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고순도 AlN분체 합성을 위한 Al-N-H-Cl 반응계의 열역학적 평형조성
현상훈,김준학 연세대학교 산업기술연구소 1984 논문집 Vol.16 No.2
Thermodynamic equilibrium compositions in the Al-N-H-Cl system were determined to predict the theoretical equilibrium yields of AlN by the vapor phase reaction of NH₃ and AlCl₃. The calculation procedure of the equilibrium composition was to determine the mixture composition which corresponds to the minimum total Gibbs free energy of the reacting system. The equilibrium yields of AlN at 600-1200 K showed above 90% when the initial amounts of AlCl₃and of NH₃were equal and below ?? moles, respectively. The effect of the total pressure on the equilibrium yields was insignificant. The domain above 95% yields according to the initial ratio of AlCl₃to NH₃at 1200 K and 1300 K was also given. The theoretical aspects for the synthesis of high-purity AlN powders by the gas phase reaction of AlCl₃and NH₃were discussed.
김현준,고재향,박충학 대한부인종양 콜포스코피학회 2003 Journal of Gynecologic Oncology Vol.14 No.1
난소의 원발성 이행세포암은 최근까지 조직학적으로 난소 상피 종양의 독자적인 한 종류로 인식되지 못하고 악성 Brenner 종양으로 분류되어 왔으나 악성 Brenner 종양과는 달리 항암 치료에 좋은 반응을 보이고 환자 생존율이 높은 것으로 알려지면서 하나의 중요한 조직학적 아류(subtype)로 인식하게 되었다. 이행세포암은 요로 상피의잠재력을 갖는 난소의 세포에서 직접 종양이 발생한다고 추정된다. 이행세포암은 조직학적, 생물학적으로 악성도가 매우 높은 종양으로 예후가 극히 불량하여 병기가 낮더라도 낮은 생존율을 보이는 것으로 알려져 왔으며 표준화된 치료법이 없었으나 최근에는 수술 요법과 항암화학요법을 병행 시 예후가 상당히 좋고 높은 생존율을 보이고 있다. 저자 등은 최근 38세 여성에서 그 발생 빈도가 매우 희귀한 좌측 난소의 원발성 이행세포암 1예를 경험하였기에 문헌 고찰과 함께 보고하는 바이다. Primary transitional cell carcinoma of the ovary has been only recently recognized, as one of the main types of ovarian carcinoma because of the favorable response to chemotherapy and improved survival of the patient. Histologically, it is distinguished from malignant Brenner tumor only in the absence of benign or proliferative Brenner tumor component. Recent histopathologic reports show that transitional cell carcinoma of the bladder and of the ovary are immunophenotypically different. Primary transitional cell carcinomas are more aggressive than malignant Brenner tumor. However, primary transitional cell carcinomas have a better response to chemotherapy than other types of ovarian carcinomas. We have experienced a very rare case of primary papillary transitional cell carcinoma of the left ovary in a 38-year-old woman and report it with review of literatures.
김학현,임현준,이광명,조남준 한국비파괴검사학회 2000 한국비파괴검사학회지 Vol.20 No.3
콘크리트 비파괴검사법인 충격공진법의 유용성과 적용 한계를 살펴보기 위하여 실험 및 이론적 연구를 수행하였다. 실험적 연구를 위하여, 다양한 개재물이 포함된 콘크리트 슬래브 공시체를 제작한 후 충격공진법을 적용하여 개재물의 존재 및 매설 위치를 찾아보았다. 공시체들 중 몇 경우에는 개재물의 위치를 정확하게 검출할 수 있었으나, 나머지의 경우에는 검출하지 못하였다. 후자의 경우에 있어서 그 실패 원인을 규명하고, 나아가 본 기법의 유용성을 결정하는 주요 인자들을 알아보기 위하여 유한요소 해석을 수행하였다. 본 연구는 충격공진법의 물리적 이해 증진과 향후 발전에 기여할 것이다. The usefulness and limitations of the impact-resonance method, which is a nondestructive evaluation (NDE) method for concrete, are studied by both experimental and theoretical methods. For the experimental study, several concrete slab specimens with various inclusions embedded were fabricated, and tested by the impact-resonance method. Some of the inclusions have been detected and accurately located, but some have not. The reasons for the failure in the latter cases have been investigated theoretically by using finite element analyses, from which the primary factors determining the success of the method have also been identified. This study will serve to enhance the understanding of the underlying physics and to improve the usefulness of the impact-resonance method as applied to concrete NDE.
