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류기정,한태곤,김태훈,Yoo, Ki-Cheong,Han, Tae-Kon,Kim, Tae-Hoon (사)한국토질및기초기술사회 2006 기술발표회 Vol.2006 No.-
국내 건설산업은 현재 기술보다는 수주위주의 경쟁이 치열함으로서 종합기술 수준은 세계 25위권, 기획.설계 능력은 선진국의 70% 수준에 불과한 취약한 기술경쟁 기반과 시공 중심의 생산구조를 갖고 있다. 이러한 건설부문의 문제점을 극복하고자 정부는 2015년까지 건설 기술력 수준을 선진국의 90%까지 끌어올리기 위해 건설 분야의 연구개발 투자규모 확대 등 다양한 계획을 추진 중에 있다. 본 고에서는 상기와 같은 상황 속에서 장차 미래사회에 있어 건설교통 분야의 기술발전을 이끌 도시성장, 인구변화, 에너지 및 자원 고갈, 기후변화 등 대응기술에 대한 연구개발사업계획을 소개하고, 국내 건설기술의 재도약의 일환으로 2006년을 기점으로 시작된 R&D 혁신로드맵의 체제와 그 의미를 소개하였다.
흙막이 가시설 차수공 기능 약화에 기인한 터파기 시공개선사례 연구
류기정(Yoo, Ki-Cheong),한태곤(Han, Tae-Kon),곽현석(Kwak, Hyun-Seok) 한국구조물진단유지관리학회 2010 한국구조물진단학회 학술발표회논문집 Vol.2010 No.2
The method of underground excavation is various with retaining wall by soil-condition, ground water level, cost, complaints. When the ground water level is high, the cut-off wall is considered preferentially additional methods for impermeability. The additional methods is used L.W, S.G.R, J.S.P. The effect of impermeability on these methods are different by solidified condition. also, the solidified condition is not easy to confirm. So. this study analyzes the cause that is reducing the effect of impermeability about L.W grouting on this field and presents the case of underground excavation under environment.
목질자재의 감쇠기간에 따른 TVOC 및 포름알데히드의 방출 특성 연구
김상식(Kim Sang-Sik),류기정(Yoo Ki-Cheong) 대한건축학회 2010 대한건축학회논문집 Vol.26 No.11
Construction materials used for a new building are complex substances wood materials and it is being investigated that they emit various chemicals such as Formaldehyde, TVOC, etc. and deteriorate the quality of indoor air. These toxic substances cause the symptom like Sick Building Syndrome(SBS) and Sick House Syndrome(SHS), etc. Therefore, this study examine the emission characteristic of Formaldehyde and TVOC based on the elapsed period for each grade for an effective improvement by selecting the typical wood materials(PB, MDF) that can affect the quality of indoor air as a target. Also, it investigated the emission ingredients of an individual VOCs substance and grasped the main pollution materials. As a result, PB and MDF of Formaldehyde and TVOC showed a different emission characteristic each other, and emission concentration of MDF was higher than PB. This is the kind of raw material and is grasp by the amount of adhesive. It is decided that elapsed period considering the characteristic of each raw materials is necessary because the emission concentration is different respectively like this. In addition, based on seven days, PB was emitted much in order of Toluene, 1,3,5-Trimethylbenzene, N-Pentadecane and MDF was emitted in order of N-pentadecane, Toluene.
김상식(Kim Sang-Sik),류기정(Yoo Ki-Cheong) 대한건축학회 2008 대한건축학회논문집 Vol.24 No.7
Recently, indoor air quality in a newly built apartment building has been reported to be in a dangerous condition. But, Building Materials are composed of very complex chemical compounds which emission very much VOCs. This study focused on the emission rate of the construction materials. The method of study is as follows. First, validation of small chamber method to determine emission rate of construction material was performed by Correlation Analysis(SPSS 12.0). Second, the construction materials were categorized by their feature and the emission rate of volatile organic compound was determined. Totally, VOCs emission rate of 147 materials were determined. On the basis of the measurement results achieved, we can estimate emission characteristic of the pollutant from finishing materials. In the present case of TVOC, detected VOCs is the subject of the study range from n-hexane to n-hexadecane, and there is a somewhat discrepancy with a practice hazard material due to converted total sum of each toluenes. So, it is needed to make a plan to regulate emission intensity of hazardous material individually that is detected a large amount except for non-hazardous or rarely detectable materials.
