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터널식 전력구 시공D/B 분석을 통한 굴착기계 성능 연구
배두산(Du-San Bae),김경열(Kyoung-Yul Kim),정주환(Ju-Hwan Jung),김정주(Jung-Joo Kim),김경도(Kyoung-do Kim),류희환(Hee Hwan-Ryu) 대한전기학회 2021 대한전기학회 학술대회 논문집 Vol.2021 No.7
송전선로 지중화 사업의 종류에는 관로식, 개착식 및 터널식 전력구 등이 있으며, 터널식 전력구의 경우 기계식굴착장비인 밀폐형 쉴드TBM(Tunnel Boring Machine)을 이용하여 지하 30∼90m에 건설된다. 2000년대 이후부터 현재까지 약 200km 연장의 터널식 전력구가 건설되었으며, 최근 들어 건설연장이 매년 약 6km씩 증가하고 있는 추세이다. 터널식 전력구는 땅속의 지반강도, 고수압, 파쇄대 및 단층과 같은 불확실한 지반특성때문에 시공트러블 및 공기지연이 발생되고 있다. 이에 정해진 지중화 사업의 가압목표일 달성을 위한 설계 및 시공 중 굴착효율향상을 위해서는 굴착기계 성능분석이 필요하다. 이에, 본 연구에서는 3개, 약 6km의 터널식 전력구 시공현장으로부터 획득한 굴착기계가 지반을 굴착할 때의 시공데이터 분석을 통하여, 지반굴착 중 암반분류별 디스크커터 압입깊이와 커터헤드회전속도 현황 및 굴착기계 성능에 대해서 연구를 수행하였다.
김배환 ( Bae Hwan Kim ),이준혁 ( Joon Hyuk Lee ),백두산 ( Du San Baik ),윤승욱 ( Seoung Wook Yun ),김지환 ( Ji Hwan Kim ),공재환 ( Jae Hwan Kong ),김석배 ( Seok Bae Kim ) 대한소화기학회 2007 대한소화기학회지 Vol.50 No.6
Gastrointestinal stromal tumor (GIST) is an uncommon mesenchymal tumor of the gastrointestinal tract and is generally located in the stomach and small intestine. They usually present with abdominal pain, gastrointestinal bleeding, and palpable mass. Some patients present with rare symptoms that are more common in malignant GIST. Malignant GIST combined with a liver abscess has not been reported yet in the literatures. We report a case of 67-year-old woman who suffered from liver abscess combined by malignant GIST with central necrosis and fistula in the ileum. She complained of fever, chills, and abdominal pain. Abdominal CT scan showed huge liver abscess and ileal mass with air pocket. Small bowel series showed contrast material filling into the ileal GIST mass. An operation was performed and the final diagnosis was malignant GIST of the ileum with invasion into the sigmoid colon and urinary bladder. (Korean J Gastroenterol 2007;50:393-397)
만성 B형간염 환자에서 심한 피부 발진을 보인 라미부딘 부작용 1예
김석배 ( Seok Bae Kim ),서평주 ( Pyoung Ju Seo ),백두산 ( Du San Baik ),윤세영 ( Se Young Yun ),김병하 ( Byung Ha Kim ),신정은 ( Jung Eun Shin ),김홍자 ( Hong Ja Kim ),송일한 ( Il Han Song ) 대한소화기학회 2006 대한소화기학회지 Vol.48 No.4
Lamivudine is widely used for the treatment of chronic hepatitis B infection because of it`s remarkable antiviral efficacy and safety. We report a case of severe skin eruption caused by lamivudine. A 47-year-old female was admitted because of jaundice and itching sensation. She was diagnosed as chronic hepatitis B infection a few years ago but did not receive any specific treatment. Laboratory data showed acute deterioration of chronic hepatitis B infection. We prescribed lamivudine as a rescue therapy. Her general condition improved and lab data showed improvement in liver function test thereafter. However, she complained of severe skin eruption and itching sensation a few days after the discharge. We stopped lamivudine because the symptoms did not improve despite the use of anti-histamine. Skin biopsy showed interface dermatitis. After stopping lamivudine, her symptoms improved. However, the skin eruption developed again after lamivudine was restarted. Adefovir was used instead, and the patient did not experience any further skin problems since then. (Korean J Gastroenterol 2006;48:281-285)
간경변증 환자에서 말초혈액 Nitric Oxide 활성도 측정의 의의
이보한 ( Bo Han Lee ),백두산 ( Du San Baik ),윤승욱 ( Seoung Ug Yun ),신재민 ( Jae Min Shin ),김지환 ( Ji Hwan Kim ),윤세영 ( Se Young Yun ),김병하 ( Byung Ha Kim ),김석배 ( Suk Bae Kim ),신정은 ( Jeong Eun Shin ),송일한 ( Il Han 대한내과학회 2007 대한내과학회지 Vol.73 No.3
