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Research on Embedded Image Edge Detection Algorithm
Gang Li,Ruixiang Huang 보안공학연구지원센터 2016 International Journal of Signal Processing, Image Vol.9 No.12
With the development of embedded technology, the embedded image processing algorithms are becoming more and more complex. Edge detection is the basic algorithm of image processing, which is used in the extraction of information from the image. Laplacian operator is useful for the edge detection. Especially, the operator can be determined by the zero crossing point of the two differential positive and negative peaks. In order to meet the fast hardware implementation of embedded image processing, this paper presents the hardware acceleration of Laplacian operator by Zynq-7000. Using HLS method, the complex image algorithm is automatically translated into hardware language, and the function of the algorithm can be quickly completed. The experimental results show that, the embedded hardware accelerated image based on Zynq-7000 can not only realize software programming and hardware programmable combination, but also improve the embedded system flexibility, scalability, and accelerate embedded image processing product design time.
Multi-scale Nano/Micro Fiber Scaffolds with Different Topological Morphologies
Jianyong Feng,Ruixiang Xu,Jiaming Zhao,Lingxiao Zhang 한국섬유공학회 2022 Fibers and polymers Vol.23 No.4
The multi-scale fiber and topological morphologies had been shown to influence cell mitogenesis and chemotaxis,direct cell differentiation, and induce constructive host tissue remodeling responses. To simulate multi-layer meshworkarchitecture of extracellular matrix and regulate cell behavior, we prepared different topological scaffolds, such as 3Dprinting fiber scaffolds, poly(lactic acid) (PLA) electrospun fiber scaffolds, 3D printing/knitted fabric composite scaffolds,and PLA electrospinning/knitted fabric composite scaffolds. The surface morphology, pore diameter, thickness, stress-straincurve, electrical current, and other properties were studied. The aim is to prepare multi-scale nano/micro fiber scaffolds withdifferent topological morphologies and properties that can provide structural and mechanical support for potential tissueengineering applications.
Yiwei Wu,Qufei Song,Ruixiang Wang,Yao Xiao,Hanyang Gu,Hui Guo Korean Nuclear Society 2023 Nuclear Engineering and Technology Vol.55 No.6
With the rise of economic and safety standards for nuclear reactors, new concepts of Gen-IV reactors and modular reactors showed more complex designs that challenge current tools for reactor physics analysis. A Monte Carlo (MC) two-step method was proposed in this work. This calculation scheme uses the continuous-energy MC method to generate multi-group cross-sections from heterogeneous models. The multi-group MC method, which can adapt locally-heterogeneous models, is used in the core calculation step. This calculation scheme is verified using a Gen-IV modular lead-based fast reactor (LFR) benchmark case. The influence of homogenized patterns, scatter approximations, flux separable approximation, and local heterogeneity in core calculation on simulation results are investigated. Results showed that the cross-sections generated using the 3D assembly model with a locally heterogeneous representation of control rods lead to an accurate estimation with less than 270 pcm bias in core reactivity, 0.5% bias in control rod worth, and 1.5% bias on power distribution. The study verified the applicability of multi-group cross-sections generated with the MC method for LFR analysis. The study also proved the feasibility of multi-group MC in core calculation with local heterogeneity, which saves 85% time compared to the continuous-energy MC.
Design Method for the LCL Filters of Three-phase Voltage Source PWM Rectifiers
Guo, Xizheng,You, Xiaojie,Li, Xinran,Hao, Ruixiang,Wang, Dewei The Korean Institute of Power Electronics 2012 JOURNAL OF POWER ELECTRONICS Vol.12 No.4
A new design method for the LCL filters of three-phase voltage source PWM rectifiers is presented in this paper. Based on the single-phase harmonic equivalent model, the harmonic voltage of the rectifier side is calculated to design the LCL filter parameters by an iterative algorithm, in which the resonance frequency $f_{res}$ and the ratio r between the grid-side inductance and the rectifier-side inductance are selected as known constants. The design criteria and process are introduced and the influence on the design result by the value of the resonance frequency $f_{res}$, ratio r is analyzed. Finally an example (600V, 500kW) is tested by simulation and experiment to verify the validity of the new design method.
Qiao Peitong,Mei Xianghan,Li Ruixiang,Zhao Qiaoling,Xia Dingguo,Qiu Zhiyong,Shen Dongxu 한국응용곤충학회 2022 Journal of Asia-Pacific Entomology Vol.25 No.4
Peptidoglycan recognition proteins (PGRPs) discriminate and bind peptidoglycans by acting as pattern recog nition receptors (PRRs) in insects, and function pivotal roles in innate immune response. In the present study, we cloned a full-length PGRP gene designed as OfPGRP8 from the Asian corn borer, Ostrinia furnacalis (Guenée). Its mRNA exhibited the highest abundance in fat body, and its expression level upregulated dramatically after bacterial challenges. Purified recombinant OfPGRP8 exhibited intensive binding capacity to peptidoglycans from Staphylococcus aureus and Micrococcus luteus. Additionally, recombinant OfPGRP8 could inhibit the growth of S. aureus, M. luteus. However, recombinant OfPGRP8 could not cause agglutination of S. aureus, M. luteus or Escherichia coli. Furthermore, we also demonstrated that OfPGRP8 may be involved in modulating the signaling pathway of antimicrobial peptides (AMPs) synthesis. In sum, our results provided evidence that OfPGRP8 dis criminates peptidoglycans from microbes and acts as a PRR to initiate downstream immune signaling pathways.
