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Christine B. Tayntor 《Information Systems Management》2013,30(3):86-88
Abstract For companies faced with the need to deliver new applications more quickly and at lower costs than before, client/server computing is becoming a reality. End-user computing, although not directly involved in creating the new applications, is affected by the shift in computing architecture. 相似文献
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双私钥双随机数认证方案 总被引:2,自引:0,他引:2
计算机网络是一个开放的系统,也正是由于其开放性导致计算机网络中存在相当多的安全漏洞和安全威胁,网络中的各类资源很容易被人非法访问和复制.因此对网络资源访问者的合法身份进行认证就显得非常重要.1981年,Lamport提出了一种基于密码表的用户认证方案.此方案可以抵抗重传攻击,然而,当存储在主机的口令一旦遭到攻击者的攻击,方案将无任何安全可言.智能卡可以作为一种更有效的用以认证身份的个人持有物,许多基于智能卡的认证方案被提出.首先对Das的双线性对身份认证方案进行了详细分析,针对其存在时钟同步问题,易遭受伪造攻击等安全隐患,提出了一种基于双线性对并利用智能卡完成的交互认证方案.为防止在认证过程中被伪造攻击,提出双私钥双随机数的方法,增强了认证系统的安全性,可安全地完成用户和远程系统间的交互认证. 相似文献
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针对双膜片式微型差压传感器提出由双半桥组成一种差压全桥的桥路设计,并给出了理论推导及实测结果,且它们符合较好。并通过零位调节和满量程调节,在实际上使两个半桥的满量程相等,零位近似为零。 相似文献
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In this paper, we define double Horn functions, which are the Boolean functionsfsuch that bothfand its complement (i.e., negation)fare Horn, and investigate their semantical and computational properties. Double Horn functions embody a balanced treatment of positive and negative information in the course of the extension problem of partially defined Boolean functions (pdBfs), where a pdBf is a pair (T, F) of disjoint setsT, F⊆{0, 1}nof true and false vectors, respectively, and an extension of (T, F) is a Boolean functionfthat is compatible withTandF. We derive syntactic and semantic characterizations of double Horn functions, and determine the number of such functions. The characterizations are then exploited to give polynomial time algorithms (i) that recognize double Horn functions from Horn DNFs (disjunctive normal forms), and (ii) that compute the prime DNF from an arbitrary formula, as well as its complement and its dual. Furthermore, we consider the problem of determining a double Horn extension of a given pdBf. We describe a polynomial time algorithm for this problem and moreover an algorithm that enumerates all double Horn extensions of a pdBf with polynomial delay. However, finding a shortest double Horn extension (in terms of the size of a formula?representing it) is shown to be intractable. 相似文献
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石燕 《计算机光盘软件与应用》2005,(8):94-97
出于对影像共同的理解和喜好,项砚冬和汤一虎在2000开始实验电影《殒云》的创作,同年成立了日蚀影像。“日蚀”源于项砚冬94年想组建的重金属乐队,并将这一名称用于实验电影的片头,而“劳动”则是对工作室严谨专业的工作作风及文化理念的最好阐释。 相似文献
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针对局部方向数(Local Directional Number pattern,LDN)类方法的人脸识别通常仅利用梯度信息且信息提取不充分的问题,提出双偏差双空间局部方向模式(Double Variation and Double Space Local Directional Pattern,DVDSLDP).该方... 相似文献
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The single bootstrap already is popular in economics, though the double bootstrap has better convergence properties. We discuss the theory and implementation of the double bootstrap, both with and without the pivotal transformation, and give detailed examples of each. One example is a nonlinear double bootstrap of a Cobb-Douglas production function, and explains the use of Gauss-Newton Regressions as a device to decrease computational time. Another example is double bootstrapping elasticities from a translog production function. 相似文献
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Walter A. Burkhard 《Information Processing Letters》2005,96(5):162-166
Double hashing with bucket capacity one is augmented with multiple passbits to obtain significant reduction to unsuccessful search lengths. This improves the analysis of Martini et al. [P.M. Martini, W.A. Burkhard, Double hashing with multiple passbits, Internat. J. Found. Theoret. Comput. Sci. 14 (6) (2003) 1165-1188] by providing a closed form expression for the expected unsuccessful search lengths. 相似文献
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双算子形态学滤波器 总被引:1,自引:0,他引:1
传统的形态学滤波算子交替性差、耗时长且抑制噪声能力弱. 基于中心互补结构元素与交替对偶算子, 提出了双算子形态学滤波器. 该滤波器继承了经典形态学滤波器的递增性、对偶性和幂等性, 但不满足扩展性和非扩展性. 双算子形态学滤波器具有离散的邻域运算特性, 采用交替小结构元素能去除较结构元素大的噪声块, 且在抑制噪声的同时有效保留了图像细节. 实验结果表明, 与基本的形态学滤波器及目前已改进的形态学滤波器相比, 双算子形态学滤波器具有更强的噪声抑制性能, 且在同等滤波效果下, 其计算量更小, 最终滤波后的图像具有较高的峰值信噪比和较小的均方根误差. 相似文献
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《Theoretical computer science》2001,250(1-2):247-264
Every context-free grammar can be transformed into one in double Greibach operator form, that satisfies both double Greibach form and operator form. Examination of the expressive power of various well-known subclasses of context-free grammars in double Greibach and/or operator form yields an extended hierarchy of language classes. Basic decision properties such as equivalence can be stated in stronger forms via new classes of languages in this hierarchy. 相似文献
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为了应对冯·诺依曼计算架构的存储墙,存内计算(CIM)架构将逻辑嵌入到存储器中,在读取数据的同时完成运算,使存储单元具备计算能力并且减少了处理器和存储器之间的数据传输.为实现大容量、低成本存储器设计,提出了一种以双字线双阈值4T SRAM为基础的存储系统,不仅可实现数据的存储与读取,而且还可实现BCAM运算和与、或非、异或等逻辑运算.逻辑运算时,经译码电路任选两行存储数据,位线均预放电至低电平,位线电压通过位线端灵敏放大器与参考电压比较后输出运算结果.BCAM运算时,外部输入数据经译码电路译码后实现对存储单元左右传输管的开、断控制,位线端灵敏放大器经或非门输出匹配结果.在65 nm CMOS工艺下对所提电路进行搭建并仿真.4T存储单元相较于6T存储单元的存储面积减少了25%,双字线4T存储结构相较于单字线4T存储结构在超大规模集成电路(VLSI)应用中读功耗可节省47%左右.BCAM运算时数据匹配最大功耗为909.72 FJ,N列的阵列运算速度在字线电压为600 mV时可达16161.6×N MB/Hz. 相似文献
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采用双电容器的结构设计了一种新型双电容式料位传感器。传感器结构简单,安装灵活,可工作在恶劣的环境中,可减小因温度和湿度造成的测量误差,可减小分布电容和寄生电容对测量结果的影响,不仅适用于金属容器,也适用于非金属容器的料位测量。 相似文献