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81.
AbstractThis paper is devoted to attain multiple objects via proposing two compound optimality criteria constructed with A-optimality criterion. The offered compound criteria are ADP-optimality to seek about an optimal design for minimizing the average variance, having an efficient parameter estimates, likewise, maximizing the probability of a particular event and AKL-optimality that provides an identified balance between model discrimination and minimizing the average variance of the parameter estimates. The equivalence theorems are stated and proved. Finally, a numerical example is applied on probit GLMs to illustrate the results for both compound criteria. 相似文献
82.
Supersaturated designs are a large class of factorial designs which can be used for screening out the important factors from a large set of potentially active variables. The huge advantage of these designs is that they reduce the experimental cost drastically, but their critical disadvantage is the confounding involved in the statistical analysis. In this article, we propose a method for analyzing data using several types of supersaturated designs. Modifications of widely used information criteria are given and applied to the variable selection procedure for the identification of the active factors. The effectiveness of the proposed method is depicted via simulated experiments and comparisons. 相似文献
83.
M. Alizadeh S.F. Bagheri E. Bahrami Samani S. Ghobadi S. Nadarajah 《统计学通讯:模拟与计算》2013,42(9):2499-2531
ABSTRACTWe introduce a new four-parameter generalization of the exponentiated power Lindley (EPL) distribution, called the exponentiated power Lindley power series (EPLPS) distribution. The new distribution arises on a latent complementary risks scenario, in which the lifetime associated with a particular risk is not observable; rather, we observe only the minimum lifetime value among all risks. The distribution exhibits a variety of bathtub-shaped hazard rate functions. It contains as particular cases several lifetime distributions. Various properties of the distribution are investigated including closed-form expressions for the density function, cumulative distribution function, survival function, hazard rate function, the rth raw moment, and also the moments of order statistics. Expressions for the Rényi and Shannon entropies are also given. Moreover, we discuss maximum likelihood estimation and provide formulas for the elements of the Fisher information matrix. Finally, two data applications are given showing flexibility and potentiality of the EPLPS distribution. 相似文献
84.
卓越教师评价标准的建立与实施对教师专业发展起着重要的引导作用。美国、英国、澳大利亚、中国香港等国家或地区的卓越教师评价体系,在教师的知识结构、能力结构、教学成果、社区服务等方面具有一些共同特征,同时在教师能力结构、价值导向等方面又有各自的侧重。卓越教师评价标准应进一步体现卓越教师的实践专长,突出卓越教师作为教学变革的领导者,强化其对卓越教师培养过程的助推功能。 相似文献
85.
The relatively high failure rates, with important consequences in many cases, suggest that the implicitly acceptable risk levels corresponding to temporary civil engineering structures and activities might exceed the bounds of normally acceptable levels associated with different societal activities. Among other reasons, this may be attributed to the lack of a rational approach for the assessment of risks associated with the different technologies supporting these activities in general, and for structures in particular. There is a need for establishing appropriate target reliability levels for structures under temporary use taking into account specific circumstances such as reduced risk exposure times. This issue is being addressed in this article. Acceptance criteria for building-structure-related risks to persons obtained in prior studies are adapted to the special circumstances of nonpermanent risk exposure. Thereby, the general principle followed is to maintain the same risk levels per time unit as for permanently occupied buildings. The adaptation is based on the statistical annual fatality rate, a life safety risk metric that allows for a consistent comparison of risks across different societal activities and technologies. It is shown that the target reliability indices taking account of the temporary use of buildings might be significantly higher than the values suggested for permanently used structures. 相似文献
86.
《Omega》2016
The multiple criteria ABC analysis is widely used in inventory management, and it can help organizations to assign inventory items into different classes with respect to several evaluation criteria. Many approaches have been proposed in the literature for addressing such a problem. However, most of these approaches are fully compensatory in multiple criteria aggregation. This means that an item scoring badly on one or more key criteria could be placed in good classes because these bad performances could be compensated by other criteria. Thus, it is necessary to consider the non-compensation in the multiple criteria ABC analysis. To the best of our knowledge, the ABC classification problem with non-compensation among criteria has not been studied sufficiently. We thus propose a new classification approach based on the outranking model to cope with such a problem in this paper. However, the relational nature of the outranking model makes the search for the optimal classification solution a complex combinatorial optimization problem. It is very time-consuming to solve such a problem using mathematical programming techniques when the inventory size is large. Therefore, we combine the clustering analysis and the simulated annealing algorithm to search for the optimal classification. The clustering analysis groups similar inventory items together and builds up the hierarchy of clusters of items. The simulated annealing algorithm searches for the optimal classification on different levels of the hierarchy. The proposed approach is illustrated by a practical example from a Chinese manufacturer. Furthermore, we validate the performance of the approach through experimental investigation on a large set of artificially generated data at the end of the paper. 相似文献
87.
