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Nonlinear fuzzy control of human heart rate during aerobic endurance training with respect to significant model variations

Nonlinear fuzzy control of human heart rate during aerobic e...

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International Conference on System Theory, control, and Computing (ICSTCC)

作者： Adrian Pătraşcu Monica Patrascu Iacob Hantiu Faculty of Physical Education and Sport Babeş-Bolyai University Cluj-Napoca Romania Automatic Control and Systems Engineering Dept. University Politehnica of Bucharest Bucharest Romania

In the field of physical activity a significant importance is held by aerobic endurance training, which is a relatively low intensity exercise that depends primarily on aerobic energy generating processes. This type of training is used for the overall endurance and fitness of the body by engaging all the major systems of the body and pushing the limits of their functions with the ultimate goal of adapting these structures to the stress of the physical effort and thus improving the performance output. However, using classic training methods, it is often impossible to ensure the necessary operating points in order to obtain the desired results. The human heart rate model with respect to the velocity of walking or running presents inherent nonlinearities that are required to be taken into account when designing computer integrated training aids. This paper implements such a tool using a fuzzy control system for human heart rate during aerobic endurance training. The controller is tested and validated using two nonlinear human-on-treadmill models, and it presents robustness to significant model variations, as well as uncertainties in the model parameters and white noise type of disturbances. The designed control system ensures desired heart rate profiles, finding its usefulness in supporting the training configuration process by specialized professionals.

关键词： Heart rate Training control systems Fuzzy logic Mathematical model Adaptation models Computational modeling

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Active fault isolation in MIMO systems 19

Active fault isolation in MIMO systems

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

作者： Niemann, Henrik Poulsen, Niels Kjølstad Department of Electrical Engineering Automation and Control Technical University of Denmark Building 326 LyngbyDK-2800 Kgs. Denmark Dept. of Applied Mathematics and Computer Science Section for Dynamical Systems Technical University of Denmark LyngbyDK-2800 Kgs. Denmark

ISBN: (纸本)9783902823625

Active fault isolation of parametric faults in closed-loop MIMO systems are considered in this paper. The fault isolation consists of two steps. The first step is group-wise fault isolation. Here, a group of faults is isolated from other possible faults in the system. The group-wise fault isolation is based directly on the input/output signals applied for the fault detection. It is guaranteed that the fault group includes the fault that had occurred in the system. The second step is individual fault isolation in the fault group. Both types of isolation are obtained by applying dedicated auxiliary inputs and the associated residual outputs. © IFAC.

关键词： Fault detection

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Flexible selective parallel algorithms for big data optimization

Flexible selective parallel algorithms for big data optimiza...

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Asilomar Conference on Signals, Systems & computers

作者： Amir Daneshmand Francisco Facchinei Vyacheslav Kungurtsev Gesualdo Scutari Dept. of Electrical Engineering at the State Univ. of New York at Buffalo Buffalo USA Dept. of Computer Control and Management Engneering Univ. of Rome La Sapienza Rome Italy Dept. of Computer Science Czech Technical University Prague

We propose a decomposition framework for the parallel optimization of the sum of a differentiable (possibly nonconvex) function and a nonsmooth (separable), convex one. The latter term is usually employed to enforce structure in the solution, typically sparsity. The main contribution of this work is a novel parallel, hybrid random/deterministic decomposition scheme wherein, at each iteration, a subset of (block) variables is updated at the same time by minimizing local convex approximations of the original nonconvex function. To tackle with huge-scale problems, the (block) variables to be updated are chosen according to a mixed random and deterministic procedure, which captures the advantages of both pure deterministic and random update-based schemes. Almost sure convergence of the proposed scheme is established. Numerical results on huge-scale problems show that the proposed algorithm outperforms current schemes.

关键词： Optimization Approximation methods Convergence Big data Parallel algorithms Minimization Linear programming

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Hardware implementation on FPGA of two modulation techniques for three phase inverters

Hardware implementation on FPGA of two modulation techniques...

