Procedure to identify outliers through cumulative distribution of extremes in a Gamma response model

This work aimed at proposing a procedure based on the cumulative distribution of maximums and minimums to identify outliers in generalized Gamma-response models. In order to validate such method, we used simulations scenarios defined by the combination of different samples, contamination rate and distributions with different degrees of asymmetry. In this context, probabilities related to errors in classification and accuracy were obtained by carrying by Monte Carlo simulations. Using cumulative distribution of extremes to identify outliers in a Gamma-response model is recommended, since it is not likely to present errors and was highly accurate in all assessed scenarios.     

Maximum likelihood vs. maximum goodness of fit estimation of the three-parameter Weibull distribution

The use of statistics based on the empirical distribution function is analysed for estimation of the scale, shape, and location parameters of the three-parameter Weibull distribution. The resulting maximum goodness of fit (MGF) estimators are compared with their maximum likelihood counterparts. In addition to the Kolmogorov–Smirnov, Cramer–von Mises, and Anderson–Darling statistics, some related empirical distribution function statistics using different weight functions are considered. The results show that the MGF estimators of the scale and shape parameters are usually more efficient than the maximum likelihood estimators when the shape parameter is smaller than 2, particularly if the sample size is large.     

基于BUPT-SK教学平台的教学设计

优秀的网络课程依赖于高质量的教学设计和支撑教学设计的多功能教学平台。首先以2010年国家网络精品课程＂数字通信原理＂为案例,介绍了具备支持各种个性化课程设计的北京邮电大学-思开（BUPT-SK）教学平台;然后详细分析了以学生为中心、引领式教学设计模式、学习对象设计、期望值理论、主动式的个性化学生支持服务等教学理念在教学设计中的具体应用;最后对使用效果和进一步的深入研究进行了探讨,其设计思想将对其他课程的教学设计有很好的借鉴意义。     

Fuzzy值连续函数与Fuzzy值函数的序列收敛

利用Ｆｕｚｚｙ数的Ｆｕｚｚｙ距离定义了Ｆｕｚｚｙ值连续函数的序列收敛，证明了Ｆｕｚｚｙ值连续函数与Ｆｕｚｚｙ值连续函数的和差仍是Ｆｕｚｚｙ值连续函数；如果Ｆｕｚｚｙ值函数序列的每项Ｆｕｚｚｙ值连续，则其极限也Ｆｕｚｚｙ值连续；在一致连续的条件下，积分号和极限号、微分号和极限号可交换．     

减缓渐开线齿轮支座振动的有效措施

在齿轮传动领域中，至今仍然普遍认为，只要主动齿轮的输入扭矩保持恒定，渐开线齿轮支座就不会产生振动。本文的研究充分表明，渐开线齿轮机的构运行时，它的支座不可避免地会发生一定程度的振动，作者对渐开线齿轮机构运行过程中支座实际反力变化规律作了系统的剖析及研究，并推导出渐开线齿轮支座实际反力计算式及支座实际反力波动率方程组。该齿轮支座实际反力波动率方程组所显示的严密的数学力学关系揭示了导致渐开线齿轮支座强迫振动的主要隐因素就是齿间滑动摩擦，深入的分析研究进一步表明，抑制齿轮支座强迫振动的重要措施是有效地降低齿间滑动摩擦系数、合理地调配齿数和传动化比以及严格地控制中心距增量系数。     

Random distances and edge correction

Two classes of random distances (generated as contact distances or free path lengths) external to a stationary random closed set in Euclidean space are introduced. The censored distance distributions within bounded region are obtained. Unbiased estimators of the random distance distribution functions using only the information from inside the bounded region are constructed.     

Robust tests for equality of two population means under the normal model

A robust procedure is developed for testing the equality of means in the two sample normal model. This is based on the weighted likelihood estimators of Basu et al. (1993). When the normal model is true the tests proposed have the same asymptotic power as the two sample Student's t-statistic in the equal variance case. However, when the normality assumptions are only approximately true the proposed tests can be substantially more powerful than the classical tests. In a Monte Carlo study for the equal variance case under various outlier models the proposed test using Hellinger distance based weighted likelihood estimator compared favorably with the classical test as well as the robust test proposed by Tiku (1980).     

从康德到鲍德里亚——基于“审美距离”的多维解读

距离概念的提出源于对文本的纯审美关注,古典主义美学家康德的"审美无功利"命题为其提供了理论支撑.在现代文学批评中,审美距离理论主要强调主体与文本的一种认知距离.当下文化研究的异军突起,使得对审美距离的阐释不再立足于审美心理与文本接受层面,而是体现为现代个体及其艺术对外在物化现实的审美超越上.在不同的阐释语境中,距离体现并表征着不同的审美文化形态和逻辑.     

Business Education: Real Time or Semester Time?

Both the context and content of management education are changing as new providers compete for market share. As education goes increasingly online and offcampus, many traditional universities will feel the effects of consolidation within their own ranks. Business schools will face additional pressure as corporate universities and Internet universities offer an economical and effective means of professional education. Unless MBA programs seize opportunities for creative collaboration, today’s potential partners will become tomorrow’s predators. This revised version was published online in July 2006 with corrections to the Cover Date.     

计算机绘图在求解线间距中的应用

针对线间距的求解问题，介绍了一种综合利用计算机技术及其绘图功能求得线间距的简捷方法．