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我国公共图书馆效率动态变化——基于省际面板数据的Malmquist指数分析 被引量:13
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作者 袁海 周哓唯 《图书馆建设》 CSSCI 北大核心 2011年第8期77-81,共5页
基于2000—2008年的省际面板数据,采用Malmquist生产率指数方法对我国公共图书馆的效率变化进行分析发现:公共图书馆整体效率不高,呈现东高西低的空间分布格局;从效率变化看,2000—2002年是公共图书馆效率改进期,主要是由技术进步引发的... 基于2000—2008年的省际面板数据,采用Malmquist生产率指数方法对我国公共图书馆的效率变化进行分析发现:公共图书馆整体效率不高,呈现东高西低的空间分布格局;从效率变化看,2000—2002年是公共图书馆效率改进期,主要是由技术进步引发的;2003年以后公共图书馆效率下降的主要原因是技术效率退步,而纯技术效率变动是技术效率下降的主要因素;从效率变化的地区特征看,仅东部地区公共图书馆存在效率改进,中西部地区公共图书馆的效率在下降。 展开更多
关键词 公共图书馆 效率动态变化 数据包络分析(DEA) MALMQUIST指数
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Self-Optimizing Flexible Assembly Systems
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作者 Robert Schmitt Peter Loosen +6 位作者 Christian Brecher Alberto Pavim Max Funck Valentin Morasch Alexander Gatej Nicolas Pyschny Sebastian Haag 《Computer Technology and Application》 2011年第5期333-343,共11页
Today's production systems are demanded to exhibit an increased flexibility and mutability in order to deal with dynamically changing conditions, objectives and an increasing number of product variants within industr... Today's production systems are demanded to exhibit an increased flexibility and mutability in order to deal with dynamically changing conditions, objectives and an increasing number of product variants within industrial turbulent environments. Flexible automated systems are requested in order to improve dynamic production efficiency, e.g. robot-based hardware and PC-based controllers, but these usually induce a significantly higher production complexity, whereby the efforts for planning and programming, but also setups and reconfiguration, expand. In this paper a definition and some concepts of self-optimizing assembly systems are presented to describe possible ways to reduce the planning efforts in complex production systems. The concept of self-optimization in assembly systems will be derived from a theoretical approach and will be transferred to a specific application scenario---the automated assembly of a miniaturized solid state laser--where the challenges of unpredictable influences from e.g. component tolerances can be overcome by the help of self-optimization. 展开更多
关键词 Flexible assembly systems SELF-OPTIMIZATION multi agent systems COGNITION tolerance matching sensor data fusion.
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