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서광일 ( Kwang Il Seo ),김성은 ( Sung Eun Kim ),박무인 ( Moo In Park ),박선자 ( Seun Ja Park ),문원 ( Won Moon ),김재현 ( Jae Hyun Kim ),정경원 ( Kyoungwon Jung ),박정구 ( Jung Gu Park ) 대한소화기학회 2017 대한소화기학회지 Vol.69 No.3
Laparoscopic surgical approaches, compared with open surgical approaches, provide comparable clinical outcomes, but lower complications. Unfortunately, a rare complication-portomesenteric vein thrombosis-had been reported after laparoscopic surgery. A 42-year-old woman was referred our hospital for recurrent abdominal pain after laparoscopic appendectomy from acute appendicitis. It was determined that abdominal pain was due to postoperative superior mesenteric vein thrombus. A six-month anticoagulation therapy is an excellent treatment for superior mesenteric vein thrombus . Therefore, physicians should be aware of portomesenteric vein thrombosis in patients with newly developed abdominal pain after successful laparoscopic surgical management. (Korean J Gastroenterol 2017;69:187-190)
서광일 ( Kwang Il Seo ),강상범 ( Sang-bum Kang ) 대한소화기학회 2019 대한소화기학회지 Vol.73 No.5
The hepatobiliary system is one of the most common sites of extraintestinal manifestation in patients with inflammatory bowel disease (IBD). The progression of IBD can lead to a primary hepatobiliary manifestation and can occur secondary to multiple drugs or accompanying viral infections. Primary sclerosing cholangitis is the representative hepatobiliary manifestation of IBD, particularly in ulcerative colitis. Although most agents used in the treatment of IBD are potentially hepatotoxic, the risk of serious hepatitis or liver failure is low. The prevalence of HBV and HCV in IBD is similar to the general population, but the clinical concern is HBV reactivation associated with immunosuppressive therapy. Patients undergoing cytotoxic chemotherapy or immunosuppressive therapy with a moderate to high risk of HBV reactivation require prophylactic antiviral therapy. On the other hand, HCV has little risk of reactivation. Patients with IBD are more likely to have nonalcoholic fatty liver disease than the general population and tend to occur at younger ages. IBD and cholelithiasis are closely related, especially in Crohn's disease. (Korean J Gastroenterol 2019;73:248-259)
궤양성 대장염 환자에서 우연히 발견된 항문 흑색종 1예
서광일 ( Kwang Il Seo ),문원 ( Won Moon ),김성은 ( Sung Eun Kim ),박무인 ( Moo In Park ),박선자 ( Seun Ja Park ) 대한소화기학회 2017 대한소화기학회지 Vol.69 No.6
Inflammatory bowel disease (IBD) is characterized by recurrent or chronic inflammation of the gastrointestinal tract, which results in increased risk of developing cancer. Anorectal malignant melanoma is often misdiagnosed as either hemorrhoids or benign ano-rectal conditions in inflammatory bowel disease. Therefore, the overall prognosis and survival of IBD are poor. To date, the best treat-ment strategy remains controversial. Only early diagnosis and complete excision yield survival benefit. Here, we report a 64-year-old woman with ulcerative colitis, who was found to have anal malignant melanoma on routine colonoscopy. The lesion was confined to the mucosa with no distant metastasis. She underwent complete trans-anal excision. There was no recurrence at the four-year fol-low-up. Physicians should be aware of increased risk of cancer development in IBD patients and remember the importance of metic-ulous inspection of the anal canal. (Korean J Gastroenterol 2017;69:368-371)
혈관 색전술시 사용한 금속 코일을 방사선 추적하여 최소 절개술로 절제한 공장 dieulafoy 병변 1예
서광일 ( Kwang Il Seo ),문원 ( Won Moon ),이천우 ( Cheon Woo Lee ),박선자 ( Seun Ja Park ),박무인 ( Moo In Park ),김성은 ( Seung Eun Kim ),김재현 ( Jae Hyun Kim ),윤기영 ( Ki Young Yoon ),장희경 ( Hee Kyung Chang ) 대한소화기학회 2017 대한소화기학회지 Vol.69 No.2
Dieulafoy`s lesions of the Jejunum are extremely rare. Therefore, localization of lesions is very difficult due to their small size and tendency of occasional bleeding. However, it is important to mention the location of the Dieulafoy`s lesions to prevent excessive intestinal resections or, even worse, resection of the normal intestine. We report a case of preoperative localization of a Dieulafoy`s lesion embolized by a metallic coil that allows a surgeon to accurately identify the bleeding, permitting a minimally invasive surgical treatment. A 25-year-old man presented with massive hematochezia. There was no definite bleeding focus on the upper gastrointestinal endoscopy and colonoscopy. An angiography found a persistent extravasation of the contrast media at the end of straight artery of the mid-jejunal branch, around the terminal ileum, embolized with metallic coils immediately. The combination of embolized metallic coils and intraoperative fluoroscopy allowed accurate identification and minimal laparotomy. Consequently, a highly selective and minimal resection of the jejunum containing the dieulafoy lesion was possible without any postoperative complications. (Korean J Gastroenterol 2017;69:135-138)
흡입 면적에 따른 에어컨 실외기의 온도 분포에 대한 수치적 연구
서광일(Kwang Il Seo),박성현(Seong Hyun Park),하만영(Man Yeong Ha) 대한기계학회 2016 대한기계학회 춘추학술대회 Vol.2016 No.12
The outdoor unit of air conditioner is mostly installed in a place of atmosphere to dissipate heat from the heat exchanger of outdoor unit. When a room temperature is increased due to an effect of discharged air flow from the outdoor unit, the performance of heat exchanger of outdoor unit is getting worse. The intake area, which means an area of breathing fresh air from an atmosphere is a performance metric for enhancing the performance of heat exchanger of air conditioner. Therefore, we consider the intake area in order to investigate the performance of heat exchanger. In this paper, the temperature distribution depended on the intake area of the outdoor unit was investigated numerically. For numerical analysis, commercial code ANSYS 14.5 was used for the flow solver. Cut-cell mesh method was used for the modeling of the outdoor unit, and Semi-Implicit Method for Pressure Linked Equation (SIMPLE) method was used for pressure and velocity coupling. The performance of outdoor unit was evaluated by averaged HX temperature.