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51.
52.
介绍了大同煤矿集团公司供水处处级局域网的设计原则及开发过程,对外级局域网1年来取得的管理效果、经济效益、社会效益进行了简明的阐述。 相似文献
53.
三元乙丙橡胶卷材在地下防水工程中的应用 总被引:2,自引:0,他引:2
地下防水工程既是一项系统工程,又是一项隐蔽工程,如何选择防水材料和控制工程质量显得到关重要。本文结合工程实例,介绍了三元乙丙橡胶卷材在地下防水工程中的应用,分析了三元乙丙卷材的特点,提出了地下水的技术方案,施工操作要求,质量过程控制要点和施工注意项,本文对三元乙丙卷材的工程应用具有指导和借鉴意义。 相似文献
54.
In this paper, the nonlinear response of elastic membranes with arbitrary shape under partial and full ponding loads has
been analyzed. Large deflections are considered, which result from nonlinear kinematic relations. The problem is formulated
in terms of the displacements components and the three coupled nonlinear governing equations are solved using the analog equation
method (AEM). The membrane may be prestressed either by prescribed boundary displacements or tractions. Using the concept
of the analog equation the three coupled nonlinear equations are replaced by three uncoupled Poisson's equations with fictitious
sources under the same boundary conditions. Subsequently, the fictitious sources are established using a procedure based on
the BEM and the displacement components as well as the stress resultants at any point of the membrane are evaluated from their
integral representations. In addition to the geometrical nonlinearity, the ponding problem is itself nonlinear, because the
ponding load depends on the deflection surface that it produces. Iterative schemes are developed which converge to the equilibrium
state of the membrane under the ponding loads. Several membranes are analyzed which illustrate the method and demonstrate
its efficiency and accuracy. The method has all the advantages of the pure BEM, since the discretization and integration is
limited only to the boundary.
Received 28 July 2001 相似文献
55.
本文在广义ElGamal型签名方案上建立了许多口令鉴别方案,并且提出了文[1]的三个改进方案。利用这些方案,计算机系统不仅能监测和控制口令的使用,而且可以抗击许多对口令的伪造攻击。 相似文献
56.
An effective system control method is presented for applying a three‐phase current‐source PWM converter with a deadbeat controller to active power filters (APFs). In the shunt‐type configuration, the APF is controlled such that the current drawn by the APF from the utility is equal to the current harmonics and reactive current required for the load. To attain the time‐optimal response of the APF supply current, a two‐dimensional deadbeat control scheme is applied to APF current control. Furthermore, in order to cancel both the delay in the two‐dimensional deadbeat control scheme and the delay in DSP control strategy, an Adaptive Line Enhancer (ALE) is introduced in order to predict the desired value three sampling periods ahead. ALE has another function of bringing robustness to the deadbeat control system. Due to the ALE, settling time is made short in a transient state. On the other hand, total harmonic distortion (THD) of source currents can be minimized compared to the case where ideal identification of the controlled system can be made. The experimental results obtained from the DSP‐based APF are also reported. The compensating ability of this APF is very high in accuracy and responsiveness although the modulation frequency is rather low. © 2004 Wiley Periodicals, Inc. Electr Eng Jpn, 150(1): 50–61, 2005; Published online in Wiley InterScience ( www.interscience.wiley.com ). DOI 10.1002/eej.20014 相似文献
57.
A. E. Hassanien 《Pattern Recognition and Image Analysis》2006,16(4):637-643
This paper introduces an efficient approach to protect the ownership by hiding an iris data into digital image for an authentication
purpose. It is based on the theory of wavelets. The idea is to secretly embed biometric data (iris print) in the content of
the image identifying the owner. The system is based on an empirical analysis of biometric and watermarking technologies,
and it is split into several processes. The first process is based on iris image analysis, which aids the generation of the
iris code (watermark); the second and the third processes deal with embedding and detecting a watermark; and the last process
deals with the authentication. A new metric that measures the objective quality of the image based on the detected watermark
bit is introduced, which does not require the original unmarked image for watermark detection. Simulation results show the
effectiveness and efficiency of the proposed approach.
The text was submitted by the author in English. 相似文献
58.
在Solaris环境下,利用OpenRadius架设RADIUS服务器,并结合OpenLdap,实现广电宽带城域网PPPOE用户接入认证。 相似文献
59.
60.
两个基于身份的数字签名方案的安全性改进 总被引:2,自引:0,他引:2
分析了文献[1]提出的两个基于用户身份的数字签名方案,发现其一般签名方案存在安全性缺陷,在此基础上建立了多重签名方案,但此方案也是不安全的。本文给出了改进的签名和多重签名方案。 相似文献