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An Innovative Deep Architecture for Flight Safety Risk Assessment Based on Time Series Data

Computer Modeling in Engineering & Sciences 2024年第3期138卷 2549-2569页

作者： hong sun Fangquan Yang Peiwen Zhang Yang Jiao Yunxiang Zhao Civil Aviation Flight Technology and Flight Safety Research Base Civil Aviation Flight University of ChinaGuanghan618307China Airport Academy Civil Aviation Flight University of ChinaGuanghan618307China School of Economics and Management Civil Aviation Flight University of ChinaGuanghan618307China China Academy of Civil Aviation Science and Technology Beijing101300China Flight Training Standards Branch Civil Aviation Flight University of ChinaGuanghan618307China

With the development of the integration of aviation safety and artificial intelligence,research on the combination of risk assessment and artificial intelligence is particularly important in the field of risk management,but searching for an efficient and accurate risk assessment algorithm has become a challenge for the civil aviation industry.Therefore,an improved risk assessment algorithm(PS-AE-LSTM)based on long short-term memory network(LSTM)with autoencoder(AE)is proposed for the various supervised deep learning algorithms in flight safety that cannot adequately address the problem of the quality on risk level labels.Firstly,based on the normal distribution characteristics of flight data,a probability severity(PS)model is established to enhance the quality of risk assessment labels.Secondly,autoencoder is introduced to reconstruct the flight parameter data to improve the data quality.Finally,utilizing the time-series nature of flight data,a long and short-termmemory network is used to classify the risk level and improve the accuracy of risk assessment.Thus,a risk assessment experimentwas conducted to analyze a fleet landing phase dataset using the PS-AE-LSTMalgorithm to assess the risk level associated with aircraft hard landing events.The results show that the proposed algorithm achieves an accuracy of 86.45%compared with seven baseline models and has excellent risk assessment capability.

关键词： Safety engineering risk assessment time series data autoencoder LSTM

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Omadacycline in the treatment of scrub typhus:Three case reports

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World Journal of Clinical Cases 2024年第25期12卷 5832-5838页

作者： Xue-Mei Lang Yun Qiu Ya-Juan Jia hong sun Su-Min Gao hong-Mei Zhao Department of Emergency Medicine The Affiliated Huaian No.1 People's Hospital of Nanjing Medical UniversityHuai’an 223000Jiangsu ProvinceChina

BACKGROUND Scrub typhus is a naturally occurring acute infectious disease that is primarily transmitted through the bites of chiggers or larval mites infected by Orientia tsutsugamushi(O.tsutsugamushi).Omadacycline,a novel tetracycline,exhibits potent antibacterial efficacy against both typical bacteria and atypical pathogens.However,omadacycline application in the treatment of scrub typhus remains limited.CASE SUMMARY In the present work,we report several cases of scrub typhus,with the main clinical symptoms being fever,the formation of eschars or ulcers,local or systemic lymphadenopathy,headache,myalgia and rash.Blood samples were collected before omadacycline was administered,and O.tsutsugamushi infection was confirmed through targeted next-generation sequencing(tNGS).After two days of treatment,the patients’symptoms,including fever,were alleviated,with no adverse drug reactions.CONCLUSION tNGS is an effective method for diagnosing scrub typhus.Omadacycline can be considered an alternative option for antiinfective therapy in patients with O.tsutsugamushi infections.

