Assignment 1
Due: 9/24/2018: 2024 – Write My Essay For Me | Essay Writing Service For Your Papers Online 5:0 pm
1. Use “Assignment_1_Formulation” file to answer the following questions:
a. Code and solve formulation [HUB-R] with the following size of the data: |I| = 30, |J| = 20, |K| = 20, and |L| = 3 with random parameters introduced in Table 1 from the file.
b. Read the input parameters from a file.
c. Set a time limit of 30 minutes to solve the optimization model.
d. Set an optimality gap of 0.5% to solve the optimization model.
e. Print the results of Y variables in an output file.
f. Create an LP file for the optimization model.
g. Compare the running time of the model with and without enabling the “preprocessing” option.
h. How to check that the model is feasible? Write a code for feasibility check.
i. Assume that the model will be initialized with an assumption that the top 5 intermodel hubs with high failure probability qj will not be selected in the initial iterations. However, these intermodal hubs can be selected later in the final results. Write a code to handle this initialization and compare the optimal solution and running time of this approach with 1(a).
j. Consider the same case as discussed in 1(i) but assume that the top 3 intermodel hubs with high failure probability qj will not be selected in the final results. Therefore, set those Ylj variable values to zero.
