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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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The Transactions of the Korean Institute of Electrical Engineers P
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The Korean Institute of Electrical Engineers
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Volume & Issues
Volume 62, Issue 4 - Dec 2013
Volume 62, Issue 3 - Sep 2013
Volume 62, Issue 2 - Jun 2013
Volume 62, Issue 1 - Mar 2013
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The output characteristics of the input waveform to the PZT bimorph vibrator
Kim, Yong-Hyuk ; Chu, Soon-Nam ;
The Transactions of the Korean Institute of Electrical Engineers P, volume 62, issue 1, 2013, Pages 1~5
DOI : 10.5370/KIEEP.2013.62.1.001
The aim of this study is to research maximum harvesting energy by the optimal input wave condition. The voltage characteristics of the PZT bimorph were investigated in terms of the sine wave, triangle wave and square wave according to frequency range 0~70Hz. It was found that the square wave compared with a triangular wave or square wave was showed the higher output energy. PZT bimorph was mechanically vibrated by solenoid coil experiments, which revealed two voltage peak mode according to frequency. Maximum voltage at second vibration frequency 28Hz demonstrated that the generated DC voltage was proportional to the tip displacement of the bimorph and the phase difference between the input frequency and bimorph vibration frequency was 90 degree. It was expected that optimized design to harvest a much higher energy level from lower frequency vibrations.
Thermal Fluid Flow Analysis for Temperature Characterization of Mold Transformer in Distribution Power System
Kim, Ji-Ho ; Lee, Jeong-Gun ; Lee, Ki-Sik ; Rhee, Wook ; Lee, Hyang-Beom ;
The Transactions of the Korean Institute of Electrical Engineers P, volume 62, issue 1, 2013, Pages 6~11
DOI : 10.5370/KIEEP.2013.62.1.006
In this paper, the temperature characteristics of mold transformer for the distribution power system have been analyzed by using computational fluid dynamics(CFD). The model has been modeled by coil, cores, insulating materials and frames about 3MVA grade mold transformer and analyzed the temperature distribution of the structure with a heat fluid. The fluid, which is incompressible ideal gas, is analyzed as a turbulent flow phenomenon on the assumption that it is natural cooling of transformer cooling system. Through this study, by examining the temperature distribution and hot-spot of the structure field of the mold transformer, cooling design and temperature distribution information, which are demanded for designing are estimated.
Advanced DC Offset Removal Filter of High-order Configuration
Park, Chul-Won ;
The Transactions of the Korean Institute of Electrical Engineers P, volume 62, issue 1, 2013, Pages 12~17
DOI : 10.5370/KIEEP.2013.62.1.012
Fault currents are expressed as a combination of harmonic components and exponentially decaying DC offset components, during the occurrence of fault in power system. The DC offset components are included, when the voltage phase angle of fault inception is closer to
. The digital protection relay should be detected quickly and accurately during the faults, despite of the distortions of relaying signal by these components. It is very important to implement the robust protection algorithm, that is not affected by DC offset and harmonic components, because most relaying algorithms extract the fundamental frequency component from distorted relaying signal. So, In order to high performance in relaying, advanced DC offset removal filter is required. In this paper, a new DC offset removal filter, which is no need to preset a time constant of power system and accurately estimate the DC offset components with one cycle of data, is proposed, and compared with the other filter. In order to verify performance of the filter, we used collecting the current signals after synchronous machine modeling by ATPDraw5.7p4 software. The results of simulation, the proposed DC offset removal filter do not need any prior information, the phase delay and gain error were not occurred.
Electron Energy Distribution function in CH
Kim, Sang-Nam ;
The Transactions of the Korean Institute of Electrical Engineers P, volume 62, issue 1, 2013, Pages 18~22
DOI : 10.5370/KIEEP.2013.62.1.018
This paper describes the information for quantitative simulation of weakly ionized plasma. We must grasp the meaning of the plasma state condition to utilize engineering application and to understand materials of plasma state. Using quantitative simulations of weakly ionized plasma, we can analyze gas characteristic. In this paper, the electron transport characteristic in
has been analysed over the E/N range 0.1~300[Td], at the 300[
] by the two term approximation Boltzmann equation method and Monte Carlo Simulation. Boltzmann equation method has also been used to predict swarm parameter using the same cross sections as input. The behavior of electron has been calculated to give swarm parameter for the electron energy distribution function has been analysed in
at E/N=10, 100 for a case of the equilibrium region in the mean energy. A set of electron collision cross section has been assembled and used in Monte Carlo simulation to predict values of swarm parameters. The result of Boltzmann equation and Monte Carlo Simulation has been compared with experimental data by Ohmori, Lucas and Carter. The swarm parameter from the swarm study are expected to sever as a critical test of current theories of low energy scattering by atoms and molecules.
