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SGNR: A Social Graph Neural Network Based Interactive Recommendation Scheme for E-Commerce

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Tsinghua Science and Technology 2023年第4期28卷 786-798页

作者： Dehua ma Yufeng Wang jianhua ma Qun Jin School of Communications and lnformation Engineering Nanjing University of Posts and TelecommunicationsNanjing 210003China Department the Faculty of Computer and Information SciencesHosei UniversityTokyo 194-0298Japan Networked Information Systems Laboratory Department of Human Informatics and Cognitive SciencesFaculty of Human SciencesWaseda UniversityTokyo 169-8050Japan

Interactive Recommendation(IR)formulates the recommendation as a multi-step decision-making process which can actively utilize the individuals’feedback in multiple steps and optimize the long-term user benefit of *** Reinforcement Learning(DRL)has witnessed great application in IR for ***,user cold-start problem impairs the learning process of the DRL-based recommendation ***,most existing DRL-based recommendations ignore user relationships or only consider the single-hop social relationships,which cannot fully utilize the social *** fact that those schemes can not capture the multiple-hop social relationships among users in IR will result in a sub-optimal *** address the above issues,this paper proposes a Social Graph Neural network-based interactive Recommendation scheme(SGNR),which is a multiple-hop social relationships enhanced DRL *** this framework,the multiple-hop social relationships among users are extracted from the social network via the graph neural network which can sufficiently take advantage of the social network to provide more personalized recommendations and effectively alleviate the user cold-start *** experimental results on two real-world datasets demonstrate that the proposed SGNR outperforms other state-of-the-art DRL-based methods that fail to consider social relationships or only consider single-hop social relationships.

关键词： Interactive Recommendation(IR) Deep Reinforcement Learning(DRL) Graph Neural Network(GNN)

The protective effect of caffeine on DNA photosensitive damage:A gel electrophoresis

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Nuclear Science and Techniques 2009年第4期20卷 223-227页

作者： HUANG Liping ma jianhua College of Biology Engineering Jimei University Xiamen 361021 China

Agarose gel electrophoresis was performed to study interaction effect of caffeine on photosensitive injury of DNA caused by anthraquinone-2-sulphonic acid disodium(AQS),a model compound of strong photosensitizer,under 254 nm or 365nm UV irradiation Photosensitive injury of DNA induced by AQS under deoxidized condition was used as *** results show that caffeine may resist effectively the injury effect of photosensitive damage and strong UV irradiation on *** effects depend on the caffeine and AQS concentration,and irradiation *** in concentration of 0.01-3.0μg/μL,may prevent DNA from damage induced by UV light,but caffeine in concentration of>5.0μg/μL accelerates the DNA *** particular,in the aqueous solution system of DNA,caffeine and AQS,at pH 6.25-7.35,the caffeine in concentration of 2.5-4.50μg/μL may resist the photosensitive injury of DNA caused by AQS under the deoxidized condition and exposure by 254 nm UV for 10 *** caffeine in concentration of 5μg/μL would present a synergetic effect on the photosensitive injury of *** molecular mechanism also is discussed.

关键词：凝胶体电泳 DNA UV照射核技术

CAN:Effective Cross Features by Global Attention Mechanism and Neural Network for Ad Click Prediction

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Tsinghua Science and Technology 2022年第1期27卷 186-195页

作者： Wenjie Cai Yufeng Wang jianhua ma Qun Jin Nanjing University of Posts and Telecommunications(NJUPT) Nanjing210003China Digital Media Department in the Faculty of Computer and Information Sciences Hosei UniversityTokyo 163-8001Japan Networked Information Systems Laboratory Department of Human Informatics and Cognitive SciencesWaseda UniversityTokyo 163-8001Japan

Online advertising click-through rate(CTR) prediction is aimed at predicting the probability of a user clicking an ad,and it has undergone considerable development in recent *** of the hot topics in this area is the construction of feature interactions to facilitate accurate *** machine provides second-order feature interactions by linearly multiplying hidden feature ***,real-world data present a complex and nonlinear ***,second-order feature interactions are unable to represent cross information *** drawback has been addressed using deep neural networks(DNNs),which enable high-order nonlinear feature ***,DNN-based feature interactions cannot easily optimize deep structures because of the absence of cross information in the original *** this study,we propose an effective CTR prediction algorithm called CAN,which explicitly exploits the benefits of attention mechanisms and DNN *** attention mechanism is used to provide rich and expressive low-order feature interactions and facilitate the optimization of DNN-based predictors that implicitly incorporate high-order nonlinear feature *** experiments using two real datasets demonstrate that our proposed CAN model performs better than other cross feature-and DNN-based predictors.

