• Title/Summary/Keyword: Gyu-Dong Choi

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Comparative Analysis on Major Growth Responses of Shoot and Root of Ginseng Cultivated with Thinning out Method at Different Growth Stages and Year-Olds in Organic Culture of Panax C.A. Meyer (솎아내기 재배법에 의한 유기농 인삼의 생육시기 및 연근별 지상부와 지하부의 주요 생육특성 비교)

  • Lee, Gyeong-A;Park, Seong-Yong;Wu, Wen-Guo;Kim, Do-Hyun;Kim, Min-Su;Song, Beom-Heon;Park, Kee-Choon;Cha, Sun-Woo;Choi, June-Ha;Choi, Gyu-Dong
    • 한국약용작물학회:학술대회논문집
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    • 2012.05a
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    • pp.93-94
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    • 2012

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Comparative Analysis on Contents and Synthetic Amounts of Carbohydrates of Plant Tissues of Ginseng Cultivated with Thinning out Method at Different Growth Stages and Year-Olds in Organic Culture of Panax C.A. Meyer (솎아내기 재배법에 의한 유기농 인삼의 생육시기, 연근 및 식물체 부위별 탄수화물 함량 및 합성량 비교 분석)

  • Lee, Gyeong-A;Park, Seong-Yong;Wu, Wen-Guo;Kim, Do-Hyun;Kim, Min-Su;Song, Beom-Heon;Park, Kee-Choon;Cha, Sun-Woo;Choi, June-Ha;Choi, Gyu-Dong
    • 한국약용작물학회:학술대회논문집
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    • 2012.05a
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    • pp.95-96
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    • 2012

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Comparative Analysis on Contents of Carbohydrates with Different Growth Stages and Year-Olds of Ginseng Grown with Organic Cultivation in Paddy and Upland Fields (논과 밭 재배 유기농 인삼의 생육시기, 연근 및 식물체 부위별 수용성과 불수용성 탄수화물 함량 비교 분석)

  • Lee, Gyeong-A;Park, Seong-Yong;Wu, Wen-Guo;Kim, Do-Hyun;Kim, Min-Su;Song, Beom-Heon;Park, Kee-Choon;Cha, Sun-Woo;Choi, June-Ha;Choi, Gyu-Dong
    • 한국약용작물학회:학술대회논문집
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    • 2012.05a
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    • pp.85-86
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    • 2012

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Evaluation of Measurement Accuracy of Ground Impedances in Counterpoise according to Location of Auxiliary Electrodes (보조전극의 위치에 따른 매설지선의 접지임피던스 측정정확도의 평가)

  • Lee, Bok-Hee;Choi, Young-Chul;Choi, Jong-Hyuk;Kim, Dong-Kyu;Lee, Gyu-Sun;Yang, Soon-Man;Kim, Tae-Gi
    • Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
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    • 2009.05a
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    • pp.352-355
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    • 2009

  • The ground resistance has been used as a method of estimating the capability of counterpoise. When transient currents blow through a ground electrode, it is reasonable to evaluate the performance of ground electrode system as a ground impedance instead of ground resistance. However, the measurement method of ground impedance for counterpoise is not clearly presented. This paper describes the measurement method of ground impedance considering the earth mutual resistances and AC mutual coupling. When we measure the ground impedance, the error due to earth mutual resistances depends on the distance between the auxiliary electrodes and the electrode under test. The measurement accuracy of high frequency ground impedance is mainly influenced by the location of the current electrode and the potential electrode.

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Comparative Analysis on Contents of Carbohydrates with Different Growth Stages and Year-Olds of Ginseng Grown with Organic Cultivation on Fields Prepared with Two Different Crops of Rye and Sudan Grass (예정지 재배작물에 따른 유기농 인삼의 생육시기, 연근, 및 식물체 부위별 수용성과 불수용성 탄수화물 함량 비교 분석)

  • Lee, Gyeong-A;Park, Seong-Yong;Wu, Wen-Guo;Kim, Do-Hyun;Kim, Min-Su;Song, Beom-Heon;Park, Kee-Choon;Cha, Sun-Woo;Choi, June-Ha;Choi, Gyu-Dong
    • 한국약용작물학회:학술대회논문집
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    • 2012.05a
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    • pp.89-90
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    • 2012

