企业内部网络、创新能力与知识转移——基于礼物交换理论视角

在对知识流、礼物交换、关系网络等研究进展情况进行梳理的基础上,展开了基于关系网络的知识转移促进创新的研究,探讨了网络关系建立与维系的根本原因,主要基于礼物交换理论,运用社会网络中的礼物交换现象和机理来解析知识转移的作用.     

The Tradition of Pioneer Hardships in American History Textbooks

Two middle-school teachers incorporated student creation of historical accounts into their history instruction. During these projects, the teachers instructed their students to (1) summarize information presented during classroom instruction on a topic (e.g., the Great Migration) and (2) explain the significance of that topic to the present day. This second component of the task addressed a curricular standard regarding historical thinking, but students' responses referenced themes from citizenship education (e.g., cultural pluralism, social criticism, and national identification). More than eighty student projects were analyzed and coded for themes. This study presents a portrait of ambitious history teaching and suggests a tactic for a civics-infused history education course.     

The Log-Normal zero-inflated cure regression model for labor time in an African obstetric population

In obstetrics and gynecology, knowledge about how women''s features are associated with childbirth is important. This leads to establishing guidelines and can help managers to describe the dynamics of pregnant women''s hospital stays. Then, time is a variable of great importance and can be described by survival models. An issue that should be considered in the modeling is the inclusion of women for whom the duration of labor cannot be observed due to fetal death, generating a proportion of times equal to zero. Additionally, another proportion of women''s time may be censored due to some intervention. The aim of this paper was to present the Log-Normal zero-inflated cure regression model and to evaluate likelihood-based parameter estimation by a simulation study. In general, the inference procedures showed a better performance for larger samples and low proportions of zero inflation and cure. To exemplify how this model can be an important tool for investigating the course of the childbirth process, we considered the Better Outcomes in Labor Difficulty project dataset and showed that parity and educational level are associated with the main outcomes. We acknowledge the World Health Organization for granting us permission to use the dataset.