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2013 3rd International Conference on Advanced Measurement and Test, AMT 2013

作者： Xiaoqun, Sun Qiang, Wu xuwen, li Xin, Zheng College of Electronic and Control Engineering of Beijing University of Technology Beijing China College of Life Science and Bioengineering of Beijing University of Technology Beijing China

ISBN: (纸本)9783037857168

This paper introduces the performance metric of DSP parallel processing system and presents a model of coarse-grained speedup of DSP parallel processing structure. Quantitative research is done according to the system performance index and target program features. This study simulates and analyzes different communication protocols and different influences of different degrees of parallelism on the parallel processing structure performances. Optimization direction of parallel processing system is put forward. © (2013) Trans Tech Publications Switzerland.

关键词： Parallel processing systems

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Recent advances in the synthesis of biodegradable polyesters by sustainable polymerization: lipase-catalyzed polymerization

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RSC ADVANCES 2020年第59期10卷 36230-36240页

作者： liu, Ying Song, lijie Feng, Na Jiang, Wei Jin, Yongri li, xuwen Jilin Univ Coll Chem 2699 Qianjin Rd Changchun 130012 Jilin Peoples R China Jilin Prov Acad Tradit Chinese Med Clin Hosp 1 Changchun 130021 Peoples R China Zhengzhou Univ Acad Med Sci Dept Mol Pathol Applicat Ctr Precis MedAffiliated Hosp 2 Zhengzhou 450052 Henan Peoples R China

Over the past three decades, enzymatic polymerization has dramatically developed and gradually broadened as a creative methodology in the construction of polymeric materials with tailor-made structures and properties. Compared with transition metal catalyst polymerizations, enzymatic polymerization is more attractive in the biomedicine field due to the metal-free residue, good biocompatibility, and few by-products. Meanwhile, enzymatic polymerization has far more activity towards macrolides. In this review, the synthesis of lipase-catalyzed polymer materials is systematically summarized, focusing on the synthesis of the complex and well-defined polymers. The enzymatic polyester synthesis was then discussed concerning the different reaction types, including ring-opening polymerization, polycondensation, a combination of ring-opening polymerization with polycondensation, and chemoenzymatic polymerization. Besides, exploration of novel biocatalysts and reaction media was also described, with particular emphasis on the enzymes obtainedviaimmobilization or protein engineering strategies, green solvents, and reactors. Finally, recent developments in catalytic kinetics and mechanistic studies through the use of spectroscopy, mathematics, and computer techniques have been introduced. Besides, we addressed the remaining central issues in enzymatic polymerization and discussed current studies aimed at providing answers.

关键词： Ring opening polymerization

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Inhibitory activity of narirutin on RBL-2H3 cells degranulation

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IMMUNOPHARMACOLOGY AND IMMUNOTOXICOLOGY 2021年第1期43卷 68-76页

作者： Niu, liyan Wei, Jihao li, xuwen Jin, Yongri Shi, Xiaolei Jilin Univ Coll Food Sci & Engn Changchun Peoples R China Jilin Univ Coll Chem Changchun Peoples R China

Context: It is an efficient strategy to apply inhibition of mast cell degranulation for evaluating anti-allergic effects of compounds. Previous works confirmed that narirutin had anti-allergic activity in OVA induced allergic asthma murine model. However, the mechanism is not clear. Objective: Here, inhibitory mechanism of narirutin on RBL-2H3 cells degranulation was investigated. Materials and methods: Cell viability was analyzed by CCK-8 kits, cell degranulation was analyzed by EliSA methods, morphology and ultrastructure of cells was observed by atomic force microscopy, intracellular Ca (2+) concentration was measured by fluorescence microscopre, mRNA expression were measured by PCR, and signaling pathways were measured by WB. Results: The results showed that narirutin have no direct effects on mRNA expression of Fc epsilon RI subunit. However, it inhibited Ca2+ influx by suppressing the phosphorylation of Syk, LAT and PLC gamma 1 signaling pathway transduction. Subsequently, the inhibition of Ca2+ influx directly leads to NF-kappa B signaling pathway transduction decreased. Narirutin can also suppress the phosphorylation of MAPK signaling pathways by decreasing the expression of P-p38, P-ERK and P-JNK, inhibit the synergistic effect for Ca2+ influx, and then reduce the release of IL-4, TNF-alpha, histamine and beta-HEX. Conclusion: Our study suggested that the inhibitory mechanism of narirutin on RBL-2H3 cells degranulation could be related to regulate MAPK, NF-kappa B and Tyrosine kinase signaling pathway.

