System Modeling and Simulation

A company used 6 trucks to haul manganese from Kolar to industry. There are two loaders,to load each truck. After loading, a truck moves to the weighing scale to be weighed. The queue discipline is FIFO. When it is weighed, a truck travels to the industry and returns to the loader queue. The distribution of loading time, weighing time and travel time are as follows:

End of simulation is completion of four weighing from the scale. Calculate the total busy time of both loaders, scale, average loader and scale utilization. Assume that four trucks are at the loaders and Two are at the scale, at time "O". The shopping of simulation is after 10 iterations.

Use linear congruential method to generate a sequence of 5 random numbers, with given seed 27, increment 43, and constant multiplier 17, modulus 100. 

With neat diagram, explain the iterative process of calibrating a model.

Explain components of verification and validation process. Explain with neat diagram,model building, verification and validation process 

Differentiate between terminating and steady state simulations by giving one example each.

Differentiate between point estimation and interval estimation.

Explain the replication method for steady-state simulations.

Test whether the following data follows Poisson distribution using the chi-square test of goodness of fit. With mean  = 0.05. Take  = 11.1 

Explain acceptance - rejection technique for Poisson distribution. Generate 5 Poisson variates with mean  = 0.25. Random numbers are: 0.073, 0,693, 0.945, 0.739, 0.014, 0.342. 

Test whether the 2^nd, 9^th, 16^th........ Numbers in the following sequence are auto correlated by taking  = 0.05. Take  = 1.96.

0.38, 0.48, 0.36, 0.01, 0.54, 0.34, 0.96, 0.06, 0.61, 0.85, 0.48, 0.86, 0.14, 0.86, 0.89, 0.37, 0.49, 0.60, 0.04, 0.83, 0.42, 0.83, 0.37, 0.21, 0.90, 0.89, 0.91, 0.79, 0.77, 0.99, 0.95, 0.27, 0.41, 0.81, 0.96, 0.31, 0.09, 0.06, 0.23, 0.77, 0.73, 0.47, 0.13, 0.55, 0.11, 0.75, 0.36, 0.25, 0.23, 0.72, 0.60, 0.84, 0.70, 0.30, 0.26, 0.38,0.05,0.19, 0.73, 0.44.

The sequence of random numbers 0.54, 0.73, 0.98, 0.11 and 0.68 has been generated. Use K-S test with  = 0.05 to determine if the hypothesis that the numbers are uniformly distributed on the interval [0, 1] can be rejected. Take D=0.565.

With a neat flow chart, explain various steps in a simulation study.

Explain the various steady state parameters of M/G/1 Queue.

Explain the characteristics of a queuing system.

What is Poisson process? With example explain the properties of Poisson process.

Explain simulation in Java.

Explain the various concepts used in discrete-event simulation with an example.

A computer technical support center is staffed by two people, Able and Baker, who take calls and try to answer questions and solve computer problems. The time between calls ranges from 1 to 4 minutes with the distribution as shown in Table 1.1. Able is more experienced and can provide service faster than Baker, which means that, when both are idle, Able takes the call. The distribution of their service times are shown in Table 1.2 and Table 1.3 respectively. 

Random digits for inter-arrival times are: 26, 98, 90, 26, 42, 74, 80, 68, 22, 48, 34, 45, 24, 34.

Random digits for service time are: 95, 21, 51, 92, 89, 38, 13, 61, 50, 49, 39, 53, 88, 01, 81. Simulate this system for 10 customers, by finding

i) Average waiting time for a customer

ii) Average Inter Arrival time

iii) Average service time of Able

iv) Average service time of Baker

v) Average waiting time of those who wait.

 Briefly explain the advantages and disadvantages of simulation.