Table 18 Objective function values and CPU times of the considered solution approaches (SOA and SA).

From: A multi-objective fuzzy programming model for port tugboat scheduling based on the Stackelberg game

Example(population size, Iterations’ number)

SOA

SA

Objective value

Average value

CPU time (seconds)

Objective value

Average value

CPU time (seconds)

1(50,100)

55,945.80

57,726.35

59.24

55,945.80

57,542.33

60.57

2(50,100)

56,040.66

57,861.42

61.58

56,040.66

57,489.30

62.35

3(50,100)

56,135.52

58,365.86

67.23

56,135.52

58,567.41

68.47

4(50,100)

56,230.38

58,751.93

73.55

56,230.38

58,698.75

72.57

5(50,100)

56,325.24

59,537.23

78.29

56,325.24

59,547.20

79.58

6(100,150)

56,420.10

59,943.07

85.20

56,420.10

59,846.21

87.25

7(100,150)

59,919.15

63,679.45

92.17

59,919.15

62,756.05

94.33

8(100,150)

63,418.20

65,307.59

101.34

63,418.20

65,789.62

103.58

9(100,150)

66,917.25

68,247.35

107.46

66,917.25

68,574.10

108.37

10(100,150)

70,416.30

72,354.21

116.74

73,687.38

75,123.60

117.22

11(200,300)

74,547.09

76,523.46

131.08

74,869.32

75,741.59

132.62

12(200,300)

78,258.60

80,359.31

156.92

78,569.27

79,482.39

157.54

13(200,300)

81,569.54

83,497.25

177.54

81,569.68

83,498.62

177.84

14(200,300)

85,154.62

86,764.59

191.95

85,476.57

87,258.93

190.35

15(200,300)

87,637.52

89,576.48

219.51

87,739.51

89,328.43

218.26

16(250,350)

92,048.75

93,597.56

236.04

92,468.53

93,663.42

237.08

17(250,350)

94.967.43

95,267.24

248.16

94,246.08

96,272.51

251.49

18(250,350)

95,241.03

96,513.76

267.86

95,547.21

97,635.55

270.30

19(250,350)

97,537.89

98,421.32

296.49

97,637.42

99,884.21

299.57

20(250,350)

98,468.37

99.637.21

319.43

98,787.37

100,699.30

322.01

21(300,400)

100,257.16

101,576.35

341.58

100,384.65

102,587.47

345.24

22(300,400)

101,864.45

103,468.73

359.24

101,657,52

103,767.66

361.35

23(300,400)

103,423.72

105,374.68

387.41

103,423.80

105,154.35

388.75

24(300,400)

104,819.47

105,954.27

426.33

104,523.14

105,928.64

428.31

25(300,400)

106,754.80

108,469.30

462.69

106,639.25

108,637.20

464.78

26(400,500)

109,057.15

110,863.47

486.26

109,394.33

110,852.94

491.95

27(400,500)

111,967.53

112,637.20

508.52

111,638.32

112,264.21

512.22

28(400,500)

113,067.64

115,563.19

524.61

113,207.42

115,885.43

529.25

29(400,500)

116,324.99

118,465.17

552.03

116,389.76

118,525.56

558.66

30(400,500)

119,384.20

120,742.95

563.80

119,627.20

120,541.13

569.24

31(450,600)

120,932.26

121,649.39

589.58

121,159.34

123,288.95

595.19

32(450,600)

122,132.68

123,847.46

603.39

122,415.66

124,963.47

608.49

33(450,600)

123,256.53

125,498.25

625.48

123,854.57

125,227.30

628.65

34(450,600)

126,568.32

127,864.59

636.05

126,837.62

127,626.08

640.09

35(450,600)

127,820.60

128,657.34

659.83

128,687.04

130,212,32

662.43

36(500,700)

129,104.37

130,378.92

670.54

129,563.18

131,545.17

672.62

37(500,700)

129,634.90

132,156.36

695.71

130,691.36

132,682.66

701.31

38(500,700)

131,196.84

133,468.37

716.43

131,257.86

133,236.52

715.60

39(500,700)

131,541.22

133,835.96

723.28

131,630.54

133,894.54

726.42

40(500,700)

131,935.70

133,579.63

742.60

132,045.75

134,427.70

748.05

41(600,900)

132,309.08

134,549.05

754.26

132,952.34

134,853.64

756.35

42(600,900)

133,865.24

134,687.54

772.13

133,985.47

135,527.41

786.20

43(600,900)

134,286.12

136,579.58

785.02

135,204.55

137,152.86

793.84

44(600,900)

134,683.07

136,289.67

811.24

135,810.21

137,656.28

816.32

45(600,900)

136,335.68

138,479.53

836.37

137,023.68

139,726.01

839.33