Identifying design criteria for urban system ‘last-mile’ solutions – a multi-stakeholder perspective
AbstractThis study presents a novel approach to design and evaluate ‘last-mile’ solutions – encompassing the social and economic perspectives of key stakeholders. While urban system initiatives have been implemented in practice, theoretical gaps remain at the operational design level. A theoretical framework is developed, based on design criteria identified from a critical synthesis of supply chain and operations management literature, and ‘operationalised’ using an in-depth case study demonstrating implementation of a Consumer Choice Portal-Package Consolidation Centre solution, within a densely populated urban geography. Findings suggest that there is a need to re-define the role of institutional actors beyond that of the traditional governance task, to one of being able to facilitate performance outcomes. Similarly, industrial efficiency dimensions need to be reorientated to include consumer participation, social considerations and multi-stakeholder service outcomes. Finally, implications for operations theory and practising managers in city logistics are highlighted, with suggested directions for future research. 相似文献
88.
Jane South 《Social Policy & Administration》1999,33(2):132-149
The 1995 guidance HSG(95)8 "NHS Responsibilities for Meeting Continuing Health Care Needs" required health authorities to develop local policies and eligibility criteria for a range of continuing care services. The role of criteria in defining health need, and the potential effect on open-ended rights to NHS care, need to be considered in light of the prior erosion of rights associated with changes in continuing care provision. This paper examines whether the development of eligibility criteria has led to a loss of entitlements to NHS care. Analysis of empirical evidence from a study of the policies and criteria of six health authorities found that criteria for fully funded care were generally well defined and restricted access to those with very intense and specialist needs, thereby constituting a loss of rights. In contrast, the criteria for community-based services left eligibility dependent on professional discretion but often failed to clarify the relationship between individual need and levels of service provision. The research found that resource limits are likely to remain a factor in the allocation of services and this will affect the status of the criteria as potential entitlements. 相似文献
89.
Sandip Roy 《Risk analysis》2023,43(2):269-279
The formulation of risk acceptance criteria may be coupled gainfully with a prediction of the of investment required to comply with it, an exercise which can benefit from the application of socioeconomic indicators. The Life Quality Index (LQI) is one such indicator which amalgamates human mortality and wealth creation and places an implicit economic value on reduction of life risk. While there have been a number of studies to demonstrate the application of LQI pertaining to various technological systems, the present work extends it to estimate the sectoral level investment needed to reduce public risks to within the As Low As Reasonably Predictable region for the chemical industry, with specific illustration of the methodology for India. The potential reduction in public individual risk is computed as a function of percentage increase in safety investment expressed as a fraction of the industry's contribution to the nation's GDP. In addition, using a new, more accurate expression, estimates of a related parameter, the implied cost of averting a fatality (ICAF), are obtained for a number of developed economies and India. The ICAF estimates show reasonable agreement with the value of statistical life (VSL), a parameter which is integral to cost-benefit analysis of safety and environmental regulations. 相似文献
90.
在社会科学的历史中,定量和定性研究的争论持续了差不多半个世纪。随着研究者对实证主义的质疑,质性研究的数目逐渐增加。根据布瑞曼(Bryman,1988)的看法,质性研究有以下特点:(1)透过被访者的眼睛看世界;(2)描述日常生活情境的细节;(3)了解在不同社会范畴的背景中的行为及意义;(4)强调过程;(5)倾向采用文字及结构灵活的研究设计;(6)尽量避免在研究初期确立理论和观念。邓泽和林肯(Denzin & Lincoln,1998)也指出,质性研究有以下元素:(1)采用多元的研究手法;(2)涉及自然和诠译的角度;(3)在自然的情况下作出研究;(4)尝试理解和分析不同现象的… 相似文献