Download Advances in Computation and Intelligence: Second by Zhuo Kang, Lishan Kang, Xiufen Zou, Minzhong Liu, Changhe PDF

By Zhuo Kang, Lishan Kang, Xiufen Zou, Minzhong Liu, Changhe Li, Ming Yang, Yan Li (auth.), Lishan Kang, Yong Liu, Sanyou Zeng (eds.)

This booklet constitutes the refereed lawsuits of the second one foreign Symposium on Intelligence Computation and purposes, ISICA 2007, held in Wuhan, China, in September 2007. The seventy one revised complete papers have been rigorously reviewed and chosen from approximately 1000 submissions. the themes contain evolutionary computation, evolutionary studying, neural networks, swarms, development popularity, information mining and others.

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14 J. Zheng et al. crowding strategy factually. The problem is that the density estimations in the above three MOEAs are more simple. There are often a number of individuals surrounding a particular point and influencing its density. However, only a few of individuals are considered in the above three density estimation methods. The density is really important to maintain the diversity of solutions in MOEAs. In this paper, we suggest a method of density estimation for crowding strategy to maintain the diversity of solutions.

The two extreme solutions are shown in table. It is interesting to note that the minimum launch velocity solution obtained by GOSpel is almost similar to that obtained by SC. Both Numerit and SC do not allow to find a solution corresponding to minimum time of flight. The minimum time solution obtained by GOSpel takes only 50 days to reach Mars from Earth, by requiring about seven times more launch velocity. 3 shows the Pareto-optimal frontier obtained by GOSpel. The arrival and departure times for each of these solutions are also shown in the same figure.

In 1925, Walter Hohmann [9] designed the transfer trajectory for two non intersecting orbits, which later has been used for direct transfer from one planet to another planet. Cornelisse [6] studied the various methods for computation of interplanetary trajectory and showed that interplanetary trajectories were most efficiently accomplished by the method of patched conics. Miele and Wang [10] presented fundamental properties of optimal orbital direct transfer using the cases of transfer from Earth orbit to Mars orbit and from Earth orbit to Venus orbit.

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