249 research outputs found
한국형 원위 요골 해부학적 수장 금속판 시스템에 대한 초기 결과 보고
학위논문 (석사)-- 서울대학교 대학원 : 의학과, 2014. 2. 백구현.Introduction: Distal radius fracture is the most common fracture of the upper extremity, and approximately 60,000 distal radius fractures occur annually in Korea. Internal fixation with an anatomical volar locking plate is widely used in the treatment of unstable distal radius fractures. However, most of the currently used distal radius anatomical plate systems were designed based on the anatomical characteristics of Western populations. Recently, the Korean-type distal radius anatomical volar plate (K-DRAVP) system was designed and developed based on the anatomical characteristics of the distal radius of Koreans. The purpose of this study was to evaluate the preliminary results of the new K-DRAVP system, and to compare the radiologic and functional results with those of other systems.
Methods: From March 2012 to October 2012, 46 patients with acute distal radius fractures who were treated with the K-DRAVP system at 3 hospitals were enrolled in this study. Standard posteroanterior and lateral radiographs were obtained to assess fracture healing, and three radiologic parameters (volar tilt, radial inclination, and radial length) were assessed to evaluate radiologic outcomes. The range of motion and grip strength, the Gartland and Werley scoring system, and the Disabilities of the Arm, Shoulder and Hand (DASH) questionnaire were used to assess clinical and functional outcomes.
Results: Bony union was achieved in all fractures with a mean time of 42 days. All radiologic parameters were restored to normal ranges, and maintained without any loosening or collapse by the time of final follow-up. Grip strength was restored to 84% of the value of the unaffected side. The mean range of motion of the wrist at final follow-up was 56.2° extension, 51.3° flexion, 15.6° radial deviation, 25.9° ulnar deviation, 81.0° pronation, and 79.6° supination (77–95% of the value of the unaffected side). According to the Gartland and Werley scoring system, there were 16 excellent, 26 good, and 4 fair results. The mean DASH score was 8.4 points. There were no complications after surgery.
Conclusion: The newly developed K-DRAVP system could be used to restore and maintain good anatomical parameters, and provide good clinical outcomes with low complication rates. This system is a promising surgical option for the treatment of distal radius fractures in the Korean population.Contents
Introduction .................................. 1
Materials and Methods ....................... 3
Results .................................... 11
Discussion ................................... 17
Conclusion ................................... 22
References ................................... 23
국문 초록 .................................... 27Maste
열-탄성 댐핑을 가진 마이크로 링 구조물의 불규칙 질량 및 강성 분포 효과
