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제1형 신경섬유종증 환자에서 맹장의 신경섬유종에 의해 발생한 대장중첩증 1예
유준환,함기백,김진홍,정인호,김영배,김재근,선주성,최승준,최준혁,이기명 대한소화기내시경학회 2005 Clinical Endoscopy Vol.31 No.5
제1형 신경섬유종증은 상염색체 우성으로 유전되는 유전성 질환으로 전신에 산재하는 신경섬유종과 cafe-au-lait spot으로 불리는 피부의 색소 침착 등을 볼 수 있다. 제1형 신경섬유종증은 약 25%의 경우에서 위장관을 침범하며 그 중, 위장과 공장을 흔히 침범한다. 그러나 대장의 침범은 매우 드물다. 제1형 신경섬유종증이 대장을 침범한 경우의 임상양상은 대부분 혈변, 변비, 무증상의 직장 종괴 등이다. 지금까지 전신 침범의 특징이 없는 단발성 신경섬유종에 의해 대장중첩증이 발생했다는 보고는 있었으나, 제1형 신경섬유종증의 전신적 특징을 가진 환자에서 대장중첩증이 발생했다는 보고는 없었다. 저자들은 제1형 신경섬유종증을 가진 환자에서 맹장에 발생한 대장-대장형의 장중첩증과 이차적인 급성 충수돌기염을 경험하였기에 문헌 고찰과 함께 보고하는 바이다. Neurofibromatosis type 1 (NF-1) is an autosomal dominant hereditary disorder and it is characterized by neurofibromas and cafe-au-lait spots on the skin. NF-1 affects the gastrointestinal tract in 25% of the cases and the stomach and jejunum are the commonly involved sites. Yet the occurrence of colon NF is very unusual. Several cases of colon involvement of NF-1 have been reported on and their clinical manifestations were massive or occult bleeding, constipation and asymptomatic rectal or perianal nodules. There was a reported case of colon-to-colon intussusception via an isolated colonic neurofibroma. However, the best of our knowledge, there has been no reported case of colon- to-colon intussusception induced by NF-1. We encountered a case of NF-1 involving the cecum that resulted in colon- to-colon intussusception and secondary acute appendicitis. The patient showed the typical skin lesions and bony abnormalities of NF. We report on this case with a review of the literature.
R-IPA를 활용한 농촌관광 외래관광객 마케팅 믹스 분석
유준환,황대용 (사)한국관광레저학회 2022 관광레저연구 Vol.34 No.12
Rural tourism will be preferred in the future as areas with low population density are preferred due to recent changes in perception due to COVID-19. Therefore, this study aims to find improvements in marketing management of Korean rural tourism through R-IPA on the marketing mix item of rural tourism for foreigners with experience in Korean rural tourism. Based on previous studies related to tourism marketing mix for analysis, the survey showed that 'food prices are reasonable', 'promoted better than other places', 'providing various cultural events for foreign tourists', and 'convenient to book tours'. These are items with high importance but low satisfaction. Recently, most rural tourism businesses have been improving their quality by using local specialties and organic food ingredients to provide better food, but it is believed that there has been a lack of delivery. In addition, it is difficult to establish a promotion and reservation system through the Internet due to problems such as aging, and the above results are believed to have been shown as small-scale contents focused on experience rather than cultural events. These items need to be improved first to meet the needs of foreign tourists, and planned and operated separately from the system provided to domestic tourists.
Epidemiology of Foodborne Norovirus Outbreak in Incheon, Korea
유준환,김나연,고연자,이훈재 대한의학회 2010 Journal of Korean medical science Vol.25 No.8
On June 14, 2008, an outbreak of gastroenteritis occurred among elementary school students in Incheon. We conducted an investigation to identify the source and described the extent of the outbreak. We performed a retrospective cohort study among students,teachers and food handlers exposed to canteen food in the elementary school. Using selfadministered questionnaires we collected information on symptoms, days of canteen food eaten, food items consumed. Stool samples were collected from 131 symptomatic people and 11 food handlers. The catering kitchen was inspected and food samples were taken. Of the 1,560 people who ate canteen food, 117 were symptomatic cases, and the attack rate was 7.5%. Consumption of cucumber-crown daisy salad (RR=2.71), fresh cabbage mix (RR=2.23), dried radish salad (RR=3.04) and young radish kimchi (RR=2.52) were associated with illness. Sixty-four (45%) of the 142 stool specimens were positive for norovirus. Norovirus was detected in 2 food handlers. Interviews with kitchen staff indicated the likelihood of contamination from an infected food handler to the dried radish salad during food processing. The excretion of norovirus from asymptomatic food handlers may be an infection source of norovirus outbreaks.
