... Optimum Design 591 18. 6 (Hock and Schittkowski, 1 981 )minimizesubject to 18. 7 (Hock and Schittkowski, 1 981 )minimizesubject to 18. 8 (Hock and Schittkowski, 1 981 )minimizesubject to xx2121250-≥xx12700 ... (1. 281 4E-03, 3.4050E-04),(2.2660E-07, 1.6638E-06), (2.5645E-01, 3.5256E-05). 18. 9 (Hock and Schittkowski, 1 981 )minimizesubject to 18. 10 (Hock and Schittkowski, 1 981 )minimizesubject to xxx13 ... 12 84 8 602 09,, ., , .,$,.where the parameters (bi, ci) (i = 1 to 8) are given as(3 .81 12E+00, 3.4604E-03), (2.0567E-03, 1.3514E-05),(1.0345E-05, 5.2375E-06), (6 .83 06E+00, 6.3000E- 08) ,(3.0234E-02,...