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Preference transfer model in collaborative filtering for implicit data

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Frontiers of Information Technology & Electronic Engineering 2016年第6期17卷 489-500页

作者： Bin JU Yun-tao QIAN min-chao ye Institute of Artificial Intelligence College of Computer Science and TechnologyZhejiang UniversityHangzhou 3100Z7China Health Information Center of Zhejiang Province Hangzhou 310006China

Generally, predicting whether an item will be liked or disliked by active users, and how much an item will be liked, is a main task of collaborative filtering systems or recommender systems. Recently, predicting most likely bought items for a target user, which is a subproblem of the rank problem of collaborative filtering, became an important task in collaborative filtering. Traditionally, the prediction uses the user item co-occurrence data based on users' buying behaviors. However, it is challenging to achieve good prediction performance using traditional methods based on single domain information due to the extreme sparsity of the buying matrix. In this paper, we propose a novel method called the preference transfer model for effective cross-domain collaborative filtering. Based on the preference transfer model, a common basis item-factor matrix and different user-factor matrices are *** user-factor matrix can be viewed as user preference in terms of browsing behavior or buying behavior. Then,two factor-user matrices can be used to construct a so-called ‘preference dictionary' that can discover in advance the consistent preference of users, from their browsing behaviors to their buying behaviors. Experimental results demonstrate that the proposed preference transfer model outperforms the other methods on the Alibaba Tmall data set provided by the Alibaba Group.

关键词： Recommender systems Collaborative filtering Preference transfer model Cross domain Implicit data

Positional and Quantitative Characterization of the Hydroxyethyl Groups in Hydroxyethyl Starch by GC/MS or NMR

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Chinese Chemical Letters 2002年第11期13卷 1097-1099页

作者： ye min LIU Gui Yun XU Center for Molecular Science Institute of ChemistryChinese Academy of SciencesBeijing 100080

The position and quantity of the hydroxyethyl groups in hydroxyethyl starch (HES) were studied by GC/MS and NMR. Quantitative characterization was carried out based on the results of both methods.

关键词： Hydroxyethyl starch GC/MS NMR.

Nonlinear Evolutions of Stimulated Raman and Brillouin Scattering Processes in Partially Stripped-Ion Plasmas

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Chinese Physics Letters 2001年第9期18卷 1230-1233页

作者： HU ye-min HU Xi-Wei Departmentof Electrical Engineering Huazhong University of Science and TechnologyWuhan 430074 Department of Modern Physics University of Science and Technology of ChinaHefei 230026

Numerical analyses for the nonlinear evolutions of stimulated Raman scattering (SRS) and stimulated Brillouin scattering (SBS) processes are given. Various effects of the second- and third-order nonlinear susceptibilities on the SRS and SBS processes are studied. The nonlinear evolutions of SRS and SBS processes are atfected more efficiently than their linear growth rates by the nonlinear susceptibility.

关键词： Brillouin nonlinear Nonlinear

Tough Biopolymer IPN Hydrogel Fibers by Bienzymatic Crosslinking Approach

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Chinese Journal of Polymer Science 2015年第12期33卷 1741-1749页

作者： Xiao-jiu Liu ye-min Zhang 李新松 School of Chemistry and Chemical Engineering Southeast University

In this report, bienzymatic crosslinking approach was applied to prepare biopolymer hydrogel fibers composed of gelatin and chitosan with an interpenetrating polymer network （IPN） structure. The IPN biopolymer hydrogel fibers were prepared by wet spinning while microbial transglutaminase （mTG） catalyzed the formation of one network of gelatin and horseradish peroxidase （HRP） in the presence of H202 induced another network of chitosan grafted with phloretic acid （chitosan-PA） intertwining with the former. The mechanical performances of the hydrogel fibers were measured by an electronic single fiber strength tester. It was found that the mechanical properties of the gelatin/chitosan IPN hydrogel fibers had a significant improvement with the increase of the concentration of gelatin and chitosan, and the IPN fiber has the highest tension of 38.6 cN and elongation of 387.2%. Accelerated degradation in the presence of papin indicated that the gelatin/chitosan-PA IPN hydrogel fibers own controllable degradability. In addition, biological evaluation indicated the IPN hydrogel fibers can support cell adhesion and proliferation. Moreover, hand weaving trail showed the knittablity of the IPN hydrogel fibers. Therefore, the gelatin/chitosan IPN hydrogel fibers prepared by bienzymatic crosslinking approach possess excellent biocompatibility and mechanical strength, which may be desirable candidates for engineering tissue scaffolds.

关键词： Hydrogel fiber Bienzymatic crosslinking Gelatin Interpenetrating polymer network Mechanical strength.

Modeling and analysis of self-similar traffic source based on fractal-binomial-noise-driven Poisson process

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The Journal of China Universities of Posts and Telecommunications 2006年第3期13卷 61-64页

作者： ZHANG Di ZHANG min ye Pei-da Key Laboratory of Optical Communications and Lightwave Technologies Beijing University of Posts and Telecommunications Beijing 100876 China

This article explores the short-range dependence （SRD） and the long-range dependence （LRD） of self-similar traffic generated by the fractal-binomial-noise-driven Poisson process （FBNDP） model and lays emphasis on the former. By simulation, the SRD decaying trends with the increase of Hurst value and peak rate are obtained, respectively. After a comprehensive analysis of accuracy of self-similarity intensity, the optimal range of peak rate is determined by taking into account the time cost, the accuracy of self-similarity intensity, and the effect of SRD.

