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Shuwen Wang,Huiqi Cao,Yao Liu 대한전자공학회 2023 IEIE Transactions on Smart Processing & Computing Vol.12 No.2
Under the background of today’s intelligence, the application of intelligent images is becoming popularized, and the detection of multi-source information images is a valuable research topic. Current image detection methods are insensitive and inaccurate. Therefore, the research combines the SIFT (scale-invariant feature transform) algorithm with the Gabor features and CNN (convolutional neural network (Ed note. Acronyms only need to be defined once.)) to form an improved new algorithm. The algorithm divides the features of the image into several different categories. In each category, the features will be fully identified and extracted, and different levels of feature matching will be performed. The properties of the SIFT algorithm are used to form an operational stacking pyramid and combine the Gabor features and CNN with it. The Gabor filter is formed into a filter bank to obtain parameters, including frequency, scale, and direction in various dimensions. The results are fused to obtain a fusion Gabor descriptor. The high sensitivity of CNN to images, particularly colors, is applied to the algorithm to make monitoring the algorithm more accurate. The experimental results show that the average precision rate, average recall rate, and average precision rate of the improved algorithm are 92.35%, 74.79%, and 82.55%, respectively, which are significantly higher than the other two algorithms used for comparison. The improved algorithm shows better performance and has remarkable advantages that can be applied to the image monitoring of image information.
Dibenzothiophene hydrodesulfurization over MoP/SiO2 catalyst prepared with sol-gel method
Shuwen Gong,Lijun Liu,Haifeng He,Qingxin Cui 한국화학공학회 2010 Korean Journal of Chemical Engineering Vol.27 No.5
Silica-supported molybdenum phosphide, MoP/SiO2 catalysts with different Mo weight loadings were prepared by temperature programmed reduction of the oxidic catalyst precursors, which were prepared via sol-gel technique using ethyl silicate-40 as silica source. Samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), BET surface area measurements, and their catalytic activity in hydrodesulfurization (HDS)was tested with dibenzothiophene (DBT) as model compound. XRD analysis revealed the amorphous nature of the catalyst up to 10 wt% Mo loading and the formation of crystalline MoP phase on amorphous silica support with higher Mo loading. BET surface area showed high surface area for catalysts prepared by sol-gel technique with lower Mo content, and the surface area decreased with increasing in Mo loading. The HDS results showed that prepared MoP/SiO2 exhibited high HDS activity and stability toward the catalytic test. Among the series of catalysts prepared, MoP/SiO2 containing 20 wt% Mo was found to be the most active catalyst. And the effects of reaction temperature and hydrogen pressure on conversion and product selectivity were investigated.
Dongliang Yu,Kan Shi,Xiangyuan Wen,Fangshu Xie,Tao Wang,Shuwen Liu,Ling He 한국미생물학회 2018 The journal of microbiology Vol.56 No.8
Studies of the genetic diversity and population structure of Oenococcus oeni (O. oeni) strains from China are lacking compared to other countries and regions. In this study, amplified fragment length polymorphism (AFLP) and multilocus sequence typing (MLST) methods were used to investigate the genetic diversity and regional evolutionary patterns of 38 O. oeni strains isolated from different wine-making regions in China. The results indicated that AFLP was markedly more efficient than MLST for typing O. oeni strains. AFLP distinguished 37 DNA patterns compared to 7 sequence types identified using MLST, corresponding to discriminatory indices of 0.999 and 0.602, respectively. The AFLP results revealed a high level of genetic diversity among the O. oeni strains from different regions of China, since two subpopulations and an intraspecific homology higher than 60% were observed. Phylogenetic analysis of the O. oeni strains using the MLST method also identified two major phylogroups, which were differentiated into two distinct clonal complexes by minimum spanning tree analysis. Neither intragenic nor intergenic recombination verified the existence of the clonal population structure of the O. oeni strains.
Shanti Marasini,Huan Yue,Son Long Ho,차현실,박지애,Ki-Hye Jung,Adibehalsadat Ghazanfari,Mohammad Yaseen Ahmad,Shuwen Liu,채권석,장용민,이강호 대한화학회 2020 Bulletin of the Korean Chemical Society Vol.41 No.8
Until now, there have been limited studies on T2 magnetic resonance imaging (MRI) contrast agents (CAs) using paramagnetic nanoparticles (NPs). In this study, ultrafine dysprosium oxide (Dy2O3) NPs were synthesized as a T2 MRI CA. To obtain high biocompatibility and colloidal stability in aqueous medium for in vivo applications, they were grafted with polyacrylic acid. They displayed paramagnetism with an appreciable magnetization value at 300?K and consequently, an appreciable transverse water proton spin relaxivity (r2) value which increased as the applied MR field increased. Their potential as a T2 MRI CA was proved by taking in vivo T2 MR images in mice.
Ghazanfari, Adibehalsadat,Marasini, Shanti,Miao, Xu,Park, Ji Ae,Jung, Ki-Hye,Ahmad, Mohammad Yaseen,Yue, Huan,Ho, Son Long,Liu, Shuwen,Jang, Yeong Ji,Chae, Kwon Seok,Chang, Yongmin,Lee, Gang Ho Elsevier 2019 Colloids and surfaces. A, Physicochemical and engi Vol.576 No.-
<P><B>Abstract</B></P> <P>Ultrasmall heavy metal oxide nanoparticles are potential candidate materials for X-ray computed tomography (CT) contrast agents because they possess high X-ray attenuation powers owing to high X-ray attenuation coefficients of heavy metal atoms and high density of heavy metal atoms per nanoparticle. In this study, five kinds of polyacrylic acid (PAA)-coated ultrasmall heavy metal oxide (Bi<SUB>2</SUB>O<SUB>3</SUB>, Yb<SUB>2</SUB>O<SUB>3</SUB>, NaTaO<SUB>3</SUB>, Dy<SUB>2</SUB>O<SUB>3</SUB>, and Gd<SUB>2</SUB>O<SUB>3</SUB>) nanoparticles were synthesized and their X-ray attenuation properties were investigated. The estimated average particle diameters were 2.3 ± 0.1, 1.7 ± 0.1, 1.5 ± 0.1, 1.8 ± 0.1, and 1.9 ± 0.1 nm for PAA-coated ultrasmall Bi<SUB>2</SUB>O<SUB>3,</SUB> Yb<SUB>2</SUB>O<SUB>3</SUB>, NaTaO<SUB>3</SUB>, Dy<SUB>2</SUB>O<SUB>3</SUB>, and Gd<SUB>2</SUB>O<SUB>3</SUB> nanoparticles, respectively. All of the nanoparticle suspension samples exhibited a high colloidal stability, a high biocompatibility, and X-ray attenuation powers which were stronger than that of a commercial iodine contrast agent Ultravist<SUP>®</SUP> at the same atomic concentration and much stronger, at the same number density. The effectiveness of the nanoparticle suspension samples as CT contrast agents was demonstrated by acquiring in vivo CT images by using one of the samples (i.e., PAA-coated ultrasmall Bi<SUB>2</SUB>O<SUB>3</SUB> nanoparticles). After intravenous injection into the mouse tail vein, positive contrast enhancements in various organs were observed.</P> <P><B>Graphical Abstract</B></P> <P>[DISPLAY OMISSION]</P>