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51.
Mike Jacroux 《Journal of statistical planning and inference》1984,9(2):259-267
In this paper we consider proper block designs and derive an upper bound for the number of blocks which can have a fixed number of symbols common with a given block of the design. To arrive at the desired bound, a generalization of an integer programming theorem due to Bush (1976) is first obtained. The integer programming theorem is then used to derive the main result of this paper. The bound given here is then compared with a similar bound obtained by Kageyama and Tsuji (1977). 相似文献
52.
The aim of this study was to examine the interaction between aging and 10 years of racing in endurance runners. Race-time data from 194 runners who had completed 10 consecutive 56-km ultramarathons were obtained. The runners were either 20.5 +/- 0.7, 30.0 +/- 1.0, 39.9 +/- 0.9, or 49.4 +/- 1.0 years old at their first race. Each runner's race speed was determined for each race over the 10 years. Data were analyzed using repeated-measures ANOVA, one-way ANOVA, and independent t tests and showed that performance improved and declined at greater rates for younger runners; younger runners had a greater capacity for improvement than older runners; approximately 4 years were required to reach peak racing speed, regardless of age; it was not possible to compete at peak speed for more than a few years; and the combined effects of 10 years of aging and racing neither improve nor worsen net performance. In conclusion, these data suggest that although these runners showed similar patterns of change in race speed over a 10-year period, the extent of change in performance was greater in younger than in older runners. 相似文献
53.
An empirical study was undertaken in San Diego, California, to test assumptions made by the government and by conservative religious policy advocates that there is a greater incidence of crime in the vicinity of peep show establishments. We asked two questions: (a) Is criminal activity in San Diego particularly acute at peep show establishments compared to surrounding control locations? and (b) Is criminal activity in San Diego disproportionately greater at or near peep show establishments between the hours of 2 a.m. and 6 a.m. compared to other times of the day? The levels of crime activity and the expenditure of police resources were examined by measuring the number of calls-for-service (CFSs) to the police within a 1,000-ft. area on either side of the peep show establishments and comparably-sized control areas beyond the immediate 1,000-foot area. A more focused late-night (2 a.m. to 6 a.m.) analysis was also undertaken. The results showed no reliable evidence of differences in crime levels between the control and test areas, nor was there any evidence of disproportionately greater amounts of crime within the 2 a.m. to 6 a.m. time period in the areas surrounding the peep show establishments. We concluded that San Diego does not have a problem with crime at the peep show establishments generally, nor is there a heightened problem with crime during the 2 a.m. to 6 a.m. period. We discuss the implications of assuming that peep show establishments are associated with negative effects in the community and the possibility of viewpoint discrimination against sex communication. 相似文献
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Jeremy Staff Alyssa M. Yetter Kelsey Cundiff Nayan Ramirez Mike Vuolo Jeylan T. Mortimer 《Journal of research on adolescence》2020,30(2):406-422
Past cohorts of teenagers who spent long hours in jobs were more likely to drop out of high school than those who worked moderate hours or did not work at all. This article examines the association between employment intensity and dropout among adolescents in the High School Longitudinal Study of 2009 who traversed high school during a time of decreased prevalence of both employment and dropout relative to earlier cohorts. Analyses reveal that a relatively small percentage of teenagers nowadays are characterized as either intensive workers or dropouts (around 11% each). Yet, despite declines in intensive employment and dropout, disadvantaged youth remain overrepresented in both groups, and intensive work is still a risk factor for poor grades and dropout. 相似文献
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This is the Introduction to the special issue entitled "The Olympic Games in Japan and East Asia: Images and Legacies.” 相似文献
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Mike W. Martin 《Journal for the theory of social behaviour》1999,29(2):109-131
It is now commonplace to call persons sick when their wrongdoing becomes entrenched, extensive, and extreme. This mixing of moral and therapeutic categories seems incoherent if we uncritically embrace a morality-therapy dichotomy: Behavioral problems like alcoholism are either moral or therapeutic matters, but not both. This paper dissolves the dichotomy by arguing that chronically abusive drinking is simultaneously a sickness and wrongdoing. Alcoholism is at least partly a self-inflicted impairment of responsible agency that has unhealthy consequences and usually requires therapeutic interventions. Morality and therapy are not inherently opposed. Morality enjoins compassionate helping and nonjudgemental therapy, and therapy is rooted in moral values of caring and respect. The polarized positions of Herbert Fingarette in Heavy Drinking and George E. Vaillant in The Natural History of Alcoholism are reconciled by paying close attention to their accounts of the condition, causes, consequences, and cure of alcoholism. 相似文献
60.
Mike Clear 《The Australian journal of social issues》1999,34(2):119-136
The study on which this paper was based explored parent/ professional relationships where disabled children were involved, and the underlying cultures which influence them. The paper seeks in part to relocate debate about parent/professional relations away from a mere instrumental view to the wider context of advancing understanding of social capital. Interestingly the study highlights some examples of relations consistent with a poststructuralist framework of power which unfolded within broadly patriarchal and capitalist structures more relevant to feminist critiques of human caring and ‘caring’ systems. Overall it shows the unequal structure of power arrangements in parent/professional relations, and indicates the possible benefits for caring and support systems of an approach which is less technically driven and hierarchical and more ‘horizontal’, personal and reciprocally based. 相似文献