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이권범,박환규,홍석주,김기형 조선대학교 동력자원연구소 1996 動力資源硏究所誌 Vol.18 No.1
In this study, when CFRP lamimates are subjected to static loading by the indentation of steel ball to examine a failure mechanism of lamimates, the fracture surface of interlaminar delamination generated at interfaces is investigated by the scanning electron microscopy (SEM). When orthotropic CFRP laimates stacked with two interface are subjected to static loading, interlaminar delaminations extend from the loading side to delamination edge even at any interface, and the fracture surface fo interlaminar delamination generated at two interfaces is symmertrically formed. In the CFRP laminates, the fracture mechanism sppears mainly to be the mixed mode(modes Ⅰ+Ⅱ), and the ratio of mixed mode varies partially. After the fracture initiates at the interface near the loading side with mode Ⅰ, the mixed mode gradually developes, but the total surface at the opposite plane to the loading side fractures with the mixed mode(modes Ⅰ+Ⅱ). While transverse cracks are generated, the direction of shear stresses reverses itself ar the delaminated surface, clarified by the hackle direction of fracture surface.
약물중독에 의한 내원 전 심정지 환자의 특성과 심폐소생술 결과
김윤권,김현,원호경,이권일,오성범,문중범,이강현,황성오,Kim Yun Kwon,Kim Hyun,Won Ho Kyong,Lee Kwon Il,Oh Sung Bum,Moon Joong Bum,Lee Kang Hyun,Hwang Sung Oh 대한임상독성학회 2005 대한임상독성학회지 Vol.3 No.2
Purpose: This study was to investigate the resuscitation outcomes and the clinical characteristics of non-traumatic drug-induced out-of-hospital cardiac arrest by analyzing data from a single institution's registry. Method: We conducted a retrospective study of 795 patients who came to the emergency department with non-traumatic drug-induced out-of-hospital cardiac arrest during the period $1991{\~}2004$. Only patients over 18 years of age were included. Clinical characteristics. variables associated with cardiac arrest, and data during resuscitation were obtained from our cardiac arrest database. Patients were divided into two groups: drug-induced cardiac arrest (drug group, n=33), and non drug-induced cardiac arrest (non-drug group, n=762). Results: Spontaneous circulation was restored in 23 ($72{\%}$) patients in the drug group and in 314 ($45{\%}$) patients in the non-drug group ($x^2=0.020$). The patients who discharged alive number were 46 ($6{\%}$) in the non-drug group and 0 ($0{\%}$) in the drug group ($x^2=0.005$). The witnessed arrest, the epinephrine doses, and total defibrillation energy were not different between two groups. Conclusion: The return of spontaneous circulation rate was higher in the drug group than the non-drug group. However the drug group was lower survival discharge rate than in the non-drug group.
악성 식도협착에서의 금속제 확장형 EsophaCoilTM 인공식도삽관술
박찬욱,이준성,오종훈,이문성,조성원,이권호,심찬섭,송동화,유창범 대한소화기내시경학회 1995 Clinical Endoscopy Vol.15 No.1
Endoscopic endoprosthesis is well established as a cheap, fast and durable procedure for palliation of malignant dysphagia. But the placement of conventional endoprosthesis is difficult and is associated with significant complications such as hemorrhage, perforation and dysfunction of the prosthesis. Recently, self -expand- able metal prosthesis have also been utilized for malignant esophageal stenosis, and palliation of this modality seems to be more effective than other modalities. However the main problems with these metal stents are tumor ingrowth leading to reobstruction, migration, and eophageal trauma by the distal, hard skirt of the stent. EsophaCoil stent is a simple coil with close loops made from a single flat wire of nickel titanium alloy. The radial force of this material is much stronger than stainless steel, expansion time is faster and the stent is able to dilate even extremely resistant strictures. This new metalic stent seems to have several advantages over the current commnerically available ones. We report our experiences with this EsophaCoil stent and review of literature.