The Effect of Web2.0 on Learning Management System

Li Chunyan,Cui Haitao,Li Guolin 보안공학연구지원센터 2014 International Journal of Multimedia and Ubiquitous Vol.9 No.10

Two new triterpenoid saponins derived from the leaves of Panax ginseng and their antiinflammatory activity

Li, Fu,Cao, Yufeng,Luo, Yanyan,Liu, Tingwu,Yan, Guilong,Chen, Liang,Ji, Lilian,Wang, Lun,Chen, Bin,Yaseen, Aftab,Khan, Ashfaq A.,Zhang, Guolin,Jiang, Yunyao,Liu, Jianxun,Wang, Gongcheng,Wang, Ming-Kui The Korean Society of Ginseng 2019 Journal of Ginseng Research Vol.43 No.4

Background: The leaves and roots of Panax ginseng are rich in ginsenosides. However, the chemical compositions of the leaves and roots of P. ginseng differ, resulting in different medicinal functions. In recent years, the aerial parts of members of the Panax genus have received great attention from natural product chemists as producers of bioactive ginsenosides. The aim of this study was the isolation and structural elucidation of novel, minor ginsenosides in the leaves of P. ginseng and evaluation of their antiinflammatory activity in vitro. Methods: Various chromatographic techniques were applied to obtain pure individual compounds, and their structures were determined by nuclear magnetic resonance and high-resolution mass spectrometry, as well as chemical methods. The antiinflammatory effect of the new compounds was evaluated on lipopolysaccharide-stimulated RAW 264.7 cells. Results and conclusions: Two novel, minor triterpenoid saponins, ginsenoside $LS_1$ (1) and 5,6-didehydroginsenoside $Rg_3$ (2), were isolated from the leaves of P. ginseng. The isolated compounds 1 and 2 were assayed for their inhibitory effect on nitric oxide production in LPS-stimulated RAW 264.7 cells, and Compound 2 showed a significant inhibitory effect with $IC_{50}$ of $37.38{\mu}M$ compared with that of NG-monomethyl-L-arginine ($IC_{50}=90.76{\mu}M$). Moreover, Compound 2 significantly decreased secretion of cytokines such as prostaglandin $E_2$ and tumor necrosis factor-${\alpha}$. In addition, Compound 2 significantly suppressed protein expression of inducible nitric oxide synthase and cyclooxygenase-2. These results suggested that Compound 2 could be used as a valuable candidate for medicinal use or functional food, and the mechanism is warranted for further exploration.

Identification of a nuclear-recessive gene locus for male sterility on A2 chromosome using the Brassica 60 K SNP array in nonheading Chinese cabbage

Guolin Zhou,Xia Li,Aihua Wang,Feng Zu,Zhenhua Hu,Jiazao Lin,Jinxing Tu 한국유전학회 2016 Genes & Genomics Vol.38 No.12

WS24-3 is a newly bred recessive genic male sterility line of the non-heading Chinese cabbage (Brassica rapa ssp. chinensis). Here, an F2 population was produced from the cross between WS24-3 and a male-fertile breeding line (WS135). The Illumina Brassica 60 K single nucleotide polymorphism (SNP) array was used for SNPs detecting between sterile and fertile bulks from the F2 population, and 62 SNPs were identified. BLAST analysis of the 62 SNPs revealed that the A2 chromosome of Brassica rapa genome contained 22 SNPs, whereas the other chromosomes did not contain more than 6 SNPs each. These data indicated that the potential target gene locus, named Bra2Ms, might be located on A2. Based on 10 of the 22 SNPs, allele-specific-polymerase chain reaction (AS-PCR) primers and single sequence repeat (SSR) primers were designed, 5 AS-PCR primers and 9 SSR primers showed difference between the bulks in electrophoretic determination. Analysis of these markers in F2 population revealed that Bra2Ms was genetically delimited to a region of 1.2 cM. We also detected two co-segregated markers SSRa2-951 and SSRa2-960 in this region. The markers identified in our study might facilitate the transfer of recessive genic male sterility alleles to other favorable genetic backgrounds. Furthermore, these markers will support a map-based clone of Bra2Ms.

