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Improving Friend Recommendation for Online Learning with Fine-Grained Evolving Interest

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Journal of Computer Science & Technology 2022年第6期37卷 1444-1463页

作者： Ming-Min Shao Wen-jun jiang Jie Wu Yu-Qing Shi Tak Shing Yum Ji Zhang College of Computer Science and Electronic Engineering Hunan UniversityChangsha 410082China Department of Computer and Information Sciences Temple UniversityPhiladelphia 19122U.S.A. School of Computer Science and Engineering Northeastern UniversityShenyang 110819China Department of Information Engineering Chinese University of Hong KongHong Kong 999077China Department of Mathematics and Computing University of Southern QueenslandBrisbaneQLD 4350Australia

Friend recommendation plays a key role in promoting user experience in online social networks(OSNs).However,existing studies usually neglect users’fine-grained interest as well as the evolving feature of interest,which may cause unsuitable *** particular,some OSNs,such as the online learning community,even have little work on friend *** this end,we strive to improve friend recommendation with fine-grained evolving interest in this *** take the online learning community as an application scenario,which is a special type of OSNs for people to learn courses *** partners can help improve learners’learning effect and improve the attractiveness of *** propose a learning partner recommendation framework based on the evolution of fine-grained learning interest(LPRF-E for short).We extract a sequence of learning interest tags that changes over ***,we explore the time feature to predict evolving learning ***,we recommend learning partners by fine-grained interest *** also refine the learning partner recommendation framework with users’social influence(denoted as LPRF-F for differentiation).Extensive experiments on two real datasets crawled from Chinese University MOOC and Douban Book validate that the proposed LPRF-E and LPRF-F models achieve a high accuracy(i.e.,approximate 50%improvements on the precision and the recall)and can recommend learning partners with high quality(e.g.,more experienced and helpful).

关键词： online social network friend recommendation fine-grained interest evolving feature tag online learning community

β-Elemene induces apoptosis and autophagy in colorectal cancer cells through regulating the ROS/AMPK/mTOR pathway

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Chinese Journal of Natural Medicines 2022年第1期20卷 9-21页

作者： WANG Guo-Yu ZHANG Lei GENG Ya-Di WANG Bin FENG Xiao-jun CHEN Zhao-Lin WEI Wei jiang Ling Department of Pharmacy the First Affiliated Hospital of USTCDivision of Life Sciences and MedicineUniversity of Science and Technology of ChinaHefeiAnhui230001China Institute of Clinical Pharmacology Anhui Medical UniversityHefei 230001China Department of Pharmacy Hefei Cancer HospitalChinese Academy of SciencesHefei 230031China

β-Elemene is an effective anti-cancer ingredient extracted from the genus Curcuma(Zingiberaceae familiy).In the present study,we demonstrated thatβ-elemene inhibited the proliferation of colorectal cancer cells and induced cell cycle arrest in the G2/M *** addition,β-elemene induced nuclear chromatin condensation and cell membrane phosphatidylserine eversion,decreased cell mitochondrial membrane potential,and promoted the cleavage of caspase-3,caspase-9 and PARP proteins,indicating apoptosis in colorectal cancer *** the same time,β-elemene induced autophagy response,and the treated cells showed autophagic vesicle bilayer membrane structure,which was accompanied by up-regulation of the expression of LC3B and ***,β-elemene increased ROS levels in colorectal cancer cells,promoted phosphorylation of AMPK protein,and inhibited mTOR protein *** the experiments in vivo,β-elemene inhibited the tumor size and induced apoptosis and autophagy in nude *** summary,β-elemene inhibited the occurrence and development of colon cancer xenografts in nude mice,and significantly induced apoptosis and autophagy in colorectal cancer cells in *** effects were associated with regulation of the ROS/AMPK/mTOR *** offered a molecular basis for the development ofβ-elemene as a promising anti-tumor drug candidate for colorectal cancer.

