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Jake Clarkson Michael A. Voelkel Anna-Lena Sachs Ulrich W. Thonemann 《Production and Operations Management》2023,32(3):813-828
A retailer places orders periodically for items that are shipped by a wholesaler. Items that are not sold perish randomly and independently of one another, with the perish probability depending on the age class. We consider a first-in-first-out policy for depleting items. We model this problem as a Markov decision process with stochastic demand, unit holding, outdating and ordering costs, plus unit penalty costs for lost sales. We prove convexity for the penultimate period and show convexity may not hold any earlier. A dynamic program can be solved optimally for small instances. We introduce both a one-stage-lookahead heuristic and a heuristic which is a combination of two existing standard approaches, the newsvendor and periodic review models. For simulated data, we compare these heuristics to the optimal solution for small problem instances and to further lookahead policies for larger problem instances. We show that the two new heuristics achieve results close to optimal. Our numerical study, which includes real data from a large European retail chain, highlights that products perishing independently from each other strongly affect model behavior compared to existing approaches from the literature. 相似文献
13.
Shinwoo Choi Jioni A. Lewis Stacy Harwood Ruby Mendenhall Margaret Browne Huntt 《Journal of Ethnic & Cultural Diversity in Social Work》2017,26(1-2):18-29
ABSTRACTThis study explores the moderating role of ethnic identity in the relations between racial microaggressions and depressive symptoms. Using survey data from 353 Asian-American college students, we found that racial microaggressions significantly predicted depressive symptoms and accounted for 24% of the variance in a hierarchical multiple regression analysis. In addition, ethnic identity moderated the relations between racial microaggressions and depressive symptoms. Thus, ethnic identity buffers Asian-Americans against the negative mental health effects of racial microaggressions. Implications for research and practice in the field of social work are discussed. 相似文献
14.
Effect sizes are an important component of experimental design, data analysis, and interpretation of statistical results. In some situations, an effect size of clinical or practical importance may be unknown to the researcher. In other situations, the researcher may be interested in comparing observed effect sizes to known standards to quantify clinical importance. In these cases, the notion of relative effect sizes (small, medium, large) can be useful as benchmarks. Although there is generally an extensive literature on relative effect sizes for continuous data, little of this research has focused on relative effect sizes for measures of risk that are common in epidemiological or biomedical studies. The aim of this paper, therefore, is to extend existing relative effect sizes to the relative risk, odds ratio, hazard ratio, rate ratio, and Mantel–Haenszel odds ratio for related samples. In most scenarios with equal group allocation, effect sizes of 1.22, 1.86, and 3.00 can be taken as small, medium, and large, respectively. The odds ratio for a non rare event is a notable exception and modified relative effect sizes are 1.32, 2.38, and 4.70 in that situation. 相似文献
15.
Impacts of privatization: Use of multimodal survey 总被引：1，自引：0，他引：1
Given current local government fiscal stress, the privatization of public services has been considered as a way to balance local government budgets and improve community service efficiencies. However, along with economic efficiency, the social efficiency of the privatization should be considered. Social efficiency not only incorporates economic efficiency but also includes accountability and equity. In this study, the economic and social impact of the potential privatization of a local utility (Churchill County Communications) is estimated. A web-based questionnaire was employed to collect data quickly and efficiently from CC Communication's employees and employ the questionnaire results in the analysis. Using and augmented input–output model of Churchill County, the analysis showed that privatization would reduce Churchill County employment by 279 jobs and reduce county household income by $36.171 million. In addition, the county could lose up to 14,735 hr of volunteer time and $85,233 in charitable donations if CC Communications were privatized. 相似文献
16.
In May 2013 one of the most profoundly influential books of the late twentieth and early twenty‐first century was released in its fifth edition. Yet, it is not unreasonable to speculate that this newest edition will pass largely unnoticed, even as new diagnoses (and the loss of current ones) seep into the everyday. The fifth edition of the Diagnostic and Statistical Manual of Mental Disorders (DSM‐5) will undoubtedly be influential in education – defining and re‐defining student maladies. Its list of extensive categories provides, so it is argued, a means to uniformly identify mental disorders. Applied in educational contexts, children and young people can thus be categorized by clinical experts and teachers able to identify an individual's problems, and in theory, respond appropriately. Criticism of the DSM includes debate over its application in cross‐cultural contexts as well as the ways that socio‐economic differences are, to put it bluntly, diagnosed differently. Although these issues of diagnosis do get attention, historical contexts can remain bereft in commentary. In this paper we consider the value that historical perspectives can bring to an analysis of the contemporary effects of DSM‐inspired readings of education and disadvantage. The paper also draws on two projects, one with young people, the other with parents of young children, both of whom experienced disadvantage and precarious relationships with education. In these excluded contexts, people are more likely to come into contact with diagnostic repertoires that originate from the DSM. Drawing on Georges Canguilhem's analysis the ‘concept' as well as Michel Foucault's discussion of Canguilhem's work, this paper considers how attention to school problems is important for disengaging with education's appetite for psychiatric disorders. 相似文献
17.
