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入力電流의 高調波 低減을 위한 새로운 다이리스터 整流回路의 개발
柳喆魯,金聖中,李公熙,李星龍,高榮浩 全北大學校 1987 論文集 Vol.29 No.-
The harmonics involved in input AC line currents of thyristor rectifier apparatus have recently been a serious problem in the cause of burning power condenser, mis-action of UFR(protective relay), and trouble of the automatic voltage controller, etc, in the sending or distribution electric power system. As an effective counter-measure for this, the method of having switching taps on the conventional interphase reactor and its artificial utilization have been adapted, as we know. The conventional 3 tap method, however, is not achieved an effect of reducing harmonics under firing angle 15˚. In this paper, a new method of reducing harmonics involved in input AC line currents or output DC voltage of rectifier circuit is presented, which is due mainly to the equipment of the 2-3 switching taps on interphase reactor. Thereofre, main contents of this study are the following three items; 1) optimal number of taps 2) optimal turn ratio of interphase reactor 3) optimal control angle of interphase reactor.
Sung-Ryong Ko,Kang-Ju Choi,Byung-Goo Cho,Kil-Bong Nho,Seok-Chang Kim,Byeong-Seon Jeon and Chun-Suk 고려인삼학회 2005 Journal of Ginseng Research Vol.29 No.3
Ginseng saponins have been known as main active principles and are quantified as the index components of ginseng and its products for quality control. However ginseng saponins are easily hydrolyzed in acidic solutions of crude drug preparations. Due to the hydrolysis of saponins in acidic condition, it is generally difficult to determine ginseng saponins in crude drug preparations. Ginseng saponins, prosapogenins and sapogenins of crude drug extracts were quantified by HPLC. Ginseng saponins were quantified by HPLC on Lichrosorb-NH₂ column with acetonitrile/water/1-butanol(80:20:10, v/v). Ginseng prosapogenin-Rg₃ and -Rg₂ were extracted with ethyl acetate from 50% acetic acid hydrolyzates of saponin fractions and quantified by HPLC on Lichrosorb-NH₂ column with acetonitrile/water(90:10, v/v). Ginseng sapogenins, panaxadiol and panaxatriol, were extracted with diethyl ether from 7%-sulfuric acid hydrolyzates of saponin fractions and quantified by HPLC on μ-Bondapak C18 column with acetonitrile/methanol/chloroform(83:10:7, v/v). These methods of analyses of sapogenins and prosapogenins were more useful for quality control than those of ginseng saponins in some of crude drug preparations.
Ko, Sung-Ryong,Choi, Kang-Ju,Cho, Byung-Goo,Nho, Kil-Bong,Kim, Seok-Chang,Jeon, Byeong-Seon,Kim, Chun-Suk The Korean Society of Ginseng 2005 Journal of Ginseng Research Vol.29 No.3
Ginseng saponins have been known as main active principles and are quantified as the index components of ginseng and its products for quality control. However ginseng saponins are easily hydrolyzed in acidic solutions of crude drug preparations. Due to the hydrolysis of saponins in acidic condition, it is generally difficult to determine ginseng saponins In crude drug preparations. Ginseng saponins, prosapogenins and sapogenins of crude drug extracts were quantified by HPLC. Ginseng saponins were quantified by HPLC on $Lichrosorb-NH_2$ column with acetonitrile/water/1-butanol(80:20:10, v/v). Ginseng $prosapogenin-Rg_2$ and $-Rg_2$ were extracted with ethyl acetate from $50\%$ acetic acid hydrolyzates of saponin fractions and quantified by HPLC on $Lichrosorb-NH_2$ column with acetonitrile/water(90:10, v/v). Ginseng sapogenins, panafadiol and panaxatriol, were extracted with diethyl ether from $7\%-sulfuric$ acid hydrolyzates of saponin fractions and quantified by HPLC on ${\mu}-Bondapak\;C_{18}$ column with acetonitrile/methano1/chloroform(83:10:7, v/v). These methods of analyses of sapogenins and prosapogenins were more useful for quality control than those of ginseng saponins in some of crude drug preparations.
高晟勳(Sung-Hun Ko),林成勳(Sung-Hun Lim),李洙原(Su-won Lee),李星龍(Seong-Ryong Lee) 대한전기학회 2007 전기학회논문지 Vol.56 No.6
This paper presents a grid-interactive current controlled voltage source inverter (CCVSI) with uniterruptible power supply (UPS), which uses an inner current control loop (polarized ramp time (PRT)) and outer feedback control loops to improve grid power quality and UPS. To reduce the complexity, cost and number of power conversions, which results in higher efficiency, a single stage CCVSI is used. The operation of this system could be divided into the power quality control (PQC) state mode and the UPS state mode. In PQC mode, the system operated to compensate the reactive power demand by nonlinear load or variation in load. In UPS mode. the system is controlled to provide a sinusoidal voltage at the rated value for the load when the gird fail. To verify the proposed system, a comprehensive evaluation with theoretical analysis, simulation and experimental results for 1KVA load capacity is presented.
