信息设计四段化研究方法及实例分析

信息设计是一门新兴的、多元化的交叉学科,本文针对信息设计在我国教学中的具体情况,结合信息社会中的实际应用情况,系统地提出将信息设计的四段化研究方法,并以更好地组织信息设计这门现代学科的各项内容为目的,进行了实例分析。     

自动化立体仓库中货位实时分配优化问题研究

本文研究了单元货格式自动化立体仓库中的货位实时分配问题。该问题可分为两方面：为入库分配空货位和为出库选择货位。在考虑了堆垛机的加减速对其运行速度的影响后,以堆垛机将要进行的所有操作的行程时间之和作为优化目标,通过调整堆垛机的后续操作的行程时间在总行程时间中的权重,依次构建了三个优化目标函数。然后利用结合了模拟退火方法的遗传算法对其进行了求解,并利用了多种技术提高算法的效率。最后利用仿真技术,通过改变仿真时系统中的货物类型总数、堆垛机的停留策略和装载能力,对该算法在不同情况下的效果进行了验证。仿真结果表明在不同情况下,该算法都可不同程度地减少堆垛机的平均行程时间。     

新时期加强高校生态文明教育的有效途径

通过多次纺丝与退火工艺在普通玻璃载玻片上制备ITO透明导电薄膜,研究了退火工艺对薄膜表面形貌的影响。结果表明：退火不仅提高了ITO颗粒的洁净程度,同时减小了其在薄膜表面的粒径分布。多次纺丝与退火可以提高ITO颗粒的覆盖密度,得到致密性比较好、表面缺陷比较少、表面粗糙度比较小、均匀平整的透明导电薄膜。     

Theoretical Support and Other Considerations in Using Simulated Clients to Educate Social Workers

This article builds on literature from many helping disciplines supporting the use of simulated clients (sometimes referred to as standardized patients) in training professional students, explaining why the use of simulated clients is more effective in developing clinical skills as compared with student-to-student role-plays. Psychodynamic and Bowen intergenerational family theory, critical to the development of social work knowledge, is used to support the use of simulated clients to portray clients with challenging and complex lives. Risks and benefits of using simulated clients is discussed, along with recommendations to educational programs regarding ways to effectively use this experiential learning method.     

突发事件下的医院应急群决策模型研究*

针对突发事件下的医院应急管理问题,进行了医院应急群决策模型研究。考虑到医院应急决策者心理行为特征的偏向性,将病人应急方案的选择设计成一个以医院决策者信息与病人集结信息之间距离最小为目标的非线性规划模型。根据病人的伤重程度和应急资源使用度的损益值,获得医院应急情景下的综合价值,根据累积前景理论,通过计算区间概率,获得医院应急情景下不同应急方式的累积前景值。使用模拟植物生长算法求解,莸得病人的最优集结信息。案例分析表明,该决策过程可以使得突发事件下医院应急管理方案达到最优。     

Bayesian estimation of parameters of inverse Weibull distribution

The present paper describes the Bayes estimators of parameters of inverse Weibull distribution for complete, type I and type II censored samples under general entropy and squared error loss functions. The proposed estimators have been compared on the basis of their simulated risks (average loss over sample space). A real-life data set is used to illustrate the results.     

射频反应溅射法制备SnO2-x纳米薄膜的气敏特性研究

采用射频反应溅射法在不同氧气分压下制备SnO2-x薄膜,然后在不同温度下对其进行退火处理．利用X射线衍射分析（XRD）和扫描电子显微镜（SEM）等表征技术,研究了制备备件对SnO2-x薄膜的结晶性能和表面形貌的影响．研究结果显示．当氧气分压为50％时,可以制备出质量较高的SnO2-x纳米薄膜．当退火温度从450℃升高到550℃．样品的电阻率降低．退火温度500℃的样品在工作温度225℃时,对乙醇有较高的灵敏度．灵敏度达67％,对丁烷的灵敏度不高．     

主成分回归能消除多重共线性吗?

主成分回归方法已得到广泛应用,但该方法是否能减小参数估计的误差,理论上并没有明确的结论。以3个假设模型为例,运用模拟计算的方法对主成分回归方法进行了研究,发现主成分回归估计的误差可能比普通最小二乘估计更小,也可能更大,依赖于实际的模型。     

Investigating the assumption of homogeneity of treatment effects in clinical studies with application to meta-analysis

An important part of the evaluation of a therapy is an investigation of the assumption of homogeneity of its effect across pre-defined subpopulations. In this paper we describe simple graphical presentations that could be used to assess the homogeneity of treatment effect and identify outliers. The emphasis in the paper is on meta-analysis but the methods described can be generalized to other investigations.     

On progressive hybrid censored exponential distribution

In this paper, we introduce a new adaptive Type-I progressive hybrid censoring scheme, which has some advantages over the progressive hybrid censoring schemes already discussed in the literature. Based on an adaptive Type-I progressively hybrid censored sample, we derive the exact distribution of the maximum-likelihood estimator (MLE) of the mean lifetime of an exponential distribution as well as confidence intervals for the failure rate using exact distribution, asymptotic distribution, and three parametric bootstrap resampling methods. Furthermore, we provide computational formula for the expected number of failures and investigate the performance of the point and interval estimation for the failure rate in this case. An alternative simple form for the distribution of the MLE under adaptive Type-II progressive hybrid censoring scheme proposed by Ng et al. [Statistical analysis of exponential lifetimes under an adaptive Type-II progressive censoring scheme, Naval Res. Logist. 56 (2009), pp. 687–698] is obtained. Finally, from the exact distribution of the MLE, we establish the explicit expression for the Bayes risk of a sampling plan under adaptive Type-II progressive hybrid censoring scheme when a general loss function is used, and present some optimal Bayes solutions under four different progressive hybrid censoring schemes to illustrate the effectiveness of the proposed method.