Dynamics in Logistics Case Study

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Queues v System Dynamics

In a system there are different entities that are flowing into and accumulate in stocks then they flow out sometimes into another stock. This is just the same as items in a queue or waiting line. However there are some aspects which are different from queue when compare to systems dynamics. Queues are different from the items that are flowing in and out of stocks as characterized by system dynamics.

System dynamics construct normally allows for modeling of continuous events and bringing in system feedback. System dynamics is thus a methodology that is used in the understanding of how systems work over time. There are two types of systems the open and feedback systems. An open system is one that takes inputs and produces an output from them which does not have any impact on future inputs. On the other hand a feedback system is one that uses the outputs of one cycle in order to influence the inputs for decision making in future cycles.

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There are several examples of items that flow using a system dynamic model. One example is savings and interest accumulated on the savings. Savings is a level whereas interest is a decision function which is represented by the valve in system dynamics. The valve is what controls the rate of flow into the savings from the interest. The interest is normally dependent on the current levels of savings and interest rates. The interest normally causes the rate to change when it comes to amount of savings. A second example is a manufacturing company whereby the rate of production is dependent the supply of raw materials. If there are no raw materials then the production can not go on (Aitelli, & Deckro, 2004).

Queuing theory is the study of contention when it comes to using shared but limited resources. It is made up of….....

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