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\left(c_{h}+\alpha c_{1}\right)\left[\frac{p}{\alpha^{2}} \log \left\{1+\frac{\alpha}{p} e^{-\alpha t_{i-1}} \int_{t_{i-1}}^{t_{i}} e^{\alpha u} D(u) d u\right\}-\frac{1}{\alpha} \int_{t_{i-1}}^{t_{i}} D(u) d u\right]