# American Institute of Mathematical Sciences

January  2021, 17(1): 117-131. doi: 10.3934/jimo.2019102

## Biobjective optimization over the efficient set of multiobjective integer programming problem

 1 USTHB, Department of Operational Research, Bp 32 El Alia, 16111 Algiers, Algeria 2 USTHB, LaROMaD Laboratory, Bp 32 El Alia, 16111 Algiers, Algeria

Received  May 2018 Revised  April 2019 Published  September 2019

In this article, an exact method is proposed to optimize two preference functions over the efficient set of a multiobjective integer linear program (MOILP). This kind of problems arises whenever two associated decision-makers have to optimize their respective preference functions over many efficient solutions. For this purpose, we develop a branch-and-cut algorithm based on linear programming, for finding efficient solutions in terms of both preference functions and MOILP problem, without explicitly enumerating all efficient solutions of MOILP problem. The branch and bound process, strengthened by efficient cuts and tests, allows us to prune a large number of nodes in the tree to avoid many solutions. An illustrative example and an experimental study are reported.

Citation: Yasmine Cherfaoui, Mustapha Moulaï. Biobjective optimization over the efficient set of multiobjective integer programming problem. Journal of Industrial & Management Optimization, 2021, 17 (1) : 117-131. doi: 10.3934/jimo.2019102
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##### References:
Search tree of the example
Optimal simplex table for node 0
 $\mathcal{B}_1$ $x_1$ $x_3$ $x_5$ $RHS$ $x_4$ $5/6$ -$1$ $2/3$ $53/6$ $x_2$ $1/3$ $0$ $2/3$ $16/3$ $x_6$ $1/3$ $5/2$ -$2/3$ 2/3 $\bar{d}^1$ -$7/6$ -$1/2$ -$10/3$ $80/3$
 $\mathcal{B}_1$ $x_1$ $x_3$ $x_5$ $RHS$ $x_4$ $5/6$ -$1$ $2/3$ $53/6$ $x_2$ $1/3$ $0$ $2/3$ $16/3$ $x_6$ $1/3$ $5/2$ -$2/3$ 2/3 $\bar{d}^1$ -$7/6$ -$1/2$ -$10/3$ $80/3$
Optimal simplex table for node 1
