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31.
Shawn T. O’Neil Amitabh Chaudhary Danny Z. Chen Haitao Wang 《Journal of Combinatorial Optimization》2013,26(4):621-635
We present theoretical results for large-file distribution on general networks of known topology (known link bandwidths and router locations). We show that the problem of distributing a file in minimum time is NP-hard in this model, and we give an O(logn) approximation algorithm, where n is the number of workstations that require the file. We also characterize our method as optimal amongst the class of “no-link-sharing” algorithms. 相似文献
32.
Considering the effects of globalisation, the increase of production and energy costs, and the introduction of advanced technologies, companies need to change their way of doing business if they want to stay competitive. One way of doing this is to establish collaborations with suppliers, distributors and retailers, in order to exchange products efficiently and create value for customers. Nevertheless, the structure of the collaboration must be designed carefully and some coordination mechanisms must be implemented to support this way of doing business. In this article, we first analyse: why companies work together, how they should build their partnership, and which strategies they can implement to facilitate coordination of supply chain activities. We then report a case study of collaboration in the forest industry that shows the benefits of implementing coordination mechanisms as well as the necessity of using incentives to better share these benefits. 相似文献
33.
Martha Judith Chinouya Eileen O’Keefe 《International migration (Geneva, Switzerland)》2008,46(5):71-93
Migrants have been found to be at enhanced risk for the Human Immune Deficiency Virus (HIV) in comparison with settled populations. As they migrate, they often bring with them their traditions and cultural values, which may influence the ways they access or make sense of health promotion interventions in the host country. In the diaspora, should they experience compromised citizenship, marked by an unresolved immigration status, some may need to remain invisible and this may include not accessing or presenting late for vital health care interventions. Addressing the needs of such invisible populations is key to health promotion work and paramount to public health interests. This paper describes how ever‐changing “traditions”, in particular the notions of Pachedu and Zenzele, were harnessed to develop ethically grounded sexual health care interventions amongst Zimbabweans in Luton, Bedfordshire, England. These interventions were delivered in mundane settings that formed some of the key everyday networks of this population. The reinvention of “tradition” for the purposes of delivering health and social care interventions has been one of the cornerstones of health promotion interventions in Africa, where the rates of HIV are some of the highest in the world. The concept of Pachedu harnessed confidentiality in the delivery of sexual health interventions with Zenzele calling for communal involvement in such initiatives. A key point that resulted in the success of this intervention was partnership work between statutory providers and the local Zimbabwean population throughout the project’s life span. Rather than being construed as passive recipients of health and social care interventions, local Zimbabweans and their statutory partners were engaged in mutual capacity building initiatives. Local Zimbabweans were also engaged and consulted throughout, from the conceptualization of the project, delivery, monitoring, and dissemination of the findings. 相似文献
34.
Dynamic Measures of Individual Deprivation 总被引:1,自引:0,他引:1
We introduce a one-parameter class of individual deprivation measures. Motivated by a suggestion of Runciman, we modify Yitzhaki’s index by multiplying it by a function that is interpreted as measuring the part of deprivation generated by an agent’s observation that others in his reference group move on to a higher level of income than himself. The parameter reflects the relative weight given to these dynamic considerations, and the standard Yitzhaki index is obtained as a special case. In addition, we characterize more general classes of measures that pay attention to this important dynamic aspect of deprivation. 相似文献
35.
Emily Jane O’Dell 《Disability & Society》2015,30(7):1123-1126
The lack of attention in academic discourse to representations of disability in films from the Middle East has led to an incomplete picture of representations of disability in global cinema. For instance, the diverse meanings of disability in Iranian cinema and the influence of disability on the emergence of Iranian New Wave cinema have been almost completely ignored by scholars. A number of award-winning films from Iran have featured disability as central to their narratives – such as The House is Black (1963), Taste of Cherry (1997), The Color of Paradise (1999), The Willow Tree (2005), and The Painting Pool (2013). Disability in these films serves alternatively as a symbol of spiritual possibility, a mark of marginalization, and a covert social critique. These films examine the emotional, physical, and social implications of disability, while celebrating the cultural power of film to challenge social, religious, and artistic barriers. 相似文献
36.
Tom O’Neill 《Identities: Global Studies in Culture and Power》2015,22(1):124-139
This paper explores how second-generation Tamil-Canadian university students have modified their ‘cultural heritage’ in the period after the defeat of the Liberation Tigers of Tamil Eelam (LTTE) in May 2009. Using a generational framework suggested by the work of Karl Mannheim, I show that the events of May 2009 situated second-generation Tamil-Canadian political activism as a response to the ambivalence of their parents to the conflict in Sri Lanka. Second-generation Tamil-Canadians are also shown to have altered the key LTTE symbol of the Maaveerar (great hero) to better fit a transnational social field that is framed by the new realities of post-LTTE Sri Lanka and by intolerance to imported conflict in Canada. I argue that the Tamil second generation is highly engaged with the politics of their cultural identity, and that this engagement may have a lasting influence on transnational Tamil identity and on the political status of the Tamil community within Canada. 相似文献
37.
Preliminary Development and Validation of the Social and Emotional Health Survey for Secondary School Students 总被引:1,自引:0,他引:1
Michael J. Furlong Sukkyung You Tyler L. Renshaw Douglas C. Smith Meagan D. O’Malley 《Social indicators research》2014,117(3):1011-1032
This study reports on the preliminary development and validation of the Social and Emotional Health Survey (SEHS) with a sample of 4,189 (51 % female) California students in Grades 8, 10, and 12. The SEHS was designed to measure the psychological building blocks of adolescents’ positive mental health and is operationalized in the present study by a theoretical model comprised of 12 measured indicators that form four first-order domains (belief-in-self, belief-in-others, emotional competence, and engaged living) that, in turn, contribute to one underlying, second-order meta-construct called covitality. This study was the first to investigate the validity and utility of the adolescent covitality construct, which is conceptualized as the synergistic effect of positive mental health resulting from the interplay among multiple positive-psychological building blocks. Findings from confirmatory factor analyses, invariance analysis, and latent means testing all supported the theoretical model underlying the SEHS, indicating that the second-order covitality model was the best fit for both males and females. Results from a path-modeling analysis indicated that covitality was a strong predictor of students’ subjective well-being (operationalized as a composite of life satisfaction, positive affect, and negative affect), and findings from additional concurrent validity analyses indicated that adolescents’ covitality level was significantly associated with self-reported academic achievement, perceptions of school safety, substance use, and experiences of depressive symptoms. Implications for theory, practice, and future research are discussed. 相似文献
38.
Geraldine O’Sullivan 《Social indicators research》2011,101(1):155-172
The construct of eustress was studied alongside hope and self-efficacy, to explore how these constructs are related to life satisfaction among undergraduates. Questionnaires were administered to undergraduates to test the hypotheses that (1) as eustress levels increase, so will life satisfaction levels; (2) when eustress, hope, and self-efficacy are examined together, they will predict life satisfaction better than eustress alone; (3) eustress, hope, and self-efficacy will all be positively correlated with life satisfaction; and (4) self-efficacy will be the most positively correlated with life satisfaction. The results revealed a significant positive correlation between eustress and life satisfaction. A Hierarchical Linear Regression analysis revealed significant results supporting hypotheses 2 and 3, but not hypothesis 4. Results indicated that hope is the best predictor of life satisfaction. The work reported provides a reliable tool for measuring eustress, examines eustress in a new way at the academic level, and provides helpful information about student wellness to college administrators. 相似文献
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