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2009 10th European control Conference, ECC 2009

作者： Alvarez, Teresa Salim, Anuar Maestre, J.M. Department of Engineering Science and Automatic Control School of Computer Engineering University of Valladolid Spain Department of Engineering Science and Automatic Control Faculty of Science University of Valladolid Spain Dept. de Ingeniería de Sistemas y Automática Escuela Superior de Ingenieros University of Seville Spain

ISBN: (纸本)9783952417393

This paper shows how control techniques, such as PID or generalized predictive control, can improve the performance of TCP/IP networks when dealing with congestion. Drop tail, or more sophisticated AQM techniques such as RED, perform worse than process control techniques. A comparison between the different methods in different working scenarios is analyzed. Two different GPC controllers are evaluated. One considers the model resulting from on-line identification and the other is the linearization of the non-linear model. © 2009 EUCA.

关键词： Transmission control protocol

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control system design and small signal analysis of APWM resonant inverter for induction heating

Control system design and small signal analysis of APWM reso...

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2009 International Conference on Electric Power and Energy Conversion Systems, EPECS 2009

作者： Helaimi, M. Bettayeb, M. Benghanem, M. Belmadani, B. Dept. of Electrical Engineering University of Hassiba Ben Bouali Chlef Algeria Electrical and Computer Engeneering Dept. College of Engeneering University of Sharjah United Arab Emirates Dep. of Automatic Control University of Mohamed Boudhiaf-Oran Algeria

ISBN: (纸本)9789948427155

This paper proposes an asymmetrical pulse width modulation (APWM) with frequency tracking control of full bridge series resonant inverter for induction heating application. In this method, APWM is used as power regulation, and phased locked loop (PLL) is used to attain zero-voltage-switching (ZVS) over a wide load range. The complete closed loop control model is obtained using small signal analysis. The validity of the proposed control is verified by simulation results.

关键词： Induction heating

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Structured coprime factorizations description of linear and time-invariant networks

Structured coprime factorizations description of linear and ...

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52nd IEEE Conference on Decision and control, CDC 2013

作者： SabǍu, Şerban OarǍ, Cristian Warnick, Sean Jadbabaie, Ali Electrical and Computer Engineering Dept. Stevens Institute of Technology United States Faculty of Automatic Control Dept. University Politehnica Bucharest Romania Faculty of Computer Science Department Information and Decision Algorithms Laboratories Brigham Young University United States Faculty of Electrical and Systems Engineering Dept. University of Pennsylvannia United States

ISBN: (纸本)9781467357173

In this paper we study state-space realizations of Linear and Time-Invariant (LTI) systems. Motivated by biochemical reaction networks, Gonçalves and Warnick have recently introduced the notion of a Dynamical Structure Functions (DSF), a particular factorization of the system's transfer function matrix that elucidates the interconnection structure in dependencies between manifest variables. We build onto this work by showing an intrinsic connection between a DSF and certain sparse left coprime factorizations. By establishing this link, we provide an interesting systems theoretic interpretation of sparsity patterns of coprime factors. In particular we show how the sparsity of these coprime factors allows for a given LTI system to be implemented as a network of LTI sub-systems. We examine possible applications in distributed control such as the design of a LTI controller that can be implemented over a network with a pre-specified topology. ©2013 IEEE.

关键词： Factorization

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An effective uniform genetic algorithm for hard optimization problems

An effective uniform genetic algorithm for hard optimization...

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Proceedings of the 3th World Congress on Intelligent control and Automation

作者： Wang, Yuping Liu, Hailin Leung, Yiu-Wing Faculty of Science Xidian University Xi'an China Dept. of Automatic Control Eng. South China University of Technol. Guangzhou China Dept. of Computer Science Hong Kong Baptist University Hong Kong Hong Kong

Genetic algorithms are one of the effective algorithms for hard optimization problems. They can escape from the local minima, however, the amount of their computation is often large. To decrease the amount of the computation and enhance the algorithms, the uniform design is combined into the genetic algorithm. The new genetic operator has the local-search property similar to that in traditional optimization techniques and needs a minimal amount of computation in certain meaning. Thus the new genetic algorithm can generate a diversity of population and explore the search space effectively. Moreover, the new algorithm is globally convergent. The numerical results also show the effectiveness of the new algorithm with its less computation, higher convergent speed for all test functions.

关键词： Problem solving

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Optimal distributed control for platooning via sparse coprime factorizations

Optimal distributed control for platooning via sparse coprim...

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2016 American control Conference, ACC 2016

作者： SabǍu, Şerban OarǍ, Cristian Warnick, Sean Jadbabaie, Ali Electrical and Computer Engineering Dept. Stevens Institute of Technology HobokenNJ United States Automatic Control Dept. University Politehnica Bucharest Romania Information and Decision Algorithms Laboratories Faculty of the Computer Science Department Brigham Young University United States Electrical and Systems Engineering Dept. University of Pennsylvania United States

ISBN: (纸本)9781467386821

We introduce a novel distributed control architecture for disturbances attenuation in heterogeneous platoons of linear and time-invariant autonomous agents that inherits the performance achievable by the leader-follower control policies. We provide a Youla-like parameterization for the class of all distributed controllers such that the sparsity constraints are imposed on the controllers' left coprime factors, outlining a new concept of structural constraints in distributed control. The proposed scheme lends itself to optimal controller design via norm based costs, it guarantees string stability and completely eliminates the accordion effect from the behavior of the platoon. The distributed controller is proven to attain global optimality for heterogeneous platoons and H2 costs and can easily reconfigure such as to remain optimal during formation merging/exiting maneuvers. The scheme is amenable to a GPS time base synchronization mechanism, allowing for the exact compensation of the time delays induced by the wireless communications. © 2016 American automatic control Council (AACC).