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2013 IEEE 9th International Conference on Intelligent computer Communication and Processing, ICCP 2013

作者： Alecsa, B. Onea, A. Dept. of Automatic Control and Computer Engineering Technical University of Iaşi Iaşi Romania

ISBN: (纸本)9781479914937

This paper presents two modern modulation techniques applied to three phase inverters from a hardware implementation point of view. The considered techniques are the sinusoidal pulse width modulation with zero sequence injection and the space vector modulation. Both these techniques conduct to the same result regarding supply voltage usage efficiency and harmonic content of the resulted signals. The implementation was developed in Matlab-Simulink using the System Generator software, and validated through simulation. Both the modulation algorithms were implemented in hardware on a low cost FPGA, and the resulted designs are compared for resource usage efficiency, obtained speed and easiness of integration within a complex AC drive control system. © 2013 IEEE.

关键词： Pulse width modulation

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Design and implementation of a multi-standard event-driven energy management system for smart buildings

Design and implementation of a multi-standard event-driven e...

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IEEE Global Conference on Consumer Electronics (GCCE)

作者： Iman Khajenasiri Edoardo Patti Marco Jahn Andrea Acquaviva Marian Verhelst Enrico Macii Georges Gielen Katholieke Universiteit Leuven Leuven Flanders BE Dept. of Control and Computer Engineering Politecnico di Torino Italy Dept. of User Centered Computing Fraunhofer Institute for Applied Information Technology Germany Dept. of Electrical Engineering-ESAT MICAS Leuven KU Belgium

This paper presents the design and implementation of a multi-standard energy management system, which leverages heterogeneous devices to convert existing buildings into Smart Buildings. Its main purpose is to increase the energy efficiency of buildings providing user awareness to promote green behaviors. The proposed solution has been designed to enable interoperability across different standards and protocols in order to develop applications with which end users can interact with the system. Finally, a web portal and a smartphone application to give feedback and to view environmental information are presented.

关键词： Temperature measurement Buildings Energy management Peer-to-peer computing Protocols Software Zigbee

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Detection of the External Magnetic Field Polarity Through the Inductance Voltage Harmonic Phase Order

Detection of the External Magnetic Field Polarity Through th...

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Telecommunications Forum

作者： Nebojsa U. Pjevalica Nenad S. Petrovic Milos M. Nikolic the University of Novi Sad Faculty of Technical sciences Computing and control engineering dept. Trg Dositeja Obradovica 6 21000 Novi Sad Serbia the School of Electrical Engineering Stari grad Visokog Stevana 37 11000 Belgrade Serbia RT-RK Computer based systems Narodnog fronta 23a 21000 Novi Sad Serbia

ISBN: (纸本)9781509000562

Inductance is a basic electrical element that couples magnetic flux and current. In many applications the linear approximation of inductance provides sufficiently good results of analysis. In the presence of an additional DC bias magnetic field H_(DC), the observed B-H curve is forced to be moved from its unbiased state and an asymmetric nonlinearity of the targeted inductance is produced. Diagnostic method is proposed, which couples voltage harmonic phases and the direction of H_(DC) bias field by means of the LT Spice simulation. An experimental verification of the proposed technique is successfully accomplished, along with the settlement of the further research.

关键词： harmonic component DC bias hysteresis curve inductance nonlinear inductance

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Comparative study of robot kinematic calibration algorithms using a unified geometric framework

Comparative study of robot kinematic calibration algorithms ...

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IEEE International Conference on Robotics and Automation (ICRA)

作者： Yuanqing Wu Cheng Li Jing Li Zexiang Li Dept. Electronic and Computer Engineering Hong Kong University of Science and Technology Hong Kong P.R. China Dept. Control Science and Engineering The Jiang University Hang Zhou P. R. China

In this paper, we conduct a comparative study of three well known robot kinematic calibration algorithms, namely the Denavit-Hartenberg (DH) parameter algorithm, the product of exponentials (POE) algorithm, and the local POE (LPOE) algorithm. To cope with distinct formulations associated to different algorithms, we propose a unified geometric framework which is based on POE kinematics and a novel Adjoint error model. The Adjoint error model offers us an extremely efficient way to benchmark the aforesaid calibration algorithms, and also compare them to a novel calibration algorithm based on the Adjoint error model.

关键词： Calibration Joints Kinematics Jacobian matrices Robot kinematics Manipulators

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Contraposition Nyquist Stability Criteria for Linear Time-Delayed Systems of Retarded Type

Contraposition Nyquist Stability Criteria for Linear Time-De...

