中国流通产业技术装备度:基于因子综合的水平定位与结构考察

文章基于对流通产业技术装备问题的前期研究,依托我国流通产业技术装备层面的既存统计数据,借助因子分析法构建了流通产业技术装备度评价模型,实现了对流通产业技术装备从规模、效率、密度、发展和产出五个角度的分项评价以及对"流通产业技术装备度"的综合评价。文章一方面为评价不同时期、不同地域、不同类别的流通产业技术装备水平开创了动态、开放的方法体系;另一方面对我国流通产业技术装备化演进过程以及我国不同省份和地区流通产业技术装备发展水平的结构特征进行了实证考察,为认识我国流通产业技术装备的演进现状、发育水平、存在问题以及发展重点提供了翔实的依据。     

《死者》的语言特色探析

《死者》是詹姆斯·乔伊斯短篇小说集《都柏林人》的压卷之作。其语言结构独特 ,文采飞扬 ,重复修辞手法显而易见 ,并不泛对偶、排比等 ,给读者带来强烈的视觉冲击。     

Stable many-to-many matchings with contracts

We consider several notions of setwise stability for many-to-many matching markets with contracts and provide an analysis of the relations between the resulting sets of stable allocations for general, substitutable, and strongly substitutable preferences. Apart from obtaining “set inclusion results” on all three domains, we introduce weak setwise stability as a new stability concept and prove that for substitutable preferences the set of pairwise stable matchings is nonempty and coincides with the set of weakly setwise stable matchings. For strongly substitutable preferences the set of pairwise stable matchings coincides with the set of setwise stable matchings.     

快速消费品营销特点比较分析

快速消费品面临的竞争压力,一个品牌要持久,实际是以不断推陈出新为特点的,这要是在营销竞争中保持竞争优势的重点,文章通过对快速消费品与耐用消费品的比较,对快速消费品的营销特点作了分析和探讨。     

河北省民营科技企业发展态势及特征分析

基于1999年～2007年的数据,对河北省民营科技企业的发展状况进行了系统的分析。研究发现,这一时期,河北省民营科技企业无论从数量、规模。还是在效益、创汇能力等方面都得到了迅速发展;在发展过程中,虽然民营科技企业从事的行业仍以河北省的传统优势领域为主,但科技园区规模效应逐步显现,现代企业制度逐步建立。然而,纵观其发展历程,仍然面临着诸如地区间发展极不平衡、科技队伍发展缓慢、科技投入不足、研发能力较低、融资渠道狭窄等亟待解决的严峻问题。     

空间差异度量约束的图像修复

针对传统算法在图像修复时选取最佳块匹配准则的单一性和随机性的问题,提出了一种空间差异度量约束的图像修复方法。该算法利用等照度线确定待修复块的优先级,根据空间差异度量约束的最佳块匹配准则搜索与该待修复块最匹配的样本块,采用最佳匹配块的信息更新优先级最高的待修复块的信息以修复其缺失像素信息。实验结果表明,与传统算法相比,所提算法能有效提高图像修复的主客观质量,对三种类型的信息缺失均取得了较好的修复效果。     

The impact of household life‐cycle stages on subjective well‐being: Considering the effect of household expenditures in Hungary

The household life‐cycle stage is a significant contributor to the perception of subjective well‐being; however, the effect of household expenditures of life‐cycles on subjective well‐being has not been thoroughly explored. The life‐course perspective, specifically the study of family/household life‐cycles, emphasizes the understanding of subjective well‐being across the entire life‐span. Accordingly, in the literature subjective well‐being is often studied at different life‐stages considering the influence of variables such as age, cohabitation and fertility. The present study evaluates the level of subjective well‐being across the various life‐cycle stages using a matching method on a Hungarian national sample. This approach is appropriate for studies using observational data because the administration of a true experimental design is usually not feasible for this type of research. The main finding of the article is that controlling for the expenditure structure significantly modifies the effect of life‐cycle on subjective well‐being, which is varied across life‐cycle stages and shown to be highly dependent on household expenditures.     

Does the Use of Mobile Phones by Smallholder Maize Farmers Affect Productivity in Ghana?

ABSTRACT

This study evaluates the effects of mobile technology on productivity and the channels of transmission of these effects. Using propensity score matching procedures, the results show that mobile phone ownership and use significantly improves agricultural productivity. Specifically, the mobile phone improves the productivity of user-farmers by at least 261.20 kg/ha per production season. Further, we find that phone ownership and use impacts productivity more than phone use only. The identified channels of effect are extension services, adoption of modern technology and market participation. These results have key policy implications for Ghana and developing economies at large.     

Matching public support for private product-innovating R&D: a theoretical analysis

This paper develops a theoretical model of product innovation where research and development (R&D) effort by a monopolist firm is endogenous and its outcome uncertain. The government attempts to aid such efforts with a matching grant. We consider different scenarios depending on whether two parties act simultaneously, act sequentially, or take part in a dynamic cooperative game with a trigger strategy. We also consider cases (i) when the products are exported, (ii) when the firm lobbies for R&D subsidy, and (iii) when the firm is foreign owned. We characterize situations when government intervention increases the chances of product innovation and when it does not.     

微博网络中基于主题发现的舆情分析

针对现有微博网络舆情分析的研究中没有从全局层面考虑舆情文本特征的情况,结合微博网络舆情的主题及趋向性分析,提出了基于主题发现的微博网络舆情分析模型,从文本预处理、微博文本特征提取、微博舆情的主题发现及趋向性分析三方面进行了具体描述。仿真结果表明,基于该模型实现的微博网络舆情分析方法在微博网络舆情的分析处理中检测效果良好,说明该模型有效。相关内容可为该领域的进一步研究提供有价值的参考。