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A technology to simultaneously produce clean hydrogen and iron powder

A technology to simultaneously produce clean hydrogen and ir...

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作者： George, Stefanoiu Horatiu Octavian, Stanasila Corneliu, Stanasila Virgil Dan, Stefanoiu Bioterra University of Bucharest Dept. of Chemistry Romania Politehnica University of Bucharest Dept. of Applied Sciences Romania Technical University of Civil Engineering Bucharest Romania Politehnica University of Bucharest Dept. of Automatic Control and Computer Science Romania

ISBN: (纸本)9789604742271

The redox steam-iron process, which has been discovered in the early 1900's, was finally abandoned because the degradation of the iron oxide ores within a few cycles. Recently, this process has been reconsidered, due to the necessity to yield cheap and pure hydrogen. In this article, we introduce a related but improved technology. At the first stage, the inlet iron oxide for the steam-iron process is the hematite, which has to be reduced to metallic iron in a gasifier called HG, by using syngas from coke (or cellulose). The hydrogen is then produced in a cyclic process, based upon the reduction of metallic iron by means of steam. At the second stage, another hematite, at any granulation, is reduced to iron powder in a reactor called IPR, at about 570°C by using the hydrogen of HG.

关键词： Heat transfer

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A DECISION SUPPORT SYSTEM FOR COMMUNICATION NETWORK ANALYSIS BASED ON HYBRID PETRI NET MODELS

arXiv

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arXiv 2017年

作者： Caramihai, Simona Iuliana Munteanu, Călin Culiţă, Janetta Politehnica" University of Bucharest Dept. of Automatic Control and Computer Science Romania

It is well known that the complex system operation requires the use of new scientific tools and computer simulation. This paper presents a modular approach for modeling and analysis of the complex systems (in communication or transport systems area) using Hybrid Petri nets. The performance evaluation of the hybrid model is made by a simulation methodology that allows building up various functioning scenarios. A Decision Support System based on the above mentioned methodologies of modeling and analysis will be designed for performance evaluation and time optimization of large scale communication and/or transport systems. Copyright © 2017, The Authors. All rights reserved.

关键词： Decision support systems

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Contourlet Based Interest Points Detector

Contourlet Based Interest Points Detector

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20th IEEE International Conference on Tools with Artificial Intelligence

作者： Saydam, Samer R. El rube', Ibrahim A. Shoukry, Amin A. CS Department Computing and Information Technology College AASTMT Egypt EC Eng. Dept. College of Engineering and Technology AASTMT Egypt Computer Science and Automatic Control Department Faculty of Engineering Alexandria University Egypt

ISBN: (纸本)9780769534404

This paper proposes a robust algorithm for detecting interest points based on the NonsubSampled Contourlet Transform (NSCT). The NSCT provides multiscale decomposition with directional filters at each scale. Furthermore, NSCT is very efficient in extracting the geometric information of images and therefore it has very good feature localization. The NSCT-based point detector is compared to the widely used Harris and Difference of Gaussian (DoG) interest point detectors. The experimental results reveal the robustness of the proposed algorithm to rotation, scale and viewpoint changes.

关键词： Interest point detection corner detector local features nonsubsampled contourlet transform (NSCT)

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Density-based spatial clustering in the presence of obstacles

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AEJ - Alexandria Engineering Journal 2005年第3期44卷 387-399页

作者： Saad, Amani A. Abougabal, Mohamed S. Moustafa, Amal Computer Science and Automatic Control Dept. Faculty of Eng. Alexandria University Alexandria Egypt

This paper proposes a density based clustering algorithm which takes obstacles into consideration. The proposed Clustering with Obstacle Entities algorithm COE-DBSCAN is based on the DBSCAN algorithm, which performs effective clustering for spatial data based on the notion of density. The paper presents a survey of existing spatial clustering algorithms and identifies the problems of related algorithms that deal with obstacles. The complexity of the proposed algorithm COE-DBSCAN is analyzed and some experimental work is presented. It is shown that COE-DBSCAN overcomes the problems of existing spatial clustering algorithms considering obstacles. The paper is concluded with some suggestions for further research issues. © Faculty of Engineering Alexandria University.

关键词： Clustering in the presence of obstacles Density based clustering Spatial Spatial clustering Spatial data mining

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Real-time visual predictive control of manipulation systems

Real-time visual predictive control of manipulation systems

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IEEE 15th International Conference on Advanced Robotics: New Boundaries for Robotics, ICAR 2011

作者： Burlacu, Adrian Copot, Cosmin Cervera, Enric Lazar, Corneliu Dept. of Automatic Control and Applied Informatics Technical University of Iasi D. Mangeron Street no.27 700050 Iasi Romania Dept. of Computer Science and Engineering Jaume I University Campus Riu Sec 12071 Castello Spain

ISBN: (纸本)9781457711589

This paper presents the results obtained by visual predictive control laws in real-time visual servoing architectures. A key role when designing a stable image based control law is played by the visual features, and thus both points and image moments were considered and their performance revealed. A 6 d.o.f manipulator robot with an eye-in-configuration is used to design a visual servoing architecture and realtime implementation using Matlab is described. The results of different experiments for planar static objects are presented and discussed. For establishing the performance of visual predictive control laws a comparison with classical image based control laws is conducted. © 2011 IEEE.

关键词： Visual servoing

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