Open Queueing Networks
􀂉 Queueing Network: model in which jobs departing from one
queue arrive at another queue (or possibly the same queue)
􀂉 Open queueing network: external arrivals and departures
􀂾 Number of jobs in the system varies with time.
􀂾 Throughput = arrival rate
􀂾 Goal: To characterize
the distribution of
number of jobs
in the system.

PN Junction

When a p-type semiconductor is suitably joined to n-type semiconductor, the contact surface is called pn junction.