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Aproximadamente 30 registro(s) hasta el momento: (journal)

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Recurso libre

Fiber Optical Sensor for High Temperatures
Hanacek, Frantisek; Site Administrator - Latal, Jan - Koudelka, Petr - Skapa, Jan - Siska, Petr - Vasinek, Vladimir - Hurta, Jan

Formato:	,
Enlaces:	The fiber optic sensors are used in various industries. Advantages of optical sensors are based on the benefits of fiber and partially profit at their technological advances. The fiber optic temperature sensors are based on more than one way of…
Fecha:	2010-03-31
Recurso:	Advances in Electrical and Electronic Engineering

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Influence of Magnetic Field on Electric Charge Trasport in Holmium Thin Film at Low Temperature
Dudas, Jan - Gabani, Stanislav - Bagi, Jozef - Goscianska, Iwona - Hodulikova, Anna

Formato:	,
Enlaces:	High precision electrical resistance measurements were performed in the low temperature range from 4.2 K up to room temperature on a holmium bulk sample, and on holmium thin films in magnetic field. The X-ray diffraction of Ho films confirmed their preferential crystal…
Fecha:	2010-03-31
Recurso:	Advances in Electrical and Electronic Engineering

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Binary Modulation Formats in Optical Access Networks
Tejkal, Vladimir - Filka, Miloslav - Reichert, Pavel - Sporik, Jan

Formato:	,
Enlaces:	In this paper the binary modulation formats and their application in passive optical networks have been discussed. Passive optical networks are characterized by dividing the optical signal between several end users by using passive splitters, which added a significant attenuation…
Fecha:	2010-12-31
Recurso:	Advances in Electrical and Electronic Engineering

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Removal of a Degraded Concrete Layer with Emphasis on the Surface Optimization Before Application of Repair Material
Janurova, Eva - Pustelnik, Jan - Hlavac, Libor

Formato:	,
Enlaces:	This contribution is concerned with the modelling of destructive effects of a high-velocity water jet, used as a tool for preparation of surfaces during reconstructions, on a degraded layer of concrete. The destruction action of a water jet on model material…
Fecha:	2012-03-31
Recurso:	Advances in Electrical and Electronic Engineering

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Security Risks in IP Telephony
Rezac, Filip; Proofreader - Voznak, Miroslav

Formato:	,
Enlaces:	This paper deals with VoIP communication security and various techniques of VoIP attacks. We divided these threats in several categories according to their specific behaviour and their impact on the affected system. We also tried to find effective methods to…
Fecha:	2010-03-31
Recurso:	Advances in Electrical and Electronic Engineering

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Delay Variation Model with Two Service Queues
Rezac, Filip; Proofreader - Voznak, Miroslav - Hromek, Frantisek

Formato:	,
Enlaces:	Delay in VoIP technology is very unpleasant issue and therefore a voice packets prioritization must be ensured. To maintain the high call quality a maximum information delivery time from the sender to the recipient is set to 150 ms. This…
Fecha:	2010-03-31
Recurso:	Advances in Electrical and Electronic Engineering

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Current Condition in the Transport Telematics
Mikulski, Jerzy; Silesian University of Technology, Katowice - Kedziora, Kacper

Formato:	,
Enlaces:	The term “telematics”, which originated more than ten years ago, stands for integration of technologies and solutions from the field of telecommunication, automation and computer science. Telematics is the combination of words “tele” (transfer at some distance, remote access) and…
Fecha:	2010-12-31
Recurso:	Advances in Electrical and Electronic Engineering

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Introduction to Feedforward Control of Electric Drives - Rules and Limits
Malek, Michal - Makys, Pavol - Stulrajter, Marek

Formato:	,
Enlaces:	Electric servodrives are characterized by precise tracking and its derivations. The way to meet this goal cost them a number of obstacles, whether variations associated with end-stage of astatism, changes in the positioning system parameters or to changes in load…
Fecha:	2010-12-31
Recurso:	Advances in Electrical and Electronic Engineering

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Short-Term Load Forecast in Electric Energy System in Bulgaria
Asenova, Irina - Georgiev, Dimitar

Formato:	,
Enlaces:	As the accuracy of the electricity load forecast is crucial in providing better cost effective risk management plans, this paper proposes a Short Term Electricity Load Forecast (STLF) model with high forecasting accuracy. Two kind of neural networks, Multilayer Perceptron…
Fecha:	2010-12-31
Recurso:	Advances in Electrical and Electronic Engineering

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10.

