进一步研究了采用重要性抽样技术提高抽样效率的问题。
And the importance sampling technique is applied to improve the sampling efficiency.
应用该方法可以大大提高小概率事件的抽样效率，文中给出一组仿真结果对照。
Using the way, the sampling efficiency for small-probability events can be improved considerably, as can be seen from the contrasts shown in a group of results of simulation.
分析和实际模拟表明，在以正态分布进行抽样的前提下，应用优化的参数，可使抽样效率进一步提高。
Theoretical analysis and the actual simulation all indicate that the sampling efficiency can be increased significantly by using these optimum parameters.
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