BU275 Lecture Notes - Lecture 15: Sensitivity Analysis, Standard Deviation, Profit Margin
Document Summary
Bu275 lecture #15: queueing models (continued) & computer. Multiple server queues m/m/c: c = number of servers, (cid:541) = service rate per server, among m/m/c systems, the simplest to analyze is m/m/c system with infinite calling. = <1 for a stable queue population and waiting space, and fcfs serving policy: even so, its formulas for the operating characteristics are complex (see an example below) so applying them is not required for this course. Analyzing design-cost tradeoffs: wc = waiting cost per time unit, sc = service cost (capacity cost) per time unit, tc = cost per time unit the objective is to minimize the total cost of the service system. Call center example: the help desk of a small company has a single employee to answer calls. Customer calls can be adequately modeled by a poisson process with an average of 1 call every 3 minutes.
