硒与人体健康的研究

硒是一种重要的微量元素,它在临床医学和预防医学领域内的重要作用及其取得的社会效益,日益引起了人们的兴趣和关注。有人呼吁,要象重视盐中加碘一样增加人体对硒的有效摄入。基于此,本文述及了微量元素硒与人体健康的研究开发情况。     

行政管理学教学研究中的问题

行政管理学的教学研究只有与中国行政管理的实践相结合、与中国社会发展对行政管理学的要求相结合,才会有旺盛的生命力。目前行政管理学教学研究中存在着“三多三少”:讲外国的多,讲中国的少;讲理论的多,讲应用的少;讲过去的多,讲现在的少。为此,在行政管理学教学研究中要努力做到:本土化、时代性、实践性、开放性。     

华夏区域文化研究的新篇章——评薛瑞泽、许智银著《河洛文化研究》

在河洛文化研究快速发展的同时,新的学术成果不断涌现无疑为推进河洛文化研究起了重要的促进作用。《河洛文化研究》的出版就是这方面的表现。该书高屋建瓴,对河洛文化的发展作了寻根溯源的工作,对河洛文化的形成与发展作了系统梳理,并探讨了河洛文化的内涵和特点,在河洛文化研究中起着承前启后的作用。     

几个亚洲国家的远程MBA教学项目的区域性比较研究

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Statistical analysis of performance indicators in UK higher education

Summary.  Attempts to measure the quality with which institutions such as hospitals and universities carry out their public mandates have gained in frequency and sophistication over the last decade. We examine methods for creating performance indicators in multilevel or hierarchical settings (e.g. students nested within universities) based on a dichotomous outcome variable (e.g. drop-out from the higher education system). The profiling methods that we study involve the indirect measurement of quality, by comparing institutional outputs after adjusting for inputs, rather than directly attempting to measure the quality of the processes unfolding inside the institutions. In the context of an extended case-study of the creation of performance indicators for universities in the UK higher education system, we demonstrate the large sample functional equivalence between a method based on indirect standardization and an approach based on fixed effects hierarchical modelling, offer simulation results on the performance of the standardization method in null and non-null settings, examine the sensitivity of this method to the inadvertent omission of relevant adjustment variables, explore random-effects reformulations and characterize settings in which they are preferable to fixed effects hierarchical modelling in this type of quality assessment and discuss extensions to longitudinal quality modelling and the overall pros and cons of institutional profiling. Our results are couched in the language of higher education but apply with equal force to other settings with dichotomous response variables, such as the examination of observed and expected rates of mortality (or other adverse outcomes) in investigations of the quality of health care or the study of retention rates in the workplace.     

Some Fundamental Properties of a Multivariate von Mises Distribution

In application areas like bioinformatics, multivariate distributions on angles are encountered which show significant clustering. One approach to statistical modeling of such situations is to use mixtures of unimodal distributions. In the literature (Mardia et al., 2012 Mardia , K. V. , Kent , J. T. , Zhang , Z. , Taylor , C. , Hamelryck , T. ( 2012 ). Mixtures of concentrated multivariate sine distributions with applications to bioinformatics . J. Appl. Stat. 39 : 2475 – 2492 .[Taylor &; Francis Online], [Web of Science ®] , [Google Scholar]), the multivariate von Mises distribution, also known as the multivariate sine distribution, has been suggested for components of such models, but work in the area has been hampered by the fact that no good criteria for the von Mises distribution to be unimodal were available. In this article we study the question about when a multivariate von Mises distribution is unimodal. We give sufficient criteria for this to be the case and show examples of distributions with multiple modes when these criteria are violated. In addition, we propose a method to generate samples from the von Mises distribution in the case of high concentration.     

A simulation study comparing performance of CONWIP and bottleneck-based release rules

Many firms seeking production economies and quicker throughput times have adopted cellular manufacturing techniques. New product introductions, increased product variety and process changes all add elements of uncertainty to the cell, and dynamic management techniques are required to achieve the benefits expected. This paper considers the problem of managing the flow of material into a manufacturing cell in order to maximize the output rate for a given level of work-inprocess inventory. The manufacturing cell is patterned after an Intel facility that assembles and tests microprocessors for the computer industry. The cell is studied under conditions in which a single bottleneck arises and those under which there are multiple bottlenecks. Alternative procedures for releasing material into the cell are evaluated in order to determine which offer the greatest advantage to managers.     

A monte carlo study of some multivariate nonparametric statistics for profile analysis of several samples †

This paper describes the results of simulation studies on a class of nonparametric tests,T ₀, developed for the hypothesis of homogeneityH ₀, of several multivariate populations, and also on the class of testsT ₁, developed subsequently for the hypothesisH ₁, of parallelism of population profiles. Simulation studies relate to, first, the investigation of accuracy of the large-sample null-approximation for finite samples and, secondly, the study of powers under various types of alternatives to H ₀ and H ₁.     

An integrated simulation model for effective planning of maintenance operations for Saudi Arabian Airlines (SAUDIA)

An effective maintenance system is essential for SAUDIA in order to meet its set objectives. These objectives include minimal flight cancellations, minimal delays, minimal repair turn time, and effective utilization of maintenance resources. In this paper, the elements of an integrated simulation model for SAUDIA have been described. The integrated model consists of several modules. These are planning and scheduling, organization, supply, quality control and performance measures. The required data and software for such a model have been described. Also, the utility of such a model for SAUDIA has been outlined.