesville USA Ocean System Engineering Jeju National University Jeju Republic of Korea Neurosurgery University of Virginia Charlottesville USA Biology University of Virginia Charlottesville USA Pathology University of Virginia Charlottesville USA Hospital for Sick Children Toronto Canada University of Toronto Toronto Canada University of Washington Seattle USA Philips Healthcare Markham Canada Sunnybrook Research Institute Toronto Canada Guided Therapy Systems LLC Mesa USA School of Medicine University of Arizona Tucson USA The CORE Institute Phoenix USA LabTAU - U1032 INSERM Lyon France Centre Leon Berard Lyon France Department of Oral Maxillofacial and Head Neck Oncology Shanghai 9th People’s Hospital Shanghai China The School of Biomedical Engineering Science and Health Systems Drexel University Philadelphia USA Department of Surgery College of Medicine Drexel University Philadelphia USA Biostatistics and Epidemiology University of Pennsylvania Philadelphi

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Alignment of cyclically ordered trees 4

Alignment of cyclically ordered trees

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4th International Conference on Pattern Recognition Applications and Methods, ICPRAM 2015

作者： Yoshino, Takuya Hirata, Kouichi Graduate School of Computer Science and Systems Engineering Kyushu Institute of Technology Kawazu 680-4 Iizuka820-8502 Japan Department of Artificial Intelligence Kyushu Institute of Technology Kawazu 680-4 Iizuka820-8502 Japan

ISBN: (纸本)9789897580765

In this paper, as unordered trees preserving the adjacency among siblings, we introduce the following three kinds of a cyclically ordered tree, that is, a biordered tree that allows both a left-to-right and a right-to-left order among siblings, a cyclic-ordered tree that allows cyclic order among siblings in a left-to-right direction and a cyclic-biordered tree that allows cyclic order among siblings in both left-to-right and right-to-left directions. Then, we design the algorithms to compute the alignment distance and the segmental alignment distance between biordered trees in O(n2D2) time and ones between cyclic-ordered trees and cyclic-biordered trees in O(n2D4) time, where n is the maximum number of nodes and D is the maximum degree in two given trees.

关键词： Forestry

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An algorithm for 3D reconstruction based on point-cloud image sequence

An algorithm for 3D reconstruction based on point-cloud imag...

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2015 IEEE advanced Information Technology,Electronic and Automation control Conference(IAEAC 2015)

作者： Xusheng Shi Bin Zhao Advanced Manufacturing Technology and Systems Research Center in Department of Industrial and Manufacturing Systems Engineering of Beihang University School of Automation Science and Electrical Engineering of Beihang University

ISBN: (纸本)9781479919819

A method named space carving was proposed which is for the calculation of object's surface point-cloud based on its *** process of the algorithm based on the space carving theory was developed by C++ and the point-cloud was got for reconstructing object's 3D model in the ***,the method of this paper was proved,it have not any limit with the size of the object,and only one digital camera and rotating stage is needed in the whole process,so compare with the traditional modeling system,it greatly reduces the cost of the system.

关键词： 3D reconstruction space carving object's pointcloud model

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Essential matrix decomposition without dependence of singular value decomposition

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Journal of Information and Computational science 2015年第8期12卷 3299-3309页

作者： Wu, Chunfu Tang, Qingshun Zhou, Fengyu Wang, David School of Mechanical and Electrical Engineering Longyan University Longyan China School of Control Science and Engineering Shandong University Jinan China Department of Systems and Computer Engineer Carleton University Canada

This paper presents a novel essential matrix decomposition method. Firstly, two constructed infinite homographies are affected on the original two views respectively, so that the principal points of the transformed views are point correspondence, and the transformed views' essential matrix is determined. Secondly, the camera translation is determined, after which an assisted rotation matrix is constructed to decompose camera rotation using NANSON formula. Finally, the unique solution is determined easily and conveniently with the 3D-point visibility constraint. The experimental results show that, it has a better real-time performance not only because of the avoidance of time consuming SVD operation, but also for the avoidance of the scene structure computation in the determination of the unique solution. Copyright © 2015 Binary Information Press.

