• 대한전기학회:학술대회논문집
• /
• 대한전기학회 2005년도 추계학술대회 논문집 전기설비전문위원
• /
• pp.80-82
• /
• 2005

Lightning surge damages of low voltage equipments in building are increasing due to increase in electrical and communication networks in the information-oriented society. And electrical circuits with semiconductor are very weak against lightning surge. To achieve effective method of surge protection on low voltage lines, there are needs for the relationship between propagation aspects of lightning surge and arrangement of indoor wire. This paper describes the experimental study on the relationship between them. This result may be raw data for establishment of surge protection system.

• 대한전기학회:학술대회논문집
• /
• 대한전기학회 1998년도 추계학술대회 논문집 학회본부A
• /
• pp.282-285
• /
• 1998

This paper presents a method to evaluate the effect of voltage sag in distribution system using the component reliability data of utilities. The proposed method is based on Specified CBEMA curve which is the probability curve of the customers' effect by voltage sag. We carried out the experiment for the customers' sensitive equipments using the test facilities in KERI. The Monte Carlo method and the historical reliability data in KEPCO are used for simulations.

• 한국정보통신학회논문지
• /
• 제20권3호
• /
• pp.599-606
• /
• 2016

본 논문에서는 NFC 통신기술 기반의 스마트밴드를 이용하여 스포츠 센터의 운동기구를 예약하여 사용할 수 있도록 하는 운동기구 예약 시스템을 설계하고 구현한다. 사용자는 스마트밴드를 통하여 언제 어떤 운동 기구를 사용해야 하는지 알림 정보를 수신할 수 있다. 사용자는 추천 운동 프로그램을 활용하여 운동을 할 수 있고, 피크 시간에도 대기인원이 없기 때문에 편하게 원하는 운동기구를 사용할 수 있다. 또한, 관리자는 효율적인 시설관리를 통해 비용을 절감할 수 있고 수집된 운동 정보를 통해 사용자에게 맞춤 정보를 제공함으로써 경쟁력 있는 센터 운영이 가능하다.

• 대한전기학회:학술대회논문집
• /
• 대한전기학회 2008년도 춘계학술대회 논문집 전기설비전문위원
• /
• pp.176-178
• /
• 2008

최근 전력전자 기기와 같은 비선형 부하의 증가로 계통에서 고조파 발생 가능성은 점점 높아지는 추세이다 이러한 계통의 고조파는 부하 설비 중 누전차단기 오동작 및 과부하 등의 원인이 되므로 전기설비 안전 측면에서 중요하게 다루어질 필요가 있다. 고조파에 대한 해결책으로는 수동필터 및 능동전력필터를 들 수 있는데 본 연구에서는 기존의 3상 풀브리지 스위칭 회로를 이용한 능동필터에 비해 안정성 및 대용량 시스템 구성에 유리한 모듈형 능동 전력 필터를 제안하였다.

• 대한의용생체공학회:학술대회논문집
• /
• 대한의용생체공학회 1995년도 추계학술대회
• /
• pp.71-73
• /
• 1995

In this paper, we reviewed the ACR-NEMA Digital Imaging and Communications in Medicine (DICOM) standard that was developed for medical imaging equipments interconnected on the standard networks. We also built a simple system that can transmit JPEG compressed DICOM file on network environment and display this medical image on remote-machine.

• 대한전자공학회:학술대회논문집
• /
• 대한전자공학회 2002년도 ITC-CSCC -2
• /
• pp.1200-1203
• /
• 2002

A temperature compensated Crystal Oscillator is widely used for the stable frequency source of mobile communication equipments. Recently, it has become necessary to reduce power consumption of TCXOs. In this paper, we have proposed a TCXO using weak inversion MOS transistors and have evaluated its fundamental characteristics.

• 대한전기학회:학술대회논문집
• /
• 대한전기학회 2015년도 제46회 하계학술대회
• /
• pp.1022-1024
• /
• 2015

An auxiliary switching power supply is designed for the control circuit of a machine integrated with frequency variation based on TOP249Y in this paper. And experiments have been conducted to verify that this power supply can function well even with fluctuating inputs, indicating the validity of this switching power supply and it can be applied to supply some other electrical equipments.

• 대한전기학회:학술대회논문집
• /
• 대한전기학회 1987년도 정기총회 및 창립40주년기념 학술대회 학회본부
• /
• pp.477-479
• /
• 1987

An understanding of dielectric breakdown characteristics in cryogenic liquids is of importance in the development of various cryogenic and superconducting electrical equipments. This investigation describes measurements of pulse breakdown voltage, polarity effect, conditioning effect and time lag characteristics of cryogenic liquids.

• KIEE International Transactions on Power Engineering
• /
• 제5A권2호
• /
• pp.97-102
• /
• 2005

Voltage sags are the most widespread quality issues affecting distribution systems. This paper describes in some detail the voltage sag characteristics due to different types and locations of fault in a practical low voltage power distribution system encountered in the UK. The results not only give utility engineers very useful information when identifying parts of the system most likely to pose problems for customer equipments, but also assist the facility personnel to make decisions on purchasing power quality mitigation equipment.

• 대한전기학회논문지
• /
• 제38권9호
• /
• pp.684-692
• /
• 1989

An expert system which is a part of artificial intelligence is developed for controlling violated voltages. Control equipments such as shunt capacitors, inductors, transformer tap changers and generator voltages are utilized. A breadth-first search method is used. A sensitivity tree is suggested to minimize the number of control devices. If the voltage condition program should be utilized to efficiently solve the problem. The expert system uses PROLOG and for the sub-program C language is used. This expert system, when applied to an 8 bus power system, shows satisfactory results.