关键词： click-through rate prediction global attention mechanism feature interaction neural network

Enhanced Flexoelectric Response from Functionally Gradient Electrets Undergoing Crumpling Deformation

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Acta Mechanica Solida Sinica 2024年第4期37卷 541-554页

作者： jianhua ma Jinrui Xu Jun Li Binglei Wang Department of Engineering Mechanics Shandong UniversityJinan250061China

Non-uniform deformation of the dielectric subjected to external forces can induce the flexoelectric effect, a phenomenon that couples electrical polarization to strain gradients. However, limited by the size effects, flexoelectricity is not significant at the macroscale and only becomes catchable at the microscale and nanoscale. In recent work, we obtained a considerable flexoelectric-like response by crumpling the dielectric embedded with charges, i.e., the electret, which significantly improved the flexoelectric effect at the macroscale. In this work, we further optimize the macroscopic performance of the flexoelectric response by applying gradient treatment to the electret films. Specifically, we analytically derive the electromechanical coupling of crumpled electret films with gradients of different thicknesses, charge densities, and Young’s moduli as key design variables. It is shown that the gradient-oriented electret film can be tuned to nearly five times that of a uniform electret film.

关键词： Functionally gradient electret Size effects Crumpling Flexoelectric-like response

An Integrated Incentive Framework for Mobile Crowdsourced Sensing

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Tsinghua Science and Technology 2016年第2期21卷 146-156页

作者： Wei Dai Yufeng Wang Qun Jin jianhua ma College of Telecommunications and Information Engineering Nanjing University of Posts and TelecommunicationsNanjing 210003China. Department of Human Informatics and Cognitive Sciences Waseda UniversitySaitama 359-1192Japan. Faculty of Computer&Information Sciences Hosei UniversityTokyo 184-8584Japan

Currently, mobile devices （e.g., smartphones） are equipped with multiple wireless interfaces and rich builtin functional sensors that possess powerful computation and communication capabilities, and enable numerous Mobile Crowdsourced Sensing （MCS） applications. Generally, an MCS system is composed of three components： a publisher of sensing tasks, crowd participants who complete the crowdsourced tasks for some kinds of rewards, and the crowdsourcing platform that facilitates the interaction between publishers and crowd participants. Incentives are a fundamental issue in MCS. This paper proposes an integrated incentive framework for MCS, which appropriately utilizes three widely used incentive methods： reverse auction, gamification, and reputation updating. Firstly, a reverse-auction-based two-round participant selection mechanism is proposed to incentivize crowds to actively participate and provide high-quality sensing data. Secondly, in order to avoid untruthful publisher feedback about sensing-data quality, a gamification-based verification mechanism is designed to evaluate the truthfulness of the publisher＇s feedback. Finally, the platform updates the reputation of both participants and publishers based on their corresponding behaviors. This integrated incentive mechanism can motivate participants to provide high-quality sensed contents, stimulate publishers to give truthful feedback, and make the platform profitable.

关键词： mobile crowdsourced sensing incentive mechanism reverse auction gamification reputation updating

Trends of Urban Air Pollution in Zhengzhou City in 1996-2008

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Chinese Geographical Science 2012年第4期22卷 402-413页

作者： DU Xile LU Changhe WANG Hairong ma jianhua Institute of Geographic Sciences and Natural Resources Research Chinese Academy Sciences Beoing 100101 China' Graduate University of Chinese Academy of Sciences Beijing 100049 China The Second Battalion ofNon-ferrous Metal Geology and Mineral Resources Bureau Zhengzhou 450016 China Institute ofNatural Resources and Environmental Science Henan University Kaifeng 475004 China)

Urban air pollution is a commonly concerned environmental problem in the world. Identification of air quality trend using long-term monitoring data is helpful to understand the effectiveness of pollution control strategies. This study, using data from six monitoring stations in Zhengzhou City, analyzed the changing trend in concentrations of SO2, NOJNO2 and TSP/PM10 in 1996-2008, based on non-parametric mann-Kendall test and Sen＇s slope estimator, and evaluated the comprehensive air pollution level using Multi-Pollutant Index （MPI）. It was found that the concen- tration of each pollutant exceeded obviously the World Health Organization （WHO） guideline value, but the changing trend varied： SO2 and NO2 were significantly increased mainly due to an increase in coal consumption and vehicle number, while NOx, TSP and PM10 decreased. The air pollution was serious, and differed markedly among the three functional regions： it is the most severe in the Industrial and Residential Area （IRA）, followed by the Transportation Hub and Business District （THBD）, and then the High-tech, Cultural and Educational Area （HCEA）. Different from NO2 concentration that had a similar change trend/rate among the function regions, the change rate of PM10 concentra- tion differed spatially, decreased much more obviously in THBD than other two regions. For the whole city, the com- prehensive air pollution level declined gradually, illustrating that the air quality in Zhengzhou was improved in the last decade.

