作业成本法在中小型企业应用的研究

作业成本法作为一种先进科学的成本核算和管理方法 ,不仅适用于技术先进的大型企业 ,同样也可用于制造费用较高的中小型企业。本文通过在中小型企业中应用作业成本法的尝试性研究 ,指出我国中小型企业应用作业成本法的可行性和必要性。     

A Stochastic Geometry Model for Functional Magnetic Resonance Images

In functional magnetic resonance imaging, spatial activation patterns are commonly estimated using a non-parametric smoothing approach. Significant peaks or clusters in the smoothed image are subsequently identified by testing the null hypothesis of lack of activation in every volume element of the scans. A weakness of this approach is the lack of a model for the activation pattern; this makes it difficult to determine the variance of estimates, to test specific neuroscientific hypotheses or to incorporate prior information about the brain area under study in the analysis. These issues may be addressed by formulating explicit spatial models for the activation and using simulation methods for inference. We present one such approach, based on a marked point process prior. Informally, one may think of the points as centres of activation, and the marks as parameters describing the shape and area of the surrounding cluster. We present an MCMC algorithm for making inference in the model and compare the approach with a traditional non-parametric method, using both simulated and visual stimulation data. Finally we discuss extensions of the model and the inferential framework to account for non-stationary responses and spatio-temporal correlation.     

剖析"成本元"

从经营战术和经营战略两个层面对成本元这一概念的内在含义进行剖析,由"成本分配观"的成本元和基于"过程观"的成本元分析,可实现正确选择作业量量化基准,精确计量产品成本,消除无效作业,达到提高企业经营业绩的目的;由"结构性"成本元和"执行性"成本元分析,有利于企业从组织整体和全局的高度选择适当、合理的结构性投入配置并进行执行性投入的强化,使企业达到成本革新控制的效果.     

新型的电平移位电路设计

针对高压驱动电路控制提出了新的具有很大驱动电流和很小静态功耗电平移位栅电压控制电路。该电路主要利用二极管的反向工作特性,结合正反馈电路,分别为输出级PMOS管和NMOS管提供可靠栅驱动信号。该电路采用CSMC的0.5μm工艺实现,测试结果表明,所设计的电平转换功能得到实现,且转换速度快。     

基于C 的电火花机床PMLSM驱动二次开发及性能测定

根据电火花加工的动作特点,对已有的PMLSM 电机的伺服驱动器进行二次开发,即利用MSComm通信控件对伺服驱动器进行控制,同时开发了控制界面。利用开发的系统进行了试运行,并对永磁直线同步电动机（PMLSM ）直线驱动装置进行了定位精度和重复定位精度测试,结果表明PMLSM直接驱动具有非常高的定位精度与重复定位精度,最后分析了影响精度指标的原因及改进方法。     

铁路机车司机的心理资本和心理健康

通过对64位铁路机车司机的实证研究,探讨这一群体的心理资本及希望、坚韧性和乐观三种积极心理状态与心理健康十项指标的关系。得出的结论是机车司机的希望和心理资本对他们的9项心理症状及总症状指数都有显著的负向预测作用,机车司机的坚韧性对他们的人际关系敏感和抑郁有显著的正向预测作用,对其他变量无预测作用,而机车司机的乐观只对他们的抑郁有显著的负向预测作用。     

视频磁头圆弧面的检测原理

结合光学及电磁学的基本原则，阐明了检测视频磁头圆弧面的原理，并对观察结果进行了计算和分析。明确了为得到最佳的记录效果，磁头的几何尺寸所应满足的某些条件并要求接触点与磁头缝隙的中心点相一致。     

Bayesian analysis of dynamic magnetic resonance breast images

Summary.  We describe an integrated methodology for analysing dynamic magnetic resonance images of the breast. The problems that motivate this methodology arise from a collaborative study with a tumour institute. The methods are developed within the Bayesian framework and comprise image restoration and classification steps. Two different approaches are proposed for the restoration. Bayesian inference is performed by means of Markov chain Monte Carlo algorithms. We make use of a Metropolis algorithm with a specially chosen proposal distribution that performs better than more commonly used proposals. The classification step is based on a few attribute images yielded by the restoration step that describe the essential features of the contrast agent variation over time. Procedures for hyperparameter estimation are provided, so making our method automatic. The results show the potential of the methodology to extract useful information from acquired dynamic magnetic resonance imaging data about tumour morphology and internal pathophysiological features.     

磁罗盘的罗差分析与验证

针对基于最佳椭圆拟合的磁罗盘误差补偿算法,设计了一组模拟不同类型干扰磁场的数据采集与罗差分析实验。通过对磁罗盘在各种干扰磁场下表征测量数据特性的拟合椭圆参数与最终补偿效果的详细分析,对理论公式进行了比照与补充,同时探讨了软铁干扰磁场与硬铁干扰磁场的相互作用关系以及在综合磁航向误差中各自所产生的影响。     

微波ECR等离子体参数测量及分析

利用双探针测试了微波ＥＣＲ等离子体参数，发现获得大面积均匀等离子体源强烈依赖于轴向磁场梯度，等离子体参数受气压影响亦很大．测量结果与理论分析一致．