The result shows that the best decision mle depends on the distribution of readers' arrival and the relationship between the best renewing time and hazard function is deduced. 結果發(fā)現最優(yōu)規則有賴(lài)于讀者到達的分布,導出了最優(yōu)續借時(shí)刻由風(fēng)險率函數決定的關(guān)系。