检索结果-南通市图书馆

Analyzing the dynamics of online video popularity

在线全文

学校读者我要写书评

暂无评论

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

Wind speed equalization-based incoming wind classification by aggregating DFIGs

在线全文

学校读者我要写书评

暂无评论

Journal of Modern Power Systems and Clean Energy 2013年第1期1卷 42-48页

作者： Zhaojun MENG Feng XUE xueming li Group Corporation(State Grid Electric Power Research Institute) Nanjing 210003JiangsuChina

With the development of wind energy,it is necessary to develop equivalent models to represent dynamic behaviors of wind farms in power *** equivalent wind method is investigated for the aggregation of doubly-fed induction generator wind *** detailed procedures for the calculation of equivalent wind are *** necessity of classifying incoming winds is *** improve the performances of the method,incoming winds are classified according to mean wind speeds and positive/negative semi-variances of wind speeds,and a group of turbines with similar incoming winds are aggregated *** effectiveness of the method is verified through simulations in MATLAB/Simulink.

关键词： DFIG Power curve Equivalent wind Aggregated wind turbine

Fuzzy-based indoor scene modeling with differentiated examples

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Computational Visual Media 2023年第4期9卷 717-732页

作者： Qiang Fu Shuhan He Hongbo Fu xueming li Zhigang Deng School of Digital Media and Design Arts Beijing University of Posts and TelecommunicationsBeijingChina School of Creative Media City University of Hong KongHong KongChina Department of Computer Science University of HoustonTXUSA

Well-designed indoor scenes incorporate interior design knowledge,which has been an essential prior for most indoor scene modeling ***,the layout qualities of indoor scene datasets are often uneven,and most existing data-driven methods do not differentiate indoor scene examples in terms of *** this work,we aim to explore an approach that leverages datasets with differentiated indoor scene examples for indoor scene *** solution conducts subjective evaluations on lightweight datasets having various room configurations and furniture layouts,via pairwise comparisons based on fuzzy set *** also develop a system to use such examples to guide indoor scene modeling using user-specified ***,we focus on object groups associated with certain human activities,and define room features to encode the relations between the position and direction of an object group and the room *** perform indoor scene modeling,given an empty room,our system first assesses it in terms of the user-specified object groups,and then places associated objects in the room guided by the assessment results.A series of experimental results and comparisons to state-of-the-art indoor scene synthesis methods are presented to validate the usefulness and effectiveness of our approach.

关键词： indoor scene modeling modeling by example fuzzy sets

Current status of gene therapy in melanoma treatment

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

BIOCELL 2020年第2期44卷 167-174页

作者： YONGLU WANG WEI YOU xueming li College of Pharmacy Nanjing Tech UniversityNanjingChina College of Pharmacy and Nutrition University of SaskatchewanSaskatoonCanada Nanjing Bestform Pharmaceutical Technology Co. Ltd.NanjingChina Postgraduate Department Nanjing Tech UniversityNanjingChina

Melanoma is the deadliest type of skin cancer and which has a high ability of *** is an effective method to treat I or II stage melanoma ***,there are few treatment options for metastatic *** therapy is one of the attractive options and is considered as the future direction for treating *** review mainly discusses the properties and challenges of the various gene therapies in melanoma,especially the delivery systems and gene targeting.

关键词： Gene therapy Melanoma Viral delivery system Nanoparticles

Urban Green Space, Uneven Development and Accessibility: A Case of Dalian′s Xigang District

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Geographical Science 2015年第5期25卷 644-656页

作者： YANG Jun li Chuang li Yuechen XI Jianhao GE Quansheng li xueming liaoning Key Laboratory of Physical Geography and Geomatics Liaoning Normal University Institute of Geographic Sciences and Natural Resources Research Chinese Academy of Sciences

This study examines the socio-spatial context of uneven development and the residential accessibility of green space in Dalian of liaoning Province, China. The social fairness was analyzed with a community scale as the basis. We combined social scientific methods with a GIS method using a behavior accessibility model from the perspectives of fairness of urban green space allocation based on social geography, geographic information science, management science and many other related discipline theories. The results show that: 1) Most of the urban green space distribution presents an unbalanced phenomenon, and it does not match with the population distribution; 2) We found some differences in the accessibility of the population with different attributes and opportunities to use and enjoy the urban green spaces, mainly due to: the dual social and spatial attributes of the residents and the serious stratum differentiation generated were the internal causes; the residential space differentiation and the pursuit of economic and real estate development were the direct causes; and unreasonable planning, in regard to the fact that government policies did not give consideration to efficiency and fairness, was also an important factor.

关键词： behavior accessibility fairness of green space behavior accessibility model Xigang District of Dalian GIS

Impact of Accessibility on Housing Prices in Dalian City of China Based on a Geographically Weighted Regression Model

在线全文

学校读者我要写书评

暂无评论

Chinese Geographical Science 2018年第3期28卷 505-515页

作者： YANG Jun BAO Yajun ZHANG Yuqing li xueming GE Quansheng Human Settlements Research Center Liaoning Normal University Key Laboratory of Land Surface Pattern and Simulation Institute of Geographic Sciences and Natural Resources Research Chinese Academy of Sciences

This paper studies the relationship between accessibility and housing prices in Dalian by using an improved geographically weighted regression model and house prices, traffic, remote sensing images, etc. Multi-source data improves the accuracy of the spatial differentiation that reflects the impact of traffic accessibility on house prices. The results are as follows: first, the average house price is 12 436 yuan(RMB)/m^2, and reveals a declining trend from coastal areas to inland areas. The exception was Guilin Street, which demonstrates a local peak of house prices that decreases from the center of the street to its periphery. Second, the accessibility value is 33 minutes on average, excluding northern and eastern fringe areas, which was over 50 minutes. Third, the significant spatial correlation coefficient between accessibility and house prices is 0.423, and the coefficient increases in the southeastern direction. The strongest impact of accessibility on house prices is in the southeastern coast, and can be seen in the Lehua, Yingke, and Hushan communities, while the weakest impact is in the northwestern fringe, and can be seen in the Yingchengzi, Xixiaomo, and Daheishi community areas.

