On the Local Polynomial Estimators of the Counting Process Intensity Function and its Derivatives

Abstract. We consider the properties of the local polynomial estimators of a counting process intensity function and its derivatives. By expressing the local polynomial estimators in a kernel smoothing form via effective kernels, we show that the bias and variance of the estimators at boundary points are of the same magnitude as at interior points and therefore the local polynomial estimators in the context of intensity estimation also enjoy the automatic boundary correction property as they do in other contexts such as regression. The asymptotically optimal bandwidths and optimal kernel functions are obtained through the asymptotic expressions of the mean square error of the estimators. For practical purpose, we suggest an effective and easy‐to‐calculate data‐driven bandwidth selector. Simulation studies are carried out to assess the performance of the local polynomial estimators and the proposed bandwidth selector. The estimators and the bandwidth selector are applied to estimate the rate of aftershocks of the Sichuan earthquake and the rate of the Personal Emergency Link calls in Hong Kong.     

从自组织理论看社会的可持续发展

按照自组织理论,社会作为一个自组织系统,应在与自然之间相互开放的共生关系中求得其可持续发展;在平衡——非平衡——平衡的动态过程中保持其可持续发展;在竞争与协同的对立统一中促进其可持续发展;在涨与落的宏观效应中加速其可持续发展;在社会系统内部诸要素之间的非线性相互作用中实现其可持续发展。     

自动化社会与智能城市的未来——斯蒂格勒对列斐伏尔城市哲学的当代阐释与发展

通过审视当代法国激进左翼哲学家斯蒂格勒对智能技术时代都市空间生产状况的独创性哲学概念的阐释,为诊断当下都市空间的生产特征、权力机制及其矛盾后果提供镜鉴,亦试图激活列斐伏尔都市社会思想在全球数码化智能化时代的价值与未来潜能。斯蒂格勒为我们阐明了大数据的算法治理成为空间生产的权力技术机制,其后果将带来世界的普遍无产阶级化、身份危机与系统化愚蠢。斯蒂格勒的解决方案和未来理想是通过“贡献型城市经济”以寻求去自动化的智能城市与负熵化的逆人类纪的可能性。智能城市问题并非一个抽象的工程设计与城市规划的技术问题,而是一个都市社会差异的政治实践问题。城市生活的智能重塑,只能被合理地理解为都市新人类的新文明实践,将城市完全变成人类集体创造的作品。     

新型全自动打印机共享服务器的研制

分析了目前各种自动打印机共享器存在的不足，设计出一种新型的全自动打印机共享器，阐述了其特点和工作原理．     

深基坑工程设计与施工实例

某网壳结构采用落地拱形式,落地拱脚基础的基坑工程支护结构使用了钻孔灌注桩结合预应力锚杆的方式,降水采用深层搅拌桩止水帷幕和深井及井点降水相结合的形式.经过监测,基坑及周围建筑物稳定,保证了基础工程顺利施工.     

Is automatic enrollment consistent with a life cycle model?

We examine retirement saving for young adults in a life cycle model. We find that optimal retirement saving is zero for liquidity-constrained young adults who anticipate significant earnings growth. With a plausible age-earnings profile for college-educated workers, retirement saving does not begin until the late 30s or early 40s. Workers facing a flat earnings profile begin saving much sooner. Participating may be optimal for younger workers facing steep earnings profiles if they anticipate switching jobs and cashing out after 1–2 years. Our results suggest that automatically enrolling workers, regardless of age, is not consistent with a life cycle model.     

同轴度自动检测系统设计

介绍了同轴度自动检测的原理和实现方法。同轴度自动检测系统以微型计算机为基础，使待测零件圆周中采样点达72处。与手工测量相比提高了精度、减少了测量时间，具有较大的实用性。     

"自动控制原理"课程建设

总结了近50年来广东工业大学自动化学院进行"自动控制原理"课程建设所取得的成果,从教学内容更新、学生独立分析解决问题能力的提高、双语教学方式、教学条件完善、师资建设等方面进行了详细论述;最后凝练出"自动控制原理"课程建设已经形成的特色。     

电动汽车自动变速器设计研究

由于电池和电机技术的不成熟,电动汽车仍需利用变速器提高整车动力性和经济性。本文首先简述了常见自动变速器的结构原理和优缺点,结合电动汽车电机特性和双离合器自动变速器的优点,提出将两挡双离合器自动变速器应用于电动汽车,并着重对该自动变速器的系统结构原理及其实现过程进行介绍,并分析了该自动变速器的优点。经研究表明,两挡自动变速器具有较好的应用前景。     

Perfectionism,Anxiety, and Depressive Distress: Evidence for the Mediating Role of Negative Automatic Thoughts and Anxiety Sensitivity

Abstract

Objective: This study assessed a mediational model in which negative automatic thoughts and anxiety sensitivity were hypothesized to mediate the relationship between perfectionism cognitions and depressive and anxiety symptoms. Participants: Participants were undergraduate students from an urban Canadian university. The data were collected from July 2009 to August 2010. Methods: In a cross-sectional evaluation, 992 undergraduate participants completed questionnaires that assessed perfectionism cognitions, negative automatic thinking, anxiety sensitivity, and anxiety and depressive symptoms. Results: Mediational analysis confirmed the role of anxiety sensitivity and negative automatic thoughts in mediating the association between perfectionistic cognitions, anxiety symptoms, and depressive distress. Furthermore, in line with previous studies, nearly a third of students displayed an elevated prevalence of anxiety and depressive symptoms. Conclusions: This study further clarified the associations and mediating relationships among mood states associated with perfectionism.