关键词： Allergy narirutin degranulation mechanism

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An improved inter-prediction motion estimation algorithm of AVS

An improved inter-prediction motion estimation algorithm of ...

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2009 2nd IEEE International Conference on Broadband Network and Multimedia Technology, IEEE IC-BNMT2009

作者： Qiang, Wu Ying, Xu Kebin, Jia xuwen, li College of Electronic and Control Engineering Beijing University of Technology Beijing China

ISBN: (纸本)9781424450053

Research on inter-prediction algorithms is an important respect in the real-time video codec technology. In the regarded studies, the prediction error can be reduced by incorporating high accuracy estimation and compensation algorithms. So the performance of compressed video can be improved. However, this brings a considerable cost for the complexity of encoder. The computation complexity is mainly due to the complexity of motion estimation. The paper presents an improved algorithm with the initialized searching point prediction, half-stop principle, beforehand skip mode decision, reduced search window and optional search model. This algorithm for the integer-pixel motion estimation is provided to reduce computation complexity in the block-matching process. Experimental results show that the proposed algorithm can reduce about 64%-73% of computation complexity compared to full search but only with little PSNR degradation. ©2009 IEEE.

关键词： Motion estimation

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Anti-allergic Effects of Ginsenosides Extracted by High Temperature and High Pressure Method

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Chemical Research in Chinese Universities 2018年第3期34卷 382-388页

作者： liU Ying li xuwen ZHANG Hanqi WU Qian SHI Xiaolei JIN Yongri College of Chemistry Jilin University Changchun 130021 P. R. China College of Food Science and Engineering Jilin University Changchun 130062 P. R. China

Ginseng（Panax ginseng C. A. Mey.） is a traditional medicinal herb in Asia. Studies have shown that ginsenosides significantly affect immnnoregulation and rare ginsenosides have anti-allergic effects. In this research, a high temperature and high pressure method was utilized to increase the contents of rare ginsenosides in the ginseng extract（GE）. The anti-allergic effects of this extract were investigated in vivo. Water was used as the extraction solvent in extracting the rare ginsenosides via the high temperature and high pressure method. Extraction time and temperature were investigated in order to increase the contents of rare ginsenosides. Rare ginsenosides were qualitatively analyzed by HPLC-ESI-MS and quantitatively analyzed by HPLC-UV. Anti-allergic effects of the extracts were assessed using the ovalbumin（OVA）-induced allergic asthma model in vivo. An extraction temperature of 145 ℃ and extraction time of 2.0 h were chosen as the optimal conditions. Compared with traditional method, the contents of total rare ginsenosides extracted were considerably higher using the new method, that is, 14.74 times that extracted by the traditional method. In our in vivo experiments, treatment with high concentration GE may have anti-allergic erects in decreasing the total amount of IgE in serum and IL-4 in bronchoalveolar lavage fluid（BALF）, aud in improving the ratio of CD4^＋ to CD8^＋ T cells. The high temperature and high pressure method was an effective method to obtain GE containing more rare ginsenosides, which maybe become anti-allergic agents.

关键词： Food allergy High temperature and high pressure method Ovalbumin Rare ginsenoside

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A Novel Flavone from the Leaves of Murraya paniculata

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CHEMISTRY OF NATURAL COMPOUNDS 2018年第6期54卷 1061-1063页

作者： li, Peng Zhang, Yue Wang, Ziqi Chen, Honghui li, xuwen Jin, Yongri Jilin Univ Coll Chem Changchun 130012 Jilin Peoples R China

A phytochemical investigation of the leaves of Murraya paniculata (L.) Jack resulted in a novel compound, 3,5-dihydroxy-5,7,4-trimethoxyflavone, together with 13 known compounds. The structure of the novel compound wa... 详细信息

关键词： Murraya paniculata (L.) Jack leaves flavonoids

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DESIGN OF 1553B BUS TESTING and SIMULATING SYSTEM

DESIGN OF 1553B BUS TESTING and SIMULATING SYSTEM

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9th International Conference on Intelligent Information Hiding and Multimedia Signal Processing (IIH-MSP)

作者： Yin, Jie Wu, Qiang Mao, Xuetao Song, Tao li, xuwen Beijing Univ Technol Coll Elect Informat & Control Engn Beijing Peoples R China Beijing Univ Technol Coll Life Sci & Bioengn Beijing Peoples R China

ISBN: (纸本)9780769551203

With the appearance of different manufacturers and types of 1553B bus devices, the problem of the lack of real-time analysis and evaluation of effective tools for bus test method becomes severe. So a set of general configurable and flexible testing and simulating verification system for 1553B bus. In this thesis, a set of real-time hardware and software systems solution is proposed, a novel mechanism of inject fault testing and detect fault is adopted. Besides, the proposed system could receive good performance in practical applications.