关键词： geographically weighted regression model accessibility house price Dalian City

Spatio-temporal Differentiation of Residential Land for Coastal Town: A Case Study of Dalian Jinshitan

在线全文

学校读者我要写书评

暂无评论

Chinese Geographical Science 2016年第4期26卷 566-576页

作者： YANG Jun SUN Jing ZHAO Hongdan XI Jianchao li xueming liaoning Key Laboratory of Physical Geography and Geomatics Liaoning Normal University Key Laboratory of Land Surface Pattern and Simulation Institute of Geographic Sciences and Natural Resources Research Chinese Academy of Sciences

Based on SPOT5 satellite remote sensing images and land use data in five time phases covering the period 1988–2012, the distribution characteristics, spatial differentiation processes, and driving mechanisms affecting the residential land of the Jinshitan Tourist Resort were studied. The work included a combination of GIS technology, adoption of the differentiation index D, and the multi-group differentiation-measure model D(m). The results provided a basis for the following conclusions: 1) From 1988 to 2012, the degree of differentiation of the rural residential land first decreased, and then increased. The general residential, commercial residential and garden-house land-types all showed declining trends, of which the garden-house type presented the most intense volatility. 2) The overall background of the traditional residential land type was gradually replaced by a new residential land type, and the total area of residential land increased year by year, significantly improving the overall residential conditions. The areas of the new residential land type showed growth, and were increasingly widely distributed in the coastal tourist resorts, transportation corridors, and scenic areas. 3) Government policy, social differentiation, market mechanisms, and individual choices(along with other factors) were mutually promoted, although still restrained. However, all of these factors interacted to constrain the developmental direction and the processes affecting tourism real estate in the Dalian Jinshitan Tourist Resort.

关键词： residential space differentiation differentiation degree residential conditions driving mechanism Dalian Jinshitan

Cryo-EM structure of R-loop monoclonal antibody S9.6 in recognizing RNA:DNA hybrids

在线全文

学校读者我要写书评

暂无评论

Journal of Genetics and Genomics 2022年第7期49卷 677-680页

作者： Qin li Chao lin Zhipu Luo Haitao li xueming li Qianwen Sun Center for Plant Biology School of Life SciencesTsinghua UniversityBeijing 100084China Beijing Advanced Innovation Center for Structural Biology Tsinghua UniversityBeijing 100084China Institute of Molecular Enzymology School of Biology and Basic Medical SciencesSoochow UniversitySuzhouJiangsu 215123China University Beijing 100084China Tsinghua-Peking Center for life Sciences Beijing 100084China

Three-stranded chromatin structure R-loops are thought to be formed co-transcriptionally with newly synthesized RNA behind RNA polymerases,and play essential biological roles(Costantino and Koshland,2015;Santos-Pereir... 详细信息

关键词： monoclonal structure

g-C_(3)N_(4)-coated MnO_(2)hollow nanorod cathode for stable aqueous Zn-ion batteries

在线全文

学校读者我要写书评

暂无评论

Frontiers of Chemical Science and Engineering 2023年第2期17卷 217-225页

作者： Jiwei Xie Guijing liu Kaikai Wang xueming li Yusen Bai Shanmin Gao Leqing Fan Rundou Zheng School of Chemistry and Materials Science Ludong UniversityYantai 264025China School of Chemistry&Chemical Engineering Linyi UniversityLinyi 276000China Fujian Key Laboratory of Photoelectric Functional Materials Huaqiao UniversityXiamen 361021China

Aqueous zinc-ion batteries are attracting considerable attention because of their high safety compared with conventional lithium-ion ***-based materials have been widely developed for zinc-ion batteries cathode owning to their low cost,high security and simple ***,the severe volume expansion and poor stability during charging and discharging limit the further development of manganese-based ***,superiorα-MnO_(2)@g-C_(3)N_(4)was successfully prepared for stable zinc-ion batteries(ZIBs)cathode by introducing g-C_(3)N_(4)*** with pureα-MnO_(2),αMnO_(2)@g-C_(3)N_(4)has a specific capacity of 298 mAh·g^(-1)at 0.1 A·g^(-1).Even at 1 A·g^(-1),theα-MnO_(2)@g-C_(3)N_(4)still retains 100 mAh·g^(-1)(83.4%retention after 5000 cycles),implying its excellent cycling ***α-MnO_(2)@gC_(3)N_(4)-based cathode has the highest energy density(563 Wh·kg^(-1))and power energy density(2170 W·kg^(-1)).This work provides new avenues for the development of a wider range of cathode materials for ZIBs.

关键词： α-MnO_(2)hollow nanorods g-C_(3)N_(4) heterojunction aqueous Zn-ion batteries