基于OSGi的Eclipse的核心事件投递模型剖析与应用

在OSGi服务平台中,服务的注销会使和该服务相关联的ServiceReference引用和服务引用过时,过时的ServiceReference引用和服务引用会带来许多问题.但服务什么时候被注销,无法预先知道,且无普遍实用的判定ServiceReference引用和服务引用是否过时的算法.本文通过对OSGi服务平台核心事件的产生和投递过程深入细致的分析,提出了判定ServiceReference引用和服务引用是否过时的方案.     

球面模型的逼近与数据压缩及推广

提出了一种三维物体表面的逼近表示与数据压缩方法.该方法可以在不增加表示物体表面的数据量(例如面片数量)的情况下,使逼近误差降低约1/2;在逼近误差不变的情况下,使表示物体表面的数据量大幅下降.提出了用与最基本的三维物体--球体表面相交的面片来表示球面的方法,将该方法扩展到了一般曲面.理论分析与实验数据表明,新算法与传统方法相比,其数据压缩比约为35%.该研究在虚拟现实技术和三维模型的数据压缩及传输等领域有较重要的学术及应用价值.     

Windows与Linux互操作研究

研究了如何在Windows与Linux这两种最流行的操作系统之间进行互操作:在单机情况下,共存于同一机器的Windows与Linux如何互访文件系统,利用模拟器软件运行各操作系统下的应用程序;在网络情况下,运行不同操作系统的计算机如何共享文件与打印机;如何利用虚拟机软件运行另一操作系统下的应用程序.并简要分析比较了所用到的软件工具的机理及安装与使用方法.     

走"多元化"及"专业化"之路--智诚科技2005年年度用户大会侧记

紧随SolidWorks公司2005年用户大会,老牌SolidWorks代理商智诚科技也于2005年7月在香港、广州和深圳召开了年度用户大会.本次盛会吸引了近200名来自深圳、东莞、惠州及香港等地的工程师参加,智诚科技及其合作伙伴在会上除向与会嘉宾介绍MoldOffice、3DQuickPress和SolidCAM外,还隆重推介了SolidWorks 2006和COSMOS 2006.记者亲历本次深圳盛会,并在参会期间,同智诚科技有限公司总经理Kelvin Chong荘敏先生及其合作伙伴、用户进行了深入交流,从不同侧面了解他们对SolidWorks及智诚科技的看法.     

工业和信息化部全力支援地震灾区

本刊讯 北京时间5月12日14时28分,四川阿坝州汶川县(北纬31度,东经103.4度)发生了8.0级地震.本次地震具有强度大、影响面广、破坏严重等特点,强烈的地震造成灾区道路受阻、电力中断、通信线路和设施损毁,致使四川、甘肃、重庆、陕西等省(市)部分地区的通信不同程度的受损.     

基于ARM嵌入式IPCamera的设计与实现

如何设计一款能够通过网络实现远程拍照和浏览照片的IPCamera?本文通过采用ARM9和USB摄像头实现IPCamera.IPCamera使用S3C2410、AX88796等元件来组成硬件平台,再将Linux系统移植到硬件平台上,然后设计好相应的驱动程序和应用程序,最后将软件下栽到硬件平台.     

彻底删除Vista不留任何系统信息

很多用户都选择了Windwos XP和Windows Vista组成双系统,这样的方式一来可以很好地体验Vista,二来也可以随时切换到XP系统下完成Vista系统下"不可能完成的任务". 笔者就是遵循了上述想法安装了双系统,可是在格式化Vista所在分区重启机器时出现了一个问题(如图1).我明明在格式化后将C盘(XP所在分区)根目录下的"boot.ini"文件做了修改,为什么还会出现这样的情况呢?     

基于IP数据业务的计费系统模型的探究

计费系统的模型是计费系统的核心组成部分,计费系统模型的性能直接影响到计费系统的性能.本文针对现有计费系统模型的弊端,提出一个新的模型.经实验证明此新的模型支持新的费率,支持扩展,而且更加的灵活,更加的稳定,并且具有一定的通用性.     

