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International Symposium on Intelligent Systems and Informatics (SISY)

作者： Aleksandar Simeonov Slavica Medic Miroslav Popovic Micronas NIT Limited Liability Company Novi Sad Serbia Faculty of Technical Sciences General Department Chair for Mathematics University of Novi Sad Novi Sad Serbia Department of Computing and Automation Chair of Computer Engineering Novi Sad Serbia

There are many different instruction scheduling techniques that are used in compilers today. The most frequently used one is the list scheduling. It is easy to implement and gives good results in most cases. It works on the basic block level. According to Fisher and Rau instruction level parallelism that can be achieved using this technique cannot be greater then 2. Architectures with deep pipeline can run much more instructions in the same cycle and global scheduler techniques can give better results. In our tests we used a dominator path scheduler with three different strategies for choosing the scheduling paths. Our application encoded sound to the mp3 format, and was run on a digital signal processor with a deep pipeline. Using these scheduling techniques, our C compiler generated 10% fewer NOP instructions compared to local instruction scheduling. In addition, this implementation of a dominator path scheduler was used on a C compiler for SUN Sparc processors (for testing purposes only), and it was shown that the same implementation of the scheduler can be used for different platforms.

关键词： Pipelines Processor scheduling Testing Computer aided instruction Sun History Computer architecture Mathematics automation Parallel processing

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On the use of proper weighting in reference tracking optimal control with guaranteed DARE solvability

On the use of proper weighting in reference tracking optimal...

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Mediterranean Conference on control and automation (MED)

作者： Peter Bauer Balazs Kulcsar Jozsef Bokor Transportation Engineering Department of Control and Transport Automation Budapest University슠of슠Technology슠and슠Economics Budapest Hungary Delft Center of System and Control Faculty ME Technical University of Delft Delft Netherlands

The paper suggests to apply a proper output weight to achieve guaranteed discrete algebraic Riccati equation (DARE) solvability of the LQ optimal control problem with output tracking. Usually a positive semi definite state weighting matrix (Q) is mentioned to be sufficient for solvable DARE. However, the literature also proposes more general rank conditions. The paper shows a sufficient condition to guarantee DARE solvability under output tracking problems, by the appropriate selection of a Q > 0 matrix. At output tracking quadratic problems Q results as a sparse matrix. Therefore, a special attention has to be carried on the output weighting strategy guaranteing DARE solvability for a class of linear and mostly integrating systems. Injecting additional weights, the closed system performance can be increased. The importance of the proper weighting strategy is illustrated with a numerical example where it has been pointed out that inappropriate weights leads to infeasible DARE.

关键词： automation Conferences

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First Experience of the control System of HVAC Based on KNX Fieldbus Applied in Intelligent Buildings Laboratory

First Experience of the Control System of HVAC Based on KNX ...

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The First International Conference on Building Energy and Environment

作者： Martin Zalesak Petr Polach Tomas Bata University in Zlín Faculty of Applied InformaticsDepartment of Automation and Control EngineeringNad Stráněmi 4511 760 05 ZlínCzech Republic Brno University of Technology Faculty of Electrical Engineering and CommunicationDepartment of Control and InstrumentationKolejní 4612 00 BrnoCzech Republic

A new multipurpose laboratory of building technology has been built in Tomas Bata University, faculty of Applied Informatics and set into test operation. The laboratory supports several subjects like modern HVAC system applications, with renewable sources of energy implemented (solar collectors and reversible heat pump application), and a comprehensive system of control, based on the open bus communication system KNX , communication gate based on the TCP/IP protocol. The laboratory is as well equipped as a training tool for control systems based on bus communication particularly KNX (finished) and LONWORKS and BACNET (under construction). The paper describes the first results achieved by the laboratory.

