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IEA: an answerer recommendation approach on stack overflow

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Science China(Information Sciences) 2019年第11期62卷 51-69页

作者： liting wang Li ZHANG Jing JIANG State Key Laboratory of Software Development Environment Beihang University

Stack overflow is a web-based service where users can seek information by asking questions and share knowledge by providing answers about software development. Ideally, new questions are assigned to experts and answered within a short time after their submissions. However, the number of new questions is very large on stack overflow, answerers are not easy to find suitable questions timely. Therefore, an answerer recommendation approach is required to assign appropriate questions to answerers. In this paper, we make an empirical study about developers' activities. Empirical results show that 66.24% of users have more than30% of comment activities. Furthermore, active users in the previous day are likely to be active in the next day. In this paper, we propose an approach IEA which combines user topical interest, topical expertise and activeness to recommend answerers for new questions. We first model user topical interest and expertise based on historical questions and answers. We also build a calculation method of users' activeness based on historical questions, answers, and comments. We evaluate the performance of IEA on 3428 users containing41950 questions, 64894 answers, and 96960 comments. In comparison with the state-of-the-art approaches of TEM, TTEA and TTEA-ACT, IEA improves n DCG by 2.48%, 3.45% and 3.79%, and improves Pearson rank correlation coefficient by 236.20%, 84.91% and 224.12%, and improves Kendall rank correlation coefficient by 424.18%, 1845.30% and 772.60%.

关键词： answerer recommendation activeness comments topical interest topical expertise stack overflow

Summary of research on recommendation system based on serendipity

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The Journal of China Universities of Posts and Telecommunications 2022年第4期29卷 89-105页

作者： Meng Wei wang liting LüMeng School of Information Science and Technology Beijing Forestry UniversityBeijing 100083China Engineering Research Center for Forestry-oriented Intelligent Information Processing National Forestry and Grassland AdministrationBeijing 100083China

Personalized recommender systems provide various personalized recommendations for different users through the analysis of their respective historical ***,the problem of the“filter bubble”which has to do with over-specialization ***(SRDP),one of the evaluation indicators,can provide users with unexpected and useful recommendations,and help to successfully mitigate the filter bubble problem,and enhance users’satisfaction levels and provide them with diverse *** SRDP is highly subjective and challenging to study,only a few studies have focused on it in recent *** this study,the research results on SRDP were summarized,the various definitions of SRDP and its applications were discussed,the specific SRDP calculation process from qualitative to quantitative perspectives was presented,the challenges and the development directions were outlined to provide a framework for further research.

关键词： serendipity recommended algorithm recommended diversity filter bubbles evaluation indicators

吡虫啉与5种植物源农药复配对月季长管蚜的联合作用及田间药效

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农药 2025年第2期64卷 146-150页

作者：刘薪薪张玉军王莉婷郭风民郑州市城市园林科学研究所郑州450051

[目的]减少化学农药的使用量,延缓月季蚜虫的抗药性,实现化学农药的减量增效。[方法]通过室内生物活性测定吡虫啉与5种植物源农药复配对月季蚜虫的联合作用,结合田间药效试验筛选最佳减量配施组合。[结果]5种植物源农药对月季长管蚜室... 详细信息

[目的]减少化学农药的使用量,延缓月季蚜虫的抗药性,实现化学农药的减量增效。[方法]通过室内生物活性测定吡虫啉与5种植物源农药复配对月季蚜虫的联合作用,结合田间药效试验筛选最佳减量配施组合。[结果]5种植物源农药对月季长管蚜室内生物活性均高于吡虫啉;当吡虫啉和印楝素、藜芦根茎提取物分别以有效成分比7∶2、14∶5复配时对月季蚜虫联合增效作用显著,联合作用系数分别为221.85和141.31,药后14 d对月季蚜虫防效仍达80%以上,显著高于吡虫啉。[结论]初期可考虑使用印楝素或藜芦根茎提取物单剂对月季蚜虫进行预防,在蚜虫暴发期推荐将吡虫啉与印楝素7∶2复配或者与藜芦根茎提取物14∶5复配交替使用。

关键词：月季长管蚜吡虫啉植物源农药农药复配联合作用田间药效

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Applications of flexible electrochemical electrodes in wastewater treatment:A review

