• 제목/요약/키워드: Hyung-Ki

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Edge Cut Process for Reducing Ni Content at Channel Edge Region in Metal Induced Lateral Crystallization Poly-Si TFTs

  • SEOK, Ki Hwan;Kim, Hyung Yoon;Park, Jae Hyo;Lee, Sol Kyu;Lee, Yong Hee;Joo, Seung Ki
    • JSTS:Journal of Semiconductor Technology and Science
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    • v.16 no.2
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    • pp.166-171
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    • 2016
  • Nickel silicide is main issue in Polycrystalline silicon Thin Film Transistor (TFT) which is made by Metal Induced Lateral Crystallization (MILC) method. This Nickel silicide acts as a defect center, and this defect is one of the biggest reason of the high leakage current. In this research, we fabricated polycrystalline TFTs with novel method called Edge Cut (EC). With this new fabrication method, we assumed that nickel silicide at the edge of the channel region is reduced. Electrical properties are measured and trap state density also calculated using Levinson & Proano method.

Thermal Hydraulic Analysis Methodology for PWR Nuclear Power Plant Steam Generators (원전 가압경수로 증기발생기 열유동 해석법)

  • Choi, Seok-Ki;Nam, Ho-Yun;Kim, Eui-Kwang;Kim, Hyung-Nam;Jang, Ki-Sang;Hong, Sung-Yull
    • Proceedings of the KSME Conference
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    • 2001.06e
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    • pp.463-468
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    • 2001
  • This paper presents the methodology for thermal hydraulic analysis of Pressurized Water Reactor (PWR) steam generators. Topics include porous media approach, governing equations, physical models and correlations for solid-to-fluid interaction and heat transfer and numerical solution scheme. Some details about the ATHOS3 code currently used widely for thermal hydraulic analysis of PWR steam generators in the industry are presented. The ATHOS3 code is applied to the thermal hydraulic analysis of steam generator in the Korea YGN 3&4 nuclear power plant and the computed results are presented.

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Design of the Ground Resistance Measuring System to the Earth-Noise

  • Jung Min-Jae;Joo Hyung-Jun;Lee Ki-Hong;Oh Sung-Up;Jung Jae-Ki;Seong Se-Jin
    • Proceedings of the KIPE Conference
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    • 2001.10a
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    • pp.566-570
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    • 2001
  • Generally, grounding systems are responsible for the safe operation of a power system. Their performance guarantees equipment protection and personnel safety under condition of the limited ground potential rise and touch voltages as well as step voltages under ground fault conditions. Therefore, it is necessary to measure the ground resistance frequently for checking the performance of grounding system, In this paper the ground resistance measuring system using digital signal processor and high-performance L-C resonant band pass filter is presented. The signal current magnitude for measuring ground resistance in this system is $10^{-1}[A]\;to\;5\times10^{-2}[A]$ and the current frequency is 30[Hz].

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Patent map for wind turbine component (풍력발전기 요소기술의 특허맵 분석)

  • Shin, Hyun-Ki;Jang, Moon-Seok;Bang, Hyung-Joon;Kim, Yong-Ki;Lee, Yu-Mi
    • 한국신재생에너지학회:학술대회논문집
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    • 2008.05a
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    • pp.297-299
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    • 2008
  • 기술 개발과 산업화에 있어 현대 사회에서는 특허의 중요성이 점점 커지고 있다. 이 점은 풍력발전기 분야에서 역시 예외가 아니다. 따라서 기술 개발 이전에 해당 기술 분야에 대해 특허를 조사하고 특허맵을 구축하는 것이 필요하다. 또한 특허맵의 구축을 통하여 풍력 발전기 분야의 기술 개발 동향 및 경쟁 업체의 기술 개발 현황 등에 대하여 파악이 가능하다. 본 논문에서는 풍력발전기의 레이아웃과 드라이브 트레인, 그리고 요 시스템에 대하여 해당 특허에 대한 조사 및 특허맵에 대하여 이야기 하고자 한다.

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The Evaluation of Reliability for the High pressure hydrogen Storage System of Fuel Cell Vehicle(II) (연료전지자동차의 고압수소저장시스템 신뢰성 평가(II))

  • Choi, Young-Min;Kim, Sang-Hyun;Kim, Hyung-Ki;Jang, Gyu-Jin;Ahn, Byung-Ki;Lim, Tae-Won
    • 한국신재생에너지학회:학술대회논문집
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    • 2008.05a
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    • pp.37-40
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    • 2008
  • We have concentrated on the performance improvement of each part for durability, safety and cost of high pressure storage system for fuel cell vehicle so far. But for the mass production of fuel cell vehicle, it is necessary to evaluate durability and safety in system module. We built the standard to evaluate and collision safety of high pressure storage system for fuel cell vehicle, and could verify reliability of high pressure storage system.

