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.

MJF 3D Printing 출력물의 내부 잔여 파우더 제거에 관한 비교 연구

이송원(S. W. Lee),박자연(J. Y. Park),김준석(J. S. Kim),여소희(S. H. Yeo),김민우(M. W. Kim) Korean Society for Precision Engineering 2022 한국정밀공학회 학술발표대회 논문집 Vol.2022 No.5

연질소재 3D Printing의 실패 원인 및 개선사례 분석

이송원(S. W. Lee),박자연(J. Y. Park),김준석(J. S. Kim),여소희(S. H. Yeo),김명훈(M. H. Kim),김민우(M. W. Kim) 한국기계가공학회 2021 한국기계가공학회 춘추계학술대회 논문집 Vol.2021 No.12

자기관리역량이 진로적응능력에 미치는 영향 -후기 청소년의 비교과활동을 중심으로-

이송이 ( Song Yi Lee ),심태은 ( Tae Eun Shim ) 한국가족복지학회 2016 한국가족복지학 Vol.21 No.1

The purpose of this study is to examine the correlation among non-subject activities, self-competence, and career adaptability for college students when developing their core capabilities. The subjects were 422 students of D university, who were surveyed with scales that measure these variables. 53.8% of the subjects were found to be female students and 46.2% were male. In terms of their majors, 35.3% were engineering, 18.3% were social science, and 13.8% were business. In respect to types of experience, 30.1% of students had volunteer experience, 11.3% had extracurricular experience, 15.4% had counseling experience with faculty members, and 20.6% had overseas experience. The results for the correlation between self-competence and career adaptability showed that systematic management by objectives, self-exploration, comprehensiveness and healthcare were found to have a positive correlation with concern, self control, curiosity and confidence. Volunteer experience, extracurricular experience, and counseling experience were found to have a significant correlation with students’ concerns for career adaptability, and extracurricular experience and counseling experience had a meaningful influence on the control of career adaptability. Extracurricular experience and counseling experience were found to have a significant correlation with students’ curiosity of career adaptability, and extracurricular experience and counseling experience had a meaningful influence on confidence in regards to career adaptability. Finally, volunteer experience, extracurricular activities, counseling experience with faculty and overseas experiences had an influence on career adaptability by the mediator variable of self-competence.

증례 : 순환기: 신장암 환자에서 Pazopanib을 사용한 후 발생한 심부전 1예

이송이 ( Song I Lee ),임병훈 ( Byung Hun Lim ),김영준 ( Young Jun Kim ),강상우 ( Sang Woo Kang ),박철 ( Chull Park ),송주흥 ( Joo Heung Song ),안선호 ( Seon Ho Ahn ) 대한내과학회 2016 대한내과학회지 Vol.90 No.4

신장암 환자에서 VEGFR-TKIs과 관련된 심부전은 드무나 생명을 위협할 수 있는 위험한 부작용으로 pazopanib으로 인한 심각한 심부전은 거의 없는 것으로 알려져 있다. 국내에서 pazopanib으로 인한 심각한 심부전에 대하여서는 보고된 바가 없다. 이에 저자들은 pazopanib 투여한 이후 발생한 심각한 심부전 1예를 경험하였으며 pazopanib 투여시 주기적인 심장기능 평가 필요성 및 증상 발현 시에 약물 중단을 통하여 증상 호전을 기대할 수 있어 이에 대하여 증례보고한다. A 78-year-old man was diagnosed with renal cell carcinoma, and left nephrectomy was performed. He started pazopanib. One month later, he visited our hospital because of general weakness and dyspnea. His oxygen saturation was low. A chest X-ray showed pulmonary edema and bilateral pleural effusion. An echocardiogram showed a larger left ventricle and lower ejection fraction than observed at the previous examination. The patient discontinued pazopanib and started diuretics and digoxin. His symptoms improved and a follow-up X-ray showed improvement in the pulmonary edema with bilateral pleural effusion. (Korean J Med 2016;90:330-333)

전시체제기 조선농촌재편성계획 구상과 실행(1940~1945년)

이송순 ( Song Soon Lee ) 고려대학교 역사연구소 2004 사총 Vol.59 No.-

6SC 기법을 활용한 FDM방식 3D프린터의 최적 출력환경 연구

이송연(Song-Yeon Lee),허용정(Yong-Jeong Huh),박종순(Jong-Soon Park),이준균(Joon-Kyun Lee) 한국산학기술학회 2015 한국산학기술학회 학술대회 Vol.2015 No.1

본 논문에서는 FDM(Fused Deposition Modeling) 방식의 3D 프린터로 제품을 출력할 때 열가소성 합성수지의 특성상 온도 차이에 의하여 제품이 휘는 현상이 발생하여 Bed에 제대로 붙지 않아 적층이 불안정하고 제품의 완성도가 떨어지는 현상이 나타난다. 따라서 적층이 안정적이고 제품의 완성도를 높이기 위하여 초기 적층 시 토출량을 증가해 적층하여 출력물과 Bed가 잘 붙게 한다. 하지만 출력 완료후에는 제품과 Bed의 분리가 쉽게 일어나야 하는데 본 논문은 FDM 방식의 3D 프린터 출력의 문제점을 6SC 기법을 활용하여 해결하였다.

Monocyte / Macrophage 전구 세포주를 이용한 Osteoclast 생성

이송철,임승길,김경래,이현철,허갑범 대한내과학회 1999 대한내과학회 추계학술대회 Vol.57 No.-

북한 구강의료의 시장화경향에 대한 심층분석

이송현,전정희,이기준 대한치과의사협회 2021 대한치과의사협회지 Vol.59 No.6

Currently the unofficial health care system is growing in North Korea as the socialist public free medical treatment system is not working properly due to the prolonged economic recession. In the Kim Jong-Un era, the North Korean government has been making investments in the medical sector recommending policies for the development of the health care system. Suggestions such as the establishment of a health care system and large scale hospitals have been discussed, but the public and private systems are unbalanced in all the medical segments where the private sector seems to be growing at a faster pace. Such examples would be the pharmaceutical supply and medical delivery systems. A survey of in-depth interviews with 53 North Korean defectors who resided at Hanawon, South Korea in 2020 revealed that dentistry, particularly the prosthetic sector, is recognized mostly as private paying care and is rapidly growing. Overall oral healthcare, including dental care, is provided in private facilities of dental care providers outside the current public healthcare system. The growth and demand for dental care is supported in that it is observed very few patients who had missing teeth had received prosthetic treatment before 2010, while nearly half of those with lost teeth received prosthetic treatments at a personal private cost after 2018. Through this research, it is evaluated there is a strong growing demand for dental care in North Korea, and unofficial private dental care is filling the need as the current government system is inadequate.

교통 빅데이터를 활용한 구간단속시스템 효과평가

이송하,박누리,박동혁,손승오,박준영,김덕녕 대한교통학회 2022 대한교통학회 학술대회지 Vol.86 No.-