关键词： β-Elemene Colorectal cancer Apoptosis Autophagy AMPK mTOR

The relationship between the radio core-dominance parameter and spectral index in different classes of extragalactic radio sources(Ⅲ)

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Research in Astronomy and Astrophysics 2020年第2期20卷 101-111页

作者： Zhi-Yuan Pei jun-Hui Fan Denis Bastieri jiang-He Yang Hu-Bing Xiao Wen-Xin Yang Center for Astrophysics Guangzhou UniversityGuangzhou 510006China Astronomy Science and Technology Research Laboratory of Department of Education of Guangdong Province Guangzhou 510006China Dipartimento di Fisica e Astronomia“G.Galilei” Universita di Padova1-35131 PadovaItaly Istituto Nazionale di Fisica Nucleare Sezione di Padova1-35131 PadovaItaly Department of Physics and Electronics Science Hunan University of Arts and ScienceChangde 415000China

Active galactic nuclei(AGNs) can be divided into two major classes,namely radio-loud and radio-quiet AGNs.A small subset of the radio-loud AGNs is called blazars,which are believed to be unified with Fanaroff-Riley type Ⅰ and type Ⅱ(FRI&Ⅱ) radio *** our previous work,we present a latest sample of 966 sources with measured radio flux densities of the core and extended *** sample includes 83 BL Lacs,473 flat spectrum radio quasars,101 Seyferts,245 galaxies,52 FRIs&Ⅱs and12 unidentified *** then calculate the radio core-dominance parameters and spectral indices and study their *** analysis shows that the core-dominance parameters and spectral indices are quite different for different types of *** also confirm that the correlation between core-dominance parameter and radio spectral index extends over all the sources in a large sample presented.

关键词： galaxies:active galaxies:general galaxies:jets quasars:general

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高分辨率遥感影像土地利用及其变化检测

北京测绘 2024年第2期38卷 124-130页

作者：项超生邓良陈俊江玉杰徐立晨程飞徐敏安徽省地质测绘技术院安徽合肥230022

为探究不同分类方法在高分辨率遥感影像土地利用及变化检测中的应用,基于淮南市2017-2018年高分一号宽幅相机(GF-1WFV)数据,分别采用最大似然法和支持向量机法进行土地利用及其变化检测,分析不同分类结果的空间分布、转移矩阵、动态变化... 详细信息

为探究不同分类方法在高分辨率遥感影像土地利用及变化检测中的应用,基于淮南市2017-2018年高分一号宽幅相机(GF-1WFV)数据,分别采用最大似然法和支持向量机法进行土地利用及其变化检测,分析不同分类结果的空间分布、转移矩阵、动态变化,根据其分类精度,最后比较它们的优缺点。结果表明:两种分类方法的林地、耕地、水体和人工建筑分类总体精度均在98%以上,Kappa系数在97%以上,具有较高的分类精度。2017-2018年林地和建筑面积有所增加,其中林地的增加较为稳定,人工建筑的转入和转出百分比都比较高,耕地的变化在不同的分类方法下显示都是明显减少,水体的变化在使用最大似然法分类时是增加的,而使用支持向量机法分类时是减少的。因此,不同分类方法所得到的结果受特定数据集、数据预处理、特征选取、参数选择等因素的影响而存在差异。

关键词：高分辨率遥感土地利用变化检测最大似然支持向量机

RASAL2 Deficiency Attenuates Hepatic Steatosis by Promoting Hepatic VLDL Secretion via the AKT/TET1/MTTP Axis

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Journal of Clinical and Translational Hepatology 2023年第2期11卷 261-272页

作者： Hao Ding jiang-Hong Yu Ge Ge Yan-Yun Ma Jiu-Cun Wang jun Zhang Jie Liu Department of Digestive Diseases Huashan HospitalFudan UniversityShanghaiChina Institutes of Biomedical Sciences Fudan UniversityShanghaiChina Department of Dermatology The Seventh Medical Center of PLA General HospitalBeijingChina Human Phenome Institute Fudan UniversityShanghaiChina Ministry of Education Key Laboratory of Contemporary Anthropology and State Key Laboratory of Genetic Engineering School of Life SciencesFudan UniversityShanghaiChina Six-sector Industrial Research Institute Fudan UniversityShanghaiChina

