虚拟企业模型并行仿真研究

随着各种全新的制造理念,特别是虚拟企业的出现,企业模型的规模不断扩大,使目前存在的大多数企业模型仿真系统的效率大大下降。该文针对此问题,通过深入分析虚拟企业模型结构,并在已有的构件化企业建模体系CEMS及其仿真系统的基础上,结合异步仿真技术和多线程技术提出了一种分层式企业模型仿真体系结构,为虚拟企业模型的快速高效的仿真提供了一种有效的方法。     

Java语言及其虚拟机技术探讨

随着Internet的迅猛发展，Internet编程语言Java愈来愈成为计算机行业的焦点。本文在简述了Java的主要特点后，重点对Java最关键的技术──虚拟机进行了深入的探讨。     

Accurate Depth of Field Simulation in Real Time

We present a new post processing method of simulating depth of field based on accurate calculations of circles of confusion. Compared to previous work, our method derives actual scene depth information directly from the existing depth buffer, requires no specialized rendering passes, and allows easy integration into existing rendering applications. Our implementation uses an adaptive, two‐pass filter, producing a high quality depth of field effect that can be executed entirely on the GPU, taking advantage of the parallelism of modern graphics cards and permitting real time performance when applied to large numbers of pixels.     

Laboratory Evaluation of Smear Zone and Correlation between Permeability and Moisture Content

In this study, the extent of the smear zone and the reduction of permeability and water content within the smear zone were investigated using a large-scale consolidometer. The installation of vertical drains by means of a mandrel causes significant disturbance of the subsoil surrounding the mandrel, resulting in a smear zone. The extent of the smear zone for Moruya clay (New South Wales, Australia) was estimated on the basis of normalized permeability and the reduction of water content by taking undisturbed samples (horizontally and vertically) at different locations. This study reveals that a significant reduction in water content and horizontal permeability takes place towards the drain, whereas the variation in the vertical permeability is negligible. The smear zone for Moruya clay was found to be 2.5 times the equivalent radius of the mandrel with the horizontal permeability varying from 1.09 to 1.64, an average of 1.34 times smaller than that of the undisturbed zone. Finally, a correlation between the permeability decrease and water content reduction within smear zone is proposed.     

不同防毒技术在计算机实验室的比较研究

详细介绍杀毒软件技术和还原保护技术的特点及发展现状．从投入成本、软件系统资源占用率、功能稳定性、数据恢复效率和部署简易性等方面,对两类技术在计算机实验室内应用的适应性展开比较研究,得出还原保护技术更适合在实验室内得到大规模应用这一结论,指出它在病毒防护工作中的不足和仍需补充研究的方向。     

理工类高等院校实验室安全管理体系建设研究

实验室安全管理是理工类高等院校安全工作的重点内容．针对理工类高校实验室安全管理问题。对理工类高校实验室安全管理的特点和影响实验室安全管理的主要因素进行详细的研究和分析,并以此为基础从实验室安全管理组织体系、监督体系和保障体系三个方面提出建设理工类高等院校实验室安全管理体系的具体措施。     

惯性导航装置虚拟检测仪设计

惯性导航装置是一种很重要且精密的设备,故障检测和诊断是设备维修的前提,综合采用现在的虚拟检测技术,对惯性导航装置的故障检测方法进行了研究,设计了虚拟检测仪的硬件设备,开发了虚拟检测仪的软件,完成了整个虚拟检测仪的设计。     

Film and television industry cloud exhibition design based on 3D imaging and virtual reality

The three-dimensional virtual scene can provide users with a visual three-dimensional virtual environment, with various multimedia channels such as sound, video, force feedback equipment, etc., to bring users a completely immersive interactive experience. This paper introduces 3D imaging and virtual reality technology in the film and television industry cloud exhibition, and develops a virtual display platform. First of all, this paper divides the registration into two processes: camera calibration and joint calibration of the camera and laser scanner based on the calibration results. Camera calibration can determine the plane model of the calibration board in the camera coordinate system, and the joint calibration uses the RANSAC algorithm to extract the point cloud of the plane model of the calibration board, and then optimizes the distance between the points in the plane model point cloud and the corresponding plane in the camera coordinate system Find the optimal transformation between the two sets of data, and then calculate the registration relationship between the point cloud and the image. Secondly, this article conducts a demand analysis of the film and television industry cloud exhibition platform based on virtual reality technology, including the business goals set by the platform, platform system analysis, overall design, and system operating environment and configuration requirements. This model provides a feasible solution for the visual interaction of the cloud exhibition design of the film and television industry.     

网络虚拟服务器安全性对策研究方案

针对目前虚拟服务器的安全问题进行研究。设计了一种新的Web虚拟服务器应用安全的解决方案,在代码一级对其攻击进行检测和防护。即一方面,确定代码位置,利用特定的API调用在其前后对用户输入相关的参数进行判断是否含有可能的攻击存在并进行相应的处理;另一方面在应用源代码或中间代码文件中插入本方案的检测代码,以实现防护的功能。