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IEEE International Symposium on Circuits and systems

作者： Li-Wei Kang Chia-Wen Lin Che-Tsung Lin Yu-Chen Lin Institute of Information Science Academia Sinica Taipei Taiwan Department of Electrical Engineering National Tsing Hua University Hsinchu Taiwan Safety Sensing and Control Department Intelligent Mobility Division Mechanical and Systems Laboratories Industrial Technology Research Institute Hsinchu Taiwan

ISBN: (纸本)9781467302180

Rain removal from an image/video is a challenging problem and has been recently investigated extensively. In our previous work, we have proposed the first single-image-based rain streak removal framework via properly formulating it as an image decomposition problem based on morphological component analysis (MCA) solved by performing dictionary learning and sparse coding. However, in this previous work, the dictionary learning process cannot be fully automatic, where the two dictionaries used for rain removal were selected heuristically or by human intervention. In this paper, we extend our previous work to propose an automatic self-learning-based rain streak removal framework for single image. We propose to automatically self-learn the two dictionaries used for rain removal without additional information or any assumption. We then extend our single-image-based method to video-based rain removal in a static scene by exploiting the temporal information of successive frames and reusing the dictionaries learned by the former frame(s) in a video while maintaining the temporal consistency of the video. As a result, the rain component can be successfully removed from the image/video while preserving most original details. Experimental results demonstrate the efficacy of the proposed algorithm.

关键词： Rain Dictionaries Image decomposition Feature extraction Hafnium Training Image coding

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Theoretical Treatment of Target Coverage in Wireless Sensor Networks

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Journal of Computer science & technology 2011年第1期26卷 117-129页

作者：谷雨赵保华计宇生李颉 School of Computer Science University of Science and Technology of China State Key Laboratory of Networking and Switching Technology Information Systems Architecture Science Research Division National Institute of InformaticsTokyoJapan Department of Computer Science University of TsukubaTsukuba Science CityIbarakiJapan

The target coverage is an important yet challenging problem in wireless sensor networks, especially when both coverage and energy constraints should be taken into account. Due to its nonlinear nature, previous studies of this problem have mainly focused on heuristic algorithms; the theoretical bound remains unknown. Moreover, the most popular method used in the previous literature, i.e., discretization of continuous time, has yet to be justified. This paper fills in these gaps with two theoretical results. The first one is a formal justification for the method. We use a simple example to illustrate the procedure of transforming a solution in time domain into a corresponding solution in the pattern domain with the same network lifetime and obtain two key observations. After that, we formally prove these two observations and use them as the basis to justify the method. The second result is an algorithm that can guarantee the network lifetime to be at least （1 - ε） of the optimal network lifetime, where ε can be made arbitrarily small depending on the required precision. The algorithm is based on the column generation （CG） theory, which decomposes the original problem into two sub-problems and iteratively solves them in a way that approaches the optimal solution. Moreover, we developed several constructive approaches to further optimize the algorithm. Numerical results verify the efficiency of our CG-based algorithm.

关键词： target coverage wireless sensor networks time-dependent solution pattern-based solution column generation

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Using Mobile Sinks in WSN: Computational Complexity and a Theoretical Bound

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电子学报(英文版) 2011年第1期20卷 147-150页

作者： GU Yu JI Yusheng CHEN Hongyang ZHAO Baohua Department of Computer Science University of Science and Technology of China Hefei China State Key Laboratory of Networking and Switching Technology Beijing China Information Systems Architecture Science Research Division NII Tokyo Japan Institute of Industrial Science University of Tokyo Tokyo Japan

In this paper, we study the lifetime op- timization problem in wireless sensor networks using mo- bile sink nodes. This problem is inherently difficult since we need to consider both sink scheduling and data rout- ing. Through a simple case study we develop a novel no- tation named the Placement pattern (PP) to bound traffic patterns with candidate locations. This significantly de- creases the number of elements needed to be scheduled. Based on the PP, we mathematically formulate this opti- mization problem as a Mixed-integer non-linear program- ming (MINLP), which is very tough and time consuming to solve. By proving that the problem is NP-complete, we point out that instead of seeking an optimal algorithm, heuristic algorithms, especially those with performance guarantee, would be much more desirable to develop. Fur- thermore, in order to help identify performance gains of heuristic algorithms proposed in the future, we develop a Linear programming (LP) formulation which serves as an upper bound by adopting a reformulation and relaxation technique.

