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Monocular 3D object detection with Pseudo-LiDAR confidence sampling and hierarchical geometric feature extraction in 6G network

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数字通信与网络:英文版 2023年第4期9卷 827-835页

作者： Jianlong Zhang Guangzu Fang Bin Wang xiaobo Zhou Qingqi Pei Chen Chen School of Electronic Engineering Xidian UniversityXi'an710071China School of Computer science and technology College of Intelligence and ComputingTianjin UniversityTianjin300000China School of Telecommunications Engineering Xidian UniversityXi'an710071China

The high bandwidth and low latency of 6G network technology enable the successful application of monocular 3D object detection on vehicle *** 3D-object-detection-based Pseudo-LiDAR is a low-cost,lowpower solution compared to LiDAR solutions in the field of autonomous ***,this technique has some problems,i.e.,(1)the poor quality of generated Pseudo-LiDAR point clouds resulting from the nonlinear error distribution of monocular depth estimation and(2)the weak representation capability of point cloud features due to the neglected global geometric structure features of point clouds existing in LiDAR-based 3D detection ***,we proposed a Pseudo-LiDAR confidence sampling strategy and a hierarchical geometric feature extraction module for monocular 3D object *** first designed a point cloud confidence sampling strategy based on a 3D Gaussian distribution to assign small confidence to the points with great error in depth estimation and filter them out according to the ***,we present a hierarchical geometric feature extraction module by aggregating the local neighborhood features and a dual transformer to capture the global geometric features in the point ***,our detection framework is based on Point-Voxel-RCNN(PV-RCNN)with high-quality Pseudo-LiDAR and enriched geometric features as *** the experimental results,our method achieves satisfactory results in monocular 3D object detection.

关键词： Monocular 3D object detection Pseudo-LiDAR Confidence sampling Hierarchical geometric feature extraction

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Properties of Collagen/Sodium Alginate Hydrogels for Bioprinting of Skin Models

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Journal of Bionic Engineering 2023年第1期20卷 105-118页

作者： Tian Jiao Qin Lian Weilong Lian Yonghui Wang Dichen Li Rui L.Reis Joaquim Miguel Oliveira State Key Laboratory for Manufacturing System Engineering Xi’an Jiaotong UniversityXi’an710049China Shaanxi Ketao-AM technology Co. Ltd.Xi’an710100China B’s Research Group I3Bs—Research Institute on BiomaterialsBiodegradables and BiomimeticsHeadquarters of the European Institute of Excellence on Tissue Engineering and Regenerative MedicineUniversity of MinhoBarco4805-017GuimarãesPortugal ICVS/3B’s–PT Government Associate Laboratory Barco4805-017GuimarãesPortugal

3D printing technology has great potential for the reconstruction of human ***,the reconstructed skin has some differences from natural skin,largely because the hydrogel used does not have the appropriate biological and physical properties to allow healing and *** study examines the swelling,degradability,microstructure and biological properties of Collagen/Sodium Alginate(Col/SA)hydrogels of differing compositions for the purposes of skin *** the content of sodium alginate causes the hydrogel to exhibit stronger mechanical and swelling properties,a faster degradation ratio,smaller pore size,and less favorable biological *** optimal 1%collagen hydrogel was used to print bi-layer skin in which fibroblasts and keratinocytes showed improved spreading and proliferation as compared to other developed *** Col/SA hydrogels presented suitable tunability and properties to be used as a bioink for bioprinting of skin aiming at finding applications as 3D models for wound healing research.

关键词： Bioink Bioprinting-Collagen sodium alginate hydrogel-Skin Wound healing Bionic

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Formation of Face‑Centered Cubic Phase in Ti35 Alloy Under In Situ Heating Transmission Electron Microscopy

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Acta Metallurgica Sinica(English Letters) 2023年第3期36卷 486-494页

作者： Jianan Hu Mengmeng Yang Wenlong xiao Hao Wang Dehai Ping Chengze Liu Shewei xin Songquan Wu Kai Zhang Yi Yang Lai‑Chang Zhang Aijun Huang School of Materials and Chemistry University of Shanghai for Science and TechnologyShanghai 200093China Key Laboratory of Aerospace Advanced Materials and Performance of Ministry of Education School of Materials Science and EngineeringBeihang UniversityBeijing 100191China School of Chemical Engineering Zhengzhou UniversityZhengzhou 450001China xi’an Rare Metal Materials Institute Co.Ltd Xi’an 710016China Northwest Institute for Non-Ferrous Metal Research Xi’an 710016China School of Engineering Edith Cowan University270 Joondalup DriveJoondalupPerthWA 6027Australia Department of Materials science and Engineering Monash UniversityClaytonVIC 3800Australia

