Performance Analysis of Exponential Multi-Server Production Lines with Fluid Flow and Finite Buffers

This article presents an approximation method for fluid flow production lines with multi-server workstations and finite buffers. Each workstation consists of parallel identical servers, which are subject to operation-dependent failures with exponentially distributed uptimes and downtimes. The proposed method decomposes the production line into single-buffer subsystems, each described by a continuous state Markov process, the parameters of which are determined iteratively. The approximation method is appropriate for the analysis of longer production lines, able to accurately estimate performance characteristics (e.g., throughput and mean buffer content), and shown to perform well on a large test set.     

Approximate entropy: Statistical properties and applications

ApEn, approximate entropy, is a recently developed family of parameters and statistics quantifying regularity (complexity) in data, providing an information-theoretic quantity for continuous-state processes. We provide the motivation for ApEn development, and indicate the superiority of ApEn to the K-S entropy for statistical application, and for discrimination of both correlated stochastic and noisy deterministic processes. We study the variation of ApEn with input parameter choices, reemphasizing that ApEn is a relative measure of regularity. We study the bias in the ApEn statistic, and present evidence for asymptotic normality in the ApEn distributions, assuming weak dependence. We provide a new test for the hypothesis that an underlying time-series is generated by i.i.d. variables, which does not require distribution specification. We introduce randomized ApEn, which derives an empirical significance probability that two processes differ, based on one data set from each process.     

文化意识的二重性与价值观念的传承、建构

文化的重要特征是传承。而传承又主要是观念和信息意义上的。直接现实性的物质文化形态只有转化为间接的符号存在形式,才能以文化基因的方式不断复制自身并世代延续下去。以符号为载体的制度文化、观念文化表现为行为的模式和思想观念上认知和价值评价的二重反映形式,它们的传承具有不同特点。其中价值观念又构成了知行的中介环节。     

地方政府融资平台现状及发展策略——基于四川省某融资平台公司调查分析

针对目前传统的机车信号测试环线安装在钢轨内侧腰部存在一定的磁屏蔽、安装相对不是很容易、施工钢轨穿孔困难等缺点,结合具体施工等实际因素,设计并实现了一种成本较为低廉、安装方便、削弱构成磁屏蔽的一种机车信号测试环线支架法。该方法采用自主设计,特定加工的环线支架固定在钢轨上,环线通过支架安装在钢轨外侧,高度基本与钢轨高度水平。实践证明,这种环线支架法较之前传统的安装方式使用效果良好、信号检测稳定,设计经过实践检验基本合理,能满足机车信号的正常检测,在一定程度上优化了设计,方便了施工,达到了预期目标。     

经济信号失真--中国经济改革速度缓慢的原因之四

目前,中国人的经济行为基本上是我行我素,在缺少恪守伦理原则的情况下,政府、企业、个人所发送的经济信号显示失真的现象司空见惯,导致转轨时期中国经济改革的速度缓慢.文章从经济信号失真的内涵出发,结合中国经济现实,列举出信号失真的表现,并尽力寻找产生的原因,最终阐述其解决办法.     

"女性范例":"消费社会"意识形态的女性规训——布希亚思想的女权主义探微

在布西亚的消费社会思想内蕴涵的女权主义思想,是通过"女性范例"得到表述的。作为消费社会的规训手段,女性范例的意识形态性在女性关于自身的认识与消费中表现出来。总体说来布西亚的女权主义思想是一种后现代女权主义思想。     

植物激素对植物盐胁迫的调控

在逆境条件下,植物激素对植物生长发育有重要的调控作用.本文主要就近年来植物激素对植物盐胁迫的调控及盐胁迫下激素分子的信号转导所取得的研究进展作一简要概述.     

小波分析在测井裂缝识别中的应用

针对井下裂缝发育层段识别的难点,提出了用小波分析的方法分解声波时差信号,使井下的岩性与微观结构特征信号、流体性质信号、裂缝响应信号和随机干扰信号互相分离,直接重构出反映裂缝发育的声波高频信号,从而避免许多声波低频信号的影响,正确识别裂缝发育情况。用同样的方法分解双侧向电阻率信号,重构出电阻率测井各个层段的低频信号,直观地反映深、浅侧向的差异情况,有效地识别裂缝发育层位。最后结合高频声波信号和低频电阻率信号,识别出裂缝发育层段。应用表明,该方法与岩芯观察有很好的一致性。     

风险偏好信息非对称下的供应链寄存契约研究

分析了寄存契约下,供应商损失规避程度对供应商生产量及供应链中成员利润的影响,进一步考虑损失规避信息为对称和非对称情况下,损失规避程度对供应链中成员利润的影响,以及对零售商而言风险态度信息的价值。研究发现,供应链中成员利润为损失规避程度的减函数,信息对称情况下供应链中成员利润要优于非对称信息情况下。最后,基于信号博弈探讨供应商风险偏好信息的揭示机制,证明信号博弈的分离均衡和混同均衡的存在,为供应商的决策提供了科学的指导。     

Observer Error When Measuring Safety-Related Behavior: Momentary Time Sampling Versus Whole-Interval Recording

Interval recording procedures are used by persons who collect data through observation to estimate the cumulative occurrence and nonoccurrence of behavior/events. Although interval recording procedures can increase the efficiency of observational data collection, they can also induce error from the observer. In the present study, 50 observers were trained to discriminate between safe and at-risk behavior, and were then exposed to two types of interval recording procedures: momentary time sampling (MTS) and whole-interval recording (WIR). The extent and sources of observer error were measured with signal detection methods (d′ and c). The results show that observers had greater misclassification of behavior when using WIR, over MTS. The findings also revealed that observers were consistently biased toward classifying behavior as “safe” when using WIR; safe bias was also found with use of MTS, but only after previous use of WIR.