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Local Similarity based Discriminant Analysis for Face Recognition
( Xinguang Xiang ),( Fan Liu ),( Ye Bi ),( Yanfang Wang ),( Jinhui Tang ) 한국인터넷정보학회 2015 KSII Transactions on Internet and Information Syst Vol.9 No.11
Fisher linear discriminant analysis (LDA) is one of the most popular projection techniques for feature extraction and has been widely applied in face recognition. However, it cannot be used when encountering the single sample per person problem (SSPP) because the intra-class variations cannot be evaluated. In this paper, we propose a novel method called local similarity based linear discriminant analysis (LS_LDA) to solve this problem. Motivated by the “divide-conquer” strategy, we first divide the face into local blocks, and classify each local block, and then integrate all the classification results to make final decision. To make LDA feasible for SSPP problem, we further divide each block into overlapped patches and assume that these patches are from the same class. To improve the robustness of LS_LDA to outliers, we further propose local similarity based median discriminant analysis (LS_MDA), which uses class median vector to estimate the class population mean in LDA modeling. Experimental results on three popular databases show that our methods not only generalize well SSPP problem but also have strong robustness to expression, illumination, occlusion and time variation.
VPN Gateway Research in Wireless Network Based on SSL Technology
Xingkui Wang,Xinguang Peng 보안공학연구지원센터 2015 International Journal of u- and e- Service, Scienc Vol.8 No.4
Security is an important issue in the design and deployment of wireless networks. Existing equipment is mainly used in security technology include SSID, MAC address Filtering, WEP and 802.11x etc. There exists certain safety defects in design and not well protect the security of the wireless network. This paper puts forward a VPN technology was applied to the deployment scheme in wireless networks, which design a set of VPN gateway using SSL technology in Linux environment, so as to solve the current security issues in accessing resources within the network through wireless network.
Creep Properties of a Nickel-Based Single Crystal Superalloy with Low Density
Yuling Du,Zihao Tan,Yanhong Yang,Xinguang Wang,Yizhou Zhou,Jingguo Li,Xiaofeng Sun 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.12
A novel nickel-based single crystal superalloy with low density had been designed and the creep deformation mechanismsof the experiment alloy under two conditions (1050 °C/200 MPa and 1100 °C/137 MPa) had been systematically discussed. The topological inversion had been observed after fracture under the above two conditions. The effects of temperature andstress on creep life of the experiment alloy had been found no significant difference under the two conditions. It was indicatedthat the small decrease in temperature exerted limited influence on the creep behaviors of single crystal superalloys in therange of high temperature.
Yunling Du,Yanhong Yang,Shuai Guan,Xinguang Wang,Chuanyong Cui,Jinguo Li,Yizhou Zhou,Xiaofeng Sun 대한금속·재료학회 2024 METALS AND MATERIALS International Vol.30 No.1
A discontinuous plastic flow is detected in a single-crystal superalloy with an [001] orientation during tensile tests over a wide temperature range. Results reveals that the synergistic impact of normal γ′ precipitates and nanoscale γ′ precipitates in γ matrix on the dislocations motion is the root of the serrated flow.