Class, gender and time poverty: a time-use analysis of British workers' free time resources

Free time, that is, the time that remains at one's own discretion after conducting daily work and personal care activities, has been previously recognized as a 'primary good' and an important welfare resource that provides opportunities for participation in social life and leisure. However, recent years have witnessed an increasing preoccupation with the phenomenon of time poverty, drawing attention to the distribution of free time and its relationship to structural and family circumstances. In this article we propose a novel approach to the measurement of time poverty and document its occurrence amongst British workers. In line with previous literature, a conceptualization of time poverty as a relative lack of free time resources vis-à-vis other members of the community is adopted. However, unlike previous empirical studies, we investigate the differential configuration of time poverty on weekdays and weekend days, alongside indicators of the quality of free time, taking into account insights from theoretical and empirical work within the field of the sociology of time. Our analysis of the 2000 UK Time Use Survey highlights class and gender inequalities that have been missed by previous measurement approaches and demonstrates that, overall, working women experience multiple and more severe free time constraints, which may constitute an additional barrier for their leisure and social participation.     

孙中山的人学思想及其现实意义

孙中山的人学思想产生于19世纪末20世纪初的近代中国,是在其"致力国民革命四十年,求中国之自由平等"的斗争实践中逐渐形成的。它内涵丰富、意蕴深远,涉及互助人性论、民生观、自由平等观、"生元"说以及人生观等方面的内容。探讨发掘孙中山的人学思想中蕴含的积极合理成分,在当代无疑具有重要的现实意义。     

管理科学与工程学科基金项目资助和SCI论文发表情况分析

系统地统计了2003～2008年国家自然科学基金委员会管理科学部管理科学与工程学科面上项目和青年项目受资助的总体情况,分析了各个子学科类别的资助状况和发表SCI论文情况,同时分析比较了国家"十一五"与"十五"期间的资助项目情况和发表SCI论文数量情况,找出其中存在的问题并对其原因进行了分析.最后,依据国家自然科学基金"十一五"发展战略,提出今后国家自然科学基金资助策略和建议.     

四方控制权制衡、自由现金流量与过度投资行为

目前关于过度投资的研究主要集中在债务融资对过度投资行为的影响上,关于公司控制权制衡与过度投资行为关系的研究基本还是空白。本文通过对自由现金流量和过度投资行为的进一步分析,从控制权制衡角度出发,构建以股东、董事会、监事会和债权人四方为主的过度投资行为制衡模型,研究我国上市公司控制权制衡、自由现金流量与过度投资行为之间的关系。     

Slack free MEA and RDM with comprehensive efficiency measures

This paper extends two directional distance function models, the Multi-directional Efficiency Analysis (MEA) Model and the Range Directional Model (RDM), in order to account for any type of technical inefficiency, i.e. both directional and non-directional inefficiencies. We first focus on the variable returns to scale (VRS) case, because both VRS-MEA and RDM are translation invariant models, which mean that both models are able to deal with negative data. Our main result is the definition of a new comprehensive efficiency measure which is units invariant and translation invariant and covers both models. Secondly, we introduce the RDM model under constant returns to scale (CRS) together with a new comprehensive efficiency measure.     

节目试看对网络视频运营商市场策略影响研究

随着网络视频运营商收费节目试看的兴起，而节目试看对网络视频运营商诸如市场规模，利润等市场策略的影响所知甚少。本文在考虑网络用户情绪效用情况下，通过构建高质量视频运营商首播节目与后来跟进的低质量视频运营商播出该节目的博弈模型，研究高质量视频运营商首播节目之前提供节目试看对两个运营商收费模式下的节目最优收费价格和免费模式下的最优嵌入广告量以及视频节目提供模式选择的影响。研究表明，高质量视频运营商在节目首播之前提供节目充分试看能够实现节目最优收费价格最高，利润最大，因此节目充分试看是其最优策略；并且低质量运营商在其单位广告收益与用户单位广告"成本"满足一定条件下，高质量运营商提供的节目的充分试看能够减少低质量运营商总利润，因此避免低质量视频运营商搭乘节目试看的顺风车；高质量视频运营商提供节目充分试看情况下，高质量视频运营商只采取收费模式为其最优市场策略，低质量视频运营商采取免费模式为其最优市场策略。本文的研究成果对网络视频运营商日常运营有一定的管理学启示与应用价值。     

基于分层MTO订单的准入策略研究

研究按订单生产(make to order,MTO)模式下随机订单的准入策略.本文提出的准入决策方法分为两步,首先在考虑随机订单的不同属性基础上,采用TOPSIS(technique for order preference by similarity to an ideal solution)方法计算新到订单与理想订单的接近程度,以此作为订单的综合收益,从而对新订单进行分层排序;其次采用MDP(Markov decision process)模型分别计算接受和拒绝订单的期望收益,从而决定是否接受该订单.研究发现,当市场需求接近或大于产能时,企业可从订单分层中获益;反之,市场需求显著小于产能时,分层不会带来额外收益.企业分层收益随需求增加或产能减少而递增,且与生产前置期呈倒U型关系.数值模拟发现,订单分层越精细,收益越大,且分层数约为需求与企业产能的比值时,订单分层收益接近最大值.     

Machine Learning Vasicek Model Calibration with Gaussian Processes

In this article, we calibrate the Vasicek interest rate model under the risk neutral measure by learning the model parameters using Gaussian processes for machine learning regression. The calibration is done by maximizing the likelihood of zero coupon bond log prices, using mean and covariance functions computed analytically, as well as likelihood derivatives with respect to the parameters. The maximization method used is the conjugate gradients. The only prices needed for calibration are zero coupon bond prices and the parameters are directly obtained in the arbitrage free risk neutral measure.     

论“兴”义的演变及其思维特点

既往对兴的理解大致可分为内容关联说、声韵限制说和音义关联说,但在实际文本中,却存在一种既无关内容,亦无关声韵的兴体。现有兴体多样化成因论多停留在事实的层面,着眼于历史语境等外在性因素,而缺乏对兴体自身的考察。因此,借鉴索绪尔的语言学理论,从自由的维度出发,我们发现作为表现手法的"兴"亦是人自由创造的产物,即是一种基于自由意志的音、义任意关联,它不是一种实体的指涉,而是一种关系的表述,这种关系,存在于兴句与其所对应的正句之间。     

随注随学：开放大学招生模式选择与创新

“随注随学”是指学生通过网络随时进行报名注册、并且随时进行课程学习的入学学习模式.这种通过网上报名、生成注册号、课程学习、现场确认、数据上报、学籍注册等流程形成的创新性的开放式招生管理模式,可以有效弥补目前开放大学只能一年两季定时入学的不足.