共查询到20条相似文献,搜索用时 31 毫秒
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Simanta Roy-Chowdhury 《Systemic Practice and Action Research》1997,10(2):127-135
An outline is given of the historical development of systems ideas within the field of therapy. A history of systemic therapy
is provided, from the early days of the Mental Research Institute to recent influences upon therapeutic practice. Key applications
of theory are described and current areas of debate are highlighted. 相似文献
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Micro triadic structure is an important motif and serves the building block of complex networks. In this paper, the authors define structure entropy for a social network and explain this concept by using the coded triads proposed by Davis and Leinhardt in 1972. The proposed structure entropy serves as a new macro-evolution index to measure the network’s stability at a given timestamp.Empirical analysis of real-world network structure entropy discloses rich information on the mechanism that yield... 相似文献
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BOTTLENECKS IN PRODUCTION NETWORKS: AN OVERVIEW 总被引:1,自引:0,他引:1
Yongcai WANG Qianchuan ZHAO Dazhong ZHENG Center for Intelligent Networked Systems Department of Automation Tsinghua University Beijing P.R.China 《系统科学与系统工程学报(英文版)》2005,14(3):347-363
1. Introduction Performances of a production system, such as the throughput, the circle time and the average delay, etc., are affected by the capacities of machines and resources available in the system. Some of them may affect the system performances more than others. Usually, the limitation of a system can be traced to the limitation of one or two machines or one or two kinds of resources, commonly called bottlenecks. From system point of view, bottlenecks are the congestion points of the sy… 相似文献
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为实现计算机自动识别和搜索特定类型的一维二值元胞自动机,通过计算其演化熵,实现了对一维二值元胞自动机动力学行为描述的度量,并给出了演化熵平面类型域与其不同动力学行为之间的对应关系,最后结合演化熵分析了不同的Langton参数下一维二值元胞自动机动力学行为的分布情况,发现一维二值元胞自动机的Langton参数在刻画其动力学行为时与普适规律不符,而具有以参数0.5为中心的对称性。 相似文献
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本文试图通过系统科学的相关知识,特别是应用系统演化的熵理论,在梳理和分析法律移植基本情况的基础上,指出法律系统演进的动因,并探索我国法律体系完善和发展的新思路。 相似文献
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There seems to be a significant gap between the theoretical and the practical aspects ofscheduling problems in the job shop environment. Theoretically, scheduling systems are designed onthe basis of an optimum approach to the scheduling model. However in the practice, the optimum thatis built into the scheduling applications seems to face some challenges when dealing with the dynamiccharacter of a scheduling system, for instance machine breakdown or change of orders. Schedulingsystems have become quite complex in the past few years. Competitive business environments andshorter product life cycles are the imminent challenges being faced by many companies these days.These challenges push companies to anticipate a demand driven supply chain in their businessenvironment. A demand-driven supply chain incorporates the customer view into the supply chainprocesses. As a consequence of this, scheduling as a core process of the demand-driven supply chainmust also reflect the customer view. In addition, other approaches to solving scheduling problems, forinstance approaches based on human factors, prefer the scheduling system to be more flexible in bothdesign and implementation. After discussion of these factors, the authors propose the integration of adifferent set of criteria for the development of“ scheduling systems which not only appears to have abetter flexibility but also increased customer-focus. 相似文献
