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Analyzing the dynamics of online video popularity

The Journal of China Universities of Posts and Telecommunications 2017年第3期24卷 58-69页

作者： Ouyang Shuxin li chenyu li Xueming School of Information and Communication Engineering Beijing University of Posts and Telecommunications Beijing Key Laboratory of Network System and Network Culture Beijing University of Posts and Telecommunications

Given the large volume of video content and the diversity of user attention, it is of great importance to understand the characteristics of online video popularity for technological, economic and social reasons. In this paper, based on the data collected from a leading online video service provider in China, namely Youku, the dynamics of online video popularity are analyzed in-depth from four key aspects： overall popularity distribution, individual popularity distribution, popularity evolution pattern and early-future popularity relationship. How the popularity of a set of newly upload videos distributes throughout the observation period is first studied. Then the notion popularity distributions of individual videos are carefully studied. of active days is proposed, and the per-day and per-hour Next, how the popularity of an individual video evolves over time is investigated. The evolution patterns are further defined according to the number and temporal locations of popularity bursts, in order to describe the popularity growth trend. At last, the linear relationship between early video popularity and future video popularity are examined on a log-log scale. The relationship is found to be largely impacted by the popularity evolution patterns. Therefore, the specialized models are proposed to describe the correlation according to the popularity evolution patterns. Experiment results show that specialized models can better fit the correlation than a general model. Above all, the analysis results in our work can provide direct help in practical for the interested parties of online video service such as service providers, online advisers, and network operators.

关键词： online video service online content popularity popularity evolution pattern early-future popularity relationship

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Analysis and Prediction of Content Popularity for Online Video Service:A Youku Case Study

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China Communications 2016年第12期13卷 216-233页

作者： chenyu li Jun liu Shuxin Ouyang Beijing Key Laboratory of Network System Architecture and Convergence Center for Data ScienceSchool of Information and Communication EngineeringBeijing University of Posts and Telecommunications

Understanding the characteristics and predicting the popularity of the newly published online videos can provide direct implications in various contexts such as service design, advertisement planning, network management and etc. In this paper, we collect a real-world large-scale dataset from a leading online video service provider in China, namely Youku. We first analyze the dynamics of content publication and content popularity for the online video service. Then, we propose a rich set of features and exploit various effective classification methods to estimate the future popularity level of an individual video in various scenarios. We show that the future popularity level of a video can be predicted even before the video's release, and by introducing the historical popularity information the prediction performance can be improved dramatically. In addition, we investigate the importance of each feature group and each feature in the popularity prediction, and further reveal the factors that may impact the video popularity. We also discuss how the early monitoring period influences the popularity level prediction. Our work provides an insight into the popularity of the newly published online videos, and demonstrates promising practical applications for content publishers,service providers, online advisers and network operators.

关键词： online content popularity online video service popularity characterization popularity prediction

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A Malvaceae-specific miRNA targeting the newly duplicated GaZIP1L to regulate Zn^(2+)ion transporter capacity in cotton ovules

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Science China(life Sciences) 2021年第3期64卷 339-351页

作者： Xingpeng Wen Gai Huang chenyu li Yuxian Zhu Institute for Advanced Studies Wuhan UniversityWuhan 430072China State Key Laboratory of Protein and Plant Gene Research School of Life SciencesPeking UniversityBeijing 100871China

MicroRNAs(miRNAs)play critical roles in regulating gene expression in plants,yet their functions underlying cultivated diploid Gossypium arboreum cotton ovule development are largely ***,we acquired small RNA profiles from *** ovules and fibers collected at different growth stages,and identified 46 novel miRNAs that accounted for 23.7%of all miRNAs in *** reported in the latest plant sRNA *** analysis of 84(including 38 conserved)differentially expressed *** miRNAs,we detected 215 putative protein-coding genes in 26 biological processes as their potential targets.A Malvaceae-specific novel miRNA named gar-miRN44 was found to likely regulate cotton ovule growth by targeting to a newly duplicated Zn^(2+)ion transporter gene *** cotton ovule development,gar-miRN44 transcript level decreased sharply after 10 to 15 days post-anthesis(DPA),while that of the GaZIP1L increased significantly,with a concomitant increase of Zn^(2+)ion concentration in late ovule developmental *** dynamics simulation and ion absorption analysis showed that GaZIP1L has stronger Zn2+ion binding ability than the original GaZIP1,indicating that the newly evolved GaZIP1L may be more suitable for maintaining high Zn2+ion transport capacity that is likely required for cotton ovule growth via enhanced cellulose synthase *** systematic miRNA profiling in *** and characterization of gar-miRN44 not only contribute to the understanding of miRNA function in cotton,but also provide potential targets for plant breeding.

