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Proximal Alternating-Direction-Method-of-Multipliers-Incorporated Nonnegative Latent Factor Analysis

IEEE/CAA Journal of Automatica Sinica 2023年第6期10卷 1388-1406页

作者： Fanghui Bi xin luo Bo Shen Hongli Dong Zidong Wang the Chongqing Institute of Green and Intelligent Technology Chinese Academy of Sciencesand also with the Chongqing SchoolUniversity of Chinese Academy of SciencesChongqing 400714China the College of Computer and Information Science Southwest UniversityChongqing 400715China the College of Information Science and Technology Donghua UniversityShanghai 201620China the Artificial Intelligence Energy Research Institute Northeast Petroleum UniversityDaqing 163318China the Department of Computer Science Brunel University LondonUxbridge UB83PHUnited Kingdom

High-dimensional and incomplete(HDI)data subject to the nonnegativity constraints are commonly encountered in a big data-related application concerning the interactions among numerous nodes.A nonnegative latent factor analysis(NLFA)model can perform representation learning to HDI data ***,existing NLFA models suffer from either slow convergence rate or representation accuracy *** address this issue,this paper proposes a proximal alternating-directionmethod-of-multipliers-based nonnegative latent factor analysis(PAN)model with two-fold ideas:(1)adopting the principle of alternating-direction-method-of-multipliers to implement an efficient learning scheme for fast convergence and high computational efficiency;and(2)incorporating the proximal regularization into the learning scheme to suppress the optimization fluctuation for high representation learning accuracy to HDI *** studies verify that PAN converges to a Karush-KuhnTucker(KKT)stationary point of its nonnegativity-constrained learning objective with its learning *** results on eight HDI matrices from real applications demonstrate that the proposed PAN model outperforms several state-of-the-art models in both estimation accuracy for missing data of an HDI matrix and computational efficiency.

关键词： nonnegative representation convergence

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Efficient and High-quality Recommendations via Momentum-incorporated Parallel Stochastic Gradient Descent-Based Learning

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IEEE/CAA Journal of Automatica Sinica 2021年第2期8卷 402-411页

作者： xin luo Wen Qin Ani Dong Khaled Sedraoui MengChu Zhou the School of Computer Science and Technology Dongguan University of TechnologyDongguan 523808 Hengrui(Chongqing)Artificial Intelligence Research Center Department of Big Data Analyses TechniquesCloudwalkChongqing 401331China the School of Computer Science and Technology Chongqing University of Posts and TelecommunicationsChongqing 400065 Chongqing Engineering Research Center of Big Data Application for Smart Cities Chongqing Institute of Green and Intelligent TechnologyChinese Academy of SciencesChongqing 400714China the Department of Computer and Information Science City College of Dongguan University of TechnologyDongguan 523419China the Department of Electrical and Computer Engineering Faculty of Engineeringand Center of Research Excellence in Renewable Energy and Power SystemsKing Abdulaziz UniversityJeddah 21481Saudi Arabia the Department of Electrical and Computer Engineering New Jersey Institute of TechnologyNewarkNJ 07102 USA the Center of Research Excellence in Renewable Energy and Power Systems King Abdulaziz UniversityJeddah 21481Saudi Arabia

A recommender system(RS)relying on latent factor analysis usually adopts stochastic gradient descent(SGD)as its learning ***,owing to its serial mechanism,an SGD algorithm suffers from low efficiency and scalability when handling large-scale industrial *** at addressing this issue,this study proposes a momentum-incorporated parallel stochastic gradient descent(MPSGD)algorithm,whose main idea is two-fold:a)implementing parallelization via a novel datasplitting strategy,and b)accelerating convergence rate by integrating momentum effects into its training *** it,an MPSGD-based latent factor(MLF)model is achieved,which is capable of performing efficient and high-quality *** results on four high-dimensional and sparse matrices generated by industrial RS indicate that owing to an MPSGD algorithm,an MLF model outperforms the existing state-of-the-art ones in both computational efficiency and scalability.

