3M公司汽车市场新产品扩散模型分析

基于BASS模型,对3M公司历年来汽车相关产品销售历史数据利用非线性最小二乘法拟合扩散系数和创新系数。通过对扩散系数和创新系数的分布特性的研究,发现3M公司不同类别新产品有各自类似的市场扩散特性。     

六西格玛下的质量成本优化模型研究

文章通过分析传统质量成本优化模型的局限性和六西格玛质量管理的特点,提出以绝对量模型和相对量模型为基础,构建六西格玛质量管理下的质量成本优化模型,促使产品质量由三西格码到六西格玛不断提高,企业的利润不断增加,质量成本占销售额的比重不断下降。     

Adaptive Learning in an Expectational Difference Equation with Several Lags: Selecting among Learnable REE

It is demonstrated that adaptive learning in the least squares sense may be incapable of satisfactorily reducing the number of attainable equilibria in a rational expectations model when focusing on the forward‐solutions to the model. The model examined, as an illustration, is a basic asset pricing model for exchange rate determination that is augmented with technical trading in the currency market in the form of moving averages since it is the most commonly used technique according to questionnaire surveys. The forward‐solutions to such a model are preferable to the backward‐solutions that are normally utilized since announcement effects is an important feature in currency trade. Because of technical trading in foreign exchange, the current exchange rate depends on j _max lags of the exchange rate, meaning that the model has j _max+1 rational expectations equilibria, where several of them are adaptively learnable in the least squares sense. However, since past exchange rates should not affect the current exchange rate when technical trading is absent, it is possible to single out a unique equilibrium among the adaptively learnable equilibria that is economically meaningful. It is worth noting that the model examined can also be viewed as a model for stock price determination in which the forward‐solutions to the model are preferable to the backward‐solutions since the importance of announcement effects is a common characteristic for currency and stock markets.     

Managerial actions and nominal stock price levels

We examine nominal and real stock prices and the sequential price pattern of stock dividends and stock splits. We find that the average stock price has been fairly stable over time except for two decades in the beginning and end of the twentieth century. Inclusion of these periods yield a decline over time which is generally consistent with the drop in price levels found by Chittenden et al. [2010. “A Note on Affordability and the Optimal Share Price.” Financial Review 45: 205–216]. In a multivariate setting, the frequency of stock dividends and stock splits is positively related to the frequency for these events the prior year and recent market return. In further tests of the price change we find a positive relationship to the median price change for stock dividends/splits and negatively to labour income growth for stock splits. These findings indicate that stock price reduction via stock dividends and splits attracts individual investors as income grows. One key conclusion is that the primary reason for any stock action, dividend or split, is to fit the ‘norm’ stock price level of the market.     

公差原则及其应用

对ＧＢ／Ｔ４２４９－１９９６《公差原则》的图样标注、应用范围、检验等学习体会予以交流。     

代理人产出影响因素调查分析

本文作者在进行针对代理人的问卷调查的基础上,对影响代理人产出的各个影响因素进行了统计分析,并进一步与历史调查结论进行比较,讨论影响代理人产出的各个影响因素及其变化,以及这些调查数据分析结论对保险个人代理人的招聘工作的理论借鉴。     

斗轮式取料机瞬时取料量自动控制技术的研究及其节能应用

秦皇岛港是目前全球最大的煤炭输出港,它以"悬臂式斗轮取料机-皮带机输送机-装船机"为主要转运设备进行煤炭装船作业。本文旨在探索高效的取料机作业方式来实现装船作业效率的最大化,降低作业能耗。分析了斗轮取料机的特点及其取料操作方式,并在此基础上引入了闭环自动控制方法,构建了以恒定瞬时取料量为控制目标的闭环控制系统。该系统以PLC为控制核心,基于变频驱动的回转系统作为执行部分控制斗轮取料机的悬臂回转速度进行取料作业,同时通过皮带秤实时检测输送带瞬时取料量并结合即时的斗轮驱动电机电流数据作为作业实时数据反馈,由此构建了一种基于Profibus-DP现场总线的斗轮取料机自动作业控制系统。该系统试运行于河北港口集团秦皇岛港股份有限公司第六港务分公司,提高了取料作业效率,减少了人为因素造成的超载作业,节能效果显著。     

二元结构环境下的IPO定价模型研究

本文传承我国国情和股票发行定价制度的历史、现状,基于相对估价法的基本原理,采用"变异系数法"分析企业特质,辅之以相关性的技术处理,构建了一个企业特质评价指标体系,采用"标准化加权评价法"加以评价后,创造性地通过"标准差倍数法"的技术处理将之纳入定价模型.然后分别立足于一级市场和二级市场,构建一步静态模型和两步静态模型,为检验模型的应用效果,本文提出了IPO定价的四个检验标准,并做了实证检验评估.最后结合新股循价制度改革和实践,对IPO定价问题做进一步的检验探讨.     

基于总体最小二乘准则的OFDM系统时变信道估计

信道估计的准确程度直接影响正交频分复用系统的性能。为了提高时变信道估计算法的精度,基于总体最小二乘准则(TLS)提出了一种时变信道的估计方法。该方法用线性模型对时变信道进行建模,不仅考虑了信道噪声,同时也兼顾了模型误差。该方法能较好地跟踪信道的变化,显著消除模型误差。仿真结果表明所提算法的均方误差介于最小二乘算法与最小均方误差算法之间,在不同归一化多普勒频移下,该算法具有较好的稳健性。