조태현,송준혁,김명현,박향권,김성학,신규만,박동빈 梨花女子大學校 醫科大學 醫科學硏究所 2000 EMJ (Ewha medical journal) Vol.23 No.3
Objectives : Lumbar disc herniations at the L1-L2, L2-L3, and L3-L4 level are rare. The purpose of this study is to observe the variable clinical finding of upper lumbar disc herniations and to provide proper treatment modality. Patients and Methods : Between 1998 Jan. and 1999 Dec., seventeen patients with upper lumbar disc herniations who were undergone surgery in our institute were retrospectively evaluated. Patients were evaluated based on following factors : age, sex, aggravating factor, symptoms and signs type of disc herniation, type of surgery, and outcome of post-surgery. Results : The incidence of lumbar disc herniation at the level of L1-2, L2-3 and L3-4 is 6.1% with declining frequency as the level ascends. The peak age incidence is 6th decade in both sex. Preoperative symptomes and signs are variabe. In sixteen cases, posterior approach was done. In these cases, twelve cases were performed microscopic partial hemilaminectomy, and four cases with spinal stenosis were performed total laminectomy and posterior screw fixation with bone fusion. In one case, lateral extracavitary approach was done. In results of operation, fourteen cases showed more than good grade(82%). Conclusion : The age incidence of lumbar disc herniations at the level of L1-2, L2-3 and L3-4 older than lumbar disc herniations at the lower level of L4-5 and L5-S1. The signs and symptoms are variable. In our cases, most of the patients were performed posterior approach with microscopic partial hemilaminectomy except the patients combined spinal stenosis. One case was performed a lateral extracavitary approach because the risk of the cord and cauda equina injuries. The prognosis of upper lumbar disc herniations after treatment with only microscopic partial hemilaminectomy and diskectomy is comparable with the prognosis of lumbar disc herniations at the lower level.
뇌동맥류 파열 후 뇌지주막하 출혈로 인한 신경학적으로 불량한 환자에 대한 급성기 수술의 성적
신규만,김명현,송준혁,김성학 梨花女子大學校 醫科大學 醫科學硏究所 1999 EMJ (Ewha medical journal) Vol.22 No.2
Objective: Despite of recent advances in pharmacological treatment and improvement surgical and anesthetic techniques, subarachnoid hemorrhage(SHA) from ruptured intracranial aneurysms with poor clinical grades still carries unacceptably high morbidity and mortality rates. Recently surgery for aneurysmal SAH with poor clinical grade has increased interest. Method : The authors experienced 57 patients with poor clinical grade (Hunt and Hess grade Ⅳ-Ⅴ) after ancurysmal SAH. Among them 25 patients were treated with immediate CSF drainage via ventriculostomy, blood pressure control, early angiography(except 3 patients) and surgery within 12 hour of admission. The outcomes of patients were categorized using a four-tiered scale : 1) independent and working 2) impaired but independent 3) severly impaired and dependent 4) dead Results : The average age was 48(13-75) and the male to female ratio was 7:18 in surgical group. The average time to admission and surgery was 12 hours or less among the 25 patients. Among them 9 cases were dead, 2 cases were severly impaired and dependent, 3 cases were impaired but dependent, and 11 cases were independent and working. In this patient all cases, exception one could be ligated with a clip. Conclusion : The above results suggest that the acute aggressive surgery based on appropriate selection in poor aneurysmal SAH patients can reduce of the mortality.