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A Service Composition Approach Based on Sequence Mining for Migrating E-learning Legacy System to SOA

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International Journal of Automation and computing 2010年第4期7卷 584-595页

作者： Zhuo Zhang dong-Dai zhou Hong-Ji Yang Shao-Chun zhong Software School in Northeast Normal University Changchun 130024 PRC Software Technology Research Laboratory De Montfort University Leicester LE1 9BH UK Institute of Ideal Information and Technology in Northeast Normal University Changchun 130024 PRC Engineering Research Center of E-Learning Technologies Ministry of Education Changchun 130024 PRC

With the fast development of business logic and information technology, today＇s best solutions are tomorrow＇s legacy systems. In China, the situation in the education domain follows the same path. Currently, there exists a number of e-learning legacy assets with accumulated practical business experience, such as program resource, usage behaviour data resource, and so on. In order to use these legacy assets adequately and efficiently, we should not only utilize the explicit assets but also discover the hidden assets. The usage behaviour data resource is the set of practical operation sequences requested by all users. The hidden patterns in this data resource will provide users＇ practical experiences, which can benefit the service composition in service-oriented architecture （SOA） migration. Namely, these discovered patterns will be the candidate composite services （coarse-grained） in SOA systems. Although data mining techniques have been used for software engineering tasks, little is known about how they can be used for service composition of migrating an e-learning legacy system （MELS） to SOA. In this paper, we propose a service composition approach based on sequence mining techniques for MELS. Composite services found by this approach will be the complementation of business logic analysis results of MELS. The core of this approach is to develop an appropriate sequence mining algorithm for mining related data collected from an e-learning legacy system. According to the features of execution trace data on usage behaviour from this e-learning legacy system and needs of further pattern analysis, we propose a sequential mining algorithm to mine this kind of data of tile legacy system. For validation, this approach has been applied to the corresponding real data, which was collected from the e-learning legacy system; meanwhile, some investigation questionnaires were set up to collect satisfaction data. The investigation result is 90% the same with the result obtained thr

关键词： Service composition e-learning sequence mining algorithm service-oriented architecture (SOA) legacy system

Automatic facade recovery from single nighttime image

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Frontiers of Computer Science 2020年第1期14卷 95-104页

作者： Yi zhou Qichuan GENG zhong zhou Wei WU State Key Laboratory of Virtual Reality Technology and Systems Beihang UniversityBeijing 100083China

Nighttime images are difficult to process due to insufficient brightness,lots of noise,and lack of ***,they are always removed from time-lapsed image *** is interesting that nighttime images have a unique and wonderful building features that have robust and salient lighting cues from human *** variation depicts both the statistical and individual habitation,and it has an inherent man-made repetitive structure from architectural *** by this,we propose an automatic nighttime fa?ade recovery method that exploits the lattice structures of window ***,a simple but efficient classification method is employed to determine the salient bright regions,which may be lit *** we groupwindows into multiple lattice proposals with respect to fa?ades by patch matching,followed by greedily removing overlapping *** the horizon constraint,we solve the ambiguous proposals problem and obtain the correct ***,we complete the generated fa?ades by filling in the missing *** method is well suited for use in urban environments,and the results can be used as a good single-view compensation method for daytime *** method also acts as a semantic input to other learning-based 3D image reconstruction *** experiment demonstrates that our method works well in nighttime image datasets,and we obtain a high lattice detection rate of 82.1%of 82 challenging images with a low mean orientation error of 12.1±4.5 degrees.

关键词： facade recovery nighttime images lattice detection

Piezotronic effect enhanced Schottky-contact ZnO micro/nanowire humidity sensors

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Nano Research 2014年第7期7卷 1083-1091页

作者： Guofeng Hu Ranran zhou Ruomeng Yu Lin dong Caofeng Pan zhong Lin Wang Beijing Institute of Nanoenergy and Nanosystems Chinese Academy of Sciences Beijing 100083 China School of Materials Science and Engineering Georgia Institute of Technology Atlanta Georgia 30332-0245 USA

A ZnO micro/nanowire has been utilized to fabricate Schottky-contacted humidity sensors based on a metal-semiconductor-metal （M-S-M） structure. By means of the piezotronic effect, the signal level, sensitivity and sensing resolution of the humidity sensor were significantly enhanced when applying an external strain. Since a higher Schottky barrier markedly reduces the signal level, while a lower Schottky barrier decreases the sensor sensitivity due to increased ohmic transport, a 0.22% compressive strain was found to optimize the performance of the humidity sensor, with the largest responsivity being 1,240%. The physical mechanism behind the observed mechanical-electrical behavior was carefully studied by using band structure diagrams. This work provides a promising way to significantly enhance the overall performance of a Schottky-contact structured micro/nanowire sensor.

