从社会距离看农民工的社会融入

本文根据问卷调查的数据指出,农民工对城市生活和城市认同程度很高,但对城市居民的评价不高;对于城市生活中被区别对待和排斥的感觉不强烈,但对于与城里人的差别感觉较强烈;对于城市生活方式适应得比较快,没有多少自卑感,但对城市人际关系表现出一定程度的不适应。     

远程学习者网络有效学习的影响因素研究——以河南省中小学教师远程培训为例

随着以互联网技术和计算机多媒体技术为代表的信息技术的快速发展,借助信息技术开展的教师远程培训已经成为实现教师专业能力发展的一种主要手段。河南省在积极推进中小学教师远程培训的同时,其培训成效并不明显。因此如何提高网络学习的有效性,确保培训的质量显得至关重要。本研究从网络有效学习的概念和影响因素的角度进行研究,并通过对参加过远程教师培训的学习者进行访谈,结合相关质性材料的分析,最终得出关于远程学习者网络有效学习的影响因素:学习者因素、教师因素、网络课程因素、环境因素和交流共享,以期对学习者如何实现网络有效学习和提高教师远程培训的质量有所启发和帮助。     

现代远程教育管理模式和评价体系探析

我国现代远程教育的发展可以说是突飞猛进 ,但在实现高等教育跨越式发展中不仅要保证数量 ,更要保证质量 ,因此 ,网络教育如何在实施过程中加强教学及教务管理 ,建立有效的质量评价体系显得尤为重要。本文拟从我国现有的网络教育模式中总结经验 ,探索现阶段我国现代远程教育的管理模式及有效的评价体系     

尼采哲学的意义生存模式

尼采的生存论哲学提供了一种具有积极意义的生存模式,即生命—创造—生成—超人—永恒轮回。其中权力意志是生命存在价值的内在动力,它激活生命,不断能动地为生命创造、生成各种可能性的意义存在。生命的本质内涵是自我创造,不断生成和毁灭,这一过程永恒轮回,在永恒轮回中有可能生成为最高的意义存在即超人。这一生存模式由于夸大感性和意志而忽视了人存在的社会性与现实性。     

Ultrahigh-dimensional sufficient dimension reduction for censored data with measurement error in covariates

In this paper, we consider the ultrahigh-dimensional sufficient dimension reduction (SDR) for censored data and measurement error in covariates. We first propose the feature screening procedure based on censored data and the covariates subject to measurement error. With the suitable correction of mismeasurement, the error-contaminated variables detected by the proposed feature screening procedure are the same as the truly important variables. Based on the selected active variables, we develop the SDR method to estimate the central subspace and the structural dimension with both censored data and measurement error incorporated. The theoretical results of the proposed method are established. Simulation studies are reported to assess the performance of the proposed method. The proposed method is implemented to NKI breast cancer data.     

内部控制、国家距离与跨国并购绩效

近年来,随着国际形势不确定性加剧、逆全球化思潮和单边保护主义抬头,我国企业海外并购面临的风险不断提升。基于2008—2018年我国A股上市公司跨国并购数据,实证检验了内部控制在我国企业国际化经营活动中发挥的作用。研究发现：高质量内部控制能显著提升企业的跨国并购绩效,但东道国与我国的地理距离和文化距离越远,内部控制对跨国并购绩效的正向影响越弱。进一步分解内部控制五要素发现,内部控制主要通过风险评估和内部监督要素正向影响跨国并购绩效。异质性分析表明,高质量内部控制提升跨国并购绩效的效应在并购方具有跨国并购经验和跨国并购交易规模较大时更为显著。因此,建议监管部门或行业组织出台有关企业海外经营与发展的内部控制指引,企业也应重视与强化海外经营发展过程中的内部控制体系建设,并关注国家距离因素的影响,以降低跨国并购风险。     

An iterative procedure for robust circle fitting

The problem of fitting circles and circular arcs to observed points arises in many areas of science. However, the fitting results by using most geometric and algebraic methods are not usually acceptable in the presence of outliers. An iterative procedure for robust circle fitting is proposed. During the iteration, Taubin's method is employed to obtain the center and radius. And then the geometric distances from the data points to the circle are computed, with which outliers are identified and removed. Numerical examples demonstrate that the proposed iterative procedure can alleviate the corrupted effect of outliers on the circle parameter estimates.     

The determination of the least distance to the strongly efficient frontier in Data Envelopment Analysis oriented models: Modelling and computational aspects

Determining the least distance to the efficient frontier for estimating technical inefficiency, with the consequent determination of closest targets, has been one of the relevant issues in recent Data Envelopment Analysis literature. This new paradigm contrasts with traditional approaches, which yield furthest targets. In this respect, some techniques have been proposed in order to implement the new paradigm. A group of these techniques is based on identifying all the efficient faces of the polyhedral production possibility set and, therefore, is associated with the resolution of a NP-hard problem. In contrast, a second group proposes different models and particular algorithms to solve the problem avoiding the explicit identification of all these faces. These techniques have been applied more or less successfully. Nonetheless, the new paradigm is still unsatisfactory and incomplete to a certain extent. One of these challenges is that related to measuring technical inefficiency in the context of oriented models, i.e., models that aim at changing inputs or outputs but not both. In this paper, we show that existing specific techniques for determining the least distance without identifying explicitly the frontier structure for graph measures, which change inputs and outputs at the same time, do not work for oriented models. Consequently, a new methodology for satisfactorily implementing these situations is proposed. Finally, the new approach is empirically checked by using a recent PISA database consisting of 902 schools.     

Covariate selection for accelerated failure time data

Selection of appropriate predictors for right censored time to event data is very often encountered by the practitioners. We consider the ?₁ penalized regression or “least absolute shrinkage and selection operator” as a tool for predictor selection in association with accelerated failure time model. The choice of the penalizing parameter λ is crucial to identify the correct set of covariates. In this paper, we propose an information theory-based method to choose λ under log-normal distribution. Furthermore, an efficient algorithm is discussed in the same context. The performance of the proposed λ and the algorithm is illustrated through simulation studies and a real data analysis. The convergence of the algorithm is also discussed.     

Disembodied politics: commitment and formal distance in Rancière*

Abstract

In light of the theme and concerns of the present collection of essays, we may ask whether ‘distance in general’, and ‘critical distance in particular’ (Fredric Jameson), has truly disappeared with postmodernity. Proposing an immediate and interruptive political engagement with local issues, Jacques Rancière’s articulation of political mobilisation does seem to confirm this claim. Upon further inspection, however, his emancipatory politics repeat the same mistake of valuing an abstract universal at the expense of a concrete particular, however paradoxical this may seem at first sight. The present article develops this thesis in three moments. On the first hand, it highlights Rancière’s notion of conflict as being institutive of politics. Secondly, it connects this ‘sensible’, and Rancière’s understanding of politics as being aesthetic, to Kant’s ‘Transcendental Aesthetics’. The French author sees in the leading section of the first Critique the grounding possibility of (I) freeing up time and space within the social realm; (II) the representation of a common political surface that can be reshaped; (III) political equality; (IV) emancipation. The last section shows how this recourse to the transcendental subject in Rancière’s politics follows and embraces a traditional position in the history of philosophy whereby identity is denigrated at the profit of a disembodied universalism.