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Novel load balancing DHT scheme for the heterogeneous system

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Journal of Systems Engineering and Electronics 2008年第4期19卷 835-842页

作者： li yujun Lu Xianliang Hou Mengshu School of Computer Science and Engineering Univ. of Electronics Science and Technology of China Chengdu 610054 P. R. China

The capacities of the nodes in the peer-to-peer system are strongly heterogeneous, hence one can benefit from distributing the load, based on the capacity of the nodes. At first a model is discussed to evaluate the load balancing of the heterogeneous system, and then a novel load balancing scheme is proposed based on the concept of logical servers and the randomized binary tree, and theoretical guarantees are given. Finally, the feasibility of the scheme using extensive simulations is proven.

关键词： distributed hash table heterogeneity randomized binary tree load balancing

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加固软土地基路堤分层填筑数值模拟分析

山西建筑 2025年第3期51卷 108-110,118页

作者：赫林李俊李玉君无锡新立鸿工程技术服务有限公司江苏无锡214000 江苏联合职业技术学院无锡交通分院江苏无锡214151

以江苏某高速公路为研究背景,采用水泥土搅拌桩、土工格栅以及0.5 m砂垫进行地基处理,运用有限元软件PLAXIS分析分层填筑施工过程后路基土竖向沉降、水平位移变形规律。研究结果表明:采用水泥土搅拌桩处理后的竖向沉降量降低了45.6%;处... 详细信息

以江苏某高速公路为研究背景,采用水泥土搅拌桩、土工格栅以及0.5 m砂垫进行地基处理,运用有限元软件PLAXIS分析分层填筑施工过程后路基土竖向沉降、水平位移变形规律。研究结果表明:采用水泥土搅拌桩处理后的竖向沉降量降低了45.6%;处理后的水平位移为未处理前的39%,且最大水平位移出现的位置由路堤脚趾处向下移动至水泥土搅拌桩底部位置;分层填筑施工过程中,每填筑一层水平位移和竖向位移均出现一定程度的增长,离路堤中心距离越远,竖向位移影响越小,水平位移呈现先增大后减小的变化趋势。

关键词：数值模拟水泥土搅拌桩分层填筑位移路堤

Deliverability analysis of greedy routing in the spherical cap 3D sensor networks

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Science China(Information Sciences) 2013年第7期56卷 52-63页

作者： HOU MengShu YANG Yaling li yujun School of Computer Science and Engineering University of Electronic Science and Technology of China Department of Electrical and Computer Engineering Virginia Polytechnic Institute and State University

For 3D sensor networks to monitor the ocean, forest and aerosphere, etc., sensors can forward their data to the base station by greedy routing. It is critical to quantitatively greedy routing’s deliverability for evaluating network’s functionality and performance. The probability that all sensors can successfully send their data to the base station by greedy routing is usually modeled as the probability of guaranteed delivery. For a typical spherical cap 3D sensor network deployment scenario where nodes follow a homogeneous Poisson point process, the relationship between the sensor transmission radius and the probability of guaranteed delivery is studied, and a tight analytical upper bound on the sensor transmission radius to ensure the designed deliverability probability is derived in this paper. The correctness and tightness of the derived upper bound are verified by extensive simulations.

关键词： 3D sensor network greedy routing deliverability probability critical transmission radius

Confinement synthesis of bimetallic MOF-derived defect-rich nanofiber electrocatalysts for rechargeable Zn-air battery

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Nano Research 2022年第10期15卷 9000-9009页

作者： Xing Chen Jie Pu Xuhui Hu Le An Jianjun Jiang yujun li School of Mechanical Engineering Northwestern Polytechnical UniversityXi’an 710072China Frontiers Science Center for Flexible Electronics Institute of Flexible ElectronicsNorthwestern Polytechnical UniversityXi’an 710072China College of Chemistry and Molecular Sciences Wuhan UniversityWuhan 430072China

