Social Competence in Preschool Children: Replication of Results and Clarification of a Hierarchical Measurement Model

This study tested assumptions and conclusions reached in an earlier confirmatory factor analysis (CFA) study of the social competence (SC) construct for preschool children. Two samples (total N = 408; a new Portuguese sample and one from US samples that had participated in the original study) contributed data. Seven SC indicators were tested for mean differences across age, sex, and sample. Significant sex differences were found for peer acceptance (favoring girls) and for initiating affectively neutral interactions (boys had higher rates), and the sex by sample interaction also was significant for initiating interactions (i.e., effect significant only in the Portuguese sample). In CFAs, the hypothesized structure of SC fits the data and was invariant across sample and age within sample in both measurement and structural tests. The model was invariant at the measurement level for sex within sample tests, but not at the structural level. The results replicate and extend understandings of SC reported in the original study.     

The Effects of Participation Rate on the Internal Reliability of Peer Nomination Measures

Although low participation rates have historically been considered problematic in peer nomination research, some researchers have recently argued that small proportions of participants can, in fact, provide adequate sociometric data. The current study used a classical measurement perspective to investigate the internal reliability (Cronbach's α) of peer nomination measures of acceptance, popularity, friendship, prosocial behavior, and overt aggression. Data from 642 participants attending 10 schools were resampled at different participation rates ranging from 5 percent to 100 percent of the original samples. Results indicated that (1) the association between participation rate and Cronbach's α was curvilinear across schools and variables; (2) collecting more data for a given variable (by using unlimited vs. limited nominations, or two vs. one items) was significantly related to higher internal reliability; and (3) certain variables (overt aggression, popularity) were more reliable than others (acceptance, friendship). Implications for future research were discussed.     

Associations among Maternal Behavior,Delay of Gratification,and School Readiness across the Early Childhood Years

This study examined the developmental pathways from maternal behavior to school readiness within a sample of 1007 children, with a specific focus on the mediating role of delay of gratification (DoG). Maternal behavior across the first 36 months of age was explored as a predictor of children's DoG at 54 months as well as their behavioral and academic competence in kindergarten. Results support sensitivity as a predictor of children's DoG and indicate significant associations between DoG and teacher‐reported externalizing behavior, social skills, and academic skills. Moreover, DoG partially mediated the associations between maternal sensitivity and school readiness skills, with the highest percentage of mediation reported for social skills. Findings indicate maternal sensitivity and DoG as potential targets for efforts aimed at enhancing school readiness among young children.     

Uniform asymptotics for ruin probability of a two-dimensional dependent renewal risk model

ABSTRACT

In this paper we consider the tail behavior of a two-dimensional dependent renewal risk model with two dependent classes of insurance business, in which the claim sizes are governed by a common renewal counting process, and their inter-arrival times are dependent, identically distributed. For the case that the claim size distribution belongs to the intersection of long-tailed distribution class and dominant variation class, we obtain an asymptotic formula, which holds uniformly for all time in an infinite interval. Moreover, we point out that the formula still holds uniformly for all time in an infinite interval for widely dependent random variables (r.v.s) under some conditions.     

Estimation of the mean of the exponential distribution with an outlying observation

Given a life testing experiment consisting of n items, n-1 of which have the expected life λ while one could have an expected life λ/α with 0 < α < 1 the problem is. to find a mean square error (MSE) minimizing estimation function. The standard estimators for the homogeneous case (α = 1) overestimate the expected life and their MSE tend to infinity when a tends to 0.

Looking at the estimation problem as an insurance (see Anscombe (1960)) two different “testimators” are compared with respect to their MSE, Numerical results show that an estimation function based on the “Epstein-statistic” x_(n)/[xbar] is the best one.     

Overdispersed negative binomial regression models

Overdispersion is a common phenomenon in actual data sets. It is important to have methods of dealing with extra variation in regression situations. This article develops tests for extra-negative binomial variation and gives some numerical methods to deal with it. Simulations show power comparisons between some of the overdispersion tests discussed. Finally, an example is given to demonstrate the methods.     

Shy but Getting By? An Examination of the Complex Links Among Shyness,Coping, and Socioemotional Functioning in Childhood

The purpose of the current study was to test a conceptual model of the mediated and moderated associations among shyness, coping strategies, and socioemotional functioning in middle childhood. Participants were 358 children (177 boys) aged 9–13 years (M = 10.16 years, SD =.95). Children completed self‐report assessments of shyness, coping style in response to a social stressor, internalizing problems, and peer difficulties. Among the results, shyness was positively associated with internalizing symptoms and negatively related to perceptions of peer difficulties. However, both of these associations were partially mediated by internalizing coping styles. Moreover, problem‐solving coping moderated these mediated pathways: among children who reported higher levels of problem‐solving coping, the associations between internalizing coping and outcomes were attenuated. Several gender differences also emerged, suggesting that problem‐solving coping may be particularly useful for shy boys. Results are discussed in terms of the complex but potentially critical role of coping in shy children's socioemotional functioning.     

Head Cocoons

ABSTRACT

Listening with the aid of headphones was at the heart of the early radio culture of the 1920s. After those years, however, earphones became the exception as loudspeakers became the norm. For quite some time thereafter, the wiring of hearing was limited to the use of monaural earbuds in situations where the use of loudspeakers would have disturbed others. In West Germany, the binaural headphone started to make a comeback in the late 1960s due to the growing fragmentation of family life along with the widening range of electronic leisure possibilities and the rise of hi-fi culture. It was only at the end of the twentieth century, however, that binaural headphone listening emerged as the dominant culture of listening and caught up with the burgeoning mobile urban life style.

Taking the case of West Germany, this article asks: What is the impact of ear-wiring on social life? And, what new kinds of perception result from headphone listening? It traces how the use of earphones turned from being a static “technique of listening” into a mobile “technique of acoustic privatization.” Ultimately, this article interprets today's portable headphones as “head cocoons” that enable mobile listeners to actively carve out sonic privacy while on the move.     

基于C／S的煤矿生产调度信息管理系统开发与应用

煤矿生产调度是煤矿企业管理中安全生产的指挥中心，对煤矿的安全生产起到了至关重要的作用。在已建成的网络平台的基础上，开发基于C／S模式的煤矿调度管理信息系统（MIS），结合计算机网络技术、数据库技术和信息管理技术，实现矿级调度与集团总调度数据通信、信息资源共享和管理。     

网络新闻道德失范问题研究

伴随着互联网技术的不断发展，网络新闻以其独有的传播方式，逐渐改变着传统媒体的传播格局，并且也由此逐渐产生了侵权与虚假新闻等网络新闻道德失范方面的问题，这些问题阻碍了网络新闻的健康发展。针对网络新闻道德失范中存在的具体问题，在对其原因进行充分分析的基础之上，提出了有实效性的应对策略，以期推动网络新闻道德建设不断向前发展。