关键词： Omadacycline Scrub typhus Orientia tsutsugamushi Targeted nextgeneration sequencing Eschar Case report

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Laser manufacturing of spatial resolution approaching quantum limit

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Light(Science & Applications) 2024年第3期13卷 421-428页

作者： Xiao-Jie Wang hong-Hua Fang Zhen-Ze Li Dan Wang hong-Bo sun State Key Laboratory of Precision Measurement Technology and Instruments Department of Precision InstrumentTsinghua UniversityBeijing 100084China State Key Laboratory of Integrated Optoelectronics College of Electronic Science and EngineeringJilin University2699 Qianjin StreetChangchun 130012China

Atomic and close-to-atom scale manufacturing is a promising avenue toward single-photon emitters,single-electron transistors,single-atom memory,and quantum-bit devices for future communication,computation,and sensing applications.Laser manufacturing is outstanding to this end for ease of beam manipulation,batch production,and no requirement for photomasks.It is,however,suffering from optical diffraction limits.Herein,we report a spatial resolution improved to the quantum limit by exploiting a threshold tracing and lock-in method,whereby the two-order gap between atomic point defect complexes and optical diffraction limit is surpassed,and a feature size of<5 nm is realized.The underlying physics is that the uncertainty of local atom thermal motion dominates electron excitation,rather than the power density slope of the incident laser.We show that the colour centre yield in hexagonal boron nitride is transformed from stochastic to deterministic,and the emission from individual sites becomes polychromatic to monochromatic.As a result,single colour centres in the regular array are deterministically created with a unity yield and high positional accuracy,serving as a step forward for integrated quantum technological applications.

关键词： quantum limit resolution

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A Weakly-Supervised Crowd Density Estimation Method Based on Two-Stage Linear Feature Calibration

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IEEE/CAA Journal of Automatica Sinica 2024年第4期11卷 965-981页

作者： Yong-Chao Li Rui-Sheng Jia Ying-Xiang Hu hong-Mei sun the College of Computer Science and Engineering Shandong University of Science and TechnologyQingdao 266590 the Faculty of Information Science and Engineering Ocean University of ChinaQingdao 266000China the College of Computer Science and Engineering Shandong University of Science and TechnologyQingdao 266590China the College of Computer Science and Engineering Nanjing University of Science and TechnologyNanjing 210000China

In a crowd density estimation dataset,the annotation of crowd locations is an extremely laborious task,and they are not taken into the evaluation metrics.In this paper,we aim to reduce the annotation cost of crowd datasets,and propose a crowd density estimation method based on weakly-supervised learning,in the absence of crowd position supervision information,which directly reduces the number of crowds by using the number of pedestrians in the image as the supervised information.For this purpose,we design a new training method,which exploits the correlation between global and local image features by incremental learning to train the network.Specifically,we design a parent-child network(PC-Net)focusing on the global and local image respectively,and propose a linear feature calibration structure to train the PC-Net simultaneously,and the child network learns feature transfer factors and feature bias weights,and uses the transfer factors and bias weights to linearly feature calibrate the features extracted from the Parent network,to improve the convergence of the network by using local features hidden in the crowd images.In addition,we use the pyramid vision transformer as the backbone of the PC-Net to extract crowd features at different levels,and design a global-local feature loss function(L2).We combine it with a crowd counting loss(LC)to enhance the sensitivity of the network to crowd features during the training process,which effectively improves the accuracy of crowd density estimation.The experimental results show that the PC-Net significantly reduces the gap between fullysupervised and weakly-supervised crowd density estimation,and outperforms the comparison methods on five datasets of Shanghai Tech Part A,ShanghaiTech Part B,UCF_CC_50,UCF_QNRF and JHU-CROWD++.

关键词： Crowd density estimation linear feature calibration vision transformer weakly-supervision learning

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Significantly Enhanced Melt Memory Effect of Metallocene-made Isotactic Polypropylene Containing Talc

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Chinese Journal of Polymer Science 2024年第2期42卷 213-222,I0008页

作者： hong-Wen sun Fu-Shan Wang Yan Gao Fu-Qing Wei Jia-Chun Feng State Key Laboratory of Molecular Engineering of Polymers Department of Macromolecular ScienceFudan UniversityShanghai200433China Lanzhou Petrochemical Corporation of PetroChina Lanzhou730060China Lanzhou Petrochemical Research Center Petrochemical Research Institute of PetroChinaLanzhou730060China

