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Location and Trajectory Identification from Microblogs

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Journal of Computer Science & Technology 2019年第4期34卷 727-746页

作者： Na Ta guo-liang li Jun Hu Jian-Hua Feng School of Journalism and Communication Renmin University of ChinaBeijing 100872China Department of Computer Science and Technology Tsinghua UniversityBeijing 100084China Airbnb Network(Beijing)Inc. Beijing 100020China

The rapid development of social networks has resulted in a proliferation of user-generated content(UGC),which can benefit many *** this paper,we study the problem of identifying a user's locations from microblogs,to facilitate effective location-based advertisement and *** the location information in a microblog is incomplete,we cannot get an accurate location from a local *** such,we propose a global location identification method,*** combines multiple microblogs of a user and utilizes them to identify the user's *** not only improves the quality of identifying a user's location but also supplements the location of a microblog so as to obtain an accurate location of a *** facilitate location identification,Glitter organizes points of interest(POIs)into a tree structure where leaf nodes are POIs and non-leaf nodes are segments of POIs,e.g.,countries,cities,and *** the tree structure,Glitter first extracts candidate locations from each microblog of a user which correspond to some tree *** Glitter aggregates these candidate locations and identifies top-κlocations of the *** the identified top-κuser locations,Glitter refines the candidate locations and computes top-κlocations of each *** achieve high recall,we enable fuzzy matching between locations and *** propose an incremental algorithm to support dynamic updates of *** also study how to identify users'trajectories based on the extracted *** propose an effective algorithm to extract high-quality *** results on real-world datasets show that our method achieves high quality and good performance,and scales well.

关键词： location identification microblog trajectory identification

Microstructure and mechanical performances of CGHAZ for oil tank steel during high heat input welding

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Rare Metals 2013年第2期32卷 129-133页

作者： guo-li liang Shan-Wu Yang Hui-Bin Wu Xue-li liu Department of Material Physics and Chemistry University of Science Technology of BeijingBeijing 100083China National Engineering Research Center for Advanced Rolling Technology University of Science Technology of Beijing Department of Electro-Mechanical Engineering Tangshan College

Microstructure and mechanical performances of the coarse grain heat-affected-zone （CGHAZ） for oil tank steel with different Ti content were investigated through Gleeble-3500, scanning electron microscopy, transmission electron microscopy, and energy dispersive spectrometer. The results show that the strength and low- temperature toughness of base material are significantly improved for the high titanium content steel, but the impact toughness of CGHAZ is seriously deteriorated after the high heat input welding and declined sharply with the heat input increasing, while the effects of heat input on impact toughness are very weak for the low titanium content steel, impact toughness of which is gradually larger than that of high titanium content steel with the welding heat input increasing because of the granular bainite increasing, TiN particle coarsening, and （Ti, Nb） N composition evolution during the high input welding for high titanium content steel.

关键词： Ti-steel CGHAZ Impact toughness TiN particle

Pd cluster decorated free standing flexible cathode for high performance li-oxygen batteries

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Nano Research 2024年第4期17卷 2678-2686页

作者： liang guo guoliang Zhang Ruonan Yang Dongmei Zhang Xiuqi Zhang Han Yu Xia li Feng Dang Key Laboratory for liquid-Solid Structure Evolution and Processing of Materials Ministry of EducationShandong UniversityJinan 250061China

As a promising candidate for the next generation energy storage system,rechargeable lithium-oxygen batteries(LOBs)still face substantial challenges caused by insulating discharge products that preclude their practical *** highly efficient cathode catalysts capable of facilitating formation/decomposition of discharge products is considered as an essential approach towards high performance ***,Pd decorated Te nanowires(Pd@Te NWs)were synthesized as advanced catalyst in LOBs to maximize Pd utilization and achieve synergistic effect,in which Pd clusters were uniformly grown on Te substrate though regulating the Pd:Te ***,Pd@Te nanowires assembled into an interpenetrating network-like structure by vacuum filtration and employed as flexible cathode,enabling LOBs achieved an ultralong 190 cycles stability and a superior specific capacity of 3.35 mAh·cm^(-2).Experimental studies and density functional theory(DFT)calculations reveal the excellent catalytic ability of Pd@Te and synergistic catalytic mechanism of Pd and Te,in which uniform electron distribution,extensive electron exchange,and large adsorption distance between Pd cluster and discharge products promote homogeneous adsorption/desorption of discharge products,while the high adsorption energy of Te substrate for li species reduces the initial dynamical energy barrier during discharging *** current work provides viable strategy to design composite catalysts for flexible cathode of LOBs with synergistic catalytic effects.