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Thermal-Hydraulic Analysis of Kori Unit-1 Steam Generator Using ATHOS3 Code (ATHOS3 코드에 의한 고리1호기 증기발생기 열유동해석)

  • Choi Seok-Ki;Nam Ho-Yun;Kim Eui-Kwang;Kim Hyung-Nam;Jang Ki-Sang;Hong Sung-Yull
    • 한국전산유체공학회:학술대회논문집
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    • 2001.10a
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    • pp.106-111
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    • 2001
  • This paper presents the numerical methodology of ATHOS3 code for thermal hydraulic analysis of Pressurized Water Reactor (PWR) steam generators. Topics include porous media approach, governing equations, physical models and correlations for solid-to-fluid interaction and heat transfer, and numerical solution scheme. The ATHOS3 code is applied to the thermal hydraulic analysis of steam generator in the Korea Kori Unit-1 nuclear power plant and the computed results are presented.

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Measurement of the permittivity of insulation oil at UHF Band using TDR Method (TDR을 이용한 극초단파 대역에서 절연유 유전율 측정)

  • Goo, Sun-Geun;Ju, Hyung-Jun;Park, Ki-Jun;Han, Ki-Seon;Yoon, Jin-Yul
    • Proceedings of the KIEE Conference
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    • 2008.05a
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    • pp.173-174
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    • 2008
  • Time Domain Reflectometry(TDR) 기법을 응용하여 극초단파 대역을 포함하는 광대역 주파수범위에서 절연유의 유전율을 쉽게 측정할 수 있는 기법을 제안하였다. 수 GHz 이상의 대역에서의 절연유 유전율은 전자파를 이용한 전력용 변압기 부분방전 발생위치 추정에 필수적인 정보이나 기존의 방법으로 간단히 측정할 수 없었다. 본 기법은 동축구조에서 전자파 진행속도가 절연매질 유전율의 함수로 인가된 펄스파의 매질에 대한 동축선로에서 진행시간을 계산함으로써 유전율을 구하는 간단한 방법이다. 제안한 새로운 방법을 이용해 절연유중 1종4호 신유의 경우 광대역에서의 유전율은 2.1임을 알 수 있었다.

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열가속 열화에 따른 NBR의 산화반응과 기계적 특성

  • Kim, Ki-Yup;Kang, Hyun-Gu;Ryu, Boo-Hyung;Lee, Chung;Im, Ki-Jo
    • Proceedings of the Korean Institute of Industrial Safety Conference
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    • 2003.05a
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    • pp.434-439
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    • 2003
  • 원전 계통에서는 gas circulator, fuel handling system 등에 수 천여 개의 봉합(seal) 부위가 존재하며, 그 형상 또한 5 mm 에서부터 600 mm로 다양하다. 이러한 sealing 재료는 사용온도가 유리전이온도 이상인 열가소성 수지이며, 유연성 있는 segment의 조합으로 자유운동을 가지게 되는데 이러한 구조는 비교적 낮은 방사선 선량에 대해 취약하며, 원전계통에서는 NBR 및 ethylene-propylene 계열의 높은 내방사선 특성을 가지는 O-ring이 주로 사용되어지며, 10년을 교체시기로 주기적으로 교체하는 실정이다[2]. 이러한 seal 부위는 공정 전체에 걸쳐 다양한 열화요인에 노출되며, 최대 20$0^{\circ}C$의 온도, 압력 40 bar, 연간 1Gy~1MGy의 방사선에 노출된다.(중략)

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The relationship of the articulation and the EMG of sternohyoid muscle (조음 발성과 흉골설골근 근전위와의 관계)

  • Min, Hea-Jung;Bong, Jung-Pyo;Choi, Hong-Shik;Yoon, Hyung-Ro
    • Proceedings of the KOSOMBE Conference
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    • v.1997 no.05
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    • pp.257-260
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    • 1997
  • In this paper, we studied about the EMG of sternohyoid muscle(SH) during articulation. we selected /ki/ as the word that use subaxial a little, and /pa/, /pan/ as the word that use subaxial very much. The subjects were 4 persons with normal larynx. We indicated them to unify the amplitude of SH EMG during /ki/, /pa/, /pan/ phonation, and measured the amplitude of SH EMG between a phoneme and a phoneme.3 At the results, we found that the subjects can not control to unify the amplitude of EMG during articulation.

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