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2016 International Conference on Industrial engineering and engineering Management, IEEM 2016

作者： Ferreira, Paulo A. Ferreira, João P. Crisóstomo, Manuel Coimbra, A. Paulo Institute of Systems and Robotics Dept. of Electrical and Computer Engineering University of Coimbra Portugal Department of Electrical Engineering Superior Institute of Engineering of Coimbra Coimbra Portugal

ISBN: (纸本)9781509036653

This paper presents a low cost system for human gait analysis. Two opposite-faced web cameras are used to acquire images of the walking of a person carrying a set of passive marks, where the color is chosen to contrast with the ambient dominant color. It is also used a treadmill with passive marks, where the user walks at different speeds. The acquired trajectories of the marks are used to determine body joint angles and other 3D crossed angles, obtained by both opposite sides from video images processing. With this low cost measurement system the analysis and reconstruction of human gait can be done with a mean error of 2 degrees, becoming a good alternative to more expensive systems to be used in human gait characterization. The system can be used to detect human gait pathologies and to accomplish physical rehabilitation. © 2016 IEEE.

关键词： Cost benefit analysis

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Gene expression imputation across multiple brain regions provides insights into schizophrenia risk (vol 51, pg 659, 2019)

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NATURE GENETICS 2019年第6期51卷 1068-1068页

作者： Huckins, Laura M. Dobbyn, Amanda Ruderfer, Douglas M. Hoffman, Gabriel Wang, Weiqing Pardinas, Antonio F. Rajagopal, Veera M. Als, Thomas D. Nguyen, Hoang T. Girdhar, Kiran Boocock, James Roussos, Panos Fromer, Menachem Kramer, Robin Domenici, Enrico Gamazon, Eric R. Purcell, Shaun Demontis, Ditte Borglum, Anders D. Walters, James T. R. O'Donovan, Michael C. Sullivan, Patrick Owen, Michael J. Devlin, Bernie Sieberts, Solveig K. Cox, Nancy J. Im, Hae Kyung Sklar, Pamela Stahl, Eli A. Pamela Sklar Division of Psychiatric Genomics Icahn School of Medicine at Mount Sinai New York NY USA Department of Genetics and Genomics Icahn School of Medicine at Mount Sinai New York NY USA Department of Psychiatry Icahn School of Medicine at Mount Sinai New York NY USA Icahn Institute for Genomics and Multiscale Biology Icahn School of Medicine at Mount Sinai New York NY USA Vanderbilt University Medical Center Nashville TN USA MRC Centre for Neuropsychiatric Genetics and Genomics Cardiff University Cardiff UK Department of Biomedicine Aarhus University Aarhus Denmark The Lundbeck Foundation Initiative for Integrative Psychiatric Research iPSYCH Denmark Center for Integrative Sequencing Aarhus University Aarhus Denmark Department of Human Genetics David Geffen School of Medicine University of California Los Angeles Los Angeles CA USA Human Brain Collection Core National Institute of Mental Health Bethesda MD USA Laboratory of Neurogenomic Biomarkers Centre for Integrative Biology (CIBIO) University of Trento Trento Italy Clare Hall University of Cambridge Cambridge UK University of North Carolina at Chapel Hill Chapel Hill NC USA Karolinska Institutet Stockholm Sweden Department of Psychiatry University of Pittsburgh Pittsburgh PA USA Systems Biology Sage Bionetworks Seattle WA USA Section of Genetic Medicine Department of Medicine University of Chicago Chicago IL USA Integrated Technology Research Laboratories Pharmaceutical Research Division Takeda Pharmaceutical Company Limited Fujisawa Japan Neuropsychiatry Section Department of Psychiatry Perelman School of Medicine University of Pennsylvania Philadelphia PA USA Neuropsychiatric Signaling Program Department of Psychiatry Perelman School of Medicine University of Pennsylvania Philadelphia PA USA Psychiatry JJ Peters Virginia Medical Center Bronx NY USA Department of Neuroscience Icahn School of Medicine at Mount Sinai New York New York NY USA Friedman Brain Institute

