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三维场景绘制是游戏、虚拟现实等领域中的一个重要内容,而地形绘制则是三维场景绘制的基础.通过引入分子束附生领域中粒子沉积的概念,在模拟一般地形的基础上,更好的实现了火山、岛屿等一类特殊地形的三维地形绘制.在此基础上与多重纹理,天空盒等技术相结合获得了较好的真实感效果.实验结果表明,此方法能够生成更加真实的三维场景. 相似文献
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提出了一种基于几何模型的复杂三维场景语义环境模型生成方法.主要研究复杂三维场景几何模型可行面采样点的语义信息抽取方法,基于采样点生成场景高度图.根据三维场景中障碍物几何模型的位置关系,设计了“类括号匹配算法”,确定场景高度图中哪些是可行路径点.在此基础上,构造了复杂三维场景的语义路径图,实现了复杂虚拟场景中障碍物语义的抽取及运动语义的匹配.初始场景高度图、确定路径点后的场景高度图及场景语义路径图构成了复杂三维场景的语义环境模型,模型构建过程中充分考虑了虚拟角色的个性化特点(如身高、步长和运动行为偏好等).该模型增强了虚拟角色感知环境的能力,能够自动识别运动路径上的各种障碍物语义,实现了场景中虚拟角色运动匹配的自动化和运动行为的多样性. 相似文献
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网络虚拟场景中,替身作为用户在场景中的表现方式,可以在场景中运动并与其他用户的替身或事物进行交互,替身行为的逼真性直接影响到虚拟场景的逼真性。采用关节化的人体模型可以较有效地提高逼真度,但关节化的替身与非关节化的其他场景对象相比,在运动和交互过程中大大地增加了网络负载,因此需要采用DR算法来有效地减小网络通信负载。本文研究了适合于关节化人体模型的DR预测算法,分析了运用DR预测算法不可避免地产生的替身运动的不连贯性,在此基础上提出了一种基于连续样条曲线实现的平滑过渡算法,较好地解决了替身运动的平滑过渡问题。 相似文献
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火灾逃生教育具有重要的现实意义,但在现实生活中,面向公众的火灾逃生演练通常花费很大。虚拟现实技术也能模拟火灾场景,可以增强逃生教育的效果,同时能大大降低训练的费用。建立了面向火灾逃生训练的虚拟现实原型系统,我们编制了集粒子动画和声音于一体的游戏风格图形界面,用户可以控制替身在虚拟火灾场景中逃生,替身的运动采用骨骼动画实现,我们使用面部表情图片来描述替身的情绪状态。初步的实验结果表明,该演示系统能够使火灾逃生演练变得更形象。 相似文献
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场景图系统是在虚拟环境生成领域应用十分广泛的技术,而刚体是虚拟环境中大量存在的一种物体对象类型.借鉴一般场景图的思想,对基于场景图系统的刚体运动建模方法进行了研究,面向通用场景图系统提出了一个实时刚体动力学仿真模拟框架,并针对Vega场景图系统给出了基于开源动力学引擎的模块化实现. 相似文献
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Lü Min 《系统工程与电子技术(英文版)》2008,19(3)
To study the uncertain optimization problems on implementation schedule, time-cost trade-off and quality in enterprise resource planning (ERP) implementation, combined with program evaluation and review technique (PERT), some optimization models are proposed, which include the implementation schedule model, the timecost trade-off model, the quality model, and the implementation time-cost-quality synthetic optimization model. A PERT-embedded genetic algorithm (GA) based on stochastic simulation technique is introduced to the optimization models solution. Finally, an example is presented to show that the models and algorithm are reasonable and effective, which can offer a reliable quantitative decision method for ERP implementation. 相似文献
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A calculus for services innovation 总被引:1,自引:1,他引:0
Innovation in the services area - especially in the electronic services (e-services) domain - can be systematically developed by first considering the strategic drivers and foci, then the tactical principles and enablers, and finally the operational decision attributes, all of which constitute a process or calculus of services innovation. More specifically, there are four customer drivers (i.e., collaboration, customization, integration and adaptation), three business foci (i.e., creation-focused, solution-focused and competition-focused), six business principles (i.e., reconstruct market boundaries, focus on the big picture not numbers, reach beyond existing demand, get strategic sequence right, overcome organizational hurdles and build execution into strategy), eight technical enablers (i.e., software algorithms, automation, telecommunication, collaboration, standardization, customization, organization, and globalization), and six attributes of decision informatics (i.e., decision-driven, information-based, real-time, continuously-adaptive, customer-centric and computationally-intensive). It should be noted that the four customer drivers are all directed at empowering the individual - that is, at recognizing that the individual can, respectively, contribute in a collaborative situation, receive customized or personalized attention, access an integrated