检索结果-南通市图书馆

New Chaotic Image Encryption Algorithm Based on Cross-Mapping

在线全文

学校读者我要写书评

暂无评论

Wuhan University Journal of Natural Sciences 2012年第6期17卷 461-467页

作者： tong xiaojun LIU Yang ZHANG Miao SHI Hongyu School of Computer Science and Technology Harbin Institute of TechnologyWeihai 264209ShandongChina

Chaotic cryptography has been applied to image encryption;however,only the traditional low-dimensional chaotic systems has been widely analyzed or deciphered,which does not show satisfied security and *** solve this problem,a new algorithm based on cross-chaos map has been created in this *** image pixels are scrambled under control of high-dimensional chaotic sequence,which is generated by cross chaotic *** image pixels are substituted by ciphertext feedback *** can relate encryption required parameters with plaintext and can make a plaintext byte affect more ciphertext *** by theoretical analysis and experimental results,the algorithm has higher complex degree and has passed SP800-22 pseudo-random number standard tests,and it has high encryption speed,high security,*** can be widely applied in the field of image encryption.

关键词： chaos image encryption cross chaotic map cross-scrambling substitute

The Grade Difference Format and MGM^p （1,n） Optimization Model

在线全文

学校读者我要写书评

暂无评论

通讯和计算机（中英文版） 2005年第7期2卷 37-41页

作者： Shemin Zhang xiaojun tong Department of Control Science and Engineering Huazhong University of Science and Technology Wuhan 430074 China School of Information Xi＇an University of Finance and Economics Xi＇an 710061 China Department of Mathematics and Physics Wuhan Polytechnic University Wuhan 430074 China

Research of Data Encryption and Digital Signature on Electronic Paymetnt

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

通讯和计算机（中英文版） 2005年第9期2卷 58-61页

作者： xiaojun tong Zhu Wang Computer Department Harbin Institute of Technology （Weihai） Weihai 264209 China

Exploration and Practice of Online Teaching Mode for“Three Preparations Before Class,Five Channels in Class and Five Tracking after Class”

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

计算机教育 2021年第12期 147-156页

作者： Miao Zhang Hua Zhang Dianhui Chu xiaojun tong Kaikun Dong School of Computer Science and Technology Harbin Institute of TechnologyWeihai264209China

Aiming at the characteristics of huge knowledge points,strong practicality and diversity of software security course,adhering to the“Π”scheme for emerging engineering education,based on Tencent classroom,Tencent conference and Lan ink cloud class,and guided by BOPPPS teaching model and deep learning theory,“three preparations before class,five channels in class and five tracking after class”is *** preparations before class and five tracking after class serve the five channels in *** channels in class take live teaching as the core,and teach students knowledge through five *** has proved that this mode can effectively solve the problem of teaching a large number of knowledge in limited class hours,improve students’practical ability and enhance the effect of classroom teaching.

关键词： online teaching BOPPPS teaching model deep learning flipped classroom software security

在线全文

学校读者我要写书评

暂无评论

路径排序问题基于表面的DNA算法

华中科技大学学报（自然科学版） 2005年第8期33卷 100-103页

作者：周康同小军许进武汉工业学院数理科学系湖北武汉430023 华中科技大学控制科学与工程系湖北武汉430074

提出了路径排序问题表面DNA算法三步骤:a.找出两端点的所有链,b.筛选出所有的路,c.得到路序.指出编码问题在DNA计算中的重要性.在算法实现过程中,用保护两端点对应的DNA片段3′端或5′端的办法得到所有的链,并用电泳的方法对链进行排序... 详细信息

提出了路径排序问题表面DNA算法三步骤:a.找出两端点的所有链,b.筛选出所有的路,c.得到路序.指出编码问题在DNA计算中的重要性.在算法实现过程中,用保护两端点对应的DNA片段3′端或5′端的办法得到所有的链,并用电泳的方法对链进行排序以及去掉链长大于图权值总和的链;对探针进行生物素标记并且采用观察、记录亮点强度的办法筛选出所有的路;分析实验记录得到路序.将算法推广到最短(长)路问题的不同之处在第三步,即只需分析在表面上排在最前(最后)的DNA链的实验记录就得到最短(长)路.

关键词：路序 DNA计算生化实验电泳

在线全文

学校读者我要写书评

暂无评论

基于DNA计算的指派问题

华中科技大学学报（自然科学版） 2008年第2期36卷 35-38页

作者：周康同小军许进武汉工业学院数理科学系湖北武汉430023 华中科技大学控制科学与工程系湖北武汉430074

给出了推广的闭环DNA计算模型及其生化实验.用闭环DNA计算模型设计出了指派问题的DNA算法.对决策变量进行4组DNA编码来存放决策变量和效益值;通过有目的的终止技术和删除实验得到指派问题的全部可行解;通过批接入实验、电泳实验和检测... 详细信息

给出了推广的闭环DNA计算模型及其生化实验.用闭环DNA计算模型设计出了指派问题的DNA算法.对决策变量进行4组DNA编码来存放决策变量和效益值;通过有目的的终止技术和删除实验得到指派问题的全部可行解;通过批接入实验、电泳实验和检测实验获得最优指派问题的最优解.举例说明了算法的可行性.最后讨论了推广的闭环DNA计算模型的应用前景和不足之处.

