• 대한전기학회:학술대회논문집
• /
• 대한전기학회 1994년도 하계학술대회 논문집 A
• /
• pp.55-56
• /
• 1994

KEPCO is now driving forward the raising of transmission-line-voltage from 345kV to 765kV for the stabilization of network and as the counter measure of the rapid-increasing of domestic electric power demands. 800kV GIS is one of the most important apparatuses in the 765kV substation and we are developing the Model $SF_6$ GCB for the GIS now. We'll explain the present condition of development of 800kV $SF_6$ GCB until now.

• 한국항공우주학회지
• /
• 제34권9호
• /
• pp.97-103
• /
• 2006

본 논문에서는 디지털 폐루프 신호처리를 이용한 광섬유자이로를 설계하고 성능 시험한 결과를 제시하였다. 회전 입력에 대한 자이로의 피드백 제어를 위해 디지털 세로다인 변조기법이 적용되었고, 환산계수의 안정화를 위해 변조진폭 및 광전력 제어회로를 설계하였다. 프로토타입 광섬유자이로를 시험한 결과, 바이어스 안정도 0.34 deg/hr, 환산계수 비선형도약 100ppm , 회전감지 영역 ${\pm}500$ deg/sec의 성능을 얻었다.

• 드라이브 ㆍ 컨트롤
• /
• 제14권3호
• /
• pp.25-31
• /
• 2017

This study presents a methodology for simulating a unified approach that controls interaction force between tool and objective by using a synthesis method of robot interacting control law for stabilizing the transient process of motion. Root locus is used to analyze stabilization of motion deviation characteristics. Based on responses of motion deviation, contact force is derived to satisfy exponential stability and we generate control input with respect to motion trajectories and interaction force. Moreover, simulation is applied to experimental application of a Cartesian robot driven by two stepper motors, and the noise of feedback signals is considered as presence of system inaccuracies, and the unified approach of interaction force control is examined precisely.

• 대한전기학회:학술대회논문집
• /
• 대한전기학회 1998년도 하계학술대회 논문집 C
• /
• pp.1153-1155
• /
• 1998

Super-conducting Magnetic Energy Storage(SMES) system is considered to be useful unit to power system stabilizer because of high efficiency and quick response. For effective operating of SMES, we need much studies on accurate modeling and interface characteristics of SMES. In this paper, we propose useful method to SMES, modeling using Artificial Neural Network. Interface technique of proposed model and criterion of stabilization effect is presented. In addition, to demonstrate the validity of proposed method. the simulations were carried out on 3-machine 9-bus system.

• 대한화장품학회:학술대회논문집
• /
• 대한화장품학회 2003년도 IFSCC Conference Proceeding Book II
• /
• pp.313-318
• /
• 2003

Vitamin C's function and mechanism are comparatively well known among the several kinds of vitamins. Inhibition of free radical. promotion of collagen synthesis, restraint of melanin formation and resolution of melanin are its main functions. But Vitamin C is very easy to oxidize by heat, moisture or air so it causes stability problem to make formulation. To solve these problems unique formulating method or derivatives using method could be effective. Object: First, stabilize 10% of Ascorbic acid as polyol/silicone emulsion and try to make polyol/silicone/polyol anhydrous multiple emulsion secondly. And then, encapsulate with porous power to enhance the stability of Ascorbic Acid from formulating method.

• JSTS:Journal of Semiconductor Technology and Science
• /
• 제13권2호
• /
• pp.114-126
• /
• 2013

In this paper, we present a set of methodologies to model the electromagnetic susceptibility (EMS) testing of I/O buffers for mobile system memory based on the bulk current injection (BCI) method. An efficient equivalent circuit model is developed for the current injection probe, line impedance stabilization network (LISN), printed circuit board (PCB), and package. The simulation results show good correlation with the measurements and thus, the work presented here will enable electromagnetic susceptibility analysis at the integrated circuit (IC) design stage.

• 한국분무공학회지
• /
• 제9권4호
• /
• pp.46-52
• /
• 2004

An LPG engine (KL6i) for heavy duty vehicle has been developed using liquid phase LPG injection (LPLi) system, which has regarded as one of next generation LPG fuel supply systems. For the KL6i engine, lean burn technology was introduced to minimize the thermal loading and NOx emissions due to an increase of the engine power. In this work, injection timing and piston bowl shape were investigated for the stabilization of lean burn characteristics. Experimental results reveals that fuel stratification induced by these parameters is most effective strategy to extend lean combustion limit in the LPLi system.

• 대한전기학회논문지
• /
• 제45권2호
• /
• pp.193-198
• /
• 1996

Low power superconducting persistent current switch(PCS) for the superconducting magnet systems in the persistent mode was developed and its experimental results were analyzed when the system was charged or discharged. The multifilament NbTi wire with Cu matrix was used for the PCS. The constructed NbTi superconducting switch with superconducting magnet system operated successfully. It also operated on-off switching action with good stabilization. The maximum operating current in persistent mode was 60A (at 1T). In persistent current mode, the decay of the persistent current at 60A was observed. Its decay was 3.55% in 60 min. It is possible to make the persistent current switch with the better decaying of persistent current if some problems for joint resistance are solved.

• 한국통신학회논문지
• /
• 제25권6B호
• /
• pp.1114-1119
• /
• 2000

In this paper, a current comparative frequency automatic tuning circuit for the CMOS bandpass filter are designed with the new architecture. And also, when the designed circuit is compared the typical tuning circuit, it has very simple architecture that is composed of the current comparator and charge pump and operated in 2V power supply. The proposed tuning circuit automatically compensate the difference between the operating current of the integrator and the reference current which is specified. Using CMOS 0.25um parameter, a CMOS bandpass active filter with center frequency(fo=100MHz) is designed, and according to the transister size the variation of the center frequency is simulated. As the HSPICE simulation results, the tuning operating of the proposed current comparative frequency automatic tuning circuit is verified.

• 대한전기학회:학술대회논문집
• /
• 대한전기학회 2006년도 제37회 하계학술대회 논문집 C
• /
• pp.1709-1710
• /
• 2006

풍력발전은 친환경적인 에너지를 사용함에도 불구하고 그 에너지의 불안정성 때문에 실용화가 어렵다. 이를 극복하기 위해 효과적인 에너지 보상시스템이 필요하다. 본 논문에서는 유도기를 모티브로 해서 플라이휠을 등가 모델링 한다. 그 후 PSIM을 이용하여 풍력발전기의 지락사고를 설정하고, 플라이휠의 보상 유무에 따른 부하의 과도현상을 살펴 보고자한다. 시뮬레이션 결과로부터 안정된 전력보상시스템의 구현할 수 있었지만, 한편으로는 고조파의 영향이 관찰되었다.