关键词：无线传感器网络移动接收计算复杂性混合整数非线性规划启发式算法 NP完全问题优化问题 MINLP

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An Efficient Resource Allocation Algorithm with Carrier Aggregation in LTE Advanced systems

An Efficient Resource Allocation Algorithm with Carrier Aggr...

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International Conference on Wireless Communications and Signal Processing

作者： Zanjie Huang Yusheng Ji Baohua Zhao School of Computer Science Univ. of Science and Technology of China Hefei Anhui 230027China Information Systems Architecture Science Research Division National Institute of Informatics Tokyo Japan

ISBN: (纸本)9781467358309

To achieve a higher data transmission rate, carrier aggregation (CA) technology has been included in the LTE Advanced standard. Allocating resources with CA is a crucial and challenging task due to the different types of user equipment (UE) that have different bandwidth capacities and operate under the same base station (BS). We have formulated the downlink resource allocation problem joining both carrier component (CC) allocation and resource block (RB) allocation to achieve proportional fairness in the long term. We also develop a maximum system utility (MSU) algorithm. Each time this algorithm tries to allocate the best CC to an narrow-band UE in which the number of CCs it is assigned does not exceed the number of CCs supported, maximizing the total utility until it can no longer grow. Importantly, NB UEs which can support more than one CCs are considered in this paper. Simulation results show that the proposed algorithm can significantly improve total throughput compared with the existing algorithm both with and without fairness consideration.

关键词： An Efficient Resource

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Wide-Area Power Oscillation Damper Implementation and Testing in the Norwegian Transmission Network

Wide-Area Power Oscillation Damper Implementation and Testin...

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IEEE Power and Energy Society General Meeting

作者： K. Uhlen L. Vanfretti M. M. de Oliveira A. B. Leirbukt V. H. Aarstrand J. O. Gjerde the Department of Electrical Power Engineering Faculty of Information Technology Mathematics and Electrical Engineering Norwegian University of Science and Technology (NTNU) O. S. Bragstads plass 2E N- 7034 Trondeim Norway the Electric Power Systems Division School of Electrical Engineering KTH Royal Institute of Technology Teknikringen 33 SE-100 44 Stockholm Sweden with ABB FACTS SE-721 V?ster°as Sweden A. Leirbukt is with ABB Power Systems Oslo Norway with the Norwegian TSO Statnett SF Research and Development Hysebybakken 28 B N-0302 Oslo Norway

ISBN: (纸本)9781467327275

This article reports the results from the implementation and testing of a Wide-Area Power Oscillation Damper (WAPOD) controlling a 180 Mvar TCR Static Var Compensator (SVC) installed in the Hasle substation of Norwegian 420 kV transmission grid. The WAPOD uses voltage phase angle signals from two distant locations in the Norwegian grid as inputs to the damping controller. The damping controller modulates the voltage reference set point used by the SVC’s voltage controller, thereby creating a damping effect. The WAPOD is an extension to the existing Power Oscillation Damping (POD) controller that uses local measurements. A switch-over logic allows for the use of no damping control, local damping control or wide-area control. Field tests were performed during November 2011, and involved the disconnection and re-connection of a 420 kV transmission line. The performance of the WAPOD is compared to that of state-of-the-art local Phasor POD, and when no damping control is enabled. The testing results show that the WAPOD performed satisfactorily and according to the design expectations. These results show that the potential flexibility of the WAPOD to choose, among the different PMU signals, those that have the good observability of inter-area modes can be an advantage to the use of local feedback signals for damping control, as it is current practice today. Further testing of this WAPOD with other PMU signals from locations with stronger observability will be helpful to illustrate the advantage of this flexibility.