Sampling of Random Data Streams
Cepciansky, Gustav - Schwartz, Ladislav

Formato:	,
Enlaces:	Modern telecommunication networks work on the transmission method of common data streams in which data bursts consisting of packets that further consist of particular bits are multiplexed from various traffic sources. The larger amount of data is transmitted through a…
Fecha:	2011-03-31
Recurso:	Advances in Electrical and Electronic Engineering

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11.

Erlang C Formula and its Use in the Call Centers
Chromy, Erik; Slovak University of Technology - Misuth, Tibor - Kavacky, Matej

Formato:	,
Enlaces:	This paper deals with calculation of important parameters of the Call Center using the Erlang C formula and then results are verified through simulations. Erlang C formula is defined as a function of two variables: the number of agents N…
Fecha:	2011-03-31
Recurso:	Advances in Electrical and Electronic Engineering

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12.

Far-end Crosstalk Modeling Based on Capacitive and Inductive Unbalances Between Pairs in a Cable
Lafata, Pavel

Formato:	,
Enlaces:	This article deals with new ways of far-end crosstalk (FEXT) modeling in multi-pair and multi-quad metallic cables. Current standard modeling methods provide only rough estimations of FEXT characteristics based on average values of crosstalk for the whole cable. However, for…
Fecha:	2011-03-31
Recurso:	Advances in Electrical and Electronic Engineering

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13.

Time Delay Estimation Algoritms for Echo Cancellation
Sakhnov, Kirill - Verteletskaya, Ekaterina - Simak, Boris

Formato:	,
Enlaces:	The following case study describes how to eliminate echo in a VoIP network using delay estimation algorithms. It is known that echo with long transmission delays becomes more noticeable to users. Thus, time delay estimation, as a part of echo…
Fecha:	2011-03-31
Recurso:	Advances in Electrical and Electronic Engineering

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14.

Harmonic Orientation of Pulse Width Modulation Technique in Multilevel Inverters
Bandaru, Urmila - Rayudu, Subba D

Formato:	,
Enlaces:	The Multilevel Inverter topology gives the advantages of usage in high power and high voltage application with reduced harmonic distortion without a transformer. This paper presents a comparative study of orientation of higher ordered harmonics with increase in switching frequency…
Fecha:	2011-03-31
Recurso:	Advances in Electrical and Electronic Engineering

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15.

Feedforward Control of Electrical Drives - Rules and Limits
Malek, Michal - Makys, Pavol - Stulrajter, Marek

Formato:	,
Enlaces:	Nowadays, there are several application in the field of position controlled electric drives, such as high speed cutting, where traditional cascade control structures provide insufficient accuracy. Therefore, it is necessary either to completely change the control structure (e.g. sliding mode…
Fecha:	2011-03-31
Recurso:	Advances in Electrical and Electronic Engineering

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16.

An Elimination of Resonance in Electric Drives
Malek, Michal - Makys, Pavol - Stulrajter, Marek

Formato:	,
Enlaces:	Flexible couplings together with resonance phenomenon are present mainly in the field of servodrives where high accuracy and dynamic requirements are crucial. When dynamics doesn’t correlate with mechanical system design, unwanted frequencies in the system are exited. Sometimes we haven’t…
Fecha:	2011-03-31
Recurso:	Advances in Electrical and Electronic Engineering

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17.

Novel Wien Bridge Oscillator Design Using Functional Block Structure with Current Conveyors
Brandstetter, Pavel; VSB-Technical University of Ostrava - Klein, Lukas; VSB-Technical University of Ostrava

Formato:	,
Enlaces:	The purpose of this paper is to generally present possibilities of the current conveyor use in the well-known active electronic circuits. Current conveyors are able to substitute all known active elements. This claim is supported by the fact, that four…
Fecha:	2012-03-31
Recurso:	Advances in Electrical and Electronic Engineering

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18.

