Hossein Karimi

11 Questions 26 Answers 0 Followers

Questions related from Hossein Karimi

How can I demonstrate a polyhedron in MATLAB using just its vertices?

I have some points that they are the vertices of a polyhedron. How can I show this polyhedron in MATLAB? See the attached file for the coordinations.

18 March 2020 1,323 6 View

What are the criteria to evaluate the performance of a valid inequality in a bi-objective mathematical model?

I have a bi-objective MIP model. I proposed some valid inequalities to tighten the model. I know in a single objective problem, I can check the linear relaxation solution to evaluate the...

29 December 2016 5,321 6 View

What is the advantages of MIP model? Why the MIP model are proposed for the problems?

Dear researchers, In recent years, many of the researchers have introduced MIP models for engineering problems. It can be seen that many of them proposed metaheuristics to solve the models. As I...

16 September 2016 2,658 7 View

What is your idea about this claim in the location routing problem?

Some researchers declare that the location is a strategic, while routing is a tactical problem in the location-routing problem. Also, they express that the routes can be re-calculated more and...

21 December 2013 7,346 5 View

What does the fixed cost mean in the location-routing problem?

The location-routing problem is an integrated model, which combines the location as a strategic problem and the routing as an operational problem. However, what is the fixed cost of this model? In...

21 December 2013 3,339 8 View

Is it possible the master and subproblem in the benders decomposition be MIP?

I encounter with a big MIP model. I have two ideas to decomposing it. The first one is to decompose it to IP and LP problems. The second one is to decompose the mode to two MIPs. The first...

19 October 2013 5,651 8 View

What is your idea about integrating location and routing problem?

Nowadays, Location-Routing Problem (LRP) has been developed significantly. However, a question which annoys me for sometime is how can the location as a strategic problem and routing as an...

21 September 2013 1,637 6 View

Knapsack Problem

What is the best method to achieve a tight upper bound for knapsack problem?

20 June 2013 5,474 4 View

How can I define fixed cost for the real location problem in urban transportation area?

I want to calculate the fixed cost in the urban transportation problem. I think based on the flow and distance, I can define a fixed cost near real-world one. Any one can help me with this problem?

23 April 2013 2,939 2 View

Why is the linear relaxation of the shortest path problem solution the same as the integer model?

What is the specific feature of the shortest path problem formulation the causes the integer solution?

14 April 2013 6,014 5 View

What is the difference between CPLEX solver in GAMS and IBM ILOG CPLEX?

I usually face with MIP problems. I want to know what software is better in what aspect (such as solution time, used node etc.) in MIP, CPLEX solver in GAMS or IBM ILOG CPLEX?

11 February 2013 4,130 11 View