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한기원(Ki Won Han),이수원(Soo Won Lee),한광수(Koang Soo Han),이대진(Dae Jin Lee),이병의(Byung Eui Lee),장원철(Won Cheoul Jang) 한국독성학회 2003 Toxicological Research Vol.19 No.2
We investigated antitumor activities of the ethanol extract from mushroom Phellinus linteus and Phellinus baumii on mulberry, oak and elm. In vitro test, the ethanol extract of mushroom cultivated on oak of Phellinus linteus showed highest activities about SK-OV-3, HCT15, XF498, SKMEL-2 and A549. SK-OV-3 cell line showed 100% cytotoxicity in 100 mg/ml and HCT15 (98.39%), XF498 (89.62%), SK-MEL-2 (84.07%) and A549 (79.92%) cytotoxicity respectively. Also IC50 showed 3.99 ㎍/ml to SK-OV-3 cell line and HCT15 (4.37 ㎍/ml), A549 (5.48 ㎍/ml), SK-MEL-2 (6.72 ㎍/ml), XF 498 (6.88 ㎍/ml). As those results, cultivated oak of Phellinus linteus showed a very low IC50 value against SK-OV-3, HCT15, XF498, SK-MEL-2 and A549 cancer cell lines.
한기봉(Han,Ki-bong),한태희(Han,Tae-hee),이신원(Lee, Shin-Won),한승우(Han, Seung-wo) 한국태양에너지학회 2012 한국태양에너지학회 논문집 Vol.32 No.6
The existing solar tracking sensor for 2 axial control system to trace latitude and longitude is made of four phototransistor.The phototransistor-making is difficult and it" smanufacturing is more high-priced than a wide use phototransistor because they have to the same characteristics of each phototransistor output signal. This paper described the algorithm for supplement these weakness. The algorithm applied to signal normalizing method and vector decomposition law. The deviations of each a wide use phototransistor output signal are resolved by signal normalizing method and itis able to make a solartracking sensor using three phototransistor by vector decomposition law. Therefore, in this paper,it is reduced the number of phototransistor that is composed of solar tracking sensor and possible to use a wide use phototransistor by the proposed algorithm.
한기봉(Ki-Bong Han),강인준(In-Joon Kang),최치영(Chi-Young Choi),이경철(Kyung Chul Lee),이수주(Soo-Ju Lee) 대한공간정보학회 2009 한국지형공간정보학회 학술대회 Vol.2009 No.4
삼국시대부터 축조되어 전해지는 봉수대는 조선시대에 이르러 크게 발전되어 국방 및 통신 분야에서 중요한 역할을 해왔다. 이러한 봉수대의 선정에 있어서 지형, 지세, 기후 및 산림 등의 자연조건은 중요한 기준이 되었다. 본 연구에서는 부산지역에 위치하는 봉수대 중 연변 봉수대에 대하여 봉수대의 입지를 선정하는 요소들 중 지형과 기후요소를 중심으로 하여 기후요소 중에서 봉수대가 위치하는 연구지역의 운량 및 시정거리의 지수의 연간의 평균결과 값을 산출하여 보았고 봉수대 지형요소에 대한 분석으로 경사(slope), 향(aspect)등을 파악해보고 각 봉수대간의 거리 및 가시권(Visible range)를 파악하여 봉수대의 입지에 대한 특징을 수치적으로 정리해 보고 이들 요소들을 대상으로 통계분석을 실시하여 각 요소들 사이의 상관관계 결과를 바탕으로 미지(未知)의 봉수대의 파악에 있어서의 효율성을 가지는지에 대하여 알아보았다.
