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장원석(W. S. Jang),서창희(C. H. Suh),오상균(S. K. Oh),김동배(D. B. Kim),성지현(J. H. Sung),정윤철(Y-C. Jung),김영석(Y. S. Kim) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.4
In order to apply boron steel sheet to chassis part of automobile, outstanding material property of low cycle fatigue life is required, as well as formability during hot stamping. Therefore, low cycle fatigue life of quenched boron steel by hot stamping was investigated in this study. Outstanding fatigue life was obtained at low strain amplitude compared with as-received boron steel sheet. However, at high strain amplitude, fatigue life was declined, because of low ductility and fracture toughness of martensite which was generated by hot stamping.
효과적인 하천 오염부하량 산정 위한 NI 방법 및 ESTIMATOR, LOADEST 모형 적용 및 평가
장원석 ( W. S. Jang ),류지철 ( J. C. Ryu ),강현우 ( H. W. Kang ),이지원 ( J. Y. Lee ),김기성 ( K. S. Kim ),임경재 ( K. J. Lim ) 강원대학교 농업생명과학연구원(구 농업과학연구소) 2011 강원 농업생명환경연구 Vol.23 No.1
It is required to estimate Nonpoint Source (NPS) pollutant loadings and to evaluate emission characteristics of NPS in order to protect and manage eutrophication in a stream. Thus, the purpose of this study is to 1) calculate total pollutant loadings and pollutant loadings by baseflow from the stream using Numeric Intergration (NI), ESTIMATOR, and LOADEST, and to 2) give a guideline regarding the most appropriate model for estimating pollutant loadings through the comparison of NI, ESTIMATOR, and LOADEST. As a result of this study, of total pollutant loadings from the stream, pollutant loadings by baseflow ranges from 54 to 85 %. Therefore, because the result of this study shows that pollutant loadings by baseflow are bigger than that by streamflow, it is very necessary for the efficient management of pollutant loadings by baseflow.