Epidemiology of Campylobacter jejuni Outbreak in a Middle School in Incheon, Korea
유준환,김나연,조남규,김정희,강영아,이하경 대한의학회 2010 Journal of Korean medical science Vol.25 No.11
On July 6, 2009, an outbreak of gastroenteritis occurred among middle school students in Incheon. An investigation to identify the source and describe the extent of the outbreak was conducted. A retrospective cohort study among students, teachers, and food handlers exposed to canteen food in the middle school was performed. Using self-administered questionnaires, information was collected concerning on symptoms, days that canteen food was consumed, and food items consumed. Stool samples were collected from 66patients and 11 food handlers. The catering kitchen was inspected and food samples were taken. Of the 791 people who ate canteen food, 92 cases became ill, representing an attack rate of 11.6%. Thirty-one (40.3%) of the 77 stool specimens were positive for Campylobacter jejuni. Interviews with kitchen staff indicated the likelihood that undercooked chicken was provided. This is the first recognized major C. jejuni outbreak associated with contaminated chicken documented in Korea.
유준환,김나연,이은정,전인상 대한의학회 2011 Journal of Korean medical science Vol.26 No.6
Norovirus (NV) has caused large outbreaks of gastroenteritis in schools. Studies of NV epidemiology in schools related to NV outbreaks have been frequently reported. However,reports of that in schools without outbreaks are not found. Presently, NV molecular epidemiology surveillance was carried out in asymptomatic food handlers working at nonoutbreak elementary schools in Incheon, Korea, in March, April and December, 2009. NV prevalence was examined by real-time reverse transcription-PCR (RT-PCR) and the positive products were re-evaluated by conventional RT-PCR for sequencing. Fecal samples (n = 776) were collected from 776 food handlers in 60 schools. NV was detected in 26 of them (3.4%). Of these, 17 (65%) were positive for NV GII and 10 (38%) were positive for NV GI. Of the 26 samples, 19 were positive by conventional RT-PCR. Sequencing of these 19 strains revealed GII/4 (n = 5), GI/6 (n = 3), GI/14 (n = 2), GII/8 (n = 2), GI/2 (n = 2),GI/10 (n = 1), GII/1 (n = 1), GII/3 (n = 1), GII/7 (n = 1), and GII/16 (n = 1). In this survey,the food handler population unrelated to NV outbreaks was found to normally contain asymptomatic carriers of NV. The excretion of NV from asymptomatic food handlers should be an infection source of NV outbreaks.
Effects of Mesenchymal Stem Cells Treatment on Radiation-Induced Proctitis in Rats
김원희,유준환,유인경,권창일,홍성표 연세대학교의과대학 2023 Yonsei medical journal Vol.64 No.3
Purpose: There are no effective treatment methods with which to control complications of radiation proctitis with fistula or re current bleeding following radiation treatment for prostate, cervical, or rectal cancer. Mesenchymal stem cells (MSCs) can induce immune modification, resulting in tissue repair and regeneration. Therefore, we used a rat model of radiation-induced proctitis and observed the effects of using human placenta-derived (PD) and adipose tissue-derived (AD) MSCs. Materials and Methods: Female Sprague Dawley rats were irradiated at the pelvic area with 25 Gy. We injected 1×106 cells of hu man PD-MSCs, human AD-MSCs, human foreskin fibroblasts, and control media into the rectal submucosa following irradia tion. We sacrificed rats for pathologic evaluation. Results: Fibrosis on the rectum was reduced in both MSC groups, compared to the control group. Mucosal Ki-67 indices of both MSC injected groups were higher than those in the control group. Although caspase-3 positive cells in the mucosa gradually in creased and decreased in the control group, those in both MSC injected groups increased rapidly and decreased thereafter. Conclusion: We demonstrated the effects of regional MSC injection treatment for radiation-induced proctitis in rats. MSC injec tion reduced fibrosis and increased proliferation in rat mucosa. Human AD-MSCs and PD-MSCs had similar effectiveness.