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Risk Assessment and Early-Warning of Venture Capital Project
Gao Weiyi 인하대학교 정석물류통상연구원 2009 인하대학교 정석물류통상연구원 학술대회 Vol.2009 No.10
This paper, taking use of AHP model and mathematical evaluation model, set up a multiple functions of risk assessment control method with sub-target evaluation and comprehensive evaluation, which is more appropriate for the current and subsequent information collection and treatment. This method overcomes the restrictions that modern risks control theory and methods need the historical adequate data and effective prior information. The role of early warning systems is to eliminate latent crisis in the bud in the risk investment process. The framework of early warning system for the risk investment agency consists of the four major sections; early warning organizations, early warning tool, the implementation of the process of early warning and preventive measures of early warning.
Strain rate effect of steel-concrete composite panel indented by a hemispherical rigid body
Weiyi Zhao,Lin Wang,Guotao Yang,Ziguo Wang,Zepeng Gao,Quanquan Guo 국제구조공학회 2020 Steel and Composite Structures, An International J Vol.36 No.6
This paper presents numerical and theoretical investigations on the strain rate in steel-concrete composite (SC) panels under low-velocity impact of a hemispherical rigid body. Finite element analyses were performed on five specimens with different loading rates. The impact energy was kept constant to eliminate its influence by simultaneously altering the velocity and mass of the projectile. Results show that the strain rate in most parts of the specimens was low and its influence on bearing capacity and energy dissipation was limited in an average sense of space and time. Therefore, the strain rate effect can be ignored for the analyses of global deformation. However, the strain rate effect should be considered in local contact problems. Equations of the local strain and strain rate were theoretically derived.
Flow and heat transfer characteristics in a channel having furrowed wall based on sinusoidal wave
Jiansheng Wang,Xiaoming Gao,Weiyi Li 한국화학공학회 2015 Korean Journal of Chemical Engineering Vol.32 No.11
The effect of wall geometry on the flow and heat transfer in a channel with one lower furrowed and an upper flat wall kept at a uniform temperature is investigated by large eddy simulation. Three channels, one with sinusoidal wavy surface having the ratio (amplitude to wavelength) α/λ=0.05 and the other two with furrowed surface derived from the sinusoidal curve, are considered. The numerical results show that the streamwise vortices center is located near the lower wall and vary along the streamwise on various furrow surfaces. The furrow geometry increases the pressure drag and decreases the friction drag of the furrowed surface compared with that of the smooth surface; consequently, the total drag is increased for the augment of pressure drag. As expected, the heat transfer performance has been improved. Finally, a thermal performance factor is defined to evaluate the performance of the furrowed wall.