학위논문 (석사)-- 서울대학교 대학원 : 기계항공공학부, 2014. 8. 김지환.Vibration characteristics are an important factor for the stability of structures. Up to now, a ring model is used as a typical model for structures, and then irregularity of point mass distribution has been a main issue for the research works. And rotational speed has been an additional consideration due to the effects of the centrifugal and Coriolis Forces. In this paper, in-plane vibration of thermo-elastic micro ring structures with finite sized imperfection is to investigate. Then, in-extensionality of the model is assumed, and multiple local deviations in structure are to be represented by Heaviside step functions. Fourier's one-dimensional heat conduction equation is to analyze, and Laplace transform method is used to solve the governing equations to obtain analytical solution. Rotational speed is additionally considered and compared with previous results. In order to determine Quality factor (Q-factor) of ring model, primarily, the split of the natural frequencies are discussed with the irregularity of mass and stiffness. Furthermore, variation of Q-factor from rotating effect is researched and compared with prior results. And the mode shapes are compared between perfect and imperfect ring models.Abstract ‥‥‥‥‥‥‥‥‥‥‥‥ i
Contents ‥‥‥‥‥‥‥‥‥‥‥‥ ii
List of Tables and Figures ‥‥‥‥‥‥‥‥‥‥‥‥ iii
List of Nomenclature ‥‥‥‥‥‥‥‥‥‥‥‥ iv
1. Introduction ‥‥‥‥‥‥‥‥‥‥‥‥ 1
2.1 Ring model ‥‥‥‥‥‥‥‥‥‥‥‥ 4
2.1 Ring model ‥‥‥‥‥‥‥‥‥‥‥‥ 4
2.2 Heat Conduction Equation ‥‥‥‥‥‥‥‥‥‥‥‥ 7
2.3 Boundary conditions ‥‥‥‥‥‥‥‥‥‥‥‥ 8
2.4 Natural frequency ‥‥‥‥‥‥‥‥‥‥‥‥ 9
2.5 Q-factor with rotating effect ‥‥‥‥‥‥‥‥‥‥‥‥ 11
3. Numerical Results ‥‥‥‥‥‥‥‥‥‥‥‥ 14
3.1 Code Verification ‥‥‥‥‥‥‥‥‥‥‥‥ 14
3.2 Numerical results ‥‥‥‥‥‥‥‥‥‥‥‥ 14
3.2.1 Mass and stiffness effect ‥‥‥‥‥‥‥‥‥‥‥‥ 14
3.2.2 Rotating effect ‥‥‥‥‥‥‥‥‥‥‥‥ 15
4. Conclusions and Future works ‥‥‥‥‥‥‥‥‥‥‥‥ 18
References ‥‥‥‥‥‥‥‥‥‥‥‥ 20
국문 초록 ‥‥‥‥‥‥‥‥‥‥‥‥ 40Maste
드뷔시의 피아노 음악을 중심으로
학위논문 (석사)-- 서울대학교 대학원 : 디자인학부, 2017. 2. 김수정.음악과 시각 예술을 연결 짓기 위한 시도는 예술의 역사 안에서 다양한 형태로 이루어져 왔다. 수많은 예술가, 음악가, 기술자들은 시각과 음악 양쪽의 경계를 넘나들면서 음악의 형태적 구조를 다른 예술 분야에 적용하거나, 시각 예술로부터 얻어진 인상을 음악으로 연결 짓는 등 소리와 시각이 결합된 다양한 표현들을 시도해왔다. 본 연구자는 이러한 예술 활동들을 들여다보고 음악적 현상이 왜 시각적 현상으로 전이되는가에 대해 의문을 갖게 되었으며, 한발 더 나아가 음악의 내면적인 감정은 인간에게 어떻게 작용되며 그것을 어떻게 시각화할 수 있는지에 대해 생각하게 되었다. 그리고 그것을 양방향 동시적으로 표현할 수 있는 방법을 컴퓨터 프로그래밍을 통해 찾고자 했다.
본 연구자는 드뷔시의 음악으로부터 많은 영감을 받아왔으며, 특히 드뷔시의 음악을 들을 때 연상되는 생생한 시각적 움직임의 근원에 호기심을 갖게 되었다. 그래서 드뷔시의 생애와 작품 세계를 다각도로 고찰하고 그 이유를 추측해 보았으며, 그러한 드뷔시 음악의 특징을 시각적으로 구현할 수 있는 방법을 찾고자 했다.
연구 과정에서 본 연구자는 음악과 시각에 대한 일반적인 이론을 고찰하고, 음악과 시각예술이 연결되는 방식을 예술의 역사 안에서 들여다보았다. 그리고 기존의 음악 시각화에서 드러난 관점의 한계를 확인하고, 새로운 관점에서 음악과 시각을 연결 짓고자 했다. 그래서 우선 가장 특징적인 드뷔시의 음악을 선정하고 분석했으며, 음악의 외면적 표현이라는 관점에서 드뷔시 음악의 움직임을 재현할 수 있는 방법을 찾고, 음악의 내면적 표현의 관점에서 음악의 조화와 감정의 문제를 시각화할 수 있는 방법을 찾고자 했다. 그리고 이렇게 탐구된 연구 결과를 실제로 작품 제작에 기술적으로 적용한 과정을 상세히 기술하고자 했다.
