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( Jeong Sik Byeon ),( Benjamin Kim ),( Seung Jae Myung ),( Suk Kyun Yang ),( Jin Ho Kim ),( Kee Wook Jung ),( Hyun Suk Song ),( Kee Don Chol ),( Byong Duk Ye ),( Seung Hyun Kwon ),( Mi Young Do ),( So 대한소화기학회 2007 SIDDS Vol.9 No.-
Background/Aims: Although the diagnostic and therapeutic value of double balloon endoscopy (DBE) have been investigated in many studies, the subjective tolerability to DBE has not been assessed. We aimed to evaluate the tolerability to a DBE. Methods: Patients who underwent DBE in Asan Medical Center between March 2005 to March 2007 were eligible in this study. For the comparison of tolerability to DBE with that to EGD and colonoscopy, those who had not undergone EGD nor colonoscopy were excluded. A total of 52 patients were included in this study. Because 7 patients underwent both antegrade and retrograde DBE approach, the total number of DBE procedures analyzed in this study was 59. All procedures were performed under conscious sedation. Tolerability to DBE, EGD, and colonoscopy was assessed through an interview using a standardized questionnaire. Results: A total of 36 patients underwent both antegrade DBE and EGD under conscious sedation. The level of abdominal pain during procedures, the level of post-procedural abdominal discomfort and the proportion of patients with persistent abdominal discomfort till the next morning were higher in antegrade DBE. However, when analyzed in 16 patients who had good quality of sedation, the differences in the level of abdominal pain during procedures and the persistent abdominal discomfort till the next morning disappeared. A total of 23 patients underwent both retrograde DBE and colonoscopy under conscious sedation. Tolerability parameters were not different between retrograde DBE and colonoscopy. Serious complications including hemodynamic instability did not occur during all procedures. Conclusions: Patients tolerate DBE well. DBE can be performed as comfortably as EGD and colonoscopy if the quality of sedation is good enough.
VANET에서 네트워크 단절을 줄이기 위한 브로드캐스팅 프로토콜에 대한 연구
변정식(Jeong-Sik Byeon),김태환(Tea-Hwan Kim),홍원기(Won-Kee Hong) 한국정보과학회 2006 한국정보과학회 학술발표논문집 Vol.33 No.2D
VANET은 인프라의 도움 없이 차량 간 무선 에드 혹 네트워크를 구축하는 기술이다. VANET은 MANET과는 달리 고속의 이동성 , 높은 차량 밀도 , 잦은 토폴로지 변화등의 특징으로 인해 잦은 네트워크 단절과 네트워크 부하증가 등의 문제들을 가진다. 특히 네트워크 단절은 VANET에서 응급메세지 전파 시간 지연 및 네트워크 연결성 저하의 주요 요인이다. 본 논문에서는 이러한 네트워크 단절을 해결하기 위해 적응형 전달노드 검색(ARNS : Adaptive Relay Node Search) 브로드캐스팅 알고리즘을 제안한다. ARNS는 네트워크 단절 발생 시에만 선택적으로 위험지역 외의 영역에서 노드를 재 검색함으로 낮은 네트워크 부하와 낮은 네트워크 단절율을 가진다. 또한 ARNS은 짧은 전송거리와 낮은 차량밀도에도 네트워크 단절에 강한 특성을 지닌다.
변정식 ( Jeong Sik Byeon ),양석균 ( Suk Kyun Yang ),이윤정 ( Yun Jung Lee ),최재원 ( Jae Won Choe ),이진혁 ( Gin Hyug Lee ),명승재 ( Seung Jae Myung ),정훈용 ( Hwoon Yong Jung ),홍원선 ( Weon Seon Hong ),김진호 ( Jin Ho Kim ),민 대한장연구학회 2003 Intestinal Research Vol.1 No.1
The pathogenesis of ulcerative colitis is complicated and both the genetic and environmental factors contribute to its development. Familial occurrence is an example indicating that both the genetic and environmental factors play some parts in the development of ulcerative colitis because family members have similar genetic characteristics and have been exposed to similar environment. Familial ulcerative colitis is observed in about 10% to 20% of patients. Most such families contain only 2 affected members and families containing more than 2 affected members are relatively rare. We experienced a case of familial ulcerative colitis in which all 4 members (both spouses and their 2 sons) were affected. They had lived together for 29 years before all 4 members were affected. The first patient was diagnosed after 14 years of cohabitation and the rest were affected 13, 14, and 15 years after the first diagnosis. We report this case with a review of literature. (Intestinal Research 2003;1:72-77)
대장암의 조기 발견 및 치료에 대한 전략 ; 조기대장암의 내시경을 이용한 치료
변정식 ( Jeong Sik Byeon ) 대한내과학회 2010 대한내과학회지 Vol.79 No.2
The detection of early colon cancer has increased since the advent of screening colonoscopy. Endoscopic resection can be performed to cure early colon cancer with no metastasis. Therefore, we should correctly predict the possibility of metastasis before a trial of endoscopic resection. Metastasis may be assessed using chromoscopy with magnification, narrow band imaging, and endoscopic ultrasound, as well as with conventional imaging studies such as computed tomography (CT) and magnetic resonance imaging (MRI). Various endoscopic resection techniques, including endoscopic submucosal dissection, can be performed to resect early colon cancer. The histopathological evaluation of endoscopically resected early colon cancer can provide clinicians with further information about the risk of regional lymph node metastasis. The decision to perform additional surgery is based on the histopathological examination of the resected specimens. (Korean J Med 79:119-124, 2010)
Coherent Absorption Spectroscopy with Supercontinuum for Semiconductor Quantum Well Structure
Byeon, Ciare C.,Oh, Myoung-Kyu,Kang, Hoon-Soo,Ko, Do-Kyeong,Lee, Jong-Min,Kim, Jong-Su,Choi, Hyoung-Gyu,Jeong, Mun-Seok,Kee, Chul-Sik Optical Society of Korea 2007 Current Optics and Photonics Vol.11 No.3
