Toroidal composite vessel winded with fiber is a new kind of structural pressure vessels,which not only has high structure efficiency of compound materials pressure vessel,good security and so on,but also has special ...Toroidal composite vessel winded with fiber is a new kind of structural pressure vessels,which not only has high structure efficiency of compound materials pressure vessel,good security and so on,but also has special shape and the property of u- tilizing toroidal space,and the prospect of the application of toroidal composite vessel winded with fiber is extremely broad.By in- troducing parameters establishment of toroidal vessel and elaborating the principle of filament winding for toroidal vessel,the de- sign model of filament winding machine for toroidal vessel has been introduced,and the design model has been dynamically simu- lated by the software of ADAMS,which will give more referrence for the design of real toroidal vessel twister.展开更多
With the rapid development of digital information technology,images are increasingly used in various fields.To ensure the security of image data,prevent unauthorized tampering and leakage,maintain personal privacy,and...With the rapid development of digital information technology,images are increasingly used in various fields.To ensure the security of image data,prevent unauthorized tampering and leakage,maintain personal privacy,and protect intellectual property rights,this study proposes an innovative color image encryption algorithm.Initially,the Mersenne Twister algorithm is utilized to generate high-quality pseudo-random numbers,establishing a robust basis for subsequent operations.Subsequently,two distinct chaotic systems,the autonomous non-Hamiltonian chaotic system and the tentlogistic-cosine chaotic mapping,are employed to produce chaotic random sequences.These chaotic sequences are used to control the encoding and decoding process of the DNA,effectively scrambling the image pixels.Furthermore,the complexity of the encryption process is enhanced through improved Joseph block scrambling.Thorough experimental verification,research,and analysis,the average value of the information entropy test data reaches as high as 7.999.Additionally,the average value of the number of pixels change rate(NPCR)test data is 99.6101%,which closely approaches the ideal value of 99.6094%.This algorithm not only guarantees image quality but also substantially raises the difficulty of decryption.展开更多
文摘Toroidal composite vessel winded with fiber is a new kind of structural pressure vessels,which not only has high structure efficiency of compound materials pressure vessel,good security and so on,but also has special shape and the property of u- tilizing toroidal space,and the prospect of the application of toroidal composite vessel winded with fiber is extremely broad.By in- troducing parameters establishment of toroidal vessel and elaborating the principle of filament winding for toroidal vessel,the de- sign model of filament winding machine for toroidal vessel has been introduced,and the design model has been dynamically simu- lated by the software of ADAMS,which will give more referrence for the design of real toroidal vessel twister.
基金supported by the Open Fund of Advanced Cryptography and System Security Key Laboratory of Sichuan Province(Grant No.SKLACSS-202208)the Natural Science Foundation of Chongqing(Grant No.CSTB2023NSCQLZX0139)the National Natural Science Foundation of China(Grant No.61772295).
文摘With the rapid development of digital information technology,images are increasingly used in various fields.To ensure the security of image data,prevent unauthorized tampering and leakage,maintain personal privacy,and protect intellectual property rights,this study proposes an innovative color image encryption algorithm.Initially,the Mersenne Twister algorithm is utilized to generate high-quality pseudo-random numbers,establishing a robust basis for subsequent operations.Subsequently,two distinct chaotic systems,the autonomous non-Hamiltonian chaotic system and the tentlogistic-cosine chaotic mapping,are employed to produce chaotic random sequences.These chaotic sequences are used to control the encoding and decoding process of the DNA,effectively scrambling the image pixels.Furthermore,the complexity of the encryption process is enhanced through improved Joseph block scrambling.Thorough experimental verification,research,and analysis,the average value of the information entropy test data reaches as high as 7.999.Additionally,the average value of the number of pixels change rate(NPCR)test data is 99.6101%,which closely approaches the ideal value of 99.6094%.This algorithm not only guarantees image quality but also substantially raises the difficulty of decryption.
