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An Improved Hybrid Collaborative Filtering Algorithm Based on Tags and Time Factor

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Big Data Mining and Analytics 2018年第2期1卷 128-136页

作者： Chunxia Zhang Ming yang Jing lv Wanqi yang the School of Computer Science and Technology Nanjing Normal University

The Collaborative Filtering(CF) recommendation algorithm, one of the most popular algorithms in Recommendation Systems(RS), mainly includes memory-based and model-based methods. When performing rating prediction using a memory-based method, the approach used to measure the similarity between users or items can significantly influence the recommendation performance. Traditional CFs suffer from data sparsity when making recommendations based on a rating matrix, and cannot effectively capture changes in user interest. In this paper, we propose an improved hybrid collaborative filtering algorithm based on tags and a time factor(TTHybridCF), which fully utilizes tag information that characterizes users and items. This algorithm utilizes both tag and rating information to calculate the similarity between users or items. In addition, we introduce a time weighting factor to measure user interest, which changes over time. Our experimental results show that our method alleviates the sparsity problem and demonstrates promising prediction accuracy.

关键词： recommendation system similarity tag time factor

A Camouflaged Film Imitating the Chameleon Skin with Color-Changing Microfluidic Systems Based on the Color Information Identification of Background

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Journal of Bionic Engineering 2021年第5期18卷 1137-1146页

作者： Huanhuan Li Tianhang yang Lujia Li Sining lv Songjing Li Department of Fluid Control and Automation Harbin Institute of TechnologyScience ParkNo.2Yikuang Street Nangang DistrictBox 3040Harbin 150001China

To adapt to a complex and variable environment,self-adaptive camouflage technology is becoming more and more important in all kinds of military applications by overcoming the weakness of the static *** nature,the chameleon can achieve self-adaptive camouflage by changing its skin color in real time with the change of the background *** imitate the chameleon skin,a camouflaged film controlled by a color-changing microfluidic system is proposed in this *** film with microfluidic channels fabricated by soft materials can achieve dynamic cloaking and camouflage by circulating color liquids through channels inside the *** sensing and collecting environmental color change information,the control signal of the microfluidic system can be adjusted in real time to imitate chameleon *** microstructure of the film and the working principle of the microfluidic color-changing system are *** mechanism to generate the control signal by information processing of background colors is illustrated.“Canny”double-threshold edge detection algorithm and color similarity are used to analyze and evaluate the *** tested results show that camouflaged images have a relatively high compatibility with environmental backgrounds and the dynamic cloaking eff ect can be achieved.

关键词： Microfluidic Self-adaptive Camouflage Chameleon Bionic skin

Preparation and characterization of Cu2ZnSn(S,Se)4 film by drop-coating of Cu2ZnSnS4 nanoink

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Rare Metals 2016年第9期35卷 718-722页

作者： Xiao-Gong lv Jing-Yu Wang Cheng-Jun Zhu zhi-Ping Wang Key Laboratory of Semiconductor Photovoltaic Technology of Inner Mongolia Autonomous Region School of Physical Science and TechnologyInner Mongolia UniversityHohhot 010021China Ordos Institute of Technology Ordos 017000China

In this work,a simple and facile one-pot oleylamine solvothermal synthetic method was developed to synthesize Cu2ZnSnS4（CZTS） *** the Cu2ZnSn（S,Se）4（CZTSSe） thin films were prepared by selenizing CZTS *** obtained CZTS nanocrystals and CZTSSe films were studied using X-ray diffraction（XRD）,transmission electron microscopy（TEM）,scanning electron microscopy（SEM）,energy-dispersive X-ray spectroscopy（EDX）,and ultraviolet–visible spectrophotometer（UV–Vis）.TEM results show that the sphere–like CZTS nanoparticles with diameter between 12 and 35 nm are *** studies indicate that the prepared CZTS nanocrystals form kesterite crystal structure,and the CZTSSe films with kesterite crystal structure are also obtained at the annealing temperatures of 500 and550 °*** particular after annealing at 500 °C for 20 min,the CZTSSe film exhibits a smooth,uniform,crack-free,and large-grained topography and possesses Cu-poor and Sn-rich ***,it shows strong optical absorption from visible to near-infrared（IR） region,and its optical band gap（Eg） is found to be about 1.44 e V.