关键词： piezotronic effect humidity sensor ZnO micro/nanowire Schottky contact

Properties of A=7-9 Drip-Line Nuclei in RMF Theory

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Communications in Theoretical Physics 2009年第5期51卷 895-898页

作者： WANG Cheng-Bin dong Tie-Kuang REN zhong-zhou ZHU Zhi-Yuan Shanghai Institute of Applied Physics Chinese Academy of Sciences Shanghai 201800 China Department of Physics Nanjing University Nanjing 210093 China Center of Theoretical Nuclear Physics National Laboratory of Heavy=Ion Accelerator at Lanzhou Lanzhou 730000 China

The relativistic mean-field （RMF） theory is used to calculate the properties of A =7-9 drip-line nuclei ^7Li, ^7;9Be, ^8;9B, and ^9C. Systematic deviations between experimental and theoretical binding energies are found. Possible reasons of these systematic deviations are discussed in terms of pairing energy. The root-mean-square （rms） radii of matter distributions for these nuclei agree with the experimental data quite well. The one-proton halo structure in ^8B is reproduced well, and the two-proton halo in ^9C is predicted. The calculations show that the RMF theory is valid in studying the properties of light drip-line nuclei.

关键词： RMF method drip-line nuclei nuclear structure

Neural Emotion Detection via Personal Attributes

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Journal of Computer Science & Technology 2022年第5期37卷 1146-1160页

作者： Xia-Bing zhou zhong-Qing Wang Xing-Wei Liang Min Zhang Guo-dong zhou School of Computer Science and Technology Soochow UniversitySuzhou 215006China Konka AIOT Research Laboratory Konka Group Company LimitedShenzhen 518053China

There has been a recent line of work to automatically detect the emotions of posts in social *** literature,studies treat posts independently and detect their emotions *** from previous studies,we explore the dependence among relevant posts via authors'backgrounds,since the authors with similar backgrounds,e.g.,"gender","location",tend to express similar ***,personal attributes are not easy to obtain in most social media ***,we propose two approaches to determine personal attributes and capture personal attributes between different posts for emotion detection:the Joint Model with Personal Attention Mechanism(JPA)model is used to detect emotion and personal attributes jointly,and capture the attributes-aware words to connect similar people;the Neural Personal Discrimination(NPD)model is employed to determine the personal attributes from posts and connect the relevant posts with similar attributes for emotion *** results show the usefulness of personal attributes in emotion detection,and the effectiveness of the proposed JPA and NPD approaches in capturing personal attributes over the state-of-the-art statistic and neural models.

关键词： emotion detection adversarial network attention mechanism personal attribute

Parametric shape prior model used in image segmentation

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Journal of Systems Engineering and Electronics 2016年第5期27卷 1115-1121页

作者： zhiheng zhou ming dai huiqiang zhong College of Electronics and Information Engineering South China University of Technology Guangzhou 510640 China

Due to the frequency of occlusion, cluttering and lowcontrast edges, gray intensity based active contour models oftenfail to segment meaningful objects. Prior shape information is usuallyutilized to segment desirable objects. A parametric shape priormodel is proposed. Firstly, principal component analysis is employedto train object shape and transformation is added to shaperepresentation. Then the energy function is constructed througha combination of shape prior energy, gray intensity energy andshape constraint energy of the kernel density function. The objectboundary extraction process is converted into the parameters solvingprocess of object shape. Besides, two new shape prior energyfunctions are defined when desirable objects are occluded by otherobjects or some parts of them are missing. Finally, an alternatingdecent iteration solving scheme is proposed for numerical *** on synthetic and real images demonstratethe robustness and accuracy of the proposed method.

关键词： image segmentation shape prior principal componentanalysis kernel density function.