Zn-air batteries with high energy density and safety have acquired enormous attention,while the practical application is hindered by the sluggish kinetics of the oxygen evolution reaction(OER)and the oxygen reduction reaction(ORR).In this work,a threedimensional(3D)defect-rich bifunctional electrocatalyst(CoFe/N CNFs)comprising irregular hollow CoFe nanospheres in Ndoped carbon nanofibers is presented,which is fabricated from CoFe ZIFs-derived(ZIF:zeolitic-imidazolate framework)polymer nanofibers *** CoFe ZIFs with tunable particle size and composition are constructed using a confined synthesis ***,the Kirkendall diffusion process is available for forming the irregular hollow CoFe nanospheres,and the decomposition of polyvinylpyrrolidone(PVP)results in forming the defective carbon nanofibers,which provide more efficient active sites and enhance the electrocatalytic properties toward both OER and *** optimized CoFe/N CNFs exhibit superior bifunctional activities,outperforming that of the benchmark Pt/C+RuO_(2) *** a result,the CoFe/N CNFs as an air-cathode endow the rechargeable Zn-air battery with an excellent power density of 149 mW·cm^(−2),energy density of 875 Wh·kg^(−1),and cycling *** work provides a new strategy to develop bifunctional electrocatalysts with desired nanostructure and regulated performance toward energy applications.

关键词： defect-rich electrocatalyst hollow structure carbon fiber metal-organic framework Zn-air battery

A novel method to eliminate the bending-induced collapse of hexagonal honeycomb

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Chinese Journal of Aeronautics 2023年第10期36卷 262-274页

作者： yujun li Zhiyong ZHAO Chuang liU Qi liU lishuai SUN Junbiao WANG School of Mechanical Engineering Northwestern Polytechnical UniversityXi’an 710072China AVIC Xi’an Aircraft Industry Group Company Ltd. Xi’an 710089China

A novel grooving method for eliminating the bending-induced collapse of hexagonal honeycombs has been proposed,which lies in determining the appropriate grooving parameters,including the grooving spacing,angle,and *** this end,a framework built upon the experiment-based,machine learning approach for grooving parameters prediction was *** continuously grooved honeycomb bending experiments with various radii,honeycomb types,and thicknesses were carried out,and then the deformation level of honeycombs at different grooving spacing was quantitatively evaluated.A criterion for determining the grooving spacing was proposed by setting an appropriate tolerance for the out-of-plane compression *** was found that as the curvature increases,the grooving spacing increases due to the deformation level of honeycombs being more severe at a smaller bending ***,the grooving spacing drops as the honeycomb thickness increases,and the cell size has a positive effect on the grooving spacing,while the relative density has a negative effect on the grooving ***,the data-driven Gaussian Process(GP)was trained from the collected data to predict the grooving spacing *** grooving angle and depth were calculated using the geometrical relationship of honeycombs before and after ***,the grooving parameters design and verification of a honeycomb sandwich fairing part were conducted based on the proposed grooving method.

关键词： Bending-induced collapse Gaussian process Grooving parameters prediction Hexagonal honeycomb Honeycomb grooving method

Anti-cataract effects of Dajizhi(Euphorbium) eye drops on selenite-induced cataracts in rats

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Journal of Traditional Chinese Medicine 2021年第5期41卷 747-752页

作者： TANG Chengfang GAO Yang Gulibairemu Yusuyin MAO Yan li yujun WANG Yandong GU Zhengyi Key Laboratory of Xinjiang Phytomedicine Resource and Utilization for Ministry of Education School of PharmacyShihezi UniversityShihezi 832000China Xinjiang Institute of Materia Medica Urumqi830002China Department of Pharmacy&State Key Laboratory of Ophthalmology Zhongshan Ophthalmological CenterSun Yat-sen UniversityGuangzhou 510060China College of Pharmacy Xinjiang Medical UniversityUrumqi 830011China Pharmaceutical analysis laboratory Xinjiang Institute of Materia MedicaUrumqi 830002China

