网络社区发现算法在流动表建模中的设计与应用

代际流动表可以统计子代与其父代社会地位配对数据的交互频数,反映了社会资源占有的优劣势在父子两代人之间的比较。对财富、阶级、特权等社会基本特征演变的实证考察,均依赖于代际流动表的量化分析。对数线性模型是流动表建模分析的基本工具,通过对列联表单元格频数进行拟合,可以识别流动表行分类与列分类之间的强弱交互效应,刻画父子社会地位间的交互结构。本文利用复杂网络社区发现算法分析父子社会地位的关联结构,针对简约对数线性模型拟合精度不够的问题,提出一种新的建模思路：利用社区发现算法对简约对数线性模型的残差列联表进行关联关系挖掘,将发现的社区效应作为附加参数约束引入原对数线性模型,以改善数据的拟合情况。由于该方法只在原简约对数线性模型中增加了一个参数约束,因此仍可以保证建模结果的简洁性及理论意义,同时社区效应补充了原对数线性模型对经验数据结构的解读。论文用此方法对来源于中国综合社会调查数据的经验代际职业流动表进行建模分析,较好地解释了子代职业阶层与父代职业阶层间的关联模式。     

Probabilistic population projections for countries with generalized HIV/AIDS epidemics

In 2015, the United Nations (UN) issued probabilistic population projections for all countries up to 2100, by simulating future levels of total fertility and life expectancy and combining the results using a standard cohort component projection method. For the 40 countries with generalized HIV/AIDS epidemics, the mortality projections used the Spectrum/Estimation and Projection Package (EPP) model, a complex, multistate model designed for short-term projections of policy-relevant quantities for the epidemic. We propose a simpler approach that is more compatible with existing UN projection methods for other countries. Changes in life expectancy are projected probabilistically using a simple time series regression and then converted to age- and sex-specific mortality rates using model life tables designed for countries with HIV/AIDS epidemics. These are then input to the cohort component method, as for other countries. The method performed well in an out-of-sample cross-validation experiment. It gives similar short-run projections to Spectrum/EPP, while being simpler and avoiding multistate modelling.     

吊挂式高楼清洗机

安全可靠的高楼清洗设备设计已成为当前重要课题。由于高空作业要求安全、稳定、贴墙、行走、平衡等,文章突破吊栏等传统结构,采用双钢丝吊挂式设计,从材料选用到自带电、液结构等方面,对高楼清洗机进行了优化设计,保证高楼清洗机的安全、轻便与简洁。     

Parenting a child with Autism Spectrum disorder: parental work context

This research contributes to the literature on work-related factors for parents raising a child with a disability. Specifically, we used questionnaire methodology to compare two parent families raising a child with Autism Spectrum (AS) with similar families raising ‘typical’ children. Our findings suggested that parents raising a child with AS self-report higher parenting stress and more mental health symptomatology, as well as lower overall job satisfaction, less satisfaction with supervisors and less workplace contentment. In addition, our findings suggested that parents raising a child with a disability self-report similarly to parents raising ‘typical’ children with respect to work interest, commitment and quality, as well as time missed. In conclusion, our results appear to suggested that despite increased parental stress related to parenting a child with AS, with respect to several work-related factors, there are more similarities than differences among these parenting groups.     

阿尔都塞意识形态理论研究述评

阿尔都塞的意识形态理论独树一帜,也曾产生过巨大影响。近年来,学术界对阿尔都塞的研究也日益聚焦于此。从目前来看,人们不仅探讨了这一理论的思想渊源和主要内容,而且也对其进行了正反两方面的中肯评价。尽管阿尔都塞在诸多方面拓展了马克思主义意识形态理论的研究领域,甚至触及到经济基础和上层建筑相互作用的机制问题,但其保卫马克思的"初衷"并未真正如愿以偿。     

高层建筑竖向控制及其精度的研究

研究了高层建筑的竖向控制及其精度,结合实例,分析了它的精度和有效性,计算结果表明,精度是令人满意的。     

工业检测仪表性能检定设备与方法分析

本文针对某些工业检测仪表因检定(分度)条件和现场使用条件不同而使原定准确度等级名实不符的弊端,提出了根据不同类型仪表采取不同检定(分度)方法和装置的设想。文中对便携式表面温度计、热阻式热流计及辐射式温度计等几种受现场使用条件影响较大的仪表,给出了具体检定方法及装置。     

提高高等学校大型仪器设备使用效益的探索

针对目前高等学校大型仪器设备方面存在的资源配置不合理、使用效率低下的现状,提出了构建大型仪器设备资源共享平台的管理思路,以提高高等学校大型仪器设备的使用效益。     

高效率数字音频功率放大器

本文介绍了用常用器件设计、制作数字功率放大器的方法。     

快速傅里叶变换在导热逆问题中的应用

本文用通过快速傅里叶变换来进行逆拉氏变换的方法解决导热逆问题。众所周知,内点温度的测量误差往往导致导热逆问题计算的不稳定。作者用频谱分析的概念解决了这一困难。文中提出了测量温度时固体内点不同位置、内点温度的测量误差以及数值计算可采用的时间步长之间的关系。计算实例表明,本文所提供的方法对于瞬变现象的研究有很大的实用价值。