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International Symposium on applied Computational Intelligence and informatics ( SACI)

作者： Emil-Ioan Voisan Radu-Emil Precup Florin Dragan Dept. of Automation and Applied Informatics Politehnica University of Timisoara Timisoara Romania

ISBN: (纸本)9781509023813

Facial expression recognition is an important research domain in developing human-machine relations. This paper proposes a facial expression recognition system. This system is built using Constrained Local Models to fit the shapes on a face image and on Support Vector Machines (SVMs) to detect the face expressions. Different SVM architectures and trainings have been used including applying outliers filtering to obtain better recognition rates.

关键词： Face Support vector machines Training Shape Active appearance model Face recognition Feature extraction

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Optimization of PWM for overmodulation region of two-level inverters

Optimization of PWM for overmodulation region of two-level i...

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International (EPE-PEMC) Power Electronics and Motion Control Conference

作者： Péter Stumpf Sándor Halász Dept. of Automation and Applied Informatics (AAI) Budapest University of Technology and Economics Dept. of Electric Power Engineering Budapest University of Technology and Economics

ISBN: (纸本)9781509017997

Two optimized PWM techniques for the overmodulation region of two-level inverter-fed ac drives are investigated from harmonic loss minimization point of view. The optimization is elaborated for the lowest loss-factor, which is proportional to the square of rms value of current harmonics. The loss-factors are computed for different switching numbers as the function of the motor fundamental voltage. It is shown that, respect to the motor heating and torque ripples, the acceptable drive condition can be guaranteed by relatively low value of inverter switching frequency up to 96-97% of maximal possible motor voltage. Furthermore, it is shown that, the so-called Three vector method, introduced in the paper, has considerably better performance in the lower part of the overmodulation region than the so-called Two vector method or the standard PWM techniques for the same number of switching. The theoretical results are verified by experimental tests.

关键词： Harmonic analysis Pulse width modulation Inverters Switching frequency Switches Torque AC motors

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Multi-level dynamic instantiation for resolving node-edge dichotomy

Multi-level dynamic instantiation for resolving node-edge di...

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International Conference on Model-Driven Engineering and Software Development (MODELSWARD)

作者： Zoltan Theisz Gergely Mezei Huawei Design Centre Athlone Ireland Dept. of Automation and Applied Informatics Budapest University of Technology and Economics Budapest Hungary

ISBN: (纸本)9781509058983

The core idea of metamodel-based model construction is well established. However, there are different metamodeling approaches relying on various modeling structures and instantiation procedures. Although, in general, these approaches offer similar features, they are sometimes incompatible with each other. Therefore, a precise abstract definition of instantiation is needed. The paper describes an abstract modeling framework, which is easily customizable in order to adapt it to different multi-level modeling techniques. The framework consists of an abstract modeling structure, basic built-in constructs, and a dynamic instantiation procedure. The paper demonstrate the flexibility of the approach by a specific bootstrap that is explicitly designed for the rebalancing of the node-edge antagonism, which is mostly the origin of many reification patterns applied in current meta-model designs. Although the proposed solution to the node-edge dichotomy is only an example of our multi-level meta-modeling approach, it is per se a valuable achievement showing that it can be done in a more elegant manner than it is usually expressed in other state-of-the art modeling frameworks.

关键词： Metamodeling Algebra Topology Adaptation models Pragmatics Cloud computing

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Multicast dataset synchronization and agent negotiation in distributed manufacturing control systems

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IFAC-PapersOnLine 2015年第3期48卷 1087-1092页

作者： Morariu, Octavian Morariu, Cristina Borangiu, Theodor Raileanu, Silviu University Politehnica of Bucharest Dept. of Automation and Applied Informatics Romania LoudTroopers International Romania

Multi agent systems represent an elegant approach for the control architecture of manufacturing systems. Distributed control architectures have the potential to achieve greater flexibility by being capable of local decision making based on real time reasoning. One of the main challenges of these distributed architectures is represented by the capability to synchronize the production data across all execution points in a reliable and consistent fashion. In this context, this paper aims to resolve the problems associated with real time production data synchronization in distributed multi-agent control systems by proposing a common dataset synchronized across all agent entities using multicast network communication. On top of this common dataset approach, an agent negotiation mechanism is proposed that addresses the operation sequencing and resource allocation in decentralized operation model. The pilot implementation is using JADE multi agent platform and JGroups for real time data synchronization and NetLogo for abstract representation of the simulation system. Experimental results gathered from the pilot implementation are discussed. © 2015, IFAC (International Federation of Automatic Control) Hosting by Elsevier Ltd. All rights reserved.

关键词： Multi agent systems

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Evolving fuzzy models for the position control of twin rotor aerodynamic systems

Evolving fuzzy models for the position control of twin rotor...

