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A Novel Preserving Client Privacy and Designate Verifier Auditing Scheme for Cloud Storage
Jiang Xu,Wenliang Chen,Sai Ji,Yongjun Ren,Jin Wang 보안공학연구지원센터 2015 International Journal of Security and Its Applicat Vol.9 No.1
Cloud storage is now an important development trend in information technology. To ensure the integrity of data storage in cloud storing, researchers have present some proof of storage schemes. In some cases, the ability to check data possession is delegated by data owners. Hence, the delegable provable data possession and proxy provable data possession are proposed. However the schemes are not secure since the proxy or designated verifier stores some delegation information in cloud storage servers. In this paper, we propose PC-DV POS scheme, which can preserve clients’ privacy and designate a verifier by the client signed the data blocks. In particular, we utilize group signatures and key exchange to construct homomorphic authenticators, so that only the designated verifier is able to check the integrity of shared data for users without retrieving the entire data, and cannot reveal the identities of signers on all blocks in shared data.
Studies on Residue Stress and Deformation Behavior of GCr15 Subjected to Whirlwind Milling
Qin Guo,Youfeng Xu,Mulan Wang,Wenliang Yang,Yuliln Wang 한국정밀공학회 2020 International Journal of Precision Engineering and Vol.21 No.8
Whirlwind milling is gaining extensive application for processing a large screw. Due to its specific forming principle, the profile of residual stresses and the deformation behavior would been given significant emphasis. Under conditions of large cutting depth (0.06–0.12 mm), the effect of cutting parameters on three characteristic parameters of the residual stress, such as surface residual stress, maximum residual stress and residual stress extreme value, was always different from that under small cutting depth (6–10 μm). Comparing to the right arc of the screw, the plastic deformation in the left arc is more obvious and far-reaching. The most extensive deformation region caused by WM cutting force was found for the topmost surface. As cutting speed increased, the nanohardness variation reflected the decreasing plastic deformation. Therefore, the research on physical change by WM is instructive for extending the fatigue life of the screw.
Wen Liang,Qing Yuan,Sheng Liu,Guang Xu 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.6
In order to reveal the formation mechanism of microstructural delamination in flange steel during punching, the microstructuralcharacteristics of flange steels with 0.064, 0.085, and 0.101 wt% carbon contents were analyzed by an opticalmicroscope, optical emission spectrometer, metal in situ analyzer, and electron probe microanalyzer. It was found that microstructuraldelamination occurred due to C and Mn segregation, especially the former. The intensive segregation degree ofC was dependent on its relatively smaller partition coefficient. Moreover, the segregation degree gradually decreased withthe decreasing carbon content. And the increased segregations of elements except carbon were related to the coupling effectbetween different alloying elements. Furthermore, C and Mn were prone to segregate at the 1/4th position along the transversedirection of the casting slab; hence, almost no segregation was noticed at the edge of the casting slab. The homogenizationtreatment had a substantial effect on the elimination of C segregation; however, Mn segregation was relatively hard to beremoved.