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IEEE Annual Conference on Decision and control

作者： B. Shafai A. Oghbaee T. Tanaka department of Electrical and computer Engineering Northeastern University Boston MA 02115 USA LIDS (Laboratory for Information and Decision Systems) Massachusetts Institute of Technology Cambridge MA 02139 USA

ISBN: (纸本)9781467360890

This paper considers the problem of positive stabilization of uncertain linear time-delay systems by state feedback such that the resulting closed-loop system attains maximum stability radius with positivity constraint. First, we focus on the class of linear continuous-time positive delay systems (Metzlerian delay systems) and outline its interesting properties. Using the stability properties associated with this class, we formulate a constrained stabilization problem for the linear time delay system and provide conditions for the existence of controllers satisfying the stability and Metzlerian constraints. The Metzlerian stabilization is solved using Linear Matrix Inequality (LMI) or Linear Programming (LP). Next, we characterize the uncertainties associated with the positive delay systems and define the stability radius associated with this class which can be expressed in a closed form. Finally, we combine Metzlerian stabilization with maximum stability radius with the aid of bounded real lemma (BRL) and provide a complete solution using LMI. Examples are included for the purpose of illustration.

关键词： Delay systems linear time-delay system uncertain linear time-delay systems State feedback Induction loop systems

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Resource sharing for device-to-device communications underlaying full-duplex cellular networks

Resource sharing for device-to-device communications underla...

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International Conference on Communication systems

作者： Tinghan Yang Rongqing Zhang Xiang Cheng Liuqing Yang School of Electronics Engineering and Computer Science Peking University Beijing China State Key Laboratory of Rail Traffic Control and Safety Beijing Jiaotong University Department of Electrical and Computer Engineering Colorado State University Fort Collins CO USA

ISBN: (纸本)9781479958337

In this paper, we investigate the resource sharing problem to optimize the system performance in device-to-device(D2D) communications underlaying full-duplex cellular networks. In the investigated scenario, D2D links, cellular uplinks and cellular downlinks are permitted to reuse the same spectrum resources under efficient interference control, leading to a more complicated interference relationship among the communications links when maximizing the network throughput via resource sharing. Therefore, we employ an interference graph to model the considered interference scenario, in which different communication links and the interference relationships among them are represented by the vertices and edges in the constructed interference graph, respectively. Then, we further propose a graph coloring based resource allocation scheme which can effectively allocate the spectrum resources to the communication links in order to maximize the network throughput with low computational complexity. Simulation results show that when allowing for the resource sharing among D2D links, cellular uplinks, and cellular downlinks, the network throughput can be effectively improved and our proposed scheme can solve this complicated resource sharing problem with low complexity and efficient resource allocation solutions.

关键词： Interference Resource management Uplink Downlink Gold Throughput Color

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Sharpening Timing-Metrics for Auto-Correlation Based Coarse Symbol Synchronization in OFDM systems

Sharpening Timing-Metrics for Auto-Correlation Based Coarse ...

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IEEE International Conference on Communications

作者： Fan Yang Xi Zhang School of Communication and Information Engineering University of Electronic Science and Technology of China Chengdu China Department of Electrical and Computer Engineering Texas A&M University Networking and Information Systems Laboratory TX USA

The auto-correlation based coarse symbol timing scheme yields good correlation timing-metric for wireless orthogonal frequency division multiplexing (OFDM) systems under independent Rayleigh fading channels. However, it generates a plateau in its timing-metric due to the structure of the preamble added with cyclic prefix (CP). Inherently, the mean square error (MSE) performance of a coarse symbol timing scheme is closely related to the sharpness of its main-lobe timing-metric. Some of the literatures focus on polishing the auto-correlation timing-metrics to find the frame start point. One of the well-known methods uses arithmetic mean of the auto-correlation timing-metrics to generate a peak after post-processing. We propose a post-processing scheme using weighted arithmetic mean of the auto-correlation timing-metrics, and provide a different viewpoint of analyzing the performance of post-processing schemes in additive white Gaussian noise (AWGN) channels, which may be helpful in timing-metric design. By using the knowledge of root mean square (rms) delay spread, we get a general coarse symbol timing scheme for both AWGN and Rayleigh fading channels. The obtained simulation results indicate that the MSE performance of the post-processing scheme is a function of the main-lobe sharpness.

关键词： OFDM Delays AWGN channels Correlation Fading

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Epitaxial growth of NaCl on Fe (100) and characterization of Fe/NaCl/Fe magnetic tunnel junctions

Epitaxial growth of NaCl on Fe (100) and characterization of...

