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Polynomial Analysis of DH Secrete Key and Bit Security

Wuhan University Journal of Natural Sciences 2005年第1期10卷 239-242页

作者： JIANGZheng-tao xuwen-li WANGYu-min NationalKeyLaboratoryofIntegratedServiceNetworksXidianUniversity Xi＇an710071ShaanxiChina

In this paper, we lower the upper bound of the number of solutions of oracletransformation polynomial F(x) over GF(q) So one can also recover all the secrete keys with fewercalls We use our generalized ' even-and-odd test' method to recover the least significant p-adic'bits' of representations of the Lucas Cryptosystem secret keys x Finally, we analyze the EfficientCompact Subgroup Trace Representation (XTR) Diffic-Hellmen secrete keys and point out that if theorder of XIR-subgroup has a specialform then all the bits of the secrete key of XIR ean be recoveredform any bit of the exponent x.

关键词： public-key cryptosystem security analysis polynomial transformation bitsecurity Diffie-Hellman oracle

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Novel graphite sheet used as an anodic material for high-performance microbial fuel cells

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MATERIALS LETTERS 2013年 105卷 24-27页

作者： Gao, Xia Zhang, Yezhen li, xuwen Ye, Jianshan S China Univ Technol Coll Chem & Chem Engn Guangzhou 510641 Guangdong Peoples R China

Novel graphite sheet (GTS) has been used as anodic catalyst in microbial fuel cell (MFC) base on Escherichia coli (ATCC 25922) and characterized by cyclic voltammogram (CV) and polarization curve. Findings from these measurements revealed that GTS showed an excellent electrochemical performance. The two-chambered MFC operated with the GTS anode delivered a maximum power density of 2249 mW/m(2). Scanning electron microscopy (SEM) results indicate that the high power output could be attributed to the high biocompatibility of the GTS. These results demonstrate that the GTS is promising in the application of microbial fuel cells. (C) 2013 Elsevier B.V. All rights reserved.

关键词： Novel graphite sheet Microbial fuel cell Carbon materials Biomaterials

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Research on Image Matching Algorithm Based on Local Invariant Features

Research on Image Matching Algorithm Based on Local Invarian...

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

作者： liu, Jiaqi Wu, Qiang 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

As an important foundation for image-guided technology, image matching technique is the key technology of modern war. This paper proposes a new algorithm of affine invariant detector and descriptor of local invariant feature points, starting from feature point detection and description point of view, making up the traditional feature point extraction defects of small number and types. Meantime, proposes an improved similarity measure method based on the previously proposed new feature point detection and description algorithm, it improves the matching accuracy and real-time performance. Finally, compares the experiment results of SURF, SIFT and the improved algorithm proposed in this paper, the experimental results shows that the feature points extracted by the improved algorithm has fully affine invariance, and improved the accuracy and speed of image matching algorithm efficiently.

关键词： local invariant feature affine invariance image matching

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Research Progress of Obstacle Detection Based on Monocular Vision 10

Research Progress of Obstacle Detection Based on Monocular V...

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10th International Conference on Intelligent Information Hiding and Multimedia Signal Processing (IIH-MSP)

作者： Wu, Qiang Wei, Jie 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)9781479953905

In recent years, unmanned autonomous vehicle navigation technology or UAV research is a hot topic in the field of machine vision, and obstacle detection is the basis of autonomous navigation. In this thesis, the author analyzed the deficiency of stereoscopic vision and classified current monocular obstacle detection algorithms. According to the properties of algorithms, this paper elaborated the function of algorithms based on features, focal length and movements respectively. The author also discussed current situation and prospects for various types of algorithms, including feature extraction and matching, focusing and defocusing model, background subtraction, frame difference and optical flow. Finally, this paper summarized advantages and disadvantages of different autonomous navigation algorithm and discussed the prospect of the monocular obstacle detection technology.

