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유도전동기 속도검출을 위한 최적 제어시스템에 관한 연구
이강연(K.Y Lee),이진섭(J.S Lee),조금배(G.B Cho),이상일(S.I Lee),백형래(H.L Baek) 전력전자학회 1997 전력전자학술대회 논문집 Vol.1997 No.-
In this paper, a instantaneous speed measurement method using a three phase sinusoidal encoder is described and it's simulations are developed. The proposed method can easily detect the AC motor speed by using that the encoder is propotion to the AC motor speed.<br/> The performance of proposed method is confirmed by computer simulation and experiment results, The high accuracy of the optimum control system, AC motor speed detection is designed and proposed.
이강연(K.Y. LEE),최연옥(Y.O. CHOI),백형래(H.L.BAEK),조금배(G.B.CHO),이성길(S.G.LEE),김동휘(D.H.KIM) 전력전자학회 2004 전력전자학술대회 논문집 Vol.- No.-
This paper presents experimental operation with utility invertactive 3㎾ photovoltaic generation system. And that describe configuration of utility interactive photovoltaic system which power supply for Demonstration experiment.. The status of photovoltaic generation system comp-onents and interconnection and safety equipment will be summarized. This paper discusses property operation state which system endure division of power for demonstration experiment.
수계에서 제타전위를 이용한 이산화티탄의 분산특성에 대한 평가
이강연 ( Kang-yen Lee ),조춘구 ( Byung-jun Park ),박병준 ( Joong-koo Kim ),김중구 ( Choon-koo Zhoh ),김봉남 ( Bong-nam Kim ) 대한화장품학회 2007 대한화장품학회지 Vol.33 No.2
제타전위를 이용하여 이산화티탄의 분산 안정성을 평가하고 이를 통하여 분산안정도 향상에 응용하고자 하였다. 본 연구에서는 제타전위와 관련된 전기이중층, 전기영동, 등전점 및 전기 침투에 대하여 설명하였으며 측정이론을 기술하였다. H-S equation을 이용하여 수계에 분산된 미립자 이산화티탄의 pH변화에 따른 제타전위 변화를 측정하였으며 제타전위는 pH 3.0~9.0에서 음의 값으로 측정되었다. 제타전위 값은 pH값 상승에 따라 절대값이 증가하였으며 분산액의 pH 8.0과 9.0에서는 지속적으로 분산이 유지되었다. 이를 통하여 제타전위가 이산화티탄의 분산에 영향을 미치며 제타전위의 절대값 크기가 수계에서 이산화티탄의 분산안정도에 중요한 역할을 하는 것으로 생각된다. The stability of titanium dioxide dispersion was evaluated by zeta (ζ) potential and we intended to apply it for improvement of dispersion stability. Both theories related to ζ potential (electric double layer, electrophoresis, isoelectric point and electroosmosis) and a method to measure ζ potential were explained in this study. The change in ζ potential of TiO<sub>2</sub> dispersion was measured by means of Henry's function of Helmholtz-Smoluchowski's equation (H-S equation). The ζ potentials of TiO<sub>2</sub> dispersion were negative in all measured pH values (3.0~9.0), and absolute values of ζ potentials of TiO<sub>2</sub> increased as pH values increased. TiO<sub>2</sub> dispersion was maintained in pH 8.0 and 9.0 respectively. From these results, we suggest that ζ potentials have an effect on TiO<sub>2</sub> dispersion and absolute value of ζ potentials played an important role in the stability of TiO<sub>2</sub> dispersion in aqeous medium.
