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1.
本文主要介绍虚拟专用网的基本概念、特点,虚拟专用网的相关技术及解决方案,以及企业构建虚拟专用网的基本思路。  相似文献   

2.
本文主要介绍虚拟专用网的基本概念、特点,虚拟专用网的相关技术及解决方案,以及企业构建虚拟专用网的基本思路。  相似文献   

3.
黄勇 《计算机与网络》2005,(13):42-43,46
文章根据不同学校VPN虚拟专用网络组网的实际出发,对VPN虚拟专用网络规划及实施过程遇到的问题进行了分析,为各学校、公司之间VPN虚拟专用网络的构建提供参考。  相似文献   

4.
多重虚拟专用网MultiVPN三个解决方案使得虚拟专用网VPN枝术不断趋于成熟,在安全性等方面进展迅速。随着互联网和电子商务的快速发展MultiVPN将越来越广泛应用于网络VPN技术中。  相似文献   

5.
采用VPN技术建立虚拟业务网技术应用分析探讨   总被引:4,自引:0,他引:4  
主要阐述了VPN虚拟专用网概念,分析了VPN虚拟专用网现状及发展趋势,介绍了VPN虚拟专用网功能及特点,为政府、企事业单位应用VPN虚拟专用网提供参考。  相似文献   

6.
安全高效的SSL VPN构建方法研究   总被引:1,自引:0,他引:1  
随着互联网技术和通信需求的迅猛发展,虚拟专用网(VPN)已成为构建专用网的主要方法。与其它虚拟专用网相比,安全套接层虚拟专用网(SSL VPN)由于具有安装简单、能够进行细粒度控制等突出优点,在构建远程访问VPN(Access VPN)时得到了广泛应用。但是,SSL VPN在构建过程中也面临着安全问题和效率问题,这些问题严重制约着SSL VPN的发展。该文在对这些问题进行分析和研究的基础上,提出了全新的SSLVPN安全认证方案和网络加速方案,并推导出配置加速器数目的计算方法。  相似文献   

7.
探讨了在企业虚拟专用网中如何建设动态路由,详细介绍了两个在企业虚拟专用网中使用动态路由的实例,并讨论了在运营商虚拟专用网下如何建设企业虚拟专用网。  相似文献   

8.
虚拟专用网是Internet的一个全新的应用领域,本文介绍了虚拟专用网的概念、分类和优势。并详细介绍了虚拟专用网的相关协议。  相似文献   

9.
主动网络的可编程特性及服务质量路由算法可以为虚拟专用网的安全体系建立和服务质量保证提供基础,虚拟专用网的综合复杂应用又能更好地体现主动网络的效率和优越特性。分析了如何在主动网络上实现虚拟专用网的设计,主要包括“安全体系的构建”、“VPN服务质量路由的实现”、“主动网络中虚拟地址和密钥交换的实现”3部分的内容。  相似文献   

10.
《网络与信息》2011,25(2):28-28
随着员工队伍越来越分散和远程办公日益普及,各种规模的企业都必须要依赖虚拟专用网。虚拟专用网是一种在公共网络(通常是互联网)上的安全的专用网络。虚拟专用网允许远程办公的员工安全地访问你的网络,就像在你的公司办公桌旁一样。如果你或者你的员工经常离开办公室并且需要访问你的公司网络,虚拟专用网是在不牺牲安全的情况下提高办公效率的廉价的方法。  相似文献   

11.
The current study investigates the effects of 3D displays (shuttered display vs. polarized display). People experienced superior fidelity and brightness when they watched 2D still images on a shuttered display, rather than on a polarized display. Conversely, people experienced greater brightness when they watched 3D still images on a polarized display, rather than on a shuttered display. Second, people were able to read a smaller font or characters on a shuttered display than on a polarized display. Third, people noticed flickering on a shuttered display when they watched 3D images. Fourth, people experienced greater brightness when they watched 3D moving images on a shuttered display, rather than on a shuttered display. The perceived brightness of the screen positively correlated with enjoyment, content satisfaction, and 3DTV satisfaction when the viewers watched a 3D movie. The flickering, on the other hand, has a negative correlation with enjoyment and 3DTV satisfaction.  相似文献   

12.
The effectiveness of banner advertisements has gained considerable attention among academics and practitioners. Despite the research progress in investigating the effect of banner properties (e.g., animation and location) on user perception and behavior, there is still a very limited understanding of how the properties of a banner and the surroundings of a website on which a banner is displayed can jointly influence its effectiveness. This study used eye-tracking technology to investigate the impact of banner animation and webpage complexity on users’ attention and memory performance. The results show that, during a free browsing task, an animated banner can attract earlier, greater, and more frequent attention from users and lead to better memory performance than a static one. Similarly, a banner on a low-complexity webpage also attracts earlier and more frequent attention among users and results in better memory performance than that on a high-complexity webpage. One implication is that an animated banner or a banner on a low-complexity webpage can provide a promising means of attracting users’ attention and enhancing their memory of the banners. Moreover, this study finds an interaction effect between banner animation and webpage complexity on the time to ?rst ?xation on a banner, but not on the total numbers or duration of fixations on a banner, or users’ memory performance. The finding highlights that an animated banner on a low-complexity website can be the most effective means to shorten the time to first fixation and quickly attract users’ attention. However, it cannot be deemed the most effective in generating greater and more frequent fixations on a banner, or leading to superior user memory performance.  相似文献   