A thermally induced hexagonal close-packed(HCP)to face-centered cubic(FCC)phase transition was investigated in anα-type Ti35 alloy with twinned structure by in situ heating transmission electron microscopy(TEM)and ab initio *** observations indicated that the HCP to FCC phase transition occurred both within matrix/twin and at the twin boundaries in the thinner region of the TEM film,and the FCC-Ti precipitated as plates within the matrix/twin,while as equiaxed cells at twin *** crystallographic orientation relationship between HCP-Ti and FCC-Ti can be described as:{111}FCC//{0002}HCP andFCC//*** HCP to FCC phase transition was accomplished by forming an intermediate state with a BB stacking sequence through the slip of partial *** formation of such FCC-Ti may be related to the thermal stress and *** initio calculations showed that the formation of FCC-Ti may also be related to the contamination of interstitial atoms such as oxygen.

关键词： In situ heating TEM FCC titanium Phase transition Ab initio calculation

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Effects of plasma actuation and hole configuration on film cooling performance

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Propulsion and Power Research 2023年第2期12卷 227-237页

作者： Jie Sun Fuxing Zhang Jin Wang Gongnan xie Bengt Sundén School of Energy and Environmental Engineering Hebei University of TechnologyTianjin 300401China Key Laboratory of Thermo-Fluid science and Engineering(xi’an Jiaotong University) Ministry of EducationXi’an 710049China School of Marine science and technology Northwestern Polytechnical UniversityXi’an 710072China Department of Energy sciences Division of Heat TransferLund UniversityLund SE-22100Sweden

In this paper,plasma actuators are arranged asymmetrically downstream the wall to improve film cooling *** of blowing ratio,hole configuration and applied voltage on flow characteristics and film cooling effectiveness were investigated numerically on a flat *** show that highest film cooling effectiveness distribution is obtained both in the spanwise and streamwise directions under blowing ratio of *** wall film cooling effectiveness of cylindrical hole increases by 251.9%under blowing ratio of 0.5 compared to that under blowing ratio of *** scale of the counter rotating vortex pairs(CRVP)from fan shaped hole and sister hole are significantly reduced compared to that from cylindrical *** console hole has an anti-counter rotating vortex pair(Anti-CRVP),which weakens the entrainment of the CRVP to the coolant air near the *** with the cylindrical hole,average wall film cooling effectivenesses for fan shaped hole,sister hole and console hole increase by 73.1%,97.5%and 119.9%.The adherent performance of the coolant air is enhanced after applying plasma *** aerodynamic actuation of the plasma results in the rebound of the fluid close to the wall at 24 kV applied *** wall film cooling effectiveness of the console hole at 12 kV applied voltage is 10.6%higher than that without plasma.

关键词： Aerodynamic actuation Film cooling Flow control Hole configurat

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A V2V Emergent Message Dissemination Scheme for 6G-Oriented Vehicular Networks

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Chinese Journal of Electronics 2023年第6期32卷 1179-1191页

作者： CHEN Chen WANG Chenyu CONG Li xiAO Ming PEI Qingqi School of Telecommunication Engineering Xidian University The State Grid Jilin Province Electric Power Company Limited Information Communication Company KTH Royal Institute of technology

To ensure traffic safety and improve traffic efficiency, vehicular networks come up with multiple types of messages for safety and efficiency applications. In sixth-generation(6G) systems, these messages should be timely and error-free disseminated through vehicle-to-vehicle(V2V) communication to ensure traffic safety and efficiency. V2V supports direct communication between two vehicle user equipments, regardless of whether a base station is involved. We propose a packet delivery ratio(PDR)-based message dissemination scheme(PDR-MD) between V2V in 6G-oriented vehicular networks to select relay vehicles when broadcasting emergent messages. This scheme grasps the balance between vehicle distance and PDR so as to reduce transmission delay while ensuring reliable PDR. We compared the PDR-MD scheme with other probabilistic broadcasting schemes. The experimental results show that the PDRMD protocol can maintain close to 95% and above PDR in transmitting emergent messages, and the transfer rate stays below 40%.

