一类二阶变系数微分方程的解

通过变量变换 ,将变系数线性常微分方程化为常系数线性常微分方程 ,再利用常数变易法给出了一类二阶变系数非齐线性微分方程的通解。     

Land Ownership as a Determinant of Temporary Migration in Nang Rong, Thailand

In this study I consider landownership as a determinant of temporary migrationin a rural area of Thailand. Previous researchon rural areas in developing countries hasfocused on the use of migration to diversifyhousehold incomes across economic sectors andacross geographic areas. I combine thisliterature with economic theories of migrationto understand the effect of land ownership ontemporary migration of household members inNang Rong, Thailand. I estimate regressionmodels predicting the probability of ahousehold having any temporary migrants, andpredicting the number of male or femaletemporary migrants in the household. I findthat households with smaller landholdings arediversifying through migration in order tosupplement rural income, while households withlarger landholdings are diversifying in orderto overcome the absence of accessible credit inthe village.     

Cultural Variables and International Business

IntroductionCulturegivesanindividualananchoringpoint,ani dentity ,aswellascodesofconduct (MichaelR ,Iikka ,andMichaelH 2 0 0 2 :33) .Ofmorethan 16 0definitionsofculture (AlfredandClyde 1985 :11) ,mostagreeonsomebasicprinciples ,butthereisalotofvariationonthedetails .Cultureisalsomultidimensional ,consistingofanumberofcommonelementsthatareinterdependent.Thedifferencesinculturehaveanimportantimpactonmanyaspectsofamultinationalcompany’sactivity .Thispaperwillmainlydiscusstheeffectofsomeofthe…     

Sampling design proportional to order statistic of auxiliary variable

The sampling designs dependent on sample moments of auxiliary variables are well known. Lahiri (Bull Int Stat Inst 33:133–140, 1951) considered a sampling design proportionate to a sample mean of an auxiliary variable. Sing and Srivastava (Biometrika 67(1):205–209, 1980) proposed the sampling design proportionate to a sample variance while Wywiał (J Indian Stat Assoc 37:73–87, 1999) a sampling design proportionate to a sample generalized variance of auxiliary variables. Some other sampling designs dependent on moments of an auxiliary variable were considered e.g. in Wywiał (Some contributions to multivariate methods in, survey sampling. Katowice University of Economics, Katowice, 2003a); Stat Transit 4(5):779–798, 2000) where accuracy of some sampling strategies were compared, too.These sampling designs cannot be useful in the case when there are some censored observations of the auxiliary variable. Moreover, they can be much too sensitive to outliers observations. In these cases the sampling design proportionate to the order statistic of an auxiliary variable can be more useful. That is why such an unequal probability sampling design is proposed here. Its particular cases as well as its conditional version are considered, too. The sampling scheme implementing this sampling design is proposed. The inclusion probabilities of the first and second orders were evaluated. The well known Horvitz–Thompson estimator is taken into account. A ratio estimator dependent on an order statistic is constructed. It is similar to the well known ratio estimator based on the population and sample means. Moreover, it is an unbiased estimator of the population mean when the sample is drawn according to the proposed sampling design dependent on the appropriate order statistic.     

当前影响和制约中国电子商务进一步发展的几个问题

当前，影响和制约中国电子商务进一步发展的主要问题集中表现在“信用缺失”问题上，它导致人们对网上交易仍心存疑虑，物流配送滞后，商品流通不畅，企业计算机应用水平不高，高水平网络人才匮乏，与电子商务相关的法规体制不够健全。为此，中国电子商务必须建立诚信长效机制，加快物流配送体系建设，构筑有效的社会物流配送系统．加快推广电子商务知识，强化电子商务人才培养，健全与国际接轨的电子商务法律体系。     

物流的定义及其他——与王槐林、刘明菲先生商榷

物流的定义多种多样,林林总总,但都没有把生产过程包括到物流的活动中,只有王槐林、刘明菲先生主编的《物流管理学》却把生产活动当作物流的重要内容之一,并概括在物流的定义之中。这种观点如果成立,将给有关理论和实践造成很大混乱。     