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IEEE Conference on Nanotechnology

作者： Yuan-Tao Ji Qiang Li Yong-Chao Tang Lin Li Guo-Xing Miao State Key Laboratory for Manufacturing Systems Engineering and Systems Engineering Institute Xi’an Jiaotong University Xi’an China The Key Laboratory of Embedded System and Service Computing Ministry of Education Tongji University Shanghai China Department of Electrical and Computer Engineering New Jersey Institute of Technology Newark NJ USA

ISBN: (纸本)9781479956234

Growth of NaCl and Fe/NaCl/Fe Magnetic tunneling junctions on Si (100) has been achieved by using a high vacuum electron-beam deposition system. Epitaxial tunnel junctions turn out to be prone to pinholes as well as electrode oxidation. Instead, the best tunneling magnetoresistance we have achieved in this system is on polycrystalline tunnel barriers with thin Mg insertion, and reaching 22.3% at room temperature.

关键词： Iron Junctions Magnetic tunneling Epitaxial growth Tunneling magnetoresistance Electrodes Silicon

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Using high-level synthesis to build memory and datapath optimized DSP accelerators

Using high-level synthesis to build memory and datapath opti...

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IEEE International Conference on Electronics, Circuits and systems (ICECS)

作者： Dionysios Diamantopoulos George Economakos Dionysios Reisis National Technical University of Athens School of Electrical and Computer Engineering Microprocessors and Digital Systems Laboratory Zografou Athens Greece Physics Department Electronics Laboratory National and Kapodistrian University of Athens Zografou Athens Greece

High-Level Synthesis (HLS) has been a hot research topic for more than 30 years. During this long period, HLS has found many enthusiasts and also critics as well. Both of them have presented a lot of arguments for and against, which have helped HLS mature a lot. Modern HLS environments are not restricted to heuristic optimizations of abstract functional blocks (adders and multipliers) as early approaches where, but are supported by rich, technology characterized component libraries, are integrated with other tool flows for simulation, synthesis, verification and prototyping, and their output can be efficiently installed in advanced multicore System-on-Chip (SoC) architectures. As a consequence, the optimization objectives are no longer only the number of abstract components, but technology dependent real implementation measurements, taken in a fast and accurate manner. In this paper, a modern HLS environment is used to investigate different architecture alternatives for the design of Digital Signal Processing (DSP) hardware accelerators, taking into account both memory and datapath component utilization, as well as SoC connectivity opportunities. The whole investigation is performed at the algorithmic level, using algorithmic constructs and directives to describe different architectural options in an abstract yet precise and high productive way. Experimental results show that correct architectural option selections can lead to more than 100X speedup, with little (practical negligible) resource utilization overhead.

关键词： Table lookup Hardware System-on-chip Field programmable gate arrays Software Digital signal processing

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PI controller design for Network control system based on minimum entropy control

PI controller design for Network control system based on min...

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2014 IEEE International Conference on Service Operations and Logistics,and Informatics

作者： Xinlan-Guo Tao-Li Hongxia Zhao Mechanical and Electrical Engineering Department Nanjing Communications Institute of Technology Enterprise Custom Department Huawei Nanjing Institute The State Key Laboratory of Management and Control for Complex Systems Institute of Automation Chinese Academy of Sciences

This paper designs PI controller which is easy to operate in an actual random framework for NCS,for nonlinear ARMAX model is difficult to achieve in the practical *** on the nature of the network control system is a random system and PI controller design is easy to operate in an actual random framework for NCS,the iterative learning ideas to batch control system output probability density function,so that the output probability density function of the system with increasing batch tracking a given probability density *** order to achieve the NCS system of tracking error probability density function control,this paper introduces the minimum entropy control algorithm.

关键词： minimum entropy control NCS PI controller.

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Fabrication and characterization of a GaN/(4H)SiC vertical pn power diode using direct and interfaced epitaxial-growth approaches

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Journal of Semiconductors 2013年第4期34卷 20-23页

作者： Bose Srikanta Mazumder S K Laboratory for Energy and Switching-Electronics Systems Department of Electrical and Computer EngineeringUniversity of Illinois at ChicagoChicagoIL:60607USA

We report the fabrication and characterization of a vertical pn power diode which is realized using two separate epitaxial-growth mechanisms：（a） p-GaN over p-（4H）SiC, and （b） p-GaN over n-（4H）SiC with A1N as the interface layer. In all of the cases, n＋-doped （4H）SiC serves as the cathode substrate. Pd（200 A）/Au（10000 A） is used for the anode contact while Ni（1000A） is used for the bottom cathode contact. The measured forward drop of the pn diode with A1N as the interface material is found to be around 5.1 V; whereas, it is 3 V for the other sample structure. The measured reverse-blocking voltage is found to be greater than 200 V.

