COURSE INDUSTRIAL ENGINEERING LESSON: QUEUING
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QUEUING The goal of a queuing theory is the achievement of an economic balance between the cost of providing service and the cost associated with the wait required for that service. This theory is used in service oriented organisation, machine repair shops, in case of semi finished products waiting for finishing operations, etc Provida Sesvic COST Cost of level of Se vice- Optmun Sesvice Level
CHARACTERISTICS OF QUEU NG MODEL . Arrival pattern of Customers: Although the arrival might follow any pattern assumption which supports many real world situation is that the arrivals are Poisson's Distribution. Arrival is random and random arrival is best described by Poisson's Distribution Service Pattern or Service Rate: The service rate describes the number of customers serviced during a particular time period. The queuing models are based on assumptions that service times are exponentially distributed 2. 3. Service Rule or Service Order: It gives the information about queue discipline which means the order by which customers are picked from the waiting line and being served. A) FIFO or FCFS- First in First Out, First come first serve B) LIFO-Last in First Out C) SIRO - Service in Random Order D) Priority Service-VIPs
SERVICE CHANNEL AND SERVER Single Server, Single Channel Multiple Channel, Single Server Single Channel, Multiple Server Multiple Channel, Multiple Server Si
CUSTOMER IN SYSTEM In most of the cases the capacity of system is limited but it may be infinite also. The entire samples of the customers from which only a few visit the service facility is known as the calling population or in good service. The size of calling population can be infinite or finite. Calling population is infinite when the arrival of customers does not have any effect on the arrival rate of future customers.
CUSTOMER ATTITUDE Customer Attitude Impatient Patient Jockeying BalkingReneging Cheater
CUSTOMER ATTITUDE Patient: Customer's joins the queue and wait till he enters the service station to get the serice Impatient: Customer's who are trying to get the service faster A. Jockeying: Customers keep on changing queue with the hope to get the service at a faster rate. B. Balking: Customer decide not to join the queue and leave the system as queue is very long C. Reneging : Customer joins the queue for sometime then leaves the system as queue is moving very slowly. D. Cheater: Customer takes illegal means like bribing, fighting, etc to get service at a faster rate.
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