火山土로부터 分離한 Streptomycetes의 多相的 分類

Thesis (doctoral)--서울대학교 대학원 :미생물학과,1996.Docto

Basin-fill sequences and evolution model of the Cretaceous Kyokpo Basin, Southwest Korea

Based on facies distribution, architecture and correlation of depositional sequences, three stages of basin evolution are reconstructed (Fig. 1). Stage 1 is represented by thick coarse-grained deposits in the lower succession that form subaqueous breccia talus and steep-sloped gravelly delta systems along the northern and southern basin margins, respectively, and a sandy subaqueous fan system inside the basin, abutting against a basement high. This asymmetric facies distribution suggests half-graben structure of the basin and the thick accumulation of coarse-grained deposits most likely reflects a rapid subsidence of the basin floor due to fault movements in the basin margins during the transtensional opening of the basin. Stage 2 is marked by sandy black-shale deposits in the upper part of the lower succession. The black shale is well correlated across the basin margins, indicating a basinwide transgression probably due to large-scale dip slip suppressing lateral slip component on the basin-bounding faults. Stage 3 is characterized by retrogradationally stacked, gravelly delta-lobe deposits and sandy black shales in the upper succession. The delta-lobe deposits are smaller in dimension and located more basinward than the deposits of marginal systems of the lower succession. This lakeward shift of depocentre is suggestive of loss of accommodation in the basin margins and quiescence of fault movements. This basin evolution model suggests that the rate of dip-slip displacement on basin-margin faults can be regarded as the prime control for determining stacking patterns of basin fills. The resultant basinwide fining-upward sequences deviate from the coarsening-upward cycles of other transtensional basins and reveal the variety of stratigraphic architecture in strike-slip basins controlled by the changes in relative sense and magnitude of fault movements in the basin margins.1

역사기록을 이용한 건축문화재 지진위험도 평가

학위논문 (석사)-- 서울대학교 대학원 : 건축학과, 2015. 2. 박문서.The disaster prevention researches about seismic hazard has significantly increased due to huge casualty of human-beings and property damage since the 2010 earthquake in Haiti and the 2011 earthquake in Japan. Although the occurrence of earthquake is relatively low in Korea, preparation is required due to increase frequency and scale of earthquake. However, available researches on earthquake prevention are mainly focused on modern architecture involved in Casualties. This research is focused on earthquake disaster. Earthquake characteristic is unpredictable and damage of earthquake widespread and destructive. So most countries located in earthquake hazard area protect building, infrastructure and life. In Korea, It is located in adjacent areas of plate boundary that is dangerous area about earthquake. That`s why protection about earthquake is needed in Korea. Architectural heritage have a lot of benefits such as historical value and academic value. That`s why It should be preserved from any dangerous factor especially natural disaster. In Korea, preparations for earthquake are only focused on building and infrastructure and research scope on the prevention of architectural heritage is yet to be reached. Effective preparations against earthquake build system. It helps manage process because of lack of manager. So this research is proposed risk assessment process and system framework for effective preparations. In this research, seismic risk assessment and building system for management of architectural heritage is aimed. Seismic risk of architectural heritage was calculated using a data from soil investment and a fatigue factor calculated by historical earthquake data and maintenance records both from architectural heritage. Seismic risk is suggested on the basis of four levels, and system for managing architectural heritage about earthquake through GIS is built.Chapter 1 Introduction 1 1.1 Research Background and objective 1 1.2 Problem Statement 3 1.3 Research Process 4 Chapter 2 Literature Review 6 2.1 Seismic Risk 6 2.2 Architectural Heritage Fatigue 8 2.3 Architectural Heritage Management over Seismic Hazard 10 2.4 Commercialized Seismic Risk Assessment System 12 2.5 Summary 14 Chapter 3 Evaluation of Seismic Risk on Architectural Heritage 15 3.1 Evolution of Seismic Risk on Architectural Heritage 15 3.2 Ground Attenuation and Amplification 17 3.3 The Level of Seismic Risks 20 3.4 Results of Seismic Risks Assessment 23 3.5 Summary 26 Chapter 4 Seismic Risk Assessment System 27 4.1 Composition of System Input Data 27 4.2 System Framework 29 4.3 Method of Expressing Seismic Risk 33 4.4 Validation of Risk Assessment using System 39 4.5 Verification of System Usability 41 Chapter 5 Conclusion 42 Reference 44 Appendix 49 Abstract (Korean) 52Maste

