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The application of optimization techniques in digital simulation experiments is frequently complicated by the presence of large experimental error variances. Two of the more widely accepted design strategies for the resolution of this problem include the assignment of common pseudorandom number streams and the assignment of antithetic pseudorandom number streams to the experimental points. When considered separately, however, each of these variance-reduction procedures has rather restrictive limitations. This paper examines the simultaneous use of these two techniques as a variance-reduction strategy in response surface methodology (RSM) analysis of simulation models. A simulation of an inventory system is used to illustrate the application and benefits of this assignment procedure, as well as the basic components of an RSM analysis. 相似文献
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About 50?years ago, Efron noted some counterintuitive properties of the long-term behavior of contests involving dice. For instance, consider the 6-sided dice whose sides are labeled (4,4,4,4,0,0), (3,3,3,3,3,3), (6,6,2,2,2,2), and (5,5,5,1,1,1). Each die has a 2/3 probability of rolling a higher number than the next one in the list and the last has the same 2/3 probability of rolling a higher number than the first. The non-transitivity of games involving non-identical dice was popularized by Gardner (Sci Am, 223:110–114, 1970). Although Gardner and other authors have observed that non-transitive dice serve to illustrate the complexities of the theory of voting, it does not seem that much attention has been paid to the corresponding voting system. Our purpose in this article is to present this voting system and compare its properties with those of other voting systems. One of the most interesting properties is the fact that cancellation with respect to the Efron dice voting system can replace cancellation with respect to pairwise preferences in Young’s characterization of the social choice function associated with the Borda Count. 相似文献
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Socioeconomic System of the Oil Boom and Rural Community Development in Western North Dakota
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An oil boom is a complex social and economic phenomenon. The socioeconomic system presented in this article represents a novel effort to explicate boom impacts and changes, within a systems framework, at the community level to enhance community planning and development efforts. Most boomtown studies focus on longitudinal changes of a boom‐bust‐recovery cycle or social‐disruption‐based approaches. This article is an effort to demonstrate that longitudinal changes or social disruptions of a boom manifest through the interactions and interrelationships between social entities and stakeholders acting within the boom conditions and surrounding conditions. The socioeconomic system approach in this article analyzes the boom as a system, which provides a useful lens for many other rural communities currently experiencing unconventional oil and gas development in the United States. The socioeconomic system highlights five main challenges or factors that need to be addressed through community development strategies: develop affordable housing, invest in community infrastructure, expand public services, attract new businesses to the area, and develop better community integration strategies to build trust and unity within the community. This article is qualitative and exploratory in nature. As a result, it explicates the functions, structure, and relationships between system entities to provide a broader understanding of coherence, conflicts, and synergies within a system. 相似文献
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As in any new area of investigation, the study of the phenomenon of burnout contains much potential benefit, especially to workers in helping/service professions; and it contains sources of error which may delay or distort understandings that are sorely needed. This paper identifies and explains many pitfalls and sources of error in developing theory and research about burnout. After discussing the limitations of the current definitions of burnout, the authors explore the ramifications of the most well supported definition. Specific suggestions are made for further investigation, especially in the area of individual characteristics and their interaction with the burnout phenomenon. Finally, methodologies most likely to yield solid, usable information for practitioners are discussed. 相似文献
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Heather M. Thompson Armeda Stevenson Wojciak Morgan E. Cooley 《Journal of Family Social Work》2013,16(3):231-252
The purpose of this article is to apply Bowen family systems theory to work with families involved in the child welfare system. An overview of family systems theory is provided, and then specific tenets of Bowen family systems theory are presented. The authors highlight incidents within the child welfare setting that can be conceptualized through Bowen family therapy terms and concepts. A case study is used to highlight how this theory could be applied in practice. Furthermore, recommendations for child welfare practice and policy implications are discussed, utilizing the lens of a Bowenian family systems approach. 相似文献
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Abstract The present paper provides a framework for working with children and families where there are domestic violence and child protection concerns. A model of practice developed by the St George Domestic Violence Counselling Service and the St George Child and Adolescent Mental Health Service in the South East Sydney and Illawarra Health Service (NSW, Australia) is outlined. The present paper includes a discussion on a recently developed service agreement between the two services and a case study focusing on a ‘system of safety’ when working with children. The present paper focuses on the effects of domestic violence on women and children by male perpetrators. We do not ignore that men may be victims of domestic violence; however, the authors recognise the gendered nature of domestic violence and the significant number of women and children who experience and live with domestic violence. 相似文献
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Jean M. Cooley 《Smith College studies in social work》2013,83(1):26-43
Supervision is an activity filled with ethical dilemmas related to the power held by the supervisor, a power that should be exercised with care. This article explores some of these dilemmas through the analysis of supervision vignettes viewed from the perspective of social constructionism, in particular, from the insights of French philosopher Michel Foucault. It concludes with suggestions to exercise supervisory power ethically. 相似文献