The melt memory effect is a widely observed phenomenon in semi-crystalline polymers. In practical applications, various additives are usually introduced into polymers, which may affect their melt memory behavior. In this work, the effect of talc on the melt memory effect of metallocene-made isotactic polypropylene(M-PP) was investigated in detail by using the differential scanning calorimetry. The results indicated that the introduction of talc significantly strengthened the melt memory effect of M-PP. Specifically, the upper limit temperature of Domain II increased from 161 ℃ to 174 ℃, resulting in a substantial widening of the temperature range of Domain IIa from 1 ℃ to 14 ℃. Analysis of the crystal orientation of the M-PP containing talc cooled from various Ts suggested that the remarkably enhanced melt memory effect could be ascribed to the stabilization of oriented nuclei facilitated by talc. This stabilizing effect was likely attributable to the prefreezing effect or the sorption interaction between talc and the M-PP chains.

关键词： Metallocene-made isotactic polypropylene Talc Melt memory effect Crystal orientation

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Necroptosis contributes to non-alcoholic fatty liver disease pathoetiology with promising diagnostic and therapeutic functions

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World Journal of Gastroenterology 2024年第14期30卷 1968-1981页

作者： hong-Ju sun Bo Jiao Yan Wang Yue-Hua Zhang Ge Chen Zi-Xuan Wang hong Zhao Qing Xie Xiao-Hua Song Department of General Medicine Qingdao Central HospitalUniversity of Health and Rehabilitation Sciences(Qingdao Central Medical Group)Qingdao 266042Shandong ProvinceChina Department of Gastroenterology Qingdao Central HospitalUniversity of Health and Rehabilitation Sciences(Qingdao Central Medical Group)Qingdao 266042Shandong ProvinceChina Department of Medical Administration Qingdao Central HospitalUniversity of Health and Rehabilitation Sciences(Qingdao Central Medical Group)Qingdao 266042Shandong ProvinceChina Qingdao Medical College Qingdao UniversityQingdao 266042Shandong ProvinceChina Department of Infectious Diseases Ruijin HospitalShanghai Jiao Tong University School of MedicineShanghai 200025China

Nonalcoholic fatty liver disease(NAFLD)is the most prevalent type of chronic liver disease.However,the disease is underappreciated as a remarkable chronic disorder as there are rare managing strategies.Several studies have focused on determining NAFLD-caused hepatocyte death to elucidate the disease pathoe-tiology and suggest functional therapeutic and diagnostic options.Pyroptosis,ferroptosis,and necroptosis are the main subtypes of non-apoptotic regulated cell deaths(RCDs),each of which represents particular characteristics.Considering the complexity of the findings,the present study aimed to review these types of RCDs and their contribution to NAFLD progression,and subsequently discuss in detail the role of necroptosis in the pathoetiology,diagnosis,and treatment of the disease.The study revealed that necroptosis is involved in the occurrence of NAFLD and its progression towards steatohepatitis and cancer,hence it has potential in diagnostic and therapeutic approaches.Nevertheless,further studies are necessary.

关键词： Nonalcoholic fatty liver disease Apoptosis Necroptosis Cell death Diagnosis Treatment

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PARAMETER OPTIMIZATION AND VIBRATION REDUCTION ANALYSIS OF DOUBLE ELECTROMAGNETIC SHUNT TUNED MASS DAMPER

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Gongcheng Lixue/Engineering Mechanics 2024年第5期41卷 155-166页

作者： sun, hong-Xin Huang, Chao-Yang Luo, Yi-Fan Wang, Xiu-Yong Wen, Qing School of Civil Engineering Hu’nan University of Science and Technology Hu’nan Provincial Key Laboratory of Intelligent Disaster Prevention-Mitigation and Ecological Restoration in Civil Engineering Hu’nan Xiangtan 411201 China