关键词： monocular vision obstacle detection feature Matching optical flow

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A modified image matching algorithm based on robust Hausdorff distance

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High Technology Letters 2014年第1期20卷 29-33页

作者：吴强 Wu Xuefeng li xuwen Jia Kebin College of Electronic Information and Control Engineering Beijing University of Technology College of Life Science and Bio-engineering Beijing University of Technology

Hausdorff distance measure is one of the widely adopted feature-based image matching algo- rithms due to its simplicity and accuracy. However, it is considered that its robustness still needs to be improved. In this paper, various forms of original and improved Hausdorff distance （HD） and their limitations are studied. Focusing on robust Hausdorff distance （ RHD）, an improved RHD with an adaptive outlier point threshold selection method is proposed. Furthermore, another new form of the Hausdorff distance which possesses the merits of RHD and M-HD is prsented. Finally, a recur- sire algorithm is introduced to accelerate the image matching speed of Hausdorff algorithms. Exten- sive simulation and experiment results are presented to validate the feasibility of the proposed Haus- dorff distance algorithm.

关键词： Hausdorff distance （HD） robust Hausdorff distance （RHD） adaptive outlierpoint threshold matching speed

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Stereo matching algorithm of Color Image Based on Weber's law and Census 10

Stereo matching algorithm of Color Image Based on Weber's la...

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10th International Conference on Intelligent Information Hiding and Multimedia Signal Processing (IIH-MSP)

作者： Wu, Qiang Zhao, Xiangnan 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)9781479953905

The algorithm presented here is used on unmanned aerial vehicles system. In 2013,*** proposed a matching cost computation model(or function), This matching cost model combined three kinds of constraints, the cost function is formulated by combining three individual costs: a cost computed on an extended census transformation of the images;the absolute difference cost, taking into account information from colour channels;and a cost based on the principal image derivatives. Experiments show that the cost function is excellent performance in similar estimates. Apply it to the stereo matching of ancient buildings, it is favorable for practical. However, this experiment, in color mutated region, leaded to blurred border. Therefore, our proposed method added color space structural information, which based on HVS Weber's law, to the cost function. we use the differential excitation of WLD reflects the structure of color space. This robust cost measures can reduce percent of bad pixels in mutated color region. The proposed method use color image, which is used after epipolar line rectification.

关键词： The stereo matching of color image Census Weber's law

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Two New Baccharane Glycosides from Seeds of Impatientis balsamina L. with in vitro Growth Inhibitory Activity in Human Cancer A375 Cells

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Chemical Research in Chinese Universities 2017年第5期33卷 753-757页

作者： WU Oian JIN Yongri YAO Hua liU Ying li Peng li xuwen College of Chemistry Jilin University Changchun 130021 P R. China Scientific Research Center China-Japan Union Hospital of Jilin University Changchun 130021 P. R. China

Two new baccharane-type glycosides（1 and 2）, together with seven known baccharane-type glycosides （3u9） hosenkoside A, hosenkoside B, hosenkoside C, hosenkoside F, hosenkoside M, hosenkoside K and hosenko- side G were isolated from the dried seeds of Impatientis balsamina L. The new baccharane-type glycosides were identified as honsenkol A-3-O-β-D-glucopyranosyl-26-O-p-D-glucopyranosyl-28-O-β-D-glucopyranosyl-O-β-D- glucopyranosyl（1） and （3S,4R,17R,20S）17-hydrroxy-3-O-β-D-xylopyranose（12）-β-D-glucopyranosyl-26-O-β-D- glucopyranosyl-28-O-β-D-glucopyranosyl-21,24-epoxybaccharane（2）, respectively, by spectroscopic methods, in- cluding NMR（1D and 2D）, IR and HR-ESI-MS. Compounds 1 and 2 were evaluated for in vitro inhibitory activity against the cell lines. Compound 2 with a new baccharane skeleton had anti-hepatic fibrosis activity against A375 cells in bioassay results, which means the new compounds have potential value in antitumor applications.

