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Improved Lightweight Deep Learning Algorithm in 3D Reconstruction

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Computers, Materials & Continua 2022年第9期72卷 5315-5325页

作者： tao Zhang yi Cao School of Mechanical Engineering North China University of Water Conservancy and Hydroelectric PowerZhengzhou450045China Department of Electrical and Computer Engineering University of WindsorWindsorONN9B 3P4Canada

The three-dimensional(3D)reconstruction technology based on structured light has been widely used in the field of industrial measurement due to its many *** at the problems of high mismatch rate and poor real-time performance caused by factors such as system jitter and noise,a lightweight stripe image feature extraction algorithm based on You Only Look Once v4(YOLOv4)network is ***,Mobilenetv3 is used as the backbone network to effectively extract features,and then the Mish activation function and Complete Intersection over Union(CIoU)loss function are used to calculate the improved target frame regression loss,which effectively improves the accuracy and real-time performance of feature *** experiment results show that the model size after the improved algorithm is only 52 MB,the mean average accuracy(mAP)of fringe image data reconstruction reaches 82.11%,and the 3D point cloud restoration rate reaches 90.1%.Compared with the existing model,it has obvious advantages and can satisfy the accuracy and real-time requirements of reconstruction tasks in resource-constrained equipment.

关键词： 3D reconstruction feature extraction deep learning lightweight YOLOv4

Strong room-temperature emission from defect states in CVD-grown WSe2 nanosheets

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Nano Research 2018年第7期11卷 3922-3930页

作者： Shudong Zhao Lei tao Peng Miao Xianjie wang Zhiguo Liu yi wang Bingsheng Li Yu Sui Yang wang Department of Physics Harbin Institute of Technology Harbin 150001 China School of Chemistry and Chemical Engineering Harbin Institute of Technology Harbin 150001 China Academy of Fundamental ond lnterdisciplinary Sciences Harbin Institute of Technology Harbin 150001 China

Monolayer transition metal dichalcogenides （TMDCs）, as direct bandgap semiconductors, show promise for applications in ultra-thin flexible optoelec- tronic devices. However, the optical properties and device performance are greatly affected by defects, such as vacancies, present in these materials. Vacancies exist unavoidably in mechanically exfoliated or grown by chemical vapor deposition （CVD） monolayer TMDCs; therefore, their influence on the electric and optical properties of host materials has been widely studied. Here, we report a new defect state located at 1.54 eV, which is 70 meV lower than the neutral exciton energy in as-prepared WSe2 monolayers grown by CVD. This defect state is clearly observed in photoluminescence （PL） and Raman spectra at ambient conditions. PL mapping, Rarnan mapping, and atomic force microscopy analysis indicate a solid-vapor reaction growth mechanism of the defect state formation. During a certain growth stage, nuclei with the composition of WOxSey do not fully react with the Se vapor, leading to the defect formation. This type of defects permits radiative recombination of bound neutral excitons, which can make the PL intensity as strong as the intrinsic excitation. Our findings reveal a new way to tailor the optical properties of two-dimensional TMDCs without any additional processes performed after growth.

关键词： monolayer WSe2 defects photoluminescence chemical vapordeposition (CVD) growth mechanism

Interface structures and mechanical properties of corrugated + flat rolled and traditional rolled Mg/Al clad plates

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Rare Metals 2021年第10期40卷 2947-2955页

作者： Sha Li Chao Luo Muhammad-Umar Bashir yi Jia Jian-Chao Han tao wang College of Mechanical and Vehicle Engineering Taiyuan University of TechnologyTaiyuan 030024China Engineering Research Center of Advanced Metal Composites Forming Technology and Equipment Ministry of EducationTaiyuan 030024China TYUT-UOW Joint Research Center Taiyuan University of TechnologyTaiyuan 030024China

