中国上市公司投资者关系与公司治理——来自A股公司投资者关系调查的证据

论文考察了公司治理对投资者关系管理的影响作用.论文以南京大学投资者关系管理指数(CIRINJU)作为上市公司投资者关系管理水平度量指标.研究发现,机构投资者持股、外部股权的提高能有效促进公司提升投资者关系管理水平,管理层持股与投资者关系管理呈U型关系,董事长与CEO分离与投资者关系管理呈弱正相关关系,外部董事与投资者关系管理可能存在替代关系而不是互补关系.研究还发现,上市公司海外上市或发行B股能促进公司提升投资者关系管理水平,公司规模与投资者关系管理存在显著正相关关系,财务杠杆与投资者关系弱显著负相关,公司业绩与投资者关系管理存在内生性.     

大学生社交效能感量表的初步编制研究

本研究通过探索性因素分析抽取了大学生社交效能感量表的5个因素,分别是应对陌生人、社交信心、亲和力、社交主动、应对社交困境,再通过验证性因素分析检验,确定了量表五因素结构模型。通过信效度分析,表明量表具有较好的稳定性和有效性,达到了心理测量学的要求,可以用于大学生社交效能感状况的测量,为大学生社交效能感的进一步研究提供了研究工具。     

节制是立法者的美德——兼论立法理念的错位与变革

我国立法速度过快、数量过多以及立法所涉范围过广的问题,应当引起我们对由此可能导致的法律确定性、权威性的减损和法律实施困难等负面效应的警觉,以及对"法律万能论"、立法动机错位和立法权中心化的反思,并在此基础上,努力手求立法理念的转变与提升,扩大立法中的民主参与,鼓励并支持提高社会自治能力,以提高立法质量,遏制过快发展的立法活动.     

The Role of Emotions in Risk Communication

We present two experiments investigating the role of emotions concerning technological and natural hazards. In the first experiment, technological hazards aroused stronger emotions, and were considered to be riskier than natural hazards. No differences were found between the texts versus audio presentations. However, the presence of pictures aroused stronger emotions and increased the perceived risk. Emotions play a mediating role between hazard types and perceived risk, as well as between pictures and perceived risk. The second experiment adopted real‐world materials from webpages and TV. Emotions again play a mediating role between pictorial information and risk perception. Moreover, specific emotions were found to be associated with different types of action tendencies. For example, loss‐based emotions (e.g., fear, regret) tend to lead to prevention strategies, whereas ethical emotions (e.g., anger) lead to aggressive behavior. We also find that loss‐based emotions in the technical hazard scenario trigger more coping strategies (from prevention to retaliation) than in the natural hazard scenario.     

<红楼梦>:文化的寓言

《红楼梦》以一群“正邪两赋”的“人格”形象及其各种各样爱情的足迹，展现出一幅如诗如画的“玉堂金马红楼梦”中的生活画卷，从而以“滑稽”与“庄严”同在的宗教意识作为这一“生活”的“衰草枯杨好了歌”。“假语村言”敷衍出的一段故事，概括起的却是一部真实的文化史和一次审美意义上的文化批判，具有一种“文化结论”的意义，从而成为中国文化的一个“寓言”。     

Sequence Independent Lifting in Mixed Integer Programming

We investigate lifting, i.e., the process of taking a valid inequality for a polyhedron and extending it to a valid inequality in a higher dimensional space. Lifting is usually applied sequentially, that is, variables in a set are lifted one after the other. This may be computationally unattractive since it involves the solution of an optimization problem to compute a lifting coefficient for each variable. To relieve this computational burden, we study sequence independent lifting, which only involves the solution of one optimization problem. We show that if a certain lifting function is superadditive, then the lifting coefficients are independent of the lifting sequence. We introduce the idea of valid superadditive lifting functions to obtain good aproximations to maximum lifting. We apply these results to strengthen Balas' lifting theorem for cover inequalities and to produce lifted flow cover inequalities for a single node flow problem.     

用干涉滤波技术实现图象边缘增强

本文提出了用干涉及滤波技术实现图象边缘增强的一种新方法。将同一物体的一张正确对焦的透明片与另一张离焦的透明片重叠放在透镜的前面,在单色平行光照射下,在透镜的后焦面上得到两图象的谱的干涉,通过对干涉条纹的适当滤波,可在输出面得到边缘增强的象。     

Mixing and Matching the Green and Gold Roads to Open Access—Take 2

Three years ago, the Gold and Green Roads to Open Access were viewed as complementary strategies, with repositories having the potential of gradually behaving more like journals, and vice versa. Since then, repositories and journals have been progressing on parallel tracks. Re-examining the situation, the reasoning suggested in 2004 appears still valid. Simultaneously, a knowledge economy has made of science a strategic resource. The developing world is essentially invited to contribute to world science with little or no regard to the development of an autonomous scientific capacity. Open Access, in this context, takes a new meaning with one objective to help development of local and autonomous scientific capacity. However, to do so, mixing and matching repositories with journals is needed. Brazil exemplifies this type of development and shows how the Green and Gold roads can mix and match.     

A stochastic approximation algorithm for maximum-likelihood estimation with incomplete data

We propose a new stochastic approximation (SA) algorithm for maximum-likelihood estimation (MLE) in the incomplete-data setting. This algorithm is most useful for problems when the EM algorithm is not possible due to an intractable E-step or M-step. Compared to other algorithm that have been proposed for intractable EM problems, such as the MCEM algorithm of Wei and Tanner (1990), our proposed algorithm appears more generally applicable and efficient. The approach we adopt is inspired by the Robbins-Monro (1951) stochastic approximation procedure, and we show that the proposed algorithm can be used to solve some of the long-standing problems in computing an MLE with incomplete data. We prove that in general O(n) simulation steps are required in computing the MLE with the SA algorithm and O(n log n) simulation steps are required in computing the MLE using the MCEM and/or the MCNR algorithm, where n is the sample size of the observations. Examples include computing the MLE in the nonlinear error-in-variable model and nonlinear regression model with random effects.     

洋葱内表皮细胞骨架的显示及部分性质研究

本文利用洋葱内表皮细胞作为实验材料，观察细胞骨架结构．实验结果显示植物细胞骨架呈网状结构，分布在整个细胞质中；幼嫩细胞的细胞骨架比较密集，吸附较多蛋白质，须经多次洗涤后才可获得较为清晰的图片．进一步的研究表明，与幼嫩细胞的细胞骨架相比，衰老细胞的细胞骨架出现部分解聚的现象；幼嫩细胞的细胞骨架在低温条件下亦出现解聚现象．使用洋葱内表皮观察细胞的骨架结构为我们在简便、经济的条件下，通过普通光学显微镜观察骨架提供了可能．这种方法为今后进一步开展细胞骨架的功能研究奠定了基础．