基于感知价值和参考群体的低碳旅游参与意愿测度与模拟路径

随着旅游者环境意识的不断增强,人们的消费行为对环境产生的影响也越来越受到关注。从低碳旅游感知价值和参考群体的影响作用出发,构建"90后"低碳旅游参与意愿的结构方程模型,并进行了假设的验证。研究结果表明:情感价值和社会价值对"90后"低碳旅游参与意愿具有显著的正向影响,而功能价值对这个年龄群体的低碳旅游参与意愿的显著正向影响在本文中未得到验证;主要参考群体(父母、亲戚)和次要参考群体(同学、朋友)虽然对"90后"低碳旅游参与意愿都正向影响显著,但次要参考群体的影响程度要高于主要参考群体的。研究认为,"90后"正不断成为消费的新生力量,在这个消费群体中推广低碳旅游得到的效用很重要,这种效用是从感知质量和期望绩效比较中以及短期和长期感知成本的降低中得到的。此外,发挥同学朋友的参考群体作用,也可以提高此类人群的低碳旅游参与意愿。     

生产率与企业出口--基于辽宁省工业企业微观数据的实证研究

近期部分学者发现的中国企业出口“生产率悖论”问题,可能是加工贸易比重过高导致的。为此文章选择加工贸易比重较低的辽宁省作为检验对象,对2003～2008年间持续存在的2644家规模以上制造业企业数据进行面板数据分析,发现“生产率悖论”在该地区并不存在,高生产率是企业出口的决定因素,同时所有制性质、企业规模、市场进入成本等也会影响出口。针对人均利润、人均应收账款等方面的对比还发现,国内信用制度较差、交易成本过高也可能导致了中国企业“被迫出口”。     

论英汉笔译课堂教学信息化的技术手段

本文结合国内高校英汉笔译教学的实际情况,讨论如何通过现有的技术手段在英汉笔译课堂上实现信息化教学,让课堂教学真正反映就业市场上笔译工作的实践特征,从而让现代教育技术更好地服务于笔译课堂教学,提高英汉笔译的教学效果。     

The Attributes of Effective NGOs and the Leadership Values Associated with a Reputation for Organizational Effectiveness

Building on prior research characterizing organizational effectiveness as a social construction, this article identifies the perceived attributes of effective transnational nongovernmental organizations (NGOs) and the leadership values associated with higher reputations for organizational effectiveness. Results are based on an in‐depth, mixed‐method interview study of 152 NGO leaders located in the United States and representing all major sectors of organizational activity. Among the twenty‐nine attributes that leaders identified in peer organizations that they regarded as particularly effective, leaders stressed instantiation of sound principles or strategy, a grassroots approach, large organizational size and resources, being collaborative, singleness of focus, campaigning abilities, funding and fundraising prowess, global scope, and quality people. Furthermore, statistical analysis reveals that NGOs with leaders who value similarities with peer organizations, grassroots approaches, diversity of strategies, dedication, professionalism, and distributed organizational structures have significantly higher reputations for effectiveness.     

群体性事件网络助燃作用研究

关系复杂化、媒体迎合化、网民偏激化是群体性事件网络助燃的主要因素;数量逻辑、见证逻辑、损害逻辑是群体性事件网络助燃的主要逻辑;“倒置”式、“闪爆”式、“混搭”式是群体性事件网络助燃的主要模式。依法治理网络谣言、重塑媒体责任担当、引导网络舆论推进改革是群体性事件网络阻燃的可行机制。     

我国科学方法教学的传统反思及研究展望

我国科学方法教学的传统存在描述方式粗线条化以及教育内容的知识决定论倾向。科学方法教育的心理学基础包括皮亚杰的认知结构理论和信息加工心理学。科学方法教育的科学哲学基础是一种科学的结构观,其中布鲁纳和施瓦布有不同的观点。基于历史与哲学的视角,科学方法的特征被概括为主体性、客观性、试探性和历史性。科学方法教育发展的进路包括科学方法教学心理学的深入研究、科学方法课程内容的进阶研究、科学方法教学方式的逻辑研究、科学方法教育理论的系统研究、物理科学方法的科学教育哲学研究。     

供应链应收账款融资信用风险评价

为区别于传统流动资产授信评价,在考虑供应链整体状况的基础上,对供应链融资模式中的应收账款融资信用风险的特征进行识别,构建供应链应收账款融资的信用风险评价指标体系。利用ANP法考虑各指标之间的依存和反馈关系,使用super decision软件计算得出各指标ANP权重,然后结合灰色综合评价法,对供应链应收账款融资的信用风险进行量化。     

An online copy number variant detection method for short sequencing reads

The availability of the next generation sequencing (NGS) technology in today's biomedical research has provided new opportunities in scientific discovery of genetic information. The high-throughput NGS technology, especially DNA-seq, is particularly useful in profiling a genome for the analysis of DNA copy number variants (CNVs). The read count (RC) data resulting from NGS technology are massive and information rich. How to exploit the RC data for accurate CNV detection has become a computational and statistical challenge. We provide a statistical online change point method to help detect CNVs in the sequencing RC data in this paper. This method uses the idea of online searching for change point (or breakpoint) with a Markov chain assumption on the breakpoints loci and an iterative computing process via a Bayesian framework. We illustrate that an online change-point detection method is particularly suitable for identifying CNVs in the RC data. The algorithm is applied to the publicly available NCI-H2347 lung cancer cell line sequencing reads data for locating the breakpoints. Extensive simulation studies have been carried out and results show the good behavior of the proposed algorithm. The algorithm is implemented in R and the codes are available upon request.     

Threshold‐free estimation of functional antibody titers of a group B streptococcus opsonophagocytic killing assay

Opsonophagocytic killing assays (OPKA) are routinely used for the quantification of bactericidal antibodies in blood serum samples. Quantification of the OPKA readout, the titer, provides the basis for the statistical analysis of vaccine clinical trials having functional immune response endpoints. Traditional OPKA titers are defined as the maximum serum dilution yielding a predefined bacterial killing threshold value, and they are estimated by fitting a dose‐response model to the dilution‐killing curve. This paper illustrates a novel definition of titer, the threshold‐free titer, which preserves biological interpretability while not depending on any killing threshold or on a postulated shape of the dose‐response curve. These titers are shown to be more precise than the traditional threshold‐based titers when using simulated and experimental group B streptococcus OPKA experimental data. Also, titer linearity is shown to be not measurable when using threshold‐based titers, whereas it becomes measurable using threshold‐free titers. The biological interpretability and operational characteristics demonstrated here indicate that threshold‐free titers are an appropriate tool for the routine analysis of OPKA data. Copyright © 2015 John Wiley & Sons, Ltd.     

Approximating moments of continuous functions of random variables using Bernstein polynomials

Bernstein polynomials have many interesting properties. In statistics, they were mainly used to estimate density functions and regression relationships. The main objective of this paper is to promote further use of Bernstein polynomials in statistics. This includes (1) providing a high-level approximation of the moments of a continuous function $g\left(X\right)$ of a random variable $X$, and (2) proving Jensen’s inequality concerning a convex function without requiring second differentiability of the function. The approximation in (1) is demonstrated to be quite superior to the delta method, which is used to approximate the variance of $g\left(X\right)$ with the added assumption of differentiability of the function. Two numerical examples are given to illustrate the application of the proposed methodology in (1).