关键词： Big data industrial application industrial data latent factor analysis machine learning parallel algorithm recommender system(RS) stochastic gradient descent(SGD)

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Gauss Sum of Index 4:(1)Cyclic Case

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Acta Mathematica Sinica,English Series 2005年第6期21卷 1425-1434页

作者： Ke Qin FENG Jing YANG Shi xin luo Department of Mathematical Science Tsinghua University Beijing 100084 P. R. China

Let p be a prime, m ≥ 2, and （m,p（p - 1）） = 1. In this paper, we will calculate explicitly the Gauss sum G（X） = ∑x∈F＊qX（x）ζ^Tp^（x） in the case of [（Z/mZ）＊：（p）] = 4, and -1 （不属于）（p）, wher... 详细信息

Let p be a prime, m ≥ 2, and （m,p（p - 1）） = 1. In this paper, we will calculate explicitly the Gauss sum G（X） = ∑x∈F＊qX（x）ζ^Tp^（x） in the case of [（Z/mZ）＊：（p）] = 4, and -1 （不属于）（p）, where q P^f, f =φ（m）/4, X is a multiplicative character of Fq with order m, and T is the trace map for Fq/Fp. Under the assumptions [（Z/mZ）＊：（p）] = 4 and 1（不属于）（p）, the decomposition field of p in the cyclotomic field Q（ζm） is an imaginary quartic （abelian） field. And G（X） is an integer in K. We deal with the case where K is cyclic in this oaDer and leave the non-cvclic case to the next paper.

关键词： Gauss sum Stickelberger theorem Davenport-Hasse formula cyclic quartic number field

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On the Asymptotically PT-1 Spaces

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Acta Mathematica Sinica,English Series 2017年第10期33卷 1421-1430页

作者： xin luo Ying Qing XIAO Yue Ping JIANG College of Mathematics and Econometrics Hu'nan University Changsha 410082 P. R. China

In this note, first, we show that the asymptotic subcone, the ultralimit, the completion of an asymptotically PT-1 space are still an asymptotically PT-1 space. Secondly, we consider two kinds of metric spaces, which have been considered by Ibragimov and Gromov, respectively. We show that they are asymptotically PT-1 spaces under particular conditions, which provide some concrete examples of asymptotically PT

关键词： Gromov hyperbolic space asymptotically PT-i space Ptolemy space asymptotic sub-cone

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The PCA3 test for guiding repeat biopsy of prostate cancer and its cut-off score： a systematic review and meta-analysis

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Asian Journal of Andrology 2014年第3期16卷 487-492页

作者： Yong luo xin Gou Peng Huang Chan Mou The First Affiliated Hospital of Chongqing Medical University Chongqing China

The specificity of prostate-specific antigen （PSA） for early intervention in repeat biopsy is unsatisfactory. Prostate cancer antigen 3 （PCA3） may be more accurate in outcome prediction than other methods for the early detection of prostate cancer （PCa）. However, the results were inconsistent in repeated biopsies. Therefore, we performed a systematic review and meta-analysis to evaluate the role of PCA3 in outcome prediction. A systematic bibliographic search was conducted for articles published before April 2013, using PubMed, Medline, Web of Science, Embase and other databases from health technology assessment agencies. The quality of the studies was assessed on the basis of QUADAS criteria. Eleven studies of diagnostic tests with moderate to high quality were selected. A meta-analysis was carried out to synthesize the results. The results of the meta-analyses were heterogeneous among studies. We performed a subgroup analysis （with or without inclusion of high-grade prostatic intraepithelial neoplasia （HGPIN） and atypical small acinar proliferation （ASAP））. Using a PCA3 cutoff of 20 or 35, in the two sub-groups, the global sensitivity values were 0.93 or 0.80 and 0.79 or 0.75, specificities were 0.65 or 0.44 and 0.78 or 0.70, positive likelihood ratios were 1.86 or 1.58 and 2.49 or 1.78, negative likelihood ratios were 0.81 or 0.43 and 0.91 or 0.82 and diagnostic odd ratios （ORs） were 5.73 or 3.45 and 7.13 or 4.11, respectively. The areas under the curve （AUCs） of the summary receiver operating characteristic curve were 0.85 or 0.72 and 0.81 or 0.69, respectively. PCA3 can be used for repeat biopsy of the prostate to improve accuracy of PCa detection. Unnecessary biopsies can be avoided by using a PCa cutoff score of 20.

关键词： meta-analysis PCA3 prostate cancer repeat biopsy systematic review

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Protecting and Scaffolding:How Parents Facilitate Children's Activities in Public Space in Urban China

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ECNU Review of Education 2022年第2期5卷 242-257页

作者： xin luo Shaanxi Normal University

Purpose:During the past decades,China has seen a rapid urbanization that has(re)shaped not only its city landscape but also(re)created public space where children live,play,and ***,litle research has focused on how urban public space influences young children's learning and development and how parents navigate children's development in the public ***,this research aims to study how public space influences parents'engagement with their young ***/Approach/Methods:This study is informed of Bronfenbrenner's Processes,Person,Context,and Time(PPCT)model that sees children's learning as complex and multilateral interactions among various stakeholders including schools,families,and *** employed ethnographic approach to study the interactions between children and their parents in a public playground in a Western Chinese ***:It found that parents realized public space had been reshaped by *** they accompanied their children to play,they actively monitored children's safety and cultivated children's physical and social *** this process,male parents tended to contribute more than they would do in other ***/Value:This study fills the gap by providing a nuanced study exploring how parents fulfill their responsibilities in an integral space of children's development,which has rarely been explored.