关键词： Intelligent buildings, Building automation, System integration, Laboratory, Thermal modeling

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Relative stabilities of adsorbed versus substitutional Al atoms in submonolayer Al/SixGe1−x(111)

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Physical Review B 2008年第16期78卷 165409-165409页

作者： D. V. Gruznev D. A. Olyanich D. N. Chubenko Yu. V. Luniakov I. A. Kuyanov A. V. Zotov A. A. Saranin Institute of Automation and Control Processes 690041 Vladivostok Russia Faculty of Physics and Engineering Far Eastern State University 690000 Vladivostok Russia Department of Electronics Vladivostok State University of Economics and Service 690600 Vladivostok Russia

Using scanning tunneling microscopy, low-energy electron-diffraction observations, and density-functional calculations, the effect of adding Ge to Si(111) substrate on the reconstructions induced by Al adsorption has been studied. It has been found that Ge incorporation alters the relative stability of the reconstructions. In particular, while in the “pure” Al/Si(111) system the magic cluster array (α−7×7 phase) is less stable than the 3×3 reconstruction (to which it irreversibly converts upon heating above 600 °C), in the Al/SixGe1−x(111) system magic clusters possess an enhanced thermal stability and persist almost up to the Al desorption temperature of ∼800°. The results of calculations allow us to track the sequential stages of the substitution of Si atoms by Ge in the α−7×7 phase. The general trend found is that adding Ge to Si(111) makes the Al substitutional configuration more preferable than the Al adatom configuration, which is opposite to the relative stabilities of the configurations in the pure Al/Si(111) system.

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Model-based nonlinear optimal blood glucose control of Type I diabetes patients

Model-based nonlinear optimal blood glucose control of Type ...

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Annual International Conference of the IEEE engineering in Medicine and Biology Society (EMBC)

作者： Levente Kovacs Balazs Kulcsar Jozsef Bokor Zoltan Benyo Department of Control Engineering and Information Technology Budapest University슠of슠Technology슠and슠Economics Hungary Delft Center for System and Control Faculty of Mechanical Maritime and Materials Engineering Technical University Delft Netherlands Computer and Automation Research Institute Hungarian Academy of Sciences Budapest Hungary

Using induced L 2 -norm minimization, a robust controller was developed for insulin delivery in Type I diabetic patients. The high-complexity nonlinear diabetic patient Sorensen-model [1] was considered. LPV (Linear Parameter Varying) methodology was used to develop open loop model and robust controller. Considering the normoglycemic set point (81.1 mg/dL), a polytopic set was created over the physiologic boundaries of the glucose-insulin interaction of the Sorensen-model. In this way, LPV model formalism was defined. The robust control was developed considering input and output multiplicative uncertainties with other weighting functions.

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A novel automatic method for multivariable process pairing and control

A novel automatic method for multivariable process pairing a...

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IEEE India Conference (INDICON)

作者： M.-A. Moezzi A. Fatehi M.A. Nekoui Advanced Process Automation and Control (APAC) K. N. Toosi University of Technology Tehran Iran Electrical Engineering Faculty K.N. Toosi University of Technology Tehran Iran

Pairing is the first step of decentralized controller design procedure in multi-input multi-output (MIMO) processes. In spite of considerable efforts dedicated to this problem, most of the known pairing techniques are offline algorithms and fail to decide when dealing with high dimensional and/or time varying processes and adaptive control applications. In this article, normalized effective relative gain array (NERGA) is introduced as an effective automatic pairing method and is employed in a new adaptive decentralized PID control strategy.

关键词： Automatic control Process control MIMO Adaptive control Distributed control Steady-state Design automation Programmable control System identification Transfer functions

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A Neuro-Fuzzy controller for Rotary Cement Kilns

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IFAC Proceedings Volumes 2008年第2期41卷 13259-13264页

作者： Maryam Fallahpour Alireza Fatehi Babak N. Araabi Morteza Azizi Control & Intelligent Processing Center of Excellence School of Electrical & Computer Eng. University of Tehran Tehran Iran Advanced Process Automation & Control (APAC) Research Group Electrical Engineering Faculty K. N. Toosi University of Technology Tehran Iran Saveh Cement Co. Saveh Iran

In this paper, we design a neurofuzzy controller to control several variables of a rotary cement kilns. The variables are back-end temperature, pre-heater temperature, oxygen content and CO2 gas content of the kiln. The fuzzy control system, as an advanced control option for the kilns, is intended to minimize the operator interaction in the control process. The proposed fuzzy controller uses a neural network to optimize TSK-type fuzzy controller. Since there is no generally applicable analytical model for cement kilns, we use the real data derived from Saveh cement factory for the plant identification. A model, which is very similar to the real plant, is identified then; and the identified model is used for control design and simulations. Extensive simulation studies justify the effectiveness and applicability of the proposed control scheme in intelligent control of cement plant.

