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IEEE Canadian Conference on electrical and computer engineering

作者： Mohamed Temam Nasri Witold Kinsner Cognitive Systems Laboratory Department of Electrical and Computer Engineering University of Manitoba Winnipeg Manitoba Canada

ISBN: (纸本)9781479931026

The design of an optimal and robust controller is critical for any application subjected to time delays between the start of an event at one point in a system and its resulting action at another point. This paper discusses and compares three different controllers, namely fuzzy, fractional-order and integer-order proportional integral derivative (FPID, IPID) controllers for the purpose of small satellites attitude control. This paper introduces the background knowledge related to the three different controllers. The second one evaluates their performance based on their ability to provide an optimal attitude control scheme for small satellites. The controllers are evaluated in the time-domain based on different performance measures (e.g., overshoot, transient response, and steady-state error). Simulation results illustrate the superiority of FPID over IPID and fuzzy controllers for this specific application and reinforces the power of fractional calculus in dealing with nonlinear systems.

关键词： PID controller integer-order PID (IPID) controller fractional calculus fractional-order PID (FPID) controller Mamdani fuzzy controller small satellites

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Joint User Scheduling and Antenna Selection in Distributed Massive MIMO systems with Limited Backhaul Capacity

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China Communications 2014年第5期11卷 17-30页

作者： XU Guozhen LIU An JIANG Wei XIANG Haige LUO Wu The State Key Laboratory of Advanced Optical Communication Systems and Networks Peking University China Department of Electrical and Computer Engineering Hong Kong University of Science and Technology Hong Kong China

Massive MIMO systems offer a high spatial resolution that can drastically increase the spectral and/or energy efficiency by employing a large number of antennas at the base station(BS).In a distributed massive MIMO system,the capacity of fiber backhaul that links base station and remote radio heads is usually limited,which becomes a bottleneck for realizing the potential performance gain of both downlink and *** solve this problem,we propose a joint antenna selection and user scheduling which is able to achieve a large portion of the potential gain provided by the massive MIMO array with only limited backhaul *** sub-optimal iterative algorithms with the objective of sumrate maximization are proposed for the joint optimization of antenna selection and user scheduling,either based on greedy fashion or Frobenius-norm *** and complexity analysis are presented for the *** provided Monte Carlo simulations show that,one of our algorithms achieves a good tradeoff between complexity and performance and thus is especially fit for massive MIMO systems.

关键词： massive MIMO limited backhaul capacity antenna selection user scheduling

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A virtual environment framework for embedding neural models

A virtual environment framework for embedding neural models

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29th International Conference on computers and Their Applications, CATA 2014

作者： Thibeault, Corey M. Srinivasa, Narayan Harris Jr., Frederick C. Center for Neural and Emergent Systems Information and Systems Sciences Laboratory HRL Laboratories LLC Malibu CA United States Department of Electrical and Biomedical Engineering University of Nevada Reno Reno NV United States Department of Computer Science University of Nevada Reno Reno NV United States

ISBN: (纸本)9781632665133

An important aspect of spiking neural network research is the implementation of environments and scenarios to develop and test novel theories of function and adaptation. In addition to embodying a model in the physical world, there are a number of strategies for virtually embedding neural models. Two popular approaches are using existing games or creating custom environments. Both of these however, can require significant software development in addition to the difficulty in creating compelling visual elements. The visual world can not only be the most time-consuming to develop but to render as well. Furthermore, it is often the most unnecessary aspect of the research. In this work we briefly explore using the entity system paradigm as the foundation of a generic framework for developing virtual environments independent of the visualization. This is contrasted with using an object-oriented approach for the same goal. The resulting framework not only simplifies the development of novel virtual environments but provides a higher level of code reuse.

关键词： Virtual reality

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Short-term temperature prediction in buildings using advanced data analysis techniques

Engineering Intelligent Systems

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engineering Intelligent systems 2015年第4期23卷 209-216页

作者： Carrasco, Juan J. Millán-Giraldo, Mónica Caravaca, Juan Díaz, Ignacio Sanchis, Javier Soria-Olivas, Emilio Intelligent Data Analysis Laboratory E.T.S.E University of Valencia Avda Universitat S/N Burjassot Valencia46100 Spain Electrical Engineering and Computer Systems Department University of Oviedo University Campus of Viesques Gijón Asturias33204 Spain Instituto Universitario de Automática e Informática Industrial Universitat Politécnica de Valencia Camino de Vera S/N Valencia46022 Spain

Reduction in energy consumption is of paramount importance due to the influence that it has on the economic, politics and on the use of natural resources. Within this field, energy efficiency in buildings sector constitutes one of the main concerns due to the fact that approximately 40% of total world energy consumption corresponds to this sector. Predicting the indoor temperature in advance can help to act more efficiently on Heating, Ventilation fans and Air Conditioning (HVAC) systems, and thus to reduce the consumption. This work tackles the application of machine learning methods to forecast indoor temperature in an office building, using several prediction horizons. The obtained results showed the validity of the used approximation. ©2015 CRL Publishing Ltd.

