데이터베이스 마케팅의 프라이버시 保護에 關한 硏究

학위논문(석사)--서울대학교 대학원 :경영학과 경영학전공,2000.Maste

Evaluation of Strength Characteristics and Weathering Grade on a Long Term Weathered Volcanic Rock

학위논문 (석사)-- 서울대학교 대학원 : 건설환경공학부, 2014. 2. 박준범.Recently increasing the road construction in according to development of national economy, high cutting slope is frequently constructed in order to get good road line. Rock slope is cut and exposed simultaneously at air pollution, it happens the reduction of strength while proceeding weathering. Even if we have many studies about weathering of granite and sedimentary rock, we don't have many materials of the study about weathering on volcanic rock. Therefore in this paper, when we plan the rock slope at volcanic rock, performing the weathering acceleration experiment, we tried to predict the change of rock parameter quantitatively on a long term weathering. we figured out the weathering minerals at volcanic rock presently through chemical sensitivity analysis , tried to suggest the quantitative weathering grade calculating the chemical index of weathering and chemical index of alteration. And we performed slaking durability experiment in order to figure out the durability of rock before-and-after weathering. We performed the experiment connected physical weathering index such as absorption, elastic wave velocity, coefficient of permeability, uniaxial compressive strength, joint surface shear test and tried to predict the change of the strength and permeability of rock quantitatively before-and after weathering. We observed the change of rock surface before-and-after weathering through the stereo microscope and scanning electron microscope analysis. The rock parameters from weathering acceleration experiment at volcanic rock are prepared the basic materials to be reasonable design and construction considering the weathering when we plan the real civil structuresAbstract…………………………………………………….ⅲ Contents of Figure………………………………………..…v Contents of Table ………………………………………….ⅶ Chapter 1 Introduction ...…………………………………...1 1.1 Background ...…..………………………………...……………..1 1.2 Aims of research and the methods ...……………………………4 Chapter 2 Theoretical Backgrounds ...……………………..8 2.1 Geotechnical characteristics of volcanic rocks ...……………….8 2.2 Weathering characteristics of rocks ...………………………….11 2.2.1 Introduction ...……………………………………………..11 2.2.2 Mechanical Weathering ...…………………………………13 2.2.3 Chemical and biological weathering ...……………………16 2.3 Weathering index and grade of rocks ...………………………..19 Chapter 3 Strength and Permeability Characterestics through Weathering Acceleration Experiments ...………..26 3.1 The geographical and geological features of the target region for this study ...……………………………………………………26 3.2 Sampling and sample molding ...………………………………28 3.3 The chemical weathering sensitivity experiment and analysis...29 3.3.1 Analysis of the weathered minerals through the X-ray diffraction(X-RD) ...………………………………………...29 3.3.2 Estimation of the weathering index through the whole rock analysis(X-RF)……………………………………………...32 3.3.3 Estimation of the chemical index of alteration (CIA) ...…...35 3.3.4 Estimation of the chemical weathering rate through the analysis of cation dissolution ...……………………...…..37 3.4 The mechanical weathering sensitivity experiment and analysis..40 3.4.1 The evaluation of slake durability ...………………………40 3.5 The weathering reduction experiment and analysis ..……….…42 3.5.1 Absorption rate test ..……………………………………...43 3.5.2 Uniaxial compression test ..………………………….……45 3.5.3 Measurement of the elastic wave velocities ..………..…....49 3.5.4 Permeability changes by permeability tests ..………..……52 3.5.5 Joint shear test ……………………………………….……57 3.6 Surface changes on rocks due to weathering ………………….60 3.7 Weathering grades by rock types based on the results of the weathering tests …………………………………………………66 Chapter 4 Conclusion…………………..………….68 References…………………………………………73Maste

열린충남 77호-[특집1]지방정부의 안전관리에 대한 신뢰와 불신

1. 문명의 역설 요즘 대기오염 분야에서 가장 큰 문제가 되는 것 중의 하나가 바로 미세먼지(Particulate Matter, PM)이다. 우리는 일상적 삶을 자신의 기대에 어긋나지 않을 것이라고 확신하며 산다. 태풍이 오기 전에 정부는 그 규모와 예상지역을 파악해 주민을 안전하게 대피시킬 것이라든가, 혹은 원전은 원자로 폭발사고나 심각한 방사능 누출사고 없이 안전하게 가동될 것이라든가, 유람선이나 버스는 목적지까지 승객을 안전하게 이동시킬 것이라든가, 건축물이 붕괴하여 지나가던 행인을 덮치지 않을 것이라든가 등, 우리는 주변에서 일어나는 일들을 나름대로 예측하며 살아가며, 또한 그 예측에 맞추어 행동한다. -이후 생략-1. 문명의 역설 2. 재난 제로(Disaster Zero) 대신에‘탄력적 도시(Resilient City)’로 3. 안전관리에 대한 신뢰와 불신의 구