资源类型

期刊论文 2

年份

2021 1

2007 1

关键词

医学图像加密;DNA;混沌吸引子;交叉;突变;电子医疗 1

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Thermal deflection analysis of the solidified shell in continuous casting of slab

LIU Hongzhao, WANG Zhongmin

《机械工程前沿(英文)》 2007年 第2卷 第2期   页码 175-179 doi: 10.1007/s11465-007-0029-3

摘要: The thermal deformation problem in the continuous casting of a slab subjected to thermal loading because of the temperature gradient along the solidified shell thickness is investigated. On the basis of the reciprocal theorem of work or Betti-Maxwell s reciprocal theorem and the superposition principle, the deflection expressions for a rectangular plate with the two opposite edges simply supported, and the other two opposite edges clamped under the action of the uniformly distributed load and nonuniform temperature field are derived respectively. The meaning of each term in the deflection expression obtained by the reciprocal theorem of work is explained. Then the practical example is given to calculate the thermal deformation and the bulging deformation of the solidified shell under three tension speeds. This research is useful for analyzing the bulging deformation in the continuous casting of a slab under the static pressure of the molten steel and the thermal loading because of the temperature gradient along the solidified shell thickness.

关键词: s reciprocal     loading     deflection expression     reciprocal     opposite    

互易域上的仿生密码系统:DNA链变异以保护健康数据 Research Articles

S. AASHIQ BANU, Rengarajan AMIRTHARAJAN

《信息与电子工程前沿(英文)》 2021年 第22卷 第7期   页码 940-956 doi: 10.1631/FITEE.2000071

摘要: 医疗保健和远程医疗行业依赖于互联网技术,数字健康数据更易受到网络攻击,因其中包含大量个人数据,因而,有必要保护数字医疗图像以及保证其安全传输。本文采用基于洛伦兹和吕混沌吸引子突变的DNA加密技术生成强伪随机密钥流。为增强混淆与扩散阶段的近似性系数,所提的混沌DNA加密系统在整数小波变换域和一个生物启发的交叉变异单元上运行。进而,使用组合演化吸引子中的量化混沌集进行异或运算。该算法可以获得平均信息熵7.9973,几乎接近于零相关性的像素变化率(number of pixel change rate, NPCR)99.642%,归一平均强度变化(unified average change in intensity, UACI)33.438%,以及密钥空间10203。此外,实验分析和基于美国国家标准与技术研究院(NIST)的统计测试套件测试证实,所提医疗图像加密技术具有抵御任何统计、差分和暴力攻击的能力。

关键词: 医学图像加密;DNA;混沌吸引子;交叉;突变;电子医疗    

标题 作者 时间 类型 操作

Thermal deflection analysis of the solidified shell in continuous casting of slab

LIU Hongzhao, WANG Zhongmin

期刊论文

互易域上的仿生密码系统:DNA链变异以保护健康数据

S. AASHIQ BANU, Rengarajan AMIRTHARAJAN

期刊论文