GLCM based extraction of flame image texture features and KPCA-GLVQ recognition method for rotary kiln combustion working conditions

According to the pulverized coal combustion flame image texture features of the rotary-kiln oxide pellets sintering process,a combustion working condition recognition method based on the generalized learning vector(GLVQ) neural network is proposed.Firstly,the numerical flame image is analyzed to extract texture features,such as energy,entropy and inertia,based on grey-level co-occurrence matrix(GLCM) to provide qualitative information on the changes in the visual appearance of the flame.Then the kernel principal component analysis(KPCA) method is adopted to deduct the input vector with high dimensionality so as to reduce the GLVQ target dimension and network scale greatly.Finally,the GLVQ neural network is trained by using the normalized texture feature data.The test results show that the proposed KPCA-GLVQ classifer has an excellent performance on training speed and correct recognition rate,and it meets the requirement for real-time combustion working condition recognition for the rotary kiln process.     

做个有责任心的行业领跑者 --芬兰VTI公司总裁Hannu Martola先生采访实录

本刊记者:您好,可能许多中国的读者还不太了解VTI公司,希望您能简单介绍介绍一下VTI公司的情况.Hannu Martola先生:VTI公司是世界知名的运动和压力传感器生产公司,尤其在车用加速度计方面,VTI更是全球领先的供应商.VTI公司的产品共有13大系列,包括了各种用于测量加速度、震动、摆动及倾角的传感器,测量的范围从±0.5g到±12g,应用领域遍及了汽车、测量仪器、医疗器械、运动和健身器械以及惯性导航系统.在2004年,公司的净销售额已达到六千二百万欧元.目前,除了在芬兰的公司总部外,VTI在德国、美国和日本设有负责销售的市场运作的分公司,并在墨西哥设有生产分基地.     

模型相关时变时滞马尔可夫跳变系统低保守稳定性

本文研究了时变时滞与模型相关的随机马尔可夫跳变系统的时滞相关稳定性问题. 通过建立时变时滞与模型相关的系统模型, 构造不同的Lyapunov-Krasovskii函数, 并通过引入改进的积分等式, 以线性矩阵不等式的形式提出了具有较小保守性的时滞依赖稳定性条件. 最后用几个数值算例说明本文结论的有效性及较低的保守性.     

Delay‐dependent stability criterion and H∞ analysis for Markovian jump systems with time‐varying delays

This paper deals with the problems of stochastic stability and H_∞ analysis for Markovian jump linear systems with time‐varying delays. In terms of linear matrix inequalities, a less conservative delay‐dependent stability criterion for Markovian jump systems is proposed by constructing a different Lyapunov‐Krasovskii functional and introducing improved integral‐equalities approach, and a sufficient condition is derived from the H_∞ performance. Numerical examples are provided to demonstrate the efficiency and reduced conservatism of the results in this paper. Copyright © 2010 John Wiley and Sons Asia Pte Ltd and Chinese Automatic Control Society     

Stability analysis and stabilization of Markovian jump systems with time‐varying delay and uncertain transition information

The paper investigates the problems of stability and stabilization of Markovian jump systems with time‐varying delays and uncertain transition rates matrix. First, the stochastic scaled small‐gain theorem is introduced to analyze the stability of the Markovian jump system. Then, a new stability criterion is proposed by using a new Lyapunov‐Krasovskii functional combined with Wirtinger‐based integral inequality. The proposed stability condition is demonstrated to be less conservative than other existing results. The merit of the proposed approach lies in its reduced conservatism, which is made possible by a new precise triangle inequality and a new Lyapunov‐Krasovskii functional. Moreover, a controller design criterion is presented according to the stability criterion. Furthermore, the transition rate matrix is treated as partially known and with uncertainty, and the relevant stability and stabilization criteria are proposed. Finally, 3 numerical examples are provided to illustrate the superior result of the stability criteria and the effectiveness of the proposed controller design method.     

Stability and dissipativity analysis for uncertain Markovian jump systems with random delays via new approach

This paper studies the problem of stability and dissipativity analysis for uncertain Markovian jump systems (UMJSs) with random time-varying delays. Based on the auxiliary function-based integral inequality (AFBII) and with the help of some mathematical tools, a new double integral inequality (NDII) is developed. Then, to show the efficiency of the proposed inequality, a suitable Lyapunov-Krasovskii functional (LKF) is constructed with augmented delay-dependent terms. By employing integral inequalities, new delay-dependent sufficient conditions are derived in terms of linear matrix inequalities (LMIs). Finally, illustrative examples are given to show the effectiveness and less conservatism of the results.     