 $\mathcal{B}_2$ $x_3$ $x_5$ $x_7$ $RHS$ $x_4$ -$1$ $-1$ $\frac{5}{2}$ $8$ $x_1$ $0$ $2$ -$3$ $1$ $x_6$ $\frac{5}{2}$ $0$ -$1$ $1$ $x_2$ $0$ $0$ $1$ $5$ $\bar{d}^1$ -$\frac{1}{2}$ -$1$ -$\frac{7}{2}$ $\frac{51}{2}$ $\bar{d}^2$ $1$ $0$ $0$ $0$ $\bar{c}^1$ $-1$ $-2$ $5$ $-9$ $\bar{c}^2$ -$\frac{1}{2}$ $0$ -$2$ $10$ $\bar{c}^3$ -$1$ -$2$ $3$ $1$
 $\mathcal{B}_2$ $x_3$ $x_5$ $x_7$ $RHS$ $x_4$ -$1$ $-1$ $\frac{5}{2}$ $8$ $x_1$ $0$ $2$ -$3$ $1$ $x_6$ $\frac{5}{2}$ $0$ -$1$ $1$ $x_2$ $0$ $0$ $1$ $5$ $\bar{d}^1$ -$\frac{1}{2}$ -$1$ -$\frac{7}{2}$ $\frac{51}{2}$ $\bar{d}^2$ $1$ $0$ $0$ $0$ $\bar{c}^1$ $-1$ $-2$ $5$ $-9$ $\bar{c}^2$ -$\frac{1}{2}$ $0$ -$2$ $10$ $\bar{c}^3$ -$1$ -$2$ $3$ $1$
Optimal simplex table for node 3
 $\mathcal{B}_3$ $x_5$ $x_6$ $x_9$ $RHS$ $x_4$ 1 $\frac{5}{2}$ $\frac{21}{4}$ $\frac{21}{5}$ $x_1$ 2 -3 $\frac{15}{2}$ $\frac{11}{2}$ $x_3$ 0 0 -1 1 $x_2$ 0 1 $\frac{5}{2}$ $\frac{7}{2}$ $x_7$ 0 -1 -$\frac{5}{2}$ $\frac{3}{2}$ $x_8$ 0 -1 -$\frac{5}{2}$ $\frac{1}{2}$ $\bar{d}^1$ -1 -$\frac{7}{2}$ -$\frac{37}{4}$ $\frac{79}{4}$
 $\mathcal{B}_3$ $x_5$ $x_6$ $x_9$ $RHS$ $x_4$ 1 $\frac{5}{2}$ $\frac{21}{4}$ $\frac{21}{5}$ $x_1$ 2 -3 $\frac{15}{2}$ $\frac{11}{2}$ $x_3$ 0 0 -1 1 $x_2$ 0 1 $\frac{5}{2}$ $\frac{7}{2}$ $x_7$ 0 -1 -$\frac{5}{2}$ $\frac{3}{2}$ $x_8$ 0 -1 -$\frac{5}{2}$ $\frac{1}{2}$ $\bar{d}^1$ -1 -$\frac{7}{2}$ -$\frac{37}{4}$ $\frac{79}{4}$
Optimal simplex table for node 4
 $\mathcal{B}_4$ $x_6$ $x_9$ $x_{10}$ $RHS$ $x_4$ $1$ $\frac{3}{2}$ -$\frac{1}{2}$ $\frac{11}{2}$ $x_2$ $1$ $\frac{5}{2}$ 0 $\frac{7}{2}$ $x_3$ $0$ -$1$ $0$ $1$ $x_1$ $0$ $0$ $1$ $5$ $x_5$ -$\frac{3}{2}$ -$\frac{15}{4}$ -$\frac{1}{2}$ $\frac{1}{4}$ $x_7$ -$1$ -$\frac{5}{2}$ $0$ $\frac{3}{2}$ $x_8$ -$1$ -$\frac{5}{2}$ 0 $\frac{1}{2}$ $\bar{d}^1$ -$5$ -$13$ -$\frac{1}{2}$ $\frac{39}{2}$
 $\mathcal{B}_4$ $x_6$ $x_9$ $x_{10}$ $RHS$ $x_4$ $1$ $\frac{3}{2}$ -$\frac{1}{2}$ $\frac{11}{2}$ $x_2$ $1$ $\frac{5}{2}$ 0 $\frac{7}{2}$ $x_3$ $0$ -$1$ $0$ $1$ $x_1$ $0$ $0$ $1$ $5$ $x_5$ -$\frac{3}{2}$ -$\frac{15}{4}$ -$\frac{1}{2}$ $\frac{1}{4}$ $x_7$ -$1$ -$\frac{5}{2}$ $0$ $\frac{3}{2}$ $x_8$ -$1$ -$\frac{5}{2}$ 0 $\frac{1}{2}$ $\bar{d}^1$ -$5$ -$13$ -$\frac{1}{2}$ $\frac{39}{2}$
Optimal simplex table for node 5