关键词： Wide-Area Measurement systems Wide-Area Monitoring systems Wide-Area Control systems Wide-Area Power Oscillation Damping Nordic Power System damped control power oscillation absorption of shock Norwegian voltage reference transmission networks DAMPER Disconnection Phasor measurement units Flexibility

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Excitation method of linear-motor-type rail brake without using power sources by dynamic braking with zero electrical output

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IEEJ Transactions on Industry Applications 2011年第2期131卷 219-226+12页

作者： Sakamoto, Yasuaki Kashiwagi, Takayuki Hasegawa, Hitoshi Sasakawa, Takashi Fujii, Nobuo Maglev Systems Technology Division Railway Technical Research Institute 2-8-38 Hikari-cho Kokubunji 185-8540 Japan Dept. of Electrical and Electronic Systems Eng. Graduate School of Information Science and Electrical Engineering Kyushu University 744 Motooka Nishi-ku Fukuoka 819-0395 Japan

The eddy current rail brake is a type of braking system used in railway vehicles. Because of problems such as rail heating and problems associated with ensuring that power is supplied when the feeder malfunctions, this braking system has not been used for practical applications in Japan. Therefore, we proposed the use of linear induction motor (LIM) technology in eddy current rail brake systems. The LIM rail brake driven by dynamic braking can reduce rail heating and generate the energy required for self-excitation. In this paper, we present an excitation system and control method for the LIM rail brake driven by "dynamic braking with zero electrical output". The proposed system is based on the concept that the LIM rail brake can be energized without using excitation power sources such as a feeder circuit and that high reliability can be realized by providing an independent excitation system. We have studied this system and conducted verification tests using a prototype LIM rail brake on a roller rig. The results show that the system performance is adequate for commercializing the proposed system, in which the LIM rail brake is driven without using any excitation power source. © 2011 The institute of Electrical Engineers of Japan.

关键词： Rails

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Design considerations and experimental verification of a rail brake armature based on linear induction motor technology

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IEEJ Transactions on Industry Applications 2011年第1期131卷 127-134+17页

This paper describes the design considerations and experimental verification of an LIM rail brake armature. In order to generate power and maximize the braking force density despite the limited area between the armature and the rail and the limited space available for installation, we studied a design method that is suitable for designing an LIM rail brake armature;we considered adoption of a ring winding structure. To examine the validity of the proposed design method, we developed a prototype ring winding armature for the rail brakes and examined its electromagnetic characteristics in a dynamic test system with roller rigs. By repeating various tests, we confirmed that unnecessary magnetic field components, which were expected to be present under high speed running condition or when a ring winding armature was used, were not present. Further, the necessary magnetic field component and braking force attained the desired values. These studies have helped us to develop a basic design method that is suitable for designing the LIM rail brake armatures. © 2011 The institute of Electrical Engineers of Japan.

关键词： Brakes

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Non‐proportional/Non‐monotonous Deformation Modeling of an Ultra High Strength Automotive Steel Sheet

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AIP Conference Proceedings 2011年第1期1383卷 202-209页

作者： Rahul K. Verma Yuki Ogihara Toshihiko Kuwabara Kwansoo Chung aResearch and Development Division Tata Steel Limited Jamshedpur India bGraduate School of Mechanical Systems Engineering Tokyo University of Agriculture and Technology cInstitute of Symbiotic Science and Technology Division of Advanced Mechanical Systems Engineering Tokyo University of Agriculture and Technology dDepartment of Material Science and Engineering Research Institute of Advanced Materials Seoul National University

In this work, as non‐proportional/non‐monotonous deformation experiments, two‐stage and tension‐compression‐tension uniaxial tests were performed, respectively, for a cold rolled ultra high strength dual phase steel sheet: DP780. Deformation behaviors under such deformation paths were found different than those of the ultra low carbon single phase steels observed by Verma et al. (Int. J. Plast. 2011, 82–101). To model the newly observed deformation behaviors, the combined type constitutive law previously proposed by Verma et al. (Int. J. Plast. 2011, 82–101) was successfully applied here. Permanent softening observed during reverse loading was properly characterized into the isotropic and kinematic hardening parts of the hardening law using tension‐compression‐tension test data. The cross effect observed in two‐stage tests was also effectively incorporated into the constitutive law.

