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BESS를 적용한 계통연계형 PV시스템의 운전특성에 관한 연구
이강연(Lee Kang-Yeon),정병호(Jeong Byeong-Ho),조금배(Cho Geum-Bae),백형래(Baek Hyung-Lae),정해덕(Jung Hae-Duck) 한국태양에너지학회 2006 한국태양에너지학회 논문집 Vol.26 No.2
Photovoltaic is an attractive technology to remote power applications, because of its reliability, low maintenance, and zero fuel requirements.<br/> In this paper represents residential PV system based on BESS(battery energy storage system) for managing the electric power, a pattern of daily operation considering the load characteristics of the house, the generation characteristics of PV power, and utility power leveling. For apply to control algorithm, we consider the load on monthly power consumption trend and daily usage pattern. As for the control of the proposed system, to increase the conversion efficiency of the PV power, bidirectional converter is used for MPPT and SPWM inverter. An experimental system is implemented, and some experimental results are provided to demonstrate the effectiveness of the proposed system.
반추기축영양 : 겨자종자와 겨자분의 첨가가 반추위 발효성상과 메탄생성에 미치는 영향
이강연 ( Kang Yeon Lee ),김경훈 ( Kyoung Hoon Kim ),백열창 ( Youl Chang Back ),옥지운 ( Ji Un Ok ),설용주 ( Yong Joo Seol ),한기준 ( Ki Jun Han ),박근규 ( Keun Kyu Park ),류호태 ( Ho Tae Ryu ),이상석 ( Sang Suk Lee ),전체옥 ( Che 한국동물자원과학회(구 한국축산학회) 2013 한국축산학회지 Vol.55 No.1
본 연구는 allyl isothiocyanate를 함유한 겨자종자와 겨자분을 이용하여 반추위 발효성상과 메탄 배출에 미치는 영향을 알아보고자 실시하였다. 완충용액과 혼합한 반추위액 30ml에 겨자종자와 겨자분을 첨가하여 39℃에서 6, 12, 그리고 24시간 동안 배양하였다. 겨자종자와 겨자분은 각각 0, 3.33, 5.00, 6.67 및 8.34g/L 첨가하였다. 총 가스 생성량은 모든 처리구에서 유의적으로 증가하였다(P<0.01). 메탄 배출량은 겨자종자를 6.67g/L 및 8.34g/L 첨가하였을 때 각각 4.77% 및 11.54% 감소하였다(P<0.05). 겨자분에서는 배양 6시간에 8.34g/L를 첨가하였을 때를 제외하고 효과가 나타나지 않았다. 반추위 발효성상에 있어, pH는 대조구와 비교하여 모든 처리구에서 낮게 나타났다(P<0.01). 암모니아의 농도는 첨가량이 증가할수록 유의적으로 증가하였다(P<0.01). 총 휘발성 지방산 농도는 모든 처리구가 대조구보다 높았다(P<0.05). 대조구와 비교하여 acetate의 농도는 감소하였고, propionate의 농도는 증가하였다(P<0.05). Acetate와 propionate 변화로 인해 A:P ratio 역시 감소하였다(P<0.05). 본 시험 결과로 보아, allyl iso- thiocyanate를 함유한 겨자종자를 첨가하였을 때 반추위 발효성상에 영향을 미치지 않고 메탄 생성량을 감소시킬 수 있을 것으로 생각된다. The purpose of this study was to investigate the effects of mustard, which contains allyl isothiocyanate, on ruminal fermentation and methane emission in vitro. To this end, diluted ruminal fluid(30ml) was incubated anaerobically at 39℃ for 6, 12, and 24h with or without seeds or powdered mustard. Either mustard seed or powdered mustard was weighed and serially(0, 3.33, 5.00, 6.67, and 8.33g/L) mixed with ruminal fluid. Ammonia-N was increased(P<0.05) by mustard treatment in a dose dependent manner. Regardless of concentration or form, mustard increased(P<0.05) total VFA content but decreased(P<0.01) pH compared to control group. Molar proportion of acetate(A) was decreased (P<0.05) whereas propionate(P) was increased(P< 0.05) by mustard treatment, thereby A:P ratio was decreased(P<0.05) compared to control group. Total gas production was increased(P<0.01) in a linear manner by mustard treatment compared to control group. There was no effect of mustard powder, except 8.33g/L level at 6h, on methane emission. However, at 24h, methane emission was reduced(P<0.05) by 4.77% and 11.54% with 6.67g/L and 8.33g/L of mustard seeds supplementation, respectively. Altogether, these results suggest that mustard seeds containing allyl isothiocyanate may reduce methane production without disturbing ruminal fermentation.
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.