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성토재료로 부적합한 현장 발생토의 토목섬유 보강효과에 관한 실험적 연구
홍용석(Young-Suk Hong),임종철(Jong-Chul Im),강상균(Sang-Kyun Kang),유재원(Jae-Won Yoo),김창영(Chang-Young Kim) 한국지반신소재학회 2018 한국지반신소재학회 논문집 Vol.17 No.1
양호한 성토재료는 현장에서 즉시 입수가 곤란하고 재료의 확보를 위한 추가적인 비용이 발생하여 각 현장에서는 현장 발생토를 직접 사용하는 경우가 많지만, 현장 발생토는 대부분 성토재료의 기준에 적합하지 않기 때문에 성토체의 안정성이나 강성을 확보하는데 어려움이 있다. 본 연구에서는 성토재료로 부적합한 흙의 다짐시 발생하는 문제점들을 개선하기 위하여 토목섬유를 보강하여 실내다짐시험과 현장다짐실험을 하였다. 실내다짐시험(KS F 2312)의 A, D다짐시험과 A다짐시험에서 다짐에너지와 토목섬유의 보강 층수를 다르게 하였고, 현장다짐실험은 함수비가 높은 현장 발생토에 토목섬유를 보강하고 다짐을 실시하였다. 그 결과, 실내다짐시험에서는 토목섬유를 보강함으로써 최적함수비는 감소, 최대건조밀도 증가하여 다짐곡선은 다짐에너지를 증가시켜 다짐한 경우와 비슷한 거동을 하였고, 건조밀도와 다짐에너지의 관계로부터 다짐에너지는 토목섬유를 1열, 2열 보강하였을 때 각각 평균 2.10배, 평균 2.71배 증가하여 토목섬유를 보강하고 다짐하면 큰 다짐에너지로 다짐한 것과 같은 효과로 더 효율적인 다짐이 가능한 것으로 분석되었다. 그리고 현장다짐실험에서 토목섬유를 보강함으로써 건조밀도는 증가하는 것으로 분석되어 다짐시 토목섬유를 보강하여 다짐을 실시하면 함수비가 높고 성토재료로 부적합한 현장 발생토를 사용하더라도 효율적인 다짐이 가능한 것으로 입증되었다. Surplus soil is commonly used at construction sites, because suitable fill material is not always immediately available and leads to additional costs. However, most surplus soils do not meet the requirement of suitable fill material to achieve the stability and strength of embankments. In this study, Proctor compaction tests and field compaction tests were performed by installing geosynthetics to resolve the problems caused by compacting unsuitable soils. Compaction energy and the number of geosynthetics were changed under the type A- and D- and type A Proctor compaction tests (KS F 2312), respectively. The field compaction testing using geosynthetics was performed on surplus soils of high water content. Optimum water content and maximum dry density of compacted soil decreased and increased by reinforcing geosynthetics, respectively. Compaction curves behaved with geosynthetics as the compaction curves behaved with higher compaction energy. Efficient compaction was possible because the compaction energy increased to 2.10 and 2.71 times the compaction energy required to achieve the same maximum dry density with one and two geosynthetic layer(s), respectively. Furthermore, field compaction tests verified that efficient compaction was possible because the dry density of unsuitable surplus soils of high water content was increased by reinforcing geosynthetics.
이호영(Lee Ho-Young),성남철(Seong Nam Chul),홍용석(Hong Young-Suk),윤동원(Yoon Dong-Won),손종열(Sohn Jong-Ryeul) 한국건축친환경설비학회 2010 한국건축친환경설비학회 학술발표대회 논문집 Vol.2010 No.10
Indoor Air Quality deterioration due to various environmental causes of disease that has already been identified by many case studies. In particular, children are easily exposed to danger on indoor air contamination. So, the indoor air quality management of the living space of children is very important. However, the indoor air quality management guideline of daycare facilities is insufficient to guarantee the health of children. The purpose of this study, child day-care facilities in 73 locations in the metropolitan area, indoor air quality survey and analysis to identify the status and aims to provide data to improve IAQ. As a result, 47 percent of facilities in the mechanical ventilation systems and air cleaners were installed. Known only to 26% for indoor air quality by responding to the survey that appeared to be a lack of awareness. as the following measuring result, contaminant of concentrations of the measured facilities are against the regulations which CO2 by 29%, PM10 by 42%, TVOC by 19%, HCHO by 6% and 37% for TBC was measured. Therefore, indoor air quality in child care through the improvement of the active response and sustained efforts are required.
두개저의 크기,형태 및 두부자세와 악안면구조의 위치적 상관관계
홍용석,조영곤,윤영주,김광원 朝鮮大學校 口腔生物學硏究所 1997 口腔生物學硏究 Vol.21 No.1
This study was done to evaluate the correlations between the size, the form of the cranial base, head posture and the horizontal and vertical position of craniofacial structures. For this purpose, 100 cephalometric radiographs were taken from the sample composed of 51 male and 49 female, 12 measurement criteria and 37 reference points were established and digitized, then calculation was performed for the values of measurement variables and the horizontal and vertical position of reference points. The correlations between them were analyzed statistically and mean facial diagrams were constructed and compared with the selected groups which were composed of 10 samples each as large and small group from the measurement value. The following results were obtained: 1. The angles N-S-BA and N-S-AR as variables for the form of cranial base correlated highly to the horizontal and vertical position of reference points in the cervical column with statistical significance (0.1% level). 2. The angles N-S-BA and N-S-AR as variables for the form of cranial base correlated to the horizontal position of the reference points in the facial structure with statistical significance (1% level), but not to the vertical position of them (5% level). 3. The length N-S, S-BA, N-BA and N-AR as variables for the size of cranial base were correlated to the position of craniofacial structures in various ways, but in general, highly correlated to the horizontal and vertical position of midfacial structures around the teeth and alveolar area. 4. The angle NSL/CVT and NSL/OPT as postural variables for the inclination of cranial base and cervical column were correlated to the horizontal position of the craniofacial structures with statistical significance (1% level), but not to the vertical position of them (5% level). 5. The angle OPT/HOR and CVT/HOR as postural variables for the inclination of cranial base and true horizontal line were not correlated to the horizontal and vertical position of the craniofacial structures with statistical significance (5% level). 6. The correlation between the measurement variables and horizontal and vertical positions of the reference points in soft tissue were shown as similar to the related hard tissue points.