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系统多层次灰色熵优选理论及其应用 总被引:7,自引:0,他引:7
根据流域实际情况建立了综合评价梯级水电开发的评价指标体系.提出系统多层次灰色熵优选模型,由系统论将决策水利水电方案的影响因素分成若干个子系统,每个子系统由相应的评价指标组成.首先根据评价指标的灰色关联系数,由熵权法计算出各指标的权重,然后得到各个子系统组成的关联度矩阵,类似求出各子系统的权重,最后由子系统权重和关联系数求出系统的综合评价关联度,由关联度的大小对水利水电系统中的方案排序.将模型应用于西藏尼洋河流域规划建设的7座梯级水电站,得到符合实际情况的电站建设顺序. 相似文献
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供应链管理问题的研究现状及挑战 总被引:28,自引:0,他引:28
主要介绍了目前供应链在数学模型的构建、供应链成员间的多方协作问题上的研究现状和面临的挑战 ,着重讨论了企业内部供应链的各类优化模型和快速算法 ,包括制造系统、运输问题、库存决策等各个方面 ;以及外部供应链中买 -卖、库存 -分销、库存 -生产等几类协作机制 ;引入了供应链的敏捷性概念 ,在博弈中“双赢”策略的基础上提出了供应链协作中的“双优”策略 ,最后给出了供应链上的信息传递中的扭曲现象的分析、后勤重构的必要性和特征、及绿色供应链的一些研究方法 . 相似文献
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港口与航运运营活动已经引起严重的环境问题.为了实现港口与航运业减排的目标,系统地分析如何构建绿色港口和绿色航运运营系统显得尤为重要.本文从绿色港口、绿色航运和绿色海事政策三个方面对港口与航运业节能减排的相关文献进行了总结.绿色港口问题包括港口管理和港口技术;绿色航运问题包括航运管理和航运技术;绿色海事政策问题包括一些现有的政策和措施及其对航运业和环境的影响.本文也提出了一些未来的研究方向,包括绿色港口导向的研究、绿色航运导向的研究和排放政策导向的研究. 相似文献
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信息质量检验的熵模型 总被引:3,自引:0,他引:3
基于信息—熵理论证明在样本足够大的条件下,抽样信息量的平均值近似服从正态分布;并应用该结论提出一种检验信息质量的方法,进一步研究先验信息和后验信息的可信度问题,提高决策人甄剐信息和做出正确决策的能力。 相似文献
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研究了投资决策期权估值问题,基于熵定价理论,结合美式期权解析近似计算方法,建立了投资决策期权价值估算的算法模型,该模型框架可应用于实物期权价值的数值方法求解。 相似文献
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王飞跃 《复杂系统与复杂性科学》2005,2(3):13-22
从历史起源、近代发展、当前状态等方面简要地讨论了社会物理学的意义和作用,并从物理学、社会学和哲学的角度进行了阐述.重点是根据 Popper关于现实的三个世界模型,特别是作为世界3的人工世界,对社会物理学进行重新认识,试图理清三个世界与社会物理、社会心理、社会计算和人工社会、计算实验、平行系统之间的内在联系.还探讨了力学和控制中的一点概念和方法在社会物理学中的应用问题. 相似文献
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基于熵权法的教育质量评价方法 总被引:5,自引:0,他引:5
提出一种基于熵权法的教育质量评价方法。在承认不同学校生源入学基础不同的前提下,阐述了奖罚加权矩阵概念及其系数确定法,其质量评价指标突出了学生的进步而不是分数,并利用四所中学的数据进行实际分析,比较客观公正地评价了不同学校的教育质量。 相似文献
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复杂网络研究与社会网络分析有着十分密切的关系,最近10年复杂网络的快速发展,得益于社会网络分析所建立起来的相关概念和方法,促进了社会网络分析的发展.从合作竞争网络、社会网络中的社团结构、社会网络中的空间结构等几个方面对我们最近几年的研究进展作了简单介绍,包括合作竞争网络的拓扑共性与动力学共性,社团结构的比较性定义、搜寻方法与显著性指标,空间结构距离幂律分布的产生原因及其对拓扑结构及其功能的影响等. 相似文献
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Revisiting Social Dominance Theory: Invoking a More Retroductively-Oriented Approach to Systemic Theorizing 总被引:1,自引:1,他引:0
Norma R. A. Romm 《Systemic Practice and Action Research》2013,26(2):111-129
Social Dominance Theory, as forwarded by Sidanius and Pratto (Social dominance: an intergroup theory of social hierarchy and oppression, 1999) and as elaborated upon in continuing research by themselves and others, claims to offer a way of exploring the structuring of social systems along the lines of group-based hierarchies. In this article I endeavour to highlight the manner in which this mode of theorizing and of approaching the study of social “realities” might have deleterious social effects, via its potentially self-fulfilling claims. I present an alternative way of approaching (co)-inquiries into the social worlds of which we are part––based on an examination of some qualities of retroductive thinking/imagining, which I interpret and extend in order to take more fully into account the impact of our knowing processes on the social worlds being addressed. 相似文献