共查询到18条相似文献，搜索用时 774 毫秒
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根据二变量基本对称函数产生器的逻辑功能，结合多β晶体管独特的结构特点，设计了元件级的二变量基本对称函数产生器，用该对称函数产生器可实现任意对称函数。 相似文献
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阈值逻辑门是一种逻辑功能很强的逻辑电路，任意线性可分离函数只要用一个单阈值逻辑门便可予以实现，本文讨论与分析了阈函数、对称函数的有关性质，指出了任意对称函数可以方便地用具有多阈值、多输出的阈门及异或门予以实现，文中给出了相应的综合程序． 相似文献
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首先对处理布尔函数的Ｗａｌｓｈ变换进行了修改，使其能应用于多输出函数ｆ（ｘ），：ＧＦ（２）＾ｎ→ＧＦ（２）＾ｍ，（１＜ｍ＜ｎ）；其次对多输出函数的退化性、线性结构、非线性性和相关免疫性等密码学性质进行了讨论。 相似文献
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针对机电专业学生对数字电路组合逻辑电路的设计比较困难,应用3线—8线CT74LS138DE译码器对电路的设计就变得很容易,用3线—8线译码器加上4输入与非门或4输入或门就可完成任意的组合逻辑电路的设计。我从3线—8线译码器基本逻辑关系入手,分析基本电路,输出的真值表及三位二进制译码器逻辑式,最小项的逻辑关系式,最后例举了两个全加器和芯片片选信号作为论证。 相似文献
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在数字逻辑电路分析、设计中，经常会遇到将逻辑函数表达式展开为最小项之和的形式。传统的方法是：若逻辑函数表达式中的某一项不以最小项形式给出，则可用基本公式“X＋X＝１”，把它展成最小项之和的形式。如果是二个变量，无论表达式以什么形式给出，根据这基本公式做起来都较简单。但如果是三个以上的变量，那就真可谓说来容易做来烦，而且非常容易出错。所以，针对上述问题，本人提出如下简便方法。设“di”为函数表达式中非最小项的项中未出现的变量，于是可用di把表达式中的非最小项构成最小项的形式。观察构成的最小项中有几个di… 相似文献
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基于液晶光阀的可编程光学二值逻辑系统张子北，刘立人（中国科学院上海光学精密机械研究所）秦伟芳（中国科学院上海技术物理研究所）摘要基于双轨编码和分束合束，本文提出一种能够实现两个二值输入变量的逻辑系统。通过控制偏振片的偏振方向，该系统能够实现所有十六种... 相似文献
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Boolean logic performs a logical operation on one or more logic input and produces a single logic output. Here, we describe a microfluidic DNA computing processor performing Boolean logic operations for gene expression analysis and gene drug synthesis. Multiple cancer-related genes were used as input molecules. Their expression levels were identified by interacting with the computing related DNA strands, which were designed according to the sequences of cancer-related genes and the suicide gene. When all the expressions of the cancer-related genes fit in with the diagnostic criteria, positive diagnosis would be confirmed and then a complete suicide gene (gene drug) could be synthesized as an output molecule. Microfluidic chip was employed as an effective platform to realize the computing process by integrating multistep biochemical reactions involving hybridization, displacement, denaturalization, and ligation. By combining the specific design of the computing related molecules and the integrated functions of the microfluidics, the microfluidic DNA computing processor is able to analyze the multiple gene expressions simultaneously and realize the corresponding gene drug synthesis with simplicity and fast speed, which demonstrates the potential of this platform for DNA computing in biomedical applications. 相似文献
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This paper investigates the adaptive fuzzy output feedback fault-tolerant tracking control problem for a class of switched uncertain nonlinear systems with unknown sensor faults. In this paper, since the sensor may suffer from an unknown constant loss scaling failure, only actual output can be used for feedback design. A failure factor is employed to represent the loss of effectiveness faults. Then, an adaptive estimation coefficient is introduced to estimate the failure factor, and a state observer based on the actual output is constructed to estimate the system states. Fuzzy logic systems are used to approximate the unknown nonlinear functions. Based on the Lyapunov function method and the backstepping technique, the proposed control scheme with average dwell time constraints can guarantee that all states of the closed-loop system are bounded and the tracking error can converge to a small neighborhood of zero. Finally, two simulation examples are given to illustrate the effectiveness of the proposed scheme. 相似文献
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本文首先证明了布尔减、布尔除与非运算构成完备集,并根据布尔减、布尔除与非运算的运算规则和性质,从与或非代数系统中的最小项、最大项展开式出发,推导了任意逻辑函数在减除非代数系统中的标准DOS(减之除)和标准SOD(除之减)展开式。最后举例说明了二个代数系统中展开式之间的转换。本文的工作对进一步完善布尔代数的四则运算理论具有一定的意义。 相似文献
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设计一种具有用途广泛、携带方便、体积小、重量轻、结构精巧、操作简单等优点的既可作为多用途信号源,又可以测量数字电路逻辑状态的测试笔。这种测试笔既具备测试输出占空比可调的脉冲波形、输出单脉冲或脉冲串、逻辑电平的多种功能,还可实现仪器功能自检。通过仿真与试验,验证明了该设计的正确性和有效性。 相似文献