Delay-dependent stability analysis for discrete-time singular Markovian jump systems with time-varying delay

This article considers the problem of delay-dependent stability analysis for a class of discrete-time singular systems with Markovian jump and time-varying delay. The transition probabilities in Markov chain are assumed to be partially unknown. In terms of linear matrix inequality approach, the delay-dependent criteria are proposed to ensure the underlying system to be regular, causal and stochastically stable. Several numerical examples are given to demonstrate the effectiveness and less conservatism of the obtained results.     

Stabilization for Markovian jump systems with partial information on transition probability based on free-connection weighting matrices

This paper focuses on stability and stabilization for a class of continuous-time Markovian jump systems with partial information on transition probability. The free-connection weighting matrix method is proposed to obtain a less conservative stability criterion of Markovian jump systems with partly unknown transition probability or completely unknown transition probability. As a result, a sufficient condition for the state feedback controller design is derived in terms of linear matrix inequalities. Finally, numerical examples are given to illustrate the effectiveness and the merits of the proposed method.     

Stability and stabilisation of Itô stochastic systems with piecewise homogeneous Markov jumps

This paper focuses on the problem of stability and stabilisation for continuous-time Itô stochastic Markovian jump linear systems with time-varying transition rates. The time-varying property of the transition rates is considered to be finite piecewise homogeneous. Firstly, the stability conditions of the piecewise homogeneous Itô stochastic Markovian jump linear systems are given in terms of linear matrix inequalities (LMIs). Especially, a novel stability criterion is developed for the considered systems by the existence of the unique positive-definite solution of the corresponding coupled Lyapunov matrix equations. Secondly, two state-feedback controllers are designed via LMIs to stabilise the systems. Finally, a practical example is provided to illustrate the effectiveness of the presented theoretical results.     

Robust stability and H-infinity control for uncertain discrete-time Markovian jump singular systems

The robust stability and stabilization, and H-infinity control problems for discrete-time Markovian jump singular systems with parameter uncertainties are discussed. Based on the restricted system equivalent （r.s.e.） transformation and by introducing new state vectors, the singular system is transformed into a discrete-time Markovian jump standard linear system, and the linear matrix inequality （LMI） conditions for the discrete-time Markovian jump singular systems to be regular, causal, stochastically stable, and stochastically stable with 7- disturbance attenuation are obtained, respectively. With these conditions, the robust state feedback stochastic stabilization problem and H-infinity control problem are solved, and the LMI conditions are obtained. A numerical example illustrates the effectiveness of the method given in the oaoer.     

Robust stability and H-infinity control for uncertain discrete-time Markovian jump singular systems

The robust stability and stabilization, and H-infinity control problems for discrete-time Markovian jump singular systems with parameter uncertainties are discussed. Based on the restricted system equivalent (r.s.e.) transformation and by introducing new state vectors, the singular system is transformed into a discrete-time Markovian jump standard linear system, and the linear matrix inequality (LMI) conditions for the discrete-time Markovian jump singular systems to be regular, causal, stochastically stable, and stochastically stable with °- disturbance attenuation are obtained, respectively. With these conditions, the robust state feedback stochastic stabilization problem and H-infinity control problem are solved, and the LMI conditions are obtained. A numerical example illustrates the effectiveness of the method given in the paper.     

广义马氏跳变系统在一般转移速率下的控制器设计

针对转移概率不能精确获得并且部分未知的广义马氏跳变系统, 分别讨论在模态依赖控制器和模态独立控制器条件下的系统镇定问题. 与现有结果相比, 所提研究方法具有较小的保守性, 能够有效地解决实际问题. 首先, 运用自由权矩阵方法, 得到了广义马氏跳变系统在转移速率满足上述一般条件时系统随机容许的充分条件. 在此基础上, 以线性矩阵不等式(Linear matrix inequality, LMI)的形式分别给出了模态依赖和模态独立控制器的求解条件. 最后, 通过数值算例验证设计方法的有效性和优越性.