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장정환,이정휘,김성곤,장승필,Jang, Jeong Hwan,Lee, Jung Whee,Kim, Sung Kon,Chang, Sung Pil 한국강구조학회 1997 韓國鋼構造學會 論文集 Vol.9 No.4
모달실험 기법의 강부재 손상발견 적용성에 대한 실험적 연구를 수행하였다. 단경간 및 2경간 강재보에 손상을 모사한 단계적인 절단을 가하면서 모달실험을 반복하고, 손상 정도에 따른 모달 파라미터의 변화를 관찰하였으며, 실험 결과를 검증할 목적으로 수치해석을 병행하였다. 고려한 모달 파라미터는 고유진동수(Frequency), 변위 모드형상(Displacement Mode Shape), 변형률 모드형상(Strain Mode Shape)이며, 이들 모달 파라미터를 구하기 위하여 가속도계와 변형률계를 사용한 모달실험을 실시하였다. 각각의 손상단계에서 손상에 의한 변위 모드형상과 변형률 모드형상의 변화를 위치에 대해 정량적으로 나타내기 위하여, CoMAC과 Modal Vector Error를 사용하였다. 고유진동수는 손상의 정도가 심해짐에 따라 감소하는 경향을 보였으며, 손상의 위치를 발견하는 데에 가장 효과적으로 사용될 수 있는 것은 변형률 모드형상이었다. A series of experimental tests have been performed on a tube beam in which artificial damage is applied in order to address damage detectability using modal analysis. Modal parameters considered are frequency, displacement mode shape and strain mode shape CoMAC(Coordinate Modal Assurance Criterion) and Modal Vector Error have been adopted for presenting the change of displacement mode shape and strain mode shape. It is revealed strain mode shape is the most sensitive to damage.
정영일(Young Il Jeong),문성표(Seong Pyo Mun),장정환(Jeong Hwan Chang),김권천(Kweon Cheon Kim),민영돈(Young Don Min),김성환(Seong Hwan Kim),조현진(Hyun Jin Cho),김경종(Kyung Jong Kim),류소연(So Yeon Ryu) 대한외과학회 2008 Annals of Surgical Treatment and Research(ASRT) Vol.75 No.3
Purpose: Surgical site infection (SSI) is the most common nosocomial infection in surgical patients, and this accounts for 38% of all patients with nosocomial infections. Despite the advances in techniques and knowledge to prevent infection, SSI remains a significant source of postoperative morbidity and mortality, and it results in a prolonged hospital stay and increased cost. This study aims to assess the incidence of SSI and to identify the risk factors associated with SSI for patients who undergo abdominal operation. Methods: The data on 347 abdominal operations that were done under general anesthesia from 1 August 2005 to 31 July 2006 was collected and reviewed. Results: The overall incidence of SSI was 4.9%. Comorbidity was the independent risk factor for the development of SSI (P=0.011). The development of SSI was related with the American Society of Anesthesiologists (ASA) preoperative assessment score (P=0.025). The duration of the operation had a statistically significant association with an increased risk of SSI on univariate analysis. The wound classification was not associated with SSI. Staphylococcus aureus was the most frequently isolated organism, and all of the cases were methcillin-resistant Staphylococcus aureus. Conclusion: This study demonstrate that comorbidity is a significant independent risk factor for SSI.
IIIa 회장 폐쇄증 환자에서 원위부 회장루를 통한 근위부 공장루 분비물의 지속적 점적 영양 관리 1례
양은석,최윤창,김은영,문경래,장정환,Yang, Eun Seok,Choi, Yun Chang,Kim, Eun Young,Moon, Kyung Rye,Chang, Jeong Hwan 대한소아소화기영양학회 2004 Pediatric gastroenterology, hepatology & nutrition Vol.7 No.2
IIIa형 회장 폐쇄증 환자에서 수술 후 경구 수유와 원위부 회장루를 통한 지속적인 위장관 영양의 병행으로, 하부 위장관 성장을 도모하고 총 정맥 영양의 합병증 등을 감소하였으며 정상적으로 체중이 증가한 1례를 경험하여 보고하는 바이다. Short-bowel syndrome is functionally defined as a state of malabsorption following loss of small bowel, which comprises the sequelae of nutrient, fluid, and weight loss. The proximal segment of the bowel of a patient with intestinal atresia is usually grossly distended and atonic. In contrast, distal segment is smaller. For this reason, anastomosis of the proximal and the distal segment is technically difficult and may cause no propulsion even when they are anastomosed. We experienced that continuous drip ileostomy feeding with the secretions from the proximal stoma stimulated the distal bowel to accommodate and resolved many sequelae following loss of small bowel in a patient with short-bowel syndrome due to IIIa ileal atresia.
일차성 하지 정맥류에서 정맥내 레이저 치료술의 임상적 고찰
장기훈(Ki Hun Jang),장정환(Jeong Hwan Chang),김성환(Seong Hwan Kim) 대한외과학회 2007 Annals of Surgical Treatment and Research(ASRT) Vol.72 No.5
Purpose: Endovenous laser treatment for incompetent great saphenous vein (GSV) has been recently proposed as an effective means of treatment. The aim of this study is to identify the complications and safety of EVLT as the main treatment for primary varicose vein incompetence when used concomitantly with miniphlebectomy and sclerotherapy. Methods: We reviewed the records of 153 patients who underwent EVLT. Venous duplex scanning was performed 3 months after surgery in all the patients. The clinical outcomes were evaluated using questionnaires at the outpatient clinic or through phone calls. Results: Considering the 97% satisfaction rate of EVLT, EVLT was an effective treatment for primary varicose vein. We observed complications such as paresthesia (20.9%), pain lasting more than 2 weeks (11.8%), ecchymosis or bruising (7.2%) that subsided spontaneously, superficial burn (5.2%) and phlebitis (2%) that was controlled by conservative treatment. The GSV recanalization rate 3 months after the procedure was 3.3%, resulting in a 96.7% success rate. Conclusion: The early results indicate that EVLT is an effective and safe procedure to eliminate the SFJ (saphenofemoral junction) and obliteration of the GSV. However, long-term follow-up is necessary in our study. Better treatment outcomes are possible with accumulated experience and the establishment of strict indications for EVLT.