 $\mathcal{B}_5$ $x_5$ $x_9$ $x_{10}$ $RHS$ $x_4$ $\frac{2}{3}$ -1 $\frac{5}{6}$ $\frac{29}{6}$ $x_1$ 0 0 -1 6 $x_3$ 0 -1 0 1 $x_2$ $\frac{2}{3}$ 0 $\frac{1}{3}$ $\frac{10}{3}$ $x_7$ $-\frac{2}{3}$ 0 $-\frac{1}{3}$ $\frac{5}{3}$ $x_8$ $-\frac{2}{3}$ 0 $-\frac{1}{3}$ $\frac{2}{3}$ $x_6$ $-\frac{2}{3}$ $\frac{5}{2}$ $-\frac{1}{3}$ $\frac{1}{6}$ $\bar{d}^1$ $-\frac{10}{3}$ $-\frac{1}{2}$ $\frac{7}{6}$ $\frac{115}{6}$
 $\mathcal{B}_5$ $x_5$ $x_9$ $x_{10}$ $RHS$ $x_4$ $\frac{2}{3}$ -1 $\frac{5}{6}$ $\frac{29}{6}$ $x_1$ 0 0 -1 6 $x_3$ 0 -1 0 1 $x_2$ $\frac{2}{3}$ 0 $\frac{1}{3}$ $\frac{10}{3}$ $x_7$ $-\frac{2}{3}$ 0 $-\frac{1}{3}$ $\frac{5}{3}$ $x_8$ $-\frac{2}{3}$ 0 $-\frac{1}{3}$ $\frac{2}{3}$ $x_6$ $-\frac{2}{3}$ $\frac{5}{2}$ $-\frac{1}{3}$ $\frac{1}{6}$ $\bar{d}^1$ $-\frac{10}{3}$ $-\frac{1}{2}$ $\frac{7}{6}$ $\frac{115}{6}$
Optimal simplex table for node 6
 $\mathcal{B}_6$ $x_9$ $x_{10}$ $x_{11}$ RHS $x_4$ -1 $-\frac{1}{2}$ 1 5 $x_1$ 0 1 0 5 $x_3$ -1 0 0 1 $x_2$ 0 0 0 3 $x_5$ 0 $-\frac{1}{2}$ $-\frac{3}{2}$ 1 $x_8$ 0 0 -1 1 $x_{6}$ $\frac{5}{2}$ 0 -1 $\frac{1}{2}$ $x_7$ 0 0 -1 2 $\bar{d}^1$ $-\frac{1}{2}$ $-\frac{1}{2}$ -5 17 $\bar{d}^2$ 1 0 0 1 $\bar{c}^1$ -1 -1 2 -2 $\bar{c}^2$ $-\frac{1}{2}$ 0 -2 $\frac{11}{2}$ $\bar{c}^3$ -1 -1 0 4
 $\mathcal{B}_6$ $x_9$ $x_{10}$ $x_{11}$ RHS $x_4$ -1 $-\frac{1}{2}$ 1 5 $x_1$ 0 1 0 5 $x_3$ -1 0 0 1 $x_2$ 0 0 0 3 $x_5$ 0 $-\frac{1}{2}$ $-\frac{3}{2}$ 1 $x_8$ 0 0 -1 1 $x_{6}$ $\frac{5}{2}$ 0 -1 $\frac{1}{2}$ $x_7$ 0 0 -1 2 $\bar{d}^1$ $-\frac{1}{2}$ $-\frac{1}{2}$ -5 17 $\bar{d}^2$ 1 0 0 1 $\bar{c}^1$ -1 -1 2 -2 $\bar{c}^2$ $-\frac{1}{2}$ 0 -2 $\frac{11}{2}$ $\bar{c}^3$ -1 -1 0 4
Optimal simplex table for node 8
 $\mathcal{B}_8$ $x_5$ $x_9$ $x_{11}$ RHS $x_4$ -1 -1 $\frac{5}{2}$ 4 $x_2$ 0 0 1 3 $x_3$ 0 -1 0 1 $x_1$ 2 0 -3 7 $x_6$ 0 $\frac{5}{2}$ -1 $\frac{1}{2}$ $x_7$ 0 0 -1 2 $x_8$ 0 0 -1 1 $x_{10}$ 2 0 -3 1 $\bar{d}^1$ -1 $-\frac{1}{2}$ $-\frac{7}{2}$ 18 $\bar{d}^2$ 0 1 0 1 $\bar{c}^1$ -2 -1 5 0 $\bar{c}^2$ 0 $-\frac{1}{2}$ -2 $\frac{11}{2}$ $\bar{c}^3$ -2 -1 3 6