关键词： gar-miRN44 Malvaceae GaZIP1L Zn^(2+)ion transport cotton ovule development

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Fabrication of Regular Hierarchical Structures with Superhydrophobic and High Adhesion Performances on a 304 Stainless Steel Surface via Picosecond Laser

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Journal of Bionic Engineering 2019年第5期16卷 806-813页

作者： Chenbin Ma Min Kang Xingsheng Wang Ninghui li Wei Hong chenyu li An Yang College of Engineering Nanjing Agricultural UniversityNanjing 210031China

Hierarchical structures significantly influence the development of metal surface *** this study,three kinds of hierarchical structures fbimed by the superimposition of different nanoscale(quasi-)periodic structures on micro-column arrays were fabricated on 304 stainless steel surfaces via picosecond laser *** Electron Microscope(SEM)and Confocal Laser Scanning Microscope(CLSM)were used to characterize the created hierarchical *** optical contact angle meter was used to analyse the wetting *** results show that the surfaces of these fabricated samples have superhydrophobic properties and strong adhesion per formances,which can be attributed to the formation of hierarchical structure that causes a reduction in the liquid-solid contact area and the change in the direction of surfece *** controlling the dimensionof the nanotextures on the micro-column arrays,the hydrophobic property of 304 stainless steel surfaces can be greatly improved.

关键词： superhydrophobic hierarchical structure laser irradiation bioinspiration texture adhesion stainless steel

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Fine-grained analysis of cellular smartphone usage characteristics based on massive network traffic

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The Journal of China Universities of Posts and Telecommunications 2016年第3期23卷 70-75页

作者： Gui Xiaolin liu Jun li chenyu Lv Qiujian Lei Zhenming Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications Beijing 100876 China

Increased adoption of smartphones leads to the explosive growth of mobile network traffic. Understanding the traffic characteristics of mobile network is important for Intemet service providers （ISPs） to optimize network resources. In this paper, we conduct a detailed measurement study on the hyper text transfer protocol （HTTP） traffic characteristics of cellular network among different operating systems （OSs） as well as different device-types. Firstly, we propose a probability-based method to identify the installed OS of eacb smartphone. Then we analyze the traffic characteristics of these smartphones in terms of OS and device-type based on a dataset across 31 days （a billing cycle）. Finally, we identify the installed apps of each smartphone and compare the usage of apps on the dimensions of OS and device-type. Our measurement study provides insights for network operators to strategize priciag and resource allocation for their cellular data networks.

关键词： HTTP traffic smartphone OS device-type network measurement

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Analysis of Malware Application Based on Massive Network Traffic

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China Communications 2016年第8期13卷 209-221页

作者： Xiaolin Gui Jun liu Mucong Chi chenyu li Zhenming Lei Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications

Security and privacy issues are magnified by velocity, volume, and variety of big data. User's privacy is an even more sensitive topic attracting most people's attention. While XcodeGhost, a malware of i OS emerging in late 2015, leads to the privacy-leakage of a large number of users, only a few studies have examined XcodeGhost based on its source code. In this paper we describe observations by monitoring the network activities for more than 2.59 million i Phone users in a provincial area across 232 days. Our analysis reveals a number of interesting points. For example, we propose a decay model for the prevalence rate of Xcode Ghost and we find that the ratio of the infected devices is more than 60%; that a lot of popular applications, such as Wechat, railway 12306, didi taxi, Youku video are also infected; and that the duration as well as the traffic volume of most Xcode Ghost-related HTTP-requests is similar with usual HTTP-request which makes it difficult to be found. Besides, we propose a heuristic model based on fingerprint and its web-knowledge to identify the infected applications. The identifying result shows the efficiency of this model.