关键词： Energy efficiency

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Hybrid systems with Memory: Modelling and Stability Analysis via Generalized Solutions

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IFAC Proceedings Volumes 2014年第3期47卷 6019-6024页

作者： Jun Liu Andrew R. Teel Department of Automatic Control and Systems Engineering University of Sheffield Sheffield S1 3JD United Kingdom Center for Control Dynamical Systems and Computation and Department of Electrical and Computer Engineering University of California Santa Barbara CA 93106 USA

Hybrid systems with memory are dynamical systems exhibiting both hybrid and delay phenomena. We present a general modelling framework for such systems using hybrid functional inclusions, whose generalized solutions are defined on hybrid time domains and evolve in the phase space of hybrid memory arcs equipped with the graphical convergence topology. We prove a general existence result based on some basic conditions on the data of hybrid systems. We further establish sufficient conditions for the stability analysis of hybrid systems with memory using Lyapunov-Razumikhin (L-R) functions. We demonstrate the stability results on a general nonlinear system with switching dynamics and state jumps.

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Performance Assessment and Optimization of Motion Planning in a Surgical Trainer for Potential Space Applications

Performance Assessment and Optimization of Motion Planning i...

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IEEE Aerospace Conference

作者： Aakarsh Rao Minsik Hong Akash Shankaran Wolfgang Fink Jerzy Rozenblit Model Based Design Laboratory Department of Electrical & Computer Engineering University of Arizona Visual and Autonomous Exploration Systems Research Laboratory Systems Departments of Electrical & Computer Engineering Biomedical Engineering Systems & Industrial Engineering Aerospace & Mechanical Engineering Ophthalmology & Vision Science Universi Department of Surgery University of Arizona

ISBN: (纸本)9781479916191

Medical surgeries in the space environment, including long term space travel (e.g., to Mars) and permanent presence on other planetary bodies (e.g., Moon and Mars), are posing an inherent logistical, and in the absence of appropriately trained personnel (i.e., surgeons), even a potentially life-threatening challenge. As a potential mitigation the use of an existing surgical trainer tool that would allow crewmembers to acquire basic surgical skills is proposed, and to train space station personnel both in space and on the Moon and Mars to hone these skills long-term. Furthermore, this tool would potentially allow for tele-conducted surgeries, akin to the da Vinci Surgical System, controlled from Earth but executed onboard, e.g., the International Space Station. On Earth the surgical trainer can be used to train surgeons and flight surgeons. The efficiency of any surgical training system plays a significant role in its reduction of operative risks and stress associated with insufficient experience of the trainee. The primary goal of such systems is to raise the trainee to a higher level of proficiency without putting patients at risk in the operating room. The prototype for the computer Assisted Surgical Trainer (CAST) being developed at the University of Arizona realizes an optimal motion-planning algorithm. The underlying system consists of mechanical fixtures equipped with encoders and DC motors. This hardware provides a means to accurately track the tip movements of laparoscopic instruments used in minimally invasive surgery. Furthermore it provides haptic and visual feedback to trainees by using a PID controller and augmented reality visualization. Examples of surgical guidance and the improvement of surgeon performance over time using CAST are presented.

关键词： Surgery Instruments Training Visualization Haptic interfaces Space stations Aerospace electronics

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Ultraviolet Photodetector Fabricated from 3D WO3 Nanowires/Reduced Graphene Oxide Composite Material

Ultraviolet Photodetector Fabricated from 3D WO3 Nanowires/R...

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2013 MRS Fall Meeting

作者： Shao, Dali Yu, Mingpeng Lian, Jie Sawyer, Shayla Department of Electrical Computer and Systems Engineering Rensselaer Polytechnic Institute Troy NY 12180 United States Department of Mechanical Aerospace and Nuclear Engineering Rensselaer Polytechnic Institute Troy NY 12180 United States Department of Chemistry Laboratory of Bio-organic Phosphorus Tsinghua University Beijing 100084 China

An Ultraviolet (UV) photodetector with high responsivity and relative fast response speed was fabricated from three dimensional WO3 nanowires/reduced graphene oxide (3D WO3 NWs/RGO) composite materials. The 3D WO3 NDs/GN composite was synthesized using a facile three-step synthesis. First, the Na2WO4/Graphene Oxide (GO) precursor was synthesized by homogeneous precipitation. Second, the Na2WO4/GO precursor was transformed into H2WO4/GO composites by acidification. Finally, the H2WO4/GO composites were reduced to 3D WO3 NWs/RGO via hydrothermal reduction process. A maximum photoresponsivity of 4.2 A/W at 374 nm was observed under 20 V bias. The UV photodetector showed relative fast transient response, which is at least 2 orders of magnitude faster than UV photodetectors fabricated from WO3 nanowires. The good photoresponsivity and fast transient response are attributed to improved carrier transport and collection efficiency through graphene. Copyright © 2014 Materials Research Society.

