MTEMcell中场的均匀性分析

利用直线法对具有任意宽度芯板的变形横电磁波小室（ＭＴＥＭｃｅｌｌ）进行了分析，得出了电场分布的计算公式。根据数值计算结果，讨论了ＭＴＥＭｃｅｌｌ中场分布的均匀性，并计算了特性阻抗。     

非平衡非均匀业务与ATM交换性能

研究了非平衡与非均匀业务对于输出缓冲型ATM交换系统性能的影响,分析表明输入业务的非平衡性对交换性能无影响,但非均匀性却有着严重的影响,计算机模拟证实了理论分析所得出的结论。     

Measurements of separation among probability densities or random variables

Distance between two probability densities or two random variables is a well established concept in statistics. The present paper considers generalizations of distances to separation measurements for three or more elements in a function space. Geometric intuition and examples from hypothesis testing suggest lower and upper bounds for such measurements in terms of pairwise distances; but also in L_p spaces some useful non-pairwise separation measurements always lie within these bounds. Examples of such separation measurements are the Bayes probability of correct classification among several arbitrary distributions, and the expected range among several random variables.     

Estimation of Missing Cells in Randomized Block and Latin Square Designs

Classical missing cell formulas for the randomized block design and Latin square design are derived using the modified cell means model. The role of the assumptions of no interaction for these designs is made clear in the development. Examples are given for the randomized block and Latin square.     

ON CLASSIFICATION OF A BIVARIATE BINARY OBSERVATION

Classification of a bivariate binary observation into one of the two possible groups requires the estimation of the joint cell probabilities under each of the two groups. Two widely used approaches for the estimation of such joint cell probabilities are: [1] Seber, G. A. F. 1984. Multivariate Observations New York: John Wiley and Sons. [Crossref] , [Google Scholar] kernel based non-parametric approach; and [2] McLachlan, G. J. 1992. Discriminant Analysis and Statistical Pattern Recognition New York: John Wiley and Sons. [Crossref] , [Google Scholar] multinomial distribution based cell counts approach. In these traditional approaches, the joint cell probabilities are estimated without making any assumptions about the structural forms for these probabilities. Consequently, it is not clear, how these traditional approaches take into account the correlation that may exist between the 2-dimensional binary observations. In this paper, we model the cell probabilities by a suitable bivariate binary distribution which accommodates the correlation in a natural way, and examine the effect of this type of modelling in classifying a new correlated binary observation into one of the two groups. This is done by comparing the probability of misclassification yielded by the proposed model based approach with those of the kernel as well as multinomial distribution based approaches. It is shown through a simulation study that the probabilities of misclassification for the model based approach are substantially smaller than those of the other two approaches. We illustrate the use of the proposed model based approach in classification by analyzing a combined data from two epidemiological surveys of 6–11 year old children conducted in Connecticut, the New Haven Child Survey (NHCS) and the Eastern Connecticut Child Survey (ECCS).     

Athletes’ Perceptions of National Collegiate Athletic Association–Mandated Sickle Cell Trait Screening: Insight for Academic Institutions and College Health Professionals

Abstract

Objective: The study objective was to explore athletes’ perspectives of National Collegiate Athletic Association (NCAA)–mandated sickle cell trait (SCT)–screening policy by examining race- and gender-related differences in athletes’ perceptions regarding risk of having SCT and concern about loss of playing time. Participants: Participants were 259 athletes at a southeastern United States campus during April–August of 2010. Methods: Athletes completed a 21-question survey. Results: The majority of athletes (81.7%) perceived that they would have a high level of concern if found to carry the SCT. African Americans were 9.07 times more likely than Caucasians to perceive risk of having the SCT. The majority of athletes disagreed (38.4%) or did not know (50.8%) if they would lose playing time related to carrying the SCT. Conclusion: Campus health professionals must be aware of athletes’ perspectives on NCAA's SCT screening so that athletes are not unnecessarily subjected to stress or harm.     

产业集群多层次网络结构对集群风险扩散的影响

文章分析了产业集群网络结构对集群的风险抵御能力的影响机理。利用温州鞋革业集群、东莞玩具业集群、硅谷和128公路区集群等案例对该影响机理进行了论证,并运用仿真模拟方法构建了集群结构模型,刻画了在外生性风险和内生性风险的扩散过程中集群结构的动态演化。主要结论有:马歇尔集群网络具有无标度网络和小世界网络的拓扑结构属性,轮轴式集群网络具有接近无标度网络极限状态的结构属性;两类集群对外生性风险扩散的抗性显著高于其对内生性风险扩散的抗性;马歇尔集群对内生性风险的抵御能力优于轮轴式集群,而轮轴式集群对外生性风险抗性则相对较强。     

论人在微生物工业中的被动性和主观能动作用

人在发酵工业生产中处于被动的地位。微生物的生存利益与人类的经济利益 ,也就是微生物的生命活动规律和人的主观意志 ,既是对立的 ,又是统一的 ;发酵工程领域的科学家和工程师的工作就在于努力促使对立向统一的转化。“微生物生物机器”的创新思路和发酵工程的生物学理论 ,为促进其转化提供了一个思维框架。     

A Cellular Dynamics Model of Experimental Bladder Cancer: Analysis of the Effect of Sodium Saccharin in the Rat

To make the methodology of risk assessment more consistent with the realities of biological processes, a computer-based model of the carcinogenic process may be used. A previously developed probabilistic model, which is based on a two-stage theory of carcinogenesis, represents urinary bladder carcinogenesis at the cellular level with emphasis on quantification of cell dynamics: cell mitotic rates, cell loss and birth rates, and irreversible cellular transitions from normal to initiated to transformed states are explicitly accounted for. Analyses demonstrate the sensitivity of tumor incidence to the timing and magnitude of changes to these cellular variables. It is demonstrated that response in rats following administration of nongenotoxic compounds, such as sodium saccharin, can be explained entirely on the basis of cytotoxicity and consequent hyperplasia alone.     

模糊信元丢弃:一种公平有效机制的研究

提出了一种基于模糊逻辑的信元丢弃机制,该新机制不仅是丢弃具有低级信元丢弃优先权的信元,而且能较公平地丢弃网络资源消耗量最小的信元。定义了对称模糊集,并给出了两个性质;建立了通过模糊推理计算网络资源有效性及信元丢弃公平性对信元丢弃的模糊定量关系,并以此确定了相应的信元选择规则。模拟分析表明,该机制可在公平性基础上较明显地减小因丢弃信元而导致的网络资源损失。