한유식(Yu shik Han),류기정(Ki Cheong Yoo) 한국방재안전학회 2017 한국방재안전학회 논문집 Vol.10 No.1
지표투과레이다 탐사에 있어서 지하매질의 전기적 특성 파악은 매우 중요하다. 지하매질의 전기적 특성에 따라 전자기파의 에너지가 상대적으로 작아져 경계면으로부터 반사가 어려워 질수 있다. 이 연구에서는 다양한(느슨하고 조립한) 조건의 모래지반에 대한 전기적 특성을 분석 한 결과, 마른모래에서는 상대밀도가 증가할수록 유전상수는 증가하였으며, 모래의 함수율이 증가할수록 유전상수와 전기전도도의 값은 증가 하였다. It is very important to understand the electromagnetic characteristics of underground media in GPR (Ground Penetrating Radar) survey. Depending on the electrical characteristics of the underground medium, the energy of the electromagnetic wave becomes relatively small, and reflection from the interface may become difficult. In this study, electrical characteristics of sandy soils under various (loose and dense) conditions were analyzed. As a result, In dry sand is the dielectric constant increased as the relative density increased, and the dielectric constant and electrical conductivity increased as the moisture content of the sand increased.
시간 경과에 따른 건축마감자재의 포름알데히드 및 VOCs 방출 특성 연구
김상식(Kim Sang-Sik),류기정(Yoo Ki-Cheong) 대한건축학회 2009 대한건축학회논문집 Vol.25 No.8
Indoor air pollution of a new building apartment house is known by the causes largest that Formaldehyde and VOCs flowed out at all kinds of finishing materials etc. In-progress a lot of researchers in order to decrease indoor air pollution by these pollutants. In this study, we inquire into a change of emission rate of each finishing materials after construction by progresses in time. We will derive from a reasonable management way regarding this. Indoor air pollutants from indoor finishing materials like wallpaper, wood flooring, paint, and bond were measured. Validation of small chamber method to determine emission rate of construction material was performed with the passage of time. The construction materials were categorized by their feature and the emission rate of VOCs was determined. On the basis of the measurement results achieved, we can estimate emission characteristic of the pollutant from finishing materials. In the present case of TVOC, detected VOCs is the subject of the study range from n-hexane to n-hexadecane, and there is a somewhat discrepancy with a practice hazard material due to converted total sum of each toluene. So it is need to make a plan to regulate emission intensity of hazardous material individually that is detected a large amount except for non-hazardous or rarely detectable materials. And even if time passes, Toluene is continuously detected. In accordance with, research to decrease emission rate of Toluene is necessary for an indoor air quality improvement of a long term.
굴착의 안정성에 미치는 영향인자 분석을 위한 전자기적 유전상수와 체적함수비와의 상관관계 분석기법 연구
한유식 ( Yushik Han ),손희정 ( Hee Jeung Sohn ),류기정 ( Ki Cheong Yoo ) 한국지구물리·물리탐사학회 2016 지구물리와 물리탐사 Vol.19 No.3
지반 굴착에 따른 지하수위 저하로 인해 발생되는 지반함몰 문제는 지하수 흐름에 대한 이해를 바탕으로 한 해석적인 접근이 필요하다. 이 연구에서는 실내 토질시험 결과를 이용하여 유전상수와 체적함수비 상관식에 대한 여러 경험식의 적합성을 비교 검토하였으며, 수치연산을 통해 GPR 탐사를 이용한 유전상수 추정방법에 대해 검토하였다. 사질 토 지반에 대해 굴착에 따른 침투해석과 응력-변형률 해석을 실시하였으며, 기존 실내실험 연구결과와 비교한 결과, 불포 화토에 대한 침투압을 고려한 응력해석 결과에서 불포화지반의 모관흡입력 값을 유사하게 예측하였다. In order to prevent ground collapses by groundwater level drawdown, we need to understand the groundwater flow and also make an analytical approach to the cause of the collapses. In this study, we used the result of the soil lab tests to compare and review the suitability of the various interaction equations about the relation between volumetric water content and the dielectric constant. In addition, using GPR (Ground-Penetrating Radar), we reviewed the possibilityof calculating an estimate of dielectric constant. Lastly, we applied seepage analysis and stress-strain analysis to the sandy ground given by ground excavation. In comparison with the previous result of the soil lab tests, we similarly predicted the suction of unsaturated soil from results of stress-strain analysis considered the seepage force for the unsaturated soil.
[제2분과/내진성능/교량/지반] 수치해석상 연약지반 성토관리 안정화 기법의 적용성
김태훈(Kim Tae-Hoon),한태곤(Han Tae-Gon),류기정(Yoo Ki-Cheong),이송(Lee Song) 한국구조물진단유지관리학회 2004 한국구조물진단학회 학술발표회논문집 Vol.- No.-
This study researched the behavior of embankment on clays to determine staged-heights of fill by not conventional method using critical fill height, hc=NeCu/r and the increase of strength during consolidation, but applying the methods of stability management to numerical analysis, and evaluated the various methods of stability management as comparing with measured results of pilot test. Also, the numerical program was developed to evaluate the various methods of stability management by FEM that modified Cam-Clay model was connected with Biot's consolidation theory.