OBJECTIVE:To evaluate the effects of Dajizhi(Euphorbium)on selenite-induced ***:Wistar rat pups were divided into 9 *** in group 1 were subcutaneously injected with saline,and rats in the other groups were injected with *** right eye was treated with 5μL eye drops 3 times per day,and the left eye received no *** eyes of rats in group 3 were treated with pirenoxine;rats in groups 4,5,6,7,8 and 9 were respectively treated with Dajizhi(Euphorbium)(25 mg/m L),Dajizhi(Euphorbium)(5 mg/m L),Dajizhi(Euphorbium)methanol extract(25 mg/m L),Dajizhi(Euphorbium)methanol extract(5 mg/m L),euphol(25 mg/m L),euphol(5 mg/m L).Cataracts were observed by a slit lamp before and after *** were acquired at set *** morphological changes of the rat eyes were observed in vitro,and the levels of glutathione peroxidase(GSH-Px)and superoxide dismutase(SOD)in the lenses and aqueous humour were estimated at set ***:Slit lamp examination showed decreased degrees of cataracts after administration of the different *** comparison showed that Dajizhi(Euphorbium)can reduce the turbidity of the lenses,meaning that Dajizhi(Euphorbium)has the anti-cataract ***-concentration of Dajizhi(Euphorbium),its methanol extract and euphol treatment prevented the b-wave amplitudes of the electroretinograms from *** treatment significantly restored GSH-Px and SOD levels in the lenses and aqueous humour,especially after 10 and 25 d of *** may help lenses fight oxidative stress caused by ***:The administration of Dajizhi(Euphorbium)can inhibit selenite-induced cataracts.

关键词： cataract antioxidants electroretinogram Dajizhi(Euphorbium)

Spatial heterogeneity and compositional profiles of dissolved organic matter in farmland soils across China' Mainland

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Journal of Environmental Sciences 2024年第3期137卷 593-603页

作者： Bingjun Han liyuan Chen Kang Xiao Yang liu Dong Cao Lu Yu yujun li Shu Tao Wenxin liu Key Laboratory for Earth Surface Processes College of Urban and Environmental SciencesPeking UniversityBeijing 100871China Beijing Yanshan Earth Critical Zone National Research Station College of Resources and EnvironmentUniversity of Chinese Academy of SciencesBeijing 101408China Center for Water and Ecology State Key Joint Laboratory of Environment Simulation and Pollution ControlSchool of EnvironmentTsinghua UniversityBeijing 100084China State Key Laboratory of Environmental Chemistry and Ecotoxicology Research Center for Eco-Environmental ScienceChinese Academy of SciencesBeijing 100085China

Dissolved organic matter(DOM) plays an essential role in many geochemical processes,however its complexity, chemical diversity, and molecular composition are poorly understood. Soil samples were collected from 500 vegetable fields in administrative regions of China' Mainland, of which 122 were selected for further investigation. DOM properties were characterized by three-dimensional excitation-emission matrix(3D-EEM) fuorescence spectroscopy and Fourier transform ion cyclotron resonance mass spectrometry(FTICRMS)(field intensity is 15 Tesla). Our results indicated that the main constituents were UVA humic-like substances, humic-like substances, fulvic acid-like substances, and tyrosine-like substances. A total of 10,989 molecular formulae with a mass range of 100.04 to 799.59 Da were detected, covering the mass spectrometric information of the soil samples from 27 different regions. CHO and CHON molecules were dominant in DOM, whereas lignin, tannins,and aromatic substances served as the main components. The results of cluster analysis revealed that the soil properties in Jiangxi Province were considerably different from those in other regions. The key backgrounds of the DOM molecular characteristics in the vegetablefield soil samples across China' Mainland were provided at the molecular level, with large abundance and great variability.