Background and Aims:RAS protein activator like 2(RASAL2)is a newly discovered metabolic regulator involved in energy homeostasis and ***,whether RASAL2 is involved in hepatic lipid metabolism remains *** study explored the function of RASAL2 and elucidated its potential mechanisms in nonalcoholic fatty liver disease(NAFLD).Methods:NAFLD models were established either by feeding mice a high-fat diet or by incubation of hepatocytes with 1 mM free fatty acids(oleic acid:palmitic acid=2:1).Pathological changes were observed by hematoxylin and eosin *** accumulation was assessed by Oil Red O staining,BODIPY493/503 staining,and triglyceride *** in vivo secretion rate of very lowdensity lipoprotein was determined by intravenous injection of *** regulation was analyzed by chromatin immunoprecipitation assays and hydroxymethylated DNA immunoprecipitation combined with real-time polymerase chain ***:RASAL2 deficiency ameliorated hepatic steatosis both in vivo and in ***,RASAL2 deficiency upregulated hepatic TET1 expression by activating the AKT signaling pathway and thereby promoted MTTP expression by DNA hydroxymethylation,leading to increased production and secretion of very low-density lipoprotein,which is the major carrier of triglycerides exported from the liver to distal ***:Our study reports the first evidence that RASAL2 deficiency ameliorates hepatic steatosis by regulating lipid metabolism through the AKT/TET1/MTTP *** findings will help understand the pathogenesis of NAFLD and highlight the potency of RASAL2 as a new molecular target for NAFLD.

关键词： Nonalcoholic fatty liver disease RASAL2 Very low-density lipoprotein Steatosis Lipid metabolism

Synergistic roles of platinum nanoparticles and sodium ions within beta zeolites in N-alkylation of amines with aromatic alcohols

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中国科学:化学英文版 2023年第9期66卷 2690-2699页

作者： Yue Wu Shibo Xi Cailing Chen Qizhi Hu Zhuo Xiong Jianyue Wang Yihu Dai Yu Han Shi jiang jun Wang Yu Zhou State Key Laboratory of Materials-Oriented Chemical Engineering College of Chemical EngineeringNanjing Tech UniversityNanjing 211816China Institute of Sustainability for Chemicals Energy and EnvironmentA*STAR(Agency for ScienceTechnology and Research)Singapore 627833Singapore Advanced Membranes and Porous Materials Center Physical Sciences and Engineering DivisionKing Abdullah University of Science and TechnologyThuwal 23955-6900Saudi Arabia Institute of Advanced Synthesis School of Chemistry and Molecular EngineeringNanjing Tech UniversityNanjing 211816China

N-alkylation of amines with alcohols is a promising green route for the synthesis of N-alkylamines, but the designation of highly active and stable heterogeneous catalysts remains one challenge. In this work, we initiated the application of zeolite-encapsulated noble metal nanoparticles(NPs) in the N-alkylation of amines with aromatic alcohols. Platinum(Pt) NPs were directly confined into the framework of BEA zeolite with tunable Si/Al molar ratios and Na^(+) contents. The champion catalyst afforded the extremely high turnover number(TON) of 6,176 and turnover frequency(TOF) of 3,390 h^(-1) plus stable recyclability and broad substrate compatibility. The Na ions modulated the electronic state of Pt NPs to reach a moderate Pt–H strength, which wellbalanced the two crucial steps of dehydrogenation and H-transfer and accounted for the high catalytic performance. The encapsulation of zeolites provided spatial satisfaction for the synergy effect above and enhanced the stabilization of Pt NPs.

