The effects of correlation among observations on the consistency property of sample variance

It is well known that even when the sample observations are correlated and not normal the sample variance, S² converges in probability to E(S²). But the required sample size for S² to be a consistent estimator of E(S²) is an open question. Some light is shed on this question in this paper. In particular the relation between the rate of convergence and the correlation property of the observations is explored. It is shown that the retardation to the rate of convergence is not appreciable if the correlation is moderate but it can be severe for extreme correlations.     

软件无线电中正交数字变频的DSP实现

介绍了软件无线电的概念及DSP基本原理,利用DSP实现软件无线电中的正交数字变频技术,给出了中频下变频的数字化实现的主程序.     

骨形成过程中两条重要的信号传导通路

Wnt信号通路与BMP-2信号通路能够促进成骨细胞的分化和成骨细胞分泌的胞外基质的生物矿化,在这一过程中起着极其重要的作用.本文主要综述了,近年来对这两条信号通路研究的最新进展.     

The Difficult History of Ancillary Units: The Obstacles and Potential Opportunities to Increase the Heterogeneity of Neighborhoods and the Flexibility of Households in the United States

ABSTRACT

Most aging Americans express the desire to stay in their current home for the rest of their lives. However, as literature and practice indicate, aging in place cannot be successfully achieved in all places, especially in those places where zoning regulations and building codes act as barriers to the flexible adaptation of environments. One possible solution could come from the legalization of what is commonly known as granny flats, or more technically as Ancillary Dwelling Units. This article is divided into three parts. The first part is a brief history of Ancillary Dwelling Units. The second part focuses on the critical role played by local and state urban planning policies in the future of Ancillary Dwelling Units. California is used as a noteworthy example. The third part discusses how positive outcomes for senior residents who have Ancillary Dwelling Units legally present in their neighborhoods are linked to the appropriateness of their design.     

The Special Historical Section of the Journal of American College Health

Abstract

Objective: To identify human papillomavirus (HPV) infection and HPV vaccine–related attitudes among college-aged women and the relationship between HPV vaccine uptake and subsequent sexual behaviors. Methods: PubMed, MEDLINE, CINAHL, and Google Scholar searches were performed from 2006, the date after the first HPV vaccine became available, to present. Results: Of the 13 studies identified, most were cross-sectional. College-aged women saw HPV infection as serious and had positive attitudes toward the HPV vaccine. Barriers (ie, cost, lack of insurance coverage) existed that prevented women from obtaining the vaccine and many women did not see themselves at risk for HPV. The vaccine uptake rate, although increasing, has been slow. Conclusion: College-aged women in the United States may need unbiased information about HPV and HPV vaccine. Studies that focus on risk perception and the relationship between knowledge, attitudes, vaccine uptake, and sexual behaviors are needed to inform interventions and public health programs.     

Alternative Medicine and Herbal Use Among University Students

Abstract

Objective: This study sought to (1) examine perceived stress and resources to cope with stress as predictors of emotional eating during the transition to college and (2) determine whether body mass index (BMI) moderated the emotional eating-stress relationship. Participants: Participants were 97 college freshmen (73% female; BMI: M = 25.3 kg/m², SD = 5.7 kg/m²). Research was conducted in September 2012. Methods: Participants completed the Perceived Stress Scale, Emotional Eating Scale, and Eating and Appraisal Due to Emotions and Stress Questionnaire during the first month of college. Height and weight were measured objectively. Results: BMI moderated the relationship between perceived stress and emotional eating. Higher stress predicted greater emotional eating for the lower BMI groups, but not the highest group. Greater resources to cope with stress predicted lower emotional eating. Conclusions: Greater perceived stress and poorer resources to cope with stress may contribute to emotional eating during the transition to college. The relationship between perceived stress and emotional eating may vary by BMI.     

Principles of Total Quality Management and Their Application to Employee Assistance Programs:

Total quality management (TQM) has been thrust into the psyche of corporate America. TQM is not a new phenomena. Introduced in the early fifties to Japanese managers by an American management expert, it served to make Japan an international economic leader. U.S. companies have generally had little international competition. They now recognize he formidable challenge that quality based companies represent and are striving to replicate these successes. To do so will be to remain competitive. To discount the impact of TQM initiatives could spell economic disaster. Employee assistance program (EAP) management is modeled after American management principles. EAPs are also now having to compete for market share in ways for which they were never prepared. The TQM initiatives currently being implemented in many companies may be applied equally well to EAPs. This article presents an overview of the TQM principles formulated by W. Edwards Derning. The article also attempts to critically analyze some of the areas that have been problematic in EAP management. Further, it examines how TQM initiatives could serve to ameliorate some of these problems and lend additional impetus to the competitiveness of employee assistance programs with other behavioral health care service delivery and cost management programs.     

Four tests of fit for the beta-binomial distribution

Tests based on the Anderson–Darling statistic, a third moment statistic and the classical Pearson–Fisher X ² statistic, along with its third-order component, are considered. A small critical value and power study are given. Some examples illustrate important applications.     

Constructing identity with L2: Pronunciation and attitudes among Norwegian learners of English1

This study investigates L2 pronunciation and evaluation of American and British varieties of English among Norwegian adolescent learners. By integrating quantitative sociolinguistics and L2 acquisition, the article investigates stylistic practice in an L2 context. Results from an auditory analysis of four phonological variables and a matched‐guise test are interpreted with reference to speaker commentary. Learners’ self‐expressed accent aims correlate significantly with accent use, but American English is the dominant pronunciation. Results show that both L1 and L2 speakers of English varieties are socially evaluated by the learners; British English is considered the most prestigious model of pronunciation, while American English is associated with informality. These evaluations seem to motivate learners’ pronunciation choices. The data indicate blended use of the English varieties. Learners seem to exploit linguistic resources from English, and reshape and adapt the social meaning of the variables to a local construction of identity.     

网络的类市场环境与道德的自发生成

历史及事实皆显示道德在很大程度上沿自生自发的发展路径生成.网络实践较为明显地带来了个人的自主与自由,尤有价值的是文化上的自主性.网络环境是类市场环境,这种类市场环境的特征会逐步促使无数上网个体的自主性的觉醒,进一步确立起个体作为责任主体和道德主体的地位,最终有助于个体道德的生长.网络的类市场环境不仅有助于道德的自发生长,且意外地使自由、自主与道德三者形成了互相促进、相得益彰的关系.已经和正在展现的事实都表明网络的类市场环境让个体的自由、自主与道德获得了前所未有的发展空间,道德因素在网络世界愈发显示出其重要性和力量,并辐射与作用于现实社会.这使我们依然可以对信息时代的道德充满信心.