家庭农场发展的多重动力机制分析

基于政府、市场和农民家庭的综合分析视角,考察了家庭农场兴起的过程,系统揭示了家庭农场发展的多重动力机制。研究发现：政府推动农业规模经营的政策实践及市场化条件下农业规模效益的增长,构成为家庭农场发展的两个重要外部动力。但家庭农场的兴起和发展更是农民家庭借助政府和市场等外部条件变化,不断调整和优化其家庭劳动力的配置方式,从而最大化家庭收入以不断满足日益增长的家庭消费需求的结果。农民家庭构成为家庭农场发展的内在动力。家庭农场是农民家庭同政府和市场“互构”的结果,这也充分显示出了农民家庭经济组织的发展活力和发展前景,形塑了我国小规模农业的独特发展道路。     

“鲁迅形象”建构的文化语境、过程与反思

"鲁迅形象"是中国现代文化史上典型的现代知识分子的形象符码,其生成过程与现代中国的动态语境密切相关,深刻地勾联了阐释者的文化心理和思维形态。"鲁迅形象"是由自塑和他塑合力而构成的公共形象,对其进行文化学意义上的考察可为探索现代中国发展的社会史和现代知识分子的心灵史提供理论资源。     

出口二元边际、行业异质性与劳动生产率

基于行业异质性视角,文章主要考察出口二元边际对劳动生产率的影响.利用UN Comtrade数据库,采用HK指数法测度中国出口深度边际和出口广度边际,发现中国出口产品种类基本覆盖了世界全部种类的90％.进一步地,借助聚类分析方法综合多种因素区分行业劳动技能异质性,出口二元边际与劳动生产率关系的实证结果显示:总体上出口深度边际显著推动劳动生产率提高,出口广度边际对劳动生产率产生抑制作用.更为重要的是,出口深度边际对劳动生产率的促进作用仅存在于高技能行业,受限于行业产品技术含量和劳动技能水平等,低技能和中等技能行业出口深度边际出现贫困化增长现象.出口种类扩张的生产率损失超过出口溢出效应的生产率收益,出口广度边际对高中低技能行业劳动生产率具有不同程度的负向影响.     

An empirical Bayes' procedure for ranking players in Ryder Cup golf

We describe a model to obtain strengths and rankings of players appearing in golf's Ryder Cup. Obtaining rankings is complicated because of two reasons. First, competitors do not compete on an equal number of occasions, with some competitors appearing too infrequently for their ranking to be estimated with any degree of certainty, and second, different competitors experience different levels of volatility in results. Our approach is to assume the competitor strengths are drawn from some common distribution. For small numbers of competitors, as is the case here, we fit the model using Monte-Carlo integration. Results suggest there is very little difference between the top performing players, though Scotland's Colin Montgomerie is estimated as the strongest Ryder Cup player.     

商誉和价格影响需求的易逝品动态定价与广告决策

研究需求受价格和商誉共同影响下易逝品动态定价与广告投资策略的联合决策问题。在初始库存确定的情形下,在某待定销售周期内,企业通过投入广告提升自身商誉从而拓宽市场,以企业利润最大化为目标,建立联合最优动态定价及广告投资策略模型。应用庞特里亚金极大值原理,求得不同系统参数下最优动态定价和广告投资策略及最优的销售周期。通过数值算例验证方法的有效性,结合参数灵敏度分析检验系统参数对最优策略的影响并给出相应管理意义。     

Generalized Kerridge’s inaccuracy measure for conditionally specified models

Recently, conditional Renyi’s divergence of order α and Kerridge’s inaccuracy measures are studied by Navarro et al. (2014 Navarro, J., Sunoj, S.M., Linu, M.N. (2014). Characterizations of bivariate models using some dynamic conditional information divergence measures. Commun. Stat. Theory Methods 43:1939–1948.[Taylor &; Francis Online], [Web of Science ®] , [Google Scholar]). In the present article, a generalized dynamic conditional Kerridge’s inaccuracy measure is introduced, which can be represented as the sum of conditional Renyi’s divergence and Renyi’s entropy. Some useful bounds are obtained using the concept of likelihood ratio order. The results are extended to weighted distributions. Sufficient conditions are obtained for the monotonicity of the proposed measure. Characterizations for bivariate exponential conditional distribution are presented based on the proposed measure.     

切线模量法确定强夯地基承载力的现场试验研究

平板载荷试验是检验强夯加固填土地基承载力的重要手段，基于平板载荷试验的切线模量法以安全系数和允许沉降两个控制因素结合Terzaghi极限承载力理论可计算不同沉降要求的地基承载力。为了验证切线模量法计算强夯地基承载力的可行性和优越性，对现场填土地基进行强夯加固后进行平板载荷试验和超重型动力触探试验，以三组[WTBX]平板载荷试验9个试验点的测试结果为基础，反演该地基土性参数并通过切线模量法绘制p s曲线，发现切线模量法计算的p s曲线与现场p s曲线能够很好的吻合，故可用切线模量法计算基础中心不同沉降量所对应的地基承载力,且能够弥补平板载荷试验和动力触探测试方法的不足，故为浅基础的设计提供了一条新的途径。     

网络购物中的社会诚信问题研究——基于不完美信息动态博弈理论

将一次网络交易抽象为不完美信息动态博弈模型，通过对买卖双方博弈行为的分析，得出网络交易纠纷频发的原因。并通过对模型进一步扩展，分析当前网络交易规则存在的缺陷，针对其中的问题，提出提高市场效率的建议。     

Semi-parametric segmentation of multiple series using a DP-Lasso strategy

We consider a semi-parametric approach to perform the joint segmentation of multiple series sharing a common functional part. We propose an iterative procedure based on Dynamic Programming for the segmentation part and Lasso estimators for the functional part. Our Lasso procedure, based on the dictionary approach, allows us to both estimate smooth functions and functions with local irregularity, which permits more flexibility than previous proposed methods. This yields to a better estimation of the functional part and improvements in the segmentation. The performance of our method is assessed using simulated data and real data from agriculture and geodetic studies. Our estimation procedure results to be a reliable tool to detect changes and to obtain an interpretable estimation of the functional part of the model in terms of known functions.