关键词： heterogeneous catalysis zeolite amines N-alkylation nano catalysts

2205/Q420/2205蛇形轧制复合变形规律研究

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太原科技大学学报 2024年第3期45卷 229-235页

作者：杨超赵海峰乔福振王利军江连运太原科技大学机械工程学院太原030024 山东钢铁集团日照有限公司中厚板厂山东日照276800

为研究三层不锈钢复合板在不同工艺参数下轧制复合的变形规律,采用ANSYS有限元软件模拟了2205/Q420/2205三层复合板轧制复合过程,研究了同步轧制、同速异径轧制和同速异径蛇形轧制三种不同工艺下,复合板结合界面等效塑性应变和弯曲曲率... 详细信息

为研究三层不锈钢复合板在不同工艺参数下轧制复合的变形规律,采用ANSYS有限元软件模拟了2205/Q420/2205三层复合板轧制复合过程,研究了同步轧制、同速异径轧制和同速异径蛇形轧制三种不同工艺下,复合板结合界面等效塑性应变和弯曲曲率的变化规律,分析了不同压下率、初始厚度比和错位量对轧后板形的影响规律,并进行了轧制复合实验。研究结果表明,蛇形轧制通过调整错位量,能有效提高轧后板材界面结合强度并降低轧后弯曲。轧后弯曲曲率随着压下率的增大呈现出先减小后增大的趋势。等效塑性应变随着错位量的增加先增大后减小,轧后弯曲曲率随着错位量的增加逐渐降低,这表明通过适当调整错位量可以使轧后板材同时达到优良的结合强度和平直度。

关键词：蛇形轧制有限元等效塑性应变弯曲曲率

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面向SaaS的零信任技术研究

电信工程技术与标准化 2024年第3期37卷 1-6页

作者：江为强陈琳刘利军柏洪涛王光涛中国移动通信集团有限公司北京100033 中移物联网有限公司重庆401121

为解决云计算环境下SaaS对数据进行有效访问控制的安全需求,本文引入零信任技术“永不信任,持续验证”的理念,提出基于零信任的身份认证与访问控制技术和基于零信任网络的软件定义边界解决方案,以实现更细粒度和动态的访问控制,减少潜... 详细信息

为解决云计算环境下SaaS对数据进行有效访问控制的安全需求,本文引入零信任技术“永不信任,持续验证”的理念,提出基于零信任的身份认证与访问控制技术和基于零信任网络的软件定义边界解决方案,以实现更细粒度和动态的访问控制,减少潜在远程连接的横向攻击风险。本文旨在通过对面向SaaS的零信任技术的研究,为组织和企业提供更安全和可靠的SaaS环境,有效降低数据泄露和安全风险,提高企业对SaaS的信任和采用度。

关键词： SaaS SaaS安全零信任技术身份验证访问控制

Amidoxime-based adsorbents prepared by cografting acrylic acid with acrylonitrile onto HDPE fiber for the recovery of uranium from seawater

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Nuclear Science and Techniques 2017年第4期28卷 13-18页

作者： Lu Xu jiang-Tao Hu Hong-Juan Ma Chang-Jian Ling Mou-Hua Wang Rong-Fang Shen Xiao-Jing Guo Yin-ning Wang Jing-Ye Li Guo-Zhong Wu Shanghai Institute of Applied Physics Chinese Academy of Sciences Nuclear and Radiation Safety Center Ministry of Environmental Protection of the People's Republic of China

An amidoxime-based polymeric adsorbent was prepared by pre-irradiation grafting of acrylonitrile and acrylic acid onto high-density polyethylene fibers using electron beams,followed by *** recovery of uranium was investigated by flow-through experiment using simulated seawater and marine test in natural *** maximum amount of uranium uptake was 2.51 mg/g-ads after 42 days of contact with simulated seawater and 0.13 mg/g-ads for 15 days of contact with natural seawater.A lower uranium uptake in marine test can be attributed to the short adsorption time and the contamination of marine microorganisms and ***,the high selectivity toward uranium against vanadium may be beneficial to harvest uranyl ion onto adsorbents and the economic feasibility for recovery of uranium from seawater.

关键词： Radiation-induced grafting Amidoxime Acrylonitrile Uranium Selectivity