共查询到20条相似文献,搜索用时 125 毫秒
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通过对堆垛机的作业过程的细致分析,建立了随机命令下堆垛机使用率数学模型,从而能判断出堆垛机是否能满足自动化立体仓库的吞吐要求。 相似文献
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Lotta Lind Miia Pirttilä Sari Viskari Florian Schupp Timo Kärri 《Journal of Purchasing & Supply Management》2012,18(2):92-100
Financial value chain analysis is used to examine working capital management by cycle times in the value chain of the automotive industry during 2006–2008. The applied method offers a holistic view of the value chain from raw materials to the end customers. The average cash conversion cycle of the value chain of the automotive industry was 67 days. According to the study, the change of cycle times of working capital followed mainly the change of cycle time of inventories. The position of the stages of the value chain measured by the cash conversion cycle did not change substantially from 2006 to 2008. 相似文献
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新立煤矿44006工作面回采二水平左三片91层,走向长度700米,平均倾斜长度230米,煤层平均厚度为0.7米,顶板为砂页岩,深灰色,以粘土质为主,层理不明显;底板为中砂岩,灰白色,以石英长石为主,胶结好,分选差,该工作面周期来压不明显。 相似文献
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董效林 《世界标准化与质量管理》2011,(9):56-59
企业能否实现长周期安全生产,与企业构建的安全生产保证体系密切相关。构建安全生产保证体系的内涵中,注重刚性管理的同时,要更加注重柔性管理。文章对企业建立的安全生产保证体系进行了简单分类,指出不同类型的安全生产保证体系存在发生不同类型风险的可能。通过实证案例,对构建符合实际的安全生产保证体系,实现长周期安全生产进行了介绍。 相似文献
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主要探讨了物流配送中心和其所服务连锁店在配送时间上的相互制约关系,以及配送中心在一个工作周期中的经营成本。在规定时间范围内保证满足连锁店服务要求的前提下,配送中心本着成本最小的原则,利用混合整数规划方法,对物流配送中心的选址进行优化。 相似文献
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This paper studies the cost of business cycles within a real business cycle model with search and matching frictions in the labor market. We endogenously link both the cyclical fluctuations and the mean level of unemployment to the aggregate business cycle risk. The key result of the paper is that business cycles are costly: fluctuations over the cycle induce a higher average unemployment rate since employment is nonlinear in the job-finding rate and the past unemployment rate. We show this analytically for a special case of the model. We then calibrate the model to U.S. data. For the calibrated model, too, business cycles cause higher average unemployment; the welfare cost of business cycles can easily be an order of magnitude larger than Lucas's (1987) estimate. The cost of business cycles is the higher the lower the value of nonemployment is, or, equivalently, the lower is the disutility of work. The ensuing cost of business cycles rises further when workers' skills depreciate during unemployment. 相似文献
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The job search literature suggests that on‐the‐job search reduces the probability of un employed people finding jobs. However, there is little evidence that employed and unemployed job seekers are similar or apply for the same jobs. We compare employed and unemployed job seekers in their individual characteristics, preferences over working hours, job‐search strategies and employment histories, and identify how differences vary over the business cycle. We find systematic differences which persist over the business cycle. Our results are consistent with a segmented labour market in which employed and unemployed job seekers are unlikely to directly compete with each other for jobs. 相似文献
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本文结合笔者的工作实践,从项目评价的角度出发,以项目生命周期为轴线,将项目评价划分为项目前评价、项目中评价和项目后评价。提出了项目监测评估从阶段上来说是属于项目中评价的范畴,并主要针对项目监测评估的概念和内容进行了详细探讨。 相似文献
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This paper empirically supports the hypothesis that a sinusoidal model can be used successfully to decompose time-series data into its components. Since the length of the seasonal cycle is known, this study documents how one makes use of this known length to infer characteristics of the more general non-seasonal cycle. By examining the ratios of the lengths of the longer to the shorter sine waves in the resulting fit of a sinusoidal model, one is able to determine which sine waves are estimating the same cycle and what the average length of that cycle is. A non-linear trend is estimated by adding a sine wave to the linear trend. 相似文献