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Chinese Chemical Letters 2024年第8期35卷 84-92页

作者： Jiqing Liu Qi Dang liting wang Dejin wang Liang Tang Key Laboratory of Organic Compound Pollution Control Engineering(MOE) School of Environmental and Chemical EngineeringShanghai UniversityShanghai 200444China School of Resources and Environment Anqing Normal UniversityAnqing 246011China

The advancement of energy storage technology has paved the way for the application of electrochemi-cal processes in achieving low-carbon and precise environmental pollution *** play a crucial role in efficiently removing organic pollutants and heavy *** implement electrochemical pollution control technology in practical engineering,flexible electrode preparation is *** review highlights recent progress in flexible electrode research,focusing on the selection and structural design of flexible electrode *** summarizes the latest advancements in current collectors,active mate-rials,and preparation methods to enhance conductivity,flexibility,and cycle *** application of flexible electrodes in water pollution control is categorized into three aspects:Organic pollutants,inor-ganic pollutants,and composite ***,the challenges and research requirements for enhanc-ing electrode flexibility in environmental governance are discussed,along with prospects for their future applications.

关键词： Flexible electrode Wastewater treatment Photoanode Removal effect Emerging contaminants

Liquid metal corrosion sculpture to fabricate quickly complex patterns on aluminum

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Science China(Technological Sciences) 2017年第1期60卷 65-70页

作者： LU JinRong YI liting wang Lei TAN SiCong GUI Han LIU Jing Department of Biomedical Engineering School of Medicine Tsinghua University Beijing 100084 China

A liquid metal enabled corrosion sculpture technique for quickly fabricating complex pattems on aluminum substrate is proposed and experimentally demonstrated. According to the conceptual investigation, it is clarified that the width and the depth of a printed track are dominated by sculpture time and working temperature. The printed size can reach small values of 38 μm through controlling the sculpture time for 60 s. As the sculpture time was increased from 5 to 25 rain at 20℃, the depth of the fabricated pattern was improved from 13.3 to 25.6 μm. The sculptured depth of the pattern would increase from 13.3 to 106.9 μm when the sculpture time was fixed at 5 min and the temperature was raised from 20 to 60℃. To investigate the sculpture behavior in detail, the phases and microstructure of sculpture surface were quantitatively measured via a group of microscope imaging system with fundamental mechanisms interpreted. The present liquid metal sculpture method on aluminum substrate adds a new valuable soft tool for current metal engraving technology family.

关键词： sculpture printing corrosion liquid metal aluminum substrate soft fabrication

Iron-Catalyzed Oxidative Deconstruction of Polyethylene Terephthalate to Terephthalic Acid under O_(2)

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Chinese Journal of Chemistry 2024年第20期42卷 2431-2437页

作者： Sichang wang liting wang Ting Xue Guoxiang Zhang Congyu Ke Rong Zeng Ccollege of Chemistry and Chemical Engineering Xi'an Shiyou UniversityXianShaanxi 710065China School of Chemistry Xi'an Jiaotong UniversityXi'anShaanxi 710049China

It is urgent to recycle polyethylene terephthalate(PET)effectively,since it is the most consumed synthetic polyester and its improper disposal has caused significant environmental *** existing chemical recycling methods highly rely on the nucleophilic substitutions and hydrogenative depolymerizations,which typically require the use of excess of nucleophiles,excess strong acids or bases,expensive metal catalysts,and explosive gas ***,we demonstrate a mild and efficient protocol for oxidative depolymerization of PET to terephthalic acid using only an O2 *** acid can be recycled from PET-containing materials including a series of plastic products in daily *** employing of relatively low loading of iron complex,the most earth-abundant transition metal,as the catalyst and the preliminary results on the large-scale reaction using 38 g of PET waste demonstrate the practical feasibility of this degradation *** method can be also applicable for selective degradation of PET from mixed *** work represents a rare example of a selective oxidative depolymerization and demonstrates the great potentials of such a concept in polyester recycling.

