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남동호(Nam, Dong Ho),하헌중(Ha, Hern Joong),김병식(Kim, Byung Sik) 한국방재학회 2020 한국방재학회논문집 Vol.20 No.1
Due toclimate change, the average temperature of the Earth continues to increase, while abnormal climate patterns (such as El Niño and La Niña) occur frequently, causing numerous instances of flooding and drought damages. Thus, sophisticated analyses of rainfall-runoff phenomena are needed to reduce the damage caused by these weather disasters. Furthermore, analyzing the impact of extreme rainfall events occurring in a short period of time is essential for flood management. In this study, the Nakdong River, located in Yangsan, Gyeongsangnam-do, which is prone to localized heavy rainfall and flash floods, was selected as the target basin to conduct flood-runoff simulation. We used distributed runoff models such as spatial runoff assessment tool (S-RAT) and Vflo™ for this simulation, and compared and analyzed their results. Furthermore, using the same events, the validity and applicability of the S-RAT model has been verified through calibration. The errors of both models were calculated using statistical analysis to examine the domestic basin applicability of the S-RAT model. 전 세계적으로 기후변화로 인하여 지구의 평균기온이 상승하고 엘리뇨, 라니냐와 같은 이상기후가 빈번하게 발생하며 이로인한 홍수나 가뭄 등의 피해 또한 잦아지고 있다. 이러한 기상재해에 따른 피해를 줄이기 위해 강우-유출 현상에 관한 정교한해석이 필요하며, 단기간에 발생되는 호우사상에 대한 유출해석은 홍수관리 측면에서 중요한 역할을 한다. 본 논문에서는국지성 집중호우 및 돌발홍수가 잦은 낙동강수계인 경상남도 양산에 위치한 양산천을 대상유역으로 선정하여 홍수유출모의를실시하였다. 홍수유출모의에는 분포형모형인 S-RAT모형과 Vflo™모형을 사용하였다. 또한 S-RAT모형의 검증을 위해 동일한사상을 이용하여 보정 및 검증을 하였으며, 통계학적 분석을 통하여 두 모형의 오차를 계산하여 S-RAT모형의 적용성을 검토하였다.
Implant에 사용되는 CAD/CAM 전용 zirconia abutment의 표면적과 디자인에 따른 유지력 차이
남택모,김한곤,김병식,임시덕,Nam, Taeg-Mo,Kim, Han-Gon,Kim, Byung-Sik,Lim, Si-Duk 대한치과기공학회 2010 대한치과기공학회지 Vol.32 No.4
Purpose: The aim of this study is to make some basic materials to find retention force difference based on the total height of CAD/CAM zirconia abutment used for implant, retention force difference based on how to regulate the height of the abutment, retention force difference based on the size and retention force difference based on the design group. Methods: The retention force was measured by being pulled at the speed of 1mm/min after being combined with zirconia block and abutment using Temp-BOND of Kerr. The experiment was done at the research lab of OSTEM in Busan by useing UNIVERSAL TESTING MACHINE on March 3rd, 2010. Results: After analysing the total height and the retention force, p-value had minor difference by 0.01 statistically. Namely, 3mm, 4mm, 5mm had the retention force difference and we could see retention force difference on 3mm and 5mm at the post test. After analyzing how to regulate the height and retention force, p-value had minor difference by 0.000 statistically. Namely, 1mm and 2mm had the retention difference and we could see that 1mm and 2mm with the total height had retention difference. After analyzing the retention force based on the size, p-value had minor retention force difference by 0.000 statistically. Namely, 7 different size had retention force difference and we could see the size 21.9mm, 32.9mm, 32.9mm, 38.4mm, 48.9mm and 54.9mm had retention force difference. Conclusion: Namely 9 different design group had retention difference and we could see that 9 design group with 5.6.7.8 design group and 9 design group with 1.2.3.4. design group had retention force.