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International Symposium on Electronics in Marine (ELMAR)

作者： Emir Sokic Melita Ahic-Djokic Samim Konjicija Faculty of Electrical Engineering Department for Automatic Control and Electronics University of Sarajevo Sarajevo Bosnia and Herzegovina

This paper presents a sound field analysis method which uses numerical solving of the wave equation. The wave equation is described, its analytical and numerical solutions, and its application in sound field analysis. Finite difference method is used for solving the equation. Comparison of analytical and numerical solutions is shown, together with a discussion on convergence and stability of the numerical solution. Finally, the sound field simulator based on numerical solving of wave equation is presented. Applicability of sound field simulator for developing object detection algorithms is also analyzed.

关键词： Propagation Mathematical model Numerical models Partial differential equations Equations Analytical models Boundary conditions

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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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IEEE Region 8 International Conference on Computational Technologies in electrical and Electronics engineering, SIBIRCON

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

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.

关键词： Elevators Copper Floors Availability Hardware Microcontrollers

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Globalization Impact in Technological Changes towards Electric Drive Efficiency

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IFAC Proceedings Volumes 2010年第25期43卷 95-100页

作者： A. Spahiu P. Marango Polytechnic University of Tirana Electrical Engineering Faculty Department of Automatic Control Blvd. Deshmoret e Kombit 4 Tirana Albania

The saving electric energy is an important factor of economic growth, which indicates sustainable growth of the nation's economy. The saving electric energy is one of the main priorities of energy strategy in Albania. One the most important factor there is the efficiency of electric drive. It has great impact on energy security, local and regional air pollution reduction and environment. Actually, Albania is on phase of technology changes in all fields, including industry and service sectors. The best way there is replacement of low efficient electric drive with energy efficient one according to the EU directives. This replacement brings huge potentials of energy saving and globalization impact to the country's economy.

关键词： efficiency electric drive electrical machine energy saving pump variable speed drive

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Decentralized Robust control of Linear Uncertain Systems with Reduced Conservatism

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IFAC Proceedings Volumes 2010年第8期43卷 123-128页

作者： Danica Rosinová Vojtech Vesely Institute of Control and Industrial Informatics Slovak University of Technology Faculty of Electrical Engineering and Information Technology: Bratislava Slovak Republic

In this paper a novel decentralized robust control design scheme is proposed, considering the structured uncertain system matrix with a constant part (typical case for a system with dynamic controller as PID); the resulting robust control design is based on developed robust stability LMI condition which is less conservative than those from literature. In the following we use parameter dependent Lyapunov function and structured auxiliary matrices to receive “structured robust stability condition” which is the base for robust controller design. All developments are performed in general formulation including both discrete-time and continuous-time systems.

关键词： Robust control Parameter dependent Lyapunov function Polytopic uncertainty domain Linear matrix inequalities Bilinear matrix inequalities

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A brain computer interface for communication using real-time fMRI

A brain computer interface for communication using real-time...

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2010 20th International Conference on Pattern Recognition, ICPR 2010

作者： Eklund, Anders Andersson, Mats Ohlsson, Henrik Ynnerman, Anders Knutsson, Hans Division of Medical Informatics Department of Biomedical Engineering Linköping University Sweden Division of Automatic Control Department of Electrical Engineering Linköping University Sweden Division for Visual Information Technology and Applications Department of Science and Technology Linköping University Sweden Linköping University Sweden

ISBN: (纸本)9780769541099

We present the first step towards a brain computer interface (BCI) for communication using real-time functional magnetic resonance imaging (fMRI). The subject in the MR scanner sees a virtual keyboard and steers a cursor to select different letters that can be combined to create words. The cursor is moved to the left by activating the left hand, to the right by activating the right hand, down by activating the left toes and up by activating the right toes. To select a letter, the subject simply rests for a number of seconds. We can thus communicate with the subject in the scanner by for example showing questions that the subject can answer. Similar BCI for communication have been made with electroencephalography (EEG). In these implementations the subject for example focuses on a letter while different rows and columns of the virtual keyboard are flashing. The system then tries to detect if the correct letter is flashing or not. In our setup we instead classify the brain activity. Our system is not limited to a communication interface, but can be used for any interface where five degrees of freedom is necessary. © 2010 IEEE.

关键词： Brain computer interface

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Parameter Optimization of FES-Assisted Indoor Rowing Exercise Using MOGA

Parameter Optimization of FES-Assisted Indoor Rowing Exercis...