Cell Virtualization with Network Partition for Initial User Association in Software Defined Small-cell Networks

( Guolin Sun ),( Li Lu ),( Daniel Ayepah-mensah ),( Xiufen Fang ),( Wei Jiang ) 한국인터넷정보학회 2018 KSII Transactions on Internet and Information Syst Vol.12 No.10

In recent years, dense small cell network has been deployed to address the challenge that has resulted from the unprecendented growth of mobile data traffic and users. It has proven to be a cost efficeient solution to offload traffic from macro-cells. Software defined heterogeneous wireless network can decouple the control plane from the data plane. The control signal goes through the macro-cell while the data traffic can be offloaded by small cells. In this paper, we propose a framework for cell virtualization and user association in order to satisfy versatile requirements of multiple tenants. In the proposed framework, we propose an interference graph partioning based virtual-cell association and customized physical-cell association for multi-homed users in a software defined small cell network. The proposed user association scheme includes 3 steps: initialization, virtual-cell association and physical-cell association. Simulation results show that the proposed virtual-cell association outperforms the other schemes. For physical-cell association, the results on resource utilization and user fairness are examined for mobile users and infrastructure providers.

Facile Fabrication of Non-fluorinated Durable Superhydrophobic Cotton Fabric

Guolin Zheng,Yuhe Wu,Dan Zhang,Shuai Liu,Zhu Long,Rong Li 한국섬유공학회 2020 Fibers and polymers Vol.21 No.11

The superhydrophobic surface is easy to lose the superhydrophobicity in the practical applications, due to the factthat the micro- and nanoscale rough structure is easily damaged. Therefore, it is one of the challenges to endow solid surfacewith durable superhydrophobic property. In this work, the environment-friendly superhydrophobic cotton fabric was preparedby dip-coating methodology. Meanwhile, the cotton fabric was endowed with durable superhydrophobicity. Herein, theoctadecylamine was utilized to reduce the surface free energy of cotton fabric. However, octadecylamine was only adsorbedon the fabric surface. Therefore, the hydrophobic resin was employed to supply enough adhesion force. As a result, thelimitation that traditional methods frequently utilize additional nanoparticles to construct hierarchical rough surfaces wasbroken. The water contact angles of the coated cotton fabric at room temperature and 70 oC reached 154.4±0.6 o and120±1.1 o, respectively. Moreover, the coated cotton fabric still reserved superhydrophobic property after 30th cycle’sabrasion and exhibited excellent hydrophobicity after 500th cycle’s abrasion. In addition, the surface free energy of originalcotton fabric reduced by 54.7 % so that the coated cotton fabric had outstanding repellency to hydrochloric acid, sodiumhydroxide solution, coffee and sodium chloride solution, respectively.

Effect of HPAM on Calcium Carbonate Crystallization

Jing, Guolin,Tang, Shan,Li, Xiaoxiao Korean Chemical Society 2013 대한화학회지 Vol.57 No.3

With the wide application of ASP (alkaline-surfactant-polymer) flooding, the scaling becomes more and more serious, which is harmful to the oilfield and environment. In order to investigate the effects of HPAM on calcium carbonate crystallization, the crystallization behaviors of $CaCO_3$ in HPAM (Hydrolyzed polyacrylamide) solutions were studied and the composition and morphology of $CaCO_3$ crystal were investigated in different concentrations of polyacrylamide solutions. The crystal forms and morphologies of $CaCO_3$ were characterized by Fourier transform infrared spectroscopy, X-ray diffraction and scanning electron microscopy. The results show that the crystallization of $CaCO_3$ is strongly influenced by the HPAM. The paper analyzed the internal cause, and the results show: The reasons leading to the change of morphology are carboxyl groups in polyacrylamide molecule and $Ca^{2+}$ in solution form chelates by coordination bond. And the chelates are adsorbed on the calcium hydroxide surfaces of solid-liquid interfaces so as to change the formation rate of calcium carbonate crystal nucleus. The research provides a reliable basis for the mechanism research of the scaling problem in the oil extraction process of ASP flooding and the adoption of scale inhibition and scale inhibitor.

