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잠재가격에 의한 모선별 고조파전압제약을 고려한 고조파 저감기법에 관한 연구
이범,김용하,최상규,이재걸,연준희,Lee, Bum,Kim, Yong-Ha,Choi, Sang-Kyu,Lee, Jae-Geol,Yeon, Jun-Hee 한국조명전기설비학회 2003 조명·전기설비학회논문지 Vol.17 No.4
본 연구는 잠재가격을 사용하여 고조파를 효과적으로 저감시키는 새로운 방법을 제시한다. 우선, 고조파를 효과적으로 저감시키기 위하여 각 모선에 잠재가격을 적용하였으며, 전력수전점과 각 모선에서의 고조파한계치 이내로 고조파를 저감시킬 수 있는 새로운 알고리즘을 개발하였다. 그 결과, 배전계통에서 경제적으로 필터의 크기와 위치를 결정할 수 있도록 하였다. 제안한 방법을 실제계통에 적용하고, 그 유용성을 검증하였다. This paper presents a new harmonics reduction methodology using shadow price. First, we employed shadow price of each bus to reduce harmonics effectively. Second, we developed a new algorithm which can reduce harmonics under limits at PCC and each bus. As a result economical design of filters and its location of the distribution system is possible. This method is applied to the real system, and the usefulness of the method is verified.
큰입우럭(Micropterus salmoides) 조직의 젖산탈수소효소 및 Monocarboxylate 수송체(MCT) 1, 2, 4
Jung Joo Yum(염정주),Jun Hee Yeon(연준희) 한국생명과학회 2012 생명과학회지 Vol.22 No.1
큰입우럭(Micropterus salmoides) 조직의 젖산탈수소효소(EC 1.1.1.27, LDH)의 특성 및 골격근과 심장조직의 monocarboxylate 수송체 1, 2, 4의 발현을 연구하였다. Native-PAGE 결과골격근에서 LDH A₄, 심장, 간, 눈 및 뇌조직에서 A₄, A₂B₂, B₄, 눈조직에서 eye-specific C₄ 동위효소가 발현되었다. 9월에 심장조직에서 LDH B₄ 동위효소의 활성이 강하고 다른 조직에서는 A₄의 활성이 강했으나, 11월에 심장조직에서 A₄ 동위효소의 활성이 강하게 확인되었다. 골격근과 심장조직에서 LDH/CS로 조직의 혐기적 대사 비율이 높게 확인되었으며, 면역 침강 후 native-PAGE에 의해 LDH eye-specific C₄ 동위효소가 B4보다 A₄ 동위효소에 더 유사한 것으로 확인되었다. LDH A₄ 동위효소가 affinity chromatography에 의해 정제되었고, 하부단위체 A의 분자량은 37.200이었다. 피루브산 10 mM에서 조직 LDH의 활성이 11.05-28.32% 남아 저해 정도가 컸고, 눈조직 LDH의 Km <SUP>PYR</SUP>이 낮았으며, 조직의 최적 pH는 7.5~8.0이였다. 골격근 미토콘드리아에서 LDH A₄ 동위효소, 심장조직의 미토콘드리아에서 B₄와 A₂B₂ 동위효소가 확인되었고, 골격근과 심장조직의 원형질막과 미토콘드리아에서 MCT 1, 2, 4가 확인되었다. 골격근 MCT 1, 2, 4 골격근 MCT 1 60 kDa, MCT 2 54~38 kDa, MCT 4 63 kDa, 심장조직 MCT 1 57 kDa, MCT 2 54~38kDa 및 MCT 4 55.5 kDa이었다. 실험 결과, 큰입우럭이 저산소 조건에 적응되어져 혐기적 대사가 우세하고, 활성이 큰 골격근과 심장조직에서 원형질막과 미토콘드리아 MCT 1, 2, 4를 통해 젖산과 피루브산이 유입되고 유출되며 LDH에 의해 에너지 생성을 효율적으로 조정하는 것으로 사료된다. The properties of lactate dehydrogenase (EC 1.1.1.27, LDH) and expression of monocarboxylate transporters (MCTs) 1, 2, and 4 were studied in tissues from Micropterus salmoides. Native-PAGE revealed that the LDH A₄ isozyme was predominantly located in skeletal muscle. The LDH A₄, A₂B₂, and B₄ isozymes were detected in heart, liver, eye, and brain tissues, while eye-specific C₄ isozyme was detected in eye tissue. In September, strong LDH B₄ isozyme activity was detected in heart tissue. High A₄ isozyme activity was noted in all other tissues except heart tissue. However, in November, strong A₄ isozyme activity was detected in heart tissue. The LDH/CS (Citrate synthase, EC 4.1.3.7) ratio in skeletal muscle and heart tissues indicated that anaerobic metabolism was high in those tissues. Native-PAGE after immunoprecipitation showed that eye-specific C₄ isozyme was more similar to the A₄ than the B₄ isozyme. The LDH A₄ isozyme was purified by affinity chromatography. The molecular weight of subunit A was 37,200. The LDH activity in tissues was consistently 11.05~28.32% due to inhibition by 10 mM pyruvate. The Km <SUP>PYR</SUP> of LDH in eye tissue was very low. The optimum pH for LDH in tissues was pH 7.5~8.0. The LDH A₄ isozyme was detected in mitochondria of skeletal muscle, whereas the B₄ and A₂B₂ isozymes were detected in heart tissue mitochondria. Western blot analysis indicated that MCTs 1, 2, and 4 were located in the plasma membrane and mitochondria of skeletal muscle and heart tissues. The sizes of MCTs 1, 2, and 4 in skeletal muscle were 60, 54~38, and 63 kDa, while those in heart tissue were 57, 54~38, and 55.5 kDa, respectively. In conclusion, M. salmoides appears to use anaerobic metabolism predominantly when adapted to a hypoxic environment. In highly activated skeletal muscle and heart tissue, energy production is controlled by inward and outward flows of pyruvate and lactate through MCTs 1, 2, and 4 in the plasma membrane and mitochondria, with effective adjustment by LDH isozymes.
FRP Rods로 보강한 콘크리트 보의 전단 내하력의 평가
최익창(IK-CHANG CHOI),연준희(JUN-HEE YEON),고재용(JAE-YONG KO) 한국해양공학회 2004 韓國海洋工學會誌 Vol.18 No.1
The purpose of this study is to estimate the contribution of concrete and shear reinforcement, in shear carrying capacity, on concrete beams, reinforced with steel and/or FRP rods. The experimental tests for 12 concrete beams, reinforced with steel and/or FRP rods, are carried out. Experimental parameters includs the mechanical properties of reinforcements in shear and bending and the ratio of shear reinforcement. This study compares the experimental results of shear carrying capacity in concrete beams, reinforced with steel and/or FRP rods, with the proposed equations. According to the experimental results, the effect of the concrete in concrete beams reinforced with FRP rods is decreased with decreasing Young's modulus of lon gitudinal tensile reinforcement. This results from the large deflection of concrete beams reinforced with decreasing Young's modulus of longitudinai tensile reinforcement. Also, the contribution of shear reinforcement is smaller than the calculated value, using the truss analogy. This results from the fact that the stress redistribution is not exhibited after the break of shear reinforcement.
김용하(Yong-Ha Kim),우성민(Sung-Min Woo),문정호(Jung-ho Moon),연준희(Jun-hee Yeon),박창규(Chang-hyu Park),김영길(Young-gil Kim),이해일(Hae-il Lee) 대한전기학회 2009 대한전기학회 학술대회 논문집 Vol.2009 No.7
A common approach to estimate long-term electric expansion plan used WASP package in Korea. But, this has a little problem for making input DG(Distributed Generation) data computer. This paper develops new program that take complementary measures for DG. Also, it is verified that this package can evaluate availability from the case studies. When this program cooperate with WASP, calculate good results creating long-term electric expansion plan.
김용하(Yong-ha Kim),나인규(In-gyu Na),연준희(Jun-hee Yeon),우성민(Sung-min Woo),김미예(Mi-ye Kim),임현성(Hyun-sung Lim),손승기(Seung-kee Son) 대한전기학회 2006 대한전기학회 학술대회 논문집 Vol.2006 No.7
This paper calculates potential area conversing small co-generation generating capacity. Accordingly, power system considering small co-generation analyzes avoided cost compared with the electric supply & demand.