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Optimization of an Artificial Intelligence Database and Camera Installation for Recognition of Risky Passenger Behavior in Railway Vehicles

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Computers, Materials & Continua 2025年第1期82卷 1277-1293页

作者： min-kyeong Kim Yeong Geol Lee Won-Hee Park Su-hwan yun Tae-Soon Kwon Duckhee Lee Railroad Test&Certification Division Korea Railroad Research Institute(KRRI)Cheoldo BangmulgwanroUiwang-si16105Republic of Korea Railroad Safety Division Korea Railroad Research Institute(KRRI)Cheoldo BangmulgwanroUiwang-si16105Republic of Korea

Urban railways are vital means of public transportation in *** than 30%of metropolitan residents use the railways,and this proportion is expected to *** enhance safety,the government has mandated the installation of closed-circuit televisions in all carriages by ***,cameras still monitored *** address this limitation,we developed a dataset of risk factors and a smart detection system that enables an immediate response to any abnormal behavior and intensive monitoring *** created an innovative learning dataset that takes into account seven unique risk factors specific to Korean railway *** data collection was conducted across the Shinbundang Line of the Incheon Transportation Corporation,and the Ui-Shinseol *** observed several behavioral characteristics and assigned unique annotations to *** also considered carriage *** performance was evaluated by camera placement and *** the camera installation plan was *** dataset will find immediate applications in domestic railway *** artificial intelligence algorithms will be verified shortly.

关键词： AI railway vehicle risk factor smart detection AI training data

Physarum polycephalum-inspired adaptive optimization design of artificial microtubular networks

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Science China Chemistry 2025年

作者： Si-min Zeng Di-Wei Zheng Ting Pan Xing-Lan Ding yun Zhang Chi-Hui Yang Si-Xue Cheng Xian-Zheng Zhang Key Laboratory of Biomedical Polymers of ministry of Education&Department of Chemistry Wuhan University

Natural biological microtubular networks have undergone adaptive evolutionary selection and may offer viable solutions to design challenges in artificial microtubular networks. The plasmodium of the slime mold Physarum polycephalum(P. polycephalum) extends continuously to form a protoplasmic microtubular network structure, directly connecting food *** simulations revealed that the formation of this adaptive P. polycephalum microtubular network could be captured by a mathematical algorithm. Inspired by the P. polycephalum microtubular networks, we propose an adaptive optimization design method for artificial microtubular networks. Specifically, we utilized hydrogels with biodegradable and tissue-adhesive properties to replicate the P. polycephalum microtubular networks via photomask. In Rhodamine B diffusion and glucosecatalyzed reaction experiments, we found that the P. polycephalum microtubular networks exhibited significantly enhanced efficiency compared to vascular and artificial networks. Furthermore, we demonstrated the potential for uric acid(UA) degradation of the hydrogels with a real P. polycephalum microtubular network loaded with urate oxidase(UOx) in a rodent model of hyperuricemia. And this network achieved more than double the effect of the artificial network. This underscores the potential of natural microtubular networks to replace artificial microtubular networks.

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Prediction of compressive strength based on visualization of pellet microstructure data

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Journal of Iron and Steel Research International 2021年第6期28卷 651-660页

作者： Ai-min Yang yun-xi Zhuansun College of Science North China University of Science and TechnologyTangshan 063210HebeiChina College of Metallurgy and Energy North China University of Science and TechnologyTangshan 063210HebeiChina

In recent years,with the wide application of image data visual extraction technology in the field of industrial engineering,the development of industrial economy has reached a new *** explore the interaction between the pellet microstructure and compressive strength,firstly,the pellet microstructure needed for the experiment was obtained using a Leica DM4500P *** area proportions of hematite,calcium ferrite,magnetite,calcium silicate and pore in pellet microstructure were extracted by visual extraction technology of image ***,the relationship between the area proportions of mineral components and compressive strength was established by backpropagation neural network(BPNN),generalized regression neural network(GRNN)and beetle antennae search-generalized regression neural network(BAS-GRNN)algorithms,which proves that the pellet microstructure can be used as the prediction standard of compressive *** errors of BPNN and BAS-GRNN are 5.13%and 3.37%,respectively,both of which are less than 5.5%.Therefore,through data visualization,we are able to discuss the connection between various components of pellet microstructure and compressive strength and provide new research ideas for improving the compressive strength and metallurgical performance of pellet.

