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European Conference on Power Electronics and Applications

作者： Charoula G. Zogogianni Dionisis Voglitsis Stefanos Saridakis Stylianos P. Syrigos Nick P. Papanikolaou Anastasios Kyritsis Michael Loupis Theodoros A. Tsiftsis Emmanuel C. Tatakis uiversity of patras Electrical and Computer Engineering Department Laboratory of Electromechanical Energy Conversion 26504 Rion-Patras Greece DEMOCRITUS UNIVERSITY OF THRACE V. Sofias 12 Xanthi Greece centre for renewable energy sources PV Systems and DER Department 19th km Marathon Ave. 19009 Pikermi Greece TEI OF CENTRAL GREECE 35100 Lamia Greece

ISBN: (纸本)9781479982776

Several types of energy recovery systems (i.e. shaft generators etc.) have been installed in marine vessels, in order to reduce the fuel consumption and ultimately improve the efficiency of the vessels. In this paper, an energy recovery system utilizing the thermal losses of a real ship is investigated. The main goal of this work is to improve the overall efficiency of the ship. Therefore, a theoretical study and apparatus selection is conducted for every part of a proposed Waste Heat Recovery System. Moreover, simulation results of each part, as well as of the whole system, are presented in this paper.

关键词： Waste heat harvesting Thermoelectric energy Voltage Source Inverters (VSI) Ship

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Multivariable algebraic loops with complementarity constraints enforcing some KKT conditions 52

Multivariable algebraic loops with complementarity constrain...

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2014 52nd Annual Allerton Conference on Communication, control, and Computing, Allerton 2014

作者： Adegbege, Ambrose A. Heath, William P. Department of Electrical and Computer Engineering College of New Jersey 2000 Pennington Road EwingNJ08628-0718 United States Control Systems Centre School of Electrical and Electronic Engineering University of Manchester M13 9PL United Kingdom

ISBN: (纸本)9781479980093

In this paper, we address the wellposedness and online resolution of algebraic loop arising from the feedback interconnection of a linear time invariant system and a static nonlinearity whose input-output characteristics enforce some KKT optimality conditions. We establish sufficient conditions for the wellposedness of such algebraic loops using the theory of linear complementarity problems. In particular, we show that wellposedness is equivalent to the existence and uniqueness of solution of a convex optimization problem for which efficient solution algorithms are well established. The application of the results to constrained control problem is illustrated using a multivariable antiwindup design. © 2014 IEEE.

关键词： Linear time-invariant system

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Enhanced face verification and image quality assessment scheme using modified optical flow technique

Enhanced face verification and image quality assessment sche...

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World Congress on engineering and computer Science 2014, WCECS 2014

作者： Omidiora, Elijah O. Olabiyisi, Stephen O. Ojo, John A. Ganiyu, Raflu A. Abayomi-Alli, Adebayo A. Department of Computer Science and Engineering Ladoke Akintola University of Technology Ogbomoso Nigeria Department with the Electronic and Electrical Engineering Department Ladoke Akintola University of Technology Ogbomoso Nigeria Sound Systems and Structures Laboratory University of Pittsburgh United States Department of Computer Science Federal University of Agriculture Abeolcuta Nigeria

ISBN: (纸本)9789881925275

Biometric applications are faced with enormous performance challenges due to submission of low quality facial images. Previous research studies used only one property of the face or one feature within the recognition process to assess facial image quality, others employed expensive and cumbersome partial or no-reference subjective quality assessment protocols. In this work, an enhanced face verification and image quality assessment (FVIQA) scheme for predicting images in low quality surveillance scenarios was developed. Pose, faceness, illumination, contrast and similarity quality attributes were extracted using an objective full- reference quality assessment protocol but emphasis was placed on the modified Lucas and Kanade's algorithm for measuring pose displacement between a pair of probe and gallery image from same subject. Structured image verification experiments were conducted on the surveillance camera (SCface) database to collect individual quality scores and algorithm matching scores from FVIQA using three recognition algorithms namely principal component analysis (PCA), linear discriminant analysis (LDA) and a commercial recognition SDK. Results from the experiments were improved and shows consistency with previous studies. FVIQA accurately assigns quality scores to probe image samples and the quality scores highly correlate with the algorithms matching scores. The pose quality scores (QP) was significantly improved with a correlation coefficient (R) of 0.982 and 0.839 with OQS and AMS respectively. In future FVIQA could be extended to a larger set of assessment and enhancement techniques such as age, color neutrality, exposure, out-of-focus and blur.