关键词： Thin films Oleylamine solvothermal Crystal structure CZTS nanocrystals

Revitalizing Human-Robot Interaction: Phygital Twin Driven Robot Avatar for China-Sweden Teleoperation

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Chinese Journal of Mechanical Engineering 2023年第5期36卷 1-6页

作者： Huiying Zhou Honghao lv Ruohan Wang Haiteng Wu Geng yang State Key Laboratory of Fluid Power and Mechatronic Systems School of Mechanical EngineeringZhejiang UniversityHangzhou 310027China Hangzhou Shenhao Technology Co. Ltd.Hangzhou 310000China Zhejiang Key Laboratory of Intelligent Operation and Maintenance Robot Hangzhou 310000China

1 Introduction Digital Twin(DT)is built and maintained in the digital rather physical realm[1,2].Dynamic DT mirrors the exact state of the physical system by means of multidimensional models describing the behavior of physical entity,and sensors providing the real-time coupling to models[3].Te outbreak of COVID-19 pandemic results in speeding up the virtualization and digitization of the physical entity with the support from ***,quarantine and division led by COVID-19 pandemic make human beings’eyes for the physical interaction become more *** physical world and the digital world are becoming interwoven,which indicates a new opportunity towards phygital *** is so often the question:how can I get closer to my distant companion?How can I extend my service or emotional concern to facilitate interaction in spite of space obstruction?Tese questions deserve thinking as a lesson learned from outbreak of COVID-19 pandemic.

关键词： Twin Robot closer

High adsorption of Cd(Ⅱ)by modification of synthetic zeolites Y,A and mordenite with thiourea

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Chinese Journal of Chemical Engineering 2020年第12期28卷 3117-3125页

作者： Shaoqing Zhang Tianming lv yang Mu Jiqi Zheng Changgong Meng Anhui Science and Technology University Bengbu 239000China School of chemical engineering Dalian University of TechnologyDalian 116024China Department of materials science and engineering University of WashingtonSeattleWA 98125USA

Zeolites Y,A and mordenite(ZY,ZA and ZM)were obtained from diatomite in a template-free system,and the products were modified by thiourea(TU).Characterization studies results indicated that the TU molecules were loaded onto the exterior surfaces of the synthetic zeolites as well as the *** analysis and energy-dispersive X-ray spectrometer proved that the TU molecules loaded on to ZA were more than ZY and *** of Cd(Ⅱ)was investigated,and itwas found that themodified zeolites have higher removal capacity,modified ZA is especially *** the adsorption experiments,the effects of various parameters such as sorbent content,contact time,concentration of cadmium solution,pH,selectivity and regeneration were *** the best removal efficiency by modified zeolites,the maximum adsorption capacity is 94.3 mg·g^−1,103.2 mg·g^−1 and 89.7 mg·g^−1 at 25℃,*** sorbents show good efficiency for the removal of Cd(Ⅱ)in the presence of different multivalent cations and have good regeneration *** the modified samples,removal experiments take place via ion exchange and complexation processes.

关键词： Diatomite Zeolite Thiourea Adsorption Cd(Ⅱ)removal

Role of endothelial cells in the regulation of mechanical microenvironment on tumor progression

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Acta Mechanica Sinica 2021年第2期37卷 218-228页

作者： Changling Wei Mei Tang zhiling Xu Li yang Yonggang lv Mechanobiology and Regenerative Medicine Laboratory Bioengineering CollegeChongqing UniversityChongqing 400044China Key Laboratory of Biorheological Science and Technology(Chongqing University) Ministry of EducationBioengineering CollegeChongqing UniversityChongqing 400044China

Majority of cancer patients die from cancer *** physical stimulation produced by microenvironment regulates invasive behavior of cancer *** vessel is one of the“pathways”for cancer to metastasize,in which tumor cells need to cross the endothelial barrier for intravasation and *** vessels are arranged in untraditional hierarchies and characterized with rupture,bend,swell and high permeability that are beneficial to intravasation of cancer *** vessels are accompanied with uneven blood flow,increased compression and interstitial fluid ***,excessive proliferation of tumor leads to low oxygen pressure in solid *** aberrant tumor mechanical microenvironment changes the biochemical and mechanical signal transduction of endothelial cells and participates in tumor *** current researches focus on how chemical signals regulate endothelial cell function while the role of physical cues is *** this review,the role of endothelial cells in the regulation of shear stress,intercellular force,extracellular matrix and pressure on tumor progression is summarized.

关键词： Endothelial cells.Cancer metastases Mechanical microenvironment Matrix stiffness Shear stress

A self-adaptive inorganic in-situ separator by particle crosslinking for nonflammable lithium-ion batteries

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Journal of Energy Chemistry 2025年第1期 469-480页

作者： Jiarui yang Jiuzhou Liu Wenrui Cai Ziyu Zhao Shan Wang Lu He Shanshan lv zhiwei Zhu Zhongfeng Ji Guojiang Wen Hua Li Yuanming Zhai Xuewei Fu Wei yang Yu Wang College of Polymer Science and Engineering State Key Laboratory of Polymer Materials Engineering Sichuan University

