배향 성장시킨 은박막중의 결함생성

이기선,김기수,Lee Ki-Seon,Kim Key-Soo 한국현미경학회 1976 Applied microscopy Vol.6 No.1

Formation of crystal defects which may occur during and after the vacuum deposition of silver films on rocksalt substrates were studied by electron microscopy. To obtain defect free films, various evaporation conditions, such as evaporation rate, substrate temperature, substrate treatments and annealing of films were examined. Stacking faults and micro-twins are dominant defects in silver films.

진공차단기용 전자식 센서의 선정 및 노이즈 시험에 관한 연구

이기선,박정철,추순남,Lee, Ki Seon,Park, Jung Cheul,Chu, Soon Nam 한국정보통신학회 2014 한국정보통신학회논문지 Vol.18 No.10

본 연구는 진공차단기 기계식 보조접점(MOC)의 구조적인 취약성을 해결하기 위해 전자식 센서 기술을 이용한 전자식 보조접점(EOC) 개발에 선행되어야할 센서의 선정 및 노이즈 시험에 관한 것으로, 기존 기계적 보조접점(MOC)에서 발생하는 반복적인 떨림 및 반동 현상에 의한 접점 오동작을 최소화하는 제품을 개발하는 것을 최종 목표로 하였다. 실험 결과, 차단기 투입 및 개방시 개방시의 써지전압 상승속도가 투입시 보다 4.2배 빠른 것으로 측정되었고, 소음크기는 각각 120dB, 110dB로 측정되었다. 상용주파과전압 60kV를 인가하였을 때 진공차단기 투입 및 개방시 센서에서 출력되는 파형은 일그러짐이 없이 정상적으로 동작됨을 알 수 있었다. 그리고 150kV $1.2{\times}50{\mu}s$의 충격파를 인가하였을 때 센서의 투입 및 개방측 출력접점의 전압파형이 일그러짐이 없이 정상상태를 유지하였으며, 2500A의 전류를 인가하였을 때 자계 잡음을 측정한 결과, 전압파형이 일그러짐이 없이 정상적으로 동작하였다. This study is about the selection and noise test of electronic sensor which is preceded by electric Operating Cell(EOC) development using electronic sensor technology to solve the structural weakness of Mechanism Operated Cell(MOC) in VCB, and has a final target in product development minimizing contact malfunction of the chattering or rebounce states caused by existing MOC. In this test results, when opening and closing VCB, rising velocity of surge voltage in opening time was measured 4.2 times faster than closing time and noise decibel value was measured respectively 120dB and 110dB. When supplying 60kV power frequency overvoltage, we found that sensor output graph in VCB opening and closing times operated stably without distortion. When supplying 150kV $1.2{\times}50{\mu}s$ impulse frequency voltage, we found that voltage graph of output contact in sensor opening and closing sides maintained a normal condition without distortion, and when supplying 2500A current, we found that tested result of electric field noise operated stably without distortion.

국내 전력수급 방안

이기선,Lee, Ki-Seon 한국기술사회 2011 技術士 Vol.44 No.2

In recent years, maximum electric power demand has been increasing steadily. But, Electric Power Supply & Demand problem is occurring due to lack of electric power reserve ratio caused by electric power peak. For this reason, I investigated the current status of the Electric Power Supply & Demand and established Electric Power Supply & Demand and established Electric Power Supply & Demand measures. I will expect that this paper will be contributed balanced and stable Electric Power Supply & Demand management.

Direct Observations of Al-Si Junction Interface

이기선,Lee Ki-Seon Korean Society of Electron Microscopy 1978 Applied microscopy Vol.8 No.1

Al-Si junctions were made by vacuum deposition of aluminium on to silicon wafers and examined by TEM. The uneven interfaces of the junctions are formed due to the surface tension of the molten solution resulting in preferential dissolution of silicon in aluminium at some areas. These undesirable uneven interfaces affect the junction shape and so the over-all characteristics of the devices.