system or process, and obtain adaptive real-time or just-in-time input. The developed process or calculus serves to identify the potential white spaces or blue oceans for innovation. In addition to expanding on current innovations in services and related experiences, white spaces are identified for possible future innovations; they include those that can mitigate the unforeseen consequences or abuses of earlier innovations, safeguard our rights to privacy, protect us from the always-on, interconnected world, provide us with an authoritative search engine, and generate a GDP metric that can adequately measure the growing knowledge economy, 相似文献
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《系统工程理论与实践》2014,(4)
正August 10-14,2015Beijing,China The International Congress on Industrial and Applied Mathematics(IClAM)is the premier international congress in the field ofapplied mathematics held every four years under the auspices ofthe International Council for Industrial and Applied Mathematics.From August 10 to 14,2015,mathematicians,scientists and entrepreneurs fiom around the world will gather in Beijing,China for the 8th IClAM to be held at 相似文献
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论生物系统中的功能不守恒性 总被引:1,自引:0,他引:1
张知彬 《复杂系统与复杂性科学》2004,1(2):43-51
根据能量守恒定律,能量一次转换所做的总功应等于输入的总能量。但在生物系统中,能量的转换是多次的,其总功之和大于系统输入的总能量,此现象称之为功能不守恒性。能量转换效率越高,功能差别越大。能量通过细胞水平的多次转换,总功可提高至2倍左右。能量通过生态系统水平多次转换,总功可提高至1.4倍左右。通过系统内各子系统能流之和称为序能,反映了系统有序性大小,它取决于系统输入总能量和能量转换效率。根据序能原理,用GDP^2/9(GDP为国内生产总值,Q为能量总输入)反映人类社会功能和效率,要比单纯用GDP更客观。绿色GDP应同时考虑使GDP^2/Q增长最大和使自然生态系统的序能最大。人的经济行为和动物的行为对策也符合序能原理。 相似文献
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This paper is about the Wuli, Shili, Renli (WSR) systems methodology. An important concept within this, Renli, has been developed from Confucian philosophy to clarify to Chinese researchers the necessity of dealing with human relations in systems practice. At present, the only formal means of operationalizing Renli that people are exploring in China is to import from the West methods for organizing debate. However, the concept of Renli suggests that more is needed than methods alone. In particular, facilitation skills are required. It is argued that the development of facilitation skills can be enhanced if researchers can gain both theoretical and practical knowledge of group dynamics, and engage in activities of self-reflection to look at, and alter, their own roles in these dynamics and the wider sociopolitical system. There are therefore three aspects to Renli: the use of systems methods for organizing debate, the acquisition of facilitation skills, and self-reflection geared toward the development of facilitation skills and enhanced critical awareness of the politics of intervention. 相似文献
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李弋 《系统工程理论与实践》2011,(Z2):70-74
随着云计算的发展,新的应用不断涌现,但电子邮件服务依然占有着重要的地位.邮件服务器是一种I/O密集的应用.在云计算时代,越来越多的用户邮件保存在服务器端,邮件在从客户端传输到服务器端之前,邮件或者邮件的部分内容在服务器端可能已经存在.基于这种现象,提出了一种方案,通过引入计算的代价来降低通信量,从而提高邮件服务器的处理能力.对电子邮件的格式和SMTP协议进行了扩充,引入了附件和正文分离传输的模式.在邮件传输时,客户端先计算附件的散列值,并作为正文的一部分传输到服务器端,服务器端再根据散列值来判断附件是否需要传输. 相似文献
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金工工艺的优化设计 总被引:2,自引:0,他引:2
邹庆化 《系统工程理论与实践》1996,10(11):106-112
运用价值工程与运筹工程理论, 在金工工艺单项设计指标优化的基础上, 对其设计指标也进行了全面优化。 相似文献
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《系统工程理论与实践》2014,(5)
正August 10-14,2015Beijing,ChinaThe International Congress on Industrial and Applied Mathematics(ICIAM)is the premier international congress in the field of applied mathematics held every four years under the auspices of the International Council for Industrial and Applied Mathematics.From August 10 to 14,2015,mathematicians,scientists 相似文献