A novel electromagnetic shunt tuned mass damper (EMS-TMD) is proposed for structural vibration control. A new feature of the damper is the electromagnetic damping element that replaces the viscous damping of the traditional double tuned mass dampers. To further improve the damping performance and robustness of the damper, a double electromagnetic shunt tuned mass damper (DEMS-TMD) is designed. According to the Alembert’s theorem, the dynamic model of the coupled system DEMS-TMD and a single degree of freedom structure under seismic excitation is established. Based on the Monte Carlo pattern search method with the target of minimizing the value of the maximum dynamic amplification coefficient of the main structure displacement, the optimal parameters of DEMS-TMD, the structure frequency ratio, the electrical frequency ratio, the electromagnetic damping ratio and the electromechanical coupling coefficient are obtained, which provides the theoretical guidance for damping parameter design. The frequency and time domain simulations of the DEMS-TMD are conducted to analyze the performance of the vibration suppression of the DEMS-TMD. The results show that the reduction of the peak and RMS values of main structure displacement of the DEMS-TMD is superior to traditional parallel double tuned mass dampers (DTMD) in the frequency domain simulations. The reduction of the peak and RMS values of displacement and acceleration of the DEMS-TMD is superior to traditional DTMD in the time domain simulations, which shows the better damping effect of the DEMS-TMD on structures. © 2024 Tsinghua University. All rights reserved.

关键词： Acceleration

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FeNi Prussian blue analogues on highly graphitized carbon nanosheets as efficient glucose sensors

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Rare Metals 2024年第6期43卷 2730-2738页

作者： Jin-Hang Xue Qiu-hong sun Cheng Han Yuan-Dong Yang Shao-Jie Xu Qi-Peng Li Jin-Jie Qian College of Life and Environmental Science Wenzhou University College of Chemistry and Materials Engineering Wenzhou University College of Chemistry and Chemical Engineering Zhaotong University

Meeting the continuous glucose monitoring requirements of individuals necessitates the research and development of sensors with high sensitivity and stability.In this study,a straightforward strategy was proposed for synthesizing ultra-thin oxygen-rich graphitized carbon nanosheets（denoted as GCS-O）.These nanosheets are obtained by calcining a topologically two-dimensional indium-based coordination polymer.Subsequently,the growth of FeNi Prussian blue analogue（PBA） on GCS-O effectively introduces active sites and increases the nitrogen content within the carbonaceous matrix.The resulting FeNi-PBA/GCS-O composite exhibits excellent glucose sensing performance with a broad linear range of 1 to 1300μmol·L-1.Meanwhile,it also achieves a high sensitivity of 2496 μA·mmol-1·L·cm-2,a limit of detection of 100nmol·L-1（S/N=3）,and commendable long-term durability.The relatively simple synthesis process,exceptional sensitivity,and satisfactory electrochemical sensing performance of FeNi-PBA/GCS-O open up new directions for biosensor applications.

关键词： Coordination polymer Carbon nanosheet Prussian blue analogue Surface reconstruction Glucose oxidation

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Vibration reduction control of a semisubmersible floating offshore wind turbine by the distributed tuned mass dampers under combined wind and wave excitations

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Zhendong Gongcheng Xuebao/Journal of Vibration Engineering 2024年第4期37卷 565-577页

作者： Luo, Yi-Fan sun, hong-Xin Wang, Xiu-Yong Chen, An-Hua Peng, Jian Zuo, Lei College of Civil Engineering Hunan University of Science and Technology Xiangtan 411201 China Hunan Provincial Key Laboratory of Structural Engineering for Wind Resistant and Vibration Control Hunan University of Science and Technology Xiangtan 411201 China School of Mechanical Engineering Hunan University of Science and Technology Xiangtan 411201 China Department of Naval Architecture and Marine Engineering University of Michigan Ann Arbor 48109 United States