We suggest that supercontinuum can be used for absorption spectroscopy to observe the exciton levels of a semiconductor nano-structure. Exciton absorption spectrum of a GaAs/AlGaAs quantum well was observed using supercontinuum generated by a microstructrured fiber pumped by a femtosecond (fs) pulsed laser. Significantly narrower peaks were observed in the absorption spectrum from 11 K up to room temperature than photoluminescence (PL) spectrum peaks. Because supercontinuum is coherent light and can readily provide high enough intensity, this method can provide a coherent ultra-broad band light source to identify exciton levels in semiconductors, and be applicable to coherent nonlinear spectroscopy such as electromagnetically induced transparency (EIT), lasing without inversion (LWI) and coherent photon control in semiconductor quantum structures.
Clinical outcome of endoscopic management in delayed postpolypectomy bleeding
( Jeong-mi Lee ),( Wan Soo Kim ),( Min Seob Kwak ),( Sung-wook Hwang ),( Dong-hoon Yang ),( Seung-jae Myung ),( Suk-kyun Yang ),( Jeong-sik Byeon ) 대한장연구학회 2017 Intestinal Research Vol.15 No.2
Background/Aims: The clinical course after endoscopic management of delayed postpolypectomy bleeding (DPPB) has not been clearly determined. This study aimed to assess clinical outcomes after endoscopic hemostasis of DPPB and evaluate risk factors for rebleeding after initial hemostasis. Methods: We reviewed medical records of 198 patients who developed DPPB and underwent endoscopic hemostasis between January 2010 and February 2015. The performance of endoscopic hemostasis was assessed. Rebleeding negative and positive patients were compared. Results: DPPB developed 1.4±1.6 days after colonoscopic polypectomy. All patients achieved initial hemostasis. Clipping was the most commonly used technique. Of 198 DPPB patients, 15 (7.6%) had rebleeding 3.3±2.5 days after initial hemostasis. The number of clips required for hemostasis was higher in the rebleeding positive group (3.2±1.6 vs. 4.2±1.9, P =0.047). Combinations of clipping with other modalities such as injection methods were more common in the rebleeding positive group (67/291, 23.0% vs. 12/17, 70.6%; P <0.001). Multivariate analysis showed a large number of clips and combination therapy were independent risk factors for rebleeding. All the rebleeding cases were successfully managed by repeat endoscopic hemostasis. Conclusions: Endoscopic hemostasis is effective for the management of DPPB because of its high initial hemostasis rate and low rebleeding rate. Endoscopists should carefully observe patients in whom a large number of clips and/or combination therapy have been used to manage DPPB because these may be related to the severity of DPPB and a higher risk of rebleeding. (Intest Res 2017;15:221-227)
운동목표 심박수 설정을 위한 산소섭취량과 심박수와의 관계
변정오,체에스터,김남익,최건식,성기홍 한국유산소운동과학회 1999 대한스포츠융합학회지 (jcses) Vol.3 No.1
This study is a concrete measurement was made of both maximal oxygen uptake and maximal heart rate of general male college students, and a comparison was made of them and the predicted maximal heart rate by age. And the %HR of 40%, 60%, 80%, 85% by exercise intensity to %HRmax was calculated, and %HR and %VO_2 were compared. An attempt was made to intensity whether data on the ratio of %VO_2max to %HR, the research data of ACSM, has the same result as that for male college students in our country. As a result, the findings were as follows; 1. The predicted maximal heart rate was calculated by using the computational formula for predicted maximal heart rate such as ① HRmax=220-age, and ② HRmax=205-(age/2) with the use fo HRmax obtained in 10 healthy male college students and their ages through Bruce Protocol. As a result of SNK on them, it was shown that there was a significant difference in the results of comparing HRmax obtained by using Bruce Protocol and HRmax=220-age. It was shown that there was not a significant difference in the comparison of HRmax obtained by using Bruce Protocol and HRmax=205-(age/2). 2. For the ratio of 50%. 60%, 70%, 80%, 90percent %HRmax in general male college students, their oxygen uptake was shown to be 25.1% at heart rate of 50%, 42.6% at heart rate of 60%, 53.0% at 30%, 66.2% at 80%, and 83.5% at 90%. 3. It was shown that the ACSM's heart rate at 40% of exercise intensity to ACSM's VO_2max was 55.0%. It was revealed that the subject's heart rate was 60.0%, which indicates that there was a significant difference between both groups.ACSM, showed heart rates of 70.0% 80.0%, 90.0% at exercise intensity of 60%, 80%, 85%, while the subject's %HR were 75.6%, 88.6%, and 92.5%, which indicates that there was a significant difference at a level of p<.05. The findings of this study, intended for general made college students, showed a higher heart rate that to maximal oxygen uptake by age suggest by ACSM. It is thought that this difference results from several factors such as region, race, subject's fitness level, number of cases and other characteristics. The target heart rate of the ordinary individual in the twenties of our country to establish exercise intensity showed a difference from heart rate by age suggested the ACSM. Therefore, an continual effort should be made of several forms of exercise prescription that fitly Korean people.