关键词： Xcode Ghost big data network security applications identification

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Spatio-temporal variations of shallow seismic velocity changes in Salton Sea Geothermal Field,California in response to large regional earthquakes and long-term geothermal activities

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Earthquake Research Advances 2023年第2期3卷 15-23页

作者： Chengyuan Zhang Zhigang Peng Xiaoyan liu chenyu li State Key Laboratory of Geomechanics and Geotechnical Engineering Institute of Rock and Soil MechanicsChinese Academy of SciencesWuhanChina School of Earth and Atmospheric Sciences Georgia Institute of TechnologyAtlantaGAUnited States School of Civil Engineering Wuhan UniversityWuhanChina Earth Observatory of Singapore Nanyang Technological UniversitySingapore

We measure spatio-temporal variations of seismic velocity changes in Salton Sea Geothermal Field,California based on cross correlations of daily seismic traces recorded by a borehole seismic network from December 2007 to January *** find clear co-seismic velocity reductions during the 2010 M 7.2 El Mayor–Cucapah,Mexico earthquake at~100 km further south,followed by long-term *** co-seismic reductions are larger with longer post-seismic recoveries in higher frequency bands,indicating that material damage and healing process mostly occurred in the shallow *** addition,the co-seismic velocity reductions are larger for ray paths outside the active fluid injection/extraction *** ray paths inside injection/extraction regions are associated with smaller co-seismic reductions,but subtle long-term velocity *** also build 3D transient water flow models based on monthly injection/extraction rates,and find correlations between several water flow parameters and co-seismic velocity *** interpret the relative lack of co-seismic velocity changes within the geothermal region as unclogging of fracture network due to persistent fluid flows of geothermal *** long-term velocity increase is likely associated with the ground water depletion and subsidence due to net production.

关键词： Seismic velocity changes Salton Sea Geothermal Field Ambient noises Induced earthquakes Qinghai-Tibetan Plateau

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Free-standing hybrid films comprising of ultra-dispersed titania nanocrystals and hierarchical conductive network for excellent high rate performance of lithium storage

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Nano Research 2021年第7期14卷 2301-2308页

作者： Kunlei Zhu chenyu li Yushuang Jiao Jiawen Zhu Hongtao Ren Yufeng Luo Shoushan Fan Kai liu College of Chemistry and Chemical Engineering Qufu Normal UniversityJingxuan West Road NO.57Qufu 273165China State Key Laboratory of New Ceramics and Fine Processing and Key Laboratory of Advanced Materials of Ministry of EducationSchool of Materials Science and EngineeringTsinghua UniversityBeijing 100084China School of Materials Science and Engineering Liaocheng UniversityHunan Road No.1Liaocheng 252000China Department of Physics and Tsinghua-Foxconn Nanotechnology Research Center Tsinghua UniversityBeijing 100084China

The construction of advanced electrode materials is key to the field of energy ***,a free-standing anatase titania(TiO_(2))nanocrystal/carbon nanotube(CNT)film is reported using a simple and scalable sol-gel method,followed by *** unique free-standing film comprises ultra-small TiO_(2) nanocrystals(~5.9 nm)and super-aligned CNTs,with ultra-dispersed TiO_(2) nanocrystals on the surfaces of the *** the one hand,these TiO_(2) nanocrystals can significantly decrease the diffusion distance of the charges and on the other hand,the cross-linked CNTs can act as a three-dimensional(3D)conductive network,allowing the fast transport of *** addition,the film is free-standing,without requiring electrode fabrication and additional conductive agents and *** to these above synergistic effects,the film is directly used as an anode in li-ion batteries,and delivers a high discharge capacity of~105 mAh·g^(−1) at high rate of 60 C(1 C=170 mA·g^(−1))and excellent cycling performance over 2,500 cycles at 30 *** results indicate that the free-standing anatase TiO_(2) nanocrystal/CNT film affords a superior performance among the various TiO_(2) materials and can be a promising anode material for fast-charging li-ion ***,the TiO_(2)/CNT film exhibits an areal capacity of up to 2.4 mAh·cm^(−2),confirming the possibility of its practical use.