이강연 ( Kang Yun Lee ),한창규 ( Chang Giu Han ),조춘구 ( Choon Koo Zhoh ) 대한화장품학회 1999 대한화장품학회지 Vol.25 No.3
기능성 물질로서 다양한 생리적 기능을 가진 ascorbic acid는 구조적으로 불안정하여 쉽게 산화되는데 이러한 ascorbic acid의 산화를 억제하기 위해 리포좀에 순수한 ascorbic acid를 봉입시켜 안정한 리포좀을 제조하였다. 안정한 리포좀의 제조를 위해 cholesterol이나 β-sitosterol이 리포좀의 안정화에 미치는 영향을 측정하였으며 ascorbic acid의 산화방지를 위해 항산화제로 butylated hydroxytoluene(BHT), tertiary butylhydroquinone(TBHQ)와 α-glycosyl rutin, natural concentrated tocopherol을 사용하였다. 리포좀 제조시 cholesterol이나 β-sitosterol을 사용한 경우 ascorbic acid의 산화가 감소하였는데 이는 cholesterol이나 β-sitosterol이 리포좀의 이중막을 강화하여 봉입한 ascorbic acid의 방출을 감소시켜 산화를 방지하는 것으로 생각된다. 또한 cholesterol의 농도가 0.3%인 경우 가장 안정한 리포좀이 생성됨을 알 수 있었다. 사용된 항산화제는 ascorbic acid에 대하여 모두 산화억 제효과를 나타내었으며 tertiary butylhydroquinone, α-glycosyl rutin, butylated hydroxytoluene, natural concentrated tocopherol 순으로 우수함을 보였다. 그러나 제약 및 화장품에 사용되는 ascorbic acid의 산화억제에는 효과가 가장 좋은 합성 항산화제인 tertiary butylhydroquinone보다 천연물질에서 추출한 항산화제인 a-glycosyl rutin이 더 적합할 것으로 생각된다. Ascorbic acid which has various physiological benefits as the functional substance is easily oxidized and destroyed by the structural instability. Liposome encapsulated pure ascorbic acid was prepared for the sake of the constraint of oxidation. The influence of cholestrol or β-sitosterol on the stabilization of liposome was investigated. Butylated hydroxytoluene(BHT), tertiary butylhydroquinone(TBHQ), α-glycosyl rutin and natural concentrated tocopherol were used for constraint of oxidation of ascorbic acid. The presence of cholesterol or -sitosterol decreased oxidation of ascorbic acid. That results were thought that cholesterol or β-sitosterol so increased rigidity of bilayer that the leakage of vitamin C decreased. As a result, the oxidation and degradation of vitamin C were constrained. At 0.3w/w% cholesterol content the most stable liposome was formulated. The whole antioxidant that used at the research constrained oxidation of ascorbic acid. The antioxidation for ascorbic acid increased in order of tertiary butylhydroquinone, α-glycosyl rutin, butylated hydroxytoluene and natural concentrated tocopherol. But α-glycosyl rutin is preferable to tertiary butylhydroquinone which was the most effective in antioxidation as the antioxidant of ascorbic acid which was utilized in cosmetics and pharmacy.
조리실습과목의 비대면 온라인수업에 따른 조리전공 대학생의 주관성 연구 –구글 클래스룸 활용 중심-
이강연(Kang-Yeon Lee),김찬우(Chan-Woo Kim) 한국콘텐츠학회 2021 한국콘텐츠학회논문지 Vol.21 No.4
본 연구의 목적은 조리실무과목에 구글 클래스룸(Google Classroom)을 활용하여 현재 교육환경과 여건에 맞는 실무적 수업운영 방식을 제시하여 추후 실무과목에서의 비대면 수업이 진행 될 경우 전공핵심역량 및 실무능력을 배양하고자 한다. 또한 현재 교육과정을 경험하고 있는 수혜자인 조리전공 학생들을 대상으로 주관적 의견이나 인식 구조를 분석하여 유형별로 추출이 가능한 Q방법론을 적용하여 그 특성과 함의를 분석하고자 한다. 조사기간은 2020년 3월23일부터 4월 30일까지 조리실습과목을 수강하고 있는 조리전공 1학년을 대상으로 진행되었으며, 1유형(N=11) : 조리실습 키드(kit)개발(Development of cooking training kit), 제 2유형(N=7) : 산업체 전문가 특강 요구 (Special lectures from industry experts), 제 3유형(N=7) : 실습형 자기주도학습 개발 유형(Development of practice form self-directed learning)으로 각각 도출되었다. 본 연구를 기반으로 조리실습과목 운영에 대한 교육과정 개발, 교육효과 및 학습법 적용에 관한 주관적 인식 연구에 의미 있는 자료로 기여할 것으로 기대한다. The purpose of this study was to use Google Classroom for Cooking Practice Subject. We would like to present a practice class operation method suitable for the current educational environment and conditions. If the Untact Class in the Practice Subject is conducted in the future, we want to cultivate the core competencies and practical skills of the major. In addition, Q Methodology, which can be extracted by type, was applied by analyzing subjective opinions or perception structures for the cooking major students who are currently experiencing the curriculum. The survey period was conducted from March 23 to April 30, 2020 for first-year Cooking Major students taking the Cooking Practice Subject. Type 1 (N=11): Development of cooking training kit, Type 2 ( N=7): Special lectures from industry experts, Type 3 (N=7): Development of practice form self-directed learning, respectively. Based on this study, it is expected to contribute to the Q Methodology on the development of the curriculum for the operation of the cooking practice subject, the effectiveness of education, and the application of learning methods.
이강연(Kang-Yeon Lee),정병호(Byeong-Ho Jeong),김효진(Hyo-Jin Kim) 한국조명·전기설비학회 2011 조명·전기설비학회논문지 Vol.25 No.11
There are two main types of concentrating optical systems in use today: refractive types that use Fresnel lenses, and reflective systems that use one or more mirrors. Regardless of the chosen optical system, the result is concentrated sunlight being aimed at the sensitive face of the cell, to produce more energy from less photovoltaic material. In this paper, for the achieve trackerless CPV system, CPV module included that the spherical lens with reflect mirror makes it possible to achieve high and stable power generation performance for the high concentration photovoltaic power generation system and cope with the needs for a variety of shapes and sizes in flexible manners and that the multiple cavity assemble method greatly reduces costs. Development of these high performance multi-junction CPV module promises to accelerate growth in photovoltaic power generation.