浅析通信建设项目可行性研究报告中的经济评价

从通信建设项目的可行性研究报告是对拟建项目在决策前进行方案比较、技术经济论证的一种科学分析方法着手,论述了其中经济评价的重要性及它的两个层次——财务评价和国民经济评价的联系与区别,剖析了经济评价方法中存在的问题,并提出了相应的改进建议。     

论邓小平的宪政思想

邓小平的宪政思想对于现阶段我国的宪政建设具有重要的指导意义。宪法至上是邓小平宪政思想的前提,发展民主是邓小平宪政思想的核心原则,保障人权是邓小平宪政思想的目的。掌握并运用邓小平宪政思想的基本理论,对于我国目前正在进行的中国特色的宪政建设,具有不可忽视的重大意义。     

网络贸易中物流配送对包装设计的影响

分析了网络贸易中商品的销售和物流配送的特点,针对网络贸易中商品的物流上存在的问题,提出了对网上商品包装设计的重新定位。     

转型背景下中国企业战略研究:特征、方法及主题分析——基于英文文献的探讨

尽管转型经济下的中国企业战略管理日益成为国内外学者关注的前沿领域,但在这一领域国内外研究仍然缺乏有效的联系和沟通.对于国外学者已有的研究成果,我国战略研究学者至今还缺少全面认识和深入梳理.为了弥补这一缺憾,本文通过广泛搜集1978年至2008年30年间国际优秀期刊上发表的、研究转型经济下中国企业战略问题的英文文献,评价了其文献数量变化、期刊、学者和机构的贡献以及研究主题、研究理论基础、采用的研究方法及研究风格,提炼和分析了国外学者在中国企业战略研究中的成果和观点,最后对未来本土学者如何实现将研究与国际接轨、突出自身研究特色提出了相关看法和建议.     

汽车信息交换平台与行业集成供应链管理模式

本文简要介绍了基于中国汽车信息交换平台的汽车行业集成供应链管理模型,对其结构模型进行了分析,指出该管理模型对中国汽车工业发展将发挥重要作用.     

新环保法视角下环保NGO公益诉讼分析

2014年新修订的环保法赋予了环保NGO公益诉讼的主体资格,可以说是环境公益诉讼史上的一座里程碑。本文通过对近年来环保NGO参与环境公益诉讼面临问题及原因的分析,提出:由于新环保法相关条款的限制性规定、公益诉讼原告诉求保障不足、我国环保NGO自身能力较弱等原因,环保NGO在新环保法颁布后参与环境公益诉讼仍可能面临一定的阻力。应该完善新环保法相关公益诉讼条款、出台激励环保NGO参与环境公益诉讼的具体措施、加强环保NGO的能力建设,以促进新环保法的有效施行。     

Propensity score prediction for electronic healthcare databases using super learner and high-dimensional propensity score methods

ABSTRACT

The optimal learner for prediction modeling varies depending on the underlying data-generating distribution. Super Learner (SL) is a generic ensemble learning algorithm that uses cross-validation to select among a ‘library’ of candidate prediction models. While SL has been widely studied in a number of settings, it has not been thoroughly evaluated in large electronic healthcare databases that are common in pharmacoepidemiology and comparative effectiveness research. In this study, we applied and evaluated the performance of SL in its ability to predict the propensity score (PS), the conditional probability of treatment assignment given baseline covariates, using three electronic healthcare databases. We considered a library of algorithms that consisted of both nonparametric and parametric models. We also proposed a novel strategy for prediction modeling that combines SL with the high-dimensional propensity score (hdPS) variable selection algorithm. Predictive performance was assessed using three metrics: the negative log-likelihood, area under the curve (AUC), and time complexity. Results showed that the best individual algorithm, in terms of predictive performance, varied across datasets. The SL was able to adapt to the given dataset and optimize predictive performance relative to any individual learner. Combining the SL with the hdPS was the most consistent prediction method and may be promising for PS estimation and prediction modeling in electronic healthcare databases.     

Increasing Returns and Social Contagion in Cultural Industries

A formal definition of cultural industries is developed following four distinct features of cultural goods: (a) oversupply, (b) quality uncertainty, (c) network effects and (d) demand reversal. Drawing on economic and socio-psychological notions of ‘network’, increasing returns and social contagion effects are distinguished. Increasing returns may govern the adoption of standards when choices are binary, social contagion explains the diffusion of cultural goods when choices are multiple. Together, the four structural features delineating cultural industries account for curious competitive dynamics prevalent in cultural markets, such as the notorious 10 : 90 proportionality (under which 10% of cultural goods account for 90% of the market), causal ambiguity about the reasons for success, and the formation of fashions. Six managerial recommendations are advanced, focusing on a criticial circulation point triggering self-sustaining diffusion patterns. Finally ‘project-based enterprises’ and ‘network forms of governance’ are identified as the organizational forms most suited to the dynamics of the cultural markets.     

化工原理实验教学软件开发研究

使用“MicrosoftOfficeFrontPage”、“东方网页王”、“Java”、“主页秀3”等软件开发的《化工原理实验教学软件》每个教学单元包括文字、图片和影视三个部分,并都配有语音。该软件使用方便,内容丰富,并可以通过网络进行访问,几乎不受时空限制,极大地方便了化工原理实验课程的教与学。