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Comparative Analysis on Contents and Synthetic Amounts of Saponins of Shoot and Root of Ginseng Cultivated with Thinning out Method at Different Growth Stages and Year-Olds in Organic Culture of Panax C.A. Meyer (솎아내기 재배법에 의한 유기농 인삼의 생육시기 및 연근별 지상부와 지하부의 사포닌 함량 및 합성량 비교 분석)

  • Lee, Gyeong-A;Park, Seong-Yong;Wu, Wen-Guo;Kim, Do-Hyun;Kim, Min-Su;Song, Beom-Heon;Park, Kee-Choon;Cha, Sun-Woo;Choi, June-Ha;Choi, Gyu-Dong
    • 한국약용작물학회:학술대회논문집
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    • 2012.05a
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    • pp.97-98
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    • 2012

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A Context-aware BPEL Workflow System using Aspect-Oriented Programming (관점지향 기법의 상황인지를 지원하는 BPEL 워크플로우 시스템)

  • Kim, Min-Suk;Kuak, Dong-Gyu;Choi, Jong-Sun;Choi, Jae-Young
    • Proceedings of the Korea Information Processing Society Conference
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    • 2011.04a
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    • pp.207-210
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    • 2011

  • 표준 워크플로우 언어로 가장 인지도가 높은 BPEL은 분기를 통한 플로우선택에 있어 상황정보를 기술하기 어려워 유비쿼터스 컴퓨팅 환경에 적용하기 어렵다. 이를 위해 본 논문에서는 모듈간 낮은 결합도를 보장하는 관점지향 프로그래밍 (AOP: Aspect-Oriented Programming) 기법을 사용하여 기존 BPEL 워크플로우 시스템에 상황인지 기능을 추가한 시스템을 제안한다. 제안하는 상황인지 워크플로우 시스템은 AOP 기법을 사용하여 BPEL 워크플로우에 상황에 따른 서비스를 제공하기 위한 Context 정보를 삽입하는 방식으로 개발함으로써, 기존 BPEL 문서를 수정할 필요 없이 상황인지 기능을 적용한 워크플로우의 생성이 가능하다. 본 논문에서는 시나리오 기반의 실험을 통하여 제안한 시스템을 입증한다.

  • https://doi.org/10.3745/PKIPS.y2011m04a.207 인용 PDF

Switching Characteristic Analysis of 3kW Single-Phase Inverter based on GaN HEMT (GaN HEMT를 적용한 3kW급 단상 인버터의 스위치 특성 분석)

  • Han, Seok-Gyu;Choi, Su-Ho;Joo, Dong-Myoung;Park, Jun-Sung;Choi, Jun-Hyuk
    • Proceedings of the KIPE Conference
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    • 2020.08a
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    • pp.294-295
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    • 2020

  • 차세대 전력반도체 중 하나인 GaN HEMT(Gallium Nitride High Electron Mobility Transistor)는 낮은 온 저항, 고속 스위칭 및 낮은 출력 커패시턴스 특성을 가지므로 더 높은 전력밀도를 달성할 수 있다. 그러나 낮은 문턱 전압 및 높은 dv/dt로 인해 외부 요인에 취약하다. 본 논문에서는 GaN HEMT를 3kW급 단상 인버터에 적용 시 발생한 문제점을 분석하고 해결방안을 제시한다.

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Improvements of Efficiency in White OLED using Zn-complexes (Zn-complexes를 이용한 White OLED의 효율 향상 관한 연구)

  • Kim, Dong-Eun;Choi, Gyu-Chae;Kwon, Young-Soo
    • Proceedings of the KIEE Conference
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    • 2008.05a
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    • pp.167-168
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    • 2008

  • Organic light emitting diodes (OLEDs) show a lot of advantages for display purposes. Because OLEDs provide white light emission with a high efficiency and stability, it is desirable to apply OLEDs as an illumination light source and back light in LCD displays. We synthesized new emissive materials, namely $Zn(HPB)_2$ and Zn(HPB)q, which have a low molecular compound and thermal stability. We studied white OLEDs using $Zn(HPB)_2$ and $Zn(PQ)_2$. The fundamental structures of the white OLEDs were ITO / NPB (40 nm) / $Zn(HPB)_2$ (40 nm) / $Zn(PQ)_2$ (20 nm) / LiAl (120 nm). As a result, we obtained a maximum luminance of $4200cd/m^2$ at a current density of $440mA/cm^2$. The CIE (Commission International de l'Eclairage) coordinates are (0.319, 0.338) at an applied voltage of 10 V.

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