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Quaternion Markov Splicing Detection for Color Images Based on Quaternion Discrete Cosine Transform
( Jinwei Wang ),( Renfeng Liu ),( Hao Wang ),( Bin Wu ),( Yun-qing Shi ) 한국인터넷정보학회 2020 KSII Transactions on Internet and Information Syst Vol.14 No.7
With the increasing amount of splicing images, many detection schemes of splicing images are proposed. In this paper, a splicing detection scheme for color image based on the quaternion discrete cosine transform (QDCT) is proposed. Firstly, the proposed quaternion Markov features are extracted in QDCT domain. Secondly, the proposed quaternion Markov features consist of global and local quaternion Markov, which utilize both magnitude and three phases to extract Markov features by using two different ways. In total, 2916-D features are extracted. Finally, the support vector machine (SVM) is used to detect the splicing images. In our experiments, the accuracy of the proposed scheme reaches 99.16% and 97.52% in CASIA TIDE v1.0 and CASIA TIDE v2.0, respectively, which exceeds that of the existing schemes.
Yao Runhui,Zhou Jin,Shi Jinwei,Ling Yangyi,Jiang Qiqi 대한전기학회 2024 Journal of Electrical Engineering & Technology Vol.19 No.3
The development of advanced sensorless control of high-speed permanent-magnet synchronous motor (PMSM) has been an ever-increasing demand in modern drive felds. Herein, in this article, an improved adaptive full-order sliding-mode observer (FSMO) for sensorless control of high-speed PMSM is proposed to improve the estimation accuracy of rotor speed and position. A model-referenced adaptive electrical angular velocity & back electromotive force (back EMF) observer is established. The estimated electrical angular velocity is directly fed back to the FSMO, which highly reduces the noise in the FSMO & phase-locked loop (PLL) system and weakens the chattering of the back EMF waveform, so that the estimation accuracy of the PLL on rotor speed and position is signifcantly improved. Simulations and experiments compared with the conventional method are both carried out with a 3 kW high-speed PMSM. The experimental results demonstrate that the proposed FSMO has preferable speed and position estimation capabilities under various operating conditions, which verifes the feasibility and superiority of the proposed method
Interplay Between Optical Bianisotropy and Magnetism in Plasmonic Metamolecules
Sun, Liuyang,Ma, Tzuhsuan,Yang, Seung-Cheol,Kim, Dong-Kwan,Lee, Gaehang,Shi, Jinwei,Martinez, Irving,Yi, Gi-Ra,Shvets, Gennady,Li, Xiaoqin American Chemical Society 2016 Nano letters Vol.16 No.7
<P>The smallness of natural molecules and atoms with respect to the wavelength of light imposes severe limits on the nature of their optical response. For example, the well-known argument of Landau and Lifshitz and its recent extensions that include chiral molecules show that the electric dipole response dominates over the magneto-electric (bianisotropic) and an even smaller magnetic dipole optical response for all natural materials. Here, we experimentally demonstrate that both these responses can be greatly enhanced in plasmonic nanoclusters. Using atomic force microscopy nanomanipulation technique, we assemble a plasmonic metamolecule that is designed for strong and simultaneous optical magnetic and magneto-electric excitation. Angle-dependent scattering spectroscopy is used to disentangle the two responses and to demonstrate that their constructive/destructive interplay causes strong directional scattering asymmetry. This asymmetry is used to extract both magneto-electric and magnetic dipole responses and to demonstrate their enhancement in comparison to ordinary atomistic materials.</P>
Comprehensive Evaluation of Impacts of Connecting Distributed Generation to the Distribution Network
Jin, Wei,Shi, Xuemei,Ge, Fei,Zhang, Wei,Wu, Hongbin,Zhong, Chengyuan The Korean Institute of Electrical Engineers 2017 Journal of Electrical Engineering & Technology Vol.12 No.2
In this paper, we study the various impacts of connecting distributed generation (DG) to the distribution network. The comprehensive evaluation index system (CEIS) of four hierarchies is established, considering economy, reliability and voltage quality, and the calculation methods of different indexes are presented. This paper puts forward an improved triangular fuzzy number analytic hierarchy process (ITFNAHP) to weight the second level indexes (SLI) and the third level indexes (TLI), and calculates the variation coefficient to weight the fourth level indexes (FLI). We calculate the comprehensive weight coefficients based on the weight coefficients of the SLI, TLI and FLI, and then calculate the comprehensive evaluation of satisfaction (CES) of different access schemes. On the basis of the IEEE 33-bus example system, simulations of the calculation methods and the comprehensive evaluation method are carried out under different DG access schemes according to the same total investment cost and the same permeability, respectively, and the simulation results are analyzed and discussed.