폐기물 매립지 바닥층의 고화토 포설시 동결/융해 현상에 관한 연구

이송,이재영,김흥석,Lee, Song,Lee, Jai-Young,Kim, Heung-Suck 한국지반공학회 2000 한국지반공학회논문집 Vol.16 No.1

본 연구에서는 바닥층을 점토포설의 대안으로 기존의 원지반 해성점토에 시멘트와 벤토나이트 및 고화재를 혼합한 새로운 고화처리토를 이용하여 안전하고 경제적이며 효율적인 매립지 바닥층을 조성하고자 한다. 그러나 매립지 바닥층의 시공에 있어서 고화처리토를 이용한 표층고화 처리층을 바닥층의 재료로서 사용하는데 토목역학적인 안전성에 대한 기술적 자료가 전무한 실정이다. 특히 고화처리토를 포설한 후 겨울철 동상에 대한 연구문헌 및 사례는 국내, 외를 막론하고 쉽게 찾아볼 수 없었다. 따라서 본 조사연구를 통하여 기초적인 자료를 수집하고 겨울철 조건하에 고화처리층의 동결/융해 현상에 대한 바닥층의 안전성 및 동상현상을 검토하여 설계 및 시공에 반영될 수 있도록 하였다.$^4),6),21),25)$ 또한 본 연구에서는 폐기물매립지 바닥층의 포설에 가장 중요한 실패 원인중 하나인 동절기에 동상에 따른 고화처리층의 동결/융해 현상에 대한 연구를 실시하여 향후 해안폐기물매립지 건설에 기술적으로 이바지 하고자 한다. 고화처리층은 지지력을 목적으로 하는45 cm의 고화토층과 차수를 목적으로 하는30 cm의 불투수층의 $P_A와\; P_B$층으로 구성되었으며 고화처리층 하부에는 30 cm의 지하수 배제층, 상부에는 60 cm의 침출수 집배수층으로 설계되었다. 결과적으로 동결깊이는 동일한 조건에서 인공강우를 고려한 실험에서 동결깊이가 증가하였으며 동상현상은 수mm정도 증가하였고 국부적으로 표면균열이 발생하였다. 이러한 결과로 볼 때 매립지 바닥층의 설계에서 고화처리토를 사용한 바닥층이 점토층으로 구성된 설계보다 더욱 신뢰할 수 있다고 생각할 수 있다. (이송 외 2인, 1999; 이송 외 3인, 1999)e experimental group who was exposed to the A-V media produced by the author showed the higher score of androgyny sexual role identity than the control group who didn′t watch the A-V program. 2) The experimental group showed the higher rate of the androgyny than the control group, On the other hand, their rate of the masculinity turned out to be lower than the latter group. 3) The experimental group didn′t show the difference of SAS score from the control group .In conclusion, "Our sexuality is Healthful" A-V program for sexual education brought about the significant change of sexual role identity of the middle school boys, but didn′t affect their attitude toward sexual activity.ypothesis 4: The 4th hypothesis that "There will be significant difference of the pulse rate just before surgery in the experimental group and control group"was supported(P= .004). The purpose of this research is to complement the existing researches on landfill bottom liners behavior during the periods of freeze and thaw. Landfill-related researches have been typically focused on small-scale soil samples that are often compacted under conditions different from those used in the field. Although these tests have been invaluable in clarifying the problem of freeze and thaw, extending the results of such experimental studies to prototype landfills are questionable. In this investigation, the author utilized a large scale laboratory simulation allowing inclusion of the field depth of the cover systems, layered soil profiles, rainfall simulation, a cold climate and boundary conditions similar to those encountered in the landfill. The soil materials were stabilized soils (mixed clays, cements, and minerals) instead of clays. The bottom liners are made up of drainage layer (30 cm), stabilized layer (75 cm), and leach collection layer (60 cm). The stabilized layers are made up of supporting layer (45 cm) and low permeable layer (30 cm) - consisting of $P_A\; and\; P_B$ layer. As a results, depths of penetration increased by about 2~5 more centimeters at rainfall simulated designs than those at no rainfall simulated designs (that is design 3, design 5 and design 7) - it increased by about 20mm/day in the bottom liners and frost heaves also increased it by a few millimeters. Also, a few cracks appeared partly. According to these results, we can surmise that the compacted stabilized soil is more reliable than the compacted clay liners for construction of the landfill liners.