关键词： Biometrics

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Effect of channel aging on the sum rate of uplink massive MIMO systems

Effect of channel aging on the sum rate of uplink massive MI...

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IEEE International Symposium on Information Theory

作者： Chuili Kong Caijun Zhong Anastasios K. Papazafeiropoulos Michail Matthaiou Zhaoyang Zhang Institute of Information and Communication Engineering Zhejiang University Hangzhou China National Mobile Communications Research Laboratory Southeast University Nanjing China Communications and Signal Processing Group Imperial College London London U.K Department of Signals and Systems Chalmers University of Technology Gothenburg Sweden Electrical Engineering and Computer Science Queen's University Belfast Belfast U.K

ISBN: (纸本)9781467377058

This paper investigates the achievable sum-rate of uplink massive multiple-input multiple-output (MIMO) systems considering a practical channel impairment, namely, aged channel state information (CSI). Taking into account both maximum ratio combining (MRC) and zero-forcing (ZF) receivers at the base station, we present tight closed-form lower bounds on the sum-rate for both receivers, which provide efficient means to evaluate the sum-rate of the system. More importantly, we characterize the impact of channel aging on the power scaling law. Specifically, we show that the transmit power of each user can be scaled down by 1/√(M), which indicates that aged CSI does not affect the power scaling law; instead, it causes only a reduction on the sum rate by reducing the effective signal-to-interference-and-noise ratio (SINR).

关键词： Aging MIMO Receivers Uplink Channel estimation Antennas Training

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Measurement-based radar waveform optimization using the ambiguity function and spectral mask

Measurement-based radar waveform optimization using the ambi...

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2014 Texas Symposium on Wireless and Microwave Circuits and systems, WMCS 2014

作者： Fellows, Matthew Barlow, Jennifer Barkate, Joseph Mosley, Matthew Flachsbart, Matthew Baylis, Charles Cohen, Lawrence Marks, Robert J. Wireless and Microwave Circuits and Systems Program Department of Electrical and Computer Engineering Baylor University WacoTX United States Naval Research Laboratory Radar Division WashingtonDC United States

ISBN: (纸本)9781479973095

This paper demonstrates the optimization of a radar waveform based on ambiguity function measurements and spectral mask criteria. Compliance with spectral mask criteria is becoming ever-critical in radar systems due to the increased number of devices using the wireless spectrum. The capability of reducing ambiguity at certain range-Doppler combinations is useful in enhancing the detection capability of radar systems. This paper shows the combined optimization for both ambiguity function and spectral mask criteria based on time-domain measurements taken with a high-speed oscilloscope. A benefit of optimizing based on measurements is that the transmitter power amplifier's output waveform can be used, allowing the results of nonlinear distortion to be factored into the optimization process. © 2014 IEEE.

关键词： Power amplifiers

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Monitor-based Liveness-enforcing Petri Net Supervisors for Flexible Manufacturing systems 33

Monitor-based Liveness-enforcing Petri Net Supervisors for F...

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第三十三届中国控制会议

作者： YOU Dan WANG Shouguang ZHOU MengChu WU Wenhui School of Information & Electronic Engineering Zhejiang Gongshang University IEEE State Key Laboratory for Manufacturing Systems Engineering Xi’ an Jiaotong University The Key Laboratory of Embedded System and Service Computing Ministry of EducationTongji University Department of Electrical and Computer Engineering New Jersey Institute of TechnologyNewarkNJ 07102USA

ISBN: (纸本)9781479947249

Deadlocks are a rather undesirable phenomenon in flexible manufacturing systems(FMSs).This work,by adding monitors,develops a deadlock prevention policy for FMSs that can be modeled by a class of Petri nets called-S3 PR ***,an algorithm is given to reduce an S3 PR via *** on it,-resources in-S3 PRs are classified into A--resources and ***,for an-S3 PR with only B--resources,it is proved that a maximally permissive liveness-enforcing supervisor can be designed by M-controlling all the emptied strict minimal siphons(SMSs).For an-S3 PR containing A--resources,a liveness-enforcing supervisor can be designed by iteratively reducing the net via A--resources and adding the corresponding ***,a comprehensive deadlock prevention algorithm for-S3 PRs is *** FMS example is used to illustrate its application.