Transcriptomic imputation approaches combine eQTL reference panels with large-scale genotype data in order to test associations between disease and gene expression. These genic associations could elucidate signals in complex genome-wide association study (GWAS) loci and may disentangle the role of different tissues in disease development. We used the largest eQTL reference panel for the dorso-lateral prefrontal cortex (DLPFC) to create a set of gene expression predictors and demonstrate their utility. We applied DLPFC and 12 GTEx-brain predictors to 40,299 schizophrenia cases and 65,264 matched controls for a large transcriptomic imputation study of schizophrenia. We identified 413 genic associations across 13 brain regions. Stepwise conditioning identified 67 non-MHC genes, of which 14 did not fall within previous GWAS loci. We identified 36 significantly enriched pathways, including hexosaminidase-A deficiency, and multiple porphyric disorder pathways. We investigated developmental expression patterns among the 67 non-MHC genes and identified specific groups of pre- and postnatal expression.

关键词： Gene expression Genome-wide association studies Schizophrenia Transcriptomics

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Comparison of Different Cooling Fan Designs for Electric Motors

Comparison of Different Cooling Fan Designs for Electric Mot...

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IEEE International Electric Machines and Drives Conference

作者： Michele Roffi Fernando J. T. E. Ferreira Anibal T. De Almeida Institute of Systems and Robotics Department of Electrical and Computer Engineering University of Coimbra

ISBN: (纸本)9781509042821

Worldwide electric motor market is moving towards Premium/IE3, Super-Premium/IE4 and Ultra-Premium/IE5 efficiency classes. Therefore, motor manufacturers are constantly improving the overall design of three-phase asynchronous and synchronous motors and all the details with impact in the losses count, even if, individually, they just lead to efficiency gains of a fraction of a percentage point. In industry, most of the self-ventilated motors are driving unidirectional applications, such as fans, pumps, and compressors, and, therefore, the replacement of the typical bidirectional centrifugal fans of the external cooling system with a unidirectional axial fan may lead to a decrease in the acoustic noise and to a gain in the overall motor efficiency. In this paper, numerical simulations and experimental tests of different designs of axial fans and the respective comparison with the traditional centrifugal fans are presented. The tested axial fan prototypes were printed in plastic using a 3D printer. One of the novel axial fan designs led to a slight gain in the motor efficiency, maintaining the same operating temperature. That axial fan can be further optimized in order to require less power, have a better dynamic airflow, and produce less acoustic noise.

关键词： Acoustic noise Axial fan Centrifugal fan CFD Cooling fan Electric motors Fan-cooled motors Motor energy efficiency Self-ventilated motors Self-cooled motors

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3D Object Tracking using RGB and LIDAR Data

3D Object Tracking using RGB and LIDAR Data

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IEEE International Conference on Intelligent Transportation systems

作者： Alireza Asvadi Pedro Girao Paulo Peixoto Urbano Nunes Institute of Systems and Robotics (ISR) Department of Electrical and Computer Engineering (DEEC) University of Coimbra

ISBN: (纸本)9781509018901

Object tracking is one of the key components of the perception system of autonomous cars and ADASs. With tracking, an ego-vehicle can make a prediction about the location of surrounding objects in the next time epoch and plan for next actions. Object tracking algorithms typically rely on sensory data (from RGB cameras or LIDAR). In fact, the integration of 2D-RGB camera images and 3D-LIDAR data can provide some distinct benefits. This paper proposes a 3D object tracking algorithm using a 3D-LIDAR, an RGB camera and INS (GPS/IMU) sensors data by analyzing sequential 2D-RGB, 3D point-cloud, and the ego-vehicle's localization data and outputs the trajectory of the tracked object, an estimation of its current velocity, and its predicted location in the 3D world coordinate system in the next time-step. Tracking starts with a known initial 3D bounding box for the object. Two parallel mean-shift algorithms are applied for object detection and localization in the 2D image and 3D point-cloud, followed by a robust 2D/3D Kalman filter based fusion and tracking. Reported results, from both quantitative and qualitative experiments using the KITTI database demonstrate the applicability and efficiency of the proposed approach in driving environments.

关键词： red-green-blue colour model Lidar two dimentional images Cameras Current velocity Object detection Three Dimensions tracking objects

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Rewinding strategy aided by FEA as a solution to increase efficiency of industrial motors 22

Rewinding strategy aided by FEA as a solution to increase ef...