关键词： Pellet microstructure Microstructure data visualization BPNN algorithm BAS-GRNN algorithm Compressive strength

Changes in a cerebellar peduncle lesion in a patient with Dandy-Walker malformation A diffusion tensor imaging study

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Neural Regeneration Research 2013年第5期8卷 474-478页

作者： ah Young Lee Sung Ho Jang Sang Seok Yeo Ensil Lee yun Woo Cho Su min Son Department of Physical Medicine and Rehabilitation College of Medicine Yeungnam University Department of Pediatrics College of Medicine Yeungnam University

We report a patient with severe ataxia due to Dandy-Walker malformation, who showed functional recovery over 10 months corresponding to a change in a cerebellar peduncle lesion. A 20-month-old female patient who was diagnosed with Dandy-Walker syndrome and six age- and sex-matched healthy control subjects were enrolled. The superior cerebellar peduncle, the middle cerebellar peduncle, and the inferior cerebellar peduncle were evaluated using fractional anisotropy and the apparent diffusion coefficient. The patients＇ functional ambulation category was 0 at the initial visit, but improved to 2 at the follow-up evaluation, and Berg＇s balance scale score also improved from 0 to 7. Initial diffusion tensor tractography revealed that the inferior cerebellar peduncle was not detected, that the fractional anisotropy of the superior cerebellar peduncle and middle cerebellar peduncle decreased by two standard deviations below, and that the apparent diffusion coefficient increased by two standard deviations over normal control values. However, on follow-up diffusion tensor tractography, both inferior cerebellar peduncles could be detected, and the fractional anisotropy of superior cerebellar peduncle increased to within two standard deviations of normal controls. The functional improvement in this patient appeared to correspond to changes in these cerebellar peduncles. We believe that evaluating cerebellar peduncles using diffusion tensor imaging is useful in cases when a cerebellar peduncle lesion is suspected.

关键词： neural regeneration neuroimaging Dandy-Walker malformation cerebellar peduncle ataxia cerebral palsy functional ambulation category Berg's balance scale fractional anisotropy apparent diffusion coefficient diffusion tensor tractography diffusion tensor imaging grants-supported paper photographs-containing paper neuroregeneration

Design of a tunable mass damper for mitigating vibrations in milling of cylindrical parts

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Chinese Journal of Aeronautics 2019年第3期32卷 748-758页

作者： Heng YUAN min WAN yun YANG School of Mechanical Engineering Northwestern Polytechnical University State IJR Center of Aerospace Design and Additive Manufacturing Northwestern Polytechnical University

Milling the free-end of cylindrical parts, which are vertically fixed on the machine table,often suffers from large chatter vibrations. This kind of phenomenon is harmful to the cutting process. Therefore, it is of great importance to develop means to suppress these undesirable *** paper proposes a new idea for designing a tunable mass damper(TMD) to reduce vibrations in milling of cylindrical parts. Frequency response function(FRF) of the milling system is derived to comprehensively reveal the influence of both the dynamic response of the machine tools and the TMD. Critical axial depth of cut, which is usually used to characterize the process stability, is formulated by considering the FRFs of both the milling system itself and the TMD. Maximization of critical axial depth of cut is taken as objective function, while kernel dynamic parameters of TMD,which are involved in the derived expression of critical axial depth of cut, are extracted as designable variables. Optimization procedure is carried out to adjust the parameters of TMD by using sequential quadratic programming algorithm. A series of experiments with a designed passive TMD validate that the design has a good performance in reducing vibrations and improving stability of milling process.

关键词： Chatter Milling Mitigation of vibrations Stability Tunable mass damper (TMD)

Preparation of Ferrioxalate Submicrorods/Graphene Composites and Their Photocatalytic Properties

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Journal of Materials Science & Technology 2014年第2期30卷 117-122页

作者： min Fu yun Zhao Qingze Jiao School of Chemical Engineering and the Environment Beijing Institute of Technology

Ferrioxalate submicrorods/graphene composites were synthesized through a simple solvothermal process in a mixture of ethylene glycol and water. The in situ growth of ferrioxalate submicrorods and the reduction of graphene oxide （GO） were completed in a one-step reaction. Fourier transform infrared and Raman spectroscopy confirmed the reduction of GO. Uniform rod-like ferrioxalates with diameter of about 600 nm and length of several micrometers were well distributed on the graphene sheets. As-obtained composites exhibited better photocatalytic properties than pure ferrioxalate submicrorods. The influence of different contents of GO on photocatalytic performance was also investigated. A possible photocatalytic mechanism of ferrioxalate submicrorods/graphene composites was proposed.

