大型单件小批生产模式下资源平衡问题的一种实用算法

大型单件小批生产是大型企业集团的典型生产模式之一，其主要特点之一是关键／瓶颈资源的利用率决定生产率。在总结各种生产计划与控制模式的基础上，并结合863／CIMS重点应用示范工程，提出了网络计划和MRP相结合的一种实用生产模式，在此模式下提出了解决资源平衡问题的一种实用算法。     

用非最大纠缠信道实现量子态的理想传输

为了使用非最大纠缠量子态作为传输信道实现量子态的理想传输,在接收端提出可逆纠缠匹配方法。该方法通过隐形传输中的张量表达式求出Bell基和2粒子计算基之间的过渡矩阵(测量矩阵),待发送端执行完Bell基测量,接收端得到坍缩态后引入若干个粒子组成辅助信道,从接收端量子态的张量表达式中可以看出辅助信道和传输信道以及测量矩阵之间的内在关系,利用此关系令辅助信道参数矩阵为传输信道参数矩阵和测量矩阵的乘积的逆矩阵,接收端对持有粒子和辅助信道进行Bell基测量和变换,即可恢复出初始态。该方法与引入单粒子辅助量子态的方法相比,可以实现量子态的理想传输。     

Variation in the effect of carcass decontamination impacts the risk for consumers

To enhance food safety, whole carcass decontamination during slaughter has been considered as a control measure to reduce pathogen concentrations on meat. The effect of such decontamination is usually measured in terms of the mean log reduction in concentration. However, the variation in this reduction may also contribute to the overall impact of the decontamination measure. Therefore, this study focuses on the relative contribution of mean and variation for the effect of decontamination in the slaughter-line expressed in terms of the effect on human health risk.A stochastic risk model is developed to assess the potential effects of pig carcass decontamination at the end of slaughter on the risk of salmonellosis for Danish consumers. Salmonella concentrations are represented by a lognormal distribution fitted to microbiological data, characteristic for Salmonella numbers on carcasses at the end-point of Danish slaughterhouses. Decontamination scenarios are represented by various gamma distributions with different means and standard deviations. The values chosen for these parameters are based on experimental data of the effect of real decontamination procedures applied to pork.Results show that the variation of decontamination has a relevant effect on risk reduction for the consumer: the higher the variation, the lower the overall risk reduction. This effect is particularly evident for procedures with a lower mean reduction (≤2.5 log₁₀), but less so for highly efficient decontamination procedures (>2.5 log₁₀ mean reduction). This difference is affected by the initial level of carcass contamination with Salmonella. With increasing mean and standard deviation of initial bacterial concentrations, it becomes increasingly relevant to account for the variation of the decontamination action, even if the mean decontamination effect is high.We conclude that for decontamination procedures with an overall mean reduction effect of 1–2 log₁₀, it is important to consider the variation in effect: if the variation is large, the final effect of decontamination can be considerably smaller than expected on the basis of the mean only and efforts should be put in place to reduce the variation of the procedure. However, when a treatment of high mean reduction (>2.5 log₁₀) is used, the impact of variation becomes smaller and may be negligible.     

基于项目管理的计量仪器维修管理研究

计量管理作为企业管理的一个重要内容，越来越被企业管理者所重视，其中计量仪器维修管理水平成为影响企业利润的重要因素之一。在这方面，目前的管理手段和方法还很难适应企业的发展需要。把项目管理的理论和思想融合到企业的计量仪器维修管理工作中去，用项目管理的方法指导计量仪器维修管理工作。以浙江中烟杭州制造部卷包车间在用的QTM综合测试台维修项目为例，利用项目管理理论对计量仪器维修项目的几个关键环节进行研究，并提出新的管理模式。     

网络计划技术在施工管理及招投标中的应用

分析了网络计划技术应用于施工管理的优点,并通过具体实例将网络计划技术与横道图进行了对比,说明了二者各存在的问题及如何相互补充应用,还指出在投标文件中编制网络计划所必须注意的问题,作为一种先进的方法,网络计划技术在施工管理中应与横道图结合使用,在招标投工作中更应很好运用。     

Solving Sturm-Liouville problems by piecewise perturbation methods, revisited

We present the extension of the successful Constant Perturbation Method (CPM) for Schrödinger problems to the more general class of Sturm-Liouville eigenvalue problems. Whereas the original CPM can only be applied to Sturm-Liouville problems after a Liouville transformation, the more general CPM presented here solves the Sturm-Liouville problem directly. This enlarges the range of applicability of the CPM to a wider variety of problems and allows a more efficient solution of many problems. The CPMs are closely related to the second-order coefficient approximation method underlying the SLEDGE software package, but provide for higher order approximations. These higher order approximations can also be obtained by applying a modified Neumann method. The CPM approach, however, leads to simpler formulae in a more convenient form.     

计算机系统集成项目的管理及应用

本文就以一个项目为例,讨论了一个项目经理在IT项目管理中的工作,主要分析了项目管理中项目经理的选择及要求、工作流程、工作内容等问题,希望通过本文,让我们能从整体上对项目管理中项目经理的含义进行认识,使新的项目经理能尽早入门,同时也希望各位前辈能够提出宝贵意见,让我们共同学习,共同为系统集成工程项目管理规范化和成熟化奉献力量。     

CPM编码调制发展前景

连续相位调制（CPM）技术是一类恒包络的数字调制技术,CPM信号的恒包络这一特性使它们对于非线性信道和衰落信道具有很强的抵抗性．特别适用于卫星通信和移动无线通信信道。与PSK调制方式相比,CPM调制系统不仅能够提供较高的频谱效率,而且具有一定的编码增益,这是因为接收器可以利用相位成型滤波器引入的记忆特性。CPM调制系统可以分解为一个连续相位编码器（CPE）和一个无记忆调制器（MM）的级联,因此出现了多种卷积码与CPM结合的调制方案,例如串行级联连续相位调制、基于环的串行级联连续相位调制、实用的连续相位调制、卷积编码器与扩展信道编码器的串行级联,等等。其中,基于环的串行级联连续相位调制具有很好的性能,在交织增益、自由距离、误码平层和收敛门限可能成为未来连续相位编码调制系统的发展方向。     

一种基于循环平稳性的CPM信号调制阶数盲识别算法

本文利用CPM信号的循环平稳性,深入分析了M进制CPM信号循环谱密度函数与信号调制阶数之间的内在联系,并在此基础上提出了一种基于信号循环平稳性的CPM信号调制阶数盲识别算法.实现了任意调制指数和频率成形脉冲的CPM信号调制阶数盲识别,为CPM信号的盲解调奠定了基础.计算机仿真结果与分析表明,该算法具有较高的正确识别率,并且受高斯噪声影响较小,实现简单,有实用意义.     

工程设计项目计划技术的改进与应用研究——ADePT与CPM的“牵手”

工程设计区别于土建施工,有其自身的特点,采用常规的关键路径法（cPM）技术不能解决设计计划中的“反复”和“循环”问题。为此,可以采用分析设计计划技术（ADEPT）对CPM技术加以改进,并应用于设计计划管理。改进后的方法在建立依赖结构矩阵（DSM）的基础上,运用遗传算法进行DSM优化,将设计“反复”和“循环”包装成“环节点”,回归到常规的CPM表现形式中,实现了ADEPT和CPM的结合,应用实例对此改进做了验证。该方法适用于以信息加工为特征、以非物质产品或服务为成果的项目。