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Generating timeline summaries with social media attention

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Frontiers of Computer Science 2016年第4期10卷 702-716页

作者： Wayne Xin ZHAO ji-Rong wen Xiaoming LI School of Information Renmin University of China Beijing 100872 China Beijing Key Laboratory of Big Data Management and Analysis Methods Renmin University of China Beijing 100872 China School of Electronics Engineering and Computer Science Peking University Beijing 100871 China Beijing Key Laboratory on Integration and Analysis of Large-scale Stream Data Beijing 100144 China

Timeline generation is an important research task which can help users to have a quick understanding of the overall evolution of one given topic. Previous methods simply split the time span into fixed, equal time intervals without studying the role of the evolutionary patterns of the underlying topic in timeline generation. In addition, few of these methods take users＇ collective interests into considerations to generate timelines. We consider utilizing social media attention to address these two problems due to the facts： 1） social media is an important pool of real users＇ collective interests; 2） the information cascades generated in it might be good indicators for boundaries of topic phases. Employing Twitter as a basis, we propose to incorporate topic phases and user＇s collective interests which are learnt from social media into a unified timeline generation algorithm. We construct both one informativeness-oriented and three interestingness-oriented evaluation sets over five topics. We demonstrate that it is very effective to generate both informative and interesting timelines. In addition, our idea naturally leads to a novel presen- tation of timelines, i.e., phase based timelines, which can potentially improve user experience.

关键词： timeline social media attention phase users'collective interests

Synthesis of Polybutadienes with Controllable Microstructure by a Novel Binary Nd(3-NBSO_3)_3/Alkylaluminum Catalyst System

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Chinese Journal of Polymer Science 2015年第3期33卷 475-480页

作者： ji-qin wen Xue-quan Zhang 代全权 Key Laboratory of Synthetic Rubber Changchun Institute of Applied ChemistryChinese Academy of Sciences jiangsu Province Institute for Medical Equipment Testing

The polymerization of 1,3-butadiene was examined by using a novel halogen-free neodymium m-nitrobenzenesulfonate （Nd（3-NBSOa）3·donors）/alkylaluminum binary catalyst system. The catalyst showed fairly high activity and controllable selectivity. The microstructure of the resultant polymer was adjustable by variation of electron donor and/or the alkylaluminum. ^13C-NMR and thermal analysis demonstrate that the produced polybutadienes have stereo-block chain structures of cis-1,4 and trans-1,4 segments with adjustable Tm and To. The neodymium sulfonate-based catalyst is believed to be significant in regulating the chain structure of polydienes and in exploring 1,3-diene polymerization mechanism.

关键词： Polybutadiene Microstructure Ziegler-Natta polymerization.

Editorial for Special Issue on Large-scale Pre-training:Data,Models,and Fine-tuning

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Machine Intelligence Research 2023年第2期20卷 145-146页

作者： ji-Rong wen ji-Rong wen Zi Huang Hanwang Zhang Renmin University of China China Zi Huang The University of QueenslandAustralia Hanwang Zhang Nanyang Technological UniversitySingapore Renmin University of China China The University of Queensland Australia Nanyang Technological University Singapore

In recent years,there has been a surge of interest and rapid development in large-scale pre-training due to the explosive growth of both data and model ***-scale training has achieved impressive performance milestones across a wide range of practical problems,including natural language processing,computer vision,recommendation systems,robotics,and other basic research areas like bioinformatics.

关键词： computer scale parameters

Index-free triangle-based graph local clustering

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Frontiers of Computer Science 2024年第3期18卷 143-153页

作者： Zhe YUAN Zhewei WEI Fangrui LV ji-Rong wen The Country and Area Studies Academy Beijing Foreign Studies UniversityBeijing 100089China Gaoling School of Artificial Intelligence Renmin University of ChinaBeijing 100872China

Motif-based graph local clustering(MGLC)is a popular method for graph mining tasks due to its various ***,the traditional two-phase approach of precomputing motif weights before performing local clustering loses locality and is impractical for large *** some attempts have been made to address the efficiency bottleneck,there is still no applicable algorithm for large scale graphs with billions of *** this paper,we propose a purely local and index-free method called Index-free Triangle-based Graph Local Clustering(TGLC^(*))to solve the MGLC problem w.r.t.a ***^(*)directly estimates the Personalized PageRank(PPR)vector using random walks with the desired triangleweighted distribution and proposes the clustering result using a standard sweep *** demonstrate TGLC^(*)’s scalability through theoretical analysis and its practical benefits through a novel visualization ***^(*)is the first algorithm to solve the MGLC problem without precomputing the motif *** experiments on seven real-world large-scale datasets show that TGLC^(*)is applicable and scalable for large graphs.

关键词： graph local clustering triangle motif index-free sampling method visualization

Adaptive joint configuration optimization for collaborative inference in edge-cloud systems

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Science China(Information Sciences) 2024年第4期67卷 335-336页

作者： Zheming YANG wen ji Zhi WANG Institute of Computing Technology Chinese Academy of Sciences University of Chinese Academy of Sciences Peng Cheng Laboratory Tsinghua Shenzhen International Graduate School Tsinghua University

With the rapid development of technologies such as deep learning and the Internet of Things(IoT), the deployment and application of various IoT devices are becoming increasingly widespread, resulting in the inference tasks generated increasing dramatically [1]. Many deep neural network(DNN) models are deployed on servers for performing inference tasks.

