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Rural Off-Grid Electricity Service in Sub-Saharan Africa [Technology Leaders]

IEEE Electrification Magazine 2015年第1期3卷 7-15页

作者： Louie, Henry O'Grady, Elizabeth Van Acker, Vincent Szablya, Steve Kumar, Nirupama Prakash Podmore, Robin Department of Electrical and Computer Engineering Seattle University SeattleWA United States PowerGen Renewable Energy Nairobi Kenya Alstom Grid RedmondWA United States Wind Logics Next Era Energy MinneapolisMN United States Incremental Systems Corporation SeattleWA United States

Access to electricity is a persistent, endemic challenge impeding development in Sub-Saharan Africa. Decades of postcolonial underinvestment have resulted in just 80 GW of installed generation capacity?less than that of the United Kingdom?in a region with over 860 million people. Of the 20 countries with the lowest electrification rates in the world, 19 are found in Sub-Saharan Africa, where, on average, fewer than one in three people have access to electricity. In rural areas, electrification rates plummet to less than 15%. © 2013 IEEE.

关键词： Rural areas

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Stretchable Displays: Stretchable Active Matrix Inorganic Light‐Emitting Diode Display Enabled by Overlay‐Aligned Roll‐Transfer Printing (Adv. Funct. Mater. 11/2017)

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Advanced Functional Materials 2017年第11期27卷

作者： Minwoo Choi Bongkyun Jang Wonho Lee Seonwoo Lee Tae Woong Kim Hak‐Joo Lee Jae‐Hyun Kim Jong‐Hyun Ahn School of Electrical and Electronic Engineering Yonsei University 50 Yonsei‐ro Seodaemun‐Gu Seoul 03722 Republic of Korea Department of Nanomechanics Nano‐Convergence Mechanical Systems Research Division Korea Institute of Machinery & Materials (KIMM) 156 Gajeongbuk‐ro Yuseong‐gu Daejeon 34103 Republic of Korea Next Generation R&D Team 2 Display Research Center Samsung Display 1 Samsung‐ro Kiheung‐Gu Yongin 17113 Republic of Korea

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Conformai mapping applied to the estimate of Surge and Swab geopressures

Conformai mapping applied to the estimate of Surge and Swab ...

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International Conference on Environment and electrical engineering (EEEIC)

作者： Uyara F. Silva I. Q. Manoel Alan H. F. Silva Wesley P. Calixto Santiago Lemos Geovanne P. Furriel School of Electrical Mechanical and Computer Engineering Federal University of Goias (UFG) Goiania Brazil Experimental and Technological Research and Study Group (NExT) Federal Institute of Goias (IFG) Goiania Brazil Universidade Federal de Goias Goiania GO BR Program in Electronic Systems and Automation University of Brasilia (UnB) Brasilia Brazil Teaching and Research Center Applied to Education Federal University of Goias (UFG) Goiania Brazil

ISBN: (纸本)9781509023219

The purpose of this work is to calculate Surge and Swab pressure in oil wells with eccentricity between drill string and wellbore or casing string. Analysis of this phenomenon, in which the fluid is confined between two eccentric cylinders, are made. The conformal mapping is used to lead the eccentric domain into the concentric domain, since the usual models correspond to concentric geometries. The results of this study, using the proposed methodology, are presented and discussed.

关键词： Surges Geometry Stress Conformal mapping Mathematical model Indexes Liquids

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Securing cognitive radio enabled smart grid systems against cyber attacks

Securing cognitive radio enabled smart grid systems against ...

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International Conference on Anti-Cybercrime (ICACC)

作者： Mehak Basharat Waleed Ejaz Syed Hassan Ahmed Next Generation Wireless Networks Virtual Lab Toronto Canada Department of Electrical & Computer Engineering Queen's University Kivngston Canada School of Computer Science & Engineering Kyungpook National University Daegu Republic of Korea

Recently cognitive radio technology gets attention to enhance the performance of smart grid communication networks. In this paper, we present a cognitive radio enabled smart grid architecture. We then discuss major cyber security challenges in smart grid deployment and additional challenges introduced by cognitive radio technology. Spectrum sensing is one of the important aspect for opportunistic spectrum access in cognitive radio enabled smart grid networks. Cooperative spectrum sensing can improve the sensing performance in which multiple cognitive radio users cooperate to sense primary user bands. However, cooperative spectrum sensing is vulnerable to incumbent emulation and spectrum sensing data falsification (SSDF) attacks. Thus, we propose a two-stage scheme for defense against SSDF attacks. Simulation results show that the proposed two-stage scheme can identify and exclude the attackers accurately.