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IEEE International Conference on Industrial informatics (INDIN)

作者： Radu-Emil Precup Mircea-Bogdan Radac Emil M. Petriu Raul-Cristian Roman Teodor-Adrian Teban Alexandra-Iulia Szedlak-Stinean Dept. of Automation and Applied Informatics Politehnica University of Timisoara Timisoara Romania School of Electrical Engineering and Computer Science University of Ottawa Ottawa Canada

ISBN: (纸本)9781509028719

This paper proposes a set of evolving Takagi-Sugeno-Kang (TSK) fuzzy models of the nonlinear dynamics specific to the azimuth and position of Multi Input-Multi Output (MIMO) twin rotor aerodynamic systems. Separate Multi Input-Single Output (MISO) fuzzy models of the azimuth and pitch positions are derived for this MIMO system. The rule bases and the parameters of the MISO TSK fuzzy models are evolved by an online identification algorithm (OIA) that belongs to the class of incremental OIAs, which implement adding mechanisms. The experimental results conducted on aerodynamic system laboratory equipment prove the performance of the TSK fuzzy models by good output responses and root mean square error values. A performance comparison with a set of MISO TSK fuzzy models evolved by another incremental OIA is included.

关键词： Azimuth Aerodynamics Adaptation models Rotors Mathematical model MIMO Heuristic algorithms

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Path calculation of 4 DOF remote vehicle for educational purpose 13

Path calculation of 4 DOF remote vehicle for educational pur...

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13th IEEE International Symposium on applied Machine Intelligence and informatics, SAMI 2015

作者： Şandru, Lucian Alexandru Crainic, Marius-Florin Preitl, Stefan Dolga, Valer Dept. of Mechatronics Politehnic University of Timisoara Timisoara Romania Dept. of Automation and Applied Informatics Politehnic University of Timisoara Timisoara Romania

ISBN: (纸本)9781479982219

In the modern world of today, technology means everything. It comes in many shapes and sizes: from tablets, smartphones, laptops, cars that drive themselves and flying drones. The world around us is becoming more and more interested in new inventions. With this, there is a growing need for innovations to help firefighters, doctors, automotive and people from other areas. The paper presents an alternative way of controlling a 4 DOF vehicle that can be used for educational purposes. The main characteristics of this vehicle is that the user draw the path on PC and the vehicle follow that path. © 2015 IEEE.

关键词： Vehicles

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Model predictive controllers for magnetic levitation systems

Model predictive controllers for magnetic levitation systems

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International Symposium on applied Computational Intelligence and informatics ( SACI)

作者： Simona Sgaverdea Claudia-Adina Bojan-Dragos Radu-Emil Precup Stefan Preitl Alexandra-Iulia Stinean Dept. of Automation and Applied Informatics Politehnica University of Timisoara Timisoara Romania

The paper presents the design and the implementation of two model predictive controllers (MPCs) for magnetic levitation systems. The presentation is focused on the position control of a sphere in a magnetic levitation system with two electromagnets laboratory equipment in order to test the proposed controllers. A state feedback control structure is first designed to stabilize the system. In order to ensure the zero steady-state control errors, the second controller is based on an MPC in the outer control loop. The autoregressive exogenous model corresponding to closed-loop state feedback control system is computed in order to develop the MPC. The simulation results are included to illustrate the performance of the position control systems.

关键词： Magnetic levitation Magnetic materials Photonic crystals State feedback Predictive models Electromagnets

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Ergonomic operating mode for a robot arm using a game-pad with two joysticks

Ergonomic operating mode for a robot arm using a game-pad wi...

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International Symposium on applied Computational Intelligence and informatics ( SACI)

作者： Marius-Florin Crainic Stefan Preitl Dept. of Automation and Applied Informatics “Politehnica” University of Timisoara Timisoara Romania

Due to the continuous technological progress, life becomes more comfortable. The fact is also valid for robotized technological lines where workers have to command and control the movement of robots and robotic arms. In this context, the paper presents an alternative way of controlling a mechanical Rv-2AJ robot arm, applicable mainly for locally controlled robots. The main characteristics of the application are an ergonomic operating mode, video and tactile feedback control, low price; the application can have also a didactical purpose, and can offer a highly useable material for mechatronic laboratories for students teaching.

关键词： Robot kinematics Joints Software Laboratories Ergonomics Service robots

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ROS-based robot navigation and human interaction in indoor environment

ROS-based robot navigation and human interaction in indoor e...

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International Symposium on applied Computational Intelligence and informatics ( SACI)

作者： Emil-Ioan Voisan Bogdan Paulis Radu-Emil Precup Florin Dragan Dept. of Automation and Applied Informatics Politehnica University of Timisoara Timisoara Romania

This paper sets the basis of a robot collaborative application framework that is able to perform basic interactions with a human partner, namely patrol and monitor a designated area, followed by interaction with a human participant when this is detected. The application is developed using an adaptation of ROS to Corobot robot and image processing techniques that involve OpenCV face detection.

关键词： Navigation Robot kinematics Simultaneous localization and mapping Face detection

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Comparing genetic operators for the timetabling problem

Comparing genetic operators for the timetabling problem

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International Symposium on applied Machine Intelligence and informatics (SAMI)

作者： Attila Hideg Dept. of Automation and Applied Informatics Budapest University of Technology and Economics Budapest Hungary

This paper describes a genetic algorithm used to solve the timetabling problem. Our approach will deal with the weekly curriculum based timetabling problem using real datasets from the University of Udine. Before prop... 详细信息

关键词： Biological cells Genetics Sociology Statistics Genetic algorithms Optimization Testing

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