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유주환,Yoo, Ju-Hwan 한국수자원학회 2018 한국수자원학회논문집 Vol.51 No.5
We calculated the optimal exponent values based on the hourly rainfall data observed in South Korea by treating the exponent value as a variable without fixing it as a square in the inverse distance method. For this purpose, rainfall observation stations providing the data are classified into four groups which are located at the Han river upstream, downstream, the Geum river upstream, and the Nakdong river midstream area. A total of 52 cases were analyzed for seven stations in each group. The optimal exponent value of distance was calculated in a case including one base station and four surrounding stations in a group. We applied the golden section search method to calculating this optimum values using rainfall data for 10 years (2004~2013) and verified the optimum values for the last three years (2014~2016). We compared and analyzed two results of the conventional inverse distance method and the inverse distance method in this study. The optimal values of distance exponent obtained in this study were 3.280, 1.839, 2.181, and 2.005 respectively, in the four groups, and totally mean value was 2.326. It is shown the proposed inverse distance method applying the optimal exponent is superior to the conventional inverse distance method. 역거리법에 포함된 지수 값을 제곱으로 고정하지 않고 변수로 취급하여 강수량 자료를 바탕으로 지수 값의 최적치를 산출하였다. 이를 위해서 한강 상류부, 한강 하류부, 금강 상류부, 낙동강 중류부 등 4개 Group으로 나누고 각 Group 내 7개 관측소에 대하여 총 52개의 Case를 분석하였다. 각 Group에서 기준 관측소 1개와 주변관측소 4개를 조합한 Case별로 거리 지수 값의 최적치를 구하였다. 이 최적치를 산출하기 위해서 황금비 분할조사법을 적용하였고 강수 자료는 10년(2004~2013년) 간의 시우량 자료를 사용하였다. 이와 같이 구한 최적치를 최근 3년(2014~2016년) 간에 대하여 검증하였다. 본 연구에서 구한 최적의 거리 지수 값은 4개 Group에서 평균적으로 각각 3.280, 1.839, 2.181, 2.005로 나타났고 전체 평균하면 2.326이었다. 그리고 최적의 지수 값을 적용한 역거리법은 지수 값을 제곱으로 한 기존 역거리법과 비교하여 우수함을 보였다.
2002년 루사로 인하여 송천 수위국을 붕괴시킨 이상 홍수량의 규모 결정
유주환,김주철,Yoo. Ju-Hwan,Kim. Joo-Cheol 한국방재학회 2003 한국방재학회논문집 Vol.3 No.3
2002년 태풍 루사의 집중호우로 금강 중상류에 위치한 초강천 유역에 막대한 홍수피해와 범람을 동반하였다. 발생한 홍수는 초강천 하류에 위치한 송천교에 부설되어 있는 송천 수위국을 잠식하여 붕괴시킬 정도로 엄청난 유량 규모를 가졌기 때문에 직접 측정할 수 없었다. 이에 본 연구에서는 매닝의 등류 공식을 이용하여 홍수량을 산정함과 더불어 적정한 조도계수를 제시하였다. An abnormal storm by the typhoon of RUSA in 2002th year was broken out with tremendous flood demages and inundations on the basin of Chogangcheon located in the upper middle part of Guem river`s upstream. This flood could not be engaged because it was so big that the stage engaging Songcheon station stuck to Songcheon bridge was destroyed by submerging. In this study the quantity of the flood was calculated by use of Manning`s equation and suitable roughness coefficient was suggested.
이상 호우에 의하여 붕괴된 수위국 지점의 홍수량 규모 결정
유주환,김주철,Yoo. Ju-Hwan,Kim. Joo-Cheol 한국방재학회 2008 한국방재학회 학술발표대회논문집 Vol.2008 No.1
An abnormal storm by the typhoon of RUSA in 2002th year was broken out with tremendous flood demages and inundations on the basin of Chogangcheon located in the upper middle part of Guem river`s upstream. This flood could not be engaged because it was so big that the stage engaging Songcheon station stuck to Songcheon bridge was destroyed by submerging. In this study the quantity of the flood was calculated by use of Manning`s equation and suitable roughness coefficient was suggested.
Poly(ethylene terephthalate)계 생분해성 섬유의 제조 및 특성
유주환,최영옥,Yoo, Joo Hwan,Choi, Yeong Og 한국섬유공학회 2012 한국섬유공학회지 Vol.49 No.6
PET-based biodegradable fibers were obtained using two-step process; (1) melt spinning at several winding speeds, and (2) hot-drawing at various drawing rates. Two kinds of polymers were used in this study and the fibers from them were characterized by several analyzing techniques such as tensile test, X-ray diffraction, scanning electron microscope, etc. At fixed extrusion rate, the mechanical properties of as-spun fibers were dependent on the winding speed. The higher winding speed resulted in the higher modulus and strength, and the lower elongation at break. At fixed drawing temperatures of rollers, the mechanical properties of the drawn fibers were also strongly dependent on the drawing rates. The drawn fibers showed the increased orientation upto 94% and breaking strengths of 4.2~4.8 g/d.
유주환,안다미로,김호동,Yoo, Joohwan,Ahn, Damiro,Kim, Ho Dong 한국섬유공학회 2013 한국섬유공학회지 Vol.50 No.4
The stab resistance of aramid fabrics reinforced with waterborne polyurethane (PU) resin is investigated by quasi-static and drop-tower stab tests. The effect of PU resin treatment and tumbling on the stab resistance is also evaluated by flexural stiffness and pull-out tests. To achieve maximum stab resistance, it is essential to control the movement of fiber bundles in the fabric structure. It is also found that the tumbling process is a useful way to improve the flexibility of treated fabrics.
2002년 루사로 인하여 송천 수위국을 붕괴시킨 이상 홍수량의 규모 결정
유주환,김주철,Yoo, Ju-Hwan,Kim, Joo-Cheol 한국방재학회 2003 한국방재학회논문집 Vol.3 No.3
2002년 태풍 루사의 집중호우로 금강 중상류에 위치한 초강천 유역에 막대한 홍수피해와 범람을 동반하였다. 발생한 홍수는 초강천 하류에 위치한 송천교에 부설되어 있는 송천 수위국을 잠식하여 붕괴시킬 정도로 엄청난 유량 규모를 가졌기 때문에 직접 측정할 수 없었다. 이에 본 연구에서는 매닝의 등류 공식을 이용하여 홍수량을 산정함과 더불어 적정한 조도계수를 제시하였다. An abnormal storm by the typhoon of RUSA in 2002th year was broken out with tremendous flood demages and inundations on the basin of Chogangcheon located in the upper middle part of Guem river's upstream. This flood could not be engaged because it was so big that the stage engaging Songcheon station stuck to Songcheon bridge was destroyed by submerging. In this study the quantity of the flood was calculated by use of Manning's equation and suitable roughness coefficient was suggested.