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排序方式: 共有468条查询结果,搜索用时 218 毫秒
461.
Roser Granero Fernando Fernández-Aranda Neus Aymamí Mónica Gómez-Peña Ana Beatriz Fagundo Sarah Sauchelli Amparo del Pino-Gutiérrez Laura Moragas Lamprini G. Savvidou Mohammed A. Islam Salomé Tàrrega José M. Menchón Susana Jiménez-Murcia 《Journal of gambling studies / co-sponsored by the National Council on Problem Gambling and Institute for the Study of Gambling and Commercial Gaming》2015,31(4):1161-1178
462.
Michael N. Katehakis Benjamin Melamed Jim Shi 《Production and Operations Management》2016,25(9):1558-1575
Small‐to‐medium‐sized enterprises (SMEs), including many startup firms, need to manage interrelated flows of cash and inventories of goods. In this study, we model a firm that can finance its inventory (ordered or manufactured) with loans in order to meet random demand which in general may not be time stationary. The firm earns interest on its cash on hand and pays interest on its debt. The objective is to maximize the expected value of the firm's capital at the end of a finite planning horizon. The firm's state at the beginning of each period is characterized by the inventory level and the capital level measured in units of the product, whose sum represents the “net worth” of the firm. Our study shows that the optimal ordering policy is characterized by a pair of threshold parameters as follows. (i) If the net worth is less than the lower threshold, then the firm employs a base stock order up to the lower threshold. (ii) If the net worth is between the two thresholds, then the firm orders exactly as many units as it can afford, without borrowing. (iii) If the net worth is above the upper threshold, then the firm employs a base stock order up to the upper threshold. Further, upper and lower bounds for the threshold values are developed using two simple‐to‐compute myopic ordering policies which yield lower bounds for the value function. We also derive an upper bound for the value function by considering a sell‐back policy. Subsequently, it is shown that policies of similar structure are optimal when the loan and deposit interest rates are piecewise linear functions, when there is a maximal loan limit and when unsatisfied demand is backordered. Finally, further managerial insights are provided with extensive numerical studies. 相似文献
463.
Cheng Xia-Lan Nizamani Mir Muhammad Jim Chi-Yung Qureshi Salman Liu Shuang Zhu Zhi-Xin Wu Si-Si Balfour Kelly Wang Hua-Feng 《Urban Ecosystems》2022,25(2):511-522
Urban Ecosystems - Urban trees perform various ecosystem services, and tree DBH (trunk diameter at breast height, 1.3 m above the ground) can act as a surrogate measure of these important... 相似文献
464.
We characterize the maximal sets of preferences under which generalized median voter schemes are strategy-proof. Those domains
are defined by a qualified version of single-peakedness, which depends on the distribution of power among agents implied by
each generalized median voter scheme.
Received: 28 April 1997/Accepted: 30 January 1998 相似文献
465.
Bright J Aylott M Bate S Geys H Jarvis P Saul J Vonk R 《Pharmaceutical statistics》2011,10(6):485-493
In 2010, the Statisticians in the Pharmaceutical Industry (PSI) Toxicology Special Interest Group met to discuss the design and analysis of the Comet assay. The Comet assay is one potential component of the package of safety studies required by regulatory bodies. As these studies usually involve a three-way nested experimental design and as the distribution of the measured response is usually either lognormal or lognormal plus a point mass at zero, the analysis is not straightforward. This has led to many different types of analysis being proposed in the literature, with several different methods applied within the pharmaceutical industry itself. This article summarises the PSI Toxicology Group's discussions and recommendations around these issues. 相似文献
466.
Francisco Valenzuela Matías Sanfuentes Alejandro Castillo 《Gender, Work and Organization》2023,30(1):177-196
In this paper, we explore the theoretical and empirical links between gender and resilience within the context of crisis management by developing a theoretically oriented analysis of the iconic case of the 33 Chilean miners rescue. Analytic focus is placed on the capacity of resilience-promoting actors to embody and transform the discursive and practical dimensions of gendered regimes that predominate at an organizational level. As a result, we can distinguish four distinct modalities—normative redefinition, emotional reaccommodation, resistance, and affective affirmation—through which the gendered dimension of resilience becomes undone and redone, based on the action of alternative rationalities and affects. Overall, our findings indicate that resilience cannot be made possible without effectively disputing the norms that dispose how bodies, in all their diversity, are able to be recognized and socially experienced to face and manage crises effectively. 相似文献
467.
With an increased focus on social well-being in response to a burgeoning global economy exposing the weaknesses of social welfare policies, research output in the field has grown exponentially. Keeping track of the evolving research themes proves difficult due to the steady rise in the number of studies published in the interdisciplinary field of social welfare. Therefore, researchers need a comprehensive overview to confirm the current shape of the field based on the published research. Using a latent Dirichlet allocation algorithm as a topic modelling technique, this study identified 12 prominent themes from more than 10,000 research outputs on social welfare published from 2000 to 2020 in Scopus-indexed journals. Such an exploratory text-mining approach to literature review provides broad insights into the diversity of research and may serve as a foundation for further in-depth studies. Identifying these 12 thematic areas and their sub-themes allows us to articulate the complexity and diversity of social welfare issues, which go far beyond the field of well-established welfare economics or social work. The study shows that the topic of ‘social welfare’ has not only evolved over time but has significantly broadened its meaning. It can no longer be solely synonymous with institutional social security. We contend that research in this area needs to take into account a broader and more systematic range of determinants constituting the dynamic character of social welfare. 相似文献
468.