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John HAMILTON 《系统科学与系统工程学报(英文版)》2004,13(4):469-489
1. Introduction The services industry provides services notgoods (Hughes and Mitchell et al., 1993). Thisindustry is moving towards globalization(Kathawala and Abdou, 2003). In 1870 theservice sector employed slightly more than 20%of the U.S.… 相似文献
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BENCHMARKING ON-LINE SERVICES INDUSTRIES 总被引:2,自引:0,他引:2
John HAMILTON 《系统科学与系统工程学报(英文版)》2006,15(1):48-69
1. Introduction Benchmarking delivers a “comparison of a company’s performance in certain areas with that of other firms in its industry and / or with those firms that are identified as world class competition in specific functions and operations” (Davis et al, (2004). It can also cut across traditional lines, providing opportunities for new and innovative ways to increase performance, and be a “search for industry best practices that lead to superior performance” (Camp, 1989; Hinton et … 相似文献
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针对基于二维显示交互环境的流场可视化应用由于深度信息不足导致交互效率较低的问题,引入虚拟现实技术,提出具备多样化交互方式的沉浸式流场可视化系统。该系统基于凝视与手势交互技术,设计并实现了基于用户手势的导航方法与三维交互控件,基于用户凝视与手势的沉浸式交互面板,以及基于可视化场景的沉浸式交互管理方法与基于可视化算法树的可视化网络管理方法,对用户交互进行了系统化管理,能够在沉浸式环境提供对典型流场可视化操作的全流程支持。用户实验结果表明:该系统能够在典型流场可视化场景下为用户提供高效、自然的交互。 相似文献
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An Interactive Approach to Classification 总被引:2,自引:2,他引:0
Nien-Tsu Tuan 《Systemic Practice and Action Research》2010,23(3):237-250
Classification, entangled with obscurity and complexity, is not a task performed with ease. The obscurity in differentiating
empirical taxonomy from conceptual typology plus the complexity of people’s perceptions as well as the difficulty in developing
a versatile approach—all impinge on the path towards settling a classification structure grounded in consensus. This paper
reviews the conventional approach and the prevailing approach to dealing with classification, scrutinizes the fundamental
structures of classification and puts forward Interactive Management as a mechanism for unfolding the hierarchical structure
of classification through a participatory and disciplined way. A case study—relating to structuring the value model of precision
grinding machines in a multicriteria decision making context—demonstrates the manifold structures in classification, and demonstrates
the establishment of consensus on classification structure from different participants’ perceptions, rather than a single
designer’s preference. 相似文献
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本系统是基于Creator和Vega平台,设计并实现了可选择路径的交互式漫游。根据校园内的特点,对实景进行拍摄并制作各种纹理贴图,应用photoshop软件对纹理贴图进行处理,实现了一种快速的实景建模解决方法,并使得人机工程学的理论得到了引用与应用。灵活的运用了三维建模的关键技术,建立校园的3D模型。然后将模型导入到仿真软件中设置仿真过程。并根据要求对仿真软件进行二次开发,用以实现选择路径的漫游。 相似文献
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The focus of this paper is to design an efficient and secure solution addressing the semi trusted issue in proxy re-signature
schemes, i.e., the proxy knows the re-signature key from user A to user B, so he is able to translate any signatures made
by user A to user B, which damages the essential requirement (“non-repudiation” property) of proxy re-signature schemes. In
this paper, the authors first define the security model for threshold proxy re-signature scheme, and then propose two threshold
proxy re-signature schemes based on Ateniese-Hohenberger’s and Shao-Cao-Wang-Liang’s approach. 相似文献
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María Catalina Ramírez Jaime Plazas Camilo Torres Juan Camilo Silva Luis Camilo Caicedo Miguel Angel González 《Systemic Practice and Action Research》2012,25(2):95-116
In several rural areas in Colombia there is a serious lack of water quality supply. Thereby the problematic situation is understood
as complex one that involves stakeholders with pluralistic interests, multiple variables and requires the development of sustainable
and suitable solutions. In order to address this issue, this paper proposes an integration of engineering design framework
(CDIO) with a systemic approach. Particularly the approach emphasizes on systemic elements such as autonomy, systems within
systems, cooperation between stakeholders and cause effect relations; it also proposes a previous observing phase for engineering
design framework. Thus the proposed systemic framework aims to generate projects that improve living conditions in rural communities
and promote the production of knowledge between the stakeholders to ensure sustainability in the long term. To illustrate
the proposal, this work contains a case study that discusses a project carried out by a research team—Ingenieros Sin Fronteras Colombia—in a rural district near to Colombia’s capital. The experience, which involved and benefited 16 families in the community,
provided strong evidence to support the proposed framework. The paper concludes with a discussion about the replication of
this proposal in other contexts. 相似文献