关键词： Flexible manufacturing system(FMS),Petri nets,deadlock prevention policy,supervisory control

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Urysohn measure driven integral equations in the space of bounded variation functions and applications

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AIP Conference Proceedings 2016年第1期1773卷

作者： G. Dimitriu B. Satco 1Department of Mathematics and Informatics Grigore T. Popa University of Medicine and Pharmacy Universităţii 16 Iaşi 700115 Romania 2Faculty of Electrical Engineering and Computer Science Ştefan cel Mare University of Suceava Universităţii 13 Suceava 720229 Romania 3Integrated Center for Research Development and Innovation in Advanced Materials Nanotechnologies and Distributed Systems for Fabrication and Control (MANSiD) Ştefan cel Mare University Suceava Romania

Motivated by the fact that bounded variation (often discontinuous) functions frequently appear when studying integral equations that describe physical phenomena, we focus on the existence of bounded variation solutions for Urysohn integral measure driven equations. Due to numerous applications of Urysohn integral equations in various domains, problems of this kind have been extensively studied in literature, under more restrictive assumptions. Our approach concerns the framework of Kurzweil-Stieltjes integration, which allows the occurrence of high oscillatory features on the right hand side of the equation. A discussion about interesting consequences of our main result (given by particular cases of the measure driving the equation) is presented. Finally, we show the generality of our results by investigating two examples of impulsive type problems (from both theoretical and numerical perspective) and giving an application in electronics industry concerning polarization properties of ferroelectric materials.

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Robust control reconfiguration of resource allocation systems with Petri nets and integer programming

Robust control reconfiguration of resource allocation system...

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作者： Li, Jun Zhou, Mengchu Guo, Tao Gan, Yahui Dai, Xianzhong Key Laboratory of Measurement and Control of Complex Systems of Engineering Ministry of Education China School of Automation Southeast University Nanjing 210096 China Key Laboratory of Embedded System and Service Computing Ministry of Education Tongji University Shanghai 201804 China Department of Electrical and Computer Engineering New Jersey Institute of Technology Newark NJ 07102 United States

Supervisory control reconfiguration can handle the uncertainties including resource failures and task changes in discrete event systems. It was not addressed to exploit the robustness of closed-loop systems to accommodate some uncertainties in the prior studies. Such exploitation can cost-efficiently achieve reconfigurability and flexibility for real systems. This paper presents a robust reconfiguration method based on Petri nets (PNs) and integer programming for supervisory control of resource allocation systems (RASs) subject to varying resource allocation relationships. An allocation relationship is seen as a control specification while the execution processes requiring resources as an uncontrolled plant. First, a robust reconfiguration mechanism is proposed. It includes updating the P-invariant-based supervisor and evolving the state of the closed-loop system. The latter adapts to the control specification changes by the self-regulation of the closed-loop system's state. Next, two novel integer programming models for control reconfiguration are proposed, called a reconfiguration model with acceptability and reconfiguration one with specification correction. Since both models integrate the firability condition of transitions, no additional efforts are required for the state reachability analysis. Finally, a hospital emergency service system is used as an example to illustrate them. © 2014 Elsevier Ltd. All rights reserved.

关键词： Integer programming

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Formation merging control in 3D under directed and switching topologies 19

Formation merging control in 3D under directed and switching...

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

作者： Han, Tingrui Lin, Zhiyun Fu, Minyue College of Electrical Engineering ZheJiang University 38 Zheda Road Hangzhou310027 China State Key Laboratory of Industrial Control Technology College of Electrical Engineering ZheJiang University 38 Zheda Road Hangzhou310027 China School of Electrical Engineering and Computer Science University of Newcastle CallaghanNSW2308 Australia Department of Control Science and Engineering ZheJiang University 38 Zheda Road Hangzhou310027 China

ISBN: (纸本)9783902823625

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. © IFAC.

关键词： Multi agent systems

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Ultraviolet photodetector fabricated from 3D WO₃ nanowires/reduced graphene oxide composite material

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Behavioral and Brain Sciences 2014年第2期1659卷 193-198页

作者： Shao, Dali Yu, Mingpeng Lian, Jie Sawyer, Shayla Department of Electrical Computer and Systems Engineering Rensselaer Polytechnic Institute Troy 12180 NY United States Department of Mechanical Aerospace and Nuclear Engineering Rensselaer Polytechnic Institute Troy 12180 NY 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... 详细信息

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 © Materials Research Society 2014.

关键词： composite nanoscale photoconductivity

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