关键词： 6G mobile communication Protocols Urban areas Vehicular ad hoc networks Broadcasting Probabilistic logic Safety

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Preparation of slow-release regulated Rs-198 bilayer microcapsules and application of its lyophilized bacterial inoculant on Capsicum annuum *** salt stress

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Particuology 2023年第8期79卷 54-63页

作者： Shuangxi Zhu Yanhui He Jiawei Dong Yujia Dong Chun Li Zhansheng Wu Yimeng Lu xi'an Key Laboratory of Textile Chemical Engineering Auxiliaries School of Environmental and Chemical EngineeringXi'an Polytechnic UniversityXi'an710048China Department of Chemical Engineering Tsinghua UniversityBeijing100084China

The survival adaptation of bacteria in saline soil is *** bilayer microcapsules were prepared by secondary embedding of monolayer sodium alginate(NaAlg)-bentonite(Bent)-sodium carboxy-methylcellulose(CMC)microcapsules wrapped with plant growth promoting rhizobacteria(PGPR)Pseudomonas putida Rs-198 by chitosan solution to promote the synergistic effect of bilayer microen-capsulation and *** characterization of the Rs-198 bilayer microcapsules showed that the amino and carboxyl groups were cross-linked and a thin layer of chitosan was formed on the outside of the *** bilayer microcapsule(Ch-d)with a chitosan concentration of 0.8 wt%and pH 6 showed a slow release of bacteria with a maximum release of 6.06 × 10^(9) cfu/g on the 7th *** viable bacteria of Ch-d increased by 4.42%after 60 days of storage compared with monolayer *** 0.9 wt%L-cysteine,10 wt%glycerinum,10 wt%trehalose and 12 wt%soluble starch were added as bacterial protective agents during the process of preparing the Ch-d lyophilized bacterial inoculant(Ch-d LBI).Pot experiments showed that Ch-d LBI exhibited better growth promotion of Capsicum annuum *** salt ***,the bilayer microcapsule as slow-release bacterial inoculant is a potential alternative for sustainable agriculture.

关键词： Pseudomonas putida Rs-198 Bilayer microcapsules Chitosan solution Lyophilized bacterial inoculant

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An innovative method used for the identification of N-glycans on soybean allergenβ-conglycinins

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Food science and Human Wellness 2023年第3期12卷 842-850页

作者： Cheng Li Yang Tian Jianli Han Yu Lu Meiyi Zou Yue Jia Chengjian Wang Linjuan Huang Zhongfu Wang Key Laboratory of Glycobiology and Glycoengineering of xi’an College of Food Science and TechnologyNorthwest UniversityXi’an 710069China College of Life sciences Northwest UniversityXi’an 710069China

β-Conglycinin is one of the major allergens existed in soybean.N-Glycans attached to theβ-conglycinin influenced the immunoreactivity and antigen presenting efficiency ofβ-*** this study,we described a new method used to release and collect the N-glycans fromβ-conglycinin,and the N-glycans existed in linear epitopes ofβ-conglycinin were *** hydrolyzed fromβ-conglycinin were purified by cotton hydrophilic *** acid was then used to release glycans from glycopeptides,and new glycopeptides containing one single N-acety1-D-glucosamine(G1 cNAc)moiety were then utilized for mass *** glycosylation sites(Asn-199,Asn-455,Asn-215,Asn-489 and Asn-326)and 22 kinds of glycopeptides were *** is noteworthy that the peptide VVN^(#)ATSNL(where^(#)represents for the glycosylation site)was analyzed to be both glycopeptide and linear *** results provided a new method for the N-glycoform analysis of food allergens,and laid a foundation for understanding the relationship between glyco sylation and food allergy.

关键词： Soybean allergenβ-conglycinin Glycopeptide Mass spectrometry N-Glycan Glycosylation site

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Robust hydrogel adhesives for emergency rescue and gastric perforation repair

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Bioactive Materials 2023年第1期19卷 703-716页

作者： Jing Yu Yanyang Qin Yuxuan Yang xiaodan Zhao Zixi Zhang Qiang Zhang Yaqiong Su Yanfeng Zhang Yilong Cheng School of Chemistry Xi’an Jiaotong UniversityXi’an710049China Key Laboratory of Shaanxi Province for Craniofacial Precision Medicine Research College of StomatologyXi’an Jiaotong UniversityXi’an710049China Department of Dermatology The First Affiliated Hospital of Xi’an Jiaotong UniversityXi’an Jiaotong UniversityXi’an710061China