All-safe liquid-state lithium-ion batteries(ASLS-LIBs) is of great interest as they can potentially combine the safety of all-solid-state batteries with the high performance and low manufacturing cost of traditional liquid-state LIBs. However, the practical success of ASLS-LIBs is bottlenecked by the lack of advanced separator technology that can simultaneously realize high performances in puncturing-tolerability,fire-resistance, and importantly, wetting-capability with non-flammable liquid-electrolytes. Here, we propose a concept of inorganic in-situ separator(IISS) by hybrid-sol physical crosslinking directly onto the electrode surface to address the above challenges. Particularly, the hybrid-sol is designed with silica nanoparticles as the building block and poly(vinylidene difluoride) nanoparticles as the crosslinking agent. The critical factors for controlling the IISS microstructures and properties have been systematically investigated. The advantages of the IISS have been confirmed by its fast wetting with various fireresistant liquid-electrolytes, customizable thickness and porous structures, robust interface with planar or three-dimensional(3D)-structured electrodes, and importantly, unexpected self-adaptability against puncturing. Enabled by the above merits, a fire-resistant ASLS-LIB is successfully assembled and demonstrated with stable electrochemical performance. This sol-crosslinked IISS may open an avenue for the studies on the next-generation separator technology, cell assembling, solid electrolyte processing as well as non-flammable secondary batteries.

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Design of the Pneumatic Pressure Smart Shoes for an Ankle-Assisted Exoskeleton

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Journal of Bionic Engineering 2023年第4期20卷 1613-1625页

作者： Tianwen Yao Jiliang lv Liang yang Aimin Xu Shengguan Qu School of Mechanical and Automotive Engineering South China University of TechnologyGuangzhou510640China

Ankle injury is one of the most common joint diseases that people experience during *** people have suffered ankle injuries at least once in their *** studies have shown that the ankle joint provides the most power and torques during the act of walking,compared to the knee and hip *** paper presents an ankle joint exoskeleton device,which is mainly used to provide assistance and protection to the human ankle joint with a pneumatic assist drive during *** pneumatic pressure smart shoes for this ankle exoskeleton were designed for detecting the human gaits to control the exoskeleton with certain supporting forces to the ankle joints at the appropriate *** smart shoe has two sensors placed in between the wearable layer and the *** changes of the foot pressures were measured by the sensors for a microcontroller to control the *** sets of experimental tests which were 2-month trials and gait selection were used to test the *** experiments of 2-month trials were made to evaluate the stability of the *** results showed that the shoes had no damages,no air leakage,and no malfunctions after the *** trials of gait selection were made to test the recognition rate which reached at 99.9%for the shoe *** results showed that the design of the pneumatic smart shoes for the ankle-assisted exoskeleton met the requirements.

关键词： Exoskeleton Pneumatic pressure sensor Gait detection Ankle joint Bionic

Assessing quinoline removal performances of an aerobic continuous moving bed biofilm reactor(MBBR) bioaugmented with Pseudomonas citronellolis lv1

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Chinese Journal of Chemical Engineering 2023年第5期57卷 132-140页

作者： Hu Chen Ying Wang Puyu Wang Yongkang lv Innovation Institute of Environmental Industry College of Environmental Science and EngineeringTaiyuan University of TechnologyTaiyuan 030024China The State Key Laboratory of Clean and Efficient Utilization of Coal-Based Energy Taiyuan University of TechnologyTaiyuan 030024China China Institute for Radiation Protection Taiyuan 030006China Shanxi-Zheda Institute of Advanced Materials and Chemical Engineering Taiyuan 030024China

This study evaluated the bioaugmentation potential of a quinoline-degrading strain Pseudomonas citronellolis lv1 inoculation into activated sludge for treating quinoline wastewater, and results indicated the inoculation of lv1 in aerobic continuous MBBR could substantially improve the quinoline removal performance with an improved removal efficiency of 34% averagely when quinoline was used as the sole carbon and nitrogen source. Additionally, efficient removal of quinoline in enhanced MBBR occurred at the influent p H of 7.0–8.0, hydraulic retention time(HRT) of 24–28 h and influent quinoline concentration of 100–700 mg·L^(-1). High-throughput sequencing analysis indicated that bioaugmentation could increase microbial diversity and shape the microbial community structure. Although the inoculant lv1 did not remain its dominance in stage Ⅲ, bioaugmentation indeed induced the formation of effective microbial community, and the indigenous microbes including Flavobacterium, Pseudoxanthomonas,Pseudomonas, Vermamoeba, Dyadobacter and Sphingomonas might play the key role in quinoline *** to the PICRUSt, the enhanced genes encoding aromatic ring-cleavage enzyme, especially for Nheterocyclic ring-cleavage enzymes, could lead to the improved removal performance of quinoline in bioaugmentation stage. Moreover, the enhanced MBBR treated well actual coking wastewater, as indicated by high removal performance of quinoline, phenol and COD.

关键词： Aerobic quinoline degradation Pseudomonas citronellolis lv1 Bioaugmentation Microbial community Coking wastewater