Low-temperature processing of LiZn-based ferrite ceramics by co-doping of V_(2)O_(5)and Sb_(2)O_(3):Composition,microstructure and magnetic properties

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Journal of Materials Science & Technology 2022年第4期99卷 1-8页

作者： Renquan Wang Tingchuan zhou Zhiyong zhong College of Materials Science and Engineering Sichuan UniversityChengdu 610065China Key Laboratory of Advanced Special Materials&Technology Ministry of EducationChengdu 610065China State Key Laboratory of Electronic Thin Films and Integrated Devices University of Electronic Science and Technology of ChinaChengdu 610054China

Low-temperature fired ferrites or ceramics are usually processed by using low-melting materials(e.g.,glasses,oxides,and eutectics)as sintering aids to obtain compact and uniform ***,a dual-strategy of co-doping with V_(2)O_(5)and Sb_(2)O_(3)oxides and forming a eutectic liquid phase has been employed to reduce the melting point of LiZn ferrite ceramics in an effective *** results indicate that miniscule amounts of V_(2)O_(5)and Sb_(2)O_(3)co-doping contribute in producing dense and uniform microstructures with enhanced magnetic performance by low-temperature *** phase structural and microstructural evolutions have been studied in *** their correlations with magnetic properties have been *** magnetic performance(B_(s)=475.4 mT,M_(s)=82.51 emu/g,B_(r)/B_(s)=0.85,H_(c)=2.2 Oe,ΔH=153.8 Oe)of the LiZn-based ferrite ceramics is achieved by optimized composition and microstructure,which shows great potential for microwave applications including phase shifters and *** importantly,such a co-doping strategy can be also extended to other material systems,like dielectric ceramics,hexagonal ferrites or piezoelectric ceramics.

关键词： Low-temperature firing Eutectic liquid phase Magnetic properties Uniform microstructure FMR line width

Novel model of material removal rate on ultrasonic-assisted chemical mechanical polishing for sapphire

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Friction 2023年第11期11卷 2073-2090页

作者： Mufang zhou Min zhong Wenhu XU Department of Mechanical Engineering Key Laboratory of TribologyNanchang UniversityNanchang 330031China

Ultrasonic-assisted chemical mechanical polishing(UA-CMP)can greatly improve the sapphire material removal and surface quality,but its polishing mechanism is still *** paper proposed a novel model of material removal rate(MRR)to explore the mechanism of sapphire *** contains two modes,namely two-body wear and ***,the atomic force microscopy(AFM)in-situ study,computational fluid dynamics(CFD)simulation,and polishing experiments were conducted to verify the model and reveal the polishing *** the AFM in-situ studies,the tip scratched the reaction layer on the sapphire *** pit with a 0.22 nm depth is the evidence of two-body *** CFD simulation showed that abrasives could be driven by the ultrasonic vibration to impact the sapphire surface at high *** maximum total velocity and the air volume fraction(AVF)in the central area increased from 0.26 to 0.55 m/s and 20%to 49%,respectively,with the rising amplitudes of 1–3μ***,the maximum total velocity rose slightly from 0.33 to 0.42 m/s,and the AVF was nearly unchanged under 40–80 r/*** indicated that the ultrasonic energy has great effects on the abrasive-impact *** UA-CMP experimental results exhibited that there was 63.7%improvement in MRR when the polishing velocities rose from 40 to 80 r/*** roughness of the polished sapphire surface was R_(a)=0.07 *** identified that the higher speed achieved greater MRR mainly through the two-body wear *** study is beneficial to further understanding the UA-CMP mechanism and promoting the development of UA-CMP technology.

关键词： sapphire ultrasonic-assisted chemical mechanical polishing(UA-CMP) material removal rate(MRR)predictive model atomic force microscopy(AFM)in-situ studies computational fluid dynamics(CFD)

Robust and efficient edge-based visual odometry

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Computational Visual Media 2022年第3期8卷 467-481页

作者： Feihu Yan Zhaoxin Li zhong zhou State Key Laboratory of Virtual Reality Technology and Systems Beihang UniversityBeijing 100191China Institute of Computing Technology Chinese Academy ofSciencesBeijing 100190China

Visual odometry,which aims to estimate relative camera motion between sequential video frames,has been widely used in the fields of augmented reality,virtual reality,and autonomous ***,it is still quite challenging for stateof-the-art approaches to handle low-texture *** this paper,we propose a robust and efficient visual odometry algorithm that directly utilizes edge pixels to track camera *** contrast to direct methods,we choose reprojection error to construct the optimization energy,which can effectively cope with illumination *** distance transform map built upon edge detection for each frame is used to improve tracking efficiency.A novel weighted edge alignment method together with sliding window optimization is proposed to further improve the *** on public datasets show that the method is comparable to stateof-the-art methods in terms of tracking accuracy,while being faster and more robust.

关键词： visual odometry(VO) edge structure distance transform low-texture