HALF-METALLIC SILICENE AND GERMANENE NANORIBBONS: TOWARDS HIGH-PERFORMANCE SPINTRONICS DEVICE
YANGYANG WANG,JIAXIN ZHENG,ZEYUAN NI,RUIXIANG FEI,QIHANG LIU,RUGE QUHE,CHENGYONG XU 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2012 NANO Vol.7 No.5
By using first-principles calculations, we predict that an in-plane homogenous electrical ¯eld can induce half-metallicity in hydrogen-terminated zigzag silicene and germanene nanoribbons (ZSiNRs and ZGeNRs). A dual-gated ¯nite ZSiNR device reveals a nearly perfect spin-¯lter e±ciency (SFE)of up to 99% while a quadruple-gated ¯nite ZSiNR device serves as an effective spin ¯eld e®ect transistor (FET) with an on/o® current ratio of over 100 from ab initio quantum transport simulation. This discovery opens up novel prospect of silicene and germanene in spintronics.
Design Method for the LCL Filters of Three-phase Voltage Source PWM Rectifiers
Xizheng Guo,Xiaojie You,Xinran Li,Ruixiang Hao,Dewei Wang 전력전자학회 2012 JOURNAL OF POWER ELECTRONICS Vol.12 No.4
A new design method for the LCL filters of three-phase voltage source PWM rectifiers is presented in this paper. Based on the single-phase harmonic equivalent model, the harmonic voltage of the rectifier side is calculated to design the LCL filter parameters by an iterative algorithm, in which the resonance frequency fres and the ratio r between the grid-side inductance and the rectifier-side inductance are selected as known constants. The design criteria and process are introduced and the influence on the design result by the value of the resonance frequency fres, ratio r is analyzed. Finally an example (600V, 500kW) is tested by simulation and experiment to verify the validity of the new design method.
Zhiqiao Li,Xiang Zhang,Guojun Ma,Dingli Zheng,Ruixiang He,Tianyu Du 한양대학교 청정에너지연구소 2023 Journal of Ceramic Processing Research Vol.24 No.1
Stainless steel dust (SSD) can be utilized as the primary raw material for the production of Fe-Cr-Ni-Mn system black ceramicpigments because it is high in transition metal elements. However, in addition to the ingredients required for the preparationof black pigments, it also contains some impurity elements like Ca, Mg, Si and Zn, and the influence of these impurity elementson the coloring performance of the pigments is unclear. In this paper, pure chemical reagents were used as raw materials tosimulate the main components of SSD for the solid-phase synthesis of black ceramic pigments doped with various impuritycomponents (CaO, MgO, SiO2 and ZnO). The results show that the doping of MgO can improve the purity of the preparedblack ceramic pigments, whereas CaO, SiO2 and ZnO can turn the pigments become reddish yellow. In the doped samples,ZnO and MgO mainly react with Fe2O3 to form ZnFe2O4 and MgFe2O4. In addition, CaO reacts with Fe2O3 to generateCaFe4O7. The reactions described above can increase the average crystallite size and distort the crystal lattice of the crystalsin the pigment samples. Moreover, SiO2 exists in amorphous form among spinel grains.
Mg-doped ZnO layer to enhance electron transporting for PbS quantum dot solar cells
Xing Meibo,Wei Yuyao,Wang Dandan,Shen Qing,Wang Ruixiang 한국물리학회 2021 Current Applied Physics Vol.21 No.-
In this work, the effect of Mg doping on the performance of PbS quantum dot (QD) solar cells (QDSCs) is investigated. To elucidate that, PbS QDSCs with pristine ZnO and Mg-doped ZnO (ZMO) as electron transporting layers (ETLs) are fabricated, respectively. The current density-voltage (J-V) measurements are performed. The results show that the cell efficiency of the device with ZMO as an ETL is 9.46%, which increases about 75% compared to that of the pristine ZnO based device (5.41%). Enhanced short current density (Jsc) and fill factor (FF) are observed. It is demonstrated that Mg doping could passivate the surface defects and suppress the carrier recombination in ZnO ETL, thus resulting in larger bandgap and higher Fermi level (EF). The strategy of Mgdoped ZnO ETL provides a promising way for pushing solar cell performance to a high level.