基于分布式中间件ICE的应用架构研究

在分布式系统中,分布式平台之间的差异增加了开发的复杂性.基于一种轻量级的分布式中间件ICE,提出了在分布式异构环境中的一般架构模型.该模型可以降低模块之间的耦合度,解决服务器负载过大的问题.将该模型应用到网络安全管理系统中,解决了网络安全管理系统中平台差异问题和服务器负载均衡问题.     

基于ArcGIS Engine的矿井巷道三维自动建模方法的研究与实现

文章比较和分析了几种矿井巷道三维建模技术,提出了一种基于ArcGIS MultiPatch 3D数据结构的矿井巷道三维建模方法,即在C#开发环境下,结合巷道自身的特点,在ArcGIS Engine平台上进行二次开发,实现了矿井巷道的三维自动建模。该方法为矿井巷道三维信息系统的建立提供了新的解决方案。     

Lyapunov-based feedback design and experimental verification of IC engine speed control

In this paper, the speed control problem of internal combustion engines is investigated based on mean-value engine models. The dynamics of internal combustion engines is a complicated nonlinear system, and usually, it is difficult to know the exact values of the physical parameters. First, a Lyapunov-based design method is shown without requiring the full information of the physical parameters. Then, to improve transient performance, the design method is extended to several cases under different operation conditions. Numerical simulation results are presented for comparing the proposed design methods. Finally, experiments are conducted on an engine test bench and the results demonstrate the validity of the proposed design methods. Recommended by Editorial Board member Myotaeg Lim under the direction of Editor Hyun Seok Yang. The authors are grateful to Kai Zheng for his assistance of the model identification experiments. Jiangyan Zhang received the B.E. and M.E. degrees in Electrical Engineering, Yanshan University, China, in 2005 and 2008, respectively. Now, she is a Ph.D. candidate with the Department of Engineering and Applied Sciences, Sophia University, Tokyo, Japan. Her current research interests include nonlinear system control theory and applications to powertrain system control. Tielong Shen received the Ph.D. degree in Mechanical Engineering from Sophia University, Tokyo, Japan, March, 1992. From April 1992, he has been a faculty member of the Chair of Control Engineering in Department of Mechanical Engineering, Sophia University, where he currently serves as professor of the Department of Engineering and Applied Science. His research interests include control theory and application in mechanical systems, power systems, and automotive powertrain. Currently, he is an Associate Editor for the IEEE Control System Society Conference Editorial Board, and is serving as Associate Editor of Journal of Control Theory and Applications, and the Regional Editor Asia-Pacific for International Journal of Modeling, Identification and Control etc. Junichi Kako received the B.E. degree from Nagoya Institute of Technology, Nagoya, Japan. He joined Toyota Motor Corporation, Tokyo, Japan in 1989. He worked on various aspects of automotive powertrain control. From 1989 to 1994, he took part in the team for the development of Laboratory Automation (LA) system, Engineering Office Automation (EOD) system, and embedded system of powertrain control. During 1995–2001, he focused on the engine control systems in Powertrain Management Engineering Division. In 2002, he was with Future Project Division in which he was responsible for the R&D of model-based engine control system. Currently, he is developing engine control systems in the Powertrain Management Engineering Division, Toyota Motor Corporation. Shozo Yoshida received the M.S. degree in Engineering from Kyoto University, Kyoto, Japan. He joined Toyota Motor Corporation, Tokyo, Japan in 2000. From 2000 to 2004, he was with Future Project Division and worked on physical combustion modeling for Model-based Control Development. Since 2005, he has been with the Powertrain Management Engineering Division Toyota Motor Corporation, and is a member of the R&D of Model-based Engine Calibration.     

基于多核的入侵防御引擎设计与实现

本文提出了一种基于多核的入侵防御引擎的设计模型,并根据此模型实现了一款入侵防御引擎。经过测试表明,此款多核入侵防御引擎的实现与传统入侵防御引擎相比性能优异,满足高性能网络安全的需要。     

基于ArcGIS的县级林业资源管理信息系统研究

随着GIS技术的不断发展,市、县级林业局对森林资源信息化管理的需求日益增高.研究建立一个通用的县级林业资源管理信息系统具有非常重要的实用价值.ArcGIS Engine是ESRI(美国环境系统研究所)开发的嵌入式GiS.Ar-cGIS Engine提供了全面、完善的二次开发功能,并且具有与平台无关性.围绕着这些功能和特色,采用ArcGIS Engine结合SQL Server 2005数据库在.NET平台上建立了一个通用的县级林业资源管理信息系统.     

飞行器特性曲线拟合与飞行仿真研究

随着计算机技术的高速发展,计算机仿真在航空航天领域得到了广泛的应用.飞行器的计算机飞行仿真计算涉及大量气动力特性和发动机特性参数,对这些参数采用两参数和三参数的曲线拟合方法替代过去的数值插值方法,减少了输入参数的数量,大大提高了仿真程序的代码效率和仿真实时性.基于这种方法拟合发动机和飞机气动特征的特性曲线,并利用Runge-Kutta方法建立了飞行方程的数值解算程序,对某型飞机起飞-巡航-降落过程进行了数值仿真.在此基础上设计了全程可视化程序,得到了全过程的舵面控制规律,为飞行模拟器的设计提供了有效的方法和手段.     

基于Web数据挖掘的个性化搜索引擎研究综述

Web数据挖掘是将教据挖掘技术和理论应用于对WWW资源进行挖掘的一个新兴的研究领域.论述Web数据挖掘的发展现状、发展趋势以及将来可能的研究方向,并简单介绍个性化搜索引擎的一些情况,论述web教据挖掘在个性化搜索引擎中的应用.     

基于Truevision3D的虚拟现实技术

在介绍TV3D引擎的基础上重,点讨论了在Visual C#.NET中使用TV3D引擎实现虚拟现实的方法和步骤.文中采用动态摄像机,当操作键盘或鼠标来移动目标物体时,场景视角和摄像机会自动调整,很简单地就实现了虚拟漫游.实验结果表明,使用TV3D引擎来实现虚拟现实,很多底层的功能很容易实现.     

基于Web的建筑业信息搜索引擎的设计与实现

随着Web信息的急剧增长使搜索引擎专用化成为发展趋势.根据当前的需求提出了实现建筑业信息搜索引擎设计方法.重点论述主题搜索引擎的信息采集策略,并给出了一种比较理想的建筑业信息搜索引擎设计方案.     

单边限幅参与的并网VSC系统次同步振荡近似分析

针对电力电子设备引起的次同步振荡问题,现有研究集中在无法计及限幅的小信号模型分析或考虑限幅对称的近似分析,但极少考虑不对称的单边限幅的影响。针对不对称的单边d轴电流限幅(AU-d-CL,或上电流饱和限幅)参与的并网电压源换流器(voltage source converter,VSC)系统的次同步振荡现象,采用单边限幅的描述函数和广义Nyquist判据进行近似分析。具体地,首先,建立了并网VSC系统的简化模型,分析了其小扰动稳定性,并分析了AU-d-CL参与的负阻尼振荡现象。其次,给出了VSC系统的频域模型和AU-d-CL的描述函数。最后,结合AU-d-CL的描述函数和广义Nyquist判据,近似计算了不同参数和限幅值时的振荡幅值和频率,结果表明计算结果和仿真结果基本一致,可解释次同步振荡在限幅值改变时,频率基本不变,振荡幅值变化的现象。