가족샘종폴립증에 대한 전대장직장절제술 후 회장낭에 발생한 다발성 샘종 2예
강정민 ( Jeong Min Kang ),변정식 ( Jeong Sik Byeon ),박종하 ( Jong Ha Park ),안지용 ( Ji Yong Ahn ),고옥배 ( Ock Bae Ko ),명승재 ( Seung Jae Myung ),양석균 ( Suk Kyun Yang ),김진호 ( Jin Ho Kim ) 대한소화기학회 2010 대한소화기학회지 Vol.56 No.1
Familial adenomatous polyposis (FAP) is an inherited disease characterized by the development of hundreds of colorectal adenomas, leading to a 100% lifetime risk of colorectal cancer. A prophylactic colectomy is recommended for patients with FAP to prevent colorectal cancer. Four surgical strategies are available for patients with FAP: proctocolectomy with permanent ileostomy, colectomy with ileorectal anastomosis, proctocolectomy with Koch`s pouch continent ileostomy (Koch), and restorative proctocolectomy with ileal pouch-anal anastomosis (IPAA). Koch and IPAA, which make ileal pouch, have theoretical advantage of the elimination of the risk of colorectal cancer and adenomas and good functional outcome of reduced defecation frequency. However, recent reports have shown frequent development of adenomas and carcinomas in the ileal pouch after Koch or IPAA. We experienced 2 cases of multiple pouch adenomas after pouch surgery in FAP patients. Both patients were treated with endoscopic mucosal resection without complications. We report these 2 cases with a review of literatures. (Korean J Gastroenterol 2010;56:49-53)
( Yun Sik Choi ),( Wan Soo Kim ),( Sung Wook Hwang ),( Sang Hyoung Park ),( Dong-hoon Yang ),( Byong Duk Ye ),( Seung-jae Myung ),( Suk-kyun Yang ),( Jeong-sik Byeon ) 대한장연구학회 2020 Intestinal Research Vol.18 No.1
Background/Aims: We aimed to investigate the proportion of and risk factors for residual cancer and/or lymph node metastasis after surgery was performed because of high-risk pathological features in endoscopic resection specimen of suspected superficial submucosal colorectal cancer (SSMC). Methods: We reviewed medical records of 497 patients (58.8±9.8 years, 331 males) undergoing endoscopic resection of suspected SSMC. High-risk pathological features included: deep submucosal cancer invasion ≥1,000 μm; positive lymphovascular and/or perineural invasion; poorly differentiated adenocarcinoma; and positive resection margin. We investigated the occurrence of additional surgery and residual cancer and/or lymph node involvement in the surgical specimen. Results: En bloc resection was performed in 447 patients (89.9%). High-risk pathological features were detected in 372 patients (74.8%). Additional surgery was performed in 336 of 372 patients with high-risk pathological features. Of these, 47 surgical specimens (14.0%) showed residual cancer and/or lymph node metastasis. Piecemeal resection was more common in those with residual cancer and/or lymph node involvement than those without (9/47 [19.1%] vs. 24/289 [8.3%], P=0.032). Positive resection margin was also significantly associated with positive residual cancer and/or lymph node involvement. As the number of high-risk pathological features increased, the risk of regional lymph node metastasis increased proportionally (P=0.002). Conclusions: High-risk pathological features were frequently detected after endoscopic resection of suspected SSMC while residual cancer and/or lymph node metastasis were not commonly present in the additional surgical specimen. Further optimized strategy for proper endoscopic management of suspected SSMC is necessary. (Intest Res 2020;18:96-106)