关键词： Smart grids Sensors Security Smart meters Cognitive radio Reliability

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Cooperative Control of Multiple Untethered Magnetic Microrobots Using a Single Magnetic Field Source

Cooperative Control of Multiple Untethered Magnetic Microrob...

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IEEE International Conference on Automation Science and engineering

作者： Nahum A. Torres Dan O. Popa Next Generation Systems Group Electrical Engineering Department University of Texas at Arlington

ISBN: (纸本)9781467381840

This paper presents a novel method of actuation for multiple untethered microrobots with a global magnetic field generated by a single conical permanent magnet. The microrobots in our experiments were chrome-steel spheres with a diameter size of 500 μm and cubical neodymium magnets of 250 μm and 500 μm in size. These robots can perform cooperative planar motions compatible with micromanipulation tasks such as grasping. The cooperative grasping behavior is produced by the magnetic field gradient controlled by the 5 DOF position of the conical permanent magnet with respect to the robots' workspace. The microrobots are also capable of swarming motion with a leader and formation following behavior. Simulation and experimental results are offered to validate the potential of this method for automation at the micro-scale.

关键词： Magnetic flux Robots Magnetic separation Force Magnetic resonance imaging Magnetic field measurement

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Robust mean-variance optimization for self-scheduling of thermal producer and its price of robustness

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Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of electrical engineering 2015年第2期35卷 319-326页

作者： Ding, Tao Bo, Rui Sun, Hongbin Huang, Can Li, Fangxing State Key Lab of Control and Simulation of Power Systems and Generation Equipment Department of Electrical Engineering Tsinghua University Haidian District Beijing100084 China Midwest ISO Street Paul MN55108 United States Department of Electrical Engineering and Computer Science University of Tennessee Knoxville TN37996 United States

In deregulated electricity markets, generation companies with the aim of maximum revenue need to provide trading strategies to the electricity trading market, which contributed to a self-scheduling model. When considering the uncertainty of price, the trading strategies are required to maximize the revenue as well as minimizing the risks brought by uncertainties. In this paper, a multi-objective robust mean-variance model was proposed to solve the above problem and the Pareto frontier of the multi-objective optimization was obtained. Moreover, the proposed robust mean-variance model could be equivalently transformed into a non-robust mean-variance model which was casted as a second-order cone programming (SOCP) optimization. The price of robustness to benefits, risks, and the Pareto frontier were analyzed. Finally, the robust mean-variance model based self-scheduling model optimization and its budget of robustness were tested on a 30-bus system. The simulation results demonstrate the effectiveness of the proposed method and analysis. © 2015 Chin. Soc. for Elec. Eng.

关键词： Second-order cone programming

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An SDN framework for seamless mobility in enterprise WLANs

An SDN framework for seamless mobility in enterprise WLANs

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IEEE International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC)

作者： Arkadeep Sen Krishna M. Sivalingam India-UK Advanced Technology Centre of Excellence in Next Generation Networks Systems and Services (IU-ATC) Chennai India Dept. of Computer Science and Engineering Indian Institute of Technology Madras Chennai India

With the proliferation of mobile devices, ubiquitous connectivity is becoming more and more desirable. Enterprise Wireless Local Area Network (WLAN) technologies provide such connectivity in several environments. In such deployments, configuration and management is done centrally using the vendor independent Control and Provisioning of Wireless Access Points (CAPWAP) protocol. However, the controllers provide little to no room for network programmability. In this paper, we propose a Software Defined Networking (SDN) framework for enterprise WLANs. This framework will provide network programmability allowing the network administrators to deploy customized applications for utilizing the WLANs. We also propose a seamless, client-unaware mobility mechanism which runs on the proposed framework.