谈变动成本法的应用

就变动成本法与财务成本核算实现合二为一核算体制———实行单轨核算,进行研究,提出一套行之有效的核算办法,这将有利于企业责任成本的落实和实施,减轻会计人员的工作量;有利于企业生产经营的短期预决策,提高应对市场的快速反映能力。     

文旅融合背景下海派传统工艺美术IP资源开发策略研究

传统工艺美术IP资源开发是激活文旅产业的密钥,亦是推动非遗文化由资源变资产、遗产变财产的产业化发展重要途径。文旅融合背景下海派传统工艺美术IP资源开发可以从产业融合、交流融合、服务融合、空间融合四个维度进行：一是继续开发开放海派传统工艺美术IP资源,协同推动文旅产业深度融合发展。二是用好用活“节、赛、会”资源,加快推进长三角“非遗+旅游”交流融合。三是积极推动数字新基建建设,构建海派非遗文旅融合生态服务体系。四是坚持功能提升,增加城乡区域文化辐射力,推动海派非遗文旅空间融合。     

湖北自贸试验区的制度创新:实践特征、理论内涵与政策启示

建设湖北自贸试验区是新发展阶段全面深化改革、扩大开放的系统性探索和战略实践,从动态演进论与制度变迁、制度经济学的交易成本论以及公共经济学的公共物品供需视角,对自贸试验区制度创新的理论逻辑与实践意义予以系统研究。研究发现,湖北自贸试验区围绕加快转变政府职能、深化投资领域改革、促进贸易转型升级、推动金融开放创新、创新驱动发展以及服务国家战略等方面展开了一系列制度创新实践,逐步形成由浅入深、由线下向线上线下协同发展、由共性领域向特色领域逐步延伸、从前项到末端统筹安排、借鉴与创新并举以及集中推广与自主运用相结合的改革创新发展路径。研究认为,推动湖北自贸试验区的制度创新,充分发挥其在破解地方深层次结构性发展矛盾和扩展增长赋能空间上的功能内涵,需要在顶层制度设计方面,加强与国内国际双循环新发展格局相互衔接,通过完善监管体系设计、提升行政服务效率来转变政府监管职能和健全市场监管,构建由法律法规、行政规章、规范性文件共同组成的、与国际规范兼容协调的法制框架和政策体系,统筹为国家试制度、出经验的全局性战略目标与谋求为地区经济发展注活力、添动力的局部性现实需求之间的激励导向; 在具体实施路径层面,持续优化开放平台、营商环境和加强口岸智慧功能建设,着力培育和强化大城市、大枢纽、大口岸、大平台、大产业以及一流的营商环境等,构建开放型经济新体制和多维量化评估指标体系,实现自贸试验区制度创新实践探索、经验成效审视验证、赋能社会经济发展以及长远建设规划目标的有机协调统一,助力湖北建设新时代内陆开放新高地。     

语言多属性决策的目标规划模型

研究了只有部分属性权重信息、属性值以语言变量或不确定语言变量形式给出且决策者对方案有偏好信息的语言多属性决策问题.给出了语言变量和不确定语言变量的运算法则,以及不确定语言变量之间比较的可能度公式,定义了语言变量的偏离度概念.在属性值以1)语言变量和2)不确定语言变量,这两种形式给出的情形下,分别建立了一个基于偏离度的目标规划模型,并通过求解这两种模型分别获得相应的属性权重.然后对于情形1),利用语言加权平均(LWA)算子,对语言决策信息进行加权集成,继而对方案进行排序和择优;对于情形2),利用不确定语言加权平均(ULWA)算子,对不确定语言决策信息进行加权集成,并利用可能度公式构造可能度矩阵(互补判断矩阵),继而利用互补判断矩阵排序公式对决策方案进行排序和择优.最后进行了实例分析.