基于时变需求的供应链基本库存水平优化研究

在时变需求环境下,基于模型推导得到供需双方基本库存水平局部优化与整体优化决策方程,并基于算例对基本库存水平整体优化的成本绩效以及需求时变性的影响进行数据分析,得到如下重要结论:基本库存水平整体优化明显降低供应链库存成本.     

对女性个体经验的言说——论玛丽·雪莱的《玛西尔达》

玛丽·雪莱在《玛西尔达》借助于对女性个体经验的言说,直言了女性在父权社会主体性场域内外的个体经验的文化困境。     

中国房地产税制:存在问题与改革设想

在现代市场经济条件下,房地产税制具有十分重要的功能。现阶段中国房地产税制存在房地产税收功能分散,房地产税种设置交叉重叠现象突出,计税依据不符合国际惯例,房地产保有环节税负偏轻和房地产税权分布结构不合理等问题。中国房地产税制改革已进入基础性制度建设阶段,必须按照"宽税基、简税种、低税率"的原则,实现房地产开发流转环节税收为主向房地产保有环节税收为主的房地产税制转型,去土地财政化,这就要适时开征房产税。开征房产税可以分两步走,近期对居民新购商品房超免税标准部分征收房产税,中长期覆盖到居民已购存量房地产。     

论苏区邮政检查的操作方法与纪律

为了获得情报，肃清内奸，加强宣传，反制敌方邮检，苏区实行了邮检制度。邮检对象包括：密写、密函信件，记录有军政情报内容的胶卷、录音带、录像带、报刊杂志，夹藏有显微点以及炸弹、毒品、恐吓信、内容反动的信件或者出版物。邮检方式主要有四种。对受检邮件的处理方式有三种。总之，苏区对邮检极为重视，除严格选拔邮检员外，还制定了纪律，操作也较规范。     

A transnational networked public sphere of air pollution: analysis of a Twitter network of PM2.5 from the risk society perspective

ABSTRACT

Drawing on digitaltrace data, publicly accessible government documents, and journalistic reports, this research integrates Beck’s risk society theory with digital media theories to examine the mediated process of risk definition and assessment of PM2.5 (particulate matters with a diameter less than 2.5 micrometers) in a networked public sphere. Network and content analysis of a PM2.5 Twitter network shows that political and professional elite remained the most powerful producers of risk definition. Established media played a key role, yet faced challenges from a variety of actors who disseminated and filtered information. Laypersons, while peripheral, actively interacted with elite and established media. The blurring geographic boundary in the PM2.5 Twitter network revealed an emerging transnational public sphere, which, however, was segregated by language. This research advances a layered understanding of the contingent, paradoxical media impact for social changes in a risk society.     

Small‐sphere distributions for directional data with application to medical imaging

We propose novel parametric concentric multi‐unimodal small‐subsphere families of densities for p ? 1 ≥ 2‐dimensional spherical data. Their parameters describe a common axis for K small hypersubspheres, an array of K directional modes, one mode for each subsphere, and K pairs of concentrations parameters, each pair governing horizontal (within the subsphere) and vertical (orthogonal to the subsphere) concentrations. We introduce two kinds of distributions. In its one‐subsphere version, the first kind coincides with a special case of the Fisher–Bingham distribution, and the second kind is a novel adaption that models independent horizontal and vertical variations. In its multisubsphere version, the second kind allows for a correlation of horizontal variation over different subspheres. In medical imaging, the situation of p ? 1 = 2 occurs precisely in modeling the variation of a skeletally represented organ shape due to rotation, twisting, and bending. For both kinds, we provide new computationally feasible algorithms for simulation and estimation and propose several tests. To the best knowledge of the authors, our proposed models are the first to treat the variation of directional data along several concentric small hypersubspheres, concentrated near modes on each subsphere, let alone horizontal dependence. Using several simulations, we show that our methods are more powerful than a recent nonparametric method and ad hoc methods. Using data from medical imaging, we demonstrate the advantage of our method and infer on the dominating axis of rotation of the human knee joint at different walking phases.     

道路与桥梁专业校企合作共建实践教学基地模式探析

高职院校应培养有较强实践能力的实用型人才。然而,我国高职院校专业教学中的理论教学与实践教学往往难以融为一体,培养出的学生很难达到企业的要求。校企合作共建实践教学基地,是破解此弊端的一剂良方。文章就江西交通职业技术学院校企合作共建实践教学基地做了探析。     

职校内生产性实训基地建设的实践与思考

结合江苏省连云港中等专业学校机电专业校内生产性实训基地建设的具体案例,从中职学校校内实训基地建设现状入手,理论融合实践进行分析,对以教育功能为主体、校办企业为基础的主导式校内生产性实训基地的建设开展实践性研究,并从管理体系、运行体系、评价体系三个方面进行了阐述。     

基于农产品出口基地视角的安徽农产品出口促进体系研究

安徽省是农业大省,但是农产品出口贸易额在全国却处于相对落后水平。为促进农产品出口,安徽建立了一系列农产品出口基地。文章通过对安徽农产品出口基地的农产品出口现状进行分析,探究安徽省农产品出口支持政策的现状、找出安徽省农产品基地出口促进体系中政策所存在的问题,提出诸如加大资金扶持和指导创立培育品牌及完善农产品质量安全体系等对策。