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22nd International Conference on electrical Machines, ICEM 2016

作者： Aguiar, V.P.B. Pontes, R.S.T. Neto, T. R. Fernandes Ferreira, F.J.T.E. Motor Driven Systems Laboratory Department of Electrical Engineering Federal University of Ceará Fortaleza CE60440554 Brazil Institute of Systems and Robotics Department of Electrical and Computer Engineering University of Coimbra Coimbra Portugal

ISBN: (纸本)9781509025381

This paper presents a proper model and methodology to improve the efficiency class of a squirrel-cage induction motor during rewinding. The modeling approach is based on the finite element model, i.e. two-dimensional model coupled with the rotor equivalent circuit (first stage) and the stator equivalent circuit (second stage). Results obtained with finite element analysis are compared with those obtained with analytical calculations. It is demonstrated that, during rewinding, if an improved winding configuration is used, efficiency gains can be obtained, allowing to improve the efficiency class of the motor, from IE2 to IE3, respecting the specified limits of NEMA & IEC performance indicators, namely, breakdown torque, locked-rotor torque, and locked-rotor current. In 79% of the simulated cases the efficiency gain allowed the studied motor to reach the IE3 class. © 2016 IEEE.

关键词： Frequency domain analysis

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A contribution of demand response for the reliability of a power system 16

A contribution of demand response for the reliability of a p...

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16th International Conference on Environment and electrical engineering, EEEIC 2016

作者： Gaspar, Claudia Gomes, Alvaro Institute of Systems and Robotics Department of Electrical and Computer Engineering University of Coimbra Coimbra3030-290 Portugal INESC Coimbra Department of Electrical and Computer Engineering University of Coimbra Coimbra3030-290 Portugal

ISBN: (纸本)9781509023196

Reliability is a crucial issue in modern power systems, being, in simple words, the ability to continuously and efficiently supply loads without neglecting the quality of service while keeping the power grid stable. In general, reliability can be improved by using more reliable components (generators) or by adding redundancy, being this extra generation known as reserves. Insufficient reserve margin may originate instability and severe problems in power systems. Adequacy is related with the provision of sufficient generation resources to meet the demand and the reserves requirements. The higher the redundancy level the higher the costs, thus a trade-off between the reliability degree and the investment requirements is needed. In this work is investigated if controllable demand can be actively used as an alternative to generation units for guaranteeing adequate reliability indices in short term operation of power systems. The goal is assessing the feasibility of using demand side resources-controllable demand-instead of generation for improving the reliability indices. An evolution strategy has been implemented to design adequate control actions, to be applied over end-use loads, and their impacts on the reliability indices have been assessed. The obtained results showed that, when adequately designed, demand control actions can effectively contribute for a more reliable operation of the power system, being an alternative to the redundant generation in short term. © 2016 IEEE.

关键词： Redundancy

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Selective strong structural minimum cost resilient co-design for regular descriptor linear systems

arXiv

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arXiv 2017年

作者： Popli, Nipun Pequito, Sérgio Kar, Soummya Pedro Aguiar, A. Ilić, Marija Department of Electrical and Computer Engineering Carnegie Mellon University PittsburghPA15213 United States Department of Electrical and Systems Engineering School of Engineering and Applied Science University of Pennsylvania PhiladelphiaPA19104 United States Institute for System and Robotics Instituto Superior Técnico University of Lisbon Lisbon Portugal Porto Portugal

This paper addresses the problem of minimum cost resilient actuation-sensing-communication co-design for regular descriptor systems while ensuring selective strong structural system's properties. More specifically, the problem consists of determining the minimum cost deployment of actuation and sensing technology, as well as communication between the these, such that decentralized control approaches are viable for an arbitrary realization of regular descriptor systems satisfying a pre-specified selective structure, i.e., some entries can be zero, nonzero, or either zero/nonzero. Towards this goal, we rely on strong structural systems theory and extend it to cope with the selective structure that casts resiliency/robustness properties and uncertainty properties of system's model. Upon such framework, we introduce the notion of selective strong structural fixed modes as a characterization of the feasibility of decentralized control laws. Also, we provide necessary and sufficient conditions for this property to hold, and show how these conditions can be leveraged to determine the minimum cost resilient placement of actuation-sensing-communication technology ensuring feasible solutions. In particular, we study the minimum cost resilient actuation and sensing placement, upon which we construct the solution to our problem. Finally, we illustrate the applicability the main results of this paper on an electric power grid example. Copyright © 2017, The Authors. All rights reserved.