关键词： Mobile handsets Wireless LAN Handover Probes Mobile communication Control systems

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SkinSim: A simulation environment for multimodal robot skin

SkinSim: A simulation environment for multimodal robot skin

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2014 IEEE International Conference on Automation Science and engineering, CASE 2014

作者： Habib, Ahsan Ranatunga, Isura Shook, Kyle Popa, Dan O. Electrical Engineering Department University of Texas at Arlington Next Generation Systems Group 416 Yates Street ArlingtonTX76010 United States

ISBN: (纸本)9781479952830

Robotic skin with embedded pressure, temperature, and distance sensors are increasingly useful in safe and intuitive human-robot collaboration scenarios. Design problems for distributed arrays of skin sensors. Such as placement, optimizing resolution, networking, and use in feedback loops are difficult to solve, and highly dependent on the application. In this paper we describe SkinSim, a new simulator framework for multi-modal, multi-resolution robot skin, aimed at solving complex design problems. SkinSim is implemented using the ROS and Gazebo simulation infrastructures which are supported by the Open Source Robotics Foundation, and therefore will be shared with the community. Here we describe the overall architecture of SkinSim and its use in sensor fusion and feedback control during physical human-robot interaction. In a case study, the response of a physical tactile sensor was experimentally characterized and the corresponding reduced-order models were implemented in the simulation environment. © 2014 IEEE.

关键词： Human robot interaction

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Repowering of a synchronous generation plant by induction generator

Repowering of a synchronous generation plant by induction ge...

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CHILEAN Conference on electrical, Electronics engineering, Information and Communication Technologies (CHILECON)

作者： Alana S. Magalhaes C. A. Leovir Calebe A. Matias Alan H. F. Silva Elder G. Domingues Aylton. J. Alves Wesley P. Calixto Program in Electronic Systems and Automation University of Brasilia (UnB) Brasília Brazil Experimental and Technological Research and Study Group (NExT) Federal Institute of Goias (IFG) Goiânia Brazil School of Electrical Mechanical and Computer Engineering Federal University of Gouias (UFG) Goiânia Brazil

ISBN: (纸本)9781467387576

This work proposes itself through mathematical modeling, simulating the electrical interactions between two electrical generators, an induction generator and a synchronous generator connected to a common bus in steady state, subject to non-linear load. By comparing the modeling of the two machines, we can see that the induction generator will present best way for the harmonic currents flowing in common bus. Experimental tests have confirmed the results of comparative modeling of the electric generators. It was evident that the induction generator, in addition to increasing the active power to the electrical system, could reduce current harmonics components present at the connection point improving the voltage profile in the network.

关键词： Induction generators Harmonic analysis Synchronous generators Power system harmonics Reactive power

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Learning human-like facial expressions for Android Phillip K. Dick

Learning human-like facial expressions for Android Phillip K...

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2014 IEEE International Conference on Automation Science and engineering, CASE 2014

作者： Habib, Ahsan Das, Sumit K. Bogdan, Ioana-Corina Hanson, David Popa, Dan O. University of Texas at Arlington Electrical Engineering Department Next Generation Systems Group 416 Yates Street ArlingtonTX76010 United States Hanson Robotics Inc DallasTX United States

ISBN: (纸本)9781479952830

Android robots with human-like appearance can engage in superior conversational interaction with humans due to their ability to generate expressive faces. In this paper we describe a learning algorithm to map the rich facial features of a human to an Android, capable of replicating them. The methodology we employ is automated, marker-less, and has a high degree of generality. As a result, it can be applied to any Android face design, not just those exploiting linear or decoupled relationships between actuator inputs and facial feature point motions. To ensure robust results, we employed a genetic algorithm to search the actuator space and generate a rich set of robot facial expressions. Experimental results clearly show that once learning is complete, accurate facial expressions for the Phillip K. Dick Android can be achieved by mimicking those of a human. © 2014 IEEE.

关键词： Actuators

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