共查询到19条相似文献,搜索用时 62 毫秒
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为实现虚拟交通场景中的降雨实时仿真,设计出一种基于OpenGL的降雨仿真模型.现有雨的仿真模型主要关注降雨过程,而在虚拟交通环境中,通常还需要对雨滴在挡风玻璃上的运动进行仿真.利用OpenGL将场景渲染到纹理,运用几何方法计算雨滴粒子并将其映射到网格化的虚拟挡风玻璃平面,采用贴纹理的方法将纹理映射到虚拟挡风玻璃平面,建立了雨滴在挡风玻璃平面的仿真模型.实践表明,该方法的时间开销与场景、光照等因素无关,仅与车辆挡风玻璃上的雨滴数量相关.该方法在普通PC实验平台上渲染场景的帧速率超过25帧/秒,能够成功实现雨滴的实时仿真. 相似文献
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本文以我校交通信息与控制虚拟仿真实验教学中心的建设为例,按照统筹规划和优势提升的思路,构筑了专业基础课程、行业特色项目、前沿技术专题三个层次的虚拟仿真实验教学资源,形成了"先虚后实、以虚辅实、虚实结合"的创新型人才培养实验教学体系,从而提高了人才培养质量,提升了专业水平. 相似文献
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伴随着信息时代的到来与虚拟仿真行业的发展,虚拟仿真软件得到运用与完善。文章阐述了虚拟仿真软件的应用优势,也就计算机网络实验环境下,虚拟仿真软件应用实例及完善策略展开论述。 相似文献
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综合考虑各种体系对抗条件下的雷达作战环境,建立一套良好的开放式仿真系统.将虚拟战场环境数据引入到雷达仿真系统中,分析了各种外部环境与雷达系统的交互关系以及雷达系统的工作机制,从基于虚拟战场环境的实时动态视景数据库中调度大面积地形数据并进行分析处理,以此为依据来模拟机载雷达的工作过程. 相似文献
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三维虚拟仿真研究框架 总被引:2,自引:0,他引:2
仿真平台建立的目标是为了更加方便快捷地管理事务,得到科学的结论,包括各类信息的统计分析和各种规律的模拟计算,最终做出合理的决策,例如通航管理、防洪决策等.主要探索构建三维仿真平台的总体框架,并对平台所涉及的各项关键技术进行了研究. 相似文献
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交通信号控制虚拟实验平台设计 总被引:1,自引:0,他引:1
介绍了一种全新的交通信号控制虚拟实验平台,提出了以数据库为基础、通过网络实现的交通信号控制虚拟实验室的软件架构,并探讨了系统开发中的技术实现。 相似文献
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Mian Muhammad Mubasher Syed Waqar Jaffry Muhammad Murtaza Yousaf Imran Sarwar Bajwa Shahzad Sarwar Laeeq Aslam 《International Journal of Communication Systems》2019,32(13)
Globally, urbanization has increased due to the availability of the facilities, jobs, and better standard of living in cities. Increase in urban population has caused increase in urban commute. The increased pressure on urban settlements has made design and optimization of urban civil infrastructure very challenging especially road transport infrastructure. Domain experts such as transportation managers, engineers, scientist, and academics need effective, easy, and readily usable computational modeling and simulation tools to conduct systematic inquiry for design and optimization of the transportation system. Free and open‐source software (FOSS) community has developed many vehicular traffic simulation software that are cost‐effective and extensible, however are difficult to use. Usually, domain experts do not have hands‐on software skills such as XML‐based interfaces, software source versioning, and build management. To bridge this gap, in our work, an integrated development environment (IDE), namely, integrated vehicular traffic simulation environment (ITE), has been developed. ITE is developed on top of an existing FOSS multimodal open‐source vehicular‐traffic simulator (MovSim). ITE includes a scenario building tool for domain experts. It could be used to model road infrastructure and vehicular traffic in an integrated manner. The tool could be used to build and experiment novel traffic infrastructures and policies. Our work helps in reducing learning curve of domain experts by providing a free and open source, easy and readily usable vehicular traffic simulation tool. 相似文献
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安全厂商普遍使用虚拟环境来分析恶意软件,但是很多恶意软件都使用了检测虚拟机的技术来对抗对其的分析。文章介绍了3种主要的检测虚拟环境方法,给出了相应的对抗措施来防止对虚拟环境的检测。设计了一种新的基于性能比较的检查虚拟机和模拟器的方法,实验结果表明,该方法能够有效地检测出虚拟机和模拟器,如VMware软件和模拟器Qemu。 相似文献
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提出了一种基于虚拟突发光突发交换的(OBS)网络业务疏导机制TG-VB(traffic grooming based on virtual burst)。作为一种多粒度动态业务疏导机制,TG-VB将常规突发通过"逻辑汇聚"组成虚拟突发,增大核心网中业务传输粒度;同时,TG-VB根据虚拟突发整体传输、整体调度的特点,为汇聚的常规突发动态地选择最优的共用传输路径。仿真结果表明,与采用传统疏导机制的OBS网络相比,TG-VB能够有效地减轻核心节点的通信处理开销,降低对网络节点端口数量的需求;在相同负载条件下,TG-VB可极大地提高波长信道利用率。 相似文献
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Traffic streams with differing service requirements, sharing a single contract for use of a policed virtual path in an ATM network, may be jointly shaped to make the best use of bandwidth available in the path. The shaper may use the information about the network policer to perform self-policing with a form of priority service to ensure satisfactory levels of cell loss and delay for both real-time and non-real-time traffic. Two such shapers are considered assuming a mean bit-rate contract with the network in which a leaky-bucket mechanism performs the policing function. The performance of the shapers is analysed using Markov-modulated models of bursty traffic sources and stochastic fluid methods, and the analytical results are corroborated by simulations. The choice of the shaper type and optimization of the shaper design parameters are discussed using correlated and non-correlated source models. 相似文献
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Nianfei Zhan Chaoqin Gan Wei Lin Yaqin Guo Pengfei Liu 《International Journal of Communication Systems》2020,33(8)
In this paper, a mode transformation algorithm based on traffic prediction in virtual multiple optical line terminal (OLT) passive optical network (PON) is proposed. By proposing exponential smoothing algorithm based on weight update (WU‐ESA), user traffic is predicted well. WU‐ESA is a combination of two algorithms: exponential smoothing algorithm (ESA) and genetic algorithm (GA). The weight in ESA is optimized by GA based on real‐number encoding. By setting two periods, GA part and ESA part can be separated effectively. By presenting elastic packing algorithm (EPA), the load balance problem in virtual multi‐OLT PON is solved. EPA is implemented based on WU‐ESA. By the simulation and analysis, the effectiveness of the proposed algorithms is demonstrated. Compared with traditional mode transformation algorithm, EPA shows good performances in delay, throughput, and packet loss. Compared with traditional mode transformation algorithm, the EPA makes the packet loss decrease by at least 5% when the system load is greater than 0.9. Meanwhile, the delay of the two subsystems can be kept at a relatively balanced level by the implement of EPA. For throughput, the use of EPA improves the throughput by 20% when the system load is high. 相似文献
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随着时代的不断发展,人们生活水平越来越高,至2013年底,据不完全统计,我国机动车数量约为3亿辆,这一情况给我过交通系统带来了巨大的挑战。政府部门面对这一情况,想通过扩宽道路、加大道路修建以及诸多高科技手段来减轻交通方面的压力,但是这些方式只能缓解一时之急,却不是长久之计。笔者认为,通过控制交通信号灯来改善目前机动车给交通系统带来的压力,才是解决该问题长久有效的方法。 相似文献