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RISS 인기검색어
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- 저자 : ( Chengsong Yang ) (검색결과 2 건)
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An Adaptive Watermark Detection Algorithm for Vector Geographic Data
( Yingying Wang ),( Chengsong Yang ),( Na Ren ),( Changqing Zhu ),( Ting Rui ),( And Dong Wang ) 한국인터넷정보학회 2020 KSII Transactions on Internet and Information Syst Vol.14 No.1
With the rapid development of computer and communication techniques, copyright protection of vector geographic data has attracted considerable research attention because of the high cost of such data. A novel adaptive watermark detection algorithm is proposed for vector geographic data that can be used to qualitatively analyze the robustness of watermarks against data addition attacks. First, a watermark was embedded into the vertex coordinates based on coordinate mapping and quantization. Second, the adaptive watermark detection model, which is capable of calculating the detection threshold, false positive error (FPE) and false negative error (FNE), was established, and the characteristics of the adaptive watermark detection algorithm were analyzed. Finally, experiments were conducted on several real-world vector maps to show the usability and robustness of the proposed algorithm.
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Out-of-plane spin polarization and antiferromagnetic spin Hall effect
Cheng Song,Xianzhe Chen,Xiaofeng Zhou,Hyunsoo Yang,Feng Pan 한국자기학회 2021 한국자기학회 학술연구발표회 논문개요집 Vol.31 No.1
The discovery of the spin Hall effect (SHE) enabled the efficient generation and manipulation of the spin current. The magnetic spin Hall effect provides a unique opportunity to control the spin current and relevant device performance with controllable magnetization. In this talk, we report the magnetic spin Hall effect both in non-collinear antiferromagnet Mn<sub>3</sub>Pt and a collinear antiferromagnet Mn<sub>2</sub>Au. We generate tiny out-of-plane polarized spin current (σZ) when the charge current is applied along the axis perpendicular to the magnetic mirror plane of Mn<sub>3</sub>Pt/permalloy bilayers, but robust when the current is parallel to the magnetic mirror plane in all of the Mn<sub>3</sub>Pt films with different orientations. In Mn<sub>2</sub>Au, the spin currents are generated at two spin sublattices with broken spatial symmetry, and the antiparallel antiferromagnetic moments play an important role. Therefore, we term the Néel vector-dependent spin Hal effect the ‘antiferromagnetic spin Hall effect’ (AFM-SHE). The out-of-plane spins from the antiferromagnetic spin Hall effect are favorable for the efficient switching of perpendicular magnetized devices, which is required for high-density applications. The antiferromagnetic spin Hall effect adds another twist to the atomic-level control of spin currents via the antiferromagnetic spin structure.
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