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81.
82.
The objective of this study was determine if the inclusion of Canadian-style graphic images would improve the degree to which adolescents attend to, and subsequently are able to recall, novel warning messages in tobacco magazine advertising. Specifically, our goal was to determine if the inclusion of graphic images would (1) increase visual attention, as measured by eye movement patterns and fixation density, and (2) improve memory for tobacco advertisements among a group of 12 to 14 year olds in the western United States. Data were collected from 32 middle school students using a head-mounted eye-tracking device that recorded viewing time, scan path patterns, fixation locations, and dwell time. Participants viewed a series of 20 magazine advertisements that included five U.S. tobacco ads with traditional Surgeon General warning messages and five U.S. tobacco ads that had been modified to include non-traditional messages and Canadian-style graphic images. Following eye tracking, participants completed unaided- and aided-recall exercises. Overall, the participants spent equal amounts of time viewing the advertisements regardless of the type of warning message. However, the warning messages that included the graphic images generated higher levels of visual attention directed specifically toward the message, based on average dwell time and fixation frequency, and were more likely to be accurately recalled than the traditional warning messages.  相似文献   
83.
It is commonly required to detect change points in sequences of random variables. In the most difficult setting of this problem, change detection must be performed sequentially with new observations being constantly received over time. Further, the parameters of both the pre- and post- change distributions may be unknown. In Hawkins and Zamba (Technometrics 47(2):164–173, 2005), the sequential generalised likelihood ratio test was introduced for detecting changes in this context, under the assumption that the observations follow a Gaussian distribution. However, we show that the asymptotic approximation used in their test statistic leads to it being conservative even when a large numbers of observations is available. We propose an improved procedure which is more efficient, in the sense of detecting changes faster, in all situations. We also show that similar issues arise in other parametric change detection contexts, which we illustrate by introducing a novel monitoring procedure for sequences of Exponentially distributed random variable, which is an important topic in time-to-failure modelling.  相似文献   
84.
文化、自我建构与中国人的休闲   总被引:1,自引:0,他引:1       下载免费PDF全文
Markus和Kitayama提出了独立型自我建构与互依型自我建构概念:独立型自我个体崇尚彰显自我价值和与众不同,愿意把自己从环境和他人中脱离出来;而互依型自我建构个体重视人与人之间的关系,密切关注他人的需求与感受,愿意把自己融入环境和他人关系中。自我建构概念对理解中国人的休闲非常有益。第一,互依型自我建构特征影响着中国人的休闲认知,大部分中国人认为参加休闲活动可以增进家人感情和促进人际和谐,该认知进一步影响了休闲活动选择和休闲制约。第二,互依型自我建构特征还影响着中国人的休闲情绪。中国人喜欢温和情绪体验,与西方人相比更喜欢静态的休闲活动。第三,互依型自我建构特征也影响着中国人的休闲动机。西方学者认为休闲的核心特征是自由选择和自主性。但大量研究表明,它们最适于西方独立型自我建构个体,对处于东方文化中的互依型自我建构个体来说,人际关系和归属感比自由选择更重要。  相似文献   
85.
Adapted from the weed risk assessment (WRA) of Pheloung, Williams, and Halloy, the fish invasiveness scoring kit (FISK) was proposed as a screening tool for freshwater fishes. This article describes improvements to FISK, in particular the incorporation of confidence (certainty/uncertainty) ranking of the assessors' responses, and reports on the calibration of the score system, specifically: determination of most appropriate score thresholds for classifying nonnative species into low-, medium-, and high-risk categories, assessment of the patterns of assessors' confidences in their responses in the FISK assessments. Using receiver operating characteristic (ROC) curves, FISK was demonstrated to distinguish accurately (and with statistical confidence) between potentially invasive and noninvasive species of nonnative fishes, with the statistically appropriate threshold score for high-risk species scores being ≥19. Within the group of species classed as high risk using this new threshold, a "higher risk" category could be visually identified, at present consisting of two species (topmouth gudgeon Pseudorasbora parva and gibel carp Carassius gibelio ). FISK represents a useful and viable tool to aid decision- and policymakers in assessing and classifying freshwater fishes according to their potential invasiveness.  相似文献   
86.
What are the effects of public opinion on social welfare policies? To what extent is increased financial strain associated with stronger support for anti‐poverty policies? This article tests welfare state theory by comparing poverty, government policy and public opinion on poverty in the UK and Israel, based on rich and detailed comparable survey data on the conditions of the poor in both countries. The results show that, despite similar levels of income poverty and inequality, the poor have a considerably lower standard of living in Israel than the UK. There is considerably greater public support for the poor in Israel but limited government action to end poverty, whereas in the UK there is more limited public support for the poor but significant government action on poverty and exclusion. In both countries there appears to be only a limited connection between social solidarity with the poor and the political elite's rhetoric and action.  相似文献   
87.
Review of the concept of "the vanishing physician-scientist" shows: 1) medical school admissions reject most students wanting medical research careers; 2) college years before medical school are the best time for students to begin research; 3) efforts to entice admitted medical students and residents to do research are too little too late, yielding people not equipped to compete for grants with PhD track peers and less motivated because they have clinical careers to fall back on; 4) the MD/PhD could be replaced by the PhD/MD with uninterrupted research: a full PhD in parallel with part-time medical school followed by part-time residencies. Supplemental materials are available for this article. Go to the publisher's online edition of Accountability in Research to view the free supplemental file.  相似文献   
88.
Abstract

Increasing serials costs and shrinking budgets present challenges for academic libraries to continue providing sufficient access to scholarly articles. Rapid document delivery services can serve as an effective means to fill the gap caused by serials cancellations. This column examines several of the existing document delivery service providers and addresses issues involved in their implementation.  相似文献   
89.
In current Chinese health insurance programmes, there are two types of cost-sharing methods: the time-of-service copayment policy and the reimbursement policy. In contrast to the copayment participants, reimbursement participants need to pay for all medical expenses in advance. We study the effect of the reimbursement policy on the utilisation of healthcare services in China. The theoretical analysis indicates that the medical consumption of low income households will be less than the optimal consumption level when enrolled in a reimbursement programme instead of a copayment programme. Empirically, using data from the China Health and Retirement Longitudinal Study (CHARLS), we find that the total inpatient expenditure of the reimbursement participants is 12.7% lower than that of copayment enrolees, and the reimbursement arrangement negatively impacts low-income and rural populations. Therefore, reimbursement participants, those who are financially constrained, are more likely to suffer the up-front payment burden and finally reduce their healthcare needs.  相似文献   
90.
Extreme-value copulas arise in the asymptotic theory for componentwise maxima of independent random samples. An extreme-value copula is determined by its Pickands dependence function, which is a function on the unit simplex subject to certain shape constraints that arise from an integral transform of an underlying measure called spectral measure. Multivariate extensions are provided of certain rank-based nonparametric estimators of the Pickands dependence function. The shape constraint that the estimator should itself be a Pickands dependence function is enforced by replacing an initial estimator by its best least-squares approximation in the set of Pickands dependence functions having a discrete spectral measure supported on a sufficiently fine grid. Weak convergence of the standardized estimators is demonstrated and the finite-sample performance of the estimators is investigated by means of a simulation experiment.  相似文献   
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