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Asia International Conference on Modeling & Simulation

作者： Zakaria Hussain M. Osman Tokhi Rozita Jailani Fadzil Ahmad Department of Automatic Control and System Engineering University of Sheffield UK Faculty of Electrical Engineering Universiti Teknologi Mara Malaysia

ISBN: (纸本)9781424471966;9780769540627

This paper describes the parameter optimization of fuzzy logic control (FLC) of FES-assisted indoor rowing exercise (FES-rowing) using multi objective genetic algorithm (MOGA). The indoor rowing exercise is introduced as a total body exercise for rehabilitation of function of lower extremities through the application of functional electrical stimulation (FES). FLC is used to control the knee and elbow trajectories for smooth rowing manoeuvre. MOGA is implemented in Matlab with a dynamic simulation model of indoor rowing exercise is developed using Visual Nastran (vN4D) software environment. MOGA is used to optimize the FES-rowing with two objective functions specified that are i) to minimize the mean squared error of knee angle trajectory and ii) to minimize the total electrical stimulation required by the muscles. In view of good results obtained, it is concluded that MOGA is able to obtain the optimal design of FLC for FES-rowing with two conflicting objectives.

关键词： Knee Fuzzy logic Genetic algorithms Extremities Application software Neuromuscular stimulation Elbow Mathematical model electrical stimulation Muscles

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Design and implementation of three-dimensional simulator for control of laboratory model helicopter

Design and implementation of three-dimensional simulator for...

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Proceedings of the International Convention MIPRO

作者： A. Badnjević E. Z̆unić T. Uzunović N. Osmić Faculty of Electrical Engineering in Sarajevo Department of Automatic Control and Electronics University of Sarajevo Sarajevo Bosnia and Herzegovina Department of Automatic Control and Electronics University in Sarajevo Sarajevo Bosnia and Herzegovina

The paper discusses the problems of design and implementation of three-dimensional simulator for control of laboratory model helicopter. The research is realized under student project at the Department of automatic control and Electronics of faculty of electrical engineering in Sarajevo. For this purpose the HUMUSOFT CE150 laboratory helicopter model was used. In order to verify various control algorithms the 3D simulator is designed. Simulator was developed in Matlab/Simulink environment using the Virtual Reality Modelling Language (VRML). Three-dimensional helicopter was built by using 3D Studio Max script. The quality of this simulator is tested during the helicopter motion with PID controllers.

关键词： Laboratories Helicopters Virtual reality Mathematical model Communication system control automatic control control systems Graphical user interfaces Electronic mail Algorithm design and analysis

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Development of secure encoder-decoder for JPEG images

Development of secure encoder-decoder for JPEG images

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International Conference on Computer engineering and Systems

作者： Ghada Hamissa Amany Sarhan Hatem Abd Elkader Mahmoud Fahmy Electrical Engineering Department Faculty of Engineering KFS University Kafr el-Sheikh Egypt Information System Department Faculty of Computer & Information Menoufia University Menoufia Egypt Computer & Automatic Control Department Computer & Automatic Control Department Tanta University Tanta Egypt Computer & Automatic Control Department Faculty of Engineering Tanta University Tanta Egypt

Digital image copyrights and image authentication draw a great attention specially in critical image communications. This paper presents a proposal for a new encoder-decoder, which we call SecEncoDeco, for securing JPEG images. An extra stage of security is embedded in the traditional JPEG codec. This security stage uses the Secure Hill cipher technique. This encryption technique has many advantages over the traditional Hill cipher. The Safe Time of the Secure Hill cipher is deduced and presented in detail. Implementation of the proposed method is built based on MATLAB. Complete evaluation for the proposed codec is performed which indicates the effectiveness of the proposed secure codec for image copyright protection.

关键词： Image coding Encryption Transform coding Computer architecture Decoding Time measurement

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PID control of Knee Extension for FES-Assisted Walking with Spring Brake Orthosis

PID Control of Knee Extension for FES-Assisted Walking with ...

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Asia International Conference on Modeling & Simulation

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

ISBN: (纸本)9781424471966

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.

关键词： Three-term control Knee Legged locomotion Springs Muscles Motion control Mathematical model Wheels Torque control Neuromuscular stimulation

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Fuzzy logic control of knee extension for FES-assisted walking with spring brake orthosis

Fuzzy logic control of knee extension for FES-assisted walki...

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IEEE International Conference on Systems, Man and Cybernetics

作者： R. Jailani M.O. Tokhi S.C. Gharooni Department of Automatic Control and system Engineering University of Sheffield UK Faculty of Electrical Engineering Universiti Teknologi MARA Shah Alam MALAYSIA

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. Fuzzy logic control (FLC) 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 FLC is found to be appropriate controller for the leg extension.

关键词： Niobium Variable speed drives Muscles

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