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유전체 장벽 방전을 이용한 오존 발생기의 전원장치 최적 설계 및 비교
김봉석,신영철,고광철,Kim, Bong-Seong,Shin, Young-Chul,Ko, Kwang-Cheol 한국전기전자재료학회 2011 전기전자재료학회논문지 Vol.24 No.1
Dielectric Barrier Discharge (DBD) reactor with sinsodual AC type of power supply is very widely adopted for its compact size and effective discharging mechanism to generate high density of ozone radicals. However, at the aspect of design on power supply, its optimal switching conditions and topology is achieved by empirical test. Therefore, throughout this paper, it is proposed a design method of DBD power supply to guarantee a maximum ozone yield rate in accordance with DBD reactor modification and impedance variation when rapid gas discharging in the DBD reactor is proceeded.
이종철(Jong Chul Lee),백승운(Seung Woon Paik),김재준(Jae Jun Kim),고광철(Kwang Cheol Koh),고영혜(Young Hyeh Ko),이화영(Hwa Young Lee),김춘관(Choon Kwan Kim),이풍렬(Poong Lyul Rhee),오영륜(Young Lyun Oh) 대한소화기학회 1997 대한소화기학회지 Vol.30 No.5
Fascioliasis, infection of fasciola sp., is a zoonotic liver disease in human which usually involves the liver and biliary tract. Its occurrence is common in tropical area, western America and in the Mediterranean region, but relatively uncommon in Korea. Fascioliasis is usually presented as multiple small liver abscess and it is extremly uncommon as a single large liver mass. We experienced a case of facioliasis. In an asytnptomatic 43 year-old woman, appearing as a single, large hepatic mass. Imaging study suggested that the rnass is likely to be a hetnangioma, hepatoma or metastatic lesion. We carried out fine needle aspiration of the liver, and its cytology showed only some Fasciola sp. egg. Patients serology to the parasite wasnt available at that time, so we carried out partial hepatic lobectomy to confirm the diagnosis of fascioliasis. We found a parasite granuloma, mummified adult worm of fasciola sp. (Korean J Gastroenterol 1997; 30: 689-694)
이종균(Jong Kyun Lee),이풍렬(Poong Lyul Rhee),이준혁(Joon Hyeok Lee),이규택(Kyu Taek Lee),최성호(Seong Ho Choi),노재형(Jae Hyung Noh),김재준(Jae Jun Kim),고광철(Kwang Cheol Ko),백승운(Seung Woon Paik),이종철(Jong Chul Rhee) 대한소화기학회 1997 대한소화기학회지 Vol.29 No.1
N/A Backgroud/Aims: For many years, it has been thought that gallstone disease was relatively rare and pigment stone was prevalent in Korea. But a few recent studies showed that 60-70% of gallbladder stones in Korea were cholesterol stone. This study was designed to obtain a prevalence and risk factors for gallstone in Korea. Methods: A total of 5,126 persons undergoing routine health screening enrolled in this study. All persons were given a questionnaire about smoking habits, alcoho] consumption, parity, and present illness along with its history of management. Height and body weight were checked. They were examined using ultrasonography and hiochemical test such as lipid profiles and fasting blood glucose. Gallstone disease was defined as the presence of posteriorly shadowing, echogenic, movable structures within the gallbladder as determined by ultrasonography and a history of previous cholecystectomy due to gallstones. Chi-square test and stepwise logistic regression analysis assessed the risk factors for gallstone disease. Results: The prevalence of gallstone disease in Korean adults(above 20 years old) was 4.7% in men and 5.2% in women. The age-standardized prevalence was 3.1% and 3.4% respectively. Gallstone disease was more frequent in the older age groups(6.6% in the sixth decade, 12.2% in the seventh decade, and 20.4% in the eighth decade). Age, obesity, hypertriglyceridemia, and diabetes were risk factors for gallstone disease. Smoking, alcohol consumption, parity, and hypercholesterolemia including LDL-C did not differ significantly between persons with and without gallstone disease. Conclusions: The prevalence of gallstone in Korean adults are 3.1% in men and 3.4% in women. The risk factors for gallstone are age, obesity, hypertriglyceridemia, and diabetes. Further studies will be needed about the prevalence of gallstone disease in general population according to the composition of gallstone.(Korean J Gastroenterol 1997; 29:85-92)
십이지장-위 역류의 진단에 있어서 24-Hour Ambulatory Bile Reflux Monitoring(Bilitec)의 문제점
김홍식,이화영,윤길원,고광철,김재준,백승운,이종철,손정일,이풍렬,전성국 대한소화기학회 1998 대한소화기학회지 Vol.30 No.2
Background/Aims: Duodenogastric reflux is thought to be a potential cause of functiona] dyspepsia but this point is still in debate. Many types of tests were used to diagnose duodenogastric reflux but none was accepted as the gold standard. In recent years, a 24-hour ambulatory bile reflux monitoring(Bilitec^(R)) was introduced. This study was done to analyze the amount and the frequency of duodenogastric reflux and to investigate the efficacy and prnblems of Bilitec^(R) in functional dyspeptic patients and normal controls. Methods: We first measured optical absorbance of 20 common Korean foods. We exarnined 10 functional dyspeptic patients with endoscopic evidence of bile regurgitation, 10 gastritis or peptic ulcer disease patients and 10 asymptomatic normal controls with Bilitec^(R). Duodenogastric reflux was considered as positive when bile absorbance exceeded 0.14 during Bilitec^(R) examination. We also investigated technical difficulties and patients tolerance during the Bilitec^(R) examination. Results: Among the 20 Korean foods, kimchi, soybean paste, cabbage, apple, and egg gave false positives on the Bilitec examination. Technically, the probe was located optimally on the antrum in only 23 out of 30 subjects, but the probe was located on the body in two, the fundus in three and the probe could not be inserted due tv poor cooperation in three. At the end of the examination, 54% of subjects complained of more discomfort when compared to endoscopy. There was no significant difference in duodenogastric reflux between functional dyspeptic patients and asymptomatic normal controls. There was one case which failed the Bilitec^(R) exam due to probe malfunction. Conclusions: Bilitec^(R) examination is thought to be the best method in the diagnosis of duodenogastric reflux yet. However, some protilems such as false positivity influenced by food material, technical difficulty in locating the probe, probe malfunction and patients discomfort exist. In this study, the role of duodenogastric reflux as a cause of functional dyspepsia is not certain.