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Exploiting Structural and Temporal Influence for Dynamic Social-Aware Recommendation

Journal of Computer Science & Technology 2020年第2期35卷 281-294页

作者： Yang Liu Zhi Li Wei Huang tong xu En-Hong Chen Anhui Province Key Laboratory of Big Data Analysis and Application University of Science and Technology of China Hefei 230027China

Recent years have witnessed the rapid development of online social platforms,which effectively support the business intelligence and provide services for massive *** this line,large efforts have been made on the socialaware recommendation task,i.e.,leveraging social contextual information to improve recommendation *** existing methods have treated social relations in a static way,but the dynamic influence of social contextual information on users'consumption choices has been largely *** that end,in this paper,we conduct a comprehensive study to reveal the dynamic social influence on users'preferences,and then we propose a deep model called Dynamic Social-Aware Recommender System(DSRS)to integrate the users'structural and temporal social contexts to address the dynamic socialaware recommendation *** consists of two main components,i.e.,the social influence learning(SIL)and dynamic preference learning(DPL).Specifically,in the SIL module,we arrange social graphs in a sequential order and borrow the power of graph convolution networks(GCNs)to learn social ***,we design a structural-temporal attention mechanism to discriminatively model the structural social influence and the temporal social ***,in the DPL part,users'individual preferences are learned dynamically by recurrent neural networks(RNNs).Finally,with a prediction layer,we combine the users'social context and dynamic preferences to generate *** conduct extensive experiments on two real-world datasets,and the experimental results demonstrate the superiority and effectiveness of our proposed model compared with the state-of-the-art methods.

关键词： recommender system social influence sequential recommendation

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Frontiers of Plasmonics

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Frontiers of physics 2014年第1期9卷 1-2页

作者： Lian-Ming tong Hong-Xing xu Laboratory of Nanoscale Physics and Devices Institute of Physics Chinese Academy of Sciences P.O.BOX 603-146 Beijing 100190 China

Plasmonics, an important branch of nanooptics, has seen its prosperous development and exciting applications during the past years [1 3]. Surface plasmons （SPs）, the light-driven collective oscillation of free electrons in metals, include the localized type （localized surface plasmons, LSPs） and propagating type （surface plasmon polaritons, SPPs）. The most charming characteristics of SPs are the strong confinement of electromagnetic （EM） field （and thus EM enhancement） and long range propagation of EM energy （in case of SPPs）. Based on these characters, intriguing applications in many fields have been found, for example, single molecule spectroscopy using surface- enhanced Raman scattering （SERS） [4-7], ultrasensitive detection of chemical and biological species using localized surface plasmon resonance （LSPR） sensor [8, 9], spaser that stems from the amplification of resonant SPs in the cavity of metal nanostructures [10-12], superlens that utilizes the sub-wavelength concentration of SPs [13, 14], and plasmonic circuits that are based on the propagation modulation of SPPs [15-17].

关键词： light-driven LSPs sub-wavelength

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Long-Term Sunspot Number Prediction based on EMD Analysis and AR Model

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Chinese Journal of Astronomy and Astrophysics 2008年第3期8卷 337-342页

作者： tong xu Jian Wu Zhen-Sen Wu Qiang Li School of Science Xidian University Xi＇an 710071 China National Key Laboratory of Electromagnetic Environment China Research Institute of Radio Wave Propagation Beijing 102206 China IAP University of Rostock Schlosstr. 6 Kuehlungsbom 18225 Germany

The Empirical Mode Decomposition （EMD） and Auto-Regressive model （AR） are applied to a long-term prediction of sunspot numbers. With the sample data of sunspot numbers from 1848 to 1992, the method is evaluated by examining the measured data of the solar cycle 23 with the prediction： different time scale components are obtained by the EMD method and multi-step predicted values are combined to reconstruct the sunspot number time series. The result is remarkably good in comparison to the predictions made by the solar dynamo and precursor approaches for cycle 23. Sunspot numbers of the coming solar cycle 24 are obtained with the data from 1848 to 2007, the maximum amplitude of the next solar cycle is predicted to be about 112 in 2011-2012.

关键词： Sun sunspots- Sun activity

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Study on Information Diffusion Analysis in Social Networks and Its Applications

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International Journal of Automation and computing 2018年第4期15卷 377-401页

作者： Biao Chang tong xu Qi Liu En-Hong Chen Anhui Province Key Laboratory of Big Data Analysis and Application School of Computer ScienceUniversity of Science and Technology of China

Due to the prevalence of social network services, more and more attentions are paid to explore how information diffuses and users affect each other in these networks, which has a wide range of applications, such as viral marketing, reposting prediction and social recommendation. Therefore, in this paper, we review the recent advances on information diffusion analysis in social networks and its applications. Specifically, we first shed light on several popular models to describe the information diffusion process in social networks, which enables three practical applications, i.e., influence evaluation, influence maximization and information source detection. Then, we discuss how to evaluate the authority and influence based on network structures. After that, current solutions to influence maximiza- tion and information source detection are discussed in detail, respectively. Finally, some possible research directions of information diffu- sion analysis are listed for further study.