关键词： Composite materials

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An adaptive predictive control strategy for RMPPT under partially shaded conditions 19

An adaptive predictive control strategy for RMPPT under part...

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19th IFAC World Congress on International Federation of Automatic control, IFAC 2014

作者： Ma, Chao Wu, Jing Li, Ning Li, Shaoyuan Li, Kang Department of Automation Shanghai Jiao Tong University Key Laboratory of System Control and Information Processing Ministry of Education of China Shanghai China School of Electronics Electrical Engineering and Computer Science Queen's University Belfast United Kingdom

ISBN: (纸本)9783902823625

As one of key technologies in photovoltaic converter control, Maximum Power Point Tracking (MPPT) methods can keep the power conversion efficiency as high as nearly 99% under the uniform solar irradiance condition. However, these methods may fail when shading conditions occur and the power loss can over as much as 70% due to the multiple maxima in I-P curve in shading conditions v.s. single maximum point in uniformly solar irradiance. In this paper, a Real Maximum Power Point Tracking (RMPPT) strategy under Partially Shaded Conditions (PSCs) is introduced to deal with this kind of problems. An optimization problem, based on a predictive model which will change adaptively with environment, is developed to tracking the global maxima and corresponding adaptive control strategy is presented. No additional circuits are required to obtain the environment uncertainties. Finally, simulations show the effectiveness of proposed method. © IFAC.

关键词： Adaptive control systems

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Reactive voltage control of bidirectional-interaction coordination between provincial and district power networks with wind power integration

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Dianli Xitong Zidonghua/Automation of Electric Power systems 2014年第24期38卷 48-55页

作者： Wang, Bin Guo, Qinglai Li, Haifeng Sun, Hongbin Tang, Lei Zhang, Boming State Key Laboratory of Control and Simulation of Power Systems and Generation Equipments Tsinghua University Beijing100084 China Department of Electrical Engineering Tsinghua University Beijing100084 China

An agile and coordinated voltage control method is proposed to deal with the power system reactive power and voltage operation with large scale wind power integration. In the provincial control center, the agile voltage control method with the wind power volatility and the power system N-1 security constraints taken into account is proposed. With this method, by means of the adaptive adjustment of the control period and control model, the wind farm reactive ability will be fully tapped to suppress the influence of wind fluctuations on the bus voltage while sufficient dynamic reactive power regulation margin of traditional generators will be retained. Between provincial and prefectural control centers, the bidirectional interaction based voltage control method is presented to support the voltage at the terminal power network while bypassing the unnecessary discrete device action on the prefectural grid. By coordinated voltage control among the wind farms and substations in the provincial power system, the control abilities of its own wind farms will be made full use of, there will be less capacitor and reactor action times in its own substations and unnecessary reactive power flow. By the bidirectional interaction between provincial and prefectural control centers, the distributed adjustment resources can well be used to support the voltage at the terminal power network and increase the safety and economy of overall operation of the power system. The wind automatic voltage control system is currently in real-time operation in Jiangsu power system. © 2014 State Grid Electric Power Research Institute Press.

关键词： Voltage control

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Development of a frequency dependent network equivalent based RTDS-TSA hybrid transient simulation platform with heterogeneous architecture

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Dianli Xitong Zidonghua/Automation of Electric Power systems 2014年第16期38卷 88-93页

作者： Hu, Yizhong Wu, Wenchuan Zhang, Boming Department of Electrical Engineering Tsinghua University Beijing100084 China State Key Laboratory of Control and Simulation of Power Systems and Generation Equipments Tsinghua University Beijing100084 China

For the simulation of large-scale AC/DC hybrid systems, both the precision of the DC parts and the efficiency of the whole system should be considered. Thus a real-time hybrid transient simulation platform is proposed by combining the real-time digital simulator (RTDS) and a transient stability analysis (TSA) program. A latest GTFPGA card is used to realize the high speed digital communication between RTDS and the computer deploying TSA program. Moreover, the frequency dependent network equivalent (FDNE) is implemented in this simulation platform to improve the accuracy of simulation results. By simulating a modified New England 39-bus test system incorporating high-voltage direct current (HVDC) components, the validity of the proposed simulation platform is verified.

关键词： Transient analysis

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