兰登书屋数字化发展研究

通过分析兰登书屋日渐成熟的电子书、有声书经营以及跨媒体出版方式,总结它在实现出版全球化过程中的宝贵经验。面对出版全球化、数字化的浪潮,享誉世界的大众图书出版商兰登书屋在运用数字手段拓展、巩固海外市场方面取得了骄人的成绩。它的数字化发展道路对我国出版业具有一定借鉴意义。     

Uncertain educational returns in a developing economy

This paper estimates the distribution of educational returns by gender for India. While previous studies focus on mean returns, the variance of educational returns has important implications for policy-making and micro-level decision making with respect to education. If the variance of educational returns is large, it can leave large sections of the population with negative returns; if the variance of educational returns is gender specific, it can influence households’ decisions to educate girls versus boys. Our econometric results provide evidence that India's labor markets are characterized by significant uncertainty and that the uncertainty is systematically larger for women.     

显式评分的重启动随机游走推荐算法研究

针对目前重启动随机游走推荐算法偏重隐式评分而忽略显式评分的问题,采用监督重启动随机游走算法,使得用户喜爱的项目被访问的概率大于用户不喜爱的项目的概率,从而做出推荐。实验表明,该算法可以有效地提高推荐的准确性。     

随机变量的分布函数求解方法的讨论

结合实例归纳了求离散型、连续型、特殊型三种随机变量的分布函数求法,使问题易于理解,计算更为简便。并对这三种随机变量的分布函数进行了对比,讨论了其本质、表达形式等方面的异同。     

基于假设间隔的弱随机特征子空间生成算法

集成算法是机器学习领域的研究热点。随机子空间算法是集成算法的一个主要算法。随机子空间生成的特征子集可能含有冗余特征、噪声特征,影响算法的分类精度。为此,本文提出了一种基于假设间隔的弱随机特征子空间生成算法（WRSSimba）,有效去除了特征子集中冗余特征和噪声特征。在UCI数据集上的实验结果表明,WRSSimba的分类性能优于随机子空间算法和Simba算法。     

基于节点可信度的无线Mesh网络信道分配策略

目前很多无线Mesh网络（WMN）是以多信道、多接口环境搭建,如何进行有效的信道分配来提高网络性能是无线Mesh网络研究的重点之一.综合考虑了网络链路负载、节点可信度和链路干扰等因素,提出了一种基于节点可信度的无线Mesh网络信道分配策略（NTCA）对重要链路优先分配信道,从而降低链路冲突率.通过实验仿真表明,与随机信道分配策略相比,NTCA策略能有效降低网络冲突,提高网络性能.     

基于随机对照试验的小儿支原体肺炎中医药治疗研究述评

根据我国中医药治疗小儿支原体肺炎的现状和存在的问题,对我国中医药治疗小儿支原体肺炎的随机对照试验文献的质量和内容进行了评价和分析,以期进一步提高小儿支原体肺类的中医药临床治疗水平。     

Attitudes about publishing and normal science advancement

The objective of this work was to examine the relationship between attitudes about publishing across disciplines and the scientific impact of authors. We conducted a web survey of 1066 authors randomly selected from four disciplines in the Web of Knowledge: economics, anthropology, water resources and biochemistry (approximately 250 from each discipline). Authors were asked questions about publishing norms within their discipline. The h-index of authors was subsequently calculated from data available from the Web of Knowledge. Authors in biochemistry had on average twice the h-index of those in economics, anthropology and water resources. Biochemists had higher expectations about the number of articles published for hire and promotion, more strongly valued interdisciplinary publishing, felt the cutting edge of their science was clearer, and had more defined patterns of author credit assignment than the other disciplines. Anthropologists exhibited a lower relationship between h-index and the number of years since their first publication. We conclude that attitudinal differences between disciplines may lead to differences in the recognition of scientific findings and the therefore the establishment of normal science.     

Meta-Analysis of Meta-Analyses in Communication: Comparing Fixed Effects and Random Effects Analysis Models

Thirty-nine meta-analyses obtained from the past 10 years of communication research (1997–2007) were reanalyzed using fixed effects (FE), random effects (RE), and Hunter and Schmidt (HS) meta-analytic methods. The majority of studies (62%) reported use of the HS model in the original analysis. Differences identified between models include (a) greater propensity for Type 1 error under the FE approach, (b) episodes of inflated effect size (ES) under the RE approach, and (c) high levels of heterogeneity in population ESs across studies. Recommendations are made for scholars to appropriately choose and implement meta-analytic models in future research.     

试论军事任职教育院校情报教育的创新发展

情报素质是军事指挥人才必备的基本素质之一,在军校开展情报教育是提高军校学员情报素质的主要手段.在军校由学历教育向任职教育的转型过程中,情报教育遇到了新的挑战.图书馆必须在教育时间的安排、教育内容的设计、教育形式的创新以及教育合力的形成等方面加以创新,才能实现军事任职教育院校情报教育的可持续发展.