임무 분석 및 운용 모사를 통한 큐브위성 초기설계 접근 방법

학위논문 (석사)-- 서울대학교 대학원 : 기계항공공학부, 2013. 2. 정인석.본 논문은 큐브위성을 위한 초기 설계 접근 방법을 제시한다. 특히, pre-phase A의 기술적 적합성에 중점을 맞춰져 있다. Pre-phase A 과정은 성공적인 제안서와 프로젝트를 위해 매우 중요한 단계이다. 간단한 임무 분석 및 운영 모사 방법을 소개하고 이를 도표 기반 초기 설계 접근 방법과 접목시킴으로써 자원을 보다 효율적으로 분배할 수 있다. 운영 모사를 위해 지구 중력구배, 대기의 공기저항, 태양 복사압, 그리고 third body에 의한 섭동을 Cowells method에 포함시켜 운동방정식을 세운다. 우주환경 모사를 위해 항성 위치 모델링, 항성 회전축 모델링, 식(蝕) 모델링, 그리고 대기 밀도 모델링 방법을 소개한다. SNUSAT-1 초기설계를 위해 제안된 도표 기반 초기 설계와 최상위 요구사항을 통해 pre-phase A 기술적 적합성 평가를 수행한다.This study presents an initial design approach method for CubeSats. The study focuses on the pre-phase A procedure technical feasibility assessment. The pre-phase A procedure is important for a successful proposal and project. By introducing a simple mission analysis and operation simulation method and joining pre-phase A with a table based initial design approach, resources can be efficiently allocated. The study uses Cowells method with perturbing acceleration due to geopotential, atmospheric drag, solar radiation pressure, and third body. Space environment is modeled for ephemerides, rotational elements, eclipse, and atmospheric density. With initial design, using the presented basic design table, and with top-level requirements, pre-phase A procedure of technical feasibility assessment for SNUSAT-1 is performed using the introduced orbit simulation method. As a result, initial design is given for SNUSAT-1.Abstract Table of Contents List of Tables List of Figures List of Symbols 1. Introduction 1 2. Numerical Methods 3 2.1. Equation of Motion 3 2.1.1. Cowells Method 3 2.1.2. Geopotential 4 2.1.3. Atmospheric Drag 8 2.1.4. Solar Radiation Pressure 10 2.1.5. Third Body Perturbation 11 2.2. Numerical Integration 13 3. Space Environment Modeling 15 3.1. Time and Coordinate System 15 3.1.1. Time 15 3.1.2. Coordinate 16 3.1.3. Initialization 18 3.2. Ephemerides 18 3.3. Rotation Elements 24 3.4. Shadow 27 3.5. Atmospheric Model 29 4. Initial CubeSat Design 33 4.1. Structure 33 4.2. Thermal 34 4.3. Onboard Data Handling 34 4.4. Telemetry, Tracking, and Command 35 4.5. Attitude Determination and Control 36 4.6. Electrical Power Subsystem 37 5. Application on SNUSAT-1 39 5.1. Top-Level Requirements 39 5.1.1. Space Segment Requirements 39 5.1.2. Ground Segment Requirements 40 5.1.3. Launch Segment Requirements 40 5.2. Initial Design Approach 41 5.3. Feasibility Assessment 44 5.3.1. Lifetime 45 5.3.2. Link Analysis 45 5.3.3. Power 46 6. Conclusion 52 References 54 Abstract in Korean 56Maste

