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.

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.

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.

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.

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.

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

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”.

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.

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.

박대성류 아쟁산조 엇모리장단의 선율과 리듬형 고찰

이기선(Lee, Ki Seon) 한국국악교육학회 2023 국악교육 Vol.53 No.53

본고는 아쟁산조에서 엇모리를 구성하고 있는 박대성류 아쟁산조를 대상으로 하여 선율 특징과 리듬의 결합 형태 및 주요 리듬형에 대해 고찰하였다. 1979년 발매된 오아시스 레코드에 수록된 박대성류 아쟁산조 엇모리는 아쟁산조 구성에서 엇모리 장단이 정식 녹음된 첫 음반으로 추정된다. 엇모리의 위치는 중중모리와 자진모리 사이에 두어 두 장단을 자연스럽게 잇는 연결기능과 점차 빠른 장단으로 향해가는 템포의 효과를 주었다. 첫 번째로 선율 특징을 분석한 결과 도입부에서 내드름의 효과를 위하여 엇모리 기본 장단형이 강조되어 있으며, 제2-3단락에서 유사 종지선율이 반복 사용되었다. 선율을 점차적으로 상행 또는 하행진행시킬 때 변화와 긴장감을 더하기 위하여 밀붙임, 엇박, 소리끌기의 붙임새를 적극 활용하였다. 두 번째로 리듬의 결합 형태 및 주요 리듬형을 분석한 결과 기본 리듬형은 전체 95%에 이르며, 6가지 유형으로 구분되고, 변화 리듬형은 전체 5%에 해당하며, 2가지 유형으로 구분 되었다. 이와 같이 박대성류 아쟁산조 엇모리의 한 장단은 기본 리듬형을 그대로 사용하거나, 이를 활용한 리듬이 매우 활발하게 나타났다. 연구를 통해 박대성류 아쟁산조 엇모리의 선율과 리듬형의 음악적 특징에 대해 파악할 수 있었다. 본고는 아쟁산조의 장단구성에 대한 인식을 제고하고, 그간 논의되지 않았던 아쟁산조의 엇모리에 대해 연구하였다는 점에서 의의가 있다. This study focuses on the melodic characteristics and rhythmic patterns in the Park Daeseong-style Ajaengsanjo, which comprises Eotmori within Ajaengsanjo. Eotmori rhythm included in the 1979 release on Oasis Records is presumed to be the first official recording of this particular component within Park Daeseong-style Ajaengsanjo. In Park Daeseong-style Ajaengsanjo, the placement of Eotmori is intended to serve as a connecting element between Jungjungmori and Jajinmori, smoothly bridging the two segments, while gradually increasing the tempo for a dynamic effect. First of all, the analysis of melodic features reveals that the composition consists of a total of six sections, with each section comprising 4 to 22 rhythms. The pitch range extends from the lowest note G’(Mi) to the highest note f’(Le), and the concluding notes for each section are c(La) for sections 1 to 5 and eb(Do)⁀d(Si) for section 6. The key of this music is c(La) gyemyun mode for all 1 to 6 sections. The introductory section emphasizes Eotmori pattern for a descending effect and sections 2 and 3 repeat a similar ending melody. Rhythmic variations are introduced to the melodic progression to gradually ascend or descend the melody, and techniques like clustering, syncopation, and note dragging are actively used to create tension. Second, in terms of combining rhythms and analyzing the primary rhythmic patterns, the basic rhythmic patterns accounted for a total of 95%, divided into 6 types. Conversely, variant rhythmic patterns constituted 5% of the total, categorized into 2 types. Consequently, in the context of Korean traditional music terminology, the compositions within Park Daeseong style or the Ajaengsanjo genre either employed the basic rhythmic patterns as is or showcased a highly dynamic use of these rhythms. Through this study, it was possible to grasp the musical characteristics of Park Daeseong-style Ajaengsanjo and enhance understanding of the structure of Ajaengsanjo compositions. Additionally, the significance lies in researching the hitherto unexplored aspects of Ajaengsanjo’s variations.