关键词：指派问题闭环DNA计算模型批接入实验有目的的终止技术

Boosting hydrocarbon conversion via Cu-doping induced oxygen vacancies on CeO2 in CO2 electroreduction

在线全文

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2025年第1期100卷 66-76页

作者： Lei Xue tong Shi Chenhui Han Heng Zhang Fenrong Liu Haorun Li Yan Wang xiaojun Gu Shanghong Zeng Inner Mongolia Key Laboratory of Chemistry and Physics of Rare Earth Materials School of Chemistry and Chemical Engineering Inner Mongolia University State Key Laboratory of Coal Conversion Institute of Coal Chemistry Chinese Academy of Sciences Institute of Catalysis Department of Chemistry Zhejiang University National Key Laboratory of Baiyunobo Rare Earth Resource Research and Comprehensive Utilization Baotou Research Institute of Rare Earths

Conversion of CO2back to hydrocarbons is the most direct way of closing the“carbon cycle”,and its significance is further enlarged if this process is driven by renewable energies such as ***,precisely controlling the product selectivity towards hydrocarbons against the competitive hydrogen evolution remains challenging,especially for Cu-based ***,we report a novel defect engineering strategy,by which Cu-doping-induced oxygen vacancies on CeO2nanorods were effectively created,with adjustable vacancy/Cu *** resulting optimum catalyst shows up to 79% catalytic current density to hydrocarbons （excluding CO）,with 49% faradaic efficiency to *** and density functional theory unveil that the ratio between oxygen vacancy and Cu affects significantly the formation of*CHO and activation of H2O,which leads to the following deep hydrogenation to *** findings may spur new insights for designing and developing more controllable chemical process relevant to CO2utilization.

关键词： Oxygen vacancy Hydrocarbon production Reaction mechanism

Feedback image encryption algorithm with compound chaotic stream cipher based on perturbation

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Science China(Information Sciences) 2010年第1期53卷 191-202页

作者： tong xiaojun1 & CUI MingGen2 1School of Computer Science and Technology, Harbin Institute of Technology, Weihai 264209, China 2School of Science, Harbin Institute of Technology, Weihai 264209, China School of Computer Science and Technology Harbin Institute of Technology Weihai China School of Science Harbin Institute of Technology Weihai China

In this paper, two new one-dimensional chaotic functions are designed using Devaney chaotic definition. And a dynamically shifting compound chaotic function is constructed based on the two new one-dimensional chaotic functions. The properties of compound chaotic functions are also proved. A new feedback image encryption algorithm is designed using the new compound chaos and an image pixel permutation, 3D baker scheme is described in detail. In the scheme, a new dynamic block dividing the 3D baker is put forward using the compound chaotic map, and the key space expands. In order to produce avalanche effect and sensitivity of cipher to plaintext, the round times are designed to control the cycle. The entropy analysis, difference analysis, weak-key analysis, statistical analysis, cipher random analysis, and cipher sensibility analysis depending on key and plaintext are introduced to test the security of the new scheme of image encryption. The tests show that the image encryption method passes the random tests of NIST FIPS 140-2(2001) and SP 800-22 standards. This paper also solves the problem of short periods and low precision of one-dimensional chaotic function by perturbation.

关键词： compound chaos stream cipher feedback image encryption 3D baker perturbation

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

横向耦合谐振滤波器寄生模式抑制的研究

压电与声光 2011年第2期33卷 165-167,173页

作者：童筱钧钟素娟无锡秦歌电子科技有限公司江苏无锡214000 南京大学声学研究所近代声学教育部重点实验室江苏南京210093

该文应用耦合模理论,重点研究了几个关键因素对横向耦合谐振滤波器高次模式对应旁瓣相对于主通带相对衰减量的影响。这几个关键因素包括相对膜厚、反射栅与换能器周期比、换能器间汇流条宽度等。研究表明,该文在设计频率为159.2 MHz的... 详细信息

该文应用耦合模理论,重点研究了几个关键因素对横向耦合谐振滤波器高次模式对应旁瓣相对于主通带相对衰减量的影响。这几个关键因素包括相对膜厚、反射栅与换能器周期比、换能器间汇流条宽度等。研究表明,该文在设计频率为159.2 MHz的横向耦合谐振滤波器时,对高次模式引起的旁瓣作了抑制处理,该文给出了此滤波器的计算模拟结果和实验测试数据。实验器件匹配后具有高阻带抑制(通带外抑制达50 dB)、低插损(2.9 dB)和平坦的通带(通带波纹小于0.3 dB),1 dB带宽为130 kHz。

关键词：横向耦合谐振滤波器声表面波(SAW)滤波器耦合模