The corrugated + flat rolling(CFR) and traditional rolling(TR) methods were used to prepare Mg/Al clad plates using AZ31 B Mg and 5052 Al plates, and the interface morphologies and mechanical properties of the resulting clad plates were compared. Examination of the microstructures of the plates showed that the TRed Mg/Al clad plate presented a straight interface, while a corrugated interface containing fractured intermetallic particulates was observed for the CFRed plate due to the inhomogeneous strain induced by the corrugated roller. During the CFR process, the corrugated roller can accelerate the rupture of the substrate work-hardening layers and facilitate the mutual extrusion of fresh metals to enhance the interface bonding. Compared with the traditional basal texture of the Mg alloy, the CFR process can change the texture morphology, thereby enhancing the plastic deformation ability of the Mg plate. Tensile tests showed that the CFRed Mg/Al clad plate exhibited a higher ultimate tensile strength(UTS, 316 MPa), which was~ 8% higher than that of the TRed plate(293 MPa). In addition, the bending curve of the CFRed clad plate was smooth and there was no stress sudden drop phenomenon in the bending process. The higher UTS and excellent bending properties of the CFRed clad plate could be attributed to the enhanced coordinated deformation ability of the substrates induced by the corrugated interface, grain refinement, and the change in the Mg alloy texture morphology.

关键词： Mg/Al clad plate Corrugated+flat rolling Traditional rolling Interface morphologies Mechanical properties

Self-Assembly Protein Superstructures as a Powerful Chemodynamic Therapy Nanoagent for Glioblastoma Treatment

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Nano-Micro Letters 2020年第11期12卷 107-125页

作者： tao Zheng Wentao wang Jon Ashley Ming Zhang Xiaotong Feng Jian Shen yi Sun Department of Health Technology Technical University of Denmark2800 Kongens LyngbyDenmark Jiangsu Collaborative Innovation Center for Biomedical Functional Materials School of Chemistry and Materials ScienceNanjing Normal UniversityNanjing 210023People’s Republic of China Key Laboratory of High Performance Polymer Material and Technology of Ministry of Education School of Chemistry and Chemical EngineeringNanjing UniversityNanjing 210023People’s Republic of China

Glioblastoma(GBM) remains a formidable challenge in *** therapy(CDT) that triggers tumor cell death by reactive oxygen species(ROS) could open up a new door for GBM ***,we report a novel CDT ***(Hb)and glucose oxidase(GOx) were employed as powerful CDT *** of encapsulating the proteins in drug delivery nanocarriers,we formulate multimeric superstructures as self-delivery entities by crosslinking *** blood cell(RBC) membranes are camouflaged on the protein superstructures to promote the delivery across blood-brain *** as-prepared RBC@Hb@GOx nanoparticles(NPs) offer superior biocompatibility,simplified structure,and high accumulation at the tumor *** successfully demonstrated that the NPs could efficiently produce toxic ROS to kill U87 MG cancer cells in vitro and inhibit the growth of GBM tumor in vivo,suggesting that the new CDT nanoagent holds great promise for treating GBM.

关键词： Self-assembly protein superstructures Glioblastoma therapy Chemodynamic therapy Self-delivery entities Blood-brain barrier

LEO navigation augmentation constellation design with the multi-objective optimization approaches

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Chinese Journal of Aeronautics 2021年第4期34卷 265-278页

作者： yi HAN Lei wang Wenju FU Haitao ZHOU tao LI Beizhen XU Ruizhi CHEN State Key Laboratory of Information Engineering in Surveying Mapping and Remote SensingWuhan UniversityWuhan 430079China Collaborative Innovation Center for Geospatial Technology Wuhan 430079China

