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IEEE International Symposium on Industrial Electronics (ISIE)

作者： Sanjeevikumar Padmanaban Michael R. Hontz Raghav Khanna Patrick William Wheeler Frede Blaabjerg Joseph Olorunfemi Ojo Power Electronics Division Ohm Technologies Chennai India Electrical Engineering & Computer Science Dept. University of Toledo Toledo Ohio USA Power Electronics Machines and Control Group (PEMC) Nottingham University UK Center for Reliable Power Electronics (CORPE) Aalborg University Denmark University of KwaZulu-Natal Durban South Africa Dept. of Electrical & Computer Engg. Tennessee Technological University USA

This article presents the developments of a novel isolated/non-isolated quad inverter configuration for multilevel dual six-phase (twelve-phase) star-winding converter. The modular circuit consists of four standard voltage source inverters (VSIs). Each VSI is incorporated with one bi-directional switch (MOSFET/IGBT) per phase and links with the neutral line through two capacitors which allows symmetrical and asymmetrical operations. A modified single carrier five-level modulation (MSCFM) algorithm is developed and modulates each 2-level VSI as a 5-level output multilevel inverter. The entire AC converter is numerically modeled using Matlab/PLECS simulation software and the predicted behavior of the system is analyzed and presented. Good agreement is obtained between these results and the theoretical analysis. Suitable applications for the converter include (low-voltage/high-current) medium power systems, electrical vehicles, AC tractions, and `More-Electric Aircraft' propulsion systems.

关键词： Inverters Windings Standards Switches Modulation Reliability Capacitors

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Agent based simulation applied to the design of control systems for emergency vehicles access

Agent based simulation applied to the design of control syst...

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International Conference on ITS Telecommunications (ITST)

作者： Monica Patrascu Andreea Ion Vlad Constantinescu Dept. of Automatic Control and Systems Engineering University Politehnica of Bucharest Romania

Traffic congestions have huge impact on urban transportation and are even more problematic when emergency vehicles are present, their fast travel requirements disrupting regular traffic. The aim of this study is to formulate an agent based simulation perspective on aiding the design of complex and distributed control systems, such as the one facilitating the arrival of the emergency vehicles to accident sites. Thus, we provide a user friendly method for validation of traffic control systems that supports interdisciplinary design. In particular, such a simulation model can be easily used by transportation engineers not acquainted with the mechanics of control systems, as it allows for empirical transfer of knowledge from the ITS field into controller synthesis methodology.

关键词： Vehicles control systems computer architecture Roads Collaboration Microprocessors Modeling

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Diagnosis of wind turbine rotor system

Diagnosis of wind turbine rotor system

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American control Conference

作者： Henrik Niemann Mahmood Mirzaei Lars Christian Henriksen Niels Kjolstad Poulsen Dept. of Electrical Engineering Automation and Control Build. 326 Technical University of Denmark DK-2800 Kgs. Lyngby Denmark Dept. of wind energy Technical University of Denmark DK-2800 Kgs. Lyngby Denmark AF Consult Lyskaer 3F 2730 Herlev Denmark Dept. of Applied Mathematics and Computer Science Technical University of Denmark DK-2800 Kgs. Lyngby Denmark

ISBN: (纸本)9781467386838

This paper describes a model free method for monitoring and fault diagnosis of the elements in a rotor system for a wind turbine. The diagnosis as well as the monitoring is done without using any model of the wind turbine and the applied controller or a description of the wind profile. The method is based on available standard sensors on wind turbines. The method can be used both on-line as well as off-line. Faults or changes in the rotor system will result in asymmetries, which can be monitored and diagnosed. This can be done by using the multi-blade coordinate transformation. Changes in the rotor system that can be diagnosed and monitored are: actuator faults, sensor faults and internal blade changes as e.g. change in mass of a blade.

关键词： Wind turbines Monitoring Sensors Rotors Fault diagnosis Blades Aerodynamics

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From high-level task descriptions to executable robot code

Advances in Intelligent Systems and Computing

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Advances in Intelligent Systems and Computing 2015年 323卷 189-202页

作者： Stenmark, Maj Malec, Jacek Stolt, Andreas Dept. of Computer Science Lund University Lund221 00 Sweden Dept. of Automatic Control Lund University Lund221 00 Sweden

For robots to be productive co-workers in the manufacturing industry, it is necessary that their human colleagues can interact with them and instruct them in a simple manner. The goal of our research is to lower the threshold for humans to instruct manipulation tasks, especially sensor-controlled assembly. In our previous work we have presented tools for high-level task instruction, while in this paper we present how these symbolic descriptions of object manipulation are translated into executable code for our hybrid industrial robot controllers. © Springer International Publishing Switzerland 2015.

关键词： Robots

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An integrated gene expression analysis approach

An integrated gene expression analysis approach

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E-Health and Bioengineering Conference

作者： Irina-Oana Petre Catalin Buiu Dept. of Automatic Control and Systems Engineering Politehnica University of Bucharest Bucharest Romania

ISBN: (纸本)9781467375467

Big data is one of the hottest topics in information science. It has become the key for biological and medical discovery and research, making developing new methods for data management, analysis and accessibility a great challenge in the field. This study proposes an integrated gene analysis approach, in terms of classification and prediction methods for understanding, analyzing and interpretation of biological data related to cancer. The final aim of this study is to predict and classify several subtypes of cancer, based on gene expression.

关键词： Big data Data mining Gene expression clustering pattern

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automatic detection of meteors in spectrograms using artificial neural networks

Automatic detection of meteors in spectrograms using artific...

