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Asia Modelling Symposium 2010: 4th International Conference on Mathematical Modelling and Computer Simulation, AMS2010

作者： Jailani, R. Tokhi, M.O. Gharooni, S.C. Hussain, Z. Department of Automatic Control and System Engineering University of Sheffield United Kingdom Faculty of Electrical Engineering Universiti Teknologi MARA 40450 Shah Alam Malaysia

ISBN: (纸本)9780769540627

This paper presents a simulation of bipedal locomotion to control the stimulation pulses of functional electrical stimulation (FES) for activating muscles for paraplegic walking with spring brake orthosis (SBO). The work is a first effort towards restoring natural like swing phase in paraplegic gait through a new hybrid orthosis, referred to as spring brake orthosis (SBO). This mechanism simplifies the control task and results in smooth motion and more-natural like trajectory produced by the flexion reflex for gait in spinal cord injured subjects. The study is carried out with a model of humanoid with wheel walker using the Visual Nastran (Vn4D) dynamic simulation software. Stimulated muscle model of quadriceps is developed for knee extension. Proportional integral derivative (PID) control is developed in Matlab/Simulink to regulate the muscle stimulation pulse-width required to drive FES-assisted walking gait and the computed motion is visualised in graphic animation from Vn4D. The results show that SBO can reduce torque and stimulation pulses required for FES-assisted paraplegic walking with wheel walker and PID control is found to be appropriate controller for the leg extension. © 2010 IEEE.

关键词： Three term control systems

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Development of a distributed elevator control system based on the microcontroller PIC 18F458

Development of a distributed elevator control system based o...

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2010 IEEE Region 8 International Conference on Computational Technologies in Electrical and Electronics engineering, SIBIRCON-2010

作者： Huseinbegovic, S. Kreso, S. Tanovic, O. Faculty of Electrical Engineering Department of Automatic Control and Electronics University of Sarajevo 71000 Sarajevo Bosnia and Herzegovina

ISBN: (纸本)9781424476268

This paper presents the distributed control system for elevators (DECS). Based on the characteristics of the today installed elevator systems, the electric traction elevator has been chosen for this paper. Conventional elevator control systems (ECS) have several disadvantages compared to modern control systems (large number of cables, safety issues, etc.). An alternative to conventional ECS is the DECS. A DECS based on the CAN (controller Area Network) protocol is presented in this paper. The presented ECS consists of three modules: CU Elevator (CU - control Unit), CU Cabin, CU Floor. The mentioned modules, control principles and implementation methods based on the PIC 18F458 microcontroller are presented in detail. A description of the CAN protocol design with message scheduling on the bus is given. Messages with an 11 bit identifier without a data field have been used for the distributed control system synthesis. The time analysis of bus availability/traffic demonstrates the adequacy of the distributed control system Based on the defined messages and 5 presented modes of operation, an algorithm of operation has been formed for every control system module. Finally experimental results are presented that have been obtained from a developed CAN based elevator control system. The conducted tests have confirmed the functionality of the elevator control system. © 2010 IEEE.

关键词： Distributed parameter control systems

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Functions approximation based on locally learning techniques

Functions approximation based on locally learning techniques

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International Conference on Computational Cybernetics (ICCC)

作者： Nicolae Constantin Silviu Dumitriu Automatic Control and Computers Faculty Automatic Control and Systems Engineering Department University Politehnica of Bucharest Bucharest Romania

ISBN: (纸本)9781424474325

This paper presents a new algorithm for approximating a nonlinear function by means of local models. It is proposed a memory-based technique for selecting the best model configuration by comparing different alternatives. A recursive technique for local model identification and validation is presented, together with an enhanced statistical method for model selection. The shapes and locations of receptive fields are changed in an adaptive manner. The learning capabilities are demonstrated by means of some examples.

关键词： Function approximation Vectors Least squares approximation automatic control Linear regression Neural networks Additive noise systems engineering and theory Statistical analysis Shape

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Intelligent control of a low power D.C. servodrive

Intelligent control of a low power D.C. servodrive

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International Conference on Computational Cybernetics (ICCC)

作者： Silviu Dumitriu Nicolae Constantin Automatic Control and Systems Engineering Department Automatic Control and Computers Faculty University Politehnica of Bucharest Bucharest Romania

ISBN: (纸本)9781424474325;9781424474332

The paper presents the concept and implementation of an intelligent motion controller for a low power brushless servodrive. Fuzzy logic control and fuzzy reasoning tuning procedures are used for speed and current controllers respectively. A digital signal processor (DSP) based hardware set-up and a specialized software environment are used to laboratory experiments. Experimental results proved the effectiveness of the proposed intelligent control scheme.

关键词： Intelligent control automatic control Torque Couplings Rotors Tellurium Servomotors Nonlinear dynamical systems Electromechanical systems Electric motors

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Design of 3D simulator for 2DOF helicopter model control

Design of 3D simulator for 2DOF helicopter model control

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作者： Velagic, Jasmin Osmic, Nedim Zunic, Emir Uzunovic, Tarik Badnjevic, Admir Department of Automatic Control and Electronics Faculty of Electrical Engineering University of Sarajevo Sarajevo Bosnia and Herzegovina

ISBN: (纸本)9789537044114

The paper presents a design of 3D simulator for 2DOF laboratory helicopter model (Humusoft CE 150) and its practical implementation in various control system structures. The developed simulator provides testing performance of different control algorithms and visualization of results obtained. The 3D simulator has been designed and developed using the VRML programming language under the Virtual Reality toolbox in Matlab/Simulink. The effectiveness of this simulator are demonstrated during simulation and experiments on the 2DOF helicopter model using different control techniques, such as PID, adaptive gain scheduling and fuzzy controllers. Some of them have been designed in this paper.