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Theoretical treatment of sink scheduling problem in wireless sensor networks

Theoretical treatment of sink scheduling problem in wireless...

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2011 IEEE Conference on Computer Communications Workshops, INFOCOM WKSHPS 2011

作者： Gu, Yu Ji, Yusheng Li, Jie Zhao, Baohua Information Systems Architecture Science Research Division National Institute of Informatics Tokyo Japan State Key Laboratory of Networking and Switching Technology Beijing 100876 China School of Computer Science Univ. of Science and Technology of China Hefei Anhui 230027 China Department of Computer Science University of Tsukuba Ibaraki 305-8573 Japan

ISBN: (纸本)9781457702488

Sink Scheduling, in the form of scheduling multiple sinks among sink sites to leverage traffic burden, is an effective mechanism for the energy-efficiency of wireless sensor networks (WSNs). Due to the inherent difficulty (NP-hard in general), existing works on this topic mainly focus on heuristic/greedy algorithms and theoretic results remain unknown. In this paper, we fill in the research blank with two algorithms. The first one is based on the Column Generation (CG). It decomposes the original problem into two sub problems and solve them iteratively to approach the optimal solution. However, due to its high computational complexity, this algorithm is only suitable for small scale networks. The other one is a polynomial-time algorithm based on relaxation techniques to obtain an upperbound, which can serve as a performance benchmark for other algorithms on this problem. Through comprehensive simulations, we evaluate the efficiency of proposed algorithms. © 2011 IEEE.

关键词： Wireless sensor networks

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Decision-guided self-architecting framework for integrated distribution and energy management

Decision-guided self-architecting framework for integrated d...

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2011 IEEE PES Innovative Smart Grid Technologies, ISGT 2011

作者： Arinez, Jorge Biller, Stephan Brodsky, Alexander Menascé, Daniel Shao, Guodong Sousa, João P. General Motors R and D Center Manufacturing Systems Research Lab. Warren MI United States Computer Science Department Volgenau School of Information Technology and Engineering George Mason University Fairfax VA United States Manufacturing Systems Integration Division National Institute of Standards and Technology Gaithersburg MD United States

ISBN: (纸本)9781612842189

The future success of the Smart Grid (SG) depends on many technological developments and innovations being created. The SG will be characterized by decentralized generation, improved network communications, demand response, greater reliability and robustness to failures. The future power grid will also have many interacting components needing greater capabilities to coordinate and manage power and information flows in as an efficient manner as possible. Though many power distribution engineering and analysis tools have been developed to operate the grid in a real-time manner, there are still areas requiring improved systems integration and decision-making. One such critical area that has great opportunity for improvement is at the interface between Distribution Management systems (DMS) operated by distribution utilities and Energy Management systems (EMS) operated by end consumers. This paper proposes the development of a set of technologies in the form of Decision-Guided Self-Architecting (DGSA) Framework whose purpose is to provide integrated, real-time optimal decision support in the common domain that intersects the operations of DMS and EMS. This is a key area requiring attention as the overall grid may be sub-optimized unless there is well-integrated and coordinated, optimal decision-making across the various power generating, distributing, and consuming entities of the SG. In addition, this paper also describes the supporting technologies upon which the framework is based and presents two key applications of the DGSA Framework: Energy Management systems and an Energy Investment Advisor. Also presented are two cases that each illustrate various scenarios for how the framework would be implemented and the type of decisions that would be made with such a framework. © 2011 IEEE.

关键词： Energy management systems

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