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ATLRec:An Attentional Adversarial Transfer Learning Network for Cross-Domain Recommendation

Journal of Computer Science & Technology 2020年第4期35卷 794-808页

作者： ying Li Jia-jie xu Peng-Peng Zhao Jun-Hua Fang Wei Chen Lei Zhao School of Computer Science and Technology Soochow UniversitySuzhou 215006China

Entity linking is a new technique in recommender systems to link users'interaction behaviors in different domains,for the purpose of improving the performance of the recommendation ***-based cross-domain recom-mendation aims to alleviate the data sparse problem by utilizing the domain-sharable knowledge from auxiliary ***,existing methods fail to prevent domain-specific features to be transferred,resulting in suboptimal *** this paper,we aim to address this issue by proposing an adversarial transfer learning based model ATLRec,which effec-tively captures domain-sharable features for cross-domain *** ATLRec,we leverage adversarial learning to generate representations of user-item interactions in both the source and the target domains,such that the discrimina-tor cannot identify which domain they belong to,for the purpose of obtaining domain-sharable *** each domain learns its domain-specific features by a private feature *** recommendation of each domain considers both domain-specific and domain-sharable *** further adopt an attention mechanism to learn item latent factors of both domains by utilizing the shared users with interaction history,so that the representations of all items can be learned sufficiently in a shared space,even when few or even no items are shared by different *** this method,we can represent all items from the source and the target domains in a shared space,for the purpose of better linking items in different domains and capturing cross-domain item-item relatedness to facilitate the learning of domain-sharable *** proposed model is evaluated on various real-world datasets and demonstrated to outperform several state-of-the-art single-domain and cross-domain recommendation methods in terms of recommendation accuracy.

关键词： adversarial transfer learning attention mechanism cross-domain recommendation entity linking

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Effective Crowd Anomaly Detection Through Spatio-temporal Texture Analysis

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International Journal of Automation and computing 2019年第1期16卷 27-39页

作者： Yu Hao Zhi-jie xu ying Liu Jing Wang Jiu-Lun Fan School of Computer Science and Technology Xi'an University of Posts and Telecommunications School of Computing and Engineering University of Huddersfield Faculty of Arts Computing Engineering and Sciences Sheffield Hallam University

Abnormal crowd behaviors in high density situations can pose great danger to public safety. Despite the extensive installation of closed-circuit television(CCTV) cameras, it is still difficult to achieve real-time alerts and automated responses from current systems. Two major breakthroughs have been reported in this research. Firstly, a spatial-temporal texture extraction algorithm is developed. This algorithm is able to effectively extract video textures with abundant crowd motion details. It is through adopting Gaborfiltered textures with the highest information entropy values. Secondly, a novel scheme for defining crowd motion patterns(signatures)is devised to identify abnormal behaviors in the crowd by employing an enhanced gray level co-occurrence matrix model. In the experiments, various classic classifiers are utilized to benchmark the performance of the proposed method. The results obtained exhibit detection and accuracy rates which are, overall, superior to other techniques.

关键词： Crowd behavior spatial-temporal texture gray level co-occurrence matrix information entropy

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Controllability of an underactuated spacecraft with one thruster under disturbance

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Acta Mechanica Sinica 2012年第3期28卷 838-847页

作者： Dong-Xia Wang ying-Hong Jia Lei Jin Hai-Chao Gui Shi-jie xu Department of Guidance Navigation and ControlSchool of AstronauticsBeihang University100191 BeijingChina

For an underactuated spacecraft using only one thruster, the attitude controllability with respect to the or- bit frame is studied in the presence of periodical oscillation disturbance, which provides a preconditional guide on de- signing control law for underactuated attitude control sys- tem. Firstly, attitude dynamic model was established for an underactuated spacecraft, and attitude motion was described using the special orthogonal group （SO （3））. Secondly, Liou- ville theorem was used to confirm that the flow generated by the drift vector of the underactuated attitude control system is volume-preserving. Furthermore, according to Poincar6＇s re- currence theorem, we draw conclusions that this drift field is weakly positively poisson stable （WPPS）. Thirdly, the suffi- cient and necessary condition of controllability was obtained on the basis of lie algebra rank condition （LARC）. Finally, the controllable conditions were analyzed and simulated in different cases of inertia matrix with the installed position of thruster.