본 연구는 드뷔시 음악의 연구를 통해서 얻어진 통찰을 바탕으로 음악을 움직임이라는 측면에서 바라보고자 했으며, 이러한 움직임이라는 연결고리를 통해 시각과 음악을 통합적으로 연결하고자 한 점에서 독창적인 의미를 지닌다. 무엇보다도 음악에서 느껴지는 감정이나 화음 또한 음악의 내면의 움직임으로 설정하고, 그 움직임을 시각적으로 표현하기 위한 방법을 제시했다는 점에서 시각 음악의 새로운 가능성을 보여준다. 이러한 연구 과정에서의 조형적 접근은 단순한 작품 제작을 넘어서, 음악 이해에 있어 보다 직관적인 연결점을 제공하며, 그에 따라 음악 연구의 새로운 방법론을 제시하기도 한다. 복잡한 음악 이론의 장벽을 넘어, 보다 쉽게 접근할 수 있는 음악 및 시각 표현 도구의 개발에 본 연구가 도움이 되길 바란다.1. 서론 1
1.1. 연구의 배경 및 목적 1
1.2. 연구 방법 및 범위 2
2. 음악과 시각 4
2.1. 감각과 지각 4
2.1.1 감각, 지각, 이미지 4
2.1.2 시각 5
2.1.3 청각 6
2.1.4 공감각 6
2.2. 소리와 음악 8
2.2.1 소리의 기본 요소 8
2.1.1 음악의 기본 요소 10
2.3. 음악의 시각화 12
2.3.1 음과 색채의 대응 12
2.3.2 현대 추상미술에 나타난 음악의 시각화 14
2.4. 음악과 시각의 동시적 연결 20
2.4.1 색채악기 20
2.4.2 실험 영화의 음악 시각화 21
2.4.3 뉴미디어의 음악과 영상 23
3. 드뷔시 25
3.1. 드뷔시 작품의 특징과 시대적 배경 25
3.1.1 드뷔시의 생애 25
3.1.2 드뷔시 활동 시기의 과학적 발견 28
3.1.3 드뷔시 활동 시기의 기술의 발전 29
3.1.4 상징주의 문학 31
3.2. 드뷔시 음악의 움직임 33
3.2.1 컴퓨터를 통한 드뷔시 음악의 접근 33
4. 작품 제작 36
4.1. 연구 과제에 관련된 이전 작품들 36
4.1.1 작품 36
4.1.2 작품 37
4.1.3 작품 39
4.2. 음악의 외면적 표현-공간적 움직임 41
4.2.1 분석 대상 음악: 41
4.2.2 파동과 아르페지오 43
4.2.3 파동의 상행 44
4.2.4 파동의 변형 46
4.2.5 파동의 해체와 글리산도 47
4.2.6 지속음의 움직임 48
4.2.7 지속음의 화음적 표현 50
4.3. 음악의 내면적 표현-화성적 움직임 51
4.3.1 음과 나선 51
4.3.2 화음의 밝음과 어두움 54
4.3.3 화음의 긴장과 이완 59
4.4. 작품 인터페이스 디자인 64
4.4.1 실험적 인터페이스 64
4.4.2 작품의 실행 화면 67
4.4.3 인터페이스를 위한 화성의 시각화 70
4.4.4 타임라인 72
4.4.5 73
4.4.6 74
4.4.7 75
4.4.8 77
4.4.9 드로잉 영역 79
4.5. 인터랙티브 구현과 작품 설치 81
4.5.1 사용 기술과 제작 환경 81
4.5.2 82
4.5.3 83
4.5.4 터치의 단계 85
4.5.5 터치의 세기 88
4.5.6 선율 드로잉의 구현 89
4.5.7 설치 사진 및 스크린샷 96
5. 결론 106
5.1. 연구의 의의 106
5.2. 추후 연구 방안 107
참고문헌 108
Abstract 110Maste
청년 가구 아동수당 수급이 사적이전에 미치는 영향
학위논문 (석사) -- 서울대학교 대학원 : 행정대학원 행정학과(정책학전공), 2020. 8. 권일웅.2018년 9월부터 시행된 우리나라의 아동수당 제도는 현재 가구별로 만 7세 미만 아동 1명당 월 10만 원의 금액을 보조하는 청년 가구 대상 복지정책이다. 본 연구는 아동수당 제도 시행 이후 아동수당 수급액이 증가함에 따라 사적순이전소득 규모 및 사적이전소득 발생 확률이 변화하는 양상을 검증하였다. 통계청의 가계동향조사 미시자료를 활용한 이중차이분석 결과, 하위·중위 소득분위에 속한 청년 가구는 아동수당 수급액이 증가함에 따라 사적순이전소득이 증가하였으며 그 증가 크기는 중위 소득분위보다 하위 소득분위에서 더 크게 나타났다. 한편 사적이전소득 발생 확률은 아동수당 수급액이 증가함에 따라 중위 소득분위에서만 유의미하게 감소하였다. 종합하면, 아동수당 제도는 하위 소득분위에 대해 실질적인 소득보전 효과를 달성하고 있으며, 노인 가구에 대한 기존 연구와는 달리 청년 가구는 일부 소득분위에서만 공적이전소득이 사적이전소득을 구축하는 양상이 나타나고 있다.Introduced in 2018, the child benefit system in South Korea supported families with children under 7 with the stipend of 100,000 won. While this policy began as a means-tested transfer scheme, it removed its eligibility criteria at the beginning of 2019. Applying a difference-in-differences approach to household survey data, this study examines the change in net private transfer and the probability of private income transfer as the stipend increased. While child benefits to households with high income crowded out net private transfer from other households, low- and middle-income households increased net private transfer as they received the benefits. The crowd-out effect of child benefits on the probability of private transfer has shown to be statistically significant only in middle-income households. This study concludes that the child benefit system in South Korea practically reduces the burden of low-income families, in contrast to the popular concern that public transfer may cause private transfer to crowd out.제 1 장 서론 1
제 1 절 연구 배경 1
제 2 절 우리나라의 아동수당 제도와 연구 의의 4
제 2 장 선행연구 8
제 1 절 공적이전소득이 사적이전에 미치는 영향 8
