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排序方式: 共有476条查询结果,搜索用时 31 毫秒
1.
Modelling daily multivariate pollutant data at multiple sites 总被引:7,自引:1,他引:6
Gavin Shaddick Jon Wakefield 《Journal of the Royal Statistical Society. Series C, Applied statistics》2002,51(3):351-372
Summary. This paper considers the spatiotemporal modelling of four pollutants measured daily at eight monitoring sites in London over a 4-year period. Such multiple-pollutant data sets measured over time at multiple sites within a region of interest are typical. Here, the modelling was carried out to provide the exposure for a study investigating the health effects of air pollution. Alternative objectives include the design problem of the positioning of a new monitoring site, or for regulatory purposes to determine whether environmental standards are being met. In general, analyses are hampered by missing data due, for example, to a particular pollutant not being measured at a site, a monitor being inactive by design (e.g. a 6-day monitoring schedule) or because of an unreliable or faulty monitor. Data of this type are modelled here within a dynamic linear modelling framework, in which the dependences across time, space and pollutants are exploited. Throughout the approach is Bayesian, with implementation via Markov chain Monte Carlo sampling. 相似文献
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Therapists working in Child and Adolescent Services commonly face the dilemma of if, how and when to address marital problems when the presenting problem is with a child. This article examines the different ways that some of the central family therapy models approach this issue. The Structural, Haley-Madanes Strategic and Milan Systemic models share the assumption that the child's symptoms are reflective of underlying family disturbance, with marital problems given a central place in the hypothesising. In contrast, the Solution Focused and Narrative approaches avoid assumptions about the deeper purpose of symptoms, focusing instead on the impact of the problem on family relationships, including the marriage. This emphasis ensures that parents do not receive either a direct or indirect message that their marriage is to blame. Consequently, a safe context is provided for addressing marital disturbance and for understanding its broader social base. Therapy is about noticing and expanding solution behaviours and competencies, rather than drawing out deeper pathologies. Case examples are used to illustrate the clinical applications of a Solution Focused-Narrative approach when children's problems emerge in conjunction with marital problems. 相似文献
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Dramatically reducing cycle times through flash development 总被引:1,自引:0,他引:1
Mark VandenboschAuthor VitaeTom CliftAuthor Vitae 《Long Range Planning》2002,35(6):567-589
The reduction of cycle time has emerged as a fundamental element of new product development strategy. Many companies look solely at speed enhancement and increase the human, capital and technical resources allocated to development projects. However, additional resources do not guarantee significant reductions in cycle time. As well as speed enhancement activities, there exist two other sets of activities that are key to shortening the development cycle: those that act to prevent delays (friction) in the development process and those that define the scope of the final outcome (direction). This paper describes flash development as an alternative approach to reducing product development cycle times. Flash development works by creating a process that focuses on speed, friction and direction. The process is illustrated through an analysis of the Galileo Project at Nortel Networks. 相似文献
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Managerial Involvement and Perceptions of Strategy Process 总被引:2,自引:0,他引:2
Nardine Collier Author VitaeAuthor Vitae Steven W. Floyd Author Vitae 《Long Range Planning》2004,37(1):67-83
Prior academic research attests to both positive and negative effects of involvement on the process of developing strategy. On the one hand, it has been argued that involvement strengthens shared vision, increases rationality and improves adaptiveness in strategy-making. On the other hand, involvement is said to lead to intense political behaviour, increased cultural inertia and more constraints in the strategy process. The purpose of this study is to investigate the relative importance of these effects. In a survey of over 6,000 managers, we find that their reported levels of involvement are positively associated with perceptions of strategy development processes that are more rational, more focused by a shared vision, and more adaptive. In addition, involvement is negatively associated with statements describing the process as top-down, influenced by politics and slowed by internal culture. Moreover, those who are more involved tend to see business and non-business constraints as less important in determining strategy. We argue that these associations between involvement and desirable features of strategy process are important because perceptions are the basis of managerial behaviour. Thus, managers who are more involved in strategy not only see the process in a more favourable light but also act in ways that make the process more effective. The main implication of these findings is that for most organisations increasing involvement improves the strategy process. 相似文献
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The Blinders of Dominant Logic 总被引:4,自引:0,他引:4
C.K. Prahalad Author Vitae 《Long Range Planning》2004,37(2):171-179
This article argues that the dominant logic embedded in an organisation may keep it on the road ahead, but it also acts as a blinder to peripheral vision. It says that managers need to look at beyond the borders of their industries and geographies to find new opportunities and rethink the logic of the business. It refers to corporate examples where shifts in organisations’ dominant logic allowed traditional assumptions about value creation to be reassessed and resulted in successful forays into the periphery. 相似文献
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Larry Huston Author Vitae 《Long Range Planning》2004,37(2):191-196
Revolutionary products often come from upstart players or companies outside the industry, while mainstream operators follow a risk-averse path of concentrating on their current business. This article urges companies to channel resources into looking at the periphery for ideas that could be profit-drivers of the future. It suggests three strategies for finding new products: frame the landscape; develop game-changing hypotheses; and use targeted hunting. It concludes by saying that these approaches will encourage managers to combine broad searching and thinking with focused evaluation and execution. 相似文献