Low Earth Orbit(LEO)satellite for navigation augmentation applications can significantly reduce the precise positioning convergence time and attract increasing attention recently.A few LEO Navigation Augmentation(LEO-NA)constellations have been proposed,while corresponding constellation design methodologies have not been systematically *** LEO-NA constellation generally consists of a huge number of LEO satellites and it strives for multiple optimization *** is essentially different from the communication constellation or earth observing constellation design *** this study,we modeled the LEO-NA constellation design problem as a multi-objective optimization problem and solve this problem with the MultiObjective Particle Swarm Optimization(MOPSO)*** objectives are used to strive for the best tradeoff between the augmentation performance and deployment efficiency,namely the Position Dilution of Precision(PDOP),visible LEO satellites and the orbit altitude.A fuzzy set approach is used to select the final constellation from a set of Pareto optimal solutions given by the MOPSO *** evaluate the performance of the optimized constellation,we tested two constellations with 144 and 288 satellites and each constellation has three optimization schemes:the polar constellation,the single-layer constellation and the two-layer *** results indicate that the optimized two-layer constellation achieves the best global coverage and is followed by the single-layer *** MOPSO algorithm can help to improve the constellation design and is suitable for solving the LEO-NA constellation design problem.

关键词： LEO-augmented multi-GNSS LEO constellation design MOPSO Multi-objective optimization Orbit optimization

A Cooperative Security Monitoring Mechanism Aided by Optimal Multiple Slave Cluster Heads for UASNs

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China Communications 2023年第5期20卷 148-169页

作者： Yougan Chen Wei wang Xiang Sun yi tao Zhenwen Liu Xiaomei Xu Key Laboratory of Underwater Acoustic Communication and Marine Information Technology Xiamen UniversityXiamen 361005China Shenzhen Research Institute of Xiamen University Shenzhen 518000China Dongshan Swire Marine Station College of Ocean and Earth SciencesXiamen UniversityXiamen 361102China State Key Laboratory of Robotics Shenyang Institute of AutomationChinese Academy of SciencesShenyang 110016China Department of Electrical and Computer Engineering University of New MexicoAlbuquerqueNM 87131USA College of Harbour and Coastal Engineering Jimei UniversityXiamen 361021China

As each cluster head(CH)sensor node is used to aggregate,fuse,and forward data from different sensor nodes in an underwater acoustic sensor network(UASN),guaranteeing the data security in a CH is very *** this paper,a cooperative security monitoring mechanism aided by multiple slave cluster heads(SCHs)is proposed to keep track of the data security of a *** designing a low complexity“equilateral triangle algorithm(ETA)”,the optimal SCHs(named as ETA-based multiple SCHs)are selected from the candidate SCHs so as to improve the dispersion and coverage of SCHs and achieve largescale data security *** addition,by analyzing the entire monitoring process,the close form expression of the probability of the failure attack identification for the SCHs with respect to the probability of attack launched by ordinary nodes is *** simulation results show that the proposed optimal ETA-based multiple SCH cooperation scheme has lower probability of the failure attack identification than that of the existing *** addition,the numerical simulation results are consistent with the theoretical analysis results,thus verifying the effectiveness of the proposed scheme.

关键词： underwater acoustic sensor networks data security cluster head nodes optimal location distribution of multiple slave cluster head nodes

Applications of Nanobiomaterials in the Therapy and Imaging of Acute Liver Failure

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Nano-Micro Letters 2021年第2期13卷 74-109页

作者： Yuanyuan Jin Haixia wang Ke yi Shixian Lv Hanze Hu Mingqiang Li Yu tao Laboratory of Biomaterials and Translational Medicine The Third Affiliated HospitalSun Yat-sen UniversityGuangzhou 510630People’s Republic of China Department of Bioengineering University of WashingtonSeattleWA 98195USA Department of Biomedical Engineering Columbia UniversityNew YorkNY 10027USA

