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27th Spring Conference on computer Graphics, SCCG 2011

作者： Carata, Lucian Shao, Dan Hadwiger, Markus Groeller, Eduard Faculty of Automatic Control and Computer Engineering Gh. Asachi Technical University of Iasi Romania Institute of Computer Graphics and Algorithms Vienna University of Technology Austria Division of Mathematical and Computer Sciences and Engineering King Abdullah University of Science and Technology Saudi Arabia

ISBN: (纸本)9781450319782

Technical developments in neurobiology have reached a point where the acquisition of high resolution images representing individual neurons and synapses becomes possible. For this, the brain tissue samples are sliced using a diamond knife and imaged with electron-microscopy (EM). However, the technique achieves a low resolution in the cutting direction, due to limitations of the mechanical process, making a direct visualization of a dataset difficult. We aim to increase the depth resolution of the volume by adding new image slices interpolated from the existing ones, without requiring modifications to the EM image-capturing method. As classical interpolation methods do not provide satisfactory results on this type of data, the current paper proposes a re-framing of the problem in terms of motion volumes, considering the depth axis as a temporal axis. An optical flow method is adapted to estimate the motion vectors of pixels in the EM images, and this information is used to compute and insert multiple new images at certain depths in the volume. We evaluate the visualization results in comparison with interpolation methods currently used on EM data, transforming the highly anisotropic original dataset into a dataset with a larger depth resolution. The interpolation based on optical flow better reveals neurite structures with realistic undistorted shapes, and helps to easier map neuronal connections. © 2011 ACM.

关键词： Interpolation

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Implementation of an inexpensive EEG headset for the pattern recognition purpose

Implementation of an inexpensive EEG headset for the pattern...

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2013 IEEE 7th International Conference on Intelligent Data Acquisition and Advanced Computing Systems, IDAACS 2013

作者： Kawala-Janik, Aleksandra Podpora, Michal Pelc, Mariusz Piatek, Pawel Baranowski, Jerzy University of Greenwich School of Computing and Mathematical Sciences London United Kingdom Opole University of Technology Faculty of Electrical Engineering Automatic Control and Informaics Opole Poland AGH University of Science and Technology Faculty of Electrical Engineering Automatics Computer Science and Biomedical Engineering Krakow Poland

ISBN: (纸本)9781479914265

There are many types of bio-signals with various control application prospects. In this work possible control application domain of electroencephalographic signal obtained from an easily available, inexpensive EEG headset - Emotiv EPOC was presented. This work also involved application of an embedded system platform. That solution caused limits in choosing an appropriate signal processing method, as embedded platforms characterise with a little efficiency and low computing power. Potential implementation of the embedded platform enables to extend the possible future application of the proposed BCI. It also gives more flexibility, as the platform is able to simulate various environments. In this work traditional, statistical methods were neither used nor described. © 2013 IEEE.

关键词： Brain computer interface

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Analysis of low-frequency acoustic signals emitted by low-power vertical axis wind turbine VAWT

Analysis of low-frequency acoustic signals emitted by low-po...

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International Conference on Environment and Electrical engineering

作者： Radoslaw Pierzga Tomasz Boczar Faculty of Electrical Engineering Automatic Control and Computer Science Opole University of Technology

ISBN: (纸本)9781467330602

Operating wind turbines produce infrasound noise thus they act on the environment. This also applies to small wind turbines, which are located in the immediate vicinity of human settlements. Small wind turbines can be located close to buildings and mounted directly on their walls and roofs. In this case, it is important to determine the level of environmental impact of such type of installation. Measurement results of infrasound noise generated by a small vertical axis wind turbine (VAWT), rated power 1 kW, are presented in the paper. Analysis results of sound pressure level and dependence of signal spectra from different wind speeds are shown. In the analysis of sound pressure level the G weighing curve was used according to the ISO 7196:2002 standard and achieved results were referred to the limits contained in the current legislation, what allowed for evaluation of the infrasound noise impact of the turbine under study.

关键词： Infrasound emission Small wind turbine VAWT

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Analysis of infrasound noise emitted by high power wind turbine with asynchronous generator for selected resonant and median frequencies

Analysis of infrasound noise emitted by high power wind turb...

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International Conference on Environment and Electrical engineering

作者： Tomasz Malec Tomasz Boczar Faculty of Electrical Engineering Automatic Control and Computer Science Opole University of Technology

ISBN: (纸本)9781467330602

The paper presents analysis results of sound pressure level of infrasound noise generated by brand new wind turbine from REPOWER type MM92, rated power 2 MW. As results the amplitude spectra of noise for three chosen wind speed values are presented. Additionally, distributions of the sound pressure level with dependence on wind speed for selected resonant and median frequency values are presented. For chosen frequencies linear regression analysis was performed and subjected for a detailed evaluation. Values obtained from measurement were referred to and compared with the limits specified in legislations existing in this area.

关键词： Component Wind turbine Infrasound noise Synchronous generator

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Analysis of infrasound noise emitted by high-power wind turbine with synchronous generator

Analysis of infrasound noise emitted by high-power wind turb...

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International Conference on Environment and Electrical engineering

作者： Tomasz Malec Tomasz Boczar Faculty of Electrical Engineering Automatic Control and Computer Science Opole University of Technology

ISBN: (纸本)9781467330602

Analysis results of sound pressure level of infrasound noise generated by high-power wind turbine Vensys type 62, which is operated for five years with an electrical capacity of 1.2 MW, are presented in the paper. Frequency and time-frequency spectrograms calculated for recorded low-frequency signals with respect to all registered changes of electrical power generated and the number of rotor revolutions per minute are presented. All measured sound pressure levels have been evaluated with and without the use of G weighting curve, which have helped to determine the size of infrasound impact of turbines and to analyze the influence of regarded parameters on this impact range of changes. Values obtained from measurement were referred to and compared with the limits specified in legislations existing in this area.

