Pro-innovation culture,ambidexterity and new product development performance: Polynomial regression and response surface analysis

This study examines the intervening role of organizational ambidexterity in the relationship between pro-innovation culture and new product development (NPD) performance. The results indicate that organizational ambidexterity positively mediates the relationship between pro-innovation culture and NPD performance. The results show that when both exploration and exploitation are increased simultaneously, after an initial decline, NPD performance shows a rising trend. NPD performance tends to decline generally when there is an imbalance between the two though the plateau is at a point where exploitation is slightly higher than exploration. Additionally, pro-innovation culture can increase the gap between exploration and exploitation for exploration-oriented firms, which can lower their NPD performance. Overall, this study contributes to a deeper understanding of the underlying mechanisms that explain why firms with pro-innovation culture have higher NPD performance. Further, it enhances our understanding of the role of pro-innovation culture as an organizational context for building organizational ambidexterity, and provides new insights that can help reconcile the combined and balanced views of ambidexterity in enhancing NPD performance.     

浅谈哈萨克族人生礼仪与民族进步

哈萨克族的人生礼仪是在相对封闭的社会环境中产生的,当时它适应了草原文化的生活需求。针对当今萨克族人生礼仪中操办喜事中不作任何改良和规范来全方位地继承传统的做法;周年纪念式中的竞争操办心理所引发铺张浪费;婚姻中彩礼的繁重性,索取礼仪的层次性、多样性、复杂性;抢亲等这一不正当婚姻形式突然性、不稳定性等典型事项,提出从教育入口全面提高民族人口素质;加大破除愚昧无知的宣传力度,树立科学发展观;大力开展先进型教育活动,营造健康文明的生活氛围等改良对策。     

新疆城市民族工作的新问题及对策研究

城市化进程中,各种关系错综复杂,做好城市民族工作应注意不同民族间的利益,新疆城市民族工作由于宗教信仰、风俗习惯不同、传统文化的差异性、生活方式和价值取向多样化,使得民族工作出现了新问题,经过调查和研究,提出了以下对策：大力宣传党的民族宗教政策,不断强化公民教育;加强城市社区管理,塑造城市少数民族的居住格局;加强城市流动人口管理;恐怖暴力事件影响大,打击恐怖实刻不容缓;坚决维护边疆地区稳定,保持地区安定团结局面;积极推进新疆城市民族工作的法制建设。     

农村留守儿童的现状及问题——以广西贺州市富川县走访调查为例

农村留守儿童是社会的主要弱势群体之一。在当代社会,留守儿童的问题越来越突出。通过实地调查,对留守儿童的现状和问题进行了分析,认为留守儿童内心渴望接触新事物,监护人的文化水平不利于其健康成长,并提出留守儿童并非都是孤僻的群体。分析了留守儿童产生的根源,提出了改善农村留守儿童现状的建议性措施。     

On D-optimal robust second order slope-rotatable designs

Das and Park (2006) introduced slope-rotatable designs overall directions for correlated observations which is known as A-optimal robust slope-rotatable designs. This article focuses D-optimal slope-rotatable designs for second-order response surface model with correlated observations. It has been established that robust second-order rotatable designs are also D-optimal robust slope-rotatable designs. A class of D-optimal robust second-order slope-rotatable designs has been derived for special correlation structures of errors.     

ADF单位根检验中联合检验LM统计量研究

 本文研究了ADF单位根检验中参数联合约束的拉格朗日乘数检验。首先,本文构建了4个LM统计量并推导了它们的极限分布;然后,运用蒙特卡罗试验,模拟了有限样本容量常用检验水平下的临界值,拟合了临界值关于样本容量的响应面函数,并总结了LM统计量有限样本容量下的统计特性;比较分析了这4个LM统计量的检验功效及实际检验水平;最后,一个实例分析简要说明了这几个统计量在单位根检验中的应用。     

Overreporting of voting participation as a function of identity

This paper proposes an explanation of the overreporting of voting participation based in Stryker's identity theory (1980), integrating the social pressure approach of Bernstein, Chadha, and Montjoy (2001). A set of logistic regression models is estimated to predict the propensity to overreport using indicators of extensive and intensive commitments to a political identity. Models are tested using vote verification data from five years of the American National Election Studies (1978, 1980, 1984, 1988, and 1990). Identity commitments are strongly predictive of overreporting and conventional understandings of social desirability fail to predict overreporting. Findings suggest that a conceptualization of self-reported voting as a measure of identity may provide a better explanation for why respondents overreport their voting in terms of extensive and intensive commitments to a political identity.     

INVENTORY PROCESSES: QUASI-REGENERATIVE PROPERTY,PERFORMANCE EVALUATION,AND SENSITIVITY ESTIMATION VIA SIMULATION

We consider a single-commodity, discrete-time, multiperiod (s, S)-policy inventory model with backlog. The cost function may contain holding, shortage, and fixed ordering costs. Holding and shortage costs may be nonlinear. We show that the resulting inventory process is quasi-regenerative, i.e., admits a cycle decomposition and indicates how to estimate the performance by Monte Carlo simulation. By using a conditioning method, the push-out technique, and the change-of-measure method, estimates of the whole response surface (i.e., the steady-state performance in dependence of the parameters s and S) and its derivatives can be found. Estimates for the optimal (s, S) policy can be calculated then by numerical optimization.     

Extension of Central Composite Design for Second-Order Response Surface Model Building

The central composite design (CCD) is perhaps the most popular class of second-order response surface designs. Even though the CCDs are popular for response surface designs, this class of design has some limitations such as it does not sometimes possess good statistical properties, and it does not fit complicated models well. In this article, we propose extended central composite designs (ECCDs) to overcome these limitations. We compare ECCDs with CCDs in terms of average prediction variance, and find that ECCDs are better than CCDs.     

The Bivariate Normal Copula

We collect well-known and less-known facts about the bivariate normal distribution and translate them into copula language. In addition, we provide various (equivalent) expressions for the bivariate normal copula, we compute its Gini's gamma, and we derive improved bounds and approximations on its diagonal.