关键词： flexible lithium-oxygen batteries Pd@Te synergistic catalysis cathode catalysts density functional theory(DFT)calculation

Feature Selection for the Prediction of Translation Initiation Sites

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Genomics, Proteomics & Bioinformatics 2005年第2期3卷 73-83页

作者： guo-liang li Tze-Yun Leong Medical Computing Laboratory School of Computing National University of Singapore Singapore 117543.

Translation initiation sites (TISs) are important signals in cDNA sequences. In many previous attempts to predict TISs in cDNA sequences, three major factors affect the prediction performance: the nature of the cDNA sequence sets, the rel- evant features selected, and the classification methods used. In this paper, we examine different approaches to select and integrate relevant features for TIS pre- diction. The top selected significant features include the features from the position weight matrix and the propensity matrix, the number of nucleotide C in the se- quence downstream ATG, the number of downstream stop codons, the number of upstream ATGs, and the number of some amino acids, such as amino acids A and D. With the numerical data generated from these features, different classifi- cation methods, including decision tree, naive Bayes, and support vector machine, were applied to three independent sequence sets. The identified significant features were found to be biologically meaningful, while the experiments showed promising results.

关键词： translation initiation site prediction classification feature selection

The point spread function reconstruction by using Moffatlets–I

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Research in Astronomy and Astrophysics 2016年第9期16卷 51-64页

作者： Bai-Shun li guo-liang li Jun Cheng John Peterson Wei Cui Purple Mountain Observatory Chinese Academy of Sciences Nanjing 210008 China University of Chinese Academy of Sciences Beijing 100049 China Department of Physics Purdue University 525 Northwestern Ave West Lafayette Indiana 47907 USA

Shear measurement is a crucial task in current and future weak lensing survey projects. The reconstruction of the point spread function （PSF） is one of the essential steps involved in this process. In this work, we present three different methods, Gaussianlets, Moffatlets and Expectation Maximization Principal Component Analysis （EMPCA）, and quantify their efficiency on PSF reconstruction using four sets of simulated Large Synoptic Survey Telescope （LSST） star images. Gaussianlets and Moffatlets are two different sets of basis functions whose profiles are based on Gaussian and Moffat functions respectively. EMPCA is a statistical method performing an iterative procedure to find the principal components （PCs） of an ensemble of star images. Our tests show that：（1） Moffatlets always perform better than Gaussianlets. （2） EMPCA is more compact and flexible, but the noise existing in the PCs will contaminate the size and ellipticity of PSF. By contrast, Moffatlets keep the size and ellipticity very well.

关键词： cosmology observations -- stars imaging -- techniques image processing

Interaction Between Elements Nb and Mo During Precipitation in Microalloyed Austenite

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Journal of Iron and Steel Research International 2010年第9期17卷 60-63页

作者： YUAN Shao-qiang liang guo li ZHANG Xiao-juan Department of Eleetromeehanieal Engineering Tangshan College Tangshan 063000 Hebei China

Thermo-simulation test and transmission electron microscopy （TEM） have been used to investigate the interaction between the microalloying elements Nb and Mo within the precipitates during relaxation after austenite deformation of C-Ti-Mo steel and C-Nb-Mo steel. The experimental results demonstrated that the austenitic structure was preserved both in C-Ti-Mo steel and C-Nb-Mo steel even if they were relaxed for 1000 s after deformation at 850℃. The strainqnduced precipitate occurs in two kinds of steel. Through the energy spectrum analysis, it was found that the precipitates were Ti（C, N） and Mo-bearing Nb（C, N） respectively and there exists a strong affinity of Mo for Nb with in the precipitates. Mo atoms would enter the lattice of Nb（C, N） particles probably after Nb（C, N） formation.

