基于Linux的入侵防御系统的研究与实现

首先分析了在Linux操作系统下入侵防御系统的三种体系结构,然后给出了一种建立入侵防御系统的具体实现,最后讨论了进一步需要研究的问题.     

CAPS导航电文格式优化及其算法

导航电文是卫星定位系统中定位计算的重要基础数据之一,导航电文编排的好坏直接关系到系统定位的准确性和定位计算的效率;针对目前CAPS导航定位系统采用的超帧、帧、子帧的固定格式带来的灵活性和效率上的不足,设计了一种改进的基于数据类型分类的电文帧格式,并提出了多目标遗传优化的帧长度选择算法;实验结果表明,改进的帧格式能克服固定格式的灵活性和效率问题,多目标选择算法的应用降低了帧的开销和空闲位数,具有实用价值.     

支持专业知识获取的中间件的研究

 分析了如何利用中间件技术支持专业知识获取的问题．提出了基于XML，SOAP，UDDI和WSDL的web服务技术的专业知识获取的中间件应用模式，它可以有效解决消息传送、服务功能的抽象描述以及服务在网络上的发布与发现等问题。以固定瓦推力滑动轴承的性能参数计算Web服务为实例，指出web服务是分布式设计知识获取和知识资源集成的有效途径．     

Direct synthesis of pseudo-random ternary perturbation signals with harmonic multiples of two and three suppressed

This paper proposes an analytical method to directly synthesise pseudo-random ternary perturbation signals for the identification of frequency response functions, through the multiplication of two components signals which satisfy a prescribed set of properties. The ternary signals generated have harmonic multiples of two and three suppressed; this specification is useful for reducing the effects of nonlinear distortion on the linear estimate. The signals have uniform magnitude in all, except two, of the nonzero harmonics. The method is significant in overcoming the existing problem of sparsity in the available periods when analytical methods are used, as well as the relatively long computational time required in approaches based on exhaustive search or computer optimisation. The proposed technique presents a breakthrough as it eliminates the sequence-to-signal conversion stage required in the existing conventional methods. A direct consequence is the increased signal power within amplitude constraints, which now equals the theoretical limit for the specification considered. If it is necessary to further increase the number of available periods, the mathematical derivation can be extended to a class of suboptimal direct synthesis signals; however, these possess reduced signal power compared with direct synthesis signals.     

浅论书法与绘画的关系

书法与绘画的关系,一直就有书画同源的说法,中国的书法和绘画都是圆锥形的毛笔用墨在纸或绢上用线条画出.文人画重视对笔墨的追求,旨在于突出绘画中用笔本身的独立审美价值,这又与书法艺术重视用笔不谋而合,或者应该说其绘画用笔正来自书法用笔的灵感.笔墨不只是一种技能,更是一种精神.这种精神的载体,就是书画同源的中国文人画.     

CFD Modeling and Analysis of The Flow,Heat Transfer and Mass Transfer in a Blast Furnace Hearth

Understanding the complex phenomena in the BF hearth is essential to increasing furnace productivity and to extending furnace campaign. Numerical modeling provides a cost‐effective tool to obtain such knowledge. We have developed several continuum‐based mathematical/numerical models to simulate the flow, heat transfer and mass transfer in the lower part of BF and in the hearth. These models have generated an improved insight into the mechanisms for liquid drainage efficiency, lining erosion and wall protection in BF hearth under operational conditions. The current paper provides an overview of these studies, as well as dealing with three specific aspects: (a) Gas flow and pressure on the liquid surface, and its effect on the drainage characteristics; (b) Flow and temperature distributions of liquid iron in the hearth, and the temperature distribution in the refractories; and (c), Titania injection to form Ti(C,N)‐rich scaffolds on the hearth refractory surface, to protect the hearth from erosion.     

均衡化特征匹配的非刚体细胞形态跟踪

提出利用均衡化特征匹配来进行非刚性细胞形体跟踪的方法。采用重启动的随机游走方法建立并求解特征匹配概率模型,利用双向均衡方法对匹配邻接矩阵进行均衡化处理,得到指定目标与待跟踪目标之间的精确匹配,以获得目标的定位跟踪结果。同时利用特征匹配结果进行目标的自动标定,并应用图像分割方法进行目标的精确轮廓跟踪。实验结果表明,将该方法应用于视频中动态背景下的运动细胞形态跟踪时,在背景相似度较高及目标迅速移动的条件下,表现出了良好的性能,与同类方法相比可获得较高的定位精度以及更为准确的目标轮廓。     

澳大利亚职业技术教育的核心与特色

介绍澳大利亚职业技术教育 (TechnicalandFurtherEducation ,简称TAFE)的核心与特色。     

Nano-AlN particle reinforced Mg composites: microstructural and mechanical properties

In this study, nano-AlN particles were introduced into pure Mg matrix through the powder metallurgy technique incorporating microwave assisted two-directional sintering followed by hot extrusion. The effect of varying volume fraction of nano-AlN addition on the microstructural and mechanical properties of pure Mg was investigated. Microstructural characterisation revealed marginal grain refinement due to the fairly uniform distribution of AlN nano-particulates. X-ray diffraction results indicated basal texture weakening in Mg/0·2AlN composite. Tensile property measurements revealed an overall increase in strength properties and ductility. Among the developed composites, Mg/0·8AlN displayed superior strength (～30% improvement) and Mg/0·2AlN showed enhanced ductility (～80% enhancement). Under compressive loading, the developed Mg/AlN nanocomposite formulations exhibited improved strength properties without significant effect on compressibility.     

基于商业综合体中复合需求的动线策略研究

本文首先探讨综合体模式下的商业混合趋势及其对设计的影响．并归纳多样商业形态组合的一些基本特点,在分析CCDI三个正在实施的工程实例的基础上,提出三种能够产生更多富于设计价值的空间的动线连接策略。