백하수오(白何首烏)의 항산화활성(抗酸化活性)과 amino acid의 분포(分布)에 관한 실험적(實驗的) 연구(硏究)
한기선,신길조,이원철,이종형,Han Ki-Sun,Shin Gil-Jo,Lee Won-Chul,Lee Jong-Hyung 대한한방내과학회 1998 大韓韓方內科學會誌 Vol.19 No.2
The aim of the presents study is to investigate and compare the antioxidative effects and qualities of the cultivating root of Cynanchum Wilfori, which is increasingly used in recent days, with those of the wilding root, which has mainly been used in the past in oriental medicine for a tonic and also for prevention and treatment of various geriatric diseases including aging progress. For comparison of their antioxidative effects, the activities of the total extracts on lipid peroxidation and the activity of aldehyde oxidase(EC 1.2.3.1) as well as xanthine oxidase(EC 1.2.3.2) were investigated in vitro. In addition, their inhibitory effects on the activity of 5-lipoxygenase, which is known to induce inflammation and concerned with free radicals, were also determined in vitro. Furthermore, the amino acid contents of both roots were analyzed in order to compare their qualities. The results are as follows: 1. The wilding root inhibited significantly the activity of 5-lipoxygenase, showing five times more portent than the cultivating root. 2. Both of the wilding root and the cultivating root inhibited aldehyde oxidase activity in a dose-dependant manner. The wilding root was more effective than the other. 3. Both of the wilding root and the cultivating root dose-dependently suppressed lipid peroxidation in rat brain, kidney, and liver. 4. The anti-peroxidative effects of both roots appeared to be most strong in brain and least in liver. In particular, the cultivating root exhibited a significant inhibition on brain lipid peroxidation. 5. The cultivating root contained 15 amino acids including five essential amino acids in contrast with the less contents in the wilding root.
한기선(Ki-Son Han),권동진(Dong-Jin Kweon),구교선(Kyo-Sun Koo),이병성(Byung-Sung Lee),송길목(Kil-Mok Shong) 한국조명·전기설비학회 2011 한국조명·전기설비학회 학술대회논문집 Vol.2011 No.5월
Mineral oil is the most widely used to insulation material of transformer because of the long experience and low cost. Although mineral oil has many advantages, it posses fire hazard when it use in the buildings. Thirty years ago, fire resistant hydrocarbon fluids and mold transformer were developed such as PCBs, Silicone oil, HMWH and Cast resin transformer. Cast resin transformer is widely used in the almost buildings in Korea. Recently, the application of ester fluids have been reported. This paper compares to advantages and disadvantages of the cast resin and ester fluid transformers.
100 gm 경구 당부하검사 결과 하나만 비정상을 보인 임신의 양상
한기수(Ki Su Han),양성천(Seong Cheon Yang),김행수(Haeng Soo Kim),양정인(Jeong In Yang),이희종(Hee Jong Lee),임재현(Jae Hyun Lim),임윤경(Yun Kyoung Lim),오기석(Kie Suk Oh) 대한산부인과학회 2001 Obstetrics & Gynecology Science Vol.44 No.10
N/A Objective : To evaluate the clinical outcomes of pregnancies showing one abnormal glucose tolerance test value. Method : We performed 50 gm glucose challenge test in 5,019 pregnant women at 24-28 weeks of gestation. In 1,170 women with plasma glucose levels over 130 mg/dL, 100 gm oral glucose tolerance tests (OGTTs) were performed at 28-32 weeks of gestation. In the 888 cases who were followed up, according to the National Diabetes Data Group (NDDG) criteria, 122 cases with one abnormal 100 gm OGTT value were divided into three groups (groups 1, 2, 3 : abnormal value after 1, 2, 3 hours, respectively). These were compared with 577 cases (control group) with normal 100 gm OGTT value, retrospectively. Result : The incidence of one abnormal glucose tolerance test value was 2.6%, and there were no cases where the fasting plasma glucose level only was elevated. The incidence (control, group 1, group 2, group 3 : 19.4%, 43.8%, 25.7%, 29.6%) of poor maternal outcomes which contain any one of preeclampsia, hydramnios, cesarean delivery for cephalopelvic disproportion or failure to progress or fetal distress was highest in group 1 (p=0.025). The incidence (15.8%, 43.1%, 14.3%, 21.1%) of poor perinatal outcomes which contain any one of fetal distress, Apgar score of 5 minute < 7, hypoglycemia, respiratory distress syndrome, small for gestational age, perinatal death was also highest in group 1 (p=0.009). Logistic regression analysis for poor maternal outcomes showed odds ratio of 2.83 (95% confidence interval 1.02-7.87) in group 1 and 2.08 (95% confidence interval 1.22-3.55) in group 3, and for poor perinatal outcomes odds ratio of 4.24 (95% confidence interval 1.02-17.52) in group 1 and 3.30 (95% confidence interval 1.45- 7.48) in group 3. Conclusion : Pregnancies complicated with one abnormal glucose tolerance test value, particularly the group showing abnormal glucose tolerance test value after 1 or 3 hour exhibited adverse maternal and perinatal outcomes.