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주택인입구에 설치 가능한 소형전력품질보상장치에 관한 연구
全永秀(Young-Soo Jon),崔俊英(Jun-Young Choi),韓炳文(Byung-Moon Han),韓后錫(Hoo-Sek Han) 대한전기학회 2006 전기학회논문지A Vol.55 No.2
This paper proposes a small low-cost power quality compensator to be installed at the electricity supply inlet of residential customer. The compensator is composed of a single-phase active power filter with a simple controller using analog electronics, which can correct the power factor and damp out the harmonics. The operation and performance of proposed compensator was verified through simulations with PSCAD/EMTDC and experimental works with hardware prototype. The proposed compensator can offer reduction of power loss and improvement of power quality to the residential customer.
김현영(Hyun-Young Kim),전영수(Yeong-Soo Jun),송영옥(Yeong-Ok Song) 한국식품영양과학회 1995 한국식품영양과학회지 Vol.24 No.3
α-토코페롤과 β-카로틴을 강화한 식이가 흰쥐 간의 산화적인 손상을 줄이는 데 미치는 영향을 살펴보기 위하여 국립보건 연구원으로 부터 분양 받은 Sprague-Dawley계 숫쥐 45마리를 9군으로 나누어 식이지방과 항산화제 첨가 유무를 달리한 식이로 12주 동안 사육하였다. 식이지방원으로는 정어리유, 대두유, 그리고 라드를 이용하여 AIN-76 사료조제법에 따라 탄수화물이 총에너지의 65%, 단백질이 15%, 그리고 지방이 20%되게 하였으며 여기에 α-토코페롤과 β-카로틴을 AIN-76에 사용한 양의 각 200%, 그리고 150% 만큼 첨가였다. 간의 MDA와 protein carrbonyl값은 정어리유군에서 가장 높아 고도의 불포화지방을 다량 함유한 식이군의 지방산화가 가장 현저히 일어남을 알 수 있었으며 이에 항산화제를 강화한 식이를 섭취시킨 경우 지방의 산화를 억제하는 효과도 정어리유군에서 가장 현저히 볼 수 있었다. α-토코페롤 강화한 정어리유군에서 MDA의 생성이 대조군에 비해 35%, β-카로틴 첨가군에서는 15%, 그리고 protein carbonyl의 생성은 각각 44%, 32% 감소되었음을 볼 수 있었고 그 감소의 정도는 모두 유의적이었다. 항산화제를 강화한 군의 지방산화 억제효과는 protein carbonyl값의 측정시 더욱 현저하게 볼 수 있어 지방의 산화정도를 측정하는 데 있어서 이 방법이 더 민감함을 알 수 있었다. Cu, Zn-SOD와 catalase의 활성을 측정하여 지방산화에 따른 효소의 손상정도를 살펴보았을 때, 역시 정어리유군에서 효소의 활성이 대두유군이나 라드군에 비해 현저하게 감소되었음을 볼 수 있었고, 여기에 항산화제를 강화시켰을 때 α-토코페롤 첨가군에서는 효소 활성이 높아지는 경향을 볼 수 있었으나 β-카로틴을 첨가한 군에서는 효소의 활성이 더욱 감소하는 반대의 결과가 나타났다. 이러한 현상은 식이에 첨가한 β-카로틴이 소장에서 Vt A로 전환되어 간에 축적되어 나타난 Vt A 독성 때문으로 추측된다. 쥐의 경우 식이로 섭취된 카로틴은 소장 점막에서 비타민 A로 거의 모두 전환된다는 보고 (4)가 있다. The effect of α-tocopherol and β-carotene supplementation on reducing the oxidative damage in the liver of rats were studied. Forty-five male Sprague Dawley aged 4 weeks were randomly assigned to 9 groups of five for the 12 weeks of the study. Nine groups, sardine oil, sardine oil+Vt E, sardine oil+β-carotene, soybean oil, soybean oil+Vt E, soybean oil+β-carotene, lard, lard+Vt E, lard+β-carotene group, were prepared. Sardine oil, soybean oil, or lard was used for dietary fat and 200% of α-tocopherol or 150% of β-carotene was supplemented to each diet. Each diet supplied 65% of total energy as carbohydrate, 15% as protein, and 20% as lipid. The MDA value and protein carbonyl contents of sardine oil group were significantly different (p<0.05) to those of other fat groups indicating that the most severe lipid oxidation occurred in the group fed diet containing highly polyunsaturated fatty acid. When α-tocopherol or β-carotene was supplemented to the sardine oil diet, MDA value (-35%, -15%, respectively) and protein carbonyl content (-44%, -32%, respectively) decreased significantly (p<0.05). Cu, Zn-superoxide dismutase (SOD) and catalase activities of three different sardine oil groups with or without antioxidants were lower than those of soybean oil or lard group. The reducing effect of α-tocopherol on oxidative damage in sardine oil group supplemented with α-tocopherol was noticeable (p<0.05). However the adverse effect of β-carotene was observed. SOD and catalase activities of β-carotene supplemented groups were the lowest among the same fat groups, but the differences were not statistically significant. The possible cause of decreased enzyme activity seemed to be related to the vitamin A(Vt A) toxicity in the liver where retinol converted from dietary β-carotene in the intestinal mucosa was stored.
조주영(Joo Young Cho),박장필(Jang Pil Park),정준(Jun Jeong),변흥열(Heung Yeal Byun),이승은(Seung Eun Lee),전영수(Young Soo Chun),송인석(In Seog Song) 대한소화기학회 1993 대한소화기학회지 Vol.25 No.6
N/A Boerhaave's Syndrome, or spontaneous esophageal rupture, is generally used to designate lesions resulting from intrinsic forces acting upon the esophagus as opposed to trauma. This disease is a rare. condition with high morbidity and mortality. A 47-year-old man was admitted to our hospital due to hematemesis for 1 hour and epigastric pain Esophagoscopic finding shows a well marginated oval shape puched lesion with necrotic tissue on left side of distal esophagus. Esophagograrn shows large, well marginated diverticuloid esophageal rupture. Correction of the perforated esophagus was carried out with primary repair and drainage. We experienced a case of diverticuloid esophageal rupture in a patient with liver dysfunction and hyperglycemia so report it with review of literatures.
변흥열(Heung Yeal Byun),정준(Jun Jeong),이승은(Seung Eun Lee),조주영(Joo Young Cho),전영수(Young Soo Chun) 대한소화기학회 1994 대한소화기학회지 Vol.26 No.2
Y,on-neoplastric cicatrical stenosis of the stomach is an infrequent lesion which may occur as a complication of the recurrent gastric ulcer and ingestion of corrosive agents. This subject should be of general interest to physicians. Since this type of gastric lesion is generally of an obstructive nature and curable only by operative means. A 36 year old man was admitted to our hospital due to epigastric discomfort and intermittent vomiting for 4 months. Gastrofiberscopy and barium study of stomach showed a stenosis from body to antrum. Esophagojenunostomy was carried out and gastric tissues showed variable degree of mucosal and submucosal fit>rosis, chronic ulcer and healed ulcer, healing process of ulcer, and chronic inflammation. We report a case of cicatrical gastric stenosis caused by recurrent gasric ulcer, (Korean J Gastroenterol 1994; 26: 348-352)