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디지털 위상검출기법을 적용한 능동적 주파수 변화 정궤환기법
이기옥,정영석,최주엽,최익,송승호,고문주 한국태양에너지학회 2007 한국태양에너지학회 논문집 Vol.27 No.2
As photovoltaic(PV) power generation system becomes more common, it will be necessary to investigate islanding detection method for PV systems. Islanding of PV systems can cause a variety of problems and must be prevented. However, if the real and reactive power of the load and PV system are closely matched, islanding detection by passive methods becomes difficult. Also, most active methods lose effectiveness when there are several PV systems feeding the same island. The active frequency drift positive feedback method(AFDPF) enables islanding detection by forcing the frequency of the voltage in the island to drift up or down. In this paper the research for the minimum value of chopping fraction gain applied digital phase-locked-loop (DPLL) to AFDPF considering output power quality and islanding prevention performance are performed by simulation and experiment according to IEEE Std 929-2000 islanding test.
쥐의 tyrosine 결핍이 갑상선호르몬 함량에 미치는 효과
이기옥,최혜미 ( Ki Ock Lee,Hay Mie Choi ) 생화학분자생물학회 1983 BMB Reports Vol.16 No.4
Pregnant Sprague Dawley rats were fed a tyrosine deficient diet (tyrosine 0.00 %) : Def. I group started from delivery, Def. II from the 8th day of gestation, and compared with the control (tyrosine 0. 36 %) until the 5th week of postnatal period. Offspring rats from these groups were analyzed for serum T₃ and T₄. The serum T₃ and T₄ levels of def. I group were higher than those of control. The serum T₄ level of Def. II group were similar to that of the control at 2nd and 3rd week of postnatal period, and then it was rapidly increased to surpass to control level. However, dietary tyrosine deficiency significantly reduced serum tyrosine level at all ages. When considering overall developmental pattern, the serum T₃ and T₄ levels of all groups increased and serum tyrosine levels increased transiently at 2nd week and then decreased.
작약감초탕(芍藥甘草湯) 및 구성약물(構成藥物)이 진통(鎭痛)에 미치는 영향(影響)
이기옥,국윤범,윤용갑,Lee Ki-Ok,Kuk Yun-Beum,Yun Young-Gab 대한한의학방제학회 2003 大韓韓醫學方劑學會誌 Vol.11 No.1
This study was designed to elucidate the analgesic effects of Jakyakgamchotang and Radix paeinia, Radix Glycyrrhiziae which are the component of Jakyakgamchotang in mice. The analgesic effects were measured by the Whittle's method and hot plate method. The results were as follows ; After the administration of Jakyakgamchotang extrace, the frequency of writhing syndrome was significantly inhibited. After the administration of Radix paeinia extract, the frequency of writhing syndrome was significantly inhibited. After the administration of Radix Glycyrrhiziae extract, the frequency of writhing syndrome was significantly inhibited. After the administration of Jakyakgamchotang extrace, paw licking time and escape time were significantly prolonged. After the administration of Radix paeinia extract, paw licking time was significantly prolonged. After the administration of Radix Glycyrrhiziae extract, paw licking time was significantly prolonged. It is concluded that the analgesic effects of Jakyakgamchotang were found to be more effective than Radix paeinia and Radix Glycyrrhiziae.