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International Conference on system Theory, control, and Computing (ICSTCC)

作者： Ciprian Vlad Adriana Burlibaşa Romeo Păduraru Silviu Epure Cristinel Dache Cristian Victor Lungu Lucian Puiu Georgescu Gabriel Murariu Department of Automatic Control and Electrical Engineering “Dunărea de Jos” University of Galaţi 47 Domneascǎ Galaţi Romania Department of Electronics and Telecommunications Faculty of Automatic control Computers Electrical Engineering and Electronics “Dunărea de Jos” University of Galaţi 47 Domneascǎ Galaţi Romania Department of Physics Chemistry and Environment Faculty of Sciences and Environment “Dunărea de Jos” University of Galaţi 47 Domneascǎ Galaţi Romania

This paper aims to presents the results obtained in electromechanical wind speed emulator of distributed low power system. The results are obtained in insulated regime with a step up/down converter, battery bank and resistive load. All the operating regions are aimed, namely optimization and power limitation one, and also an intermediate operating region is considered in order to ensure smooth transition between these two regions. For control purpose an improved strategy is proposed. Hardware implementation is done under DS1103 controller board running under Matlab and controlDesko ® software. This paper present results from a functional low power wind system, part of a distributed multisource low power system, which offer also the possibility of implementing the behavior and the control of such systems, in grid-connected or disconnected from the national grid. Experimental results show the effectiveness of the proposed system under various conditions.

关键词： Velocity control Wind speed Wind turbines Batteries Optimization Choppers (circuits) Power systems

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Secure web access control algorithm

arXiv

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arXiv 2018年

作者： Ioan, Filip Iosif, Szeidert Cristian, Vasar Department of Control System Engineering "politehnica" University of Timisoara Faculty of Automation and Computers Bv. V. Parvan No.2 Timisoara300223

The paper presents a flexible and efficient method to secure the access to a Web site implemented in PHP script language. The algorithm is based on the PHP's session mechanism. The proposed method is a general one and offers the possibility to implement a PHP based secured access to a Web site, through a portal page and using an additional script included in any site's page, which is required to be accessed only by registered users. This paper presents the design, implementation and integration of the algorithm on any generic WEB site. Copyright © 2018, The Authors. All rights reserved.

关键词： Websites

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Electrical energy prediction study case based on neural networks

arXiv

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arXiv 2018年

作者： Vasar, Cristian Prostean, Octavian Filip, Ioan Szeidert, Iosif Department of Control System Engineering "Politehnica" University of Timisoara Faculty of Automation and Computers Bv. V. Parvan No.2 Timisoara1900 Romania

This paper presents some considerations regarding the prediction of the electrical energy consumption. It is well known that the central element of a microeconomic analysis is represented by the economical agents actions, actions that follow their own interest such as: the consumer – maximization of his satisfaction, the producer – maximization of his profit. The study case is focused on the prediction of the sold energy in Banat region. The goal of this study case is to optimize the electrical energy quantity purchased from the producer by the energy distributor in Banat region. The prediction is based on neural networks. There are used feed-forward and Elman type neural networks. In order to enhance the prediction accuracy there have been used both linear and nonlinear preprocessing units. The aspects considered in this paper can be extrapolated in any general case of prediction-based application, not only in the already stated case of electrical energy. Copyright © 2018, The Authors. All rights reserved.

关键词： Forecasting

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Classification of an imbalanced data set using decision tree algorithms

UPB Scientific Bulletin, Series C: Electrical Engineering an...

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UPB Scientific Bulletin, Series C: Electrical engineering and Computer Science 2017年第4期79卷 69-84页

作者： Truicǎ, Ciprian-Octavian Leordeanu, Cǎtǎlin Adrian Computer Science and Engineering Department Faculty of Automatic Control and Computers University Politehnica of Bucharest Bucharest Romania

Machine learning algorithms have recently become very popular for different tasks involving data analysis, classification or prediction. They can provide valuable knowledge for very large sets of data and can reach very good accuracy. However, most algorithms are sensitive to the nature of the data sets, as well as different calibrations which can lead to large differences in performance, accuracy or false positives. In this paper, a classification solution for imbalanced data sets containing information about defects of various trees is presented. The experimental results present a comparison that evaluates the classification performance of the Decision Tree, Random Forest, and Extremely Randomized Trees classifiers. The measures used in the comparison take into account weighted accuracy, precision, and recall for binary and multi-class classification.

