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American control Conference

作者： Florian Dorfler Mihailo R. Jovanovic Michael Chertkov Francesco Bullo Center for Control Dynamical Systems and Computation University of California at Santa Barbara Santa Barbara CA 93106 Department of Electrical and Computer Engineering University of Minnesota Minneapolis MN 55455 Theory Division & Center for Nonlinear Studies at LANL and with New Mexico Consortium Los Alamos NM 87544

ISBN: (纸本)9781479901777

Inter-area oscillations in power networks are typically poorly controllable by means of local decentralized control. Recent research efforts have been aimed at developing wide-area control strategies that involve communication of remote signals. In conventional wide-area control strategies the control structure is fixed a priori typically based on modal criteria. In contrast, here we employ the recently introduced paradigm of sparsity-promoting optimal control to simultaneously identify the control structure and optimize the closed-loop performance. To induce a sparse control architecture, we regularize the standard quadratic performance index with an l_1-penalty on the feedback matrix. The quadratic objective functions are inspired by the classic slow coherency theory and are aimed at imitating homogeneous networks without interarea oscillations. We use a compelling example to demonstrate that the proposed combination of the sparsity-promoting optimal control design with the slow coherency objective functions performs almost as well as the optimal centralized controllers.

关键词： Power grids control Architecture damped control design control Objective function Optimal control quadratic performance index homogeneous network

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Solving the parquet equations for the Hubbard model beyond weak coupling

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Physical Review E 2013年第1期87卷 013311-013311页

作者： Ka-Ming Tam H. Fotso S.-X. Yang Tae-Woo Lee J. Moreno J. Ramanujam M. Jarrell Department of Physics and Astronomy Louisiana State University Baton Rouge Louisiana 70803 USA Center for Computation and Technology Louisiana State University Baton Rouge Louisiana 70803 USA Seagate 7801 Computer Avenue South Bloomington Minnesota 55435 USA Department of Electrical and Computer Engineering Louisiana State University Baton Rouge Louisiana 70803 USA

We find that imposing crossing symmetry in the iteration process considerably extends the range of convergence for solutions of the parquet equations for the Hubbard model. When crossing symmetry is not imposed, the convergence of both simple iteration and more complicated continuous loading (homotopy) methods is limited to high temperatures and weak interactions. We modify the algorithm to impose the crossing symmetry without increasing the computational complexity. We also imposed time reversal and a subset of the point group symmetries, but they did not further improve the convergence. We elaborate the details of the latency hiding scheme which can significantly improve the performance in the computational implementation. With these modifications, stable solutions for the parquet equations can be obtained by iteration more quickly even for values of the interaction that are a significant fraction of the bandwidth and for temperatures that are much smaller than the bandwidth. This may represent a crucial step towards the solution of two-particle field theories for correlated electron models.

关键词： PROBLEM solving HUBBARD model SYMMETRY (Physics) ITERATIVE methods (Mathematics) HOMOTOPY theory computationAL complexity TEMPERATURE effect

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Decentralised Minimum-Time Average Consensus in Digraphs

Decentralised Minimum-Time Average Consensus in Digraphs

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IEEE Annual Conference on Decision and control

作者： Themistoklis Charalambous Ye Yuan Tao Yang Wei Pan Christoforos N. Hadjicostis Michael Johansson ACCESS Linnaeus Center School of Electrical Engineering KTH-Royal Institute of Technology SE-100 44 Stockholm Sweden Control Group Department of Engineering University of Cambridge Cambridge UK Department of Bioengineering Imperial College London London UK Department of Electrical and Computer Engineering University of Cyprus Nicosia Cyprus

ISBN: (纸本)9781467357159

Distributed algorithms for average consensus in directed graphs are typically asymptotic in the literature. In this work, we propose a protocol to distributively reach average consensus in a finite number of steps on interconnection topologies that form strongly connected directed graphs (digraphs). The average consensus value can be computed, based exclusively on local observations at each component, by running a protocol that requires each component to observe and store its own value over a finite and minimal number of steps, and to have knowledge of the number of its out-going links (i.e., the number of components to which it sends information). The proposed algorithm is demonstrated via illustrative examples.

关键词： directed graphs distributed algorithms Finite

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Sampled-data Periodic Predictor Feedback for Linear Systems with Input Delay

Sampled-data Periodic Predictor Feedback for Linear Systems ...

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第三十二届中国控制会议

作者： Bin Zhou Qian Sang Zongli Lin Center for Control Theory and Guidance Technology Harbin Institute of Technology Charles LBrown Department of Electrical and Computer Engineering University of VirginiaCharlottesvilleVA 22904-4743USA

ISBN: (纸本)9781479900305

In this paper we propose sampled-data periodic predictor feedback controllers for linear systems with input *** any size of input delay and any prescribed sampling period,an explicit sampled-data periodic predictor feedback controller is constructed and shown to be able to stabilize the given delay *** a controller utilizes only the state information at the latest sampling instant and the control inputs at some past sampling *** the condition that the open-loop system is not exponentially unstable(but maybe polynomially unstable),a truncated version of the sampled-data periodic predictor feedback controller is also proposed,which is a memoryless controller that needs only the state at the latest sampling *** of the closed-loop system under the truncated sampled-data periodic predictor feedback controller is *** numerical examples are given to illustrate the effectiveness of the proposed designs.

