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Harvey Molotch Noah McClain 《International journal of urban and regional research》2003,27(3):679-698
The events of September 11th bring urgency to problems of urban security, both in terms of finding ways to protect cities from attacks by terrorists and also protecting urban life from repressive measures that form in reaction to those attacks. We outline a rationale for urbanists to participate in analysis and policy‐formulation on security issues and examine the utility of past urban research strategies, including criminology, in terms of their relevance to the current challenge. We suggest principles to guide future urban policy in light of past experiences. Les événements du 11 septembre rendent urgents les problèmes de sécurité urbaine, à la fois pour trouver des façons de protéger les villes contre des attaques terroristes et pour préserver la vie urbaine de mesures répressives en réponse à ces attaques. L'article argumente en faveur de la participation d'urbanistes à l'analyse et à la formulation d'une politique publique sur les questions de sécurité. Il examine le parti à tirer des stratégies de recherches urbaines antérieures (y compris en criminologie) en fonction de leur pertinence par rapport au défi actuel. De plus, il suggère des principes permettant d'orienter la politique urbaine future à la lumière des expériences passées. 相似文献
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Daniel Yekutieli Anat Reiner-Benaim Yoav Benjamini Gregory I. Elmer Neri Kafkafi Noah E. Letwin Norman H. Lee 《Statistica Neerlandica》2006,60(4):414-437
The multiplicity problem is evident in the simplest form of statistical analysis of gene expression data – the identification of differentially expressed genes. In more complex analysis, the problem is compounded by the multiplicity of hypotheses per gene. Thus, in some cases, it may be necessary to consider testing millions of hypotheses. We present three general approaches for addressing multiplicity in large research problems. (a) Use the scalability of false discovery rate (FDR) controlling procedures; (b) apply FDR-controlling procedures to a selected subset of hypotheses; (c) apply hierarchical FDR-controlling procedures. We also offer a general framework for ensuring reproducible results in complex research, where a researcher faces more than just one large research problem. We demonstrate these approaches by analyzing the results of a complex experiment involving the study of gene expression levels in different brain regions across multiple mouse strains. 相似文献
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Noah Williams 《Journal of Economic Theory》2004,119(2):271-298
We develop analytic asymptotic methods to characterize time-series properties of nonlinear dynamic stochastic models. We focus on a stochastic growth model which is representative of the models underlying much of modern macroeconomics. Taking limits as the stochastic shocks become small, we derive a functional central limit theorem, a large deviation principle, and a moderate deviation principle. These allow us to calculate analytically the asymptotic distribution of the capital stock, and to obtain bounds on the probability that the log of the capital stock will differ from its deterministic steady-state level by a given amount. This latter result can be applied to characterize the probability and frequency of large business cycles. We then illustrate our theoretical results through some simulations. We find that our results do a good job of characterizing the model economy, both in terms of its average behavior and its occasional large cyclical fluctuations. 相似文献
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As a financial executive, are you a Business answer will determine how successful you will be in tomorrow's digital economy. © 2000 John Wiley & Sons, Inc. 相似文献
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Noah Shepherd 《旅游业当前问题》2013,16(3-4):309-318
In 1989, two ecotourism operators started business in South Thailand – SeaCanoe, running kayaking trips in Phang Nga Bay, and Siam Safari, running nature tours in Phuket and South Thailand. Both companies have received international awards and recognition for their work in promoting environmentally sensitive tours yet their efforts seem to have been thwarted by the growth in mass tourism within South Thailand. Throughout the 1990s, Phuket received a three-fold increase in arrivals, and with it the establishment of many imitators of the original pioneers. This paper looks at the relationship between mass tourism and ecotourism and questions whether the two are compatible or mutually exclusive. 相似文献
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We study the properties of the generalized stochastic gradient (GSG) learning in forward‐looking models. GSG algorithms are a natural and convenient way to model learning when agents allow for parameter drift or robustness to parameter uncertainty in their beliefs. The conditions for convergence of GSG learning to a rational expectations equilibrium are distinct from but related to the well‐known stability conditions for least squares learning. 相似文献
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We show information spillovers limit the effectiveness of targeted debt relief programs. We study individuals who learn about the likelihood of debt relief from the recent experiences of workplace peers filing for bankruptcy protection. Peers granted bankruptcy can discharge debts, while peers facing dismissal lose all protections. Exploiting the random assignment of judges to bankruptcy cases, we determine that individuals with a “dismissed peer” are significantly less likely to file for bankruptcy or enter foreclosure. We highlight a novel channel relating social networks to household finances and identify additional costs of granting individual debt relief imposed on lenders. 相似文献