关键词： Underactuated spacecraft Periodical oscilla-tion disturbance. Controllability. Weakly positively poissonstable ~ Lie algebra

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Displaced orbits generated by solar sails for the hyperbolic and degenerated cases

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Acta Mechanica Sinica 2012年第1期28卷 211-220页

作者： Ming xu Shi-jie xu Department of Aerospace Engineering School of AstronauticsBeihang University100191 BeijingChina

Displaced non-Keplerian orbits above planetary bodies can be achieved by orientating the solar sail normal to the sun line. The dynamical systems techniques are employed to analyze the nonlinear dynamics of a displaced orbit and different topologies of equilibria are yielded from the basic configurations of Hill＇s region, which have a saddlenode bifurcation point at the degenerated case. The solar sail near hyperbolic or degenerated equilibrium is quite unstable. Therefore, a controller preserving Hamiltonian structure is presented to stabilize the solar sail near hyperbolic or degenerated equilibrium, and to generate the stable Lissajous orbits that stay stable inside the stabilizing region of the controller. The main contribution of this paper is that the controller preserving Hamiltonian structure not only changes the instability of the equilibrium, but also makes the modified elliptic equilibrium become unique for the controlled system. The allocation law of the controller on the sail＇s attitude and lightness number is obtained, which verifies that the controller is realizable.

关键词： Solar sail Displaced orbit Stable Lissajous orbits Hyperbolic equilibrium Degenerated equilibrium

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Vaccination of a multi-group model of zoonotic diseases with direct and indirect transmission

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International Journal of Biomathematics 2019年第6期12卷 119-146页

作者： Wei Lv xue-ying Liu Xin-Jian xu jie Lou Department of Mathematics Shanghai University Shanghai200444P.R.China Institute of Systems Science Shanghai University Shanghai 200444P.R.China

Vaccination plays an important role in preventing or reducing the spread of zoonotic *** this paper,we develop a susceptible-vaecinated-exposed-infectious-pathogen multi-group epidemic model of zoonotic diseases incorporating nonlinear direct and indi rect incidence rates,nonlinear pathogen shedding rates,and common environmental *** certain assumptions,we first obtained the basic reproduction number of the ***,we utilized the comparison principle and global Lyapunov function method to prove global stability of dynamical ***,we analyzed optimal vaccination *** the theoretical predictions were verified by numerical simulations.

关键词： Vaccination global stability optimal control zoonotic diseases.

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National Natural Science Foundation of China leads the comprehensive development of basic research in the field of male reproductive health in China

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Asian Journal of Andrology 2020年第6期22卷 547-548页

作者： Shu-jie Liao Yan-ying xu Rui-Juan Sun Qun-Yan Lyu Department of Health Science National Natural Science Foundation of ChinaBeijing 100085China Department of Obstetrics and Gynecology Tongji HospitalTongji Medical CollegeHuazhong University of Science and TechnologyWuhan 430030China

"Reproductive health"was officially defined as humans and their individual activities related to reproduction throughout their lives,which should be in good health in physical,psychological,and social aspects.1 The basic research on male reproductive health in China can be traced back to the 1960s.2 Since the National Natural Science Foundation of China(NSFC)began systematic support for basic research on male reproductive health in 1988,the field has been systematically developed in *** this regard,we analyze the role of the NSFC on the development of basic research in the field of male reproductive health in China.

关键词： NSFC China. field

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脉图绘制训练法在脉诊教学中的应用及效果评价

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中医教育 2017年第3期36卷 17-20页

作者：王静曲宏达段新芬余洁英许文学南方医科大学中医药学院广州510515

脉图绘制训练法是针对脉诊教学中脉象抽象、难理解的特点而创立的辅助教学的一种实训方法。通过与常规脉诊理论教学的对比研究,脉图绘制辅助常规理论教学的实验组,教学效果明显优于常规理论教学的对照组。该法主要是强化学生在脉诊过程... 详细信息

脉图绘制训练法是针对脉诊教学中脉象抽象、难理解的特点而创立的辅助教学的一种实训方法。通过与常规脉诊理论教学的对比研究,脉图绘制辅助常规理论教学的实验组,教学效果明显优于常规理论教学的对照组。该法主要是强化学生在脉诊过程进行心理构建,使抽象的脉象具体化。学生通过绘制脉图可以加深对脉象的理解,重新塑造脉象的立体化形象,促进教学效果提升。

关键词：脉图绘制中医诊断效果评价

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Recognizing Social Function of Urban Regions by Using Data of Public Bicycle Systems

