证明了递减反向失效率(DRHR)性质关于卷积运算封闭，同时证明了该性质在累积发生率是凹的非齐次泊松冲击模型中也封闭。
It is also shown that the DRHR property can be preserved under non-homogeneous Poisson shock model with increasing concave cumulative rate of occurrence.
证明了递减反向失效率(DRHR)性质关于卷积运算封闭，同时证明了该性质在累积发生率是凹的非齐次泊松冲击模型中也封闭。
It is also shown that the DRHR property can be preserved under non-homogeneous Poisson shock model with increasing concave cumulative rate of occurrence.
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