An Empirical Model of Perceived Mortality Risks for Selected U.S. Arsenic Hot Spots

Researchers have long recognized that subjective perceptions of risk are better predictors of choices over risky outcomes than science‐based or experts’ assessments of risk. More recent work suggests that uncertainty about risks also plays a role in predicting choices and behavior. In this article, we develop and estimate a formal model for an individual's perceived health risks associated with arsenic contamination of his or her drinking water. The modeling approach treats risk as a random variable, with an estimable probability distribution whose variance reflects uncertainty. The model we estimate uses data collected from a survey given to a sample of people living in arsenic‐prone areas in the United States. The findings from this article support the fact that scientific information is essential to explaining the mortality rate perceived by the individuals, but uncertainty about the probability remains significant.     

A Tighter Extra-Resource Analysis of Online Deadline Scheduling

This paper is concerned with online algorithms for scheduling jobs with deadlines on a single processor. It has been known for long that unless the system is underloaded, no online scheduling algorithm can be 1-competitive, i.e., matching the performance of the optimal offline algorithm. Nevertheless, recent work has revealed that some online algorithms using a moderately faster processor (or extra processors) can guarantee very competitive performance Kalyanasundaram and Pruhs, 2000 or even be 1-competitive Koo et al., 2002; Lam and To, 2001. This paper takes a further step to investigate online scheduling algorithms with an even higher performance guarantee (i.e., better than 1-competitive algorithms) and in particular, presents an extra-resource analysis of the earliest-deadline-first strategy (EDF) with respect to such a higher performance guarantee.A preliminary version of this paper has been accepted by The Australian Theory Symposium on Computing, 2004.This research was supported in part by Hong Kong RGC Grant HKU-7024/01E.     

Understanding Sheng Nu (“Leftover Women”): the Phenomenon of Late Marriage among Chinese Professional Women

In the past few decades, there has been a rise in the number of single, unmarried Chinese professional women, which is known as the sheng nu or “leftover women” phenomenon. Through an interactionist grounded theory method, this study has located the interactional constraints faced by 50 single Chinese professional women that were issued by their male romantic partners and parents, respectively. “Discriminatory” and “controlling” gendered constraints issued by the women's male suitors and partners reflected the persistence of the Chinese patriarchal structure, and this was found to be the leading cause of the women being “leftover” in the marriage market. Parents' traditional views continued to exert strong influences on the women's marital choices, but this was seen to conflict with their more “modern” views toward advocating and supporting the women's strong economic achievements. The four different types of Chinese professional women that were constructed based on their different partner choice strategies not only gave rise to an in‐depth and nuanced understanding of the sheng nu phenomenon in China, but could also be generalized toward understanding the marital choices of single professional women in other patriarchal societies who faced similar dilemmas in reconciling interactional constraints imposed by men and parents alike.     

Generational Differences in Work Values,Perceived Job Rewards,and Job Satisfaction of Chinese Female Migrant Workers: Implications for Social Policy and Social Services

This cross-sectional survey study is a pioneering attempt to investigate the generational differences in the work values, perceived job rewards, and job satisfaction of Chinese female migrant workers. The study targeted two toy factories in the Guangdong Province of China and recruited a total of 1,307 female workers as participants. Among them were 577 female migrant workers who comprised the target group for this research. The authors hypothesized that the younger generation of female migrant workers would have higher levels of cognitive work values (such as self-enhancement and career development) but lower levels of perceived job rewards and job satisfaction than those of the older generation. The results indicate that there are no generational differences in work values among the three birth cohorts of Chinese female migrant workers. The older generation felt more satisfied with the job rewards that they received, and their sense of job satisfaction was higher than that of the younger generation. Furthermore, the findings showed a substantial positive influence of perceived social job rewards (such as support from co-workers and supervisors) on job satisfaction among the younger generation. The current findings suggest that in China, generational differences in work are affected by both the generation factor and the rural–urban stratification factor. The authors hope that the study will provide a knowledge base for understanding the perceptions of Chinese female migrant workers toward work and for exploring the ways in which new policies and social services can be developed in order to address their needs.     

