• 한국의류산업학회지
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• 제14권4호
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• pp.635-640
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• 2012

In this study, thermoplastic urethane (TPU) coating yarns were prepared at various extruding temperatures. The fine structure and mechanical properties of resultant TPU coating yarns examined by the wide angle X-ray diffractometer (WAXD), differential scanning calorimetry (DSC), dynamic mechanical thermal analysis (DMTA), and tensile test. TPU coating yarns (prepared at extruding temperatures at $175^{\circ}C$) were confirmed as a stable fine structure that obtained excellent tensile strength and flexibility. The C samples prepared by optimized conditions made by TPU woven floor mat. The structure of the woven mat is $4{\times}4$ basket weave and have laminated with the EVA foam to obtained final TPU woven floor mat products. The resultant TPU woven floor mat was obtained to 1.5MN of tensile strength, 22% of the elongation, and 0.2MN of tear strength. The weight loss abrasion and the resilience by the ball rebound of the TPU-woven floor mat was prior to those of the PVC subsequently, we were able to develop a woven floor mat with TPU coating yarn and produce an eco-friendly high valuable woven floor mat using an interior product.

• 한국조경학회지
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• 제28권1호
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• pp.54-61
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• 2000

Covering rate, visual rating and sod development were evaluated under three natural fiber materials with Phragmites spp. when over a plastic sheet. The results were as follows. (1) The last covering rate was high on jute net, coir mat and on Miscanthus sacchariflorus, respectively while the early covering rate was high on coir mat and on Miscanthus sinensis+perennial ryegrass. (2) The early growth was good on perennial ryegrass but the covering rate gradually turned poor because of summer drought. (3) Sod was highly developed on Phragmites japonica, Miscanthus sacchariflorus and Miscanthus sinensis compared with other species and mixtures. (4) The covering rate and visual rating were high on natural fiber materials such as coir mat and jute net when compared with on natural fiber materials such as none treatment plots. (5) The natural fibers materials on Phragmites spp. and Miscanthus spp. were effect on sod establishment. Sod coir mat was highly established. (6) The carpet-type sod was best developed on the coir mat.

• 한국건축시공학회지
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• 제1권2호
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• pp.185-190
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• 2001

The purpose of this study is the development of practical Dry floor tile unit method that settle the defect of a wet method and designed for resin mat. With use of PE resin which is confirmed the basic property, it is developed that resin mat, joint-sealing compound with fixed form and space management to Dry floor tile unit method. The result of this study is below. 1) To acquire above the 4kgf/$\textrm{cm}^2$ - construction specification criterion, the bonding space that between resin mat and tile has to occupy the 50% of resin mat module space(10,000$\textrm{cm}^2$). 2) Criteria of bonding part plane is below. simpleness of metal form. productivity, uniform quality after injection molding cooling, easy cutting for remain space management, adhesive property, construction ability, transformation of a severed piece under pressure and so on. 3) To get the shape that could protect the interfacial breakdown, it is designed that resin mat and tile are unified after the bond input. 4) Adapted joint-sealing compound is the material of urethane kinds wedge form. Resin mat has the water passageway that could drain the water. 5) To manage the severed piece of tile, the resin mat is likely to divide the half and the quarter and the plastic drainage is developed in the severed piece.

• 한국환경복원기술학회지
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• 제4권4호
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• pp.25-35
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• 2001

This study aims to find out the growth characteristics of riparian plants on the artificial floating islands (AFI). Three types of experiments were performed. The vegetation growth were compared by the plant-supporting materials; natural cotton mat, coir mat on the AFI or in the water, and natural soil at the waterfront. Major findings are; 1. The survival rate of riparian plants was 100% on both coir-mat and cotton-matislands, which implies that we may substitute cheaper cotton for expensive coir-mat. 2. Both natural cotton mat and coir mat were good for the growth of plants. Especially, the natural cotton mat was good for Sparganium stoloniferum and Miscanthus sacchariflorus, and the coir mat was good for Typha latifolia. 3. The growth rate of stem and root showed difference between the stem-removed plants and stem-remaining plants. As a whole, the growth rate of stem-removed plants was bigger than the one of stem-remaining plants. 4. The growth rate of plants showed difference between those grown on the AFI and those grown in the water. The growth rate of plant on the AFI was bigger than the one in the water. 5. The growth rate of plants on the AFI was bigger than the one on the natural soil at the waterfront.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2003년도 학술.기술논문 발표회
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• pp.1-4
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• 2003

Recently, a structure has been larger and higher under the improvement of construction technique. So, a concrete constructions that a mat foundation thickness of structure is over 80cm have been many. Also, because of the reason high strength concrete, the matter of thermal crack have become an important task to be solved absolutely. In a cause a thermal crack occurrence, there used, mixture of concrete, construction and so forth. In this study, we executed temperature and stress analysis of mat foundation to know the effect the construction condition a thermal crack of mat foundation. And we evaluated quantitatively about the occurrence possibility of thermal crack using the hydration heat analysis program. By using of this analysis technique, will can control skilfully the quality of a mat foundation in advance.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2003년도 학술.기술논문발표회
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• pp.1-4
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• 2003

Recently, a structure has been larger and higher under the improvement of construction technique. So, a mass concrete constructions that a mat foundation thickness of structure is over 80cm have been many. Also, because of the reason of high strength of concrete, the matter of thermal crack have become an important task to be solved absolutely. tn a cause of a thermal crack occurrence, there are material used, mixture of concrete, construction condition and so forth. In this study, we executed temperature and stress analysis of mat foundation to know the effect of the construction condition on a thermal crack of mat foundation. And we evaluated quantitatively about the occurrence possibility of thermal crack using the hydration heat analysis program. By using of this analysis technique, we will can control skilfully the quality of a mat foundation in advance.