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International Conference on control, Automation, Robotics & Vision

作者： Jun Zhou Xinbiao Lu Huimin Qian Dept. of Automatic Control Engineering Hohai Univ. Nanjing 211100 China

ISBN: (纸本)9781479952007

This paper reports some Nyquist-type criteria for exponential/asymptotical stability in linear time-delayed systems of retarded type, by introducing contraposition seperators into the return difference ratio relationships in feedbacks. The Nyquist criteria present necessary and sufficient stability conditions, delays-dependent, which can be interpreted similarly and examined graphically as we do for linear time-invariant systems. The suggested Nyquist criteria involve neither open-loop characteristic roots distribution nor encirclement/orientation of Nyquist loci, which are not available even approximately and finite-dimensionally in linear time-delayed systems. The Nyquist criteria can be easily applied to open-loop linear time-delayed systems. Examples are included to illustrate the results.

关键词： Nyquist criterion Nyquist stability graphically Linear root distribution

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CSMA over time-varying channels: Optimality, uniqueness and limited backoff rate 13

CSMA over time-varying channels: Optimality, uniqueness and ...

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14th ACM International Symposium on Mobile Ad Hoc Networking and Computing, MobiHoc 2013

作者： Yun, Se-Young Shin, Jinwoo Yi, Yung Dept. of Automatic Control KTH Sweden Dept. of Electrical Engineering KAIST Korea Republic of

ISBN: (纸本)9781450321938

Recent studies on MAC scheduling have shown that carrier sense multiple access (CSMA) algorithms can be throughput optimal for arbitrary wireless network topology. However, these results are highly sensitive to the underlying assumption on 'static' or 'fixed' system conditions. For example, if channel conditions are time-varying, it is unclear how each node can adjust its CSMA parameters, so-called backoff and channel holding times, using its local channel information for the desired high performance. In this paper, we study 'channel-aware' CSMA (A-CSMA) algorithms in time-varying channels, where they adjust their parameters as some function of the current channel capacity. First, we show that the achievable rate region of A-CSMA equals to the maximum rate region if and only if the function is exponential. Furthermore, given an exponential function in ACSMA, we design updating rules for their parameters, which achieve throughput optimality for an arbitrary wireless network topology. They are the first CSMA algorithms in the literature which are proved to be throughput optimal under time-varying channels. Moreover, we also consider the case when back-off rates of A-CSMA are highly restricted compared to the speed of channel variations, and characterize the throughput performance of A-CSMA in terms of the underlying wireless network topology. Our results not only guide a high-performance design on MAC scheduling under highly time-varying scenarios, but also provide new insights on the performance of CSMA algorithms in relation to their backoff rates and underlying network topologies. Copyright 2013 ACM.

关键词： Carrier sense multiple access

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Design and operation of a fast-risetime, 500 Hz, 24 kV, optically-isolated pulse trigger generator

Design and operation of a fast-risetime, 500 Hz, 24 kV, opti...

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IEEE Symposium Power Modulator

作者： David H. Barnett Jonathan Parson Curtis. Lynn Patrick Kelly Mark Taylor James Dickens Andreas Neuber John Mankowski Steve Calico Michael Scott Dept. of Electrical and Computer Engineering Texas Tech University Lubbock TX USA Lockheed Martin Missiles and Fire Control Grand Prairie TX USA

This paper presents the design and performance characteristics of an optically isolated, trigger generator for spark gap applications that is capable of operating at over 500 Hz rep rate. The pulsed trigger generator is designed to achieve fast risetimes on the order of 1kV/ns to cause breakdown between the trigatron trigger pin and the opposite electrode. The pulsed trigger generator is designed to trigger a 10-stage, 500 kV, 42 J Marx generator. The system is capable of delivering a 4-25 kV pulse with a 10/90 risetime of 20 ns. A board was fabricated to control a capacitor charger and high voltage thyristor via fiber optic inputs. The capacitor charger, a 60 W constant current dc-dc power supply with variable voltage control, is capable of charging 1 nF in less than 0.3 ms. The system is battery-powered using a 33 V lithium polymer battery pack for isolated operation in noisy environments. For burst mode operation, a larger 250 nF buffer capacitor, which is initially charged, is connected through a 100 kΩ resistor to the trigger capacitor, which is varied between 1 and 40 nF. The value of the trigger capacitor is adjusted to provide optimum performance for a given transformer and magnetic switch. System modeling results along with experimental data are discussed including the reliability and performance of the overall system including jitter at 500 Hz operation.

关键词： Capacitors Thyristors Optical switches Magnetic cores Pulse transformers Saturation magnetization

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