13.
We present a study on the cooperative control of two autonomous surface vehicles performing a caging and transport mission on the water surface. The two vehicles, connected to each other by means of a floating flexible rope, are required to capture a floating target from a given location, and transport it to a designated position. We focus on the coordination and control strategy to meet these requirements, and on its implementation on two under-actuated vehicles. We describe a multi-layered control architecture which achieves the goal, followed by simulation studies and field experiments with the two vehicles caging and transporting a floating target on the surface of a lake.  相似文献   

14.
Passive dynamic walking is a gait developed, partially or in whole, by the energy provided by gravity. The research on passive dynamic bipedal walking helps create an understanding of walking mechanics. Moreover, the experimental passive dynamic research provides a base to compare and validate computer simulation results. An improved kneed bipedal walking mechanism was designed and built to study the passive gait patterns. The first aim of this study is to determine the equivalency of testing a passive dynamic biped walker on a treadmill to testing on a ramp. Based on the small difference between the gait patterns measured on the two test platforms, testing on a treadmill was found equivalent to testing on a ramp. Gait measurements were then conducted on the treadmill to evaluate the effects of the treadmill inclination angle, mass distribution of the biped, and the length of flat feet on the gait pattern. Results show that most of these parameters had significant effects on the step length, step period and hip velocity of the passive walker. Our experimental results are also compared with previous experimental results.  相似文献   

15.
The paper develops a unified feedback control law for n degree-of-freedom biped robots with one degree of underactuation so as to generate periodic orbits on different slopes. The periodic orbits on different slopes are produced from an original periodic orbit, which is either a natural passive limit cycle on a specific slope or a stable periodic walking gait on level ground generated with active control. First, inspired by the controlled symmetries approach, a general result on gait generation on different slopes based on a periodic orbit on a specific slope is obtained. Second, the time-scaling control approach is integrated to reproduce geometrically same periodic orbits for biped robots with one degree of underactuation. The degree of underactuation is compensated by one degree-of-freedom in the temporal evolution that scales the original periodic orbit. Necessary and sufficient conditions are investigated for the existence and stability properties of periodic orbits on different slopes with the proposed control law. Finally, the proposed approach is illustrated by two kinds of underactuated biped robots: one has a passive gait on a specific ground slope and the other does not have a natural passive gait.  相似文献   

16.
A low cost and low temperature thin film packaging process based on the transfer of an electroplated Nickel 3D cap is proposed. This process is based on adhesion control of a thick molded cap Ni film on the carrier wafer by using a plasma deposited fluorocarbon film, on mechanical debonding and on adhesive bonding of the microcaps on the host wafer with BCB sealing rings. Mechanical characterizations show that the transferred microcaps have a high stiffness, a low stress and a high adhesion. Because this process is simple and only involves a low temperature (250°C) heating of the host wafer, it is highly versatile and suitable for the encapsulation of micro and nano devices, circuits and systems elaborated on a large range of substrate materials.  相似文献   

17.
Given a cross field over a triangulated surface we present a practical and robust method to compute a field aligned coarse quad layout over the surface. The method works directly on a triangle mesh without requiring any parametrization and it is based on a new technique for tracing field‐coherent geodesic paths directly on a triangle mesh, and on a new relaxed formulation of a binary LP problem, which allows us to extract both conforming quad layouts and coarser layouts containing t‐junctions. Our method is easy to implement, very robust, and, being directly based on the input cross field, it is able to generate better aligned layouts, even with complicated fields containing many singularities. We show results on a number of datasets and comparisons with state‐of‐the‐art methods.  相似文献   

18.
The author obtains two solutions for the uncertainty problem in a multistep decision-making problem for a wide class of preference choice rules in a decision-making system. They are based on the principles of guaranteed and best results, respectively, with the criteria in the form of preferences on decisions defined by an explicitly specified utility function, which parametrically depends on a convex statistical regularity on the set of states and on the utility function on the consequences, which is determined to within a positive linear transformation.  相似文献   

19.
Abstract In this paper we develop techniques for computing elementwise conservative approximations of the flux on element boundaries for the continuous Galerkin method. The technique is based on computing a correction of the average normal flux on an edge or face. The correction is a jump in a piecewise constant or linear function. We derive a basic algorithm which is based on solving a global system of equations and a parallel algorithm based on solving local problems on stars. The methods work on meshes with different element types and hanging nodes. We prove existence, uniqueness, and optimal order error estimates. Lastly, we illustrate our results by a few numerical examples.  相似文献   

20.
In this work, new novel methods for fabricating a thermal probe array with 32 × 32 probes on one chip are proposed. It consists of silicon micromachined probe, AlN actuator, pyramidal SiO2 tip on which the nano-scale metal-metal junction is formed using a self-alignment technique. The nano-junction can be used as a thermocouple to measure a local temperature on a sample surface or as a nano-heater to make a local deformation on a media. Using the fabricated thermal probe, temperature distribution is measured on a prepared sample surface and the local heating capability of the thermal probe is confirmed. Preliminary experiments for data writing and reading are performed on a phase change medium  相似文献   

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