 $\mathcal{B}_8$ $x_5$ $x_9$ $x_{11}$ RHS $x_4$ -1 -1 $\frac{5}{2}$ 4 $x_2$ 0 0 1 3 $x_3$ 0 -1 0 1 $x_1$ 2 0 -3 7 $x_6$ 0 $\frac{5}{2}$ -1 $\frac{1}{2}$ $x_7$ 0 0 -1 2 $x_8$ 0 0 -1 1 $x_{10}$ 2 0 -3 1 $\bar{d}^1$ -1 $-\frac{1}{2}$ $-\frac{7}{2}$ 18 $\bar{d}^2$ 0 1 0 1 $\bar{c}^1$ -2 -1 5 0 $\bar{c}^2$ 0 $-\frac{1}{2}$ -2 $\frac{11}{2}$ $\bar{c}^3$ -2 -1 3 6
Optimal simplex table for the node 10
 $\mathcal{B}_{10}$ $x_6$ $x_{10}$ $x_{13}$ RHS $x_5$ $-\frac{3}{2}$ $-\frac{1}{2}$ $-\frac{15}{4}$ 4 $x_4$ 1 $-\frac{1}{2}$ $\frac{3}{2}$ 4 $x_3$ 0 0 -1 2 $x_7$ -1 0 $-\frac{5}{2}$ 4 $x_8$ -1 1 $-\frac{5}{2}$ 3 $x_9$ 0 0 -1 1 $x_2$ 1 0 $\frac{5}{2}$ 1 $x_1$ 0 1 0 5 $\bar{d}^1$ -5 $-\frac{1}{2}$ -13 $\frac{13}{2}$ $\bar{d}^2$ 0 0 1 2 $\bar{c}^1$ 2 -1 4 1 $\bar{c}^2$ -2 0 $-\frac{11}{2}$ 1 $\bar{c}^3$ 0 -1 -1 3
 $\mathcal{B}_{10}$ $x_6$ $x_{10}$ $x_{13}$ RHS $x_5$ $-\frac{3}{2}$ $-\frac{1}{2}$ $-\frac{15}{4}$ 4 $x_4$ 1 $-\frac{1}{2}$ $\frac{3}{2}$ 4 $x_3$ 0 0 -1 2 $x_7$ -1 0 $-\frac{5}{2}$ 4 $x_8$ -1 1 $-\frac{5}{2}$ 3 $x_9$ 0 0 -1 1 $x_2$ 1 0 $\frac{5}{2}$ 1 $x_1$ 0 1 0 5 $\bar{d}^1$ -5 $-\frac{1}{2}$ -13 $\frac{13}{2}$ $\bar{d}^2$ 0 0 1 2 $\bar{c}^1$ 2 -1 4 1 $\bar{c}^2$ -2 0 $-\frac{11}{2}$ 1 $\bar{c}^3$ 0 -1 -1 3
Optimal simplex table for node 11
 $\mathcal{B}_{11}$ $x_4$ $x_6$ $x_{13}$ RHS $x_5$ -1 $-\frac{5}{2}$ $-\frac{21}{4}$ 0 $x_3$ 0 0 -1 2 $x_7$ 0 -1 $-\frac{5}{2}$ 4 $x_8$ 0 -1 $-\frac{5}{2}$ 3 $x_{10}$ 2 2 3 7 $x_{11}$ 0 -1 $-\frac{5}{2}$ 2 $x_{12}$ 0 -1 $-\frac{5}{2}$ 1 $x_9$ 0 0 -1 1 $x_2$ 1 0 $\frac{5}{2}$ 1 $x_1$ 2 2 3 13 $\bar{d}^1$ -1 -6 $-\frac{29}{2}$ $\frac{21}{2}$ $\bar{d}^2$ 0 0 3 6 $\bar{c}^1$ -2 0 1 9 $\bar{c}^2$ 0 -2 $-\frac{11}{2}$ 1 $\bar{c}^3$ -2 -2 -4 11
 $\mathcal{B}_{11}$ $x_4$ $x_6$ $x_{13}$ RHS $x_5$ -1 $-\frac{5}{2}$ $-\frac{21}{4}$ 0 $x_3$ 0 0 -1 2 $x_7$ 0 -1 $-\frac{5}{2}$ 4 $x_8$ 0 -1 $-\frac{5}{2}$ 3 $x_{10}$ 2 2 3 7 $x_{11}$ 0 -1 $-\frac{5}{2}$ 2 $x_{12}$ 0 -1 $-\frac{5}{2}$ 1 $x_9$ 0 0 -1 1 $x_2$ 1 0 $\frac{5}{2}$ 1 $x_1$ 2 2 3 13 $\bar{d}^1$ -1 -6 $-\frac{29}{2}$ $\frac{21}{2}$ $\bar{d}^2$ 0 0 3 6 $\bar{c}^1$ -2 0 1 9 $\bar{c}^2$ 0 -2 $-\frac{11}{2}$ 1 $\bar{c}^3$ -2 -2 -4 11
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