이산가변구조를 이용한 유효전력제어기 설계에 관한 연구

한운동 한국교통대학교 2014 한국교통대학교 논문집 Vol.49 No.-

In this paper, active power controller in order to solve the problems of the discrete variable structure algorithm of the conventional voltage-controlled multi-functional UPS is proposed. A discrete variable structure controller is proposed transients have fast response to disturbance was about the extent permitted by the voltage-controlled multi-function having the toughness of the UPS were shortcomings.

有限要素法에 의한 靜電界計算에 關한 硏究

韓運東 忠州大學校 1988 한국교통대학교 논문집 Vol.22 No.-

The Finite Element Method(FEM) calculation of potential electric field in the test a square of 100 x 100 [mm] is divided into series connected halves, on where the capacitive distribution dominates, and on where th resistive distribution dominates. The field region is descretized by triangular finite elements and Mathematically the potential electric phenomenon can be represented by the poisson and Laplace equations. One such funtional is used to assemble a matrix equation for the vector potential. Boundary conditions and matrix solution techniques are as well as postprocessing to obtain various potential electric parameters. The results are compared with those of classical analysis and those of experimental test.

直竝列 共振型 Converter 回路의 Modeling과 Simulation에 對한 解析

韓運東 충주대학교 1997 한국교통대학교 논문집 Vol.32 No.2

This paper presents a SPICE macromodel for a generic series-parallel resonant converter circuit. The model is derived from the averaged time-invarian state-space equations obtained from a fourier transform. The conditions are derived under which all but the fundamental harmonic may be discarded, and the model developed based solely on the fundamental Fourier componant, and the single macromodel developed has a wide range of validity,and allows DC,AC,transient analysis to be carried out ina fast,easy, and familar manne. It also permits the converter to be incorporated alongside its control circuitry into an entire system. The simulation result from the model has been compared to results from a full simulation, and the agreement is found to be excellent, with the macromodel simulationrunning between 37 and 4700 times faster than full simulation.

高電壓工學의 PSPICE 適用에 關한 硏究

韓運東 忠州大學校 1996 한국교통대학교 논문집 Vol.31 No.2

Usefulness of the SPICE, Simulation analysis program with Integrated Circuit Emphasis, circuit engineering education, where assembling the actual circuit might be very bulky, time-consuming and cosly, or hand calculation techniques could be very complicated. Two representative high voltage generating circuits are simulated. One is an impulse generator and the other is a voltage multiplier. The first circuit is analyzed for the dependence of rise time of the impulse voltage on the values of the wave front resistor, line inductance and load capacitance. A three stage impulse generator is also simulated to determine the effects of wave front and wave tail resistors on the voltage waveform. The second circuit is analyzed for the dependence of output voltage and ripple on the load resistance and output capacitance. SPICE can similarly be used for most high voltage systems in the laboratory, making use of students' time much more effective as well as limiting to minimum their exposure to very high voltage, ensuring therefore persnal safty in the laboratory.

COMPUTER에서 SWITCHIG函數를 使用한 3相 INVERTER SIMULATION에 關한 硏究

韓運東 忠州大學校 1994 한국교통대학교 논문집 Vol.29 No.2

Static power converters can be analyzed by means of widely avriable circuit simulation software packages such as PSPICE. However, they are usually modeled as a set of real switch, which results in long execution times and possible convergence problems in the case of complex circuit. This paper proposes macromodels to simulate three-phase power converter on such package. The proposed macromodels are based on converter switching functions rather than actual circuit configuration, and they are suited for steady of state and large signal transient analysis at system level. In this approach, voltage sourceinverters (VSI) are simulated as multiport network avoiding the physical nonlinear micromodels of the power switchs.

有限要素法에 依한 磁界計算에 關한 硏究

韓運東 忠州大學校 1986 한국교통대학교 논문집 Vol.20 No.1

In this study, an application of Finite Element Method which in principle based variational calculus has been presented for the two-dimensional analysis of magemethic flux. The energy functional for nonlinear magnetostatic problems and for steady state sinusoidal induction problems are presented. One such functional is used to assemble a matrix equation for the magnetic vector potential. Boundary conditions and matrix solution techniques are as well as postprocessing to obtain various electromagnetic parameters. Finally a sychronous motor analysis is presented as a typical application.

現場實測에 依한 産業用 負荷設備의 電力品質 分析

지평식,한운동 忠州大學校 2004 한국교통대학교 논문집 Vol.39 No.1

Harmonics happened due to nonlinear systems such as UPS, SCR controlled motors, and fluorescent lighting in distribute power system is very important subject to optimal operate and control of power system. Harmonics sometimes takes place incorrect operation of protective relaying system under normal condition on power system. This paper presents the actual recording data of transformer located at substation of industrial installation for harmonic analysis in detail.

Epinephrine 이 흰쥐의 血淸, 肝 및 筋肉內 Lactate Dehydrogenase에 미치는 影響

林中基,金雲將 成均館大學校 1975 論文集 Vol.20 No.-

1. A series of experiment has been conducted in the state of hyperglycemia caused by the continuously subcutaneous injection of epinephrine into previously fasted albino rats, and then the variation of LDH activities and LDH isozyme patterns in serum, liver and muscle have been studied. 2. The LDH-activity has been elevated in serum and liver above the average level for control group, but little change found in muscle. 3. The change of LDH isozyme patterns has been shown that in serum LDH_1 and LDH_5 are increased, and in liver LDH is tend to increase, while in muscle LDH_1 increased and LDH_5 decreased.

Computer에서 電力電子回路 解析技法 支援에 關한 考察

趙武濟,韓運東 忠州大學校 1995 한국교통대학교 논문집 Vol.30 No.2

This paper describes how computer simulation can assist power electronics education at the undergraduate level. Using PSPICE as an instructional tool for an introductory-level power electronics course has increased students abilities to comprehend the behavior of several power electronics circuits. The graphics5 post-processor Probe, which accompanies PSPICE, is used to display voltage and current waveforms. Probe's capability of doing numerical computations reduces the effort needed to determine power-rerated quantities in nonlinear circuits. Fourier analysis capabilities of PSPICE enable harmonics to be investigated. Examples of PSPICE simulations are included.

초음파 센서 및 음성인식 기반 자율주행로봇의 지능제어에 관한 연구

한성현,김윤구,Le Xuan Thu,신행봉,조창제 한국공작기계학회 2006 한국공작기계학회 추계학술대회논문집 Vol.2006 No.-

In this paper, it is presented a new approach to the design of intelligent control system of a autonomous robot with two drive wheel. The proposed control scheme uses a Gaussian function as a unit function in the fuzzy neural network, and back propagation algorithm to train the fuzzy neural network controller in the framework of the specialized learning architecture. It is proposed a learning controller consisting of two neural network-fuzzy based on independent reasoning and a connection net with fixed weights to simply the neural networks-fuzzy. The performance of the proposed controller is shown by performing the computer simulation for trajectory tracking of the speed and azimuth of a mobile robot driven by two independent wheels.