Acute liver failure(ALF),a fatal clinical disease featured with overwhelming hepatocyte necrosis,is a grand challenge in global ***,a satisfactory therapeutic option for curing ALF is still absent,other than liver *** are currently being developed for the diagnosis and treatment of *** liver can sequester most of nanoparticles from blood circulation,which becomes an intrinsic superiority for nanobiomaterials targeting hepatic *** can enhance the bioavailability of free drugs,thereby significantly improving the therapeutic effects in *** can also increase the liver accumulation of therapeutic agents and enable more effective targeting of the liver or specific liver *** addition,stimuli-responsive,optical,or magnetic nanomaterials exhibit great potential in the therapeutical,diagnostic,and imaging applications in ***,therapeutic agents in combination with nanobiomaterials increase the specificity of ALF therapy,diminish adverse systemic effects,and offer a multifunctional theranostic *** holds excellent significance and prospects in ALF *** this review,we summarize the therapeutic mechanisms and targeting strategies of various nanobiomaterials in *** highlight recent developments of diverse nanomedicines for ALF therapy,diagnosis,and ***,the challenges and future perspectives in the theranostics of ALF are also discussed.

关键词： Acute liver failure Nanomaterials Drug/gene/cytokines delivery Targeted therapy Imaging

Bio-inspired vibrational wireless underground communication system

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Journal of Rock Mechanics and Geotechnical Engineering 2022年第4期14卷 1042-1051页

作者： yi Zhong Junliang(Julian)tao Center for Bio-mediated and Bio-inspired Geotechnics School of Sustainable Engineering and the Built EnvironmentArizona State UniversityTempeAZ85287USA

The internet of the underground things(IoUT)is an emerging field that concerns connected underground sensing nodes and can find applications in various fields such as geotechnical engineering,precision agriculture,and search and rescue *** complex underground environment and multiphase nature of the soil pose challenges to wireless underground *** existing studies on wireless underground communication focus on the use of electromagnetic ***,as a highly lossy material for electromagnetic waves,soil can limit the range and reliability of data *** by subterranean animals that rely on vibrations or seismic waves for underground communication,the prototype system developed in this study is based on *** system includes a bioinspired vibrating source,a micro-electromechanical system(MEMS)accelerometer,a microcontroller,and a set of algorithms for encoding and decoding ***,the mole ratsinspired source is small in size,low in cost,and *** on-off-keying decoding algorithm enhanced with an error-correction algorithm is found to be robust in transmitting textual and imaginary *** the current design,a maximum transmission bit rate of 16e17 bits per second and a transmission distance of 80 cm can be *** bit error ratio is as low as 0.1%,demonstrating the robustness of the *** performance of the developed system shows that seismic waves produced by vibration can be used as an information carrier and can potentially be implemented in the IoUT.

关键词： Bio-inspired vibration Underground communication Seismic wave Wireless communication Internet of underground things(IoUT)

Disposal of zinc extraction residues via iron ore sintering process:an innovative resource utilization

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Journal of Iron and Steel Research International 2024年第7期31卷 1636-1645页

作者： Chun-long Fan Cheng-yi Ding tao Yang Yun-fei Luo yi-fan wang Qian Li Hong-ming Long School of Metallurgical Engineering Anhui University of TechnologyMa'anshan 243002AnhuiChina Zhongye Changtian International Engineering Co. Ltd.Changsha 410205HunanChina Key Laboratory of Metallurgical Emission Reduction and Resources Recycling(Ministry of Education) Anhui University of TechnologyMa'anshan 243002AnhuiChina

Zinc extraction residue,a solid waste generated from the treatment of zinc-containing dust in rotary kilns,is commonly stockpiled in steel companies for extended *** poses significant disposal challenges and environmental pollution *** far,research on the treatment of zinc extraction residues has been slow,inadequate,and *** this gap,a novel approach was proposed to effectively treat the zinc extraction residue via the iron ore sintering *** was feasible to add 1 wt.%of zinc extraction residues to the sintering raw *** more adequate mineralization reaction resulted in higher yield and tumbler indexes,despite a slight decrease in sintering *** this may result in a slight decrease in sintering speed,the more complete mineralization reaction leads to improved sintering yield and tumbler ***,the addition of zinc extraction residues reduced the CO and NO_(x) concentrations in the sintering flue ***,the iron ore sintering process provided a viable solution for resource utilization and environmentally friendly treatment of zinc extraction residues.

关键词： Zinc extraction residue Iron ore sintering Co-processing Waste utilization Gas pollutant reduction