Finger Vein Recognition Based on Multi-Orientation Weighted Symmetric Local Graph Structure

( Song Dong ),( Jucheng Yang ),( Yarui Chen ),( Chao Wang ),( Xiaoyuan Zhang ),( Dong Sun Park ) 한국인터넷정보학회 2015 KSII Transactions on Internet and Information Syst Vol.9 No.10

Finger vein recognition is a biometric technology using finger veins to authenticate a person, and due to its high degree of uniqueness, liveness, and safety, it is widely used. The traditional Symmetric Local Graph Structure (SLGS) method only considers the relationship between the image pixels as a dominating set, and uses the relevant theories to tap image features. In order to better extract finger vein features, taking into account location information and direction information between the pixels of the image, this paper presents a novel finger vein feature extraction method, Multi-Orientation Weighted Symmetric Local Graph Structure (MOW-SLGS), which assigns weight to each edge according to the positional relationship between the edge and the target pixel. In addition, we use the Extreme Learning Machine (ELM) classifier to train and classify the vein feature extracted by the MOW-SLGS method. Experiments show that the proposed method has better performance than traditional methods.

An improved solid boundary treatment for waveefloat interactions using ISPH method

Xing Zheng,Xipeng Lv,Qingwei Ma,Wenyang Duan,Abbas Khayyer,Songdong Shao 대한조선학회 2018 International Journal of Naval Architecture and Oc Vol.10 No.3

The Smoothed Particle Hydrodynamics (SPH) method has proved to have great potentials in dealing with the wave-structure interactions. Compared with the Weakly Compressible SPH (WCSPH) method, the ISPH approach solves the pressure by using the pressure Poisson equation rather than the equation of state. This could provide a more stable and accurate pressure field that is important in the study of wave-structure interactions. This paper improves the solid boundary treatment of ISPH by using a high accuracy Simplified Finite Difference Interpolation (SFDI) scheme for the 2D wave-structure coupling problems, especially for free-moving structure. The proposed method is referred as the ISPH_BS. The model improvement is demonstrated by the documented benchmark tests and laboratory experiment covering various wavestructure interaction applications.

PANI-Encapsulated Si Nanocomposites with a Chemical Bond Linkage in the Interface Exhibiting Higher Electrochemical Stability as Anode Materials for Lithium-Ion Batteries

Renzhong Huang,Yuqiu Xie,Qing Chang,Jian Xiong,Shiqi Guan,Songdong Yuan,Guodong Jiang 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2019 NANO Vol.14 No.6

A covalent linkage between polyaniline (PANI) and Si nanoparticles in PANI-encapsulated Si nanocomposites was proposed and achieved by a facile and economical synthetic strategy, in which NH2-grafted Si was first obtained via a chemical modification of Si surface and the polymerization of aniline initiated at NH2 group surface was readily accomplished to get PANI shell. The characterizations suggested that NH2 groups were successfully introduced onto Si surface and PANI-encapsulated Si nanocomposites with a core/shell structure were fabricated. Electrochemical tests showed that our proposed Si nanocomposites delivered a high initial specific capacity of 2135 mAh/g and retained 848 mAh/g after 100 charge/discharge cycles at a current density of 0.1 A/g, which were superior than that of the normal PANI-encapsulated Si nanocomposites with the absence of chemical bonds in the interface. The enhanced electrochemical performance was ascribed to the surface chemical modification and the introduction of chemical bond in the interface. NH2 group function of Si could improve the homogeneity of encapsulated PANI shell. Additionally, PANI was tightly anchored to Si nanoparticles via a covalent bond between silicon and PANI, which would greatly inhibit the separation of PANI from Si surface during the expansion/contraction of Si particles. Thus, the structural integrity was maintained. Besides, PANI layer with a unique structure promoted the transport of both electrons and lithium ions.

An improved solid boundary treatment for wave-float interactions using ISPH method

Zheng, Xing,Lv, Xipeng,Ma, Qingwei,Duan, Wenyang,Khayyer, Abbas,Shao, Songdong The Society of Naval Architects of Korea 2018 International Journal of Naval Architecture and Oc Vol.10 No.3

The Smoothed Particle Hydrodynamics (SPH) method has proved to have great potentials in dealing with the wave-structure interactions. Compared with the Weakly Compressible SPH (WCSPH) method, the ISPH approach solves the pressure by using the pressure Poisson equation rather than the equation of state. This could provide a more stable and accurate pressure field that is important in the study of wave-structure interactions. This paper improves the solid boundary treatment of ISPH by using a high accuracy Simplified Finite Difference Interpolation (SFDI) scheme for the 2D wave-structure coupling problems, especially for free-moving structure. The proposed method is referred as the ISPH_BS. The model improvement is demonstrated by the documented benchmark tests and laboratory experiment covering various wave-structure interaction applications.