야간 보광시 광도와 주기에 따른 생육과 광합성 반응

학위논문 (석사)-- 서울대학교 대학원 : 농업생명과학대학 식물생산과학부, 2018. 2. 김기선.These studies were conducted to investigate the influence of supplemental lighting timing in a day (Expt. 1), and to determine how the duration and light intensity during nighttime supplemental lighting (NSL) influence the growth and photosynthesis of the Cymbidium plants (Expt. 2). Nine-month-old Cymbidium Yang Guifei and Wine Shower plants were treated with three different supplemental lighting timings: from 22:00 to 02:00 HR (middle of the night, MN)from 17:00 to 21:00 HR (day extension, DE)and from 07:00 to 09:00 HR plus from 17:00 to19:00 HR (day extension which was divided into two sections, 1/2DE), and with non-supplemental lighting (8/16 hshort day, SD) for 4 months. All of the supplemental lighting treatments were provided by 100% red LEDs (peak at 640 and 660 nm) with 150 µmolm-2s-1 and 800 µmolmol-1 of CO2 was supplied during nighttime. In both cultivars, pseudobulb diameter under supplemental lighting treatments (MN, DE, and 1/2DE) appeared to be greater irrespective of supplemental lighting timings than under SD. Photosynthetic assimilation rate (An) also showed the similar response as growth. These results indicate that supplemental lighting timing application is not required for promoting growth and photosynthesis in these two Cymbidium plants. Furthermore, to accelerate growth and photosynthesis of Cymbidium plants, it is related with the total light integral. Thus, in Expt.2, 2-month-old Cymbidium plants with the same cultivar in Expt. 1 were used to determine how NSL duration and light intensity, which affects NSL light integral, influence growth and photosynthesis. Plants were treated with five NSL durations of 2, 4, 6, 8, and 16 h and three light intensities of 10, 100, and 200 µmolm-2s-1 for 4 months, which provided 13 NSL light integrals ranging from 0 to 11.52 molm-2d-1. After 4 months of NSL treatment, plants in all treatments were then grown in the same ambient photoperiod to identify the residual effects on subsequent growth. In both cultivars, pseudobulb diameter, number of leaves, leaf width, and biomass accumulation significantly increased as NSL duration and light intensity increased. In case of pseudobulb diameter, it increased by 33% and 43% in Yang Guifei and Wine Shower, respectively, as NSL light integral increased from 0 to 11.52 mol∙m-2∙d-1. However, relative chlorophyll content (SPAD value) significantly decreased in Yang Guifei by increasing NSL light integral during NSL treatment but, it recovered after the treatments ended. An during NSL treatment was promoted according to the increase of NSL duration and light intensity in both cultivars. Also, daily An was increased with increasing NSL light integral and showed positive correlation with pseudobulb diameter. These experiments indicate that supplemental lighting during nighttime with high light integral accelerates growth with greater photosynthetic assimilation rate.INTRODUCTION 1 LITERATURE REVIEW 3 Characteristics of Cymbidium 3 Pseudobulb of Cymbidium 3 Growth Affected by Supplemental Lighting 4 MATERIALS AND METHODS 5 Supplemental Lighting Timing in a Day (Experiment 1) 5 Duration and Intensity of Supplemental Lighting during Nighttime (Experiment 2) 10 RESULTS AND DISCUSSION 15 Supplemental Lighting Timing in a Day (Experiment 1) 15 Duration and Intensity of Supplemental Lighting during Nighttime (Experiment 2) 24 LITERATURE CITED 42 ABSTRACT IN KOREAN 49Maste