关键词： Input delay systems sampled-date control periodic controller predictor feedback truncated predictor feedback

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Target-Tracking control Design for a Robotic Fish with Caudal Fin

Target-Tracking Control Design for a Robotic Fish with Cauda...

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第三十二届中国控制会议

作者： Songlin Chen Jianxun Wang Xiaobo Tan Control and Simulation Center Harbin Institute of Technology Smart Microsystems Laboratory Department of Electrical and Computer EngineeringMichigan State UniversityEast LansingMI 48824USA

ISBN: (纸本)9781479900305

In this paper we propose a novel target-tracking control scheme for a carangiform robotic fish based on a faithful dynamic model that combines rigid-body dynamics with Lighthill's large-amplitnde elongated-body *** first average the dynamic model under periodic tail-actuation,which results in an average model with tail-beat patterns(bias,frequency,and amplitude) as new control inputs that axe nonlinearly *** introducing two new state variables,the orientation angle error and the distance between the robotic fish body and the target location,we derived the dynamic equations for these variables, which are then used in backstepping-based controller design.A hybrid controller is proposed,where the switching is determined by whether the orientation error is above a threshold *** Lyapunov analysis,we show that the trajectory of the robotic fish will converge to the target point if the given condition is ***,the effectiveness of the proposed control strategy is demonstrated through simulation results.

关键词： Robotic fish Target-Tracking Backstepping Nonlinear Underactuated

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Nonlinear Compressive Particle Filtering

Nonlinear Compressive Particle Filtering

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IEEE Annual Conference on Decision and control

作者： Henrik Ohlsson Michel Verhaegen S. Shankar Sastry Department of Electrical Engineering and Computer Sciences University of California Berkeley CA USA Delft Center for Systems and Control Delft University Delft 2628CD The Netherlands

ISBN: (纸本)9781467357159

Many systems for which compressive sensing is used today are dynamical. The common approach is to neglect the dynamics and see the problem as a sequence of independent problems. This approach has two disadvantages. Firstly, the temporal dependency in the state could be used to improve the accuracy of the state estimates. Secondly, having an estimate for the state and its support could be used to reduce the computational load of the subsequent step. In the linear Gaussian setting, compressive sensing was recently combined with the Kalman filter to mitigate above disadvantages. In the nonlinear dynamical case, compressive sensing can not be used and, if the state dimension is high, the particle filter would perform poorly. In this paper we combine one of the most novel developments in compressive sensing, nonlinear compressive sensing, with the particle filter. We show that the marriage of the two is essential and that neither the particle filter or nonlinear compressive sensing alone gives a satisfying solution.

关键词： Particle filters Compressed sensing nonlinearity Marriage

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Postprocessing for quantum random-number generators: Entropy evaluation and randomness extraction

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Physical Review A 2013年第6期87卷 062327-062327页

作者： Xiongfeng Ma Feihu Xu He Xu Xiaoqing Tan Bing Qi Hoi-Kwong Lo Center for Quantum Information Institute for Interdisciplinary Information Sciences Tsinghua University Beijing China Center for Quantum Information and Quantum Control Department of Physics and Department of Electrical and Computer Engineering University of Toronto Toronto Ontario Canada Department of Mathematics College of Information Science and Technology Jinan University Guangzhou Guangdong China

Quantum random-number generators (QRNGs) can offer a means to generate information-theoretically provable random numbers, in principle. In practice, unfortunately, the quantum randomness is inevitably mixed with classical randomness due to classical noises. To distill this quantum randomness, one needs to quantify the randomness of the source and apply a randomness extractor. Here, we propose a generic framework for evaluating quantum randomness of real-life QRNGs by min-entropy, and apply it to two different existing quantum random-number systems in the literature. Moreover, we provide a guideline of QRNG data postprocessing for which we implement two information-theoretically provable randomness extractors: Toeplitz-hashing extractor and Trevisan's extractor.