关键词： Ferrioxalate submicrorods Graphene Photocatalysis

Isolation and characterization of a new subunit of phycocyanin from Chroomonas placoidea

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Chinese Chemical Letters 2011年第10期22卷 1229-1232页

作者： yun yun Zhang min Chen Hong Cui College of Chemical and Biological Sciences and Engineering Yantai University Yantai 264005 China Yantai Traditional Chinese Medical-science Hospital Yantai 264002 China

A new phycocyanin（PC） fluorescent subunit namedβ_2（18kDa） was isolated and characterized by both SDS-PAGE and isoelectric focusing（IEF） from a species of cryptophytic alga Chroomonas *** was separated and purified by ammonium sulfate sedimentation followed by two steps of Sephadex G-100 *** denatured in 4 mol/L urea for 48 h,PC was divided into two fractions by passing through a Sephacryl S-100 chromatography column *** blue fraction（S-1） containedβsubunits with a maximal absorbance at 595 nm in visible light *** the green fraction（S-2） enriched inαsubunits showed a characteristic long wavelength absorbance at 680-700 nm region and exhibited a relatively low molecular weight of 9.4（α_1） and 8.5 kDa（α_2）.Fraction S-1 also consisted of two different fluorescent subunits with molecular weight of 20.1 kDa（β_1） and 18 kDa （β_2） and differed from each other on isoelectric points of pH 5.7（ft） and 6.0（ft）,*** investigation of peptide sequence will help a lot in elucidating the new subunit ft that was smaller in size and more neutral than the known ft subunit,and may provide an alternative explanation in structure of cryptophytic phycobiliproteins.

关键词： Chroomonas placoidea Phycocyanin subunit Sephacryl S-100 chromatography SDS-PAGE IEF

Synthesis and Crystal Structure of Co(DMSO)_2(H_2O)_2(SCN)_2 with One-dimensional Hydrogen-bonded Structure (DMSO = Dimethylsulfoxide)

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Chinese Journal of Structural Chemistry 2006年第6期25卷 643-646页

作者： WEI Rong-min CHE yun-Xia ZHENG Ji-min Departmentof Biology Chemistry Tianjin Normal University Tianjin 300071 China

The title complex Co（DMSO）2（H2O）2（SCN）2 has been prepared and structurally characterized. It crystallizes in monoclinic, space group P21/n with a= 5.1981（9）, b = 11.944（2）, c = 12.646（2） A,β = 98.686（2）°, V = 776.2（2） A^3, C6H16CoN2O4S4, Mr = 367.38, Z = 2, De = 1.572 g/cm^3, F（000） = 378 and μ（MoKa） = 1.646 mm^-1. The structure was refined to R= 0.0232 and wR = 0.0645 for 1241 observed reflections with I 〉 2σ（I）. In the title complex, each Co（II） atom is octahedrally coordinated by four O atoms from two DMSO ligands and two water molecules as well as two N atoms from SCN^- ions. The title molecules are connected to each other through intermolecular hydrogen bonds to form a 1-D structure extended by eight-membered Co2O4H2 rings.

关键词： dimethylsulfoxide thiocyanate group supramolecule,complex intermolecular hydrogen bond

Improved uncertainty propagation method of dynamic model for Mars entry spacecraft

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航空动力学报 2014年第5期29卷 1223-1233页

作者： FU Hui-min XIAO Qiang WU yun-zhang Research Center of Small Sample Technology Beijing University of Aeronautics and Astronautics

In order to research the uncertainty propagation laws of Mars entry dynamic equations for the Mars entry phase,an improved method was presented for analyzing the effect of the initial state uncertainties and uncertainty factor on the system state in the state *** applying the method to the entry phase of one of the NASA Mars exploration missions,the simulation results agreed well with the Monte Carlo method,especially the flight path angle simulation at least reaching 92%.It is found that the improved method can not only predict the uncertainty propagation laws with high accuracy of at least 92%in flight path angle simulation and large application scope from-0.1degree to 0.1degree,compared with local linearization method,but also save several hours relative to Monte Carlo method.

关键词：不确定性传播规律动态方程月出入高精度的改进方法