합성아미노산 및 에너지 공급원의 종류가 조기이유자돈의 성장에 미치는 영향

Thesis (doctoral)--서울대학교 대학원 :동물자원과학과 영양학전공,1997.Docto

Automatic Generation of a SPOT DEM: Towards Coastal Disaster Monitoring

A DEM(digital elevation model) is generated from a SPOT panchromatic stereo-pair using automated algorithms over a 8 km × 10 km region around Mokpo city. The aims are to continue the accuracy assessment over diverse conditions and to examine the applicability of a SPOT DEM for coastal disaster monitoring. The accuracy is assessed with respect to three reference data sets: 10 global positioning system records, 19 leveling data, and 1:50,000 topography map. The planimetric error is 10.6m r.m.s. and the elevation erroer ranges from 12.4m to 14.4m r.m.s.. The DEM accuracy of the flat Mokpo region is consistent with that over a mountainous area, which supports the robustness of the algorithms. It was found that coordinate transformation errors are significant at a few meters when using the data from leveling and topographic maps. The error budget is greater than the requirements for coastal disaster monitoring. Exploiting that a sub-scene is used, the affine transformation improves the accuracy by 50% during the camera modeling.33Nkciothe

한국 남서부 격포리층(백악기)의 퇴적과정과 퇴적환경

Thesis (doctoral)--서울대학교 대학원 :지구환경과학부,2000.Docto

Baseline-Free Crack Detection in Steel Structures using Lamb Waves and PZT Polarity

A new methodology of guided wave based nondestructive testing (NDT) is developed to detect crack damage in civil infrastructures such as steel bridges without using prior baseline data. In conventional guided wave based techniques, damage is often identified by comparing the “current” data obtained from a potentially damaged condition of a structure with the “past” baseline data collected at the pristine condition of the structure. However, it has been reported that this type of pattern comparison with the baseline data can lead to increased false alarms due to its susceptibility to varying operational and environmental conditions of the structure. To develop a more robust damage diagnosis technique, a new concept of NDT is conceived so that cracks can be detected without direct comparison with previously obtained baseline data. The proposed NDT technique utilizes the polarization characteristics of the piezoelectric wafers attached on the both sides of the thin metal structure. Crack formation creates Lamb wave mode conversion due to a sudden change in the thickness of the structure. Then, the proposed technique instantly detects the appearance of the crack by extracting this mode conversion from the measured Lamb waves even at the presence of changing operational and environmental conditions. Numerical and experimental results are presented to demonstrate the applicability of the proposed technique to crack detection.This work was supported by the National Science Foundation under grants CMS-0529208 and the Pennsylvania Infrastructure Technology Alliance (PITA), a partnership of Carnegie Mellon University, Lehigh University and the Commonwealth of Pennsylvania Department of Community and Economic Development. The authors like to acknowledge Dr. S. Liu for the NSF support and Prof. Gary K. Fedder for PITA support.

Intelligent interpolation methods for automaticgeneration of an accurate digital elevation model

본 발명은 정밀한 수치표고모형의 자동생성을 위한 보간법(補間法)에 관한 것으로서, 더 상세하게는 인공위성영상, 항공영상, 지상측량 등을 사용하여 3차원 수치표고모형을 자동 제작하는 지능적 보간법에 관한 것으로,종래보간법 결과(101)에 의해 정합 지역의 가장자리에 인위적으로 발생한 육지를 COG값이나 ECI값을 일정한 역치값과 비교하여 역치값보다 클 경우 제거하는 제1과정(102)과, 상기 제1과정(102)에서 보간된 영역을 선택하고 선택된 영역의 면적을 기준으로 사용하여 보간된 표고의 제거여부를 결정하는 제3과정(103)과, 상기 제1과정(102)에서 보간되지 않고 남은 영역을 선택하고 선택된 영역의 면적을 기준으로 사용하여 제거된 표고의 복원여부를 결정하는 제2과정(104)을 포함하여 구성됨으로써,해안 등 표고가 존재하지 않는 지역, 표고를 가져야 할 지역이지만 가장자리가 폐쇄되지 않은 강 등의 지역에서 정밀한 수치표고모형을 생성할 수 있는 효과가 있는 것이다.Center-of Grvity, Empty-Center-Index, 잡음제거 영역분할, 공백메우기 영역분할

Fabrication of composite material with 3D network structure of TiN and its properties

MasterAISI 316L stainless steel reinforced with 3D networked TiN was developed in order to enhance its endurance at elevated temperature. The composite material has been fabricated by mixing the powders of constituents, followed by heat treatment in vacuum and rolling process which are required to reduce void fraction. It should be emphasized that the fabricated composite was successfully reinforced by TiN mainly because of its unique 3D networked morphology which is obviously distinguished from common reinforcing materials with the form of particles or fibers. This structure was formed by separation of powders due to large size difference between 316L stainless steel powder and TiN powder. In this study, we confirmed that this composite material maintains its shape in the molten steel up to 100˚C above the melting temperature of the matrix of 316L stainless steel. Because 3D network structure of TiN acts as a reservoir of the matrix. Also, we studied the effect of heat treatment and dipping in molten steel on the matrix and 3D network structure. Finally, the mechanical properties of materials measured by the bending test and the hardness test were evaluated