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Chinese Journal of Electronics 2019年第1期28卷 13-20页

作者： xu Haitao ying Jing College of Computer Science and Technology Zhejiang University

Obtaining the classification of urban functions is an integral part of urban planning. Currently,public bicycle systems are booming in these years. It conveys human mobility and activity information, which can be closely related to the social function of an urban region. This paper discusses the potential use of public bicycle systems for recognizing the social function of urban regions by using one year’s rent/return data of public bicycles. We found that rent/return dynamics, extracted from public bicycle systems, exhibited clear patterns corresponding to the urban function classes of these regions. With seven features designed to characterize the rent/return pattern, our method based on Smooth support vector machine(SSVM) is proposed to recognize social function classes of urban regions. We evaluate our method based on the large-scale real-world dataset collected from the public bicycle system of Hangzhou. The results show that our method can efficiently recognize different types of urban function areas. Classification results using the proposed SSVM achieved the best classification accuracy of 96.15%.

关键词： Urban regions recognition Public bicycle system Social function classification Smooth support vector machine(SSVM)

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Effects of pulse magneto-oscillation on GCr15 bearing steel continuous casting billet

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Journal of Iron and Steel Research International 2022年第1期29卷 144-150页

作者： Yan-jie Liu Guo-dong xu ying-chun Wang Hong-gang Zhong Li-juan Li Biao Wang Qi-jie Zhai Materials Genome Institute Shanghai UniversityShanghai 200444China Center for Advanced Solidification Technology Shanghai UniversityShanghai 200444China Research Institute China Baowu Steel Group CorporationShanghai 200431China Steel Plant China Baowu Steel Group CorporationShanghai 200431China

Pulse magneto-oscillation(PMO)added during solidification could affect the solidification structure and macrosegregation.A modified thermal simulation equipment was applied to prepare GCr15 bearing steel continuous casting billets with different PMO peak ***,metallographic analysis,component analysis and numerical simulation were adopted to study the influence of PMO peak current and its *** sample with 150 K_(I)A PMO peak current treatment has little difference with the samples without PMO treatment on solidification structure and *** the peak currents are 250 and 350 K_(I)A,the columnar zone increases and macrosegregation *** 450 K_(I)A peak current is selected,the equiaxed grain ratio is enlarged,and the dendritic grains are refined,and the macrosegregation of C,Cr,Si and Mn is decreased *** analyzing,different convections induced by PMO with various peak currents are the key factor to change the solidification structure and macrosegregation.

关键词： Bearing steel Numerical simulation Thermal simulation Pulse magneto-oscillation

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Bioinspired flexible,high-strength,and versatile hydrogel with the fiberboard-and-mortar hierarchically ordered structure

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Nano Research 2021年第10期14卷 3643-3652页

作者： Han-Ping Yu ying-jie Zhu State Key Laboratory of High Performance Ceramics and Superfine Microstructure Shanghai Institute of CeramicsChinese Academy of SciencesShanghai 200050China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China

The synthetic hydrogels with high water contents are promising for various applications,however,they usually exhibit low mechanical *** this work,inspired by the natural biological soft tissues,whose hierarchically ordered fibrous structures result in high strength and good flexibility,a flexible,high-strength,and versatile hydrogel with the fiberboard-and-mortar hierarchically ordered structure(HFMOS)is developed based on ultralong hydroxyapatite(HAP)nanowires and polyacrylic acid(PAA).The as-prepared HFMOS hydrogel has a high water content(~70 wt.%),dense structure,and excellent mechanical properties,and these properties are similar to those of the human cartilage and are superior to many hydrogels reported in the *** excellent mechanical properties of the HFMOS hydrogel originate from the combination of the fiberboard-and-mortar hierarchically ordered structure,reinforcement of ultralong HAP nanowires,strong interfacial strength,and multiple energy dissipation ***,thanks to the controllable components and injection procedure,the HFMOS hydrogel with a Janus structure is prepared for particular *** HFMOS hydrogel possesses abundant ordered water channels,and can be used for loading,release,and directed delivery of various functional ***,the as-prepared flexible,high-strength,and versatile HFMOS hydrogel possesses a great potential for various applications such as water purification,pollution treatment,biomedicine,nanofluidic devices,and high-performance structural materials.

关键词： hydrogel nanowire hydroxyapatite ordered structure

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