关键词： GaN （4H）SiC vertical pn power diode power electronics

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Continuous-variable measurement-device-independent quantum key distribution

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Physical Review A 2014年第5期89卷 052301-052301页

作者： Zhengyu Li Yi-Chen Zhang Feihu Xu Xiang Peng Hong Guo State Key Laboratory of Advanced Optical Communication Systems and Networks School of Electronics Engineering and Computer Science and Center for Quantum Information Technology Peking University Beijing 100871 China Center for Computational Science and Engineering Peking University Beijing 100871 China State Key Laboratory of Information Photonics and Optical Communications Beijing University of Posts and Telecommunications Beijing 100876 China Centre for Quantum Information and Quantum Control Department of Physics and Department of Electrical and Computer Engineering University of Toronto Toronto Ontario Canada M5S 3G4

We propose a continuous-variable measurement-device-independent quantum key distribution (CV-MDI QKD) protocol, in which detection is conducted by an untrusted third party. Our protocol can defend all detector side channels, which seriously threaten the security of a practical CV QKD system. Its security analysis against arbitrary collective attacks is derived based on the fact that the entanglement-based scheme of CV-MDI QKD is equivalent to the conventional CV QKD with coherent states and heterodyne detection. We find that the maximal total transmission distance is achieved by setting the untrusted third party close to one of the legitimate users. Furthermore, an alternate detection scheme, a special application of CV-MDI QKD, is proposed to enhance the security of the standard CV QKD system.

关键词： QUANTUM theory QUANTUM mechanics QUANTUM entanglement QUANTUM coherence HETERODYNE detection QUANTUM fluctuations

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Formation Merging control in 3D under Directed and Switching Topologies

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IFAC Proceedings Volumes 2014年第3期47卷 10036-10041页

作者： Tingrui Han Zhiyun Lin Minyue Fu College of Electrical Engineering Zhejiang University 38 Zheda Road Hangzhou 310027 P. R. China State Key Laboratory of Industrial Control Technology and College of Electrical Engineering Zhejiang University 38 Zheda Road Hangzhou 310027 P. R. China School of Electrical Engineering and Computer Science University of Newcastle Callaghan NSW 2308 Australia Department of Control Science and Engineering Zhejiang University 38 Zheda Road Hangzhou 310027 P. R. China

The paper studies the formation merging problem for a leader-follower network. That is, how to control a team of agents called followers so that they are merged with a team of agents called leaders to form a larger globally rigid formation. Under the premise that a group of leaders move in a globally rigid formation with their synchronized velocity known to the followers, we show that the followers can asymptotically merge themselves to the formation for arbitrarily initial configurations. Each follower selects its neighbors and also its control law according to the target formation they aim to achieve and thus it allows directed and time-varying switching topologies. It is shown that a globally rigid formation can be merged asymptotically for the leader-follower network in a setup with directed and time-varying graphs if and only if every follower frequently has a joint path from at least a leader.

关键词： Multi-agent systems formation control leader-follower networks

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Implementation and test of human-operated and human-like adaptive impedance controls on Baxter robot

Implementation and test of human-operated and human-like ada...

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15th Annual Conference on Advances in Autonomous Robotics systems, TAROS 2014

作者： Liang, Peidong Yang, Chenguang Wang, Ning Li, Zhijun Li, Ruifeng Burdet, Etienne Centre for Robotics and Neural Systems School of Computing and Mathematics Plymouth University United Kingdom MOE Key Lab. of Autonomous System and Network Control College of Automation Science and Engineering South China University of Technology China State Key Laboratory of Robotics and System Harbin Institute of Technology China Department of Computer Science and Engineering Chinese University of Hong Kong Hong Kong Department of Bioengineering Imperial College of Science Technology and Medicine London United Kingdom

ISBN: (纸本)9783319104003

This paper presents an improved method to teleoperate impedance of a robot based on surface electromyography (EMG) and test it experimentally. Based on a linear mapping between EMG amplitude and stiffness, an incremental stiffness extraction method is developed, which uses instantaneous amplitude identified from EMG in a high frequency band, compensating for non-linear residual error in the linear mapping and preventing muscle fatigue from affecting the control. Experiments on one joint of the Baxter robot are carried out to test the approach in a disturbance attenuation task, and to compare it with automatic human-like impedance adaptation. The experimental results demonstrate that the new human operated impedance method is successful at attenuating disturbance, and results similarly to as automatic disturbance attenuation, thus demonstrating its efficiency. © 2014 Springer International Publishing.

关键词： Stiffness

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