Estimation of Punching Shear on UHPC Slab

학위논문 (석사)-- 서울대학교 대학원 : 건축학과, 2015. 2. 홍성걸.Nowadays, UHPC (High Performance Fiber Reinforced Concrete) is used widely with its remarkable performance, such as strength, ductility and durability. Due to the fibers in the UHPC which can control the tensile crack, the punching shear capacity of UHPC is higher than that of the conventional concrete, but the structural behavior of UHPC has not been determined completely. In this study, the data were analyzed for confirming the feasibility of the existing equations. In the preliminary study, the punching shear data of fiber-reinforced concrete slabs were analyzed for understanding the fiber effect. By analyzing experimental data, the equation that calculates the concrete, reinforcement and the fiber separately shows more accurate results. However, the method has problem that the coefficients for each terms are usually determined by experimental results. Therefore the relationship between the deformation based on material properties and the punching shear strength should be examined. In this paper, seven slabs with different thickness and fiber volume ratio were tested. In direct tension test, the crack width does not show the relationship according to the fiber volume ratio, but the tensile strength was increasing as the fiber volume ratio was increasing up to 1%. For the fiber content, 1% and 1.5% UHPC do not have big differences in tension test and punching shear test. However, the ratio of tensile strength and the punching shear strength was not proportional. The design tensile strength seems more proportional to the punching shear strength. It is assumed for the reason of un-proportional relationship between the direct tensile strength and punching shear strength that the un-unified crack width and the fibers directivity difficult to control. The thicker slab thickness causes the increment of the punching shear strength with decrement of deformation capacity. The UHPC flat plate shows the wider punching shear area than the conventional concrete. The gentler strut angle for UHPC slab can be assumed in further study for UHPC failure mode. The punching shear strength equations tend to overestimate the thin slabs. From observing the deformation curve and the failure section, it is insisted that the thin slabs have flexural failure behavior. Due to the flexural behavior of the thin slabs, it could not resist the punching load as much as predicted. The minimum slab thickness should be proposed thicker than 40mm. By analyzing the test data, the JSCE code shows the least standard deviation, but it overestimates the punching shear strength. K-UHPC code results are close to the experimental value. However, the study for finding the relationship between the stress and the material property should be performed with effort to reduce the variance.Abstract Contents List of Tables List of Figures Chapter 1. Introduction 1.1 General 1.2 Advantage and Disadvantage of Using UHPC 1.3 Research Strategy and Thesis Outline Chapter 2. Literature Review 8 2.1 ACI code 2.2 K-UHPC code 2.3 Fib Model Code 2010 2.4 KCI code 2012 2.5 Swamy and Ali (1979) 2.6 Narayanan and Darwish (1987) 2.7 Shaaban and Gesunds equation (1994) 2.8 AFGC Code for Ultra High Performance Concrete 2.9 JSCE Chapter 3. Preliminary Analysis 3.1 Summary of preliminary analysis procedures 3.2 Tendency Analysis for Fiber Volume Ratio 3.3 Tendency Analysis for Compressive Strength of Concrete 3.4 Comparison of the Predicted Results and the Experimental Results Chapter 4. Materials and Testing 4.1 Fabrication 4.1.1 K-UHPC 4.1.2 Compression Test 4.1.3 Tension Test 4.2 Test Setting 4.2.1 Specimen Fabrication 4.2.2 Boundary Condition 4.3 Specimen Plan 4.4 Experimental Setup 4.4.1 Frame 4.4.2 Loading 4.4.3 Measurement Plan Chapter 5. Test Results and Analysis 5.1 Summary of the objectives of this experiment 5.2 Failure Mechanism 5.2.1 General 5.2.2 Punching Shear Strength and Displacement 5.2.3 Relationship between the tensile strength and the punching shear strength 5.2.4 Relationship between the load and deflection 5.3 Failure Behavior 5.3.1 Strain Distribution according to the fiber volume ratio 5.3.2 Strain Distribution according to the slab thickness 5.3.3 Failure Section 5.4 Flexural Capacity 5.5 Punching Shear Capacity Chapter 6. Conclusion References 초 록Maste

