分段线性-非线性振动机械周期运动关于ω的分叉

利用点映射－胞映射法（简称ＰＣＭＡＳ）分析了分段线性－非线性振动机械的周期运动关于激振角频率ω的分叉情况，同时对Ｐ－２运动的稳定性进行了深入的研究，所得结论对于设计这类机械的指导意义。     

Alternative forms of fractional Brownian motion

It is pointed out that two contradictory definitions of fractional Brownian motion are well-established, one prevailing in the probabilistic literature, the other in the econometric literature. Each is associated with a different definition of nonstationary fractional time series, arising in functional limit theorems based on such series. These various definitions have occasionally led to some confusion. The paper discusses the definitions and attempts a clarification.     

Curve registration

Functional data analysis involves the extension of familiar statistical procedures such as principal components analysis, linear modelling, and canonical correlation analysis to data where the raw observation x_i is a function. An essential preliminary to a functional data analysis is often the registration or alignment of salient curve features by suitable monotone transformations h_i of the argument t , so that the actual analyses are carried out on the values x_i { h_i ( t )}. This is referred to as dynamic time warping in the engineering literature. In effect, this conceptualizes variation among functions as being composed of two aspects: horizontal and vertical, or domain and range. A nonparametric function estimation technique is described for identifying the smooth monotone transformations h_i , and is illustrated by data analyses. A second-order linear stochastic differential equation is proposed to model these components of variation.     

罚球肌肉运动感觉的心理训练

论述了罚球时肌肉运动感觉的训练方法,指出在训练中应要求运动员注重投篮时注意力的指向和集中,投篮成功后立刻进行对技术要领和动作的追忆,把投篮时的运动表象内化为形象思维.     

An invariance principle for triangular arrays of dependent variables with application to autocovariance estimation

The invariance principle for triangular arrays of dependent variables is studied. We use the concept of mixingale, proposed by McLeish (1975). Uniform bounds are imposed on the growth of conditional expectations with respect to distant predecessors. The theorem is applied to invariance principles for autocovariance estimates based on triangular arrays of time-series data for weak mixing sequences and linear processes. Such results are required for bootstrap applications.     

股票价格遵循分数Ornstein-Uhlenback过程的期权定价模型

本文从股价收益的时变性和波动的长记忆性两个方面考虑,建立了分数O-U过程;接着在分数风险中性测度下,利用分数情形下的Girsanov定理获得了分数O-U过程的唯一等价测度;进而采用拟鞅(quasi-martingale)定价方法,得到了分数市场环境中的期权定价模型,使得布朗运动和O-U过程驱动的期权定价模型均成为其特例;最后用算例,验证了长记忆参数H是期权定价中不可忽略的因素.     

基于企业激励理论的国有企业动力机制分析

所有者的动力是企业治理机制的原动力,是企业治理机制得以运转的保障。而这一动力在我国国有企业中却严重不足。造成这一现象的原因主要有我国国有企业终极财权的分离、现行的国有资产管理体制不完善,激发国有企业动力机制应该正确认识国有企业经营者的地位和作用,健全经理人员市场,建立选择经营者的有效制度以及设计有效的经营者激励与约束机制等方面入手。     

“过来”“过去”的用法及其认知解释

"过来""过去"是汉语中意义和用法比较丰富的一对趋向动词,其运动图式通过隐喻机制映射到时间、数量、心理、状态和事件等抽象认知域.各个认知域的"过来""过去"在语义特征上存在某些不同,其隐喻映射也存在某些对称和不对称.     

机器鱼运动建模

本文以水下航行体原理样机"机器鱼"为研究对象.分析了机器鱼的水动力特性以及推进系统的特殊性,建立了机器鱼的空间五自由度运动模型.