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In assembly plants, random line stoppages cause production variability. For analytic tractability and data availability, researchers commonly assume that the production process possesses the independent increments property (necessary for a process to be Poisson). If the production process has independent increments, then the production in any interval is independent of the production in any other nonoverlapping interval. This property means, for one thing, that the current period's production is never influenced by previous production periods. Intuition, however, suggests that current production could be correlated to past production-violating this assumption of independence. If production problems persist from one period to the next, then one would expect the production in adjacent time periods to be correlated. Although the independent increments property is oflen assumed, its validity has not been demonstrated in practice. We analyze data from an automotive assembly plant to assess the validity of the independent increments assumption for its production. 相似文献
84.
ROBERT F. BENSON SEAN P. CUNNINGHAM ROBERT C. LEACHMAN 《Production and Operations Management》1995,4(3):201-216
A methodology for benchmarking manufacturing practices in the worldwide semiconductor industry is presented. Several metrics for measuring semiconductor manufacturing performance are defined and discussed. Interviews conducted during site visits are used to identify the managerial, technical, and organizational practices underlying superior metric performance. Multivariate statistical analyses of the performance metric data indicate that these performance metrics measure independent aspects of performance and expose significant performance differences among fabs. 相似文献
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Operational-level scheduling decisions on the factory floor include the release policy and the dispatching rule. Recent work by researchers suggests that factory performance depends heavily on the release policy. Several heuristic factory release rules have been developed that generate release decisions based on the status of the bottleneck machine. The heuristic rules perform very well in reducing the work-in-process inventory. However, factory output schedules generated by these rules generally fail to match the demand pattern, creating excessive finished goods inventory and/or excessive backorders. To overcome these difficulties, a computationally efficient integer programming model is proposed for release scheduling. 相似文献
86.
Firms capable of reducing the time required to bring new products to the marketplace realize significant competitive gains. In this context, the existing literature on capacity expansion is limited because it does not consider the lead time required to construct and operationalize new capacity. Models are introduced here that capture the capacity expansion lead time as well as two types of learning. Specifically, learning may reduce the lead time or cost required to complete an expansion. Analytic and numerical results show that the optimal solution can be significantly affected by the explicit treatment of the lead time and learning. 相似文献
87.
Abstract. We develop a variance reduction method for smoothing splines. For a given point of estimation, we define a variance-reduced spline estimate as a linear combination of classical spline estimates at three nearby points. We first develop a variance reduction method for spline estimators in univariate regression models. We then develop an analogous variance reduction method for spline estimators in clustered/longitudinal models. Simulation studies are performed which demonstrate the efficacy of our variance reduction methods in finite sample settings. Finally, a real data analysis with the motorcycle data set is performed. Here we consider variance estimation and generate 95% pointwise confidence intervals for the unknown regression function. 相似文献
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Digital technologies have enabled the geographical expansion of production and the distribution of creative goods and communication. Simultaneously, the number of trade fairs and congresses has increased. This rise of temporary encounters has led to theorizations of events as marketplaces, learning sites and field‐configuring practices. This article elaborates on the metaphor of rewiring to propose and empirically demonstrate a further role of industry events for global business. Drawing on the case of the global stock photo trade, we use a unique survey to map the global network of sales partnerships as well as interviews conducted at international lead congresses to demonstrate how these events are enacted as social relays. Our findings demonstrate how temporary face‐to‐face contact facilitates long distance relationships between organizations and how it dynamically shapes the global industry network. Thus, we contribute to closing the gap between social action at the micro level, organizational linkages at the meso level and the structure of global industry networks at the macro level. 相似文献
89.
ROBERT A. CAMPBELL 《Revue canadienne de sociologie》2005,42(3):249-265
Deux enquêtes ont été effectuées auprès d'étudiants de deux universitiés canadiennes sur leurs perceptions des relations entre la religion, la science et le sens de la vie. Les données démontrent que, tandis que les étudiants pensent régulièrement à la signification de la vie, leurs opinions sur la religion par rapport à la science ne laissent voir que de bas niveaux de corrélation. Les étudiants ont indiqué que leur plus grande préoccupation par rapport au sens de la vie était due à leur famille et à leurs amis. Dans l'ensemble, les données suggèrent que les étudiants considèrent la religion et la science comme des entités indépendantes, mais seulement en ce qui concerne la part qu'elles occupent dans la vie des individus et dans les affaires mondiales.
Students at two distinctly different Canadian universities were surveyed about their perceptions of the relationship between religion, science, and thinking about the meaning of life. The data show that while students regularly think about the latter, their views on religion and science show only low levels of correlation with each other. Students indicated that their greatest insights into the meaning of life came from family and friends. Overall, the data suggest that students view religion and science as independent entities, both with respect to the part that these play in the life of individuals and in world affairs. 相似文献
Students at two distinctly different Canadian universities were surveyed about their perceptions of the relationship between religion, science, and thinking about the meaning of life. The data show that while students regularly think about the latter, their views on religion and science show only low levels of correlation with each other. Students indicated that their greatest insights into the meaning of life came from family and friends. Overall, the data suggest that students view religion and science as independent entities, both with respect to the part that these play in the life of individuals and in world affairs. 相似文献
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