![]() We shall first deal with the theoretical developments. The queuing theory is concerned with the effect that each of the three aspects has on various quantities of interest such as the length of the queue, the service time distributions, and the average waiting time. One of the possible ways is "first come, first served." ![]() The Queue discipline is the manner in which a customer is selected for service out of all those awaiting service. The service mechanism describes when service is available, how many customers can be served at a time, and how long service takes for examples, the exponential service time distribution, the constant service time distribution, etc.ģ. One of the common arrival patterns is that of Poisson input.Ģ. Input process or the arrival pattern is the probability law with both the average rate or customers and the statistical pattern of the arrivals. In order to study the nature of the waiting-line problem, the following three aspects should be specified.ġ. The group waiting to receive service is called a queue for example: Patients arriving at a clinic to see a doctor students waiting at a window for registration packages persons waiting in a Greyhound bus station to buy tickets numerous problems connected with telephone exchanges machines which stop from time to time and require attention by an operator before restarting, the operator being able to attend to only one machine at a time, etc. The waiting-line problem is described by a flow of customers requiring service when there is some restriction on the service that can be provided. The waiting-line analysis or queueing problem of operations research is the most important part in which the theory of stochastic processes applies most often. Since stochastic processes provides a method of quantitative study through the mathematical model, it plays an important role in the modern discipline or operations research. No attempt has been made to investigate all applications in this report, as we are especially interested in the study of the theory of stochastic processes in application to operations research. ![]() The theory of stochastic processes has developed very rapidly and has found application in a large number of fields for example, the study of fluctuations and noise in the physical system, in the information theory of communication and control, in operations research, in biology, in astronomy, and so on. Let T be a set which is called the index set (thought of as time), then, a collection or family of random variables is the observation at time t. 1.2 Stochastic Processes Independent increaments Consider a stochastic process : with continuous time space T. We will now give a formal definition of a stochastic process. All the above examples are taken from real life situation and the classification of stochastic process is vivid from these examples.Next we see some of the processes with special properties. Thus, stochastic processes can be referred to as the dynamic part of the probability theory. A random phenomenon that arises through a process which is developing in time and controlled by some probability law is called a stochastic process. We conclude with a brief introduction into metastability, the phenomenon that stochastic processes may have very different behaviour at different time scales.Just as the probability theory is regarded as the study of mathematical models of random phenomena, the theory of stochastic processes plays an important role in the investigation of random phenomena depending on time. The best-known examples are random walks and stochastic differential equations, and we discuss examples of these and some of their properties, as well as methods for numerical simulation. We conclude with a brief introduction into metastability, the phenomenon that stochastic processes may have very different behaviour at different time scales.ĪB - In this chapter we give a short introduction to the concept of stochastic processes, evolution equations with random solutions. N2 - In this chapter we give a short introduction to the concept of stochastic processes, evolution equations with random solutions.
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