关键词： Information diffusion influence evaluation influence maximization information source detection social network.

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Eighth International Workshop on Trichoderma and Gliocladium

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浙江大学学报（农业与生命科学版） 2004年第4期30卷 383-384页

作者： xu,tong MatteoLorito GaryHarman ZhejiangUniversity China UniversityofNapoli Italy CornellUniversity USA

The International Workshop on Trichoderma and Gliocladiurn has been a regularly organized meeting since 1984, and promotes presentation of research as well as discussion of new ideas among scientists working on variou...

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Experimental Study of Influence of Fuel Ratio on Combustion Characteristics of Diesel-Wetted Wood Powder

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Journal of Thermal Science 2020年第4期29卷 884-892页

作者： CHEN Changkun LEI Peng ZHANG Yulun XIAO Huang xu tong JIAO Weibing State Key Laboratory of Disaster Prevention and Reduction for Power Grid Transmission and Distribution Equipment State Grid Hunan Electric Company Limited Disaster Prevention and Reduction CenterChangsha 410007China Institute of Disaster Prevention Science and Safety Technology Central South UniversityChangsha 410075China

In this study, experiments were conducted to examine the influence of the fuel ratio(i.e., the ratio of diesel mass to wood powder mass) on the combustion characteristics of diesel-wetted wood powder, in which 0# diesel and poplar wood powder were used and well mixed. The fuel ratios were set to 0, 0.5, 1.0, 1.5, and 2.0. Fire behaviors, temperature distributions, mass loss rates, and CO concentrations were measured and analyzed. The results showed that because of the coupled effect of evaporation and the capillary force, the ignition point of diesel-wetted wood powder(less than 3°C) dropped dramatically as compared with that of pure wood powder(higher than 280°C) and pure diesel(higher than 107°C). At the early stage of combustion, diesel is lifted upwards by the capillary force, increasing both the concentration of diesel vapor and the temperature at the surface. When the surface temperature reaches that of the pyrolysis of wood powder, considerable pyrolysis gas emerges and combusts. As the flammable gas is consumed gradually, carbon combusts prominently when plenty of oxygen diffuses to its surface. Regarding the influence of the fuel ratio, the results showed that in cases with lower fuel ratios, the combustion was not self-sustainable. When the fuel ratio was relatively high, the temperature at the flame center was lower owing to incomplete combustion. More CO could be found in cases with higher fuel ratios in the early and late stages of combustion. The results could help to improve knowledge regarding combustion of fuel-wetted wood powder.

关键词： diesel-wetted wood powder fuel ratio flammability combustion characteristics

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High-performance self-powered ultraviolet photodetector in SnO_(2)microwire/p-GaN heterojunction using graphene as charge collection medium

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Journal of Materials Science & Technology 2023年第7期138卷 183-192页

作者： tong xu Mingming Jiang Peng Wan Yang Liu Caixia Kan Daning Shi College of physics MIIT Key Laboratory of Aerospace Information Materials and PhysicsKey Laboratory for Intelligent Nano Materials and DevicesNanjing University of Aeronautics and AstronauticsNanjing 211106China

Graphene monolayer has been extensively applied as a transparency electrode material in photoelectronic devices due to its high transmittance,high carrier mobility,and ultrafast carrier *** this study,a high-performance self-powered photodetector,which is made of a SnO_(2)microwire,p-type GaN film,and monolayer graphene transparent electrode,was proposed and *** detector is sensitive to ultraviolet light signals and illustrates pronounced detection performances,including a peak respon-sivity∼223.7 mA W^(-1),a detectivity∼6.9×10^(12)Jones,fast response speed(rising/decaying times∼18/580μs),and excellent external quantum efficiency∼77%at 360 nm light illumination without exter-nal power *** with the pristine SnO_(2)/GaN photodetector using ITO electrode,the device performances of responsivity and detectivity are significantly increased over 6×10^(3)%and 3×10^(3)%,*** performance-enhanced characteristics are mainly attributed to the high-quality het-erointerface of n-SnO_(2)/p-GaN,the highly conductive capacity,and the unique transparency of graphene ***,the built-in potential formed at the SnO_(2)/GaN heterojunction interface could be strengthened by the Schottky potential barrier derived from the graphene electrode and SnO_(2)wire,en-hancing the carrier collection efficiency through graphene as a charge collection *** work is of great importance and significance to developing excellent-performance ultraviolet photodetectors for photovoltaic and optoelectronic applications in a self-powered operation manner.