터빈 블레이드 팁 형상과 간극 크기에 따른 전압 손실 연구

이기선(Ki Seon Lee),박승덕(Seoung Duck Park),노영철(Young Chul Noh),곽재수(Jae Su Kwak),전용민(Yongmin Jun) 한국유체기계학회 2008 유체기계 연구개발 발표회 논문집 Vol.2008 No.-

Leakage (Jaw through turbine blade tip gap causes strong leakage vortex on the blade suction side and induces large aerodynamic losses. In this study. The conventional plane tip and various squealer tip blades wore tested in a linear cascade in order to measure the effect of the tip shape on the aerodynamic loss by the tip leakage vortex Three tip gap clearances of 0.6%. 1.39'c. and 2.0% of blade span were tested. Flow measurement was conducted at one chord downstream from the trailing edge with five-hole probe. Results showed that the leakage vortex was stronger than passage vortex and the mass averaged overall total pressure loss through the cascade was the lowest for suction side tip compared to other tested tip cases. For all tested cases. the mass averaged overall total pressure loss was higher at 1.3% of tip gap clearance.

진공차단기용 전자식 보조접점 컨트롤러 개발 및 성능인증시험에 관한 연구

이기선(Ki-Seon Lee),박정철(Jung-Cheul Park),추순남(Soon-Nam Chu) 대한전기학회 2015 전기학회논문지 P Vol.64 No.3

This study is about the controller development of the Electric Operating Cell(EOC) which will replace the Mechanical Operated Cell(MOC) of the vacuum circuit breaker which has been used in the power plant and the performance test for the developed controller. The controller developed through this study was manufactured considering the harsh installation environment and electrical condition of the power plant, and the controller performance certification test for confirming the product reliability was taken to know whether or not to withstand fully in various electrical and mechanical problems. Items for performance certification test were AC power frequency voltage withstand test, combined surge immunity test, 1 [MHz] oscillatory SWC test, fast transient SWC test, radiated electromagnetic interference test, vibration test. As a result, all tests has passed an examination without malfunction.

수직축 풍력터빈의 유동해석에 관한 연구

이기선(Ki-Seon Lee),박정철(Jung-Cheul Park) 대한전기학회 2017 전기학회논문지 P Vol.66 No.4

This paper did basic study on the vertical-axis wind turbine. Namely, This paper was try to find the optimum conditions by using the ANSYS CFX simulation program through the changes of the main-blade angle and sub-blade angle. Main-blade Shape #4 angle 45 ° compared to others Shape angle 0 ° was increased by 157.2[%] to 263.2[%] in the power output and was increased by 110[%] to 250[%] in the power coefficient. Also, when the Shape #5 Fin length of main-blade doubles, because the power output was 70.8[%] compared to Shape #1 and 27.5[%] compared to Shape #4, and the power coefficient was 60[%] compared to Shape #1 and 28.6[%] compared to Shape #4, the power output and the power efficiency were rather reduced. The output current of Shape #4 was increased 109.9[%] compared to Shape #1 and increased 250[%] compared to Shape #5, and The output voltage of Shape #4 was increased 22.5[%] compared to Shape #1 and increased 3.7[%] compared to Shape #4.

발전기 여자기시스템 주제어전원공급장치 국산화 개발

이기선(Ki-Seon Lee),박정철(Jung-Cheul Park),추순남(Soon-Nam Chu) 대한전기학회 2016 전기학회논문지 P Vol.65 No.2

The main target in this paper is the localization of VME Type EPSM in Generator Exciter(EX2100) System. Developed EPSM has the compatibility with the existing product in the structure and shape and electrical feature and so on, but it has a much improved capacity and reliability in comparison with origin company product. this paper, to improve these functions, put emphasis on protection, monitoring, power capacity increase(over 120%), an enlarged scale of input voltage supply, AC/DC dual voltage use and so on. After manufacturing product localization, it was carried out several tests for the performance and reliability verification of developed product. These tests were performed in Authorized Inspection Agency(KTL) and field application test and maker self-test were additionally performed. Finally, the results of all tests were “success”.