北宋重要诗案与诗歌发展的转向

诗案对诗歌的发展影响深远,是北宋诗歌和政治关系的一个重要切入点。北宋以儒立国,诗人以诗议政,发挥儒家政教精神,但屡屡因诗得祸。诗祸与新旧党争密切相连,从乌台诗案的政见之争,到车盖亭诗案的党同伐异,再到崇宁全面文禁的意气用事,始终贯穿着鲜明的政治特色。诗人的命运随着政党的得势与否而浮沉,而且波及的诗人一次比一次多。党派之间的权力之争、喜同恶异使诗人难以独善其身及保持创作的独立批评精神。诗人的创作经此连绵的政治打击,由经世致用转向寻求安身立命和追求纯粹技艺,崇宁四年(1105)后,北宋诗坛批评政治的诗歌陷入历史低谷。凡此,与北宋诗案的政治化本质而造成的负面影响息息相关。     

Predictors of Children's Rights Attitudes and Psychological Well‐being Among Rural and Urban Mainland Chinese Adolescents

This study examined rural and urban Chinese adolescents’ (13–19 years, N = 395) attitudes toward children's self‐determination and nurturance rights, and how these attitudes relate to various dimensions of socialization in their family and school environments, including perceptions of parental and teacher autonomy support and responsiveness and family and school democratic climate. Relations between these variables and psychological well‐being also were examined. Hierarchical regression analyses revealed that maternal responsiveness and teacher autonomy support predicted higher levels of endorsement of nurturance rights. Maternal autonomy support and tolerance of dissent at home predicted greater endorsement of self‐determination rights. Democratic climate in the home predicted higher life‐satisfaction and fewer depressive symptoms, even when parent and teacher autonomy support and responsiveness were controlled. Our findings suggest that environments that are structured more democratically and that are more responsive to children's autonomy needs are associated with higher levels of endorsement of children's rights and contribute to adolescents’ psychological health and well‐being in a non‐Western culture.     

Reconsidering Social Cohesion: Developing a Definition and Analytical Framework for Empirical Research

Despite its growing currency in academic and policy circles, social cohesion is a term in need of a clearer and more rigorous definition. This article provides a critical review of the ways social cohesion has been conceptualized in the literature in many cases, definitions are too loosely made, with a common confusion between the content and the causes or effects of social cohesion. This motivates us to propose a refined definition that we hope is clearer and more rigorous. We will show how our definition could be operationalized into a measurement scheme that facilitates empirical work on social cohesion.     

An optimal search procedure

Consider the following problem. There are exactly two defective (unknown) elements in the set X={x₁, x₂,…,x_n}, all possibilities occuring with equal probabilities. We want to identify the unknown (defective) elements by testing some subsets A of X, and for each such set A determining whether A contains any of them. The test on an individual subset A informs us that either all elements of the tested set A are good, or that at least one of them is defective (but we do not know which ones or how many). A set containing at least one defective element is said to be defective. Our aim is to minimize the maximal number of tests. For the optimal strategy, let the maximal test length be denoted by l₂(n). We obtain the value of this function for an infinite sequence of values of n.     

Effects of Surface Material,Ventilation, and Human Behavior on Indirect Contact Transmission Risk of Respiratory Infection

Infectious particles can be deposited on surfaces. Susceptible persons who contacted these contaminated surfaces may transfer the pathogens to their mucous membranes via hands, leading to a risk of respiratory infection. The exposure and infection risk contributed by this transmission route depend on indoor surface material, ventilation, and human behavior. In this study, quantitative infection risk assessments were used to compare the significances of these factors. The risks of three pathogens, influenza A virus, respiratory syncytial virus (RSV), and rhinovirus, in an aircraft cabin and in a hospital ward were assessed. Results showed that reducing the contact rate is relatively more effective than increasing the ventilation rate to lower the infection risk. Nonfabric surface materials were found to be much more favorable in the indirect contact transmission for RSV and rhinovirus than fabric surface materials. In the cases considered in this study, halving the ventilation rate and doubling the hand contact rate to surfaces and the hand contact rate to mucous membranes would increase the risk by 3.7–16.2%, 34.4–94.2%, and 24.1–117.7%, respectively. Contacting contaminated nonfabric surfaces may pose an indirect contact risk up to three orders of magnitude higher than that of contacting contaminated fabric surfaces. These findings provide more consideration for infection control and building environmental design.