코워킹 스페이스와 창조성에 대한 연구

학위논문 (석사)-- 서울대학교 대학원 : 공과대학 건설환경공학부, 2019. 2. 정창무.IT분야는 우리나라의 전체 중소기업 R&D지원 중 가장 큰 부문을 차지한다. 더불어 벤처 생태계활성화를 위한 간접지원정책 또한 확대되고 있다. 이는, 우리나라의 벤처정책의 성과가 IT기업의 성과와 근접한 관련이 있다고 볼 수 있다. 우리나라는 도심 중에서도 테헤란로가 IT 분야의 중소•벤처기업의 메카로 대표적이며, 테헤란로의 IT 분야의 중소•벤처기업이 모여서 일하는 곳인 Coworking Space(이하 CWS) 또한 벤처정책에 못지 않은 급성장을 이루고 있다. 2015년 2곳 뿐 이던 서울의 CWS가 2018년 5월 기준 51곳으로 늘어났다. 25.5배이다. 서울 대형건물의 공실률이 위워크(Wework)와 패스트파이브(FastFive) 등의 대형 CWS덕분에 해소되었다는 의견도 있다. CWS는 계속해서 성장세를 보이며도시의 공실률 문제를 어느 정도까지 해결해줄 것이다. 하지만, CWS에 입주하게 되는 우리나라의 중소•벤처기업 또한 CWS의 성장과 비례하게 성장하고 있을까? CWS들이 공통적으로 추구하는 그들의 정체성을 키워드로 나타내자면, 창조성, 아이디어 공유, 지식 공유, 네트워킹 등이 있다. 다시 말해, CWS는 커뮤니티를 통해서 창조적 아이디어와 지식을 공유하며 함께 성장할 수 있는 기회를 제공하는 장소이다. 위워크는 기업들의 창의성을 최대한 끌어낼 수 있는 화장실 개수, 오피스 위치, 콘퍼런스룸 개수까지 빅데이터를 활용해 적용하고 있으며, 구성원들이 자연스럽게 부딪히면서 대화를 나눌 수 있는 내부설계를 한다. 미국의 뉴욕, 시카고, LA에 위치한 위워크 입주한 스타트업의 생존률이 더 높다는 보고는 구성원의 성장에 위워크가 도움이 되었다는 의견을 뒷받침한다. 또한, 미국의 CWS 구성원들의 84%는 CWS입주 이후, engagment'와 'motivation'이 커졌다는 긍정적인 답변을 한 설문결과도 있다. 그러나, 우리나라의 경우는 다르다. 국내 CWS의 구성원을 대상으로 한 연구에 따르면 CWS구성원의 59.8%가 커뮤니티나 네트워킹에 참여하지 않다고 밝혔고, 참여하지 않는 이유에 대한 응답은 네트워킹을 해도 실제로 도움이 되지 않음(29.5%), 네트워킹의 필요성을 느끼지 못함(19.3%)가 가장 많았다. 이는 우리나라의 CWS에서는 아직까지 그 정체성이 제대로 실현되는지에 대한 의문을 준다. 제 4차 산업혁명에서 앞서 나가기 위한 필수조건인 IT산업의 발전이 CWS에 매일 출근하는 구성원들에게 달렸다. 그들이 만들어 나갈 미래의 대한민국의 경쟁력을 다지기 위해 도시는 어떤 CWS를 지향해야 할지에 대한 작은 연구를 진행하였다. 본 연구는 테헤란로 CWS 구성원의 창조성(Creativity)에 대한 연구이다. 구조방정식을 통해 구성원의 창조성에 영향의 정도를 팀 차원, 개인 차원에서 알아낸다. 또한, CWS의 구성요소 중 하나인 전문가 집단의 집적도가 차이가 나는 두 CWS를 비교하여, 전문가 집단 집적도가 창조성에 영향을 주는지를 평가한다. Creativity에 영향을 주는 잠재변수는 네 가지로 구성되어 있으며, 팀 차원의 잠재변수는 Intrateam Competition과 Intrateam Collaboration 이 있다. Creativity에 영향을 주는 개인 차원의 잠재변수는 Intrinsic Motivation과 Extrinsic Motivation이 있다. 팀 차원의 잠재변수와 Creativity에 대한 분석은 개인 차원에 대한 잠재변수를 통제한 후 진행하였다. 또한, 팀 차원의 잠재변수 두 가지는 개인차원의 잠재 변수 두 가지에 영향을 주는 관계로 모형이 설정되었다. 연구의 결과는 팀 차원의 잠재 변수 2가지와 개인 차원의 잠재변수 2가지 모두 Creativity에 유의미한 정적(+) 영향력을 주는 것으로 파악이 되었다. 이는, 팀 내부에 경쟁적 환경이 높을수록, 팀 내부 협력적 환경이 높을수록, 개인의 외부적 동기부여가 클수록, 그리고 개인의 내부적 동기부여가 클수록 창조성이 커진다는 것을 의미한다. 또한, 팀 내부에 경쟁적 환경이 높을수록 개인의 외적 동기부여와 내적 동기부여가 커짐을 의미한다. 조절효과를 통하여 위워크와 논스, 두 집단이 연구의 모형에 어떤 차이를 나타내는가에 대하여 살펴보면, 첫째, 위워크 집단의 팀 내부의 협력적 환경이 높을수록 내적 동기부여가 커지는 영향을 보인 반면, 논스 집단에서는 유효한 영향을 보이지 않았다. 협업은 다른 팀 구성원과 공동 목표를 달성하기 위한 노력이며, 의도적인 지식의 공유이며, 구성원간에 이러한 상호작용은 유대관계에 만족할 수 있는 내적 동기부여로 연결된다. 이는 위워크의 구성원들이 팀 내부적으로 협업으로 인한 내적 동기부여에 대한 영향이 더 활발하게 이루어진다고 할 수 있다. 또 다른 위워크 집단에 대한 조절효과로는 팀 내부적 경쟁적인 환경과 개인의 내재적 동기부여의 유의마한 부적(-)영향이다. 이는, 본래의 가설과 대립되는 결과이며, 모형의 결과와도 대립된다. 위워크 집단의 이와 같은 결과에 대해서는 좀 더 상세한 연구가 필요하다. 논스 집단의 경우, 유의미한 조절효과의 결과는 한 가지로 나타났으며, 이는 내적 동기부여가 창조성을 높인다는 것이다. 논스 집단은 Curation을 통해 면접에 통과 한 구성원들만이 집단에 속할 수 있다. 해당 면접의 내용은 기본사항 및 학력 경력 뿐만 아니라, 어떤 꿈을 가지고 있는지, 인생에서 중요하게 생각하는 가치가 무엇인지 등 개인의 철학과 가치관 대한 것으로 이루어져 있는 것들로 구성되어 있다. 논스의 면접을 통과한 구성원들이 더 확고한 내적 동기부여와 창조성의 정(+)의 연결고리를 만들었을 것이라고 추측해본다. 본 연구는 국내 도심에서 급성장하고 있는 코워킹스페이스가 창조경제를 이끌어갈 IT산업, 특히 스타트업의 발전을 위해 갖추어야 할 요소에 대해 알아보고자 하였다는 것에 그 의의가 있다. CWS 구성원들의 창조성을 키우기 위해 위워크와 같은 대형 CWS공간은 협력샘플사이즈는 구조방정식에 통상적으로 필요한 샘플사이즈인 200개에 미치지 못하지만 왜도와 첨도를 통해 정규분포를 따르는 것을 확인함으로서 모형의 타당성을 입증하였지만, 더 큰 샘플사이즈로 보다 명확한 결과를 도출 할 수 있을 것으로 기대한다. 또한, 전문가의 직접도 지수에 대한 부재로, 전문가의 직접도에 따른 두 집단간의 비교연구를 상세히 진행하지 못하였다. 향후 전문가의 직접도 지수를 발전시킨 후, 해당 지수에 따른 창조성에 대한 연구를 통해 창조경제를 위한 CWS에 대해 상세히 규명하길 기대한다. 본 연구는 세계적으로 블록체인 커뮤니티를 기초로 한 CWS가 생겨남에 따라 진행되었다. 블록체인 뿐만 아니라, 인공지능, 예술, 등 다양한 산업체의 커뮤니티를 위해 생겨나는 CWS에 대한 연구도 진행되길 기대한다.제 1장 서론 1 1.1 연구의 배경 및 목적 1 1.2 연구의 범위 2 제 2장 창조성(Creativity) 4 2.1 창조성 정의 관련 이론 4 2.2 창조성 관련 선행연구를 통한 가설 설정 5 제 3장 코워킹스페이스(CWS) 10 3.1 CWS정의 관련 이론 10 3.2 CWS관련 선행연구를 통한 가설 설정 12 제 4장 분석결과 14 4.2 변수들의 탐색적 요인분석 16 4.3 변수들의 확인적 요인분석 결과 18 4.4 판별타당성 21 4.5 전체 연구모형의 적합도 평가 24 4.6 간접효과 검증 27 4.7 위워크, 논스에 따른 조절효과 검증 28 제 5장 결론 32 5.1 결론 및 시사점 32 5.2 연구의 한계 33 참고문헌 34 부록 44Maste

