• Journal of the Korean Institute of Electrical and Electronic Material Engineers
• /
• v.30 no.10
• /
• pp.672-676
• /
• 2017

Electrical energy is playing an increasingly vital role as the primary energy source in everyday life. With the increase in electric power consumption, power facilities are under an increasing stress and must operate at a high capacity. Consequently, the demand for electric power cables in power transmission and distribution lines is rapidly increasing. Underground distribution lines have been steadily replacing the aboveground lines owing to the increase in electric power demand and the need to increase the supply voltage. In addition to line damage, worker safety is of primary concern in this type of underground infrastructure. In this study, to improve the safety of workers dealing with underground transmission lines, we analyzed the electromagnetic field generated around the distribution line and determined the basic criteria for developing a device that can detect a live underground line.

• Journal of Power System Engineering
• /
• v.20 no.3
• /
• pp.57-63
• /
• 2016

This paper presents the experimental result and theoretical analysis result to investigate the correlation between the operating force, angle and locking torque for vehicle hood frame. Also, we derived the experimental equation that using the results for experiment and theory. The hood frame is switching-devices used for opening and closing the vehicle hood. It needs the correlation data between locking torques of each joint, operating force and angle of hood frame. The correlation data for torque and reaction force of hood frame obtained through experiment and theory analysis. Finally, the experimental equation of the locking torque prediction for the hood frame is derived.

• Proceedings of the Korean Society of Computer Information Conference
• /
• 2017.01a
• /
• pp.241-243
• /
• 2017

이동 단말기에서 실시간 데이터 제공을 위하여 대부분의 객체 위치 추적 시스템은 GPS 기반의 추적 기법을 사용하고 있으나, 본 논문에서는 위치 트리거 모델을 제안하여 객체의 이동 위치에 따른 시점과 위치 특성과 같은 지능적 정보를 통한 효율적 저비용의 위치 추적 기법을 제시한다. 본 논문에서 제안하는 위치 트리거 모델은 객체 정보의 흐름에 대한 실시간 모니터링과 예외상황 발생 시 지능화된 경고/조치, 최적화된 이동 경로 수립 및 계획의 동적/지능적 재조정을 위한 객체추적 및 이동의 최적화를 목표로 하는 시스템을 구성하기 위해 사용될 수 있다.

• Proceedings of the KIEE Conference
• /
• 2008.07a
• /
• pp.2034-2035
• /
• 2008

본 논문은 RVM(Return Voltage measurement)을 이용하여 식물유와 광유에 따른 절연지의 수분 흡습성에 관한 특성을 비교하였다. 시험 절연재료로써 절연유는 각각 식물유(Bio Trans 1000,Cargill사)와 광유(제1종 2호, 동남석유(주))를 사용하였고, 절연지는 셀룰로오스계 크래프트 절연지를 사용하였다. 각 조건에서 IEEE/ANSI Standard C59.91-1981의 기대수명 곡선에서 $55^{\circ}C$ 절연을 기준으로하여 가속 열열화 시험을 수행한 후, $15^{\circ}C$씩 온도를 변화시켜 RVM 측정을 하였다.

• Journal of electromagnetic engineering and science
• /
• v.14 no.4
• /
• pp.367-375
• /
• 2014

In this paper, a novel triple-band circular-ring monopole antenna with a half-circular ring and ground slot for wireless local area network/Worldwide Interoperability of Microwave Access (WLAN/WiMAX) applications is proposed. The proposed antenna consists of one circular ring, a half-circular ring and a rectangular slot in the ground plane. Based on the concept, a prototype of the proposed triple-band antenna was designed, fabricated and tested. The numerical and experiment results demonstrated that the proposed antenna satisfied the -10 dB impedance bandwidth requirement while simultaneously covering the WLAN and WiMAX bands. Furthermore, this paper presents and discusses the 2D radiation patterns and 2D gains according to the results of the experiment.

• Journal of the Korean Institute of Electrical and Electronic Material Engineers
• /
• v.29 no.12
• /
• pp.824-828
• /
• 2016

In this study, effects of ICP (inductively coupled plasma) treatment on PAR thin film have been investigated. A maximum etch rate of the PAR thin films and the selectivity of PAR to PR were obtained as 110 nm/minand 1.1 in the $CF_4/O_2$ (5:15 sccm) gas mixture. We present the surface properties of PAR thin film with various treatment conditions. The surface morphology and cross section of the PAR thin film was observed by AFM (atomic force microscopy) and FE-SEM (filed emission scanning electron microscopy).

• Journal of the Korean Society of Manufacturing Process Engineers
• /
• v.11 no.6
• /
• pp.88-93
• /
• 2012

In this study, Machining fine shaft was examined by Lathe. method is proposed to control the thrust force to 0. through relationship between the cutting depth and the thrust force in turning, fine-shaft of less than 0.1mm diameter in turning is confirmed experimentally. also we propose practical expression to control thrust force in turning Through to change the approach angle, optimal tool design would be possible in turning.

• Proceedings of the Korean Society of Computer Information Conference
• /
• 2016.01a
• /
• pp.303-304
• /
• 2016

본 논문에서는 기존의 TCP/IP 체계에서 탈피하여 보안 및 성능을 개선하기 위한 방안으로 콘텐트를 기반으로 한 네트워크 체계에 대해서 소개한다. OT-OCN은 기존의 CCN(Contents Centric Network)을 기반으로 컨텐츠의 기능을 추가하여 이를 바탕으로 자율성을 부여한 새로운 개념의 패러다임이다. 이러한 OT-OCN의 개발사는 미국의 CAT, Inc.(Cyber Advanced Technology)라는 회사로 이 기술은 보안뿐만 아니라 CCN을 통한 통신의 효율성을 극대화하고 또한 사물인터넷(IoT) 등에 활용 가능한 최적의 메커니즘이다. 본 논문에서는 이 기술의 기본적인 매커니즘에 대한 간략한 소개를 통해 차세대보안의 개념을 설명하고자 한다.

• Journal of the Semiconductor & Display Technology
• /
• v.13 no.4
• /
• pp.83-90
• /
• 2014

This paper is about the yield rate of lower temperature furnace for wafer heat-treatment. The flat-zone that the temperature in furnace has uniform distribution specific area is the significant variable to the yield rate. In this study, we researched about the ways how to widen the flat zone in the furnace using CFD. As a result, we confirmed that the characteristic of the flat-zone was changed when SCU(Super Cooling Unit) was used. We considered temperature control with above.

• Proceedings of the KIPE Conference
• /
• 2017.07a
• /
• pp.481-482
• /
• 2017

본 논문에서는 케이블 고장 위치 검출을 위해 사용되고 있는 STDR(sequence time domain reflectomerty) 및 SSTDR(spread spectrum TDR) 기법의 성능을 향상시키기 위한 방법을 제안하였다. 제안된 방법은 시간-주파수 상관 분석을 이용하여 기준신호(reference signal)의 상관계수 최댓값 위치를 검출 한 후 기준신호를 제거하여 반사신호의 상관계수의 최댓값 위치를 검출하는 2단계 과정을 갖는다. 제안된 알고리즘은 저압 전력 케이블의 단선 및 합선 고장 검출 실험에서 보편적인 STDR 및 SSTDR 방법과의 성능 비교를 통해 입증하였다.