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Research on the Efficiency of Cloud Resource Allocation and Operation Based on DEA Method
Li Wenjuan,Wu Jiyi,Zhang Qifei,Zhao Haili 보안공학연구지원센터 2015 International Journal of Grid and Distributed Comp Vol.8 No.5
In order to compensate for the current lack of assessing cloud resource allocation and business operation from the economical perspective, this paper introduced the Data Envelopment Analysis (DEA) method which is one of the most famous methods in economics into this field. Based on it, it proposed several new methods to evaluate the efficiency of cloud resource allocation and cloud providers’ business operation status through the way of case study.
Jiangang Liu,Zhipeng Tong,Gao-Hong Yu,Xiong Zhao,Haili Zhou 대한기계학회 2022 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.36 No.5
Non-circular gears with small curvature radius pitch curve are often used in the mechanical transmission of special motion path, but this kind of non-circular gear produces serious undercutting. Therefore, this research presented a kind of variable-involute and variable-cycloid composite tooth profile (VIVC-CTF). A transmission ratio curve of non-circular gear was designed by using Fourier function. The tooth profile equation of VIVC-CTF and its conjugate tooth profile equation were constructed on the basis of the normal and envelope methods. The influence of slip coefficient and ellipse eccentricity on the VIVC-CTF was investigated, and the variation of slip coefficient and eccentricity on the meshing line length, theoretical contact ratio, and pressure angle at pitch curve was analyzed. The meshing experiment of the VIVCCTF non-circular gear transmission mechanism was carried out on the basis of high-speed camera technology. The theoretical results of the transmission ratio were consistent with the experimental results.