在這篇論文中，我們考慮了帶有不耐煩顧客以及在假期狀態中工作的排隊系統。 顧客不只會在工作假期時離開也會在一般的服務時期離開。當服務器發現系統是空的時候，會進入工作假期模式。而在工作假期時，服務器不會停止運作而是用比起一般時期而言相對低的服務速率來繼續運作。我們的論文是分析關於這個排隊模型下的一些指標，例如，系統平均的大小，系統為空的機率，以及系統的壅塞率等。在最後，我們給出了一些數值結果來研究在不同的參數底下，這些模型表現的差異。

In this paper, we consider the queueing system with impatient customers and working vacation. Customers will leave not only in the working vacation period but also in the busy period. When the server finds out that the queue is empty, it will turn into working vacation period which has a slower service rate than that in the busy period. This thesis is to study the performance measures, such as probability of the system being empty, mean queue size, system congestion rate and so on. At last, we give some numerical results to show the measures are affected by different parameters.

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