??电工学??远程多媒体教学软件设计

以《电工学》课程为例,从数据模型出发介质多媒体网络远程教学软件的设计方法。     

Integral computation relating to rational curves based on approximate degree reduction

A new algorithm is presented for computing the volume of revolution, moment of area and centroid etc. , which are related to the integration of rational curves. In this algorithm rational curve with high degree is firstly approximated by those with lower degree through endpoint interpolation. And finally the closed form integration solution is derived for quadratic rational curve. The diminishing rate of the minimum norm of the perturbation vector needed by degree reduction is 0(2" ") when the interval is subdivided at the midpoint. Combining the subdivision with the degree reduction, we can obtain a faster convergence of integration approximation. A series of integral error bound functions which are fairly simple to compute are derived. The examples given in this paper show that this algorithm is a simple and time-saving method in computing with small tolerance.     

物流系统的合理化研究

指出物流系统合理性提出的原因,并论述了物流系统合理性的体现、作用及途径。     

Forecasting the price of crude oil via convenience yield predictions

The paper develops an oil price forecasting technique which is based on the present value model of rational commodity pricing. The approach suggests shifting the forecasting problem to the marginal convenience yield, which can be derived from the cost‐of‐carry relationship. In a recursive out‐of‐sample analysis, forecast accuracy at horizons within one year is checked by the root mean squared error as well as the mean error and the frequency of a correct direction‐of‐change prediction. For all criteria employed, the proposed forecasting tool outperforms the approach of using futures prices as direct predictors of future spot prices. Vis‐à‐vis the random‐walk model, it does not significantly improve forecast accuracy but provides valuable statements on the direction of change. Copyright © 2007 John Wiley & Sons, Ltd.     

非线性发展方程的有理函数解

提出了求解非线性发展方程精确解的负幂指数展开法.利用这一方法,借助计算机的符号计算,求得了若干非线性发展方程的有理函数解.     

用二次有理Bézier曲线同时磨光任意多边形

根据有理Bézier曲线的性质,本文提出了一种能够用于同时磨光任意多边形的方法.利用这种方法,不仅可以调整磨光曲线对原始多边形的整体逼近程度,而且还可以对磨光曲线的形状进行局部地控制.     

体育教学中认知心理学相关理论的应用

认知心理学具有坚实心理学和教育学理论基础,认知心理学理论对改革大学体育教学具有指导意义和实用价值。运用认知心理学理论,探讨大学体育教学如何更好地发挥教师的指导作用,对以学生为主体的体育教学进行了有效的尝试。     

隐喻理解的认知研究

基于隐喻以及隐喻生成机制的理解,试图从认知的角度对隐喻的本质特征和主要认知理论的讨论作一分析,旨在进一步阐明隐喻现象是人类通过事物之间的相似性用某一领域的经验说明或理解另一领域的经验的认知活动;隐喻现象的认知及其意义的理解依赖于语言使用者双方所处的语境和具有的认知心理状态.     

安全态度改变与安全行为强化

企业职工对待安全的态度,是安全管理中的一个重要问题。本文着重研究安全态度转变的有关理论及强化职工安全行为的一些心理学方法。为了便于理解,在论述中尽可能结合煤矿安全管理中的一些实例予以说明。这些理论和方法对改进现场安全管理具有参考价值。     

微分法分解有理函数

根据有理函数及其导数性质 ,用微分法把有理函数分解为部分分式的和 ,给出了一次因式所对应的部分分式各系数和二次质因式前两对系数的计算公式 .此方法克服了初等恒等变换法通过解方程组确定系数 ,运算过程繁琐、计算量大的缺点 ,也体现了高等数学知识的连贯性