-Preemptive-Priority M/G/1 Queues with Finite and Infinite Buffers

Table 1

Random variables representing a certain time period.

Symbol	Definition
	The service time of a class- customer,
	The gross service time of a class-2 customer
	The completion time of a class-2 customer
	The occupation time of a class-2 customer
	The idle period
	The standard busy period starting with a single customer in the M/G/1/ queue
	The busy period starting with customers and terminating as soon as the queue size reaches in the M/G/1/ queue,