Behavior Analysis on Earthquake-Induced Deformation of Structure and Ground Considering Soil Drainage Condition

In this study, according to drainage condition(undrained and drained) in soil, the settlement and horizontal displacement of caisson quay wall and apron in Youngilman port were estimated which was occurred due to earthquake-induced excess pore water pressure with the magnitude of 5.4 earthquake in Pohang on November 15, 2017. In general, seismic response analysis was carried out under undrained drainage condition, but in this study, drain drainage analysis was conducted to estimate displacement during earthquake as well as an additional displacement due to dissipation of excess pore water pressure after earthquake. These results of after earthquake can not be known under undrained drainage condition. Results clearly showed that the behavior of structure and ground was dependent on drainage condition in soil. Especially, based on the drained drainage condition, the additional displacement was clearly detected due to dissipation of excess pore water pressure after earthquake. Which indicates that both results are different from drainage condition in soil, and therefore, drained condition analysis is necessary to accurately estimate the behavior of ground and structure in seismic response analysis.List of Tables................................ⅲ List of Figures...............................ⅳ Abstract.......................................ⅵ 1. 서 론 1.1 연구배경..................................1 1.2 연구목적..................................5 2. FLIP 모델 이론 2.1 Multi-spring model..................7 2.2 Cocktail-glass model................11 2.3 액상화 파라미터.........................17 2.3.1 비배수조건.............................17 2.3.2 배수조건................................18 3. 기존 연구 : 비배수조건 해석 3.1 수치해석모델..............................23 3.2 해석 결과...................................26 4. 해석 방법 4.1 연구대상지역 및 지진...................30 4.1.1 영일만항..................................30 4.1.2 포항 지진.................................33 4.2 수치해석모델...............................37 4.3 지반정수.....................................41 4.4 액상화 파라미터 결정....................44 4.4.1 비배수조건...............................44 4.4.2 배수조건...................................44 5. 해석 결과 5.1 모델 전체의 변형...........................46 5.2 과잉간극수압................................48 5.3 구조물의 수평 변위........................55 5.4 구조물의 침하...............................64 5.5 지반의 침하...................................71 6. 결론 6.1 현장조사 및 선행 연구 결과와의 비교..77 6.2 지반배수조건에 따른 결과의 비교.......79 참고문헌...............................................80 감사의 글..............................................83Maste

Poverty or Affluence of Educational Theory

이 논문은 우리 교육학의 방법론에 관한 비판적 논의를 다루고 있다 .우리 교육학은 그동안 눈부신 외형적성장과 풍요에도 불구하고 ,그 연구 방법론은 아직도 답보적인 상태에 있으며 그것도 타학문의 방법론을 답습하거나 차용하는 수준에 머물러 있다 .특히 이미 방법론에 관한 논쟁에서 그 한계가 드러난 지 오래인 논리 실증주의 과학철학에 기초한 과학주의적 방법론의 폐쇄성에서 벗어나지 못함으로써 그 학문적 빈곤성을 드러내고 있다 .바로 이러한 문제의식에서 ,이 논문은 교육학의 성격 규명을 위해 ,우선 과학의 의미와 성격을 2세기 물리학의 발전에 따른 신과학 의 관점에서 재조명하였다 .그리고 그러한 새로운 패러다임의 과학관이 연구방법에 주는 시사점을 수용함으로써 교육학 연구의 지평을 확대할 수 있는 새로운 교육학 파라다임의 가능성을 모색하고자 하였다 . T* Professor, Kyung-in national university of educationhis thesis is critical reconsideration of methodological assumption of educational theory in Korea. In the last century, educational theory in Korea has been developed and accomplished very much in quantity, but it has revealed poverty in theoretical perspectives because of its methodological restriction. Its empirical scientistic methodology based on the logical positivism is old, rigid paradigm of science which is derived from Newtonian physics. This paper discusses the necessity and possibility of new methodology of educational theory based on the paradigm of 'new science' which is developed by new physics in 20th century. It is on the belief that it should enrich theoretical properties of education and education is to be a main subject of human science or science of human life

무선 센서 망에서의 효율적인 데이터 수집

학위논문(석사)--서울대학교 대학원 :전기·컴퓨터공학부,2004.Maste

컴퓨터 단층 촬영을 통한 하치조신경 손상 위험성 평가의 효용성

학위논문 (석사)-- 서울대학교 치의학대학원 : 치의학과, 2013. 2. 서병무.Purpose : The aims of this study were to evaluate the incidence of inferior alveolar nerve (IAN) injury and various risk factors of IAN damage, and to assess the efficacy of CT on the evaluation for risk factors of IAN damage after lower third molar removal. Patients and Methods : This study included total 735 patients who underwent surgical procedures for the 3rd molar extraction between January 2000 and August 2009 and total number of teeth was 1058 lower third molars. Among them, 271 teeth were additionally examined by dental computed tomography (CT). The prediction variables for IAN damage such as age, Pederson difficulty index, radiographic risk signs through panoramic view or CT scan were evaluated statistically, and sensitivity, specificity, positive predictive value, and negative predictive value were calculated about each radiographic risk sign. Results: Total 5 cases (0.5%) out of 1058 lower third molar extraction cases showed symptoms of IAN damage after surgical procedures. Patient age, darkening of root on panoramic radiograph, and contact or intrusion of root into IAN on CT scan may be related with IAN damage after extraction, but the incidence of IAN damage is too low to verify statistical significance. Pederson difficulty index seems not reliable prediction factors for risk evaluation of IAN injury. The presence of risk sign(s) on CT scan had positive predictive value of 0.4%, and absence of these had a negative predictive value (99.3%). Conclusion: The incidence of persistent (over 6 months) and temporary (less than 6 months) IAN damage is 0.2%, 0.3% respectively. Although usefulness of CT scan as a positive predictor is limited due to very low incidence of IAN damage, preoperative CT scan seems to be an efficient approach of negative prediction for risks of IAN damage during lower third molar extraction.Introduction Patients and Methods Results Discussion Conclusion ReferenceMaste