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The term ‘Sustainable Development’ is brandished by modern businesses as a marketing ploy used to suggest evidence of ethical
conduct, innovative thinking and moral superiority. However, when analysing an organisations’ adoption of sustainable practices,
it is often clear—within the UK—that there are few activities that have been undertaken as an ethical stance instead of legal
obligation (McCormick in Environmental politics and policy in industrialized countries, MIT, London, 2002). Our hypothesis is that most methodologies and practices for environmental management do not adopt a holistic perspective,
causing significant problems in implementation from inadequate structures and communication channels (Espinosa et al. in Eur
J Oper Res, 187:636–651, 2008). In particular we consider that most organisations are currently stifled with management hierarchies that prevent informal/social
networking, which may be one of the most powerful natural forms for self-organisation. It is proposed that sustainable development
requires more efficient communication channels that foster self-organisation and self-regulation as a method for more productive
change processes. In this paper, we explain the reasons why meta-systemic principles of self-organisation and distributed
network management offer clear criteria to design an environmental management system that operates on the basis of self-controlled
individuals and communities. 相似文献
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在交互式仿真对生产物流系统的分析过程中往往需要借助于虚拟现实技术和仿真与可视化的同步计算能力。虽然高分辨率模型能够更加精确的描述实际系统的行为,但是随着仿真模型复杂度的增加,整个仿真系统需要运行在高分辨率的条件下,导致计算机计算负荷增大,计算能力成为瓶颈。在虚拟环境下对生产物流系统进行交互式仿真分析要求仿真和可视化的实时性。基于层次建模和多分辨率仿真技术,提出了一种新的生产物流系统交互式仿真方法,并以汽车生产物流系统为例,开发了原型系统,验证了新方法的有效性。 相似文献
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In multiobjective optimization, trade-off analysis plays an important role in determining most preferred solution. This paper presents an explicit interactive trade-off analysis based on the surrogate worth trade-off function to determine the best compromised solution. In the multiobjective framework thermal power dispatch problem is undertaken in which four objectives viz. cost, NOx emission, SOx emission and COx emission are minimized simultaneously. The interactive process is implemented using a weighting method by regulating the relative weights of objectives in systematic manner. Hence the weighting method facilitates to simulate the trade-offrelation between the conflicting objectives in non-inferior domain. Exploiting fuzzy decision making theory to access the indifference band, interaction with the decision maker is obtained via surrogate worth trade-off (SWT) functions of the objectives. The surrogate worth trade-off functions are constructed in the functional space and then transformed into the decision space, so the surrogate worth trade-off functions of objectives relate the decision maker's preferences to non-inferior solutions through optimal weight patterns. The optimal solution of thermal power dispatch problem is obtained by considering real and reactive power losses. Decoupled load flow analysis is performed to find the transmission losses. The validity of the proposed method is demonstrated on 11-bus, 17-lines IEEE system, comprising of three generators. 相似文献
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变电站仿真中虚拟现实场景与实时监控的连接 总被引:9,自引:0,他引:9
变电站实时监控系统是变电站重要组成部分,它与虚拟现实场景相结合可以提供更加真实的仿真环境,达到更好的培训目的。研究了变电站仿真系统中实时后台监控程序和虚拟现实场景两者之间数据通信的方法。使虚拟现实场景与后台监控程序上的操作互相同步反应,以实现有效的交互式变电站仿真系统。并以实例详细阐述了采用模拟通信程序结合变电站仿真程序,按照IEC870-5-103规约进行数据传输,实现虚拟现实场景与后台监控程序连接的过程。 相似文献
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"北斗一号"导航定位动态信号的模拟实现 总被引:5,自引:1,他引:5
随着GPS、GLONASS、GALILEO和我国北斗导航系统的建设,各种导航定位用户机在国民经济和国防建设中的应用越来越广泛,其性能也越来越受到用户的重视和关心。如何进行导航定位用户机的测试与试验,是很多用户必须面一临的问题。采用卫星导航信号模拟器,仿真真实的导航信号环境,对用户机进行功能检查和性能试验,是解决这一问题的有效途径。该文介绍了“北斗一号”双星定位系统的工作机制以及动态信号的模拟要求,详细阐述了模拟信号各种动态特征的实现途径,并对模拟信号进行了计算机仿真和系统实现。仿真和试验结果表明:“北斗一号”双星定位动态信号的模拟实现途径可行,能够满足各种用户设备的性能测试与验证。 相似文献
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基于Java和VRML虚拟场景通信方式的研究 总被引:27,自引:1,他引:26
虚拟现实建模语言(VRML)是描述虚拟场景的一种标准。VRML 2.0标准一经推出,就引起人们的高度重视。然而大多教应用对静态场景的构造设计和利用VRML本身的事件路由进行简单的交互等处理得比较完善,对于如何从场景中获得用户需要的数据、如何让用户能够精确地设置场景的参数等深层交互功能却没有得到应有的重视。本文就VRML语言与Java程序结合的方法进行了研究,讨论了Java和VRML的通信原理,用Java实现了从场景中实时获得指定点的坐标、得到指定地点的信息、动态控制场景等功能,利用它在网上建立真正交互式的三维多媒体境界,并在此基础上建立了校园导游图的应用实例。 相似文献
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VRML模型创建工具中可视化交互操作的设计和实现 总被引:6,自引:1,他引:6
虚拟现实模型语言VRML可用于构建基于Web的虚拟现实,由于直接用传统的文本编辑加浏览器验证的构建方法,未能提供所见即所得的建模手段和可视化的交互操作模式,不便于VRML虚拟场景的创建。鉴于此,在研究VRML现有规范的基础上,用VisualC 6.0作为系统开发平台,用目前通用的3D图形API标准OpenGL实现模型的真实感显示和动态预览,建立了一个VRML模型创建工具,并提供了可视化的交互操作模式,使得用户无须直接接触VRML代码,即可建立基于Web的虚拟场景。 相似文献
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基于视觉的无人作战飞机自主着陆仿真系统研究 总被引:8,自引:0,他引:8
论述了无人作战飞机自主着陆研究中所涉及到的关键技术,并设计和建立了“基于视觉的无人作战飞机自主着陆实时仿真验证平台”。该仿真平台可以对所提及的多项关键技术进行验证。特别的,系统中应用虚拟现实技术,通过相关硬件使系统形成闭环,可以在数字仿真的环境下,实时验证视觉信号反馈对无人作战飞机自主着陆的影响。基于组件对象模型技术构建的仿真平台具有可重用性好、易于维护等优点。 相似文献