백삼류의 Crude Saponin 및 Ginsenosides함량
고성룡(Sung Ryong Ko),최강주(Kang Ju Choi),김석창(Seok Chang Kim),김만욱(Man Wook Kim) 한국생약학회 1989 생약학회지 Vol.20 No.3
Crude sponin and ginsenosides in commercial white ginsengs such as six kinds of whole ginsengs, five kinds of tail roots and one undergrade raw ginseng were analyzed. The contents of crude saponin and ginsenosides in whole ginsengs were found to be 2.7 to 4.6% and 1.0 to 1.7%, respectively. On the other hand, those of tail roots were 3.3 to 7.2% and 1.3 to 4.4%, respectively. The content ratio of PD to PT saponin in whole ginsengs showed a little variation as 0. 73 to 0. 92, while those of tail roots showed a greater variation in the range of 0.72 to 1.75, indicating that tail roots contain higher content of PD saponin than whole ginsengs did.
중범위 전층 회전근 개 파열에서 광범위 근개 봉합법을 이용한 관절경 하 봉합술
고상훈(Sang-Hun Ko),조성도(Sung-Do Cho),정광환(Kwang-Hwan Jung),차재룡(Jae-Ryong Cha),염윤석(Yoon-Seok Youm),정창윤(Chang-Yun Jung),서동교(Jae-Ryong Cha),전형민(Hyung-Min Jeon),이채칠(Chae-Chil Lee) 대한정형외과학회 2008 대한정형외과학회지 Vol.43 No.1
목적: 중범위의 회전근 개 전층 파열에 대해서 관절경 하의 변형된 Mason-Allen 방법을 이용한 massive cuff stitch (MCS, 광범위 근개 봉합)의 유용성과 임상적 결과 및 단기 추시 후 봉합의 연속성을 평가하고자 한다. 대상 및 방법: 2004년 12월부터 2005년 5월까지 중범위 회전근 개 전층 파열로 관절경하 봉합술을 시행한 23예를 대상으로 하였으며, 술 전과 6개월, 1년, 마지막 추시 때에 통증에 대한 VAS, ADL (Activity of Daily Living), UCLA 기능평가 점수를 측정하였으며, paired t-test로 비교하였다. 평균 연령은 54 (43-69)세였고 평균 추적기간은 14 (12-17)개월이었다. 술 후 11예에서 MRI를 촬영하여 추적 관찰하였다. 결과: 동통에 대한 VAS점수는 술 전 평균 7.0에서 0.9로 감소하였고(p<0.05), ADL은 술 전 평균 11.1에서 25.9으로(p<0.05), UCLA 기능평가 점수는 평균 13.6에서 32.5로 증가하였으며(p<0.05), 최종 추시에서 우수, 우량이 91.3%였으며, 1예를 제외한 23예(95.7%) 환자에서 만족하였다. MRI를 이용한 봉합의 연속성 평가에서는 1예(9.1%)에서 재파열이 있었다. 결론: 중범위 회전근 개 전층 파열에서 관절경 하의 변형된 Mason-Allen 봉합법을 두 겹으로 이용한 massive cuff stitch (MCS, 광범위 근개 봉합)는 증상의 호전과 기능 향상을 가져온다고 생각된다. Purpose: We wanted to evaluate the usefulness of arthroscopic repair using the modified Mason-Allen Massive Cuff Stitch for medium sized full thickness rotator cuff tear. We verified the clinical results and evaluated the repair integrity after short term follow up. Materials and Methods: Twenty-three cases of arthroscopically repaired full thickness tear of the rotator cuff of an estimated medium size were evaluated between December 2004 to May 2005. The average patient age was 54 years old (range: 43-69 years old), and the mean follow-up was 14 months (range: 12-17 months). We analyzed the results by paired t-test. The follow up MRIs were checked in 11 cases. Results: The VAS pain score was improved from a preoperative average of 7.0 to a postoperative average of 0.9, the ADL was improved from 11.1 to 26.0 and the UCLA score was improved from 13.6 to 32.5 (all p<0.05). 91.3% showed an excellent or good result at the final follow-up. The satisfied rate was 95.7% (22 cases). There was re-rupture of the repaired rotator cuff in one out of 11 cases (9.1%). Conclusion: Arthroscopic repairs using a modified Mason-Allen Massive Cuff Stitch for full thickness rotator cuff tear of an estimated medium size showed good clinical outcomes.
전압제어형 VSI를 적용한 계통연계형 분산전원시스템의 설계
박천성(Chun-Sung Park),조성필(sung-Phil Cho),고성훈(Sung-Hun Ko),이수원(Su-Won Lee),전칠환(Chil-Hwan Jeon),이성룡(Seong-Ryong Lee) 대한전기학회 2008 대한전기학회 학술대회 논문집 Vol.2008 No.4
본 논문에서는 산간벽지 또는 낙도와 같이 중앙계통으로부터 송 · 배전선을 이용한 전력공급이 어려운 약 계통(Weak grid)에 주로 사용되는 계통연계형 분산전원시스템의 설계 방법을 설명한다. Weak grid에서는 계통의 전압변동의 폭이 매우 크기 때문에 부하에 안정적으로 정전압을 공급할 수 있는 전압제어형 전압원 인버터(VCVSI: Voltage-Controlled Voltage Source Inverter)를 주로 사용한다. 따라서 본 연구에서는 계통의 전압에 변동에 따른 각각의 시스템 파라미터 특성을 분석하고 이에 따른 최적의 시스템 용량의 선정방법을 제시한다.