关键词： Describing functions

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Dynamics over signed networks

arXiv

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arXiv 2017年

作者： Shi, Guodong Altafini, Claudio Baras, John S. Australian Center for Field Robotics School of Aerospace Mechanical and Mechatronic Engineering University of Sydney NSW Australia Division of Automatic Control Department of Electrical Engineering Linköping University LinköpingSE-58183 Sweden Institute for Systems Research Department of Electrical and Computer Engineering University of Maryland College ParkMD20742 United States

A signed network is a network with each link associated with a positive or negative sign. Models for nodes interacting over such signed networks, where two different types of interactions take place along the positive and negative links, respectively, arise from various biological, social, political, and economic systems. As modifications to the conventional DeGroot dynamics for positive links, two basic types of negative interactions along negative links, namely the opposing rule and the repelling rule, have been proposed and studied in the literature. This paper reviews a few fundamental convergence results for such dynamics over deterministic or random signed networks under a unified algebraic-graphical method. We show that a systematic tool of studying node state evolution over signed networks can be obtained utilizing generalized Perron-Frobenius theory, graph theory, and elementary algebraic recursions. Copyright © 2017, The Authors. All rights reserved.

关键词： Algebra

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Influence of slot geometry on air gap magnetic flux density of rotating machines 16

Influence of slot geometry on air gap magnetic flux density ...

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16th International Conference on Environment and electrical engineering, EEEIC 2016

作者： De Lima, Rodrigo Alves Coimbra, A. C. Paulo Almeida, Tony Gomes, Viviane Margarida Pereira, Thiago Martins Alves, Aylton Jose Calixto, Wesley Pacheco Program in Electronic Systems and Automation PGEA Department of Electrical Engineering ENE University of Brasilia UnB Brazil Institute of Systems and Robotics ISR University of Coimbra UC Portugal Experimental and Technological Research and Study Group NExT Federal Institute of Goias IFG Brazil

ISBN: (纸本)9781509023196

The objective of this work is to investigate the influence of slotted air gap constructive parameters on magnetic flux density of rotating machines. For this purpose, different approaches were used to solve the air gap field diagram using finite element method and the magnetic field distribution uniformity was evaluated by Carter's factor calculation. Sensitivity analysis of slot constructive parameters was performed and results show that slot geometry modifies the magnetic flux on air gap and shifts the air gap magnetic equipotential midline of double slotted machines. © 2016 IEEE.

关键词： Finite element method

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LiDAR-Based control of autonomous rotorcraft for the inspection of pier-like structures: Proofs

arXiv

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arXiv 2017年

作者： Guerreiro, Bruno J. Silvestre, Carlos Cunha, Rita Cabecinhas, David Institute for Systems and Robotics LARSyS Instituto Superior Técnico Universidade de Lisboa Av. Rovisco Pais 1 Lisboa1049 Department of Electrical and Computer Engineering Faculty of Science and Technology University of Macau Taipa Macau IST

This is a complementary document to the paper presented in [1], where more detailed proofs are provided for some results. The main paper addresses the problem of trajectory tracking control of autonomous rotorcraft in operation scenarios where only relative position measurements obtained from LiDAR sensors are possible. The proposed approach defines an alternative kinematic model, directly based on LiDAR measurements, and uses a trajectory-dependent error space to express the dynamic model of the vehicle. An LPV representation with piecewise affine dependence on the parameters is adopted to describe the error dynamics over a set of predefined operating regions, and a continuous-time H2 control problem is solved using LMIs and implemented within the scope of gain-scheduling control theory. In this document, Section A presents the stability analysis of the attitude inner-loop presented in [1, Section II.B], whereas Section B presents a more detailed version of the stability and performance guarantees for the LPV system, extending the results presented in [1, Section IV.A]. Copyright © 2017, The Authors. All rights reserved.

关键词： Continuous time systems

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