Caffeoyl Amino acid C-terminal Modified Derivatives as Multipotent Cosmeceuticals

이송,곽선영,이윤식 한국공업화학회 2009 한국공업화학회 연구논문 초록집 Vol.2009 No.1

파쇄대가 있는 대단면 굴착지반의 강도정수 연구

이송,이규환,심민보,유오식 서울시립대학교 산업기술연구소 1998 산업기술연구소논문집 Vol.6 No.2

The characteristic of joint is to be filled with a clay in an opening of fault. Collapse accident that has occurred frequently throughout Seoul Gang-Nam district is related to the fault of gneiss. The purpose of this paper is to analyze in-situ strength parameter in the that has occurred a large displacement under construction with large section of underground excavation, and to revaluate in-situ strength parameter applied to design by comparing in-situ measuring data with soil test for the sample filled with joint and rock obtained at site. Empirical method, RMR method, method by direct shear test and method by back analysis were utilized to estimate strength parameter.

’99 대한토목학회 학술발표회 및 Civil Expo ’99 개최 보고

이송 대한토목학회 1999 대한토목학회지 Vol.47 No.11

SDH SHR 환경에서 SD / SF 프로토콜 설계 및 시뮬레이션 ( Design & Simulation of SD / SF Protocol in SDH SHR Environment )

이송,한성택,이균하 한국통신학회 1997 한국통신학회 학술대회논문집 Vol.16 No.3

플립드 러닝(Flipped learning)을 활용한 대학 프랑스어 문법 교수ㆍ학습 방법 연구

이송 한국외국어교육학회 2018 Foreign languages education Vol.25 No.1

Recently, there has been a growing interest in ‘Flipped learning,’ a learner-centered approach that introduces the paradigm of future education. The aim of this study is to introduce a new method of Flipped learning and to identify its applicability to French grammar class in universities by adequately responding to learners’ needs and expectations. In chapter 2, we examine the necessity of introducing Flipped learning in the teaching of French grammar in universities. In chapter 3, we present the teaching and learning process divided into three steps: pre-class, in-class and after-class. In the pre-class step, learners understand the basic concepts by watching a pre-class video, solve basic questions and prepare authentic materials for discussion. In the face-to-face class, learners ask more questions, engage in a variety of activities with the instructor or their peers, and discuss or lead grammatical conceptualization about contents. In the after-class step, learners complement their weaknesses and deepen their knowledge. The teaching of French grammar based on Flipped learning, compared to the traditional teaching method based on lectures, allows learners to actively engage in their own learning process, to have more opportunities to interact, to gain a deeper understanding of grammar and to improve self-directed learning skills.

창의·인성 교육을 실현하는 프랑스어 교수·학습 방법

이송 한국외국어교육학회 2015 한국외국어교육학회 학술대회 자료집 Vol.2015 No.-

사면·토류구조물의 사고사례 분석

이송,김주현,박형규 한국구조물진단유지관리공학회 2003 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.7 No.2

흙막이벽체의 변형해석에 관한 연구

이송,김성구 한국지반공학회 2008 한국지반공학회논문집 Vol.24 No.2

This paper analyzed the effects related to the difference of the geometrical shape of the ground excavation by comparing the displacements of the earth retaining wall of the strut resulting from the change of the excavation breadth B and the excavation length L, adopting the three dimensional FDM analysis. It appeared that the displacement of the earth retaining wall of the strut increases in accordance with the increase of L/B and it decreases as it becomes nearer from the center to the corner where the temporary structural system forms, and the wale member is closured because of the effects of the confining effect by the closure of the earth retaining wall and the wale member. This paper proposed a formula in which the results of three dimensional FDM analysis which considers the shape of the excavation plane can be obtained from those of two dimentional FDM analysis which does not consider the shape of the excavation plane. And the results of the formula were compared with those of the site instrumentation analysis.

팽이기초의 형상에 따른 특성 분석

이송,정대열,정효권,이무철 한국지반공학회 2008 한국지반공학회논문집 Vol.24 No.2

A soft ground improvement method is used for structures which are constructed on soft ground to decrease settlement and increase bearing capacity. The Floating Base Plate has been developed for such purposes. In this study, the load-settlement characteristics were investigated by numerical analysis on various Floating Base Plate shapes to select an optimum shape, different from the conventional shape. The selected optimum shape was used to perform plate bearing test and numerical simulations. It was found that the Floating Base Plate is very effective in reducing the settlement and increasing the bearing capacity.