제 2 절 구축효과 추정과 내생성 문제 12
제 3 장 연구설계 15
제 1 절 연구 문제 및 가설 15
제 2 절 데이터 선정과 변수 설정 18
제 3 절 연구모형 및 연구방법 21
제 4 장 연구 결과 23
제 1 절 기초분석 결과 23
제 2 절 이중차이분석 결과 29
제 3 절 소득분위별 분석 결과 32
제 4 절 연구 결과 및 시사점 35
제 5 장 결론 42
참고문헌 45
Abstract 48Maste
Prevalence of Hyperuricemia and Its Association with Obesity in Korean Adults: Analysis Based on 2018 Korea National Health and Nutrition Examination Survey
Background: This study aimed to analyze the association between the prevalence of hyperuricemia and obesity in Korean adults.
Methods: The participants included 5,922 adults from the 2018 Korea National Health and Nutrition Examination Survey. We examined the relationship between obesity status and serum uric acid levels using a chi-square test and multiple logistic regression.
Results: There was an increase in the prevalence of hyperuricemia with higher body mass index (P<0.001 and P=0.003, respectively). Both male and female in a higher obesity class also had a higher odds ratio for the prevalence of hyperuricemia (P<0.001). This trend remained consistent after adjusting for all confounding factors. The obesity class III group was found to be associated with the highest risk of hyperuricemia.
Conclusion: In this study, we found that hyperuricemia was significantly associated with obesity in Korean adults. In a clinical setting, this finding presents objective data for more aggressive management and ultimate prevention of obesity.ope
Sirolimus-Embedded Silk Microneedle Wrap to Prevent Neointimal Hyperplasia in Vein Graft Model
We investigated the role of a sirolimus-embedded silk microneedle (MN) wrap as an external vascular device for drug delivery efficacy, inhibition of neointimal hyperplasia, and vascular remodeling. Using dogs, a vein graft model was developed to interpose the carotid or femoral artery with the jugular or femoral vein. The control group contained four dogs with only interposed grafts; the intervention group contained four dogs with vein grafts in which sirolimus-embedded silk-MN wraps were applied. After 12-weeks post-implantation, 15 vein grafts in each group were explanted and analyzed. Vein grafts applied with the rhodamine B-embedded silk-MN wrap showed far higher fluorescent signals than those without the wrap. The diameter of vein grafts in the intervention group decreased or remained stable without dilatation; however, it increased in the control group. The intervention group had femoral vein grafts with a significantly lower mean neointima-to-media ratio, and had vein grafts with an intima layer showing a significantly lower collagen density ratio than the control group. In conclusion, sirolimus-embedded silk-MN wrap in a vein graft model successfully delivered the drug to the intimal layer of the vein grafts. It prevented vein graft dilatation, avoiding shear stress and decreasing wall tension, and it inhibited neointimal hyperplasia.ope
Outcome of Extracorporeal Ventricular Assist Device for Cardiogenic Shock as a Bridge to Transplantation
Background: The extracorporeal ventricular assist device (e-VAD) system is designed for left ventricular support using a permanent life support console. This study aimed to determine the impact of temporary e-VAD implantation bridging on posttransplant outcomes.