关键词： Self-powered photodetector SnO_(2)microwires Monolayer graphene electrode Heterojunction Schottky barrier

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High-mobility induced high-performance self-powered ultraviolet photodetector based on single ZnO microwire/PEDOT:PSS heterojunction via slight ga-doping

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Journal of Materials Science & Technology 2021年第34期93卷 33-40页

作者： Peng Wan Mingming Jiang tong xu Yang Liu Caixia Kan College of Science MIIT Key Laboratory of Aerospace Information Materials and PhysicsKey Laboratory for Intelligent Nano Materials and DevicesNanjing University of Aeronautics and AstronauticsNo.29 Jiangjun RoadNanjing 211106P.R.China

Semiconductor micro/nanostructures with broad bandgap can provide powerful candidates for fabricating ultraviolet photodetectors(PDs)due to their proper bandgap,unique optoelectronic properties,large surface-to-volume ratio and good ***,semiconducting micro/nanostructures suffer from low electron conductivity and abundant surface defects,which greatly limits their practical application in developing *** this work,an ultraviolet PD consisting of single Ga-doped ZnO microwire(ZnO:Ga MW)and p-type poly(3,4 ethylenedioxythiophene):poly(styrenesulfonate)(PEDOT:PSS)was *** exposed to ultraviolet illumination,the PD exhibits excellent performance(responsivity~185 m A/W,detectivity~2.4×10^(11) Jones,and fast response speed of~212μs for rise time and~387μs for decay time)under self-driven *** with that of an undoped Zn O MWbased PD,the responsivity and detectivity of ZnO:Ga MW/PEDOT:PSS PD are significantly enhanced over 400%and 600%,*** to the incorporation of Ga element,the charge transport properties of a ZnO:Ga MW,specifically for the mobility,are effectively enhanced,which can substantially facilitate the generation,separation,transport and harvest efficiency of photo-generated carriers in the asfabricated ***,the Ga-incorporation improves the crystalline quality of MWs and reduces surface state density,further suggesting a high-quality ZnO:Ga MW/PEDOT:PSS *** work provides a potential approach for designing high-performance self-powered ultraviolet PDs from the aspect of enhancing carrier transport through fine doping.

关键词： UV Photodetectors Self-powered Mobility High performance Microwire

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Removing Solar Radiation Based on the Empirical Mode Decomposition Method for Seismo-Ionospheric Anomaly Before the M9.0 Tohoku Earthquake

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空间科学学报 2013年第5期33卷 518-524页

作者： HU Yanli xu tong WU Jian National Key Laboratory of Electromagnetic Environment China Research Institute of Radiowave Propagation

The ionospheric effect from solar activity can be seen as the background in the process of detecting the ionospheric precursor prior to strong *** ionospheric variation induced by the forthcoming earthquake can be covered by the strong solar background during the period of high solar *** issue of how to remove the ionospheric effect from solar radiation is of outstanding *** this paper,a method of Empirical Mode Decomposition(EMD) is used to eliminate the solar *** a case study,the global ionospheric map TEC before the M9.0 Tohoku earthquake on 11 March 2011 is *** the effect of solar radiation is removed using the EMD method,the precursor of the imminent earthquake is more *** ionospheric anomaly had a local character and only appeared close to the earthquake epicenter while the useful signals were covered by the solar radiation background with traditional method,which implies that the EMD method is effective in eliminating solar radiation background.

关键词： Ionospheric disturbances Solar radiation EMD method

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Decomposition analysis of CO_(2) emissions of electricity and carbon-reduction policy implication: a study of a province in China based on the logarithmic mean Divisia index method

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Clean Energy 2023年第2期7卷 340-349页

作者： Fuyuan Yang Xiaobin Yang xueqin Tian Xinlei Wang tong xu State Grid Economic and Technological Research Institute Co. LtdBeijing102209China State Grid Jiangxi Electric Power Research Institute State Grid Jiangxi Electric Power Co.LtdNanchangChina

As the proportion of electricity in final energy consumption gradually increases,CO_(2) emissions reduction actions in the power system will become the key to achieving China’s carbon-peak and carbon-neutrality *** is essential to analyse and quantify the driving forces of CO_(2) emissions from electricity generation in the fossil-rich area in *** paper aims to identify the characteristics of CO_(2) emissions generated by electricity and provide a basis for formulating CO_(2)-reduction policies in power ***,we analyse the current state of CO_(2) emissions from electricity generation in Anhui Province that was dominated by fossil energy during the period ***,we apply the logarithmic mean Divisia index method to find the nature of the factors influencing the changes in CO_(2) ***,we analyse the CO_(2)-reduction measures of each side of the source-network-load-storage of the power system in Anhui through a power-system carbon-reduction path analysis model proposed in this study and provide policy *** results showed the following.(i)CO_(2) emissions in Anhui Province continued to increase from 2010 to 2019 and the trend in the growth rate of CO_(2) emissions presented approximately a u-shaped curve.(ii)Economic activity has always been the dominant factor driving the growth of electricity CO_(2) *** increase in the proportion of renewable energy in power generation,the improvement in thermal power-conversion efficiency and the decrease in the intensity of power consumption are the three major driving factors for the reduction in CO_(2) emissions from power generation in Anhui.(iii)The CO_(2)-reduction measures of the power system are provided in each link of the source-network-load-storage,such as developing the photovoltaic industry and building energy storage,upgrading and transforming coal-fired power stations,redu-cing the loss rate of transmission lines on the grid side and improving the efficiency

关键词： CO_(2)emissions LMDI electricity generation carbon-reduction measures

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