Effects of spherical adsorbent fluidization and self-rotation on removal of VOCs in a cyclonic fluidized bed

Liang Ma,Guolin Xiang,Yuan Huang,Meng-Ya He,Jianping Li,Pengbo Fu 한국공업화학회 2020 Journal of Industrial and Engineering Chemistry Vol.85 No.-

Afluidized bed has the advantages of treating largeflows, intensifying mass and heat transfer, andlowering costs. This study proposed a cyclonicfluidized bed packed with spherical activated carbonadsorbents for volatile organic compounds adsorption. Thefluidization and self-rotation of the ACparticles in a 25 mm cyclonicfluidized bed were studied with high-speed camera testing technology. Theeffects of the particle movement on the adsorption efficiency of toluene were also tested. The resultsshow that most of the particles at the inlet side of the cyclonicfluidized bed were moving up when theinlet airflow rate was greater than 2.0 m3/h. The particles began to move in clusters when the relativepacking height increased to a critical value of 0.57. Increasing the gasflow rate and the diameter andheight of the core column will increase the self-rotation speed of the total particles. The maximum selfrotationspeed of spherical adsorbents reached 1700 rad/s at the inletflow rate of 2.5 m3/h. In the case ofthe same axial velocity of the gas phase in the upper space of the core column, increasing the particle selfrotationspeed can slightly improve the adsorption efficiency. The maximum adsorption efficiencyreached 99% when the inletflow rate is 1.0 m3/h with relative packing height 0.65.

INFLUENCE OF TIRE BELT LAYER PRESSURE SHARE RATIO ON TIRE CONTOUR AND PERFORMANCE BASED ON NEW NON-NATURAL EQUILIBRIUM CONTOUR THEORY

Liang Chen,Li Han,Yang Jian,Wang Guolin,Zhang Lingxin 한국자동차공학회 2023 International journal of automotive technology Vol.24 No.2

Tire contour design theory has always been studied because of its significant effect on tire performance. Based on the new non-natural equilibrium contour theory, the influence of belt pressure share ratio on the carcass contour is studied. The type of 385 / 65R22.5 all-steel radial tire was chosen as the research object and the finite element analysis technique was adopted to calculate the belt pressure share ratio. The results show that with the increase of the belt pressure share ratio, the clamping effect of belt layer on the carcass is strengthened, the curvature of tire crown in carcass contour increases and the crown curve tends to be rounded. The influence of belt pressure share ratio on wear, footprint, rolling resistance and grip performance was also explored with the finite element technology. It turned out that with the increase of the belt pressure share ratio, the tire wear increased, rolling resistance reduced, grip performance enhanced.

Optimization Analysis on Distribution of Temperature of a Corn Based on Fluent

DanHua Zhao,GuoLin Li,NianFeng Li 보안공학연구지원센터 2016 International Journal of Smart Home Vol.10 No.6

Traditional method of drying corn is using higher temperature to dry quickly. But high drying temperature can make the corn lost nutrients. Provide the foundation of designing a new corn drier which can dry corn efficient as well as sustain nutrition.Optimization analysis on distribution of temperature of a corn by Fluent. It shows that:1).Hot winds is 0.8m/s,temperature is 343K. Temperature distributions of corn is evenlier. The highest temperature is below 333K.2).More fluid inlet make corn evenlier. Change the angle between corn and velocity vector will not impact the temperature distributions of corn.

A Low-Complexity and High-Quality Image Compression Method for Digital Cameras

Xiang Xie,Guolin Li,Zhihua Wang 한국전자통신연구원 2006 ETRI Journal Vol.28 No.2

This letter proposes a new near-lossless image compression method with only one line buffer cost for a digital camera with Bayer format image. For such format data, it can provide a low average compression rate (4.24bits/pixel) with high-image quality (larger than 46.37dB where the error of every pixel is less than two). The experimental results show that the near-lossless compression method has better performance than JPEG-LS (lossless) with δ = 2 for a Bayer format image.