关键词： fractal-binomial-noise-driven Poisson process short-range dependence long-range dependence self similarity

Nonlinear identification of systems with parametric excitation

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Science China(Technological Sciences) 2011年第8期54卷 2080-2089页

作者： ye min DOU SuGuang ZHANG Wei ZENG ZhiGang School of Aeronautics and Astronautics Zhejiang University Hangzhou 310027 China College of Mechanical Engineering Beijing University of Technology Beijing 100124 China

In this paper, the incremental harmonic balance nonlinear identification (IHBNID) is presented for modelling and parametric identification of nonlinear systems. The effects of harmonic balance nonlinear identification (HBNID) and IHBNID are also studied and compared by using numerical simulation. The effectiveness of the IHBNID is verified through the Mathieu-Duffing equation as an example. With the aid of the new method, the derivation procedure of the incremental harmonic balance method is simplified. The system responses can be represented by the Fourier series expansion in complex form. By keeping several lower-order primary harmonic coefficients to be constant, some of the higher-order harmonic coefficients can be self-adaptive in accordance with the residual errors. The results show that the IHBNID is highly efficient for computation, and excels the HBNID in terms of computation accuracy and noise resistance.

关键词： nonlinear system identification incremental harmonic balance parameter excitation nonlinear systems

Smoothing strategy for corner of small curvature radius by abrasive waterjet machining

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Advances in Manufacturing 2023年第3期11卷 390-406页

作者： Jian-Feng Chen ye-min Yuan Hang Gao Tian-Yi Zhou State Key Laboratory of High-Performance Precision Manufacturing School of Mechanical EngineeringDalian University of TechnologyDalian 116024People's Republic of China

Abrasive waterjet(AWJ)is widely applied in 2D machining as it offers high machining efficiency and low machining ***,machining a 3D surface,especially for a small curvature radius freeform surface(SCRFS),results in over-erosion of the corner,and has been one of the greatest issues of *** solve this problem,a local smoothing algorithm for SCRFS is developed by the junction of two linear segments at the corner by inserting cubic second-order B-spline to smooth the nozzle path and posture under the setting tolerance error,which is aimed to avoid over-erosion due to the change in dwell *** solutions of the smooth corner position and orientation of the nozzle path are obtained by evaluating a synchronization *** to the set tolerance error of the nozzle position and orientation,the interpolation of the smooth path of the corner meets the constraint conditions of the linear feed *** simulation and experimental results show that the proposed method is validated by the experimental results and has been applied to the integral blisk machining of an aero-engine.

关键词： 5-axis Cubic B-splines Overcut Abrasive waterjet(AWJ) Corner smoothing

Identification of Early Warning Signals of Infectious Diseases in Hospitals by Integrating Clinical Treatment and Disease Prevention

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Current Medical Science 2024年第2期44卷 273-280页

作者： Lei ZHANG min-ye LI Chen ZHI min ZHU Hui MA Sixth Medical Center Chinese PLA General HospitalBeijing100048China The Nursing Department Chinese PLA General HospitalBeijing 100853China

The global incidence of infectious diseases has increased in recent years,posing a significant threat to human *** typically serve as frontline institutions for detecting infectious ***,accurately identifying warning signals of infectious diseases in a timely manner,especially emerging infectious diseases,can be ***,there is a pressing need to integrate treatment and disease prevention data to conduct comprehensive analyses aimed at preventing and controlling infectious diseases within *** paper examines the role of medical data in the early identification of infectious diseases,explores early warning technologies for infectious disease recognition,and assesses monitoring and early warning mechanisms for infectious *** propose that hospitals adopt novel multidimensional early warning technologies to mine and analyze medical data from various systems,in compliance with national strategies to integrate clinical treatment and disease ***,hospitals should establish institution-specific,clinical-based early warning models for infectious diseases to actively monitor early signals and enhance preparedness for infectious disease prevention and control.

关键词： infectious disease disease prevention and control medical data warning signals

Pseudospin-induced chirality with staggered optical graphene

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Light(Science & Applications) 2016年第1期5卷 641-645页

作者： Jian-Long Liu Wei-min ye Shuang Zhang School of Physics and Astronomy University of BirminghamBirmingham B152TTUK Department of Physics Harbin Institute of TechnologyHarbin 150001China College of Optoelectronic Science and Engineering National University of Defense TechnologyChangsha 410073China

Pseudospin has an important role in understanding many interesting physical phenomena that are associated with twodimensional materials such as *** has been proposed to be directly related to angular momentum,and orbital angular momentum was recently experimentally demonstrated to be an intrinsic property of pseudospin in a photonic honeycomb ***,in photonics,the interaction between spin and pseudospin for light has not been *** this letter,we propose that in an optical analog of staggered graphene(that is,a photonic honeycomb lattice waveguide with in-plane inversion symmetry breaking),the pseudospin mode can strongly couple to the spin of an optical beam that is incident in certain *** spin-pseudospin coupling that is caused by the spin-orbit conversion in the scattering process induces a strong optical chiral effect for the transmitted optical ***-pseudospin coupling of light opens the door to the design of pseudospin-mediated spin or valley-selective photonic devices.

关键词： angular momentum chirality pseudospin staggered optical graphene