关键词： Iron catalysis PET deconstruction Photocatalysis IOxidation Radical reactions Degradation Plastics

The Walsh Transform of a Class of Boolean Functions

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Wuhan University Journal of Natural Sciences 2021年第6期26卷 453-458页

作者： JIANG Niu ZHUO Zepeng CHEN Guolong wang liting School of Mathematical Sciences Huaibei Normal UniversityHuaibei 235000AnhuiChina School of Cyber Science University of Science and Technology of ChinaHefei 230027AnhuiChina School of Computer Engineering Bengbu UniversityBengbu 233030AnhuiChina

The Walsh transform is an important tool to investigate cryptographic properties of Boolean *** paper is devoted to study the Walsh transform of a class of Boolean functions defined as g(x)=f(x)Tr^(n)_(1)(x)+h(x)Tr^(n)_(1)(δx),by making use of the known conclusions of Walsh transform and the properties of trace function,and the conclusion is obtained by generalizing an existing result.

关键词： Boolean function Walsh transform trace function

The effect of pore size and porosity of Ti6Al4V scaffolds on MC3T3-E1 cells and tissue in rabbits

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Science China(Technological Sciences) 2019年第7期62卷 1160-1168页

作者： LUAN HuiQin wang liting REN WeiYan CHU Zhao Wei HUANG YunFei LU ChengLin FAN YuBo Key Laboratory of Intelligent Control and Rehabilitation Technology of the Ministry of Civil Affairs National Research Center for Rehabilitation Technical Aids Beijing 100176 China Beijing Key Laboratory of Rehabilitation Technical Aids for Old-Age Disability Beijing 100176 China Key Laboratory for Biomechanics and Mechanobiology of Ministry of Education School of Biological Science and Medical Engineering Beihang University Beijing 100191 China Shandong Weigao Orthopedic Device Company Limited Weihai 264209 China

Electron beam melting(EBM) allows the fabrication of specific porous titanium implants, whereas their in vitro and in vivo biological performance should be further investigated. In this study, we examined the porous Ti6 Al4 V scaffolds(low, 334.1 μm pore size with 55.4% porosity;middle, 383.2 μm pore size with 65.2% porosity;and high, 401.6 μm pore size with 78.1%porosity) fabricated through EBM. The structural characterization and mechanical properties of porous Ti6 Al4 V scaffolds were measured through micro-computed tomography(micro-CT), scanning electron microscopy, and a material testing ***3 T3-E1 cells were used to assess the proliferation and differentiation of the cells on different scaffolds at day 7 and day 14 based on the expression levels of genes, including alkaline phosphatase, bone morphogenetic protein-2, osteopontin and runtrelated transcription factor-2. Rabbits with distal femoral defects were utilized to evaluate bone ingrowth in the porous *** of the samples were subjected to micro-CT and histological analysis after 12 weeks. Results showed that compressive Young’s modulus of 0.3–1.1 GPa was similar to the trabecular bone. The three types of porous Ti6 Al4 V scaffolds were inclined to promote cell proliferation, whereas cell differentiation and bone ingrowth into the porous scaffolds were biased to the porous titanium with relatively large pores and porosity(middle and high). This study implied that the present porous implant design,which had the combined advantages of different pore sizes and porosity, might be meaningful and promising for trabecular bone defect restoration.

关键词： pore size porosity porous titanium alloy scaffolds osteogenesis bone defect

基于ResNet-18的燃气发电机组故障声音识别技术研究

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自动化应用 2025年第2期66卷 40-44,49页

作者：李奇杨春雨王立婷陈洪刚中国矿业大学信息与控制工程学院江苏徐州221116 淄博淄柴新能源有限公司山东淄博255000

提出一种燃气发电机组故障声音识别技术,首先对麦克风实时采集的声音信号进行时频域分析,生成时频图,然后利用训练过的ResNet-18卷积神经网络对时频图进行分类,判断其属于正常、嘈杂、不稳定、敲击这4种状态中的哪种。其实时性强,可用... 详细信息

提出一种燃气发电机组故障声音识别技术,首先对麦克风实时采集的声音信号进行时频域分析,生成时频图,然后利用训练过的ResNet-18卷积神经网络对时频图进行分类,判断其属于正常、嘈杂、不稳定、敲击这4种状态中的哪种。其实时性强,可用于实现在线的报警保护。

关键词： ResNet-18 卷积神经网络燃气发电机故障声音识别