Effects of HY addition on NiMoS active phase of NiMo(NH3) impregnated NiMo/Al2O3-HY and its role in 4,6-dimethyl-dibenzothiophene hydrodesulfurization

Yanzeng Dong,Xiaohang Yu,Zhiheng Wang,Xin Liu,Yanyan Liu,Ruiyao Gao,Songdong Yao 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.117 No.-

Effects of HY addition on NiMoS active phase of NiMo(NH3) impregnated NiMo/Al2O3-HY and its role in4,6-dimethyl-dibenzothiophene hydrodesulfurization was investigated. The results show that HY canpromote HDS reaction by changing the morphology of NiMoS nanoclusters even when isomerization of4,6-DMDBT is not involved. In the absence of strong acid sites, TOF of NiMo/Al2O3 catalyst was stillimproved by 90%. XRD, H2-TPR, Raman, TEM, and XPS characterization show that proper metal supportinteraction caused by HY addition is beneficial to the formation of large-scale multilayer NiNoS clusters,the enrichment of Ni in NiMoS clusters and the increase of NiMoS active sites, thereby leading HDS catalystexhibiting highest intrinsic activity (TOF). However, too strong or too weak metal support interactionwill reduce intrinsic activity for HDS catalysts. When pH value of impregnation solution is 10, thestrong metal support interaction reduces layer numbers of NiMoS clusters. When pH value of impregnationsolution is 11, negative charge hinders the formation of NiMoS clusters. This not only leads to a furtherdecrease HYD pathway selectivity, but also significantly reduces the initial reaction rate of HDScatalyst.

Molecular cloning and expression analysis of the first two key genes through 2-C-methyl-D-erythritol 4-phosphate (MEP) pathway from Pyropia haitanensis(Bangiales, Rhodophyta)

Yu Du,Jian Guan,Ruijun Xu,Xin Liu,Weijie Shen,Yafeng Ma,Yuan He,Songdong Shen 한국조류학회I 2017 ALGAE Vol.32 No.4

Pyropia haitanensis (T. J. Chang et B. F. Zheng) N. Kikuchi et M. Miyata is one of the most commercially usefulmacroalgae cultivated in southeastern China. In red algae, the biosynthesis of terpenoids through 2-C-methyl-Derythritol4-phosphate (MEP) pathway can produce a direct influence on the synthesis of many biologically importantmetabolites. In this study, two genes of cDNAs, 1-deoxy-D-xylulose-5-phosphate synthase (DXS) and 1-deoxy-Dxylulose-5-phosphatereductase (DXR), which encoding the first two rate-limiting enzymes among MEP pathway werecloned from P. haitanensis. The cDNAs of P. haitanensis DXS (PhDXS) and DXR (PhDXR) both contained complete openreading frames encoding polypeptides of 764 and 426 amino acids residues, separately. The expression analysis showedthat PhDXS was significant differently expressed between leafy thallus and conchocelis as PhDXR been non-significant. Additionally, expression of PhDXR and its downstream gene geranylgeranyl diphosphate synthase were both inhibitedby fosmidomycin significantly. Meanwhile, we constructed types of phylogenetic trees through different algae and higherplants DXS and DXR encoding amino acid sequences, as a result we found tree clustering consequences basically in linewith the "Cavalier-Smith endosymbiotic theory." Whereupon, we speculated that in red algae, there existed only completeMEP pathway to meet needs of terpenoids synthesis for themselves; Terpenoids synthesis of red algae derivativesthrough mevalonate pathway came from two or more times endosymbiosis of heterotrophic eukaryotic parasitifer. Thisstudy demonstrated that PhDXS and PhDXR could play significant roles in terpenoids biosynthesis at molecular levels. Meanwhile, as nuclear genes among MEP pathway, PhDXS and PhDXR could provide a new way of thinking to researchthe problem of chromalveolata biological evolution.

Molecular cloning and expression analysis of the first two key genes through 2-C-methyl-D-erythritol 4-phosphate (MEP) pathway from Pyropia haitanensis (Bangiales, Rhodophyta)

Du, Yu,Guan, Jian,Xu, Ruijun,Liu, Xin,Shen, Weijie,Ma, Yafeng,He, Yuan,Shen, Songdong The Korean Society of Phycology 2017 ALGAE Vol.32 No.4

Pyropia haitanensis (T. J. Chang et B. F. Zheng) N. Kikuchi et M. Miyata is one of the most commercially useful macroalgae cultivated in southeastern China. In red algae, the biosynthesis of terpenoids through 2-C-methyl-D-erythritol 4-phosphate (MEP) pathway can produce a direct influence on the synthesis of many biologically important metabolites. In this study, two genes of cDNAs, 1-deoxy-D-xylulose-5-phosphate synthase (DXS) and 1-deoxy-D-xylulose-5-phosphate reductase (DXR), which encoding the first two rate-limiting enzymes among MEP pathway were cloned from P. haitanensis. The cDNAs of P. haitanensis DXS (PhDXS) and DXR (PhDXR) both contained complete open reading frames encoding polypeptides of 764 and 426 amino acids residues, separately. The expression analysis showed that PhDXS was significant differently expressed between leafy thallus and conchocelis as PhDXR been non-significant. Additionally, expression of PhDXR and its downstream gene geranylgeranyl diphosphate synthase were both inhibited by fosmidomycin significantly. Meanwhile, we constructed types of phylogenetic trees through different algae and higher plants DXS and DXR encoding amino acid sequences, as a result we found tree clustering consequences basically in line with the "Cavalier-Smith endosymbiotic theory." Whereupon, we speculated that in red algae, there existed only complete MEP pathway to meet needs of terpenoids synthesis for themselves; Terpenoids synthesis of red algae derivatives through mevalonate pathway came from two or more times endosymbiosis of heterotrophic eukaryotic parasitifer. This study demonstrated that PhDXS and PhDXR could play significant roles in terpenoids biosynthesis at molecular levels. Meanwhile, as nuclear genes among MEP pathway, PhDXS and PhDXR could provide a new way of thinking to research the problem of chromalveolata biological evolution.