Development of biocompatible hydrogel adhesives with robust tissue adhesion to realize instant hemorrhage control and injury sealing,especially for emergency rescue and tissue repair,is still ***,we report a potent hydrogel adhesive by free radical polymerization of N-acryloyl aspartic acid(AASP)in a facile and straightforward *** delicate adjustment of steric hindrance,the synergistic effect between interface interactions and cohesion energy can be achieved in PAASP hydrogel verified by X-ray photoelectron spectroscopy(XPS)analysis and simulation calculation compared to poly(N-acryloyl glutamic acid)(PAGLU)and poly(N-acryloyl amidomalonic acid)(PAAMI)*** adhesion strength of the PAASP hydrogel could reach 120 kPa to firmly seal the broken organs to withstand the external force with persistent stability under physiological conditions,and rapid hemostasis in different hemorrhage models on mice is achieved using PAASP hydrogel as physical ***,the paper-based Fe^(3+)transfer printing method is applied to construct PAASP-based Janus hydrogel patch with both adhesive and non-adhesive surfaces,by which simultaneous wound healing and postoperative anti-adhesion can be realized in gastric perforation model on *** advanced hydrogel may show vast potential as bio-adhesives for emergency rescue and tissue/organ repair.

关键词： Adhesive hydrogel Hydrogen bond Amino acid Emergency rescue Gastric perforation repair

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Clinical research of EX-PRESS drainage device and modified trabeculectomy combined with intravitreal conbercept treatment for neovascular glaucoma

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International Journal of Ophthalmology(English edition) 2022年第2期15卷 242-247页

作者： Peng Li Qing Liu xiao-Min Liu Li Wang Zhao-Jiang Du Qian-Yan Kang Department of Ophthalmology Xijing 986 HospitalFourth Military Medical UniversityXi'an 710054Shaanxi ProvinceChina Department of Ophthalmology the First Affiliated Hospital of Xi'an Jiaotong UniversityXi'an 710061Shaanxi ProvinceChina Ophthalmology Teaching and Research Section of Institute of Medical technology Xi'an Medical CollegeXi'an 710032Shaanxi ProvinceChina Department of Ophthalmology Xi'an Central HospitalXi'an 710001Shaanxi ProvinceChina

AIM:To evaluate the efficacy and safety of modified trabeculectomy(experimental group) and implantation of EX-PRESS drainage device(control group),combined with intravitreal conbercept injection for neovascular glaucoma(NVG).METHODS:Totally 30 patients with NVG were selected from June 2014 to June 2017,and randomly divided into experimental group and control *** patients were underwent intravitreal conbercept(0.5 mg/0.05 mL) treatment before *** trabeculectomy was performed in MT group,while EX-PRESS drainage device implantation was performed in EX *** success rates,best corrected visual acuity(BCVA),intraocular pressure(IOP),filtering bleb and complications were observed and ***:The differences of success rate,BCVA and filtering bleb were not statistically significant 12mo after the surgery(P>0.05),however,the difference of IOP at 1d,1wk,1,3,and 6mo after surgery was statistically significant(F_(time)=390.64,P_(time)0.05),while the results at other time point indicate statistical differences(Pplantation of EX-PRESS drainage device have clinical application value in reducing IOP and postoperative complications of refractory NVG.

关键词： modified trabeculectomy EX-PRESS conbercept neovascular glaucoma

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Technique for Recovering Wavefront Phase Bad Points by Deep Learning

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Chinese Journal of Electronics 2023年第2期32卷 303-312页

作者： WU Jiali LIANG Jingyuan FEI Shaolong ZHONG xirui Faculty of Automation & Information Engineering Xi'an University of Technology

In adaptive optics systems, the bad spot detected by the wavefront detector affects the wavefront reconstruction accuracy. A convolutional neural network(CNN) model is established to estimate the missing information on bad points, reduce the reconstruction error of the distorted wavefront. By training 10,000 groups of spot array images and the corresponding 30th order Zernike coefficient samples, learns the relationship between the light intensity image and the Zernike coefficient, and predicts the Zernike mode coefficient based on the spot array image to restore the wavefront. Following the wavefront restoration of 1,000 groups of test set samples, the root mean square(RMS) error between the predicted value and the real value was maintained at approximately 0.2 μm. Field wavefront correction experiments were carried out on three links of 600 m, 1.3 km,and 10 km. The wavefront peak-to-valley values corrected by the CNN decreased from 12.964 μm, 13.958 μm,and 31.310 μm to 0.425 μm, 3.061 μm, and 11.156 μm, respectively, and the RMS values decreased from 2.156 μm,9.158 μm, and 12.949 μm to approximately 0.166 μm, 0.852μm, and 6.963 μm, respectively. The results show that the CNN method predicts the missing wavefront information of the sub-aperture from the bad spot image, reduces the wavefront restoration error, and improves the wavefront correction performance.

关键词： Training Atmospheric modeling Optical distortion Feature extraction Adaptive optics Image restoration Convolutional neural networks

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