Improvement of Peak Cough Flow After the Application of a Mechanical In-exsufflator in Patients With Neuromuscular Disease and Pneumonia: A Pilot Study

OBJECTIVE: To investigate and demonstrate persistent increase of peak cough flow after mechanical in-exsufflator application, in patients with neuromuscular diseases and pneumonia. METHODS: A mechanical in-exsufflator was applied with patients in an upright or semi-upright sitting position (pressure setting, +40 and -40 cmH2O; in-exsufflation times, 2-3 and 1-2 seconds, respectively). Patients underwent five cycles, with 20-30 second intervals to prevent hyperventilation. Peak cough flow without and with assistive maneuvers, was evaluated before, and 15 and 45 minutes after mechanical in-exsufflator application. RESULTS: Peak cough flow was 92.6 L/min at baseline, and 100.4 and 100.7 L/min at 15 and 45 minutes after mechanical in-exsufflator application, respectively. Assisted peak cough flow at baseline, 15 minutes, and 45 minutes after mechanical in-exsufflator application was 170.7, 179.3, and 184.1 L/min, respectively. While peak cough flow and assisted peak cough flow increased significantly at 15 minutes after mechanical in-exsufflator application compared with baseline (p=0.030 and p=0.016), no statistical difference was observed between 15 and 45 minutes. CONCLUSION: Increased peak cough flow after mechanical in-exsufflator application persists for at least 45 minutes.ope