关键词： carbon nanotubes free-standing high rate li-ion batteries TiO_(2) ultra-small

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Knockdown of RCN1 contributes to the apoptosis of colorectal cancer via regulating IP3R1

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BIOCELL 2024年第5期48卷 835-845页

作者： XUAN SHI YUFEN WANG chenyu li WANGSHU FU XINYUE ZHANG AIXIA GONG Department of Gastroenterology The First Affiliated Hospital of Dalian Medical UniversityDalianChina Department of Gastroenterology The First Affiliated Hospital of Jinzhou Medical UniversityJinzhouChina The First Clinical College Dalian Medical UniversityDalianChina

Background:The incidence of colorectal cancer(CRC)has been increasing in recent ***,the discovery of factors that can assist in alleviating CRC is urgently ***:To identify a potential factor involved in the development of CRC,we screened the upregulated genes in tumor tissues through four datasets from an online *** expression of reticulocalbin 1(RCN1),a Ca2+-binding protein,was upregulated in the four *** on loss-offunction experiments,the effect of RCN1 on cell viability was assessed by Cell Counting Kit-8(CCK-8)*** regulatory effect of RCN1 on apoptosis was evaluated through Annexin V-fluorescein 5-isothiocyanate(FITC)/propidium iodide(PI)staining assay and terminal deoxynucleotidyl transferase-mediated dUTP nick-end labeling(TUNEL)assay in RKO and SW480 *** of endoplasmic reticulum(ER)stress signaling pathways was confirmed by estimating the phosphorylation and expression of PRKR-like ER kinase(PERK),inositol-requiring kinase-1(IRE1),transcription factor 6(ACT6),and CCAAT/enhancer-binding protein-homologous protein(CHOP).The intracellular Ca2+homeostasis regulated by RCN1 was determined through the detection of Ca2+concentration and mitochondrial membrane potential(MMP)***,whether inositol 1,4,5-trisphosphate receptor type 1(IP3R1)was involved in the regulation of RCN1 in CRC was verified through the depletion of IP3R1 in RKO ***:Knockdown of RCN1 reduced cell viability and facilitated apoptosis in RKO and SW480 *** of PERK and IRE1,activation of ATF6,and upregulation of CHOP were induced by the absence of RCN1,suggesting that the unfolded protein response(UPR)was activated in CRC *** concentration of Ca2+in mitochondria was increased after RCN1 depletion,followed by reduction in the MMP and release of cytochrome c from mitochondria to the cytoplasm in RKO and SW480 ***,it was demonstrated that IP3R1 mediates the effect of RCN1 on apoptosis i

关键词： Reticulocalbin 1 Unfolded protein response IP3R1 Colorectal cancer

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Switching the emission of di(4-ethoxyphenyl)dibenzofulvene among multiple colors in the solid state

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Science China Chemistry 2013年第9期56卷 1173-1177页

作者： li chenyu LUO Xiaoliang ZHAO WeiJun HUANG Zhe liU ZhengPing TONG Bin DONG YongQiang Beijing Key Laboratory of Energy Conversion and Storage Materials College of ChemistryBeijing Normal University College of Materials Science and Engineering Beijing Institute of Technology

Luminescent materials exhibiting emission switching in the solid state have drawn much attention though there is still no clear design strategy for such materials. In this letter, we reported the crystallization induced emission enhancement (CIEE) of di(4-ethoxyphenyl)dibenzofulvene (1), and achieved switching its emission among four different colors through modulation of its molecular packing patterns. We have investigated its potential application as optical recording materials. The twisted conformations of CIEE compounds afford morphology dependent emission and facilitate tuning their emission through modulation of molecular packing patterns. Thus we provide a possible design strategy for solid stimulus responsive luminescent materials.

关键词： fulvene crystallization induced emission enhancement stimulus responsive luminescent materials packing pattern

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