关键词： Classification (of information)

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Development of an Unmanned Vertical Take-Off and Landing Aircraft for Medical Express UAV Challenge

Development of an Unmanned Vertical Take-Off and Landing Air...

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International Conference on Methods and Models in Automation and Robotics (MMAR)

作者： Roman Czyba Marcin Lemanowicz Michał Simon Tomasz Kudala Zbigniew Gorol Maciej Galeja Karol Hanke Adam Sikora Wojciech Grabowski Łukasz Ryczko Mateusz Żurawski Paulina Kapała Karol Kreihs Piotr Langner Department of Automatic Control Silesian University of Technology Gliwice Poland Department of Chemical Engineering and Process Design Silesian University of Technology Gliwice Poland Faculty of Mechanical Engineering Silesian University of Technology Gliwice Poland

This paper presents a design process of unmanned vertical take-off and landing aircraft, developed by the High Flyers team from Silesian University of Technology, who decided to participate in the Medical Express UAV Challenge competition. The designed system is described as a hybrid platform, where different operating modes correspond to the vertical flight, transition and spatial flight in the airframe system. Explanation of an iterative design process with the contribution of CAD design, CFD analysis and control system design in particular flight modes is presented. Simulation results are carried out to corroborate the design control system. Finally, the fast prototyping of proposed control strategy as well as manufacturing process is shown.

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A Robust MPP Tracker Based on Sliding Mode control for a Photovoltaic Based Pumping system

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International Journal of Automation and computing 2017年第4期14卷 489-500页

作者： Farhat Maissa Oscar Barambones Sbita Lassad Aymen Fleh Department of Electrical Electronics and Communications Engineering American University of Ras A1 Khaimah Ras AI Khaimah 10021 UAE Advanced Control Group Faculty of Engineering of Vitoria-Gasteiz University of the Basque Country Bilbao Spain Electrical and Automatic Engineering Department Engineering School of Gabes University of Gabes Zrig Gabes 6029 Tunisia

In this paper, a mathematical model of the photovoltaic （PV） pumping system＇s main components is firstly established. Then, the design of maximum power point tracking （MPPT） stage that ensures battery charging is described. This work is motivated by the need of photovoltaic generator （PVG） that efficiently extracts maximum power. The PVG is a special source of energy which has nonlinear current-voltage characteristics depending on variations in temperature and solar irradiance. In order to achieve the MPPT operating goals, a special interest is focused on the variable structure sliding mode （SM） control strategy and the classic perturb and observe （P＆O） algorithm. The permanent magnet synchronous motor （PMSM） is selected as a pump driver. The field oriented control is performed as the motor drive strategy. Simulation results show a high level of efficiency, obtained with the proposed PV based pumping system. The performance comparison between SM controller and P＆O controller has been carried out to demonstrate the effectiveness of the former in drawing more energy and a fast response against irradiation disturbances.

关键词： Photovoltaic （PV） pump storage battery boost sliding mode control （SMC） maximum power point tracking （MPPT）.

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Formative assessment application with social media integration using computer adaptive testing techniques 12

Formative assessment application with social media integrati...

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12th International Conference on e-Learning, ICEL 2017

作者： Dascalu, Maria-Luliana Nitu, Melania Alecu, Gabriel Bodea, Constanta-Nicoleta Moldoveanu, Alin Dragos Bogdan Department of Engineering in Foreign Languages Faculty of Engineering in Foreign Languages University Politehnica of Bucharest Romania Department of Economic Informatics and Cybernetics Faculty of Economic Cybernetics Statistics and Informatics Bucharest University of Economic Studies Romania Computer Science and Engineering Department Faculty of Automatic Control and Computers University Politehnica of Bucharest Romania

