共查询到20条相似文献,搜索用时 156 毫秒
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RIP路由协议及其漏洞攻击防范 总被引:2,自引:0,他引:2
本文对RIP协议的基本工作原理、RIP协议的特点,RIP协议的不足之处等基本理论作了科学的阐述。在此基础上指出了边界网关协议存在的缺陷,并对可能存在的漏洞攻击及其防范措施进行了分析。 相似文献
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针对Web安全协议SSL的握手协议部分进行了详尽的阐述,对其安全性作了一定的分析,给出了理论上存在的三个协议漏洞的详尽描述,并且经过测试验证,指出了SSL协议存在***模式漏洞。 相似文献
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张广胜 《计算机工程与应用》2003,39(30):158-161
形式化分析方法由于其精炼、简洁和无二义性逐步成为分析密码协议的一条可靠和准确的途径,但是密码协议的形式化分析研究目前还不够深入,针对这一现状,该文提出用时延Petri网来表示和分析密码协议。该模型不但能够反映协议的静态和动态的特性,而且能够对密码协议进行时间、空间上的性能评估。作为实例,文章对MSR无线协议作了详细的形式分析和性能评估。最后,与其它形式化分析密码协议的方法作了比较。 相似文献
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因特网密钥交换协议的应用研究 总被引:1,自引:0,他引:1
贺建伟 《电脑编程技巧与维护》2009,(24):71-72
介绍IPSec协议,包括IKE协议的安全体系结构、安全策略和IKE协议的不足,重点研究了主模式下预共享密钥认证-仅支持固定IP用户的不足,对协议作了相应改进以支持动态IP。 相似文献
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《Computer Graphics and Applications, IEEE》2000,20(5):76-84
I consider the chemistry, physics, and computer graphics of soap bubbles. I focus on the physics of soap films, which are, after all, what bubbles are made of. I see what happens when soap dissolves in water and discuss some surprising properties of soap films 相似文献
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Rüdiger Zillmer Richard Wright Susan Bates Ian Mahers 《Personal and Ubiquitous Computing》2014,18(8):2057-2064
This work reports the development and evaluation of a robust and easily deployable soap use logging device. The waterproof device contains motion and sound sensors and can be fully embedded in commercial bar soap. At rest, the device is in a low-power mode and the recording of data is triggered by vibrations measured by a tilt switch. Monitoring soap usage is used to support behaviour change interventions, with the aim to reduce contact diseases. Following the algorithm development under laboratory conditions, we evaluate the performance of the logging device under free-living conditions in 58 low-income households in India. In addition to the measurement by logger soaps, washing activity was recorded by observers. These data allow us to quantify the error of soap use detection. Further, the study data are used to train and evaluate an algorithm for the discrimination of soap use associated with hand and body wash. The results show that the soap logger provides an unobtrusive and objective measure of free-living soap usage. The analysis of the activity features reveals a novel hygienic habit, which is important information for the design of bespoke interventions. 相似文献
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We present a simple and real‐time technique for animating giant realistic looking soap bubbles. Unlike small spherical soap bubbles, giant soap bubbles stretch significantly and undergo globally varying and locally consistent deformations because of time‐varying surface tensions. For physically plausible surface tensions, we introduce and combine a variable‐length mass spring system and Gibbs elasticity and Marangoni elasticity. Using a proposed framework, we deform our models because of general forces from surface tensions, winds, and excessive pressures. Our framework effectively generates a physically plausible animation of giant soap bubbles, differing in shape according to the user's design; generates capillary waves and vibrations while floating in the air; and shows vivid iridescent colors corresponding to the deformations, all of which have been difficult to achieve using previous soap bubble animation methods. Copyright © 2015 John Wiley & Sons, Ltd. 相似文献
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本文对于在J2ME平台下,利用XML解析器开发SOAP协议的基本方法进行了研究,介绍了J2ME平台和SOAP协议,其中重点探讨了XML的开发,提出了一种利用XML解析器在J2ME平台上实现SOAP协议的方法,具有一定的推广价值。 相似文献
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《Computers & Structures》2001,79(22-25):2053-2062
