南阳香菇代料春栽技术探析

南阳西部山区及周边地区菇农在香菇代料栽培生产实践中 ,探索出了“双棚、中 (小 )袋、立体层架、春季栽培”法 ,管理上首创“不脱袋转色”、“带袋全光育花”技术。这种生产管理模式称之谓香菇代料栽培生产的“南阳模式”。     

企业发展过程中的成功要素结构变迁——韩国三星企业集团成功之道

企业发展壮大的关键在于 :企业能够在发展的过程中动态调整企业系统的 7S成功要素组合 ,以适应经营环境变化。本文提出了一个企业发展 5阶段与 7S成功要素匹配的理论结构 ,并就三星企业的发展史做了实证研究     

信息时代期刊编辑角色与编辑模式的转变

分析了信息技术使期刊在信息载体、信息传递形式与速率、期刊出版等方面形成的新的特点.审视了信息时代编辑工作的性质和特征,认为高效率与高智能、主动性与创造性是其最突出的表现.现代编辑角色的内涵与外延将会有所改变,编辑还须学习兼任"信息导航员"、"论坛主持人"等其他角色.旧的编辑工作模式将发生根本性的转变,多媒体编辑系统使编辑方式具有明显的多层面的立体式特征,程序编辑中心将使撰稿、审编、检索,甚至出版、发行实现一体化.随着出版现代化、国际化的进一步发展,期刊编辑在完善纸品期刊的同时,还必须注重转向电子刊物、网络刊物的发展.     

试析我国房地产投资运作模式及其发展

随着我国房地产市场由卖方市场逐渐过渡到买方市场,房地产投资运作模式由作坊生产式投资模式逐渐向社会化大生产式投资模式椎进。     

农地流转制度应坚持的原则及处理好的关系

以科学发展观为指导,围绕党的十七届三中全会提出的具体方针,在论证完善统筹城乡发展要求下农地流转制度的必要性和可行性的基础上,探索完善统筹城乡发展要求下农地流转制度应坚持以党的路线、方针、政策和国家的法律法规为基石,维护农民利益,以及灵活性、发展性等原则,正确处理好农地用途转移与严格保护、合理利用农地,农地流转与失地农民,统筹城乡与农地流转三个关系。     

基于人工神经网络的国家新建粮库运营绩效评价方法研究

国家新建粮食储备库运营绩效的评价应从这一概念的内涵出发,建立运营绩效评价的多层次指标体系,把人工神经网络作为评价理论依据.提出了评价的基本思路,构建了评价的反向误差传播(BP)模型.     

Fast and Accurate Inference for the Smoothing Parameter in Semiparametric Models

A fast and accurate method of confidence interval construction for the smoothing parameter in penalised spline and partially linear models is proposed. The method is akin to a parametric percentile bootstrap where Monte Carlo simulation is replaced by saddlepoint approximation, and can therefore be viewed as an approximate bootstrap. It is applicable in a quite general setting, requiring only that the underlying estimator be the root of an estimating equation that is a quadratic form in normal random variables. This is the case under a variety of optimality criteria such as those commonly denoted by maximum likelihood (ML), restricted ML (REML), generalized cross validation (GCV) and Akaike's information criteria (AIC). Simulation studies reveal that under the ML and REML criteria, the method delivers a near‐exact performance with computational speeds that are an order of magnitude faster than existing exact methods, and two orders of magnitude faster than a classical bootstrap. Perhaps most importantly, the proposed method also offers a computationally feasible alternative when no known exact or asymptotic methods exist, e.g. GCV and AIC. An application is illustrated by applying the methodology to well‐known fossil data. Giving a range of plausible smoothed values in this instance can help answer questions about the statistical significance of apparent features in the data.     

Empirical Uncertain Bayes Methods in Area‐level Models

Random effects model can account for the lack of fitting a regression model and increase precision of estimating area‐level means. However, in case that the synthetic mean provides accurate estimates, the prior distribution may inflate an estimation error. Thus, it is desirable to consider the uncertain prior distribution, which is expressed as the mixture of a one‐point distribution and a proper prior distribution. In this paper, we develop an empirical Bayes approach for estimating area‐level means, using the uncertain prior distribution in the context of a natural exponential family, which we call the empirical uncertain Bayes (EUB) method. The regression model considered in this paper includes the Poisson‐gamma and the binomial‐beta, and the normal‐normal (Fay–Herriot) model, which are typically used in small area estimation. We obtain the estimators of hyperparameters based on the marginal likelihood by using a well‐known expectation‐maximization algorithm and propose the EUB estimators of area means. For risk evaluation of the EUB estimator, we derive a second‐order unbiased estimator of a conditional mean squared error by using some techniques of numerical calculation. Through simulation studies and real data applications, we evaluate a performance of the EUB estimator and compare it with the usual empirical Bayes estimator.     

产业集群竞争优势的菱形模型:结构和机理

本文在对现有竞争优势理论和模型进行考察和整合的基础上,提出了产业集群竞争优势菱形模型,建立了产业集群竞争优势的分析框架,揭示了产业集群可持续竞争优势的构成要素、功能结构和作用机理,并依据菱形模型提出培育产业集群持续竞争优势的政策建议。     

基于效用模型的网络拥塞定价策略

一种基于效用模型的网络拥塞定价策略引入了用户可承受价格、用户满意度等因素,建立网络拥塞控制的效用模型。可以优化网络资源分配,避免网络拥塞。在满足QoS指标的条件下,模型利用供求相互作用机制、价格调节机制等寻找用户满意度和网络性能的最佳结合点,从而对网络资源进行最优分配,并均衡网络负载。仿真实验结果验证了该策略的有效性和可行性。