ISBN: (纸本)9781911218357

Individual instruction is recognized as an effective learning method which is highly supported by the so-called personalized, intelligent or adaptive systems. The main purpose of this learning method is to offer customized content, experience or tools, based on the learning profile of students (learning style, gender, prior knowledge, learning goals and so on), so as to improve the learning outcomes. There are two wide-known adaption techniques implemented by learning systems to provide individual instruction: adaptability and adaptivity. The first one allows the students to take control, e.g. The learning system provides choices to let the students adapt the steps, sequences, difficulty level, preferences, while the second empowers the system, which is able to build a student model and to provide learning support based on that model. The current paper presents PoliCAT-A learning system based on Computer Adaptive Testing (CAT) principle, which implements the second adaption technique (adaptivity) to provide individual instruction. Furthermore, the proposed web-based application supports the new learning paradigms, e.g. student-centered learning, communities of practice, and constructivism in general and relies on the current technologies-Web 2.0 and social Web, as students are able to share one's results on social media. The system is described as a useful tool for self-regulated learning, answering thus at the question whether assessment may have a strong formative role in learning or not. Besides highlighting the key features of the application, the paper provides experimental results from a web programming course for forth year students enrolled in an engineering degree program, who used the developed system as a learning tool during one semester. Students reported that they succeeded in strengthening their study skills and monitoring their academic progress through the learning analytics features. The available personalized feedback PoliCAT, as well as the possi

关键词： Students

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Renewable (REW) / Fuel Cell (FC) Hybrid Power system with mitigation of the REW variability by the FC fuel flow control

Renewable (REW) / Fuel Cell (FC) Hybrid Power System with mi...

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International Conference on Electronics, computers and Artificial Intelligence (ECAI)

作者： Nicu Bizon Alin Gheorghita Mazare Ionescu Mihai Laurentiu Mihai Oproescu Jose Manuel Lopez-Guede Mihai Varlam Mircea Raceanu Hoarcă Ioan Cristian Faculty of Electronics Communication and Computers University of Pitesti Pitesti Romania National Research and Development Institute for Cryogenics and Isotopic Technologies ICIT Rm. Valcea Romania Systems Engineering and Automatic Control Department University of the Basque Country (UPV/ EHU) Vitoria Spain University Politehnica of Bucharest Bucharest Romania

ISBN: (纸本)9781538649022;9781538649015

A new Energy Management Strategy is proposed for Hybrid Power system based on Renewable Energy Sources and Proton Exchange Membrane Fuel Cell system used as backup source. The Energy Management Strategy uses a Load Following control loop of needed energy on DC bus (p load -p RES ) and an optimization control loop to improve the fuel economy based on Global Extremum Seeking algorithm. The performance of proposed strategy is compared with that obtained with the Static Feed-Forward strategy using different scenarios for power flow on DC bus (variable renewable power profile and constant or variable load demand).

关键词： Topology Optimization Fuels Germanium Energy management Hybrid power systems Band-pass filters

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Fuel Cell (FC) Hybrid Power system with mitigation of the load power variability by the FC fuel flow control

Fuel Cell (FC) Hybrid Power System with mitigation of the lo...

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International Conference on Electronics, computers and Artificial Intelligence (ECAI)

作者： Nicu Bizon Jose Manuel Lopez-Guede Ioan Cristian Hoarc Mihai Culcer Mariana Iliescu Faculty of Electronics Communication and Computers University of Pitesti Pitesti Romania Systems Engineering and Automatic Control Department University of the Basque Country (UPV/ EHU) Vitoria Spain University Politehnica of Bucharest Bucharest Romania National Research and Development Institute for Cryogenics and Isotopic Technologies ICIT Rm. Valcea Romania

ISBN: (纸本)9781538649022;9781538649015

A new Energy Management Strategy is proposed for Hybrid Power systems with a Proton Exchange Membrane Fuel Cell system used as backup source. The Energy Management Strategy uses a Load Following control loop of load demand needed on DC bus (pload) and an optimization control loop to improve the fuel economy based on Global Extremum Seeking algorithm. The performance of proposed strategy is compared with that obtained with the Static Feed-Forward strategy using different scenarios for constant or variable load demand, and three case studies considered for the optimization function.

关键词： Optimization Germanium Fuel economy Topology Energy efficiency Hydrogen

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control system Charge-Discharge Lithium-ion Batteries

Control System Charge-Discharge Lithium-ion Batteries

引用

Conference of Russian Young Researchers in Electrical and Electronic engineering

作者： Tatyana P. Rudneva Aleksey A. Leuta Andrey N. Lukichev Faculty of Electrotechnical and Automatic Department of Control Automatic System Saint Petersburg Electrotechnical University "LETI" Saint Petersburg Russia

Outlines the progress and results of the development of controlling battery systems, battery to automate charge-discharge processes, resource monitoring, improving the reliability and security of production and operat... 详细信息

ISBN: (纸本)9781509048663

关键词： lithium-ion battery balancing system chemical current source

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