关键词： urban air pollution mann-Kendall test Sen's method Multi-Pollutant Index (MPI) Zhengzhou

Energy-Efficient Architecture and Technologies for Device to Device(D2D) Based Proximity Service

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China Communications 2015年第12期12卷 32-42页

作者： ZHANG Bo WANG Yufeng JIN Qun ma jianhua Nanjing University of Posts and Telecommunications Waseda University Hosei University

Considering that modern mobile terminals possess the capability to detect users' proximity,and offer means to directly communicate and share content with the people in close area,Device-to-Device(D2D) based Proximity Services(ProSe) have recently witnessed great development,which enable users to seek for and utilize relevant value in their physical proximity,and are capable to create numerous new mobile service ***,without a breakthrough in battery technology,the energy will be the biggest limitation for *** incorporating the features of ProSe(D2D communication technologies,abundant built-in sensors,localization-dependent,and context-aware,etc.),this paper thoroughly investigates the energy-efficient architecture and technologies for ProSe from the following four aspects:underlying networking technology,localization,application and architecture features,context-aware and user *** exploring specific energy-efficient schemes pertaining to each aspect,this paper offers a perspective for research and *** brief,through classifying,summarizing and optimizing the multiple efforts on studying,modeling and reducing energy consumption for ProSe on mobile devices,the paper would provide guide for developers to build energy-efficient ProSe.

关键词： aware localization terminals users networking utilize Bluetooth D2D battery enable

Microbionic and peristaltic robots in a pipe

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Chinese Science Bulletin 2000年第11期45卷 985-988页

作者： ma Jianxu LIU Xiang ma jianhua LI Mingdong ma Peisun School of Mechanical Engineering Shanghai Jiaotong University.Shanghai 200030China Pericom Technology Co.Ltd. Shanghai 200233China Pingquan Normal College Pingquan 067500China

A microbionic and peristaltic robot that simulates the motion of an earthworm to move within a micropipe is proposed. The robot consists of three flexible units. Each unit is composed of two plates connected with three shape memory alloys (Sma) 120° apart, the rubber gasbag around the Sma wires inflated with air inside. Each unit corresponds to a segment of an earthworm, and the Sma and rubber gasbag have the same functions as the cricoid and longitudinal muscles of the earthworm. A control system is designed to fulfill the control of the three flexible units motions, such as stretching, shrinking and bending, so the microrobot can walk forward and backward, and choose the direction.

关键词： microrobot simulating earthworm soft pipe.

On demand bidirectional shape transformations and novel chiral actuators of photomediated shape memory polymer film based on photothermal OEGy-W_(18)O_(49)nanowires

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Science China(Technological Sciences) 2023年第12期66卷 3585-3595页

作者： TIAN GuangMing WANG Bo HE XinHai WANG Chen YANG Dong ma jianhua Department of Polymer materials and Engineering School of Materials EngineeringXi’an Polytechnic UniversityXi’an 710048China Xi’an Aerospace Chemical Propulsion Factory Co.Ltd. Xi’an 710025China

The spatially controllable shape-shifting behaviors of a planar two-dimensional(2D)film to three-dimensional(3D)shapes upon external stimuli are of paramount significance for the development of smart ***,the present work focuses on fabricating plain film whose shape can be remotely and spatially transformed into various 3D configurations via the formation of a laser-induced temperature gradient;when subjected to laser irradiation,the prestretched hybrid films exhibit out-of-plane bending behavior owing to anisotropic chain relaxation and strain energy *** this basis,various sophisticated shape transformations can be achieved by site-specific irradiations of laser with a controllable ***,shape morphing involving reversible bending transformations can also be realized by employing the laser on the corresponding opposite side of the hybrid ***,under a 160 mW/cm^(2) simulated sunlight illumination,the transformation of flat 2D film into 3D chiral actuators is driven by material anisotropy and geometrical heterogeneity of a bilayer strip design,and it yields right and left-handed helix,the morphologies of the helix shape can be precisely tailored by the strip angles and strain values.

关键词： shape-shifting temperature gradient out-of-plane bending chiral actuators anisotropy