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Because of their intrinsic characteristics of hard computability, they cannot be solved accurately by efficient algorithms up to now. Since these problems have many applications in real situations, it is quite important to find some applicable algorithms.

由于难计算是这类问题的固有性质，因此它们目前尚无法用有效算法精确求解，但这些问题在现实领域中有着许多广泛的应用，因而寻找其实际而有效的算法就显得颇为重要了。

All of the computation and dynamic control problems of the biped robots, such as dynamic modelling, computation of ZMP, mass center and driving torques, as well as impact between the robot and ground, can be solved by using DYSISBL.

第二章从控制的角度讨论了两足机器人的综合设计问题。为使机器人能在非结构环境下实现动态行走，设计了两足机器人多级递阶控制系统。

The performance time of an algorithm is a function of the size of the computational problem to be solved.

一个算法的执行时间是要解决的计算问题规模的函数。

The problem in the stability of the penstock under external pressure can be solved in real-time. Computing the element stiffness matrix is the key of real-time computation.

压力钢管外压稳定问题可以采用实时求解方法，实时求解的关键在于单元刚度矩阵的计算。

Properties of efficient portfolios and the efficient frontier to the model are systematically analyzed. Our main results concerning the properties are: every efficient portfolio can be solved by minimizing portfolio risk under a given level of portfolio return or by maximizing portfolio return under a given level of portfolio risk; on the efficient frontier, the risk is a convex and strictly increasing function of the return and the return is a concave and strictly increasing function of the risk; the utility function on the efficient frontier can be expressed as a quasi-concave function of the risk or the return if the investor's utility function is quasi-concave.

从理论上系统地对该模型下的有效投资组合和有效前沿的性质进行了分析，结果表明：每一个有效投资组合可通过在给定期望收益水平的条件下最小化投资组合风险来获得，或者在给定风险水平的条件下最大化期望投资组合收益来获得；在有效前沿上，风险是收益的严格单调递增凸函数，收益是风险的严格单调递增凹函数；当投资者的效用函数是拟凹函数时，则有效前沿上的效用可表达成风险或收益的拟凹函数。

One or two instances will show how such objections may readily be solved, with the aid of a concordance.

一个或两个例子显示如何将这种反对可能会随时得到解决，与援助的和谐。

The material strength match of grouted concrete block masonry must be solved in engineering design.

砼砌块砌体中材料强度匹配问题是工程设计中需要解决的问题。

This language can be extended when components are well designed. By the introduction of a data type conversion function in the edge design and can-connect function in input terminal, the extended data flow language successfully solved the data conversion between different data types. It is a difficult problem in data flow language to realize conditional jump and recursion, however, by using the mechanism of active condition, this dissertation solves the problem well.

相比其它现有的数据流语言，扩展数据流语言具有以下特点：元件设计中定义了一种可激活函数，不同类型的节点允许定义各自的可激活条件，通过合理设计虚拟仪器元件，可以扩展语言的功能；在边的定义中引入类型转换函数，在输入端的设计中引入可连接函数，从而解决了不同数据类型之间数据传递的问题；在数据流语言中实现条件分支与循环通常是具有挑战性的一个问题，本文采用可激活函数的机制给出了一种解决方法。

In the past, the confidence limit problem of three-parameter Weibull distribution has not been solved, so that the creditability of its result can not be guaranteed, that is, only the result that its creditability is equal to 50% can be obtained using old methods.

由于以往三参数威布尔分布的置信度问题一直没有解决，所以其结果的可信程度也就无法得到保证。此时，也可以说它只能给出可信程度为50％的结果。

Weibull distribution is widely used as a life distribution, and estimating lower confidence limit of reliability is important. But so far this problem has not been well solved if when the sample size is small.

威布尔分布是使用非常广泛的寿命分布，关于威布尔分布的可靠度的下限估计是一个有重要意义的问题，文献中有很多讨论，但当样本量较小时，关于二参数威布尔分布的可靠度的下限估计至今没有非常有效的方法。

I hope that this success is just the first in a long series.

我希望这只是成功的开始。

Three dimensional stresses on the interface of tire and soil, tire deflection and soil sinkage are measured.

测试轮胎——沙土界面上的三向应力、轮胎变形和沙土沉陷；建立考虑剪切应力对沙土承载特性产生影响的车轮牵引性能预测模型；分析车轮作用下土壤的纵向稳定性。