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Single-Parameter Tuning of PI controllers: From Theory to Practice

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IFAC Proceedings Volumes 2008年第2期41卷 4964-4969页

作者： Radek Matušů Roman Prokop Department of Automation and Control Engineering Faculty of Applied Informatics Tomas Bata University in Zlín Nad Stráněmi 4511 760 05 Zlín Czech Republic Tel: +420 57 603 3015 Fax: +420 57 603 5279

The paper deals with influence of a single scalar positive tuning parameter on performance properties of the closed control loop which contains algebraically designed PI controller while the response quality is evaluated by the size of first under- or overshoots. The controller coefficients are calculated from general solutions of diophantine equations in the ring of proper and Hurwitz stable rational functions. Subsequently, these controllers can be tuned by the only parameter. The contribution brings simple tuning rules and, moreover, it presents their possible practical application during control of real laboratory model assumed as system with parametric uncertainty.

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Practical Experience with PMU System Testing and Calibration Requirements

Practical Experience with PMU System Testing and Calibration...

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IEEE General Meeting Power& Energy Society

作者： P. Komarnicki C. Dzienis Z. A. Styczynski J. Blumschein V. Centeno Process and Plant Engineering Business Unit Fraunhofer Institute of Factory Operation and Automation Magdeburg Germany Chair of Electric PowerNetworks and Renewable Energy Sourceson the Faculty of Electrical Engineering and Information Technology Otto-von-Guericke University of Magdeburg Magdeburg Germany Department of Power Transmission and Distribution Energy Automation Division Siemens AG Berlin Germany Bradley Department of Electrical & Computer Engineering Virginia Polytechnic Institute and State University Blacksburg VA USA

New data acquisition technologies, such as phasor measurement units (PMU), have been implemented in recent years to operate the power system with more reliability and control by improving the protection schemes like line differential protection or damping the inter-area oscillations. The present standard IEEE C37.118 only provides general information about the testing conditions and requirements, without giving any specifics.. To create the PMU data function for the applications and thereby make the power system more reliable, the appropriate PMU test standards have to be developed and disseminated. Future testing methods should ensure that units from different manufacturers are tested identically and function properly under different repeatable test scenarios and test stand set up conditions. This paper presents experiences from tests of PMU accuracy and calibration conducted in Europe and the USA, which will facilitate the development of future standards. The test stand itself and the test results from the various PMU manufactures are presented, compared and discussed in this paper, taking into account the standardization issues.

关键词： Accuracy Current measurement Voltage measurement Power systems Frequency measurement Testing Calibration

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Output feedback control of linear systems with input and output quantization

Output feedback control of linear systems with input and out...

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IEEE Conference on Decision and control

作者： Daniel Coutinho Minyue Fu Carlos E. de Souza Group of Automation and Control Systems Faculty of Engineering Pontifícia Universidade Católica do Rio Grande do Sul Porto Alegre Brazil School of Electrical Engineering and Computer Science University of Newcastle Callaghan NSW Australia Department of Systems and Control Laboratory Nacional de Computação Científica Petropolis Rio de Janeiro Brazil

ISBN: (纸本)9781424431236

A considerable amount of research has been done on the use of logarithmic quantizers for networked feedback control systems. However, most results are developed for the case of a single quantizer (either measurement or control signal quantization). In this paper, we investigate the case of simultaneous input and output quantization for SISO linear output feedback systems. Firstly, we show that the problem of quadratic stabilization via quantized feedback can be addressed with no conservativeness by means of the sector bound approach. Secondly, we provide a bound on the maximal admissible sector bound via a scaled H ¿ optimization problem.

关键词： Output feedback Linear feedback control systems control systems Linear systems Quantization Communication system control Feedback control Communication channels Digital control Bandwidth

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