Yuanyuan Zhang

Analysis of a Repairable k-out-of-n:G System with Expert Repairman's Multiple Vacations and Shut off Rule

Yuanyuan Zhang, Wenqing Wu & Yinghui Tang · Journal of Advances in Mathematics and Computer Science · 2017

This paper investigates an k-out-of-n:G repairable system with expert repairman’s multiple vacations and continuous operation rule where the operating times and the repair times of components follow exponential distributions. When there is no failed component in the system, the e...

Open access Research Article 10.9734/BJMCS/2017/30869

Analysis of a Modified Gompertz Model Based on Nonlinear Least Squares Method

Lizhi Yang, Xiwang Xiang, Jiahao Cao & Yuanyuan Zhang · Journal of Advances in Mathematics and Computer Science · 2019

This paper proposes a modified Gompertz model with a constant free term based on the classical Gompertz model. Different from the three-sum method for determining the parameters of classical Gompertz model, this paper construct an optimization problem with the help of nonlinear l...

Open access Research Article 10.9734/jamcs/2019/v30i530089