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排序方式: 共有55条查询结果,搜索用时 15 毫秒
1.
针对采用第三变量两变量值的交换占用多余内存的不足,提出算术运算法、布尔型变量的交换法、异或运算法和异或运算取反法等4个免用第三个临时变量的两变量值交换方法,并分析这些方法的优缺点。关键词:变量交换第三变量异或运算 相似文献
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利用Pcomm Pro软件,在VB6中实现PC与PLC的实时通讯。在探讨PC与PLC的自由口通讯协议、通讯的实现方法以及传输数据的校验、错误的处理等的基础上,编写了实时通讯程序,并应用到跳汰机控制系统中。 相似文献
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姚春梅 《湖南文理学院学报(自然科学版)》2002,14(3):33-35
提出一种利用纯的高维两粒子纠缠态实现概率量子密集编码的方案。首先 ,讨论操纵纯的三维纠缠粒子对实现传送至多 2trits信息的量子密集编码方法 ,然后 ,将该方法推广到高维纠缠粒子对的情形 相似文献
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A new image fusion encryption algorithm based on image fusion and DNA sequence operation and hyper-chaotic system is presented. Firstly, two DNA sequences matrices are obtained by encoding the original image and the key image. Secondly, using the chaotic sequences generated by Chen's hyper-chaotic maps to scramble the locations of elements from the DNA sequence matrix which generated form original image. Thirdly, XOR the scrambled DNA matrix and the random DNA matrix by using DNA sequence addition operation. At last, decoding the DNA sequence matrix, we will get the encrypted image. The simulation experimental results and security analysis show that our algorithm not only has good encryption effect, but also has the ability of resisting exhaustive attack and statistical attack. 相似文献
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XOR-based Visual Cryptography Schemes 总被引:2,自引:0,他引:2
P.?TuylsEmail author H.?D.?L.?Hollmann J.?H.?Van?Lint L.?Tolhuizen 《Designs, Codes and Cryptography》2005,37(1):169-186
A recent publication introduced a Visual Crypto (VC) system, based on the polarisation of light. This VC system has goodresolution, contrast and colour properties.Mathematically, the VC system is described by the XOR operation (modulo two addition). In this paper we investigate Threshold Visual Secret Sharing schemes associated to XOR-based VC systems. Firstly, we show that n out of n schemes with optimal resolution and contrast exist, and that (2,n) schemes are equivalent to binary codes. It turns out that these schemes have much better resolution than their OR-based counterparts. Secondly, we provide two explicit constructions for general k out of n schemes. Finally, we derive bounds on the contrast and resolution of XOR-based schemes. It follows from these bounds that for k<n, the contrast is strictly smaller than one. Moreover, the bounds imply that XOR-based k out of n schemes for even k are fundamentally different from those for odd k.AMS Classification: 94A60 相似文献
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We present an integrated Silicon-on-Insulator (SOI) based Mach-Zehnder interferometer (MZI) in order to perform ultrafast all-optical XOR logic gate operation with a bit rate of ∼ 0.33 Tb/s. A numerical simulation is carried out in order to study various parameters such as extinction ratio and eye-opening parameters, characterizing the performance of the XOR logic gate. The output XOR logic gate signal can have improved extinction and eye margin if the initial powers of primary signals and the probe continuous-wave (CW), and SOI waveguide length are judiciously adjusted. 相似文献
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提出了一种基于图论理论的新的非线性人工神经网络存储器模型—自联想映射存储器。该存储器借助一种特殊的矩阵逻辑异或(XOR)运算和存储器结构,可以实现大容量信息的动态存储和自联想记忆功能,具有结构简单,存储容量大和良好的动态特性,是一种理想的实时计算机信息处理系统信息存储器。 相似文献