关键词： thermo-simulation microstructure strain-induced precipitation relaxation carbonitride

Study the ethanol SI/HCCI combustion mode transition by using the fast thermal management system

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Chinese Science Bulletin 2007年第19期52卷 2731-2736页

作者： PENG YaPing TAN ManZhi guo liang liU FaFa li Hua guo YingNan Department of Internal Combustion Engine Campus Nanling Jilin University Changchun 130022 China

In this paper the ethanol homogeneous charge compression ignition (HCCI) is achieved in a modified single cylinder engine by means of a self-developed fast thermal management system (FTMS), and the ethanol SI/HCCI operation regions are defined. It can be concluded that the thermal efficiency is higher and the NOx emission is lower in the HCCI operation region. In addition, the maximum NOx emission drops by 98%. The ethanol SI/HCCI combustion mode transition is conducted in different conditions near the SI/HCCI operation boundaries. It is likely to realize the transition by the utilization of FTMS. However, it is impossible to complete the transition within one operating cycle under current operation conditions. There are fluctuations in engine speed and brake mean effective pressure during the transition process. In order to reduce the fluctuations during the transition, the initial work concerning the effects of the spark ignition on the transition smoothness is carried out and the investigation indicates that the engine speed and brake mean effective pressure fluctuations cannot be eradicated only through spark ignition. Therefore, the control strategies combined with other factors should be further optimized.

关键词：电荷压缩点火乙醇燃烧模型火花

Synthesis of Polyurethane/Poly(urea-formaldehyde) Double-shelled Microcapsules for Self-healing Anticorrosion Coatings

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Chinese Journal of Polymer Science 2020年第1期38卷 45-52,I0006页

作者： Yan Song Kai-Feng Chen Jing-Jing Wang Yuan liu Tao Qi guo liang li National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology Key Laboratory of Green Process and EngineeringInstitute of Process EngineeringChinese Academy of SciencesBeijing WO 190China Xiamen Advanced Materials Academy of Luoyang Ship Material Research Institute Xiamen 361101China Science and Technology on Marine Corrosion and Protection Laboratory Qingdao 266101China

One-component, catalyst-free self-healing coatings with double-shelled polymer microcapsules have drawn considerable attention due to wide applications. In this work, the synthesis parameters of double-shelled polymer microcapsules and the mechanism of the self-healing process were systematically investigated. Apart from the chemical structure of the microcapsule shell, the shell thickness, the microcapsule size,and the core fraction could affect the self-healing anticorrosion properties. The synthesis parameters were further optimized in terms of the agitation rate, p H, weight ratio of core to shell, and temperature. Under these conditions, the microcapsule shell consisting of a rough surface formed by poly(urea-formaldehyde) and a smooth inner wall by polyurethane was prepared. The size of the microcapsules and core fraction were calculated to be approximately 30 μm and 75%, respectively. The self-healing anticorrosion coating incorporating as-synthesized microcapsules exhibited corrosion resistance in artificially scratched areas, which was further characterized by electrochemical impedance spectroscopy.

关键词： Double-shelled Microcapsules Anticorrosion Self-healing

Clinical study on the surgical treatment of atypical lisfranc joint complex injury

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World Journal of Clinical Cases 2020年第19期8卷 4388-4399页

作者： Xu li Le-Sheng Jia Ang li Xin Xie Jun Cui guo-liang li Department of Foot and Ankle Surgery Central Hospital Affiliated to Shenyang Medical CollegeShenyang 110024Liaoning ProvinceChina Department of Functional Experiment Center Liaoning University of Traditional Chinese MedicineShenyang 110847Liaoning ProvinceChina

BACKGROUND lisfranc injuries have not received much attention by orthopedic doctors in the past,and there is little related research on the diagnosis and treatment of these *** recent years with the rise in foot and ankle surgery,doctors are now paying more attention to this type of ***,there is still a high rate of missed diagnosis due to insufficient attention causing treatment delays or inadequate treatments,which eventually result in greater sequelae;including long-term pain,arthritis,foot deformity *** particular,for cases with a mild lisfranc joint complex injury,the incidence of sequelae is *** To select an active surgical treatment for an atypical lisfranc joint complex injury and to evaluate the clinical efficacy of the surgical *** The clinical data of 18 patients,including 10 males and 8 females aged 20-64 years with lisfranc injuries treated in our department from January 2017 to September 2019 were retrospectively *** patients were treated with an open reduction and internal fixation method using locking titanium mini-plates and hollow screws or Kirschner wires.X-ray images were taken and follow-up was performed monthly after the operation;the internal fixation was then removed 4-5 mo after the operation;and the American Orthopedic Foot and Ankle Society(AOFAS)score was used for evaluation on the last *** All patients were followed up for 6-12 mo.A good/excellent AOFAS score was observed in 88.9%of *** For atypical lisfranc joint complex injuries,active open reduction and internal fixation can be performed to enable patients to obtain a good prognosis and satisfactory functional recovery.

关键词： lisfranc joint complex injury Avulsion fracture Open reduction and internal fixation Atypical lisfranc injury Stress test Computed tomography