关键词： 1553B bus Windows plus RTX Fault injection

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A multi-model object tracking algorithm based on texture and color features 8

A multi-model object tracking algorithm based on texture and...

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8th International Conference on Computing and Pattern Recognition, ICCPR 2019

作者： li, xuwen Xue, Wendong Shi, lijuan Wu, Qiang Beijing University of Technology College of Life Science and Bioengineering Beijing China

ISBN: (纸本)9781450376570

Mean Shift is widely concerned because of its advantages like fast convergence, real-time performance and simple procedure. However, the tracking performance of the traditional Mean Shift algorithm is obviously interfered when the background has the similar color as the target or the illumination changes. Besides, the tracking is easy to defeat in the case of target occlusion and loss of important frames. Therefore, this paper proposes two improvements based on the traditional Mean Shift tracking algorithm. First, the HLBP texture feature and color feature are employed to describe the target feature in order to improve the robustness of the tracking algorithm. Second, multiple models are taken into account to provide more abundant choices for the tracking process which can improve the tacking performance. The result of experiments show that our algorithm is more robust under the case of object occlusion and posture change, and gets better performance in accuracy when the background color and target color are similar or the illumination changes. © 2019 Association for Computing Machinery.

关键词： Color

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Semisynthesis and bioactive evaluation of oxidized products from 20(S)-ginsenoside Rg₃, Rh₂, protopanaxadiol (PPD) and their 20(R)-epimers as cytotoxic agents

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STEROIDS 2016年 106卷 26-34页

作者： Yang, Jie li, xuwen Sun, Ting Gao, Yan Chen, Yanxin Jin, Yongri li, Yang Jilin Univ Coll Chem Changchun 130021 Peoples R China Jilin Univ Coll Life Sci Changchun 130012 Peoples R China

A series of oxidized products have been systematically semisynthesized from 20(S)-ginsenoside Rg(3), Rh-2, 20(S)-protopanaxadiol (PPD) and their 20(R)-epimers and the majority of these products were evaluated for their cytotoxic activity against HeLa cells and HepG2 cells by MIT assay for the first time. Twenty-two products were obtained and elucidated based on comprehensive H-1 NMR, C-13 NMR, two-dimensional (2D) NMR, and mass spectral data and the results reported in previous literature. All the four ocotillol type saponins (203,24R(delta 86, delta 85);205,24S(delta 87, delta 88);20R,24R(delta 86, delta 86);20R,245(delta 86, delta 87) were obtained. In addition, eight compounds (3, 8, 9, 10, 15, 16, 19 and 22) with the cyclized side chain were firstly identified. Most of the tested compounds possessed cytotoxicity to a certain degree against the two types of cells which implied these oxidized products could play a certain role on anti-cancer functions of the raw materials in vivo. Meanwhile, the results proved that the configurations at C-20 or C-24 and the number of glycosyl at C-3 have important influence on the cytotoxicity. The products 1, 2,11-17, 20 and 22 should possess great activities and deserved further investigation as potential cytotoxic agents. (C) 2015 Elsevier Inc. All rights reserved.

关键词： Semisynthesis Oxidation Ginsenoside Ocotillol Saponin Cytotoxicity

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Hardware design of image information processor based on ADSP-TS201 DSPs

Hardware design of image information processor based on ADSP...

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2009 IEEE International Workshop on Imaging Systems and Techniques, IST 2009

作者： Qiang, Wu Qing, Gao xuwen, li Kebin, Jia College of Electronic and Control Engineering Beijing University of Technology Beijing China College of Life Science and Bio-engineering Beijing University of Technology Beijing China

ISBN: (纸本)9781424434831

This paper studies on the hardware design and implementation of a universal multi-DSP and FPGA image information processor in accordance with the PCI-E and CPCI specifications. The image information processor features two clusters of total four ADSP-TS201 TigerSHARC DSPs from ADI as the kernel processing unit, reconfigurable framework implemented by two Xilinx Virtex-5 FXT FPGA chips. Taking full advantage of the high performance, unprecedented I/O bandwidth of TigerSHARC DSP and Virtex-5 FXT FPGA, the processor can easily meet the huge image processing and computing work. The hardware design of high speed linkport interconnection between TS201 DSPs and FPGA chips is described. © 2009 IEEE.

关键词： Field programmable gate arrays (FPGA)

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