Electric Vehicle Control Units Communication
Slivka, David - Palacky, Petr - Vaculik, Petr - Havel, Ales

Formato:	,
Enlaces:	Article handles with control units cooperation, which is usable in drive control application especially in electric vehicle. Control unit with Freescale Digital Signal Controller 56F8037 is used as main subject of this research. CAN bus has been selected for control…
Fecha:	2012-03-31
Recurso:	Advances in Electrical and Electronic Engineering

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19.

Detector of Covered Conductor Faults
Hamacek, Stefan; Department of Electrical Engineering, FEI, VSB – Technical Univerzity of Ostrava - Misak, Stanislav; Department of Electrical Engineering, FEI, VSB – Technical Univerzity of Ostrava

Formato:	,
Enlaces:	In the Czech Republic are bare conductor lines replaced by cover conductor lines. The cover conductor lines have many advantages. Advantages and disadvantages of PAS system are described in this paper. This article describes issue of fault detection for lines…
Fecha:	2012-03-31
Recurso:	Advances in Electrical and Electronic Engineering

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20.

On PID Controller Design Using Knowledge Based Fuzzy System
Nowakova, Jana; VSB-Technical University of Ostrava - Pokorny, Miroslav; VSB-Technical University of Ostrava

Formato:	,
Enlaces:	The designing of PID controllers is a frequently discussed problem. Many of design methods have been developed, classic (analytical tuning methods, optimization methods etc.) or not so common fuzzy knowledge based methods which are designed to achieve good setpoint following,…
Fecha:	2012-03-31
Recurso:	Advances in Electrical and Electronic Engineering

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21.

Medical Image Denoising by Improved Kuan Filter
Benes, Radek - Riha, Kamil

Formato:	,
Enlaces:	This paper focuses on the issue of speckle noise and its suppression. Firstly, the multiplicative speckle noise model and its mathematical formulation are introduced. Then, certain de-noising methods are described together with possible improvements. On their basis, an improvement of…
Fecha:	2012-03-31
Recurso:	Advances in Electrical and Electronic Engineering

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22.

Fuzzy Methods and Image Fusion in a Digital Image Processing
Vlach, Jaroslav - Kolar, Milan

Formato:	,
Enlaces:	Although the basics of image processing were laid more than 50 years ago, significant development occurred mainly in the last 25 years with the entrance of personal computers and today's problems are already very sophisticated and quick. This article is…
Fecha:	2012-03-31
Recurso:	Advances in Electrical and Electronic Engineering

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23.

An Efficient TFETI Based Solver for Elasto-Plastic Problems of Mechanics
Cermak, Martin - Kozubek, Tomas

Formato:	,
Enlaces:	This paper illustrates how to implement effectively solvers for elasto-plastic problems. We consider the time step problems formulated by nonlinear variational equations in terms of displacements. To treat nonlinearity and nonsmoothnes we use semismooth Newton method. In each Newton iteration…
Fecha:	2012-03-31
Recurso:	Advances in Electrical and Electronic Engineering

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24.

The Study of Sensory Properties of Quasi-Singlemode Fiber
Koudelka, Petr; Department of Telecommunications Faculty of Electrical Engineering and Computer Science VSB-TU Ostrava 17. listopadu 15/2172 708 33 Ostrava-Poruba Czech Republic - Latal, Jan - Siska, Petr - Hanacek, Frantisek - Skapa, Jan - Vasinek, Vladimir

Formato:	,
Enlaces:	The quasi-singlemode fibers are optical fibers with unique properties, the atypical profile structure allows the simultaneous use of optical fiber as transmission media and sensors, based on the distribution of optical power among several modes. In collaboration with the ASČR…
Fecha:	2010-03-31
Recurso:	Advances in Electrical and Electronic Engineering

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25.

Optical Fiber Sensor with Distributed Parameters Based on Optical Fiber Reflectometry
Korenko, Branislav - Jasenek, Jozef - Cervenova, Jozefa - Hlavac, Marek

Formato:	,
Enlaces:	His paper deals with the two-stage two-phase electronic systems with orthogonal output voltages and currents - DC/AC/AC. Design of two-stage DC/AC/AC high frequency converter with two-phase orthogonal output using single-phase matrix converter is also introduced. Output voltages of them are…
Fecha:	2011-03-31
Recurso:	Advances in Electrical and Electronic Engineering

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26.