关键词： Children's learning China parental involvement public space urbanization

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Gauss Sum of Index 4:(2)Non-cyclic Case

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Acta Mathematica Sinica,English Series 2006年第3期22卷 833-844页

作者： Jing YANG Shi xin luo Ke Qin FENG Department of Mathematical Science Tsinghua University

Assume that m ≥ 2, p is a prime number, （m,p（p - 1）） = 1,-1 not belong to 〈p〉 belong to （Z/mZ）^＊ and [（Z/mZ）^＊：〈p〉]=*** this paper, we calculate the value of Gauss sum G（X）=∑x∈F^＊x（x）ζp^T（x） over Fq,where q=p^f,f=φ（m）/4,x is a multiplicative character of Fq and T is the trace map from Fq to *** our assumptions,G（x） belongs to the decomposition field K of p in Q（ζm） and K is an imaginary quartic abelian unmber *** the Galois group Gal（K/Q） is cyclic,we have studied this cyclic case in anotyer paper：＂Gauss sums of index four：（1）cyclic case＂（accepted by Acta Mathematica Sinica,2003）.In this paper we deal with the non-cyclic case.

关键词： Gauss sum Stickelberger Theorem Davenport-Hawse formula class number of imaginary quadratic field

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Disk Stability of the Milky Way Near the Sun

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Chinese Physics Letters 1999年第12期16卷 931-933页

作者： luo xin-lian PENG Qiu-he Department of Astronomy Nanjing UniversityNanjing 210093 Chinese Academy of Sciences-Peking University Joint Beijing Astrophysical Center Beijing UniversityBeijing 100871

By solving Poisson's equation for logarithmic density disturbance in three-dimensional (3D) spiral galaxies, the disturbed potential can be given on the disk. Combining it with the corresponding dispersion relation, the local gravitational stability of our galaxy is discussed here. We have generalized the Toomre's stability criterion to the more realistic 3D galaxy models. The generalized Toomre's parameter Q near the sun is 2.08 or 2.20 for two or four armed spiral galaxy models, respectively.

关键词： stability criterion disturbed

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Reversible electrochemistry of DNA on multi-walled carbon nanotube modified electrode

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Chinese Chemical Letters 2007年第7期18卷 861-864页

作者： Hong Xia luo Zhi xin Guo Nan He Department of Chemistry Renmin University of China Beijing 100872 China

Calf thymus DNA was electrochemically oxidized at a multi-walled carbon nanotube modified electrode. The potentials for DNA oxidation at pH 7.0 were 0.71 and 0.81 V versus SCE, corresponding to the oxidation of guanine and adenine residues,respectively. The initial 6e-oxidation of adenine, observed in the first scan, resulted a quasi-reversible 2e-redox process of the oxidation product in the following scans.

关键词： Carbon nanotube DNA Cyclic voltammetry Reversible

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Turbidity-adaptive underwater image enhancement method using image fusion

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Frontiers of Mechanical Engineering 2022年第3期17卷 261-279页

作者： Bin HAN Hao WANG xin luo Chengyuan LIANG xin YANG Shuang LIU Yicheng LIN School of Mechanical Science and Engineering Huazhong University of Science and TechnologyWuhan430074China Guangdong Intelligent Robotics Institute Dongguan523808China

Clear,correct imaging is a prerequisite for underwater *** real freshwater environment including rivers and lakes,the water bodies are usually turbid and dynamic,which brings extra troubles to quality of imaging due to color deviation and suspended *** of the existing underwater imaging methods focus on relatively clear underwater environment,it is uncertain that if those methods can work well in turbid and dynamic underwater *** this paper,we propose a turbidity-adaptive underwater image enhancement *** deal with attenuation and scattering of varying degree,the turbidity is detected by the histogram of *** on the detection result,different image enhancement strategies are designed to deal with the problem of color deviation and *** proposed method is verified by an underwater image dataset captured in real underwater *** result is evaluated by image metrics including structure similarity index measure,underwater color image quality evaluation metric,and speeded-up robust *** results exhibit that the method can correct the color deviation and improve the quality of underwater images.

关键词： turbidity underwater image enhancement image fusion underwater robots visibility

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