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정지기 기반 분산형 전원 연계변압기 결선을 고려한 고장해석
윤명석(Myungseok Yoon),이문정(Moonjeong Lee),조남훈(Namhun Cho),최승연(Sungyun Choi) 대한전기학회 2021 전기학회논문지 Vol.70 No.9
For conducting the fault analysis in a system with distributed generation, the sequence equivalent circuit is used. Due to the characteristics of distributed generation that reverse currents occur, the size of the fault current can be determined by the path where fault current can flow into the fault point in the negative sequence and zero sequence. In this paper, we calculate and compare the fault currents in the system with inverter-based distributed generation considering the topology of transformer winding. From the results, we can analyze the effect of the interconnection transformer in the fault analysis.
윤명석(Moung Seok Yoon),정연복(Youn Bok Chung),한건(Kun Han) 한국약제학회 1999 Journal of Pharmaceutical Investigation Vol.29 No.4
Retinoids in anti-wrinkle cosmetics are widely used for the treatment of the photoaging skin these days, but very unstable in the presence of water. Multilamellar liquid crystal vesicles consisted of poly(oxyethylene)_(15)oleyl ether (POE_(15)OE) or poly(oxyethylene)_(15) stearyl ether(POE_(15)SE), cetostearyl alcohol (CSA) and cholesterol or oils were prepared to increase the stability of retinyl acetate or retinyl palmitate. POE_(15)OE-CSA-Water systems were more unstable than POE_(15)SE-CSA-Water systems due to the bended structure of oleyl groups. For the modification of vesicles, cholesterol was added. The enthalpy values were decreased reaching to zero and the water permeability of systems was decreased, but the stabilization of retinyl acetate was not greatly improved. The stability of retinyl acetate may depend on its location in the structure. Various oils were added for further stabilization and isopropyl myristate was most effective. In practice, retinyl palmitate showed better stability in the same vesicle than retinyl acetate, and the improved vesicles could be used for the anti-wrinkle cosmetics