Sampling Rate Conversion
Vitasek, Jan; Layout Editor

Formato:	,
Enlaces:	The topic of this article is conversion of the signal with given sampling frequency to signal with another sampling rate. The task is to change the sampling rate from fvz3=500Hz to fvz4=360Hz. There are two methods; in the text are called…
Fecha:	2010-03-31
Recurso:	Advances in Electrical and Electronic Engineering

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27.

Design, Modelling and Simulation of Two-Phase Two-Stage Electronic System with Orthogonal Output for Supplying of Two-Phase ASM
Prazenica, Michal - Dobrucky, Branislav - Sekerak, Peter - Kalamen, Lukas

Formato:	,
Enlaces:	This paper deals with the two-stage two-phase electronic systems with orthogonal output voltages and currents - DC/AC/AC. Design of two-stage DC/AC/AC high frequency converter with two-phase orthogonal output using single-phase matrix converter is also introduced. Output voltages of them are…
Fecha:	2011-03-31
Recurso:	Advances in Electrical and Electronic Engineering

Recurso libre

28.

Evaluation of cooperation WPP and PV connected through the shared transformer to the network 22kV
Sumbera, Tomas; VŠB-TU Ostrava, FEI, Katedra elektroenergetiky - Strida, Frantisek; Department of Electrical Engineering, FEI, VSB – Technical Univerzity of Ostrava - Hradilek, Zdenek; Department of Electrical Engineering, FEI, VSB – Technical Univerzity of Ostrava - Rusek, Stanislav; Department of Electrical Engineering, FEI, VSB – Technical Univerzity of Ostrava

Formato:	,
Enlaces:	The article deals with evaluation the cooperation possibility of wind and solar power plants connected through the common transformator to the 22kV network. Cooperation evaluation is, based on measured data, for wind power plant about installed capacity 2MW and for…
Fecha:	2012-03-31
Recurso:	Advances in Electrical and Electronic Engineering

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29.

Generating Parallel Applications from Models Based on Petri Nets
Bohm, Stanislav; Faculty of Electrical Engineering and Computer Science, VSB - Technical University of Ostrava - Behalek, Marek; Faculty of Electrical Engineering and Computer Science, VSB - Technical University of Ostrava

Formato:	,
Enlaces:	Parallel and distributed systems play an important role in the development of information technologies and their applications today. These systems are very useful but their development and usage is inherently more difficult. A solution can be a tool focused on…
Fecha:	2012-03-31
Recurso:	Advances in Electrical and Electronic Engineering

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30.

Automated Region of Interest Retrieval of Metallographic Images for Quality Classification in Industry
Kotas, Petr; Department of Applied Mathematics (K 470) Faculty of Electrical Engineering and Computer Science (FEI) VSB-Technical University of Ostrava Tr. 17. listopadu 15 CZ 708 33 Ostrava-Poruba Czech Republic - Praks, Pavel; Department of Applied Mathematics (K 470) Faculty of Electrical Engineering and Computer Science (FEI) VSB-Technical University of Ostrava Tr. 17. listopadu 15 CZ 708 33 Ostrava-Poruba Czech Republic - Valek, Ladislav; Research – Production Technology, ArcelorMittal Ostrava plc, Ostrava, Czech Republic - Zejkovic, Vesna; New York Institute of Technology, School of Engineering & Computing Sciences, Nanjing campus, China - Vondrak, Vit; Department of Applied Mathematics (K 470) Faculty of Electrical Engineering and Computer Science (FEI) VSB-Technical University of Ostrava Tr. 17. listopadu 15 CZ 708 33 Ostrava-Poruba Czech Republic

Formato:	,
Enlaces:	The aim of the research is development and testing of new methods to classify the quality of metallographic samples of steels with high added value (for example grades X70 according API). In this paper, we address the development of methods…
Fecha:	2012-03-31
Recurso:	Advances in Electrical and Electronic Engineering