关键词： Singular value decomposition

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A probabilistic estimation method of reactive power controlled by PCS using measurement data of switchgears with sensors

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IEEJ Transactions on Power and Energy 2016年第4期136卷 410-423页

作者： Koide, Akira Tsuji, Takao Oyama, Tsutomu Goda, Tadahiro Kojima, Yasuhiro Shinji, Takao Uchida, Kenko Magoulès, Frédéric Graduate School of Engineering Yokohama National University 79-5 Tokiwa-dai Hodogaya-ku Yokohama240-8501 Japan Department of Engineering Doshisha University 1-3 Tatara Miyakodani Kyotanabe610-0394 Japan Energy and Industrial Systems Group Mitsubishi Electric Corp. 2-7-3 Marunouchi Chiyoda-ku Tokyo100-8310 Japan Tokyo Gas Co. Ltd. 1-5-20 Kaigan Minato-ku Tokyo105-8527 Japan Faculty of Science and Engineering Waseda University 3-4-1 Okubo Shinjuku Tokyo169-8555 Japan Mathematics Applied to Systems Ecole Centrale Paris Grande Voie des Vignes Châtenay-Malabry Cedex92295 France

It becomes an important issue to maintain voltage profile within the allowable range in distribution systems with a large number of distributed generators (DGs), such as Photovoltaic (PV). Although reactive power control by power conditioning system (PCS) is effective to mitigate the voltage increase, there is a possibility that active power curtailment is needed to provide enough amount of reactive power due to current limitation. Here, it is expected that the active power curtailment can be avoided if a cooperative voltage control between load ratio tap controller (LRT) and PCS is realized. To this end, system operators have to know the amount of reactive power controlled by PCS. Hence, in this paper, we developed a new state estimation method of the reactive power using the measurement data obtained by the switchgears with sensors. In addition, a probabilistic approach was applied because an accurate estimation is theoretically impossible only by using the limited number of measurement data. The proposed method was tested in a hierarchic distribution system model and its effectiveness was shown through simulations. © 2016 The Institute of Electrical Engineers of Japan.

关键词： Reactive power

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Surgical Robot control Based on Torque control Method

Surgical Robot Control Based on Torque Control Method

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2015 5th International Conference on Information engineering for Mechanics and Materials(ICIMM 2015)

作者： Bin Zhao Xusheng Shi School of Automation Science and Electrical Engineering Beihang University Advanced Manufacturing Technology and Systems Research Center Department of Industrial and Manufacturing Systems Engineering Beihang University

Surgical robots are usually controlled by the method of the independent PD or the PD model based on gravity compensation. However, the system is still a open loop control with both of the control models. The two models can not consider the dynamics effectively either. The position error can not be guaranteed. To solve the problem, a torque control model based on dynamic model and adaptive model is proposed. And the position tolerance of PD control based on gravity compensation and that of control based on Torque control stability theory are compared by Matlab software. The maximal tolerance of the new method is red robot end-effector is 0.15 mm.

关键词： Surgical Robot Torque control Adaptive control

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Optimizing energy consumption and preventing slips at the footstep planning level

Optimizing energy consumption and preventing slips at the fo...

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IEEE-RAS International Conference on Humanoid Robots

作者： Martim Brandão Kenji Hashimoto José Santos-Victor Atsuo Takanishi The Graduate School of Advanced Science and Engineering Waseda University The Waseda Institute for Advanced Study and is a researcher at the Humanoid Robotics Institute (HRI) Institute for Systems and Robotics Universidade de Lisboa Department of Modern Mechanical Engineering Waseda University

Energy consumption and stability are two important problems for humanoid robots deployed in remote outdoor locations. In this paper we propose an extended footstep planning method to optimize energy consumption while considering motion feasibility and ground friction constraints. To do this we estimate models of energy, feasibility and slippage in physics simulation, and integrate them into a hybrid A* search and optimization-based planner. The graph search is done in footstep position space, while timing (leg swing and double support times) and COM motion (parameterized height trajectory) are obtained by solving an optimization problem at each node. We conducted experiments to validate the obtained energy model on the real robot, as well as planning experiments showing 9 to 19% energy savings. In example scenarios, the robot can correctly plan to optimally traverse slippery patches or avoid them depending on their size and friction; and uses stairs with the most beneficial dimensions in terms of energy consumption.

关键词： Planning Energy consumption Friction Biological system modeling Robot kinematics

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