统计模型及其参数的LS估计

本文首先整理了统计模型,它包括线性模型、广义线性模型和非线性模型。接着给出了它们的最小二乘估计和高斯-马尔可夫估计。最后讨论了它们的优良性。     

Critical information technology issues in Turkish healthcare

While the importance of information technology in reducing soaring healthcare costs and enhancing service quality is increasingly being recognized, significant challenges remain in how it is implemented. Although there are a few studies investigating key IT issues in healthcare in advanced countries, there are virtually none in developing countries. We bridge this gap by investigating the critical information technology issues in healthcare facilities in Turkey. These issues are developed based on the opinions of senior hospital managers. The top ten issues include privacy, quality, security, and the implementation of electronic medical records. Further analyses provide additional insights into the results.     

强力喷丸对提高碳氮共渗齿轮接触疲劳强度的研究

通过对碳氮共渗齿轮试片进行了多次强力喷丸试验．研究了不同喷丸参数下的强力喷丸的效果及喷丸后的低温回火处理对提高齿轮试片表面接触疲劳强度的影响。为强力喷丸工艺更好地应用于工业生产提供了一些参考。     

Hybrid MEMS optical scanner for volumetric 3‐D displays

Abstract— A fabrication technique and characteristics of high‐power‐handling microelectromechanical systems (MEMS) optical scanners for laser 3‐D volumetric‐image display application is reported. The MEMS scanner is designed to control the reflection of high‐power YAG‐laser beam by using the optomechanical combination of a dielectric‐film‐coated mirror cube and an electrostatic‐MEMS‐scanner platform. These hybrid‐type MEMS optical scanners have a stroke of about 20° at resonant frequencies of 600 Hz when a 45‐V pulse voltage is applied.     

新型RE-Al-Ti-B中间合金制备及对α-Al重熔细化效果的研究

借助X射线衍射(XRD)、扫描电镜(SEM)、光学显微镜(OM)等分析技术,研究了采用熔配法制备新型RE-Al-Ti-B中间合金时,强力搅拌对RE-Al-Ti-B中间合金显微组织的影响,并进一步研究了RE-Al-Ti-B中间合金对α-Al重熔细化组织的影响.结果表明,强力搅拌对RE-Al-Ti-B中间合金显微组织产生重要影响,强力搅拌后中间合金组织分布越均匀,有效形核核心越多,对α-Al的重熔细化效果越好.随着重熔次数的增加,形核核心聚集沉淀,有效形核核心减少,重熔细化效果衰退.     

Locally Optimal Tests Against Unit Roots in Seasonal Time Series Processes

This paper builds on the existing literature on tests of the null hypothesis of deterministic seasonality in a univariate time-series process. Under the assumption of independent Gaussian errors, we derive the class of locally weighted mean most powerful invariant tests against unit roots at the zero and/or seasonal frequencies in a seasonally observed process. Representations for the limiting distributions of the proposed test statistics under sequences of local alternatives are derived, and the relationship with tests for corresponding moving average unit roots is explored. We also propose nonparametric modifications of these test statistics designed to have limit distributions which are free of nuisance parameters under weaker conditions on the errors. Our tests are shown to contain existing stationarity tests as special cases and to extend these tests in a number of useful directions.     

Are cultural characteristics associated with the relationship between self and others’ ratings of leadership?

This study examined the relationship between self and subordinate ratings of leadership and the relationship between self and peer ratings of leadership for 964 managers from 21 countries. Using multilevel modeling, the authors found that cultural characteristics moderated the relationship between self and others’ ratings of leadership. Specifically, the relationship between self and subordinate ratings, as well as between self and peer ratings, was more positive in countries that are characterized by high assertiveness. The relationship between self and subordinate ratings, as well as between self and peer ratings, was also more positive in countries characterized by high power distance. The authors also found a leniency bias in individualistic cultures for self, peer, and subordinate ratings. In sum, cultural characteristics should be considered in attempts to understand relationships between self and other ratings. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

YB32-300型四柱万能液压机活塞杆修复工艺措施

针对YB32-300型四柱万能液压机液压活塞杆的损坏情况,通过对其工作原理、结构特点、材质及受力情况的分析和数种修复方案工艺措施的比较,确定出一种最佳的工艺方案措施,并进行相应的强度理论校核计算。     

Determinants of training transfer in the wine industry: conceptual hypotheses and results for Rioja (Spain)

This paper takes the perspective of both managers and of employees to examine the determinants of training transfer in the wine industry. To that end, a number of conceptual hypotheses are formulated focusing on three factors: the design of the training, the characteristics of the trainees, and those of the organization, with these being tested using information from the Rioja wine industry (Spain). Three contextual characteristics are compared: the company ownership, its location, and its size. The results indicate that, from the perspective of management, transfer is related to the organizational environment; while from the perspective of the employee, transfer reflects their motivation for training. According to managers, significant differences exist among the three contexts, while, according to employees, there are no contextual differences.     

基于VaR约束的企业经营者组合监督机制研究

企业经营者的监督约束机制是保证企业有效运行,使经营者才能正常发挥的一个重要保障机制.将组合投资理论应用于企业经营者组合监督机制设计中,提出运用VaR约束下的均值—方差模型来确定多种监督机制的最优实施比例,并用一算例说明了VaR约束下均值—方差法的应用.