关键词： Inference engines

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Index-adaptive Triangle-Based Graph Local Clustering

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Computers, Materials & Continua 2023年第6期75卷 5009-5026页

作者： Yuan Zhe Wei Zhewei wen ji-rong Renmin University of China Beijing100872China

Motif-based graph local clustering(MGLC)algorithms are gen-erally designed with the two-phase framework,which gets the motif weight for each edge beforehand and then conducts the local clustering algorithm on the weighted graph to output the *** correctness,this frame-work brings limitations on both practical and theoretical aspects and is less applicable in real interactive *** research develops a purely local and index-adaptive method,Index-adaptive Triangle-based Graph Local Clustering(TGLC+),to solve the MGLC problem ***+combines the approximated Monte-Carlo method Triangle-based Random Walk(TRW)and deterministic Brute-Force method Triangle-based Forward Push(TFP)adaptively to estimate the Personalized PageRank(PPR)vector without calculating the exact triangle-weighted transition probability and then outputs the clustering result by conducting the standard sweep *** paper presents the efficiency of TGLC+through theoretical analysis and demonstrates its effectiveness through extensive *** our knowl-edge,TGLC+is the first to solve the MGLC problem without computing the motif weight beforehand,thus achieving better efficiency with comparable ***+is suitable for large-scale and interactive graph analysis tasks,including visualization,system optimization,and decision-making.

关键词： Graph local clustering triangle motif sampling method

Shot Noise in Aharonov-Casher Rings

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Chinese Physics Letters 2010年第6期27卷 199-202页

作者： LIN Liang-Zhong ZHU Rui DENG wen-ji Department of Physics South China University of Technology Guangzhou 510640

We investigate the shot noise of electron transport through an Aharonov-Casher ring subject to the Rashba spin-orbit coupling （SOC）. Analytic expressions for the coefficients of reflection and transmission are derived by using the Griffith boundary conditions. For this kind of SOC, the ballistic transport of electrons can be analyzed as two independent spin channels, and both of them have the same transmission and reflection coefficients. The dependences of shot noise and Landauer-Biittiker conductance on controllable factors, including the strength of Rashba SOC, the asymmetrical angle of lead-connection positions, the radius of the rings, and the wave vector （or energy） of the incident Fermi electrons, are explicitly described by some new combined parameters. The ways that the shot noise and conductance vary with Rashba SOC and with asymmetrical angle are demonstrated by numerical simulations, respectively. It is revealed that the shot noise reaches its maximum for the particular situation of half transmission and half reflection and zero shot noise occurs at conductance maxima.

关键词： ELECTRONIC noise ELECTRON transport BOUNDARY value problems ELECTRIC conductivity REFLECTANCE NUMERICAL analysis SIMULATION methods & models

Study on alkali mechanical activation for recovering rare earth from waste fluorescent lamps

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Journal of Rare Earths 2018年第1期36卷 108-112页

作者： Ling He wen ji Yanwei Yin Weimin Sun State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals Lanzhou University of Technology School of Materials Science and Engineering Lanzhou University of Technology

Recycling of rare earth from waste fluorescent lamps is becoming increasingly important in future sustainable development. However, cerium and terbium are usually difficult to recover due to the stable spinel structure. In the research, alkali mechanical activation was innovatively used to pretreat the waste phosphors for recovering rare earths. The effect of alkali mechanical activation on the structural changes of waste phosphors was explored using X-ray diffraction （XRD） and Fourier transform infrared spec- troscopy （FFIR）. Meanwhile, the effects of different parameters including milling speed, activation time, and amount of alkali on the leaching rates of rare earth were investigated. The rare earth elements re- covery rates are observed to increase rapidly, particularly with increases in rotational speed and acti- vation time. Under optimal conditions, the maximum leaching rates of Ce and Tb reach 85.0% and 89.8%, respectively. And the total recovery rates of rare earth reach 95.2%. All the results indicate that alkali mechanical activation can effectively destroy the spinel structure and produce substantial physico- chemical changes. These changes lead to the easy dissolution of rare earths in acid solution, and greatly improve the leaching of cerium and terbium.

关键词： Rare earthSpinel structureRecovery rateAlkali mechanical activationWaste phosphorsRare earths

Effects of the Wetting Particles on Phase Separation of Binary Mixtures

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Chinese Physics Letters 2000年第11期17卷 824-826页

作者： LIU ji-wen MA Yu-Qiang National Laboratory of Solid State Microstructures Nanjing UniversityNanjing 210093

We study phase separation of binary mixtures in the presence of mobile particles by the lattice Monte Carlo *** presence of mobile particles changes the morphology of the domain growth,in agreement with earlier experimental *** varying the wetting interaction strength,we can control the speed of phase separation,and find a critical wetting strength beyond which the growth of the domains slows *** propose a novel scaling function which describes the growth of the domain size L(t)as a function of *** suggests an applicable way to tune the speed of phase separation by the coupling between the phase decomposition and the mobile particle-wetting process.

关键词： strength separation phase