关键词： Component: wind turbine Infrasound noise Synchronous generator

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Efficient fractal method for texture classification

Efficient fractal method for texture classification

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2013 2nd International Conference on Systems and computer Science, ICSCS 2013

作者： Popescu, Andreea Lavinia Popescu, Dan Ionescu, Radu Tudor Angelescu, Nicoleta Cojocaru, Romeo Faculty of Automatic Control and Computer Science Politehnica University of Bucharest 313 Splaiul Independentei Street Bucharest Romania Faculty of Mathematics and Computer Science University of Bucharest 14 Academiei Street Bucharest Romania Faculty of Electrical Engineering Valahia University of Targoviste 2 Carol I Blvd Targoviste Romania

ISBN: (纸本)9781479920204

This paper presents an alternative approach to classical box counting algorithm for fractal dimension estimation. Irrelevant data are eliminated from input sequences of the algorithm and a new fractal dimension, called efficient fractal dimension (EFD), which is based on the remaining sequences is calculated. The discriminating capacity and the time efficiency of EFD are evaluated in comparison with fractal dimension (FD) computed by box counting both theoretically and empirically. The results revealed that EFD is better than FD for texture identification and classification. © 2013 IEEE.

关键词： Fractal dimension

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Structured coprime factorizations description of linear and time-invariant networks

Structured coprime factorizations description of linear and ...

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52nd IEEE Conference on Decision and control, CDC 2013

作者： SabǍu, Şerban OarǍ, Cristian Warnick, Sean Jadbabaie, Ali Electrical and Computer Engineering Dept. Stevens Institute of Technology United States Faculty of Automatic Control Dept. University Politehnica Bucharest Romania Faculty of Computer Science Department Information and Decision Algorithms Laboratories Brigham Young University United States Faculty of Electrical and Systems Engineering Dept. University of Pennsylvannia United States

ISBN: (纸本)9781467357173

In this paper we study state-space realizations of Linear and Time-Invariant (LTI) systems. Motivated by biochemical reaction networks, Gonçalves and Warnick have recently introduced the notion of a Dynamical Structure Functions (DSF), a particular factorization of the system's transfer function matrix that elucidates the interconnection structure in dependencies between manifest variables. We build onto this work by showing an intrinsic connection between a DSF and certain sparse left coprime factorizations. By establishing this link, we provide an interesting systems theoretic interpretation of sparsity patterns of coprime factors. In particular we show how the sparsity of these coprime factors allows for a given LTI system to be implemented as a network of LTI sub-systems. We examine possible applications in distributed control such as the design of a LTI controller that can be implemented over a network with a pre-specified topology. ©2013 IEEE.

关键词： Factorization

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Modern solutions for protecting the power system transformers of the transmission networks

UPB Scientific Bulletin, Series C: Electrical Engineering

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UPB Scientific Bulletin, Series C: Electrical engineering 2013年第3期75卷 55-62页

作者： Constantin, Iulia-Cristina Constantin, Costel Iliescu, Sergiu Stelian Faculty of Automatic Control and Computer Science University Politehnica of Bucharest Romania Faculty of Power Engineering University Politehnica of Bucharest Romania

For several decades, the power system protection relay has experienced many important changes, from purely electromechanical type to the mixture of electronic and electromechanical type, then to fully static and now fully numerical relays based on microprocessors. In the transformer protection area, similar changes can be seen. This new numerical technology had been developed so much that now the protection systems integrates in the same device, besides the protection function also the control functions, this kind of systems also being called as multifunctional protection system (MPS). The paper relieve the main features of the newly developed transformer protection and control systems, the positive impact on the faults clearance times and also the development trends in this domain .

关键词： control systems

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Image vectorization on modern architectures

Image vectorization on modern architectures

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IEEE International Conference on Intelligent computer Communication and Processing

作者： Emil Slusanschi Grigore Lupescu Computer Science and Engineering Departament Faculty of Automatic Control and Computers University "Politehnica" of Bucharest

ISBN: (纸本)9781479914920

This work presents an image vectorization application aimed to exploit features found in most of today's modern architectures. Design decisions supported by performance results are presented along with use cases for the proposed solution. We will present the algorithm, the target architectures and threading models, as well as a number of optimization techniques. Finally results of both low power SoC and high performance multicore processors are discussed.

关键词： Vectorization Heterogeneous Manycore Imaging Parallelism Multicore

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Hand pose estimation using HOG features from RGB-D data

Hand pose estimation using HOG features from RGB-D data

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

作者： Constantina Raluca Mihalache Bogdan Apostol Faculty of Automatic Control and Computer Engineering Technical University “Gheorghe Asachi” Iasi Romania

Visual based recognition of hand gestures has been an active research field in recent years due to its efficiency in helping us achieve a more natural human-computer interaction. This paper presents a new approach to hand pose estimation using combined visual and geometric information obtained in a synchronized format from a RGB-D sensor. Firstly, we track the contour of the hand and recognize the fingertip positions. Then, Kernel Principal Component Analysis is used for selecting the most relevant elements from the histograms of oriented gradients feature vectors obtained on both color and depth data. We define an observation model based on the found fingertip positions and the selected principal components and we feed it as input for a Support Vector Machine classifier. Experimental results for the proposed method show that good detection percentages can be obtained with a small training dataset of real hand images and depth masks.

关键词： Feature extraction Support vector machines Training Kernel Image segmentation Vectors Principal component analysis

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