There exist three different lines of computational form finding methods: (i) simulation of hanging models, (ii) numerical simulation of soap films, and (iii) structural shape optimization. The aim of the present paper is to show their differences and common aspects when applied to the special task of maximizing stiffness. The inverse problem of simulation of soap films is formulated in more detail on the basis of differential geometry. The effect of internal pressure is discussed. Several illustrative examples are given. 相似文献
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《Computer aided design》1987,19(6):310-322
The use of the minimization of surface integrals of functions of the mean and Gaussian curvature to obtain smooth surfaces that satisfy given boundary and other conditions is discussed. A structural analogy based on the bending theory of shells is introduced to enable the designer to predict the effect of changing parameters in the integrals to be minimized. Surfaces of zero mean curvature (minimal or soap film surfaces), surfaces of constant mean curvature (inflated soap films, including the sphere) and the elastica (in two dimensions) are all special cases of the theory. 相似文献
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Valentina Beatini Gianni Royer-Carfagni 《Structural and Multidisciplinary Optimization》2017,55(3):885-898
Analogical physical models are a preferred technique to intuitively grasp complex engineering problems. It is well-known that the equilibrium minimal-surface configuration of membranes under equibiaxial tension can be visually represented by the surface of a soap film under equivalent boundary conditions, but this analogy fails when the stress state is not uniform equibiaxial. We extend to this situation the analogy with soap films. The equilibrium state of an orthotropically tensioned membrane is found by geometrically stretching the shape of a soap film, in a precise manner depending upon the applied state of stress. The procedure is easily done by elaborating digital pictures. The method is mathematically justified under the kinematic hypotheses of small strains and large rotations, and further verified in a parametric design environment. It can also provide an insight into the equilibrium configuration of cable-nets, when the stresses in the warp and weft directions are considerably different. Furthermore, this visualization favors implementing transformable shapes for membranes or orthogonal cable nets, as a consequence of a modification of the ratio of the principal stress components. 相似文献
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Roman urikovi 《Computer Graphics Forum》2001,20(3):67-75
What is happening when a soap bubble floats on the air? How do bubbles coalesce to form beautiful three‐dimensional clusters? The physical‐based model and animation described herein provide the answers. This paper deals with a complete computer simulation of soap bubbles from a dynamic perspective, which should prove to be of great interest to physicists and mathematicians. We discuss the dynamic formation of irregular bubble clusters and how to animate bubbles. The resulting model takes into account surface tension, film elasticity, and shape variations due to gravity and external wind forces. 相似文献
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Michele Emmer 《Nexus Network Journal》2013,15(2):227-239
Michele Emmer discusses the relations between soap films, arts, mathematics, visual arts, architecture with very recent examples. It’s because I don’t do anything, I chatter a lot, you see, it’s already a month that I’ve got into the habit of talking a lot, sitting for days on end in a corner with my brain chasing after fancies. It is perhaps something serious? No, it’s nothing serious. They are soap bubbles, pure chimeras that attract my imagination. Fedor Dostoevsky, Crime and Punishment 相似文献
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运用光滑粒子流体动力学分析方法,对钢球高速侵彻肥皂靶标进行了数值仿真分析。建立了钢球与肥皂高速撞击数值计算模型,运用侵蚀接触算法,求解了高速钢球侵彻肥皂的动力响应时间历程,获取了钢球侵彻肥皂靶标的侵彻深度与投射物速度关系图和瞬态Von—Mises等效应力云图,分析了高速碰撞过程及碰撞过程中空腔的形成和变化情况,并与实验结果及Lagrange数值仿真结果对照,计算结果具有良好精度,表明运用SPH方法能够较好地描述高速撞击现象。文中的研究表明,SPH技术是开展创伤弹道研究的有效手段。 相似文献