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초음파를 이용한 14C 연대측정 토양시료의 부식산 추출법 개발
홍완,박중헌,홍완 한국분석과학회 2009 분석과학 Vol.22 No.2
AMS (Accelerator Mass Spectrometry)를 이용한 방사성 탄소연대측정법으로 퇴적물 및 토양시료를 측정하기 위한 화학적 전처리법의 유기물 회수율을 개선하기 위하여, 초음파를 이용한 방법을 개발하였다. 일반적으로 널리 쓰이는 부식산 전처리법 중 단계 마다 사용되는 스터링법을 대신하여, 초음파(ultrasonic)를 사용하고 초음파 출력, 반응 온도, 반응 시간 등 실험조건을 결정하였다. 유기물 함유량이 적어 연대측정이 불가능했던 시료에 대한 탄소 회수율이 6배 향상되어 다량의 시료를 얻기 힘든 연대측정분야에서는 매우 중요한 개선이 이루어졌다. 또한 동일 시료에 대해 초음파법과 스터링법으로 처리한 시료의 연대측정결과를 비교하여 초음파법이 회수율 향상 이외에는 연대측정결과에 영향을 미치지 않음을 확인하여 실용성이 있음을 증명하였다.
朱寬植,全禹柱,洪完 명지대학교 자연과학연구소 1989 자연과학논문집 Vol.7 No.-
B(E2) and B(M1) from lifetimes of first several excited states of ??Gd have been calculated. And lifetime of 123.08 keV transition from the lowest excited state was measured by delayed coincidence method using TPHC. The lifetime of the transition was 1.176 ns. Furthermore lifetime of the other transitions, 248.11keV, 346.71keV, 557.58keV, 1004.76keV were obtained from other experimental papers. With these values, B(E2) and B(M1) were evaluated by using the Unified Model made by Bohr-Nottelson and compared them with the theoretical values calculated based on I.B.A (Interacting Boson Approximation) model. Excellent agreement was found in the case of B(E) for 123.08keV in 0.26% error.
홍완일,김진식 대한흉부심장혈관외과학회 1968 Journal of Chest Surgery (J Chest Surg) Vol.1 No.1
Author studied the possible pathogenesis of spontaneous pneumothorax and its effective treatment in 33 cases, and the results obtained as follows:1) Of the 33 cases, 15 cases were originated from pulmonary tuberculosis, 11 cases were non-tuberculous natures and 7 cases were followed by traumatic chest injuries which were not associated with a laceration of the lung or rib fractures.2) So called "Idiopathic spontaneous pneumothorax" seemed mostly to be caused by rupture of the emphy- sematous blebs.3) Spontaneous pneumothorax, in process of the pulmonary tuberculosis, seemed to be caused by the rupture of blebs which was formed with a pathological process of chronic pulmonary tuberculosis.4) Author experienced interesting cases of giant blebs which had been fully occupied the right thoracic cavity. At first, it was misdiagnosed as extensive spontaneous pneumothorax on X-ray which was revealed extensive pleural air shadow with total atelectasis of the right lung. A pneumonectomy was performed together with the giant multiple blebs.5] Generally, closed thoracotomy with water-sealed drainage is the treatment of choice in spontaneous pneumothorax. However, open thoracotomy and adequate surgical procedures should be undertaken in patients with continuous air leakage or recurrent attack of spontaneous pneumothorax.aneous pneumothorax.
多性分系 蒸溜塔의 正常狀態 Simulation에 관한 연구(I)
홍완해,김정규 조선대학교 생산기술연구소 1985 生産技術硏究 Vol.7 No.2
A Newton-Raphson method was proposed to develop a general and fast computer program for the simulation of steady-state distillation column. Efficient and reliable numerical methods are required to solve highly interacting nonlinear algebraic equations for the simulation of steady-state distillation column. To improve the performance of Newton-Raphson method, which is often very effective in solving nonlinear equations through the use of linearization, Jacobian correction or sign change correction were utilized. The result show the modified method to be an effective combination of the advantage of each method, with reduction in computing load by the use of Newton-Raphson method and expansion in convergence region through the use of Jacobian correction or sign change correction.
Poly (trimethylene terephthalate) 의 등온결정화 속도에 관한 연구
홍완해,김정규,나상권 한국공업화학회 2000 응용화학 Vol.4 No.2
Isothermal crystallization kinetics of Poly(trimethylene terephthalate), PTT has been investigated using photomicrograph. The crystallization process of PTT was crystal growth and its morphology the Maltese cross.