Amanuel A. Abajobir Steve Kisely Gail Williams Lane Strathearn Jake M. Najman 《Journal of sex research》2018,55(1):106-119
Childhood maltreatment is associated with a range of adverse mental and physical health outcomes, including increased rates of sexually transmitted infections (STIs) later in life. However, the impact on risky sexual behaviors and pregnancy outcomes has not been adequately studied. This is particularly true for physical abuse, emotional abuse, and neglect. We examined associations between prospectively substantiated childhood maltreatment and reports of risky sexual behaviors by men and women, as well as selected pregnancy outcomes in women. We followed up 3,081 (45.7% female) participants from the Mater-University of Queensland Study of Pregnancy, a prospective Australian birth cohort study. Using logistic regression, we examined the association between substantiated childhood maltreatment from birth to 14 years, and self-reported risky sexual behaviors and youth pregnancy outcomes at the 21-year follow-up. In adjusted analyses, children who had experienced multiple childhood maltreatment exhibited more risky sexual behaviors than their nonmaltreated counterparts. In specific models, those exposed to each form of childhood maltreatment, independent of co-occurring forms of childhood maltreatment, had an increased likelihood of risky sexual behaviors, particularly an early sexual debut and, for women, youth pregnancy. Neglect was also associated with multiple sexual partners, and emotional abuse with higher rates of miscarriage. There was no difference between men and women in how different forms of childhood maltreatment predicted risky sexual behaviors in young adulthood. All forms of substantiated childhood maltreatment, including multiple substantiations, were associated with risky sexual behavior in both sexes as well as higher rates of youth pregnancy in women. Moreover, emotional abuse persistently predicted miscarriages in young adult women. Understanding the association between childhood maltreatment and risky sexual behaviors and youth pregnancy outcomes may help suggest preventive strategies. 相似文献
18.
This paper examines stereotypes of lesbians held by college students. Multiple stereotypes are elicited from a free response trait listing task, followed by a sorting task. The results of the sorting task are submitted to cluster analysis and multidimensional scaling to reveal the complexity of cognitive representations of this group. Eight types are described, reflecting underlying distinctions between positive perceptions (e.g., lipstick lesbian, career-oriented feminist) and negative perceptions (e.g., sexually deviant, angry butch) and also between relative strength and weakness. The research is discussed in terms of cognitive perspectives on stereotyping and gender inversion theory. Suggestions for future research are provided. 相似文献
19.
David Matsumoto Jeff LeRoux Carinda Wilson-Cohn Jake Raroque Kristie Kooken Paul Ekman Nathan Yrizarry Sherry Loewinger Hideko Uchida Albert Yee Lisa Amo Angeline Goh 《Journal of Nonverbal Behavior》2000,24(3):179-209
In this article, we report the development of a new test designed to measure individual differences in emotion recognition ability (ERA), five studies examining the reliability and validity of the scores produced using this test, and the first evidence for a correlation between ERA measured by a standardized test and personality. Utilizing Matsumoto and Ekman's (1988) Japanese and Caucasian Facial Expressions of Emotion (JACFEE) and Neutral Faces (JACNeuF), we call this measure the Japanese and Caucasian Brief Affect Recognition Test (JACBART). The JACBART improves on previous measures of ERA by (1) using expressions that have substantial validity and reliability data associated with them, (2) including posers of two visibly different races (3) balanced across seven universal emotions (4) with equal distribution of poser race and sex across emotions (5) in a format that eliminates afterimages associated with fast exposures. Scores derived using the JACBART are reliable, and three studies demonstrated a correlation between ERA and the personality constructs of Openness and Conscientiousness, while one study reports a correlation with Extraversion and Neuroticism. 相似文献
20.
Melissa Harwood 《Serials Review》2013,39(1):31-35
AbstractIt will soon be rare for research-based institutions not to have a digital repository. The main reason for a repository is to maximize the visibility of the institution’s research outputs (provide Open Access), yet few contain a representative proportion of the research produced by their institutions. Repositories form one part of the institution’s Web platform. An explicit, mandatory policy on the use of the repository for collecting outputs is needed in every institution so that the full research record is collected. Once full, a repository is a tool that enables senior management in research institutions to collate and assess research, to market their institution, to facilitate new forms of scholarship, and to enable the tools that will produce new knowledge. 相似文献