아쟁 시나위의 선율 구성 특징 고찰 - 윤윤석 아쟁 시나위 굿거리 4종을 중심으로 -

이기선(Lee, Ki Seon) 한국국악교육학회 2024 국악교육 Vol.54 No.54

1950년을 전후하여 여성국극 및 창극(국극)단은 급격한 발전을 하였으며, 극의 내용과 상황에 따라 즉흥적으로 연주 가능한 뛰어난 반주자들도 동반 성장하였다. 윤윤석은 탁월한 즉흥연주를 소화할 수 있는 아쟁 반주악사였으며, 단체 활동을 기반으로 닦여진 즉흥연주 실력으로 기악 및 무용 시나위의 연행 현장에서 당대 최고의 아쟁 연주자로서 활동하였다. 일면 즉흥적으로 연주되는 시나위라 할지라도 특유의 내재되어 있는 선율이 존재하는 것을 윤윤석 아쟁 시나위 굿거리 4종을 살펴본 결과 확인되었으며, 음원 1을 기준으로 음원 2~4와의 상호간의 선율 비교를 통해 공통적으로 나타나는 특징은 다음과 같이 요약할 수 있다. 첫째, 도입 부분에서 음원에 따라 한옥타브의 음역과 간음의 차이로 일견 다른 선율로 느껴지지만 동일 선율이며, 도입 선율로서 유형화하여 연주하고 있음이 확인되었다. 둘째, 전개 부분에서 원선율에 새로운 선율을 추가하거나, 한 장단을 두 장단에 걸쳐 확대하여 연주하고 있음이 확인되었다. 셋째, 1~3차 상청진행 부분에서 시작 선율은 반복되어 상청진행을 위한 유형화된 선율로 사용되었으며, 엇박을 통한 긴장감 있는 리듬감의 표현, 종지선율과 종지형도 반복되고 있음이 확인되었다. 넷째, 하청진행 부분 역시 시작 선율은 반복되어 하청진행을 위한 유형화된 선율로 사용되었으며, 종지선율도 반복되고 있어 자주 사용하는 선율로 확인되었다. 다섯째, 중청진행 부분의 종지형과 종결 부분의 종지선율도 동일 및 유사하게 반복된 모습을 보여주어 빈번하게 활용되는 선율임이 확인되었다. 이상을 통해 윤윤석 아쟁 시나위 굿거리 4종의 선율 구성 특징에 대해 파악해 보았으며, 각기 다른 음원에서의 아쟁 시나위 선율이 즉흥적으로 연주되는 것 같지만, 그 안에 공통 어법으로 사용하는 선율이 존재한다는 것을 구체적으로 확인할 수 있었다. 앞으로도 아쟁 시나위의 선율 구성 방식에 대한 보다 다양한 관점의 연구과 활발히 이루어지기를 기대한다. In the years around 1950, actress Gukgeuk and traditional Korean opera (Changgeuk) underwent rapid development. Accompanying this growth, exceptinoal accompanists capable of spontaneous performances, depending on the plays content and situation, also flourished. Yoon Yoon-seok was an outstanding Ajaeng accompanist with the ability to master excellent improvisational performances. Utilizing skills honed through group activities, he operated as the foremost Ajaeng performer fo his time in the instrumental and dance accompaniment scenes of Sinawi. Even though Sinawi may be played spontaneously in some aspects, an examination of unique inherent melodies. Through a comparison of melodies between Track 1 and Tracks 2-4, common characteristics were identified as follows. Firstly, despite apparent differences in octave range and intervals among tracks, it was confirmed to be the same standardized introductory melody. Secondly, in the development section, it was observed that new melodies were introduced based on the original melody, or they were expanded across one or two phrases. Thirdly, in the Sangcheong progression of phases 1 to 3, the initial melody was repetitively used as a standardized motif for the Sangcheong phase progression. Expressions of rhythmicity through syncopation, as well as the repetition of concluding melodies and patterns, were identified. Fourthly, in the Hacheong progression, the initial melody was similarly repeated, serving as a standardized motif for the Hacheong progression. The concluding melody was also reiterated, confirming its frequent use in the Jungcheong progression. Fifthly, the motifs in the Jungcheong progression and the concluding melody in the concluding section exhibited consistent and similar repetition, confirming the frequent utilization of these melodic patterns. Through the above analysis, it had a chance to gain insights into 4 types of melodic structures of Yoon Yoon-seoks Ajaeng Sinawi Gutgeorijangdan rhythmic cycle, revealing distinctive features. While the Ajaeng Sinawi melodies in various musical genres seem to be played spontaneously, a concrete observation confirms the existence of common melodic patterns utilitzed across them. Hopefully, there will be active research on various perspectives regarding the melodic composition of Ajaeng Sinawi in the future.

블레이드 팁 형상이 터빈 캐스케이드 전압 손실에 미치는 영향에 대한 연구

이기선(Ki Seon Lee),박승덕(Seoung Duck Park),노영철(Young Chul Noh),김학봉(Hark-Bong Kim),곽재수(Jae Su Kwak),전용민(Yongmin Jun) 한국유체기계학회 2009 한국유체기계학회 논문집 Vol.12 No.2