In this paper, we analysis the defects of least variance method, and advance a least second moment method of the futures hedging.
在本文我们分析最小方差法存在的缺陷，提出了套期保值的最小二阶矩方法。
The numerical method represents a coupling between the optimum method of advance and retreat and the finite element analysis for the design on large hoist drums of cranes that is an actual structure.
采用空间薄壁板壳元与空间梁元混合离散模型对大吨位起重机钢丝绳缠绕卷筒进行有限元分析，将有限元方法与进退法优化方法耦合形成数值算法进而对卷筒进行优化设计。
It is demonstrated that the method is advance in technology and the measured data are precise by both error analysis of measurement and field practice.
从测量误差分析及现场实践证明，该方法技术先进，测量数据精确。
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