关键词： Virtual reality

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Counting traffic using optical flow algorithm on video footage of a complex crossroad

Counting traffic using optical flow algorithm on video foota...

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作者： Abdagic, Alvin Tanovic, Omer Aksamovic, Abdulah Huseinbegovic, Senad Department for Automatic Control and Electronics Faculty of Electrical Engineering University of Sarajevo Sarajevo Bosnia and Herzegovina

ISBN: (纸本)9789537044114

A practical solution for counting traffic is analysed in this paper. The goal was to develop a solution that focuses on more CPU processing than on placing many complex sensors. This approach should reduce costs of both deployment and maintenance of such system. The proposed solution is to use video footage from a properly placed camera as input data. Vehicle movement is detected using optical flow algorithm. A great deal of post-processing is used to cope with problems that arise from this method of movement detection. Since the video of the entire crossroad is available, it is possible to fully analyse vehicle movement and produce turning movement counts and efficiently estimate (time varying) origin-destination trip tables if enough crossroads are monitored this way. The solution was developed in Simulink using Video and Image Processing Toolbox and custom blocks.

关键词： Optical flows

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Power optimisation control system of wind turbines by changing the pitch angle

Power optimisation control system of wind turbines by changi...

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作者： CatanǍ, Ilie Safta, Carmen-Anca Panduru, Valentin Automatic Control and Computers Faculty University POLITEHNICA of Bucharest Romania Hydraulics Hydraulic Machinery and Environmental Engineering Department Power Engineering Faculty University Politehnica of Bucharest Romania Ecological University of Bucharest Romania

The paper presents a method of power optimization of the wind turbines by changing the pitch angle. There are analysed the structure and the performance of a electro-mechanical servomechanism used to put on position the wind turbine blades so that a maxim out power could be obtained at a given wind speed. Numerical simulations validated the applied method, and the results obtained are comparable with the ones from technical literature.

关键词： Wind turbines

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Implementing demand forecasting

UPB Scientific Bulletin, Series C: Electrical Engineering

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UPB Scientific Bulletin, Series C: Electrical engineering 2010年第4期72卷 13-24页

作者： Dragne, Cristina Moldoveanu, Florica Faculty of Automatic Control and Computers University POLITEHNICA of Bucharest Romania Department of Computer Science and Engineering University POLITEHNICA of Bucharest Romania

Business forecasting uses statistic tools more or less sophisticated that relay on the observation values from the past, regarding the activity level, and calculates predictions for the future. The majority of the methods can calculate forecast without any problem and with high accuracy when the data has a satisfying quality. This paper describes our results in implementing the forecast in general and highlights the cases with sporadic data, cases with a high forecasting need, that are common in real life.

关键词： Forecasting

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An adaptive scheduling approach in distributed systems

An adaptive scheduling approach in distributed systems

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IEEE International Conference on Intelligent Computer Communication and Processing (ICCP)

作者： Alexandra Olteanu Florin Pop Ciprian Dobre Valentin Cristea Faculty of Automatic Control and Computers Computer Science Department University Politehnica of Bucharest Romania

A large number of scheduling algorithms for large scale distributed systems have been proposed, studied and compared. In spite of this, there are few studies comparing the performance of scheduling algorithms considering at the same time the distributed system structure on which we want to schedule the tasks; the type of directed acyclic graph (DAG), in which graph nodes represent tasks and graph edges represent data transfers; and the type of tasks, for example CPU-bound vs. I/O bound. This paper proposes a method for selecting, in a dynamic manner, the most appropriate scheduling algorithm for a particular distributed system, after a previous analysis. Choosing the best known scheduling algorithm can improve performance of an application if all the aspects previously enumerated are considered. The results of this paper consist in a comparison of the scheduling algorithms performance for the following scheduling algorithms: Modified Critical Path, Cluster ready Children First, Earliest Time First, Highest Level First with Estimated Times and Hybrid Remapper Minimum Partial Completion Time Static Priority. However, the main purpose of this investigation tests is to demonstrate the usefulness of the presented scheduling approach using these results.

关键词： Scheduling algorithm Heuristic algorithms Dynamic scheduling Adaptive scheduling Analytical models

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A Distributed Approach to Business Intelligence systems Synchronization

A Distributed Approach to Business Intelligence Systems Sync...

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International Symposium on Symbolic and Numeric Algorithms for Scientific Computing (SYNASC)

作者： Vlad Ciobanu Florin Pop Decebal Popescu Valentin Cristea Computer Science Department Faculty of Automatic Control and Computers University POLITEHNICA of Bucharest Romania

This paper presents a distributed solution of the synchronization of Business Intelligence (BI) systems via networking services. The main problem addressed by the proposed project is to create a common solution that allows automatically redeploying of business intelligence applications among different servers located in the Internet. A case study by using the Microsoft BizTalk Server as a Business Intelligence system is presented included in a research project called PrO Processor. The research came as a necessity because of the lack of support for remote deployment of applications via Internet. Our solution overcomes this issue and presents the synchronization architecture capable of transporting, installing and starting BI applications, orchestrations and ports to any number of BI servers in the Internet.

关键词： Bismuth Servers Synchronization Artificial intelligence Companies Databases

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