Methods: We reviewed the clinical records of 6 patients with the Interagency Registry for Mechanically Assisted Circulatory Support (INTERMACS) profile 1, awaiting heart transplantation, who were provided with temporary e-VAD from 2018 to 2019. The circuit comprised a single centrifugal pump without an oxygenator. The e-VAD inflow cannula was inserted into the apex of the left ventricle, and the outflow cannula was positioned in the ascending aorta. The median follow-up duration was 8.4±6.9 months.
Results: After e-VAD implantation, lactate dehydrogenase levels significantly decreased, and Sequential Organ Failure Assessment scores significantly improved. Bedside rehabilitation was possible in 5 patients. After a mean e-VAD support duration of 14.5±17.3 days, all patients were successfully bridged to transplantation. After transplantation, 5 patients survived for at least 6 months.
Conclusion: e-VAD may reverse end-organ dysfunction and improve outcomes in INTERMACS I heart transplant patients.ope
Higher monocyte count with normal white blood cell count is positively associated with 10-year cardiovascular disease risk determined by Framingham risk score among community-dwelling Korean individuals
The cardiovascular disease (CVD) has been identified as a leading cause of premature mortality among middle-aged and elderly individuals globally. Inflammation plays an important role in aging and age-related diseases, such as atherosclerosis and CVD. White blood cell(WBC) count is an inexpensive, simple biomarker of systemic inflammations and includes several cell subtype counts, such as neutrophils, monocytes, lymphocytes, basophils, and eosinophils. However, which component of a WBC count has the ability to predict CVD remains controversial. The objective of this study was to assess the association between monocyte counts and 10 year-CVD risk among community-dwelling Korean individuals using the Framingham risk score (FRS). We studied a total of 627 participants aged over 30 years who underwent routine health examinations. The mean age of the study population was 48.1 ± 11.7 years, and 56.9% were male. In the multiple regression analysis, the independent contribution of monocyte count to Framingham 10-year CVD risk was 0.217 ± 0.092 (P = .018) after adjusting for confounding variables. We found that of the various WBCs, monocyte countis an independent predictor of CVD risk. Further larger-scale prospective cohort studies are warranted to determine these associations in the future.ope
The Association between Neutrophil to Lymphocyte Ratio and Development of Early Adenomatous Colon Polyps among Middle-Aged and Elderly Individuals in Korea
Background: Coloncancer is one of the main causes of mortality. Early adenomatous colon polyp is a precursor of colon cancer through the ‘adenoma-carcinoma sequence.’ Epidemiological studies suggest that the neutrophil to lymphocyte ratio can be one of useful inflammatory markers in clinical settings. This study aimed to evaluate the association between neutrophil to lymphocyte ratio and development of early adenomatous colon polyps.
Methods: This cross-sectional study retrospectively examined 960 middle-aged and elderly individuals aged ≥45 years who underwent colonoscopy in a health examination program. Multivariate logistic regression was used to analyze the association between neutrophil to lymphocyte ratio and development of early adenomatous colon polyps.
Results: Among the 960 subjects, the prevalence of early adenomatous polyps was 20.7% (n=199). The mean age, body mass index, number of current smokers, white blood cell count, triglyceride level, and number of subjects receiving hypolipidemic drugs were higher in the group with early adenomatous polyps than in the multivariate analysis, the odds ratio (95% confidence interval) for the development of early adenomatous polyps was 1.23 (1.01−1.50) with neutrophil to lymphocyte ratio increment after adjusting the confounding variables (P=0.037).
Conclusion: We found that the neutrophil to lymphocyte ratio was associated with the development of early adenomatous colon polyps among middle-aged and elderly individuals. Accordingly, this result suggests that regular monitoring of early adenomatous colon polyps may be useful among individuals with a higher neutrophil to lymphocyte ratio.ope
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