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- 저자 : Ailan Wan (검색결과 3 건)
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Evaluation of Warp Knitting and Mechanical Damage of Staple Fiber Composite Yarn
Guoqing Hao,Ailan Wan 한국섬유공학회 2023 Fibers and polymers Vol.24 No.10
In order to study the ability to knit and mechanical damage of short fiber composite yarn (SFCY) in the warp knitting process, the core-spun yarn, compact-spinning and blended yarn by ring spinning were knitted by the tricot warp-knitting machine with three different structures and speeds. The mechanical properties, the hairiness and appearance of the yarns were characterized before and after warp knitting. The results demonstrated that the breaking strength and elongation at break of the yarns decreased after warp knitting. As the speed of the machine increased, the breaking strength of the yarn continued to decrease, reaching a maximum of 28%. With the increase in under lapping, the elongation at break of the yarn reached 19% compared with the original yarn. The hairiness index of the yarns had increased significantly from the microscopic morphology. The cotton/polyamide core-spun yarn was the best for warp knitting of the four yarns. And the compact-spinning yarn is more suitable for warp knitting than ring-spun yarn.
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Dexuan Mei,Fenglin Xia,Ailan Wan,Gaoming Jiang,Pibo Ma 한국섬유공학회 2022 Fibers and polymers Vol.23 No.10
In this study, the damage of cotton yarn in high-speed warp knitting is studied by means of experimental analysisand finite element simulation. 60 s compact-spun cotton yarn was used as the experimental object, and experimental testswere carried out from the morphology characterization, mechanical properties, twist and hairiness index to analyze thedamage of cotton yarn during the let-off movement. The equivalent finite element model of cotton yarn was established tosimulate the force and damage of cotton yarn in let-off motion, and the experimental results were compared with each other. The damage model and cause of cotton yarn in high-speed warp knitting process can be obtained, which provides theexperimental basis and the theoretical basis for further study of cotton yarn warp knitting.
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( Mu Han ),( Yunwen Wang ),( Shidian Ma ),( Ailan Wan ),( Shuai Liu ) 한국인터넷정보학회 2019 KSII Transactions on Internet and Information Syst Vol.13 No.2
A code-based cryptosystem can resist quantum-computing attacks. However, an original system based on the Goppa code has a large key size, which makes it unpractical in embedded devices with limited sources. Many special error-correcting codes have recently been developed to reduce the key size, and yet these systems are easily broken through side channel attacks, particularly differential power analysis (DPA) attacks, when they are applied to hardware devices. To address this problem, a higher-order masking scheme for a McEliece cryptosystem based on the quasi-dyadic moderate density parity check (QD-MDPC) code has been proposed. The proposed scheme has a small key size and is able to resist DPA attacks. In this paper, a novel McEliece cryptosystem based on the QD-MDPC code is demonstrated. The key size of this novel cryptosystem is reduced by 78 times, which meets the requirements of embedded devices. Further, based on the novel cryptosystem, a higher-order masking scheme was developed by constructing an extension Ishai-Sahai-Wagne (ISW) masking scheme. The authenticity and integrity analysis verify that the proposed scheme has higher security than conventional approaches. Finally, a side channel attack experiment was also conducted to verify that the novel masking system is able to defend against high-order DPA attacks on hardware devices. Based on the experimental validation, it can be concluded that the proposed higher-order masking scheme can be applied as an advanced protection solution for devices with limited resources.
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