To address the threat of harmful vibrations of semisubmersible floating offshore wind turbine（FOWT）in complex deep-sea environments to the safety and durability，a design of distributed tuned mass dampers（TMDs）is proposed to control the plat‑ form pitch motion under the randomly combined wind and wave excitations，in combination with the geometric structure of the 5MW prototype of NREL in the United States. The distributed TMDs are installed inside the platform to form an equilateral trian‑ gle arrangement. To better describe the performance of the distributed TMDs on the semisubmersible FOWT，a 9-degree-of-free‑ dom multi-body dynamics model is proposed and established for the coupled semisubmersible FOWT-TMDs system based on La‑ grange's equation and the modal superposition method. Based on the H∞ algorithm，whose optimization objective is the peak value of the frequency response function of platform pitch motion，the parameters of the distributed TMDs are optimally designed，where the coupling relationship between multiple TMDs is considered. The numerical simulation of the coupled FOWT-TMDs system under the combined wind and wave excitations is carried out to analyze the performance of the distributed TMDs on the platform pitch response of the wind turbine. The results show that the distributed TMDs with optimal design has good damping performance on the platform pitch motion of the semisubmersible FOWT. Under random wind and wave loads in three different working condi‑ tions，the peak and standard deviation vibration reduction rates of the power spectral density curve near the natural frequency of platform pitch can reach more than 39% and 52%，respectively. The research method and results can provide reference for dynam‑ ic analysis and vibration control design of large semisubmersible FOWT. © 2024 Nanjing University of Aeronautics an Astronautics. All rights reserved.

关键词： Vibration control

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Double-confined nanoheterostructure Sb/Sb2S3@Ti3C2Tx@C toward ultra-stable Li-/Na-ion batteries

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Rare Metals 2024年第5期43卷 2067-2079页

作者： Dan Wang Qun Ma Huan He Zhi-Yuan Wang Run-Guo Zheng hong-Yu sun Yan-Guo Liu Chun-Li Liu School of Materials Science and Engineering Northeastern University School of Resources and Materials Northeastern University at Qinhuangdao Key Laboratory of Dielectric and Electrolyte Functional Material Hebei Province Department of Physics and Oxide Research Center Hankuk University of Foreign Studies

Antimony-based materials with high capacities and moderate potentials are promising anodes for lithium-/-sodium-ion batteries.However,their tremendous volume expansion and inferior conductivity lead to poor structural stability and sluggish reaction kinetics.Herein,a doubleconfined nanoheterostructure Sb/Sb2S3@Ti3C2Tx@C has been fabricated through a solvothermal method followed by low-temperature heat treatment.The dual protection of‘‘MXene’’and‘‘carbon’’can better accommodate the volume expansion of Sb/Sb2S3.The strong covalent bond （Ti–S,Ti–O–Sb,C–O–Sb） can firmly integrate Sb-based material with Ti3C2Txand carbon,which significantly improves the structure stability.In addition,the carbon layer can restrain the oxidation of MXenes,and the nano-Sb/Sb2S3can facilitate electron/ion transport and suppress the restacking of MXenes.The heterogeneous interface between Sb and Sb2S3can further promote interfacial charge transfer.The MXene-Sb/Sb2S3@C-1 with the optimal Sb content shows high specific capacities,comparable rate properties and ultra-stable cycling performances (250 m Ah·g-1after 2500 cycles at 1 A·g-1for sodium-ion batteries).Ex situ X-ray diffractometer （XRD）test reveals the storage mechanism including the conversion and alloying process of MXene-Sb/Sb2S3@C-1.Cyclic voltammetry （CV） test results demonstrate that the pseudocapacitance behavior is dominant in MXene-Sb/Sb2S3@C-1,especially at large current.This design paves the way for exploring high-performance alloy-based/conversion-type anode for energy storage devices.

关键词： Sb/Sb 2 S 3 MXene Carbon Anode Lithium-ion batteries Sodium-ion batteries

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