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St De Lore J Thiede H Cheadle A Goldbaum G Carey JW Hutcheson RE Jenkins RA Golden MR 《Journal of homosexuality》2012,59(4):592-609
To assess HIV disclosure discussions and related sexual behaviors among men who have sex with men (MSM) who meet sex partners online, 28 qualitative interviews with Seattle-area MSM were analyzed using grounded theory methods and themes and behavior patterns were identified. MSM found a greater ease in communicating and could prescreen partners through the Internet. However, no consistent relationship was found between HIV disclosure and subsequent behaviors: some were safer based on disclosure while perceived HIV status led others to risky behaviors. Interventions need to promote accurate disclosure while acknowledging its limitations and the need for men to self-protect. 相似文献
884.
How a Navigation Channel Contributed to Most of the Flooding of New Orleans During Hurricane Katrina
Ivor Ll. van Heerden G. Paul Kemp Robert Bea Gary Shaffer John Day Chad Morris Duncan Fitzgerald Andrew Milanes 《Public Organization Review》2009,9(4):291-308
Levee failures during Hurricane Katrina left 85% of New Orleans flooded, 1,500 dead, and about 400,000 homeless. Three separate
investigations into the levee failures have been concluded, yet none of these studies conclusively determined why the St Bernard
polder flooded so deeply, despite Team Louisiana’s conclusion regarding early failure of the Mississippi River Gulf Outlet
(MRGO) levees. Detailed wave and hydrodynamic modeling reported here reveals the cause of extensive breaching of the MRGO
levees and how that created a very efficient conduit of surge water into the heart of the city. 相似文献
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Assessment of non-inferiority is often performed using a one-sided statistical test through an analogous one-sided confidence limit. When the focus of attention is the difference in success rates between test and active control proportions, the lower confidence limit is computed, and many methods exist in the literature to address this objective. This paper considers methods which have been shown to be popular in the literature and have surfaced in this research as having good performance with respect to controlling type I error at the specified level. Performance of these methods is assessed with respect to power and type I error through simulations. Sample size considerations are also included to aid in the planning stages of non-inferiority trials focusing on the difference in proportions. Results suggest that the appropriate method to use depends on the sample size allocation of subjects in the test and active control groups. 相似文献
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This paper examines supply chain design strategies for a specific type of perishable product—fresh produce—using melons and sweet corn as examples. Melons and other types of produce reach their peak value at the time of harvest; product value deteriorates exponentially post‐harvest until the product is cooled to dampen the deterioration. Using the product's marginal value of time (MVT), the rate at which the product loses value over time in the supply chain, we show that the appropriate model to minimize lost value in the supply chain is a hybrid of a responsive model from post‐harvest to cooling, followed by an efficient model in the remainder of the chain. We also show that these two segments of the supply chain are only loosely linked, implying that little coordination is required across the chain to achieve value maximization. The models we develop also provide insights into the use of a product's MVT to develop supply chain strategies for other perishable products. 相似文献
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We assume that students observe only a private, noisy signal of their ability and that universities can condition admission decisions on the results of noisy tests. If the university observes a private signal of each student's ability, which is soft information, then asymmetries of information are two‐sided, and the optimal admission policy involves a mix of pricing and pre‐entry selection, based on the university's private information. In contrast, if all test results are public knowledge, then there is no sorting on the basis of test scores: Tuition alone does the job of implementing an optimal degree of student self‐selection. These results do not depend on the existence of peer effects. The optimal tuition follows a classic marginal social‐cost pricing rule. (JEL: D82, H42, I22, J24) 相似文献