Response: Precise Pulmonary Function Evaluation and Management of a Patient With Freeman-Sheldon Syndrome Associated With Recurrent Pneumonia and Chronic Respiratory Insufficiency (Ann Rehabil Med 2020;44:165-70)

ope

Precise Pulmonary Function Evaluation and Management of a Patient With Freeman-Sheldon Syndrome Associated With Recurrent Pneumonia and Chronic Respiratory Insufficiency

Freeman-Sheldon syndrome (FSS) is a rare distal arthrogryposis syndrome. There are few reports on the respiratory insufficiency of FSS. Additionally, there is no detailed information on pulmonary functional evaluation. A 17-year-old male patient with FSS developed respiratory failure, leading him to be admitted to hospital several times for evaluation and treatment. Of those times he was admitted, two were due to pneumonia. His pulmonary functions were indicative of a restrictive lung disease potentially caused by severe scoliosis. After a non-invasive ventilatorwas applied correctly to the patient, pulmonary hypertension was normalized. His pulmonary function has been maintained for 13 years. Since receiving proper respiratory care, which includes assisted coughing methods, the patient has not developed pneumonia. It is important to properly evaluate the pulmonary function of patients who have FSS and scoliosis to eliminate the risk of long-term respiratory complications.ope

A new histone deacetylase inhibitor improves liver fibrosis in BDL rats through suppression of hepatic stellate cells

BACKGROUND AND PURPOSE: Activation of hepatic stellate cells (HSCs) is a crucial step in the pathogenesis of hepatic fibrosis. Histone deacetylase (HDAC) is an attractive target in liver fibrosis because it plays a key role in gene expression and cell differentiation. We have developed a HDAC inhibitor, N-hydroxy-7-(2-naphthylthio)heptanomide (HNHA), and investigated the anti-fibrotic activity of HNHA in vitro and in vivo. EXPERIMENTAL APPROACH: We investigated the anti-fibrotic effect of HNHA on mouse and human HSC activation in vitro and in the liver of bile duct-ligated (BDL) rats in vivo using cell proliferation assays, cell cycle analysis, biochemical assay, immunohistochemistry and Western blots. Liver pathology was assessed with histochemical techniques. KEY RESULTS: HNHA inhibited proliferation and arrested the cell cycle via p21 induction in HSCs. In addition, HNHA induced apoptosis of HSCs, which was correlated with reduced COX-2 expression, NF-κB activation and cell death signals. HNHA restored liver function and decreased the accumulation of extracellular matrix in the liver via suppression of HSC activation in BDL rats in vivo. HNHA administration also increased survival in BDL rats. CONCLUSIONS AND IMPLICATIONS: HNHA improved liver function, suppressed liver fibrosis and increased survival of BDL rats, accompanied by reduction of cell growth, activation and survival of HSCs. These findings show that HNHA may be a potent anti-fibrosis agent against hepatic fibrosis because of its multi-targeted inhibition of HSC activity in vivo and in vitro.ope

THE EFFECT OF TOPICAL APPLICATION WITH STEROID AND CYCLOSPORINE ON ORAL LICHEN PLANUS PATIENTS

The purpose of this study was comparing the effectiveness in the topical applications of cyclosporine with that of steroid, the conventional and standard drug in the treatment of oral lichen planus. 21 patients with oral lichen planus were treated with cyclosporine (n=11) or steroid (n=10) by random allocations. They were recalled 2 weeks, 4 weeks, and 8 weeks after initial treatments. In each recall, the lesion size, clinical symptoms like pain or burning sensation, and side effects were evaluated. The differences of these measurements were compared and the effects of each drug were checked. In reticulation types, steroid showed higher effectivity than cyclosporine and this difference was significant statistically. But in erythema type lesions, either drug showed no significant recovery, statistically. However, the effect of cyclosporine was thought to be more effective. The pain of the lesions was significantly decreased by cyclosporine but not by steroid. The decrease of burning sensation was more dependant upon steroid than cyclosporine, but no statistical relationship could be found. There were no clinical side effects. There was limitation to draw in conclusion due to small pool of this study group. But with the results, this suggestion could be proposed that either drug might be superior to another in effectivity in a specific lesion type or patient symptom, so selection and usage of one drug in a specific case could be better than universal application of one drug in all cases.서울대학교병원 일반연구과

烟客 許佖 書畵 硏究

학위논문(석사)--서울대학교 대학원 :고고미술사학과 미술사학전공,2004.Maste