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Question 38838

posted 1 years ago

How to evaluate the quality of an OR model?

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Question 38835

posted 1 years ago

. In solving real world problems, when it is more appropriate to use mathematical modeling instead of qualitative methods? And why the Operations Research modeling approach could be more effective?

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Question 38836

posted 1 years ago

3. What are some possible sources of data needed to derive parameters of OR models?

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Question 38837

posted 1 years ago

4. Give an example on possible application of OR modeling approaches in two of the following areas:
d. Construction industry
b. Machining process
C. Oil industry
a. Healthcare
e. Agriculture planning

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Question 38834

posted 1 years ago

What do we mean by an Operations Research (OR) model? And what are the various elements of such model?

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Question 40774

posted 1 years ago

Consider the following network:
Formulate an integer program to find the shortest path from node 1 to 5.

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Question 40772

posted 1 years ago

Question 1) Tom Cruise, Freddy Prinze Jr., Harrison Ford, and Matt Le Blanc are marooned on a desert island with Jennifer Aniston, Courtney Cox, Gwyneth Paltrow, and Julia Roberts. The"compatibility measures" in Table 2 indicate how much happiness each couple would experience if they spent all their time together. The happiness earned of time they spend together.a couple is proportional to the fraction
A)Formulate an LP whose solution will maximize the total happiness, considering x_ij as the fraction of time ih man spends with j™ woman.
b) Solve it with Lingo, did you find an integer solution? What do you think it means?

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Question 40775

posted 1 years ago

9.5-3. The next diagram depicts a system of aqueducts that originate at three rivers (nodes RI, R2, and R3) and terminate at a major city (node T), where the other nodes are junction points in the system.
Using units of thousands of acre feet, the tables below the diagram show the maximum amount of water that can be pumped through each aqueduct per day.
The city water manager wants to determine a flow plan that will maximize the flow of water to the city.

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Question 40776

posted 1 years ago

Consider the following list of activities and predecessors.
a)Draw the network diagram. Write down the LP to determine the completion time. Write down the activities on the critical path.
b)Suppose that by hiring additional workers, the duration of each activity can be reduced. The costs per day of reducing the duration of the activities are given in the following table. Write down the LP to complete the project within 20 days with minimum cost.

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Question 40773

posted 1 years ago

The Childfair Company has three plants producing child push chairs that are to be shipped to four distribution centers. Plants1, 2, and 3 produce 12, 17, and 11 shipments per month, respectively.Each distribution center needs to receive 10 shipments per month. The distance from each plant to the respective distributing centers is given in the table below. The freight cost for each shipment is $100 plus 50 cents per mile. How much should be shipped from each plant to each of the distribution centers to minimize the total shipping cost?
a) Construct the transportation tableau
b) Is this a balanced transportation model? If not, convert it into a balanced model
c) Write the LP formulation for this problem.
d) Solve it with Excel or Lingo, write down the optimal solution on your answer sheet(values of the decision variables and the objective function ). Include your software model and output files

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