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International Symposium on Applied Computational Intelligence and Informatics ( SACI)

作者： Victor Ştefan Roman Cătălin Buiu Dept. of Automatic Control and Systems Engineering Politehnica University of Bucharest Bucharest Romania

Artificial neural networks are widely used in classification problems due to their adaptability. In this paper, an original multi-layer perceptron is used to automatically detect meteors within radio recordings. The approach presented can be divided into two stages: data preparation and meteor detection. In the data preparation stage, samples are built from a number of the spectrogram's vertical lines. During the meteor detection stage, neural networks are trained using the inputs previously extracted, and their meteor detection capabilities are tested. The rate of correctly detected meteor samples by the neural networks trained in this paper is over 80%.

关键词： Spectrogram Training Artificial neural networks Neurons Airplanes Biological neural networks

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Reduced Relative Errors for Short Sequence Counting with Differential Privacy

Reduced Relative Errors for Short Sequence Counting with Dif...

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International Conference on control Systems and computer Science (CSCS)

作者： Sergiu Costea Gabriel Ghinita Rvzvan Rughinis Nicolae Tapus Faculty of Automatic Control and Computer Science University POLITEHNICA of Bucharest Dept. of Computer Science University of Massachusetts Boston

Current concerns about data privacy have lead to increased focus on data anonymization methods. Differential privacy is a new mechanism that offers formal guarantees about anonymization strength. The main challenge when using differential privacy consists in the difficulty in designing correct algorithms when operating on complex data types. One such data type is sequential data, which is used to model many actions like location or browsing history. We propose a new differential privacy algorithm for short sequence counting called Recursive Budget Allocation (RBA). We show that RBA leads to lower relative errors than current state of the art techniques. In addition, it can also be used to improve relative errors for generic differential privacy algorithms which operate on data trees.

关键词： Databases Data privacy Privacy Noise Resource management Vegetation Estimation

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A self-organizing map-based approach to automatic meteor detection in radio spectrograms

A self-organizing map-based approach to automatic meteor det...

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

作者： Victor Ştefan Roman Cătălin Buiu Dept. of Automatic Control and Systems Engineering Politehnica University of Bucharest Bucharest Romania

The automatic meteor detection solution presented in this paper uses a self-organizing map to analyze radio spectrogram data and detect the meteor samples found within. This artificial neural network is trained using data samples extracted from spectrograms of radio recordings using a rectangular sliding window. Several tests were run to find the optimal neural network topology and duration of training. The trained network is then analyzed using a new set of data and its performance is manually validated. Testing has shown that the proposed self-organizing map solution produces significant meteor detection results.

关键词： Training Spectrogram Neurons Data mining Artificial neural networks Visualization

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On the comparison of location based software solutions used for tracking purposes in ambient assisted living applications

On the comparison of location based software solutions used ...

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

作者： Vasos Hadjioannou Constandinos X. Mavromoustakis Katerina Papanikolaou George Mastorakis Rossitza Goleva Ciprian Dobre Jordi Mongay Batalla Department of Computer Science University of Nicosia Nicosia Cyprus European University Cyprus Nicosia Nicosia CY Dept. of Computer Science and Engineering European University Cyprus Nicosia Cyprus Technical University of Sofia Bulgaria Faculty of Autonomic Control and Computers University Politehnica of Bucharest Bucharest Romania National Institute of Telecommunications Warsaw University of Technology Poland

ISBN: (纸本)9781509039005

Wearable and handheld devices, such smart phones, have come a long way in a very short time as they are capable of providing an extremely vast number of services simply at the click of a button, or even automatically. The diversity of the different embedded sensors (accelerometer, light sensors, etc.) lay the required foundation for the emergence of specialized applications that are capable of serving all kinds of purposes. By taking advantage of this specialized hardware found in smart phones, not only it has become feasible to constantly sense and gather information from the device's environment, but it has also become an effortless task to transmit the collected data to any individual or organization in a plethora of forms. This paper serves as an evaluation method for a location based Android application, SeniorTracker, by presenting a comparison between two applications that are both used for tracking down a device. While both have quite a similar purpose, the way they go about it as well as the ways the application itself can be utilized, drastically differs. SeniorTracker's main purpose lies in the retrieval of the coordinates of a device in case it is located somewhere it is not expected to be, allowing monitoring of persons that potentially will be lost, otherwise. The comparison was mainly focused on the performance of both applications when it comes to location retrieval and energy consumption while keeping in mind the respective tasks that each of them were designed to fulfill.

关键词： Smart phones Global Positioning System Intelligent sensors Ambient assisted living Accelerometers Software

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Representing externally positive systems through minimal eventually positive realizations

Representing externally positive systems through minimal eve...

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IEEE Annual Conference on Decision and control

作者： Claudio Altafini Division of Automatic Control Dept. of Electrical Engineering Linkoping University SE-58183 Sweden

ISBN: (纸本)9781479978878

In order to investigate the cases in which an externally positive discrete-time system fails to have a minimal positive realization, in this paper we introduce the notion of minimal eventually positive realization, for which the state update matrix becomes positive after a certain power. This property captures the idea that in the impulse response of an externally positive system the state of a minimal realization may fail to be positive, but only transiently. It is shown in the paper that whenever a minimal eventually positive realization exists, then the sequence of Markov parameters of the impulse response admits decimated subsequences for which minimal positive realizations exist and can be obtained by downsampling the eventually positive realization.

关键词： IMPULSE RESPONSE Positive minimal realization Minimal time system

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