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THworse= 1/To Little’s Law predicts the stability of the system by comparing the actual values of TH, WIP and CT of the system with the obtained values from the scenario that it is been compared (best, practical worst, and worst case). Little’s law would allow the comparison of TH, WIP and CT, measures of the system in study, and calculate the Critical WIP to determine if the system in study is working efficiently or not. 2.11 MODELING AND SIMULATION A model is a close approximation of a real system and incorporates most of its outstanding features; and modeling is the process to produce it. The purpose of a model is to allow the specialist to predict the effect of changes into the system. A mathematical model is used when a simulation study is needed to be performed. This type of model can be classified in the following (Anu 1997): 1. Deterministic: input and output variables 2. Stochastic: at least one of the input or output variables is probabilistic. 3. Static: time is not taken into account. 4. Dynamic: time varying interactions among variables are taken into account. Simulation is the operation of a model of a system. According to Selvaraju (2009): “Simulation is a tool used in manufacturing to improve processes by observing and predicting the performance of the process desired.” Also, simulation can be used to validate a model before the existing system is modified or a new one is built; so, the chances of failure can be reduced and performance can be optimized (Anu 1997). Selvaraju (2009) states the following: “Simulation is generally used as an analysis and decision- making tool in three classes of problems: 1) design problems, 2) planning problems, and 3) 27PDF Image | Impact of Vacuum-Drying on Efficiency of Hardwood Products
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