关键词： Impatientis balsamina L. Seed Baccharane-type glycoside Cytotoxic activity

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Graphene-encapsulated silica as matrix solid-phase dispersion extraction sorbents for the analysis of poly-methoxylated flavonoids in the leaves of Murraya panaculata (L.) Jack

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JOURNAL OF SEPARATION SCIENCE 2015年第12期38卷 2132-2139页

作者： Sun, Ting li, xuwen Yang, Jie li, Lanjie Jin, Yongri Shi, Xiaolei Jilin Univ Coll Chem Changchun 130062 Peoples R China Jilin Univ Coll Quartermaster Technol Changchun 130062 Peoples R China

In this study, graphene-encapsulated silica was synthesized by a hydrothermal reduction strategy. The presence of silica in graphene was identified by Fourier-transform infrared spectrometry, X-ray diffraction and scanning electron microscopy. The graphene-encapsulated silica subsequently was used as adsorbent for matrix solid-phase dispersion extraction of poly-methoxylated flavonoids from the dried leaves of Murraya panaculata (L.) Jack. Compared with the other adsorbents (graphene, silica gel, C-18 silica, neutral alumina, diatomaceous earth) and without any adsorbents, better results were obtained. Then a method for analysis of poly-methoxylated flavonoids was established by coupling matrix solid-phase dispersion extraction with ultra high performance liquid chromatography and UV detection. Compared with reflux extraction and ultrasonic extraction, the proposed method is quicker, more efficient and more environmental protection. Less than 10 min is needed from extraction to detection.

关键词： Flavonoids Graphene Matrix solid-phase dispersion Murraya panaculata Traditional Chinese medicine

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New type three-dimension silicon piezoresistive accelerometer

New type three-dimension silicon piezoresistive acceleromete...

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Proceedings of the 1999 3rd International Symposium on Test and Measurement, ISTM-99

作者： Xiong, Jijun li, xuwen Zhang, Wendong North China Inst of Technology Taiyuan China

A new type high-g(10000g) three-dimension silicon piezoresistive accelerometer is introduced in this paper. The sensor's principle, structure, mechanical analysis and measurement circuit are described. Finally, fa... 详细信息

ISBN: (纸本)7800034410

关键词： Accelerometers

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Dispersive solid-phase extraction of organophosphorus pesticides from apple, cucumber and water samples using reduced graphene oxide coated with ZnO nanocomposites as a sorbent

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ANALYTICAL METHODS 2015年第15期7卷 6095-6102页

作者： Sun, Ting Jin, Yongri Yang, Jie li, Lanjie Shi, Xiaolei li, xuwen Jilin Univ Coll Chem Changchun 130021 Peoples R China Jilin Univ Coll Quartermaster Technol Changchun 130062 Peoples R China

In this work, reduced graphene oxide coated with ZnO (RGO-ZnO) nanocomposites was synthesized by a hydrothermal reduction strategy. The presence of ZnO was characterized by Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), thermogravimetric analysis (TGA), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). Subsequently, RGO-ZnO was used as a dispersive solid-phase extraction (DSPE) sorbent for the enrichment of eight organophosphorus pesticides (OPs) in apple, cucumber and water samples prior to their determination by gas chromatography-mass spectrometry (GC-MS). Several experimental parameters affecting the extraction efficiencies, including the amount of RGO-ZnO, extraction time, and the pH of the sample solution, as well as the type and volume of eluent solvent, were investigated and optimized in this work. Under the optimal experimental conditions, good linearity existed in the range of 0.5-200.0 ng g(-1) for all the analytes with the correlation coefficients (R-2) ranging from 0.9894 to 0.9983. The limits of detection (S/N = 3) of the method for the compounds were between 0.01 and 0.05 ng g(-1). Good reproducibilities were acquired with the relative standard deviations (RSDs) below 8.6% for both intra-day and inter-day precision. The recoveries of the method were in the range of 75.0% to 104.2%.

关键词： Nanocomposites

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