• 한국물환경학회지
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• 제26권1호
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• pp.44-51
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• 2010

A lab-scale apparatus for turbid water transport control was tested and examined. The channel had a dimension of $100cm{\times}30cm{\times}15cm$ (length${\times}$hight${\times}$width). And the turbidity water was prepared using two types of particles, bentonite and loess. The channel equipped with filamentous mat was operated under various shock load conditions. In the control channel, instantly, turbid water mixed with the clean water inside the channel and turbidity prevails the entire channel. While in the mat-equipped channel, it increases only at the bottom. Overall, the filamentous mat gave capture efficiency of 70~90% compared with the control group. The capture efficiency of turbid particles decreased with increased input turbidity flux. The result of experimental run on how turbid particles are separated in the mat channel shows that settling, filtration and attachment are the main processes. Meanwhile, turbidity was diffused from the channel bottom due to turbidity gradient before and after mat zone. The particle size before mat zone was lightly coarser than that after mat zone.

• Weed & Turfgrass Science
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• 제4권1호
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• pp.18-25
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• 2015

DNA 바코드는 게놈 DNA의 단편을 이용해 형태적 지식없이 종을 동정하는 방법으로 전 세계적으로 최근에 많이 이용하고 있으며 고등식물에서는 엽록체 rbcL과 matK 유전자를 이용하고 있다. 본 연구에서는 표준 식물 바코드마커와 핵 ITS 부위를 이용하여 국내 포아풀아과 잡초 16속 29종 163생태형의 바코드 데이터를 생산하는 것을 목적으로 하였다. 더불어 포아풀아과의 바코드에서 각 마커의 효율성도 조사하였다. 바코드 결과 PCR 증폭과 염기서열 분석성공률은 rbcL에서 가장 높았으며 matK에서 가장 낮았다. 반대로 바코드 갭은 matK에서 가장 높은 반면 rbcL에서 가장 낮았으며, 종 식별 해상력은 matK에서 가장 높고, ITS에서 가장 낮았다. 그러나 바코드 갭과 종 식별 해상력이 가장 높은 matK를 포아풀아과에서 바코드 마커로 이용하는 것은 너무 낮은 PCR 증폭과 염기서열 분석성공률(58.3%) 때문에 고려해야할 것으로 생각된다. 단일마커로 rbcL과 ITS는 포아풀아과의 바코드에 적절하게 이용될 수 있으며, 두 마커를 조합으로 이용하면 공통으로 분석된 샘플에 따라 바코드 갭과 종 식별 해상력을 높일 수 있었다. 포아풀아과의 바코드데이터는 미국의 국립생물공학정보센터에 기탁하여 genbank 번호를 부여받아 공개하였다.

• 한국건축시공학회지
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• 제17권1호
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• pp.63-72
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• 2017

태양 복사가 콘크리트 매트기초 내부 온도 분포에 미치는 영향에 대한 해석적 연구를 수행하였다. 태양복사량 산정을 위해 Zhang and Huang 모델을 사용하였다. 열전달 방정식과 Galerkin 방법을 이용하여 1차원 열전달 유한 요소 정식화를 수행하였으며, MATLAB을 사용하여 유한요소 해석코드를 작성하였다. 작성된 해석코드를 바탕으로 태양복사를 고려한 콘크리트 매트기초의 수화열 해석을 수행하였다. 해석결과, 태양복사가 매트기초 내부-표면부 최대온도차를 줄여주는 효과를 보임을 확인하였다. 또한 이러한 효과는 하절기 타설시, 콘크리트 초기온도가 클수록, 그리고 매트기초의 두께가 두꺼울수록 더욱 뚜렷해짐을 확인 하였다. 본 연구는 콘크리트 매트기초의 수화열 해석시 해석결과의 과대평가를 피하기 위해서 태양 복사의 영향을 고려해야 함을 권고한다.

• 식물분류학회지
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• 제44권1호
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• pp.51-58
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• 2014

한국산 향나무절 식물에 대한 계통학적 유연관계를 규명하고, 더불어 향나무속 및 향나무절의 계통 및 유연관계를 잘 나타낼 수 있는 분자마커를 찾아내고자 분자계통학적 연구를 수행하였다. 엽록체 DNA matK와 psbA-trnH를 분자마커로 활용하였으며, 두 유전자의 조합분석결과 향나무절이 100%의 BP로 지지되는 분계조를 이루었다. 눈향나무+단천향나무 분계조와 향나무+섬향나무+뚝향나무 분계조는 각각 91%, 100%의 BP로 지지되었다. 따라서 한국산 향나무절은 (1) 눈향나무+단천향나무, (2) 향나무+섬향나무+뚝향나무 두 개의 분계조로 구분하는 것이 가장 적합할 것으로 생각되고, 본 연구에서 이용된 두 개의 분자마커 중 matK가 psbA-trnH 보다 향나무속 및 향나무절의 계통 및 유연관계를 규명하는데 다소 높은 해상력을 나타내었다.