A Protocol Analysis Platform for the WTB Redundancy in Train Communication Network(TCN)
Choi, Seok-In ; Shon, Jin-Geun ;
The Transactions of the Korean Institute of Electrical Engineers P, volume 62, issue 1, 2013, Pages 23~29
DOI : 10.5370/KIEEP.2013.62.1.023
TCN(train communication network) standard was approved in 1999 by the IEC (IEC 61375-1) and IEEE (IEEE 1473-T) organizations to warrant a reliable train and equipment interoperability. TCN defines the set of communication vehicle buses and train buses. The MVB(multifunction vehicle bus) defines the data communication interface of equipment located in a vehicle and the WTB(wire train bus) defines the data communication interface between vehicles. The WTB and each MVB will be connected over a node acting as gateway. Also, to support applications demanding a high reliability, the standard defines a redundancy scheme in which the bus may be double-line and redundant-node implemented. In this paper we have presented protocol analysis platform for the WTB redundancy which is part of TCN system, to verify communication state of high-speed trains. As a confirmation of its validity, the technology described in this paper has been successfully applied to state monitoring and protocol verification of redundancy WTB based on TCN.
Analysis on Software Static Testing Results of Railway Signaling System
Hwang, Jong-Gyu ; Jo, Hyun-Jeong ; Jeong, Rak-Gyo ;
The Transactions of the Korean Institute of Electrical Engineers P, volume 62, issue 1, 2013, Pages 30~35
DOI : 10.5370/KIEEP.2013.62.1.030
Many function of railway signalling system which is in charge of most core function in a railway system are being operated by the software according to the development of computer technology. Accordingly, the source code testing to verify the safety of the railway signalling system software becomes to be more important, and related international standards highly recommend verifications on the source code also. For this reason, several related studies on vital source code verification were executed from several years ago in Korea. This paper performed tests through the application to railway signalling system being applied to the existing actual domestic railway sites through automated testing tools for coding rules of signalling system software and another signaling system software under development in Korea recently, and analyzed their results.
The Development of Boiler Fuel Control Algorithm and Distributed Control System for Coal-Fired Power Plant
Lim, Gun-Pyo ; Lee, Heung-Ho ;
The Transactions of the Korean Institute of Electrical Engineers P, volume 62, issue 1, 2013, Pages 36~44
DOI : 10.5370/KIEEP.2013.62.1.036
This paper is written for the development and application of boiler fuel control algorithm and distributed control system of coal-fired power plant by the steps of design, coding, simulation test, site installation and site commissioning test. Fuel control algorithm has the upper algorithm and it is boiler master control algorithm that controls the fuel, feed water, air by generation output demand. Generation output demand by power load influences fuel control. Because fuel can not be supplied fast to the furnace of boiler, fuel control algorithm was designed adequately to control the steam temperature and to prevent the explosion of boiler. This control algorithms were coded to the control programs of distributed control systems which were developed domestically for the first time. Simulator for coal-fired power plant was used in the test step. After all of distributed control systems were connected to the simulator, the tests of the actual power plant were performed successfully. The reliability was obtained enough to be installed at the actual power plant and all of distributed control systems had been installed at power plant and all signals were connected mutually. Tests for reliability and safety of plant operation were completed successfully and power plant is being operated commercially. It is expected that the project result will contribute to the safe operation of domestic new and retrofit power plants, the self-reliance of coal-fired power plant control technique and overseas business for power plant.
High Frequency Circuit Design using Feedback Control with Body Load Fluctuation for Pain Relief Therapy
Park, Chul-Won ; Won, Chul-Hee ;
The Transactions of the Korean Institute of Electrical Engineers P, volume 62, issue 1, 2013, Pages 45~49
DOI : 10.5370/KIEEP.2013.62.1.045
High frequency system has been used for the purpose of skin care and obesity treatment, by high-frequency energy is applied to the human body generates deep heat. Conventional high frequency system could not selection control by depending on the body load fluctuations. Such as burns and side effects have been reported by system instability and then therapeutic effect is insufficient. During treatment, objective information about the status of the patient was no. Because of treatment methods are subjective, and so tailored treatments were impossible. In this paper, high frequency medical system with sinusoidal frequency characteristics without distortion of the Push pull switching scheme for pain relief therapy was designed. And control circuit that was designed by feedback using the output changes according to the body-load fluctuation. Last, power circuit for efficient control the heat generated from the hardware was proposed.
A Study on the Variation of Physiology Signals based on EEG with Humidity
Kim, Myung-Ho ; Kim, Jung-Min ;
The Transactions of the Korean Institute of Electrical Engineers P, volume 62, issue 1, 2013, Pages 50~55
DOI : 10.5370/KIEEP.2013.62.1.050
Subjects with 0.7[clo]'s amount of clothing were estimated on their thermal comfort, concentrativeness, heart rate variability, stress and fatigue degree when given variation in relative humidity to 30, 40, 50, 60, 70, and 80[RH%], in an environmental test room of temperature 25[
], illumination 1000[lux] and air velocity 0.02[m/sec], by using EEG, learning ability and HRV. At the result, it was at 50~60[RH%] of relative humidity that subject's thermal comfort and concentrativeness were at the highest while stress were at the lowest, and it was at 60[RH%] of relative humidity that heart rate variability was most stabilized. It was found that when temperature and humidity of the environmental test room are at 25[
] and 50~60[RH%], subject's productivity and psychological state are least affected.