关键词： RANDOM numbers QUANTUM states RANDOM number generators CLASSICAL mechanics OPTICS RESEARCH

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A driver face monitoring system for fatigue and distraction detection

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International Journal of Vehicular Technology 2013年第unknown期2013卷 1-11页

作者： Sigari, Mohamad-Hoseyn Fathy, Mahmood Soryani, Mohsen Control and Intelligent Processing Center of Excellence (CIPCE) School of Electrical and Computer Engineering University of Tehran Tehran 14399 Iran Computer Engineering Department Iran University of Science and Technology Tehran 16846 Iran

Driver face monitoring system is a real-time system that can detect driver fatigue and distraction using machine vision approaches. In this paper, a new approach is introduced for driver hypovigilance (fatigue and distraction) detection based on the symptoms related to face and eye regions. In this method, face template matching and horizontal projection of top-half segment of face image are used to extract hypovigilance symptoms from face and eye, respectively. Head rotation is a symptom to detect distraction that is extracted from face region. The extracted symptoms from eye region are (1) percentage of eye closure, (2) eyelid distance changes with respect to the normal eyelid distance, and (3) eye closure rate. The first and second symptoms related to eye region are used for fatigue detection;the last one is used for distraction detection. In the proposed system, a fuzzy expert system combines the symptoms to estimate level of driver hypo-vigilance. There are three main contributions in the introduced method: (1) simple and efficient head rotation detection based on face template matching, (2) adaptive symptom extraction from eye region without explicit eye detection, and (3) normalizing and personalizing the extracted symptoms using a short training phase. These three contributions lead to develop an adaptive driver eye/face monitoring. Experiments show that the proposed system is relatively efficient for estimating the driver fatigue and distraction. © 2013 Mohamad-Hoseyn Sigari et al.

关键词： HUMAN face recognition (computer science) computer vision FUZZY systems ESTIMATION theory SYSTEMS theory FACE perception

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Quantum hacking of a continuous-variable quantum-key-distribution system using a wavelength attack

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Physical Review A 2013年第6期87卷 062329-062329页

作者： Jing-Zheng Huang Christian Weedbrook Zhen-Qiang Yin Shuang Wang Hong-Wei Li Wei Chen Guang-Can Guo Zheng-Fu Han Key Laboratory of Quantum Information University of Science and Technology of China Hefei 230026 China Center for Quantum Information and Quantum Control Department of Electrical and Computer Engineering and Department of Physics University of Toronto Toronto Ontario M5S 3G4 Canada

The security proofs of continuous-variable quantum key distribution are based on the assumptions that the eavesdropper can neither act on the local oscillator nor control Bob's beam splitter. These assumptions may be invalid in practice due to potential imperfections in the implementations of such protocols. In this paper, we consider the problem of transmitting the local oscillator in a public channel and propose a wavelength attack which allows the eavesdropper to control the intensity transmission of Bob's beam splitter by switching the wavelength of the input light. Specifically we target continuous-variable quantum key distribution systems that use the heterodyne detection protocol using either direct or reverse reconciliation. Our attack is proved to be feasible and renders all of the final keys shared between the legitimate parties insecure, even if they have monitored the intensity of the local oscillator. To prevent our attack on commercial systems, a simple wavelength filter should be randomly added before performing monitoring detection.

关键词： QUANTUM mechanics QUANTUM communication HARMONIC oscillators WAVELENGTHS HETERODYNE detection

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Active self-assembly of algorithmic shapes and patterns in polylogarithmic time 13

Active self-assembly of algorithmic shapes and patterns in p...

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2013 4th ACM Conference on Innovations in Theoretical computer Science, ITCS 2013

作者： Woods, Damien Chen, Ho-Lin Goodfriend, Scott Dabby, Nadine Winfree, Erik Yin, Peng Computer Science California Institute of Technology Pasadena CA 91125 United States Center for Mathematics of Information California Institute of Technology Pasadena CA 91125 United States Chemical Engineering California Institute of Technology Pasadena CA 91125 United States Computation and Neural Systems California Institute of Technology Pasadena CA 91125 United States Bioengineering California Institute of Technology Pasadena CA 91125 United States Center for Biological Circuit Design California Institute of Technology Pasadena CA 91125 United States Department of Electrical Engineering National Taiwan University Taiwan Wyss Institute for Biologically Inspired Engineering 3 Blackfan Circle Boston MA 02445 United States

ISBN: (纸本)9781450318594

We describe a computational model for studying the complexity of self-assembled structures with active molecular components. Our model captures notions of growth and movement ubiquitous in biological systems. The model is inspired by biology's fantastic ability to assemble biomolecules that form systems with complicated structure and dynamics, from molecular motors that walk on rigid tracks and proteins that dynamically alter the structure of the cell during mitosis, to embryonic development where large scale complicated organisms efficiently grow from a single cell. Using this active self-assembly model, we show how to efficiently self-assemble shapes and patterns from simple monomers. For example we show how to grow a line of monomers in time and number of monomer states that is merely logarithmic in its length. Our main results show how to grow arbitrary connected two-dimensional geometric shapes and patterns in expected time polylogarithmic in the size of the shape plus roughly the time required to run a Turing machine deciding whether or not a given pixel is in the shape. We do this while keeping the number of monomer types logarithmic in shape size, plus monomers required by the Kolmogorov complexity of the shape or pattern. This work thus highlights the fundamental efficiency advantage of active self-assembly over passive self-assembly and motivates experimental effort to construct self-assembly systems with active molecular components. © 2013 Authors.

关键词： Self assembly

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