关键词： Dissolved organic matter(DOM) Fourier transform ion cyclotron resonance mass(FTICR-MS) Excitation-emission matrix(EEM) Vegetable-field soils China' Mainland

Sirolimus eye drops inhibit acute alkali-burn-induced corneal neovascularization by regulating VEGFR2 and caspase-3 expressions

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Annals of Eye Science 2019年第1期4卷 81-86页

作者： Yang Gao Xiangchao Yao yujun li Chen Cao Chulong Huang Zeli Guo Yandong Wang Department of Pharmacy&State Key Laboratory of Ophthalmology Zhongshan Ophthalmological CenterSun Yat-sen UniversityGuangzhou 510501China

Background:To investigate the effect of sirolimus(SRL)eye drops on acute alkali-burn-induced corneal neovascularization(CNV)and explore its possible ***:A total of 57 male Sprague-Dawley rats weighing 160-180 g were randomly divided into four groups including a normal control group(NC group,n=12),an untreated alkali-burned model control group(MC group,n=15),a blank eye drop treatment group(BT group,n=15),and an SRL eye drop treatment group(ST group,n=15).Corneal inflammation and CNV were observed and scored under a slit-lamp microscope 3,7,and 14 days after alkali *** rats were randomly sacrificed in each group before modeling and 3,7,14 days after modeling,and the corneas of right eyes were harvested for Western blotting to compare the expression levels of VEGFR2 and ***:Corneal inflammation scoring showed that the corneal edema and conjunctival congestion were severe in the MC,BT,and ST groups 1 day after alkali exposure but were alleviated at day *** corneal transparency was significantly higher in the ST group than in the MC and BT groups at days 7(F=9.77,Plimbal vascular network was markedly *** was obvious at days 3,7,and *** new blood vessels were shorter and sparser in the ST group than in the MC and BT groups,and the CNV scores showed significant differences among these groups(day 3:F=8.60,Pling and showed no significant difference among the different groups(F=0.52,P>0.05;F=0.98,P>0.05).The corneal expression of VEGFR2 became significantly higher in the MC and BT groups than in the ST group 3,7,and 14 days after alkali exposure,and there were significant differences in relative gray-scale values among these groups(day 3:F=32.16,P<0.01;day 7:F=85.96,P<0.01;day 14:F=57.68,P<0.01).The increase in the corneal expression of

关键词： Sirolimus(SRL) corneal neovascularization(CNV) eye drops rats

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基于沙地指数模型的沙地监测方法

地球信息科学学报 2021年第4期23卷 680-691页

作者：李宇君张磊中国科学院空天信息创新研究院数字地球重点实验室北京100094 中国科学院大学电子电气与通信工程学院北京100049

沙漠化是干旱、半干旱地区的重要生态环境问题,我国西北地区沙漠化土地分布广泛,加剧的沙漠化问题影响着区域经济和社会的发展,遥感技术的进步为沙漠化评估与制图提供了重要手段。本文以内蒙古自治区浑善达克沙地为研究区,基于面向对象... 详细信息

沙漠化是干旱、半干旱地区的重要生态环境问题,我国西北地区沙漠化土地分布广泛,加剧的沙漠化问题影响着区域经济和社会的发展,遥感技术的进步为沙漠化评估与制图提供了重要手段。本文以内蒙古自治区浑善达克沙地为研究区,基于面向对象方法,对研究区Landsat8 Oli影像进行沙地最优尺度分割。以分割对象为基础,实验在冬夏季影像上分层分阶段提取沙地。在冬季影像上,本文提出新比值型指数RSBI(Ratio Soil Brightness Index)对沙地进行提取,精度较SBI指数提高4.11%。后基于改进型植被覆盖度指数(FMSAVI)与反照率(Albedo)构建二维特征空间,建立沙地分类指数模型(DCI),对夏季影像沙区分类。该方法总体精度为83.24%,较NDVI-Albedo二维特征空间模型精度提高5.59%,较FMSAVI模型提高16.20%。本文结合RSBI指数与FMSAVI-Albedo特征空间反演的DCI指数模型来提取沙地信息并对沙地分类,减少了沙地提取误差,提高了分类精度,为沙地信息的研究提供了新思路。

关键词：面向对象沙化土地沙化指数特征空间分类模型 NDVI MSAVI Albedo