在调度约束条件分析和一些基本假设的基础上，本文建立了多卫星初始调度约束模型，并给出了模型求解的贪婪算法。
A constraint satisfaction scheduling model for the initial scheduling problem and a greedy algorithm for it are given based on the constraints analysis and some basic hypothesis.
计算实例表明，凸度缺口模型对于给定的初始值和约束条件，可以较好地减少利率风险的暴露头寸和提高收益；
Calculation case shows that in the given initial value and restraints, convexity gap model can lessen the exposure position of interest rate risk and increase yields.
通过对运输问题的约束条件的分析，重新设计了初始种群的生成方法，避免了对大量非可行解的处理。
It proposes a method to product initial feasible solutions of transportation problem, on the basis of its special constrained conditions, and the unfeasible solutions need not to care any more.
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