Background: Nitric Oxide (NO) induced by NO synthase is known to be associated with hyperdynamic circulation and collateralization by vascular remodeling in patients with cirrhosis. Methods: To assess the significance of peripheral NO activity in patients with cirrhosis, we measured the production of NO metabolites, nitrate and nitrite, using the nitrate/nitrite colorimetric assay with Griess reagents in the peripheral venous blood of 95 cirrhotic patients with or without clinical portal hypertension (PHT), and in the peripheral venous blood of 32 control patients without liver disease. Results: The peripheral NO activities in cirrhotic patients with clinical PHT, cirrhotic patients without clinical PHT, and non-liver disease control patients were 86.1±40.6 μmol/L, 83.5±47.2 μmol/L and 52.3±38.4 μmol/L, respectively. NO activity was significantly higher in cirrhotic patients than in non-liver disease control patients (p<0.05), while there was no significant difference of NO activity between the cirrhotic patients with or without clinical PHT. Peripheral NO activities in cirrhotic patients with Child-Pugh classification A, B, and C were 84.9±45.5 μmol/L, 81.9±53.2 μmol/L and 86.4±39.8 μmol/L, respectively; these results were not significantly different. A significant correlation of NO activity with the biochemical profiles of the serum albumin level, bilirubin level and prothrombin time were not defined. Conclusions: Peripheral NO activity was increased in cirrhotic patients, but it did not reflect the degree of clinical portal hypertension and the function of the hepatic reserve in this study. For a precise analysis of the association of NO and hyperdynamic circulation with collateralization in cirrhosis, intrahepatic or portal NO activity might be considered rather than peripheral NO activity.(Korean J Med 73:251-257, 2007)
증례 : 소화기 ; 내시경적 Urokinase 주입으로 치료한 위석 1예
김동우 ( Dong Woo Kim ),윤승욱 ( Seung Wook Yun ),김지환 ( Ji Hwan Kim ),김배환 ( Bae Hwan Kim ),라성수 ( Sung Soo La ),백두산 ( Du San Baik ),김석배 ( Suk Bae Kim ) 대한내과학회 2009 대한내과학회지 Vol.76 No.1
단단한 위석을 제거하는 방법으로 코카콜라를 위석 내로 직접 주입하는 것이 기존의 방법보다 비용이나 효과 면에서 우수하다. 하지만 보고자마다 시술 시간의 차이가 크고 본 증례에서도 1개의 위석을 제거하는데 1시간 정도가 걸렸기 때문에 위석이 여러개인 경우에는 다른 주입 물질을 고려해 볼 만하다. Urokinase는 섬유소를 제거하는 역할을 하기 때문에 식물위석의 경우 코카콜라보다 효과적인 물질이라고 여겨진다. 저자들은 3개의 단단한 위석으로 인해 위궤양 및 상복부 통증이 발생하였던 환자에게 첫날 코카콜라 주입 후 위석을 제거하기까지 걸린 시간을 단축시키기 위해서 다음날 urokinase를 주입해 위석 제거시간을 단축시킨 증례를 경험하였기에 문헌고찰과 함께 보고하는 바이다. Bezoars are collections or concretions of indigestible foreign material that accumulate and coalesce in the gastrointestinal tract. Treatment options include dissolution with enzymes, endoscopic removal or aspiration, and surgery. The outcome differs according to the treatment method. A 57-year-old man was admitted with a 1-month history of epigastric pain. On gastrofiberscopy, an approximately 2-cm deep ulcer was seen on the lesser curvature of the antrum and three huge bezoars were found. In order to remove the first one, we injected Coca-Cola into it directly. It took 20 minutes to cut up and 1 hour to remove completely. To decrease the procedure time, we changed the injection fluid to urokinase for the remaining two bezoars. It took 9 and 10 minutes to cut up the second and third bezoars, respectively, and 1 hour to remove them completely. We report a case of phytobezoars treated successfully by endoscopic injections of Coca-Cola and urokinase. (Korean J Med 76:64-69, 2009)
터널식 전력구 쉴드TBM 선정 및 기본설계 사양 제시에 관한 연구
김정주,이지윤,류희환,정주환,이석재,배두산,Jung Joo Kim,Ji Yun Lee,Hee Hwan Ryu,Ju Hwan Jung,Suk Jae Lee,Du San Bae 한국터널지하공간학회 2023 한국터널지하공간학회논문집 Vol.25 No.3
Power cable tunnels is one of the underground structures meant for electricity transmission and are constructed using shield TBM method when transitting across urban and subsea regions. With the increasing shaft depth for tunnels excavation when the shield TBM excavated the rock mass, the review of selecting closed-type shield TBM in rocks becomes necessary. A simplified shield TBM design method is also necessary based on conventional geotechnical survey results. In this respect, design method and related design program are developed based on combined results of full-scale tests, considerable amount of accumulated TBM data, and numerical simulation results. In order to validate the program results, excavation data of a completed power cable tunnel project are utilized. Thrust force, torque, and power of shield TBM specification are validated using Kernel density concept which estimates the population data. The robustness of design expertise is established through this research which will help in stable provision of electricity supply.