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Dynamic adaptive spatio-temporal graph network for COVID-19 forecasting

CAAI Transactions on Intelligence Technology 2024年第3期9卷 769-786页

作者： Xiaojun Pu Jiaqi Zhu Yunkun Wu Chang Leng zitong bo Hongan Wang Institute of Software Chinese Academy of Sciences BeijingChina Ecovacs Robotics Co. Ltd.SuzhouJiangsuChina Automotive Software Innovation Center ChongqingChina

Appropriately characterising the mixed space-time relations of the contagion process caused by hybrid space and time factors remains the primary challenge in COVID-19 ***,in previous deep learning models for epidemic forecasting,spatial and temporal variations are captured separately.A unified model is developed to cover all spatio-temporal ***,this measure is insufficient for modelling the complex spatio-temporal relations of infectious disease transmission.A dynamic adaptive spatio-temporal graph network(DASTGN)is proposed based on attention mechanisms to improve prediction *** DASTGN,complex spatio-temporal relations are depicted by adaptively fusing the mixed space-time effects and dynamic space-time dependency *** dual-scale model considers the time-specific,space-specific,and direct effects of the propagation process at the fine-grained ***,the model characterises impacts from various space-time neighbour blocks under time-varying interventions at the coarse-grained *** performance comparisons on the three COVID-19 datasets reveal that DASTGN achieves state-of-the-art results with a maximum improvement of 17.092%in the root mean-square error and 11.563%in the mean absolute *** results indicate that the mechanisms of designing DASTGN can effectively detect some spreading characteristics of *** spatio-temporal weight matrices learned in each proposed module reveal diffusion patterns in various *** conclusion,DASTGN has successfully captured the dynamic spatio-temporal variations of COVID-19,and considering multiple dynamic space-time relationships is essential in epidemic forecasting.

关键词： adaptive COVID-19 forecasting dynamic intervention spatio-temporal graph neural networks

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Screening antimicrobial peptides and probiotics using multiple deep learning and directed evolution strategies

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Acta Pharmaceutica Sinica B 2024年第8期14卷 3476-3492页

作者： Yu Zhang Li-Hua Liu bo Xu Zhiqian Zhang Min Yang Yiyang He Jingjing Chen Yang Zhang Yucheng Hu Xipeng Chen zitong Sun Qijun Ge Song Wu Wei Lei Kaizheng Li Hua Cui Gangzhu Yang Xuemei Zhao Man Wang Jiaqi Xia Zhen Cao Ao Jiang Yi-Rui Wu Tidetron Bioworks Technology(Guangzhou)Co. Ltd.Guangzhou Qianxiang Bioworks Co.Ltd.Guangzhou 510000China Biology Department and Institute of Marine Sciences College of ScienceShantou UniversityShantou 515063China School of Basic Medical Sciences Hubei University of Science and TechnologyXianning 437100China School of Education Jianghan UniversityWuhan 430056China Yeasen Biotechnology(Shanghai)Co. Ltd.Shanghai 200000China School of Basic Medicine Jiamusi UniversityJiamusi 154000China

Owing to their limited accuracy and narrow applicability,current antimicrobial peptide(AMP)prediction models face obstacles in industrial *** address these limitations,we developed and improved an AMP prediction model using Comparing and Optimizing Multiple DEep Learning(COMDEL)algorithms,coupled with high-throughput AMP screening method,finally reaching an accuracy of 94.8%in test and 88%in experiment verification,surpassing other state-of-the-art *** conjunction with COMDEL,we employed the phage-assisted evolution method to screen Sortase in vivo and developed a cell-free AMP synthesis system in vitro,ultimately increasing AMPs yields to a range of 0.5-2.1 g/L within ***,by multi-omics analysis using COMDEL,we identified Lactobacillus plantarum as the most promising candidate for AMP generation among 35 edible *** this,we developed a microdroplet sorting approach and successfully screened three *** mutants,each showing a twofold increase in antimicrobial ability,underscoring their substantial industrial application values.

关键词： Antimicrobial peptide Deep learning Cell-free synthesis Probiotics L.plantarum

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Underwater image enhancement by maximum-likelihood based adaptive color correction and robust scattering removal

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Frontiers of Computer Science 2023年第2期17卷 209-223页

作者： bo WANG zitong KANG Pengwei DONG Fan WANG Peng MA Jiajing BAI Pengwei LIANG Chongyi LI School of Physics and Electronic-Electrical Engineering Ningxia UniversityYinchuan 750021China School of Computer Science and Engineering Nanyang Technological UniversitySingapore 639798Singapore

Underwater images often exhibit severe color deviations and degraded visibility,which limits many practical applications in ocean *** extensive research has been conducted into underwater image enhancement,little of which demonstrates the significant robustness and generalization for diverse real-world underwater *** this paper,we propose an adaptive color correction algorithm based on the maximum likelihood estimation of Gaussian parameters,which effectively removes color casts of a variety of underwater images.A novel algorithm using weighted combination of gradient maps in HSV color space and absolute difference of intensity for accurate background light estimation is proposed,which circumvents the influence of white or bright regions that challenges existing physical model-based *** enhance contrast of resultant images,a piece-wise affine transform is applied to the transmission map estimated via background light ***,with the estimated background light and transmission map,the scene radiance is recovered by addressing an inverse problem of image formation *** experiments reveal that our results are characterized by natural appearance and genuine color,and our method achieves competitive performance with the state-of-the-art methods in terms of objective evaluation metrics,which further validates the better robustness and higher generalization ability of our enhancement model.

关键词： underwater image enhancement adaptive color correction background light estimation

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PAE湿强剂中氯丙醇含量对纸张水提取液中氯丙醇含量的影响

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中国造纸 2024年第1期43卷 141-147页

作者：牟子曈曾莹段逸品罗明翔孙博徐江峰王登慧吴泽春李丹李浩钟怀宁广州海关技术中心广东广州510623 上海索理思特种化学品有限公司上海201108

为检测PAE湿强剂中氯丙醇的含量,本研究建立了气相色谱-质谱联用法(GC-MS),检测PAE湿强剂中1,3-二氯-2-丙醇(1,3-DCP)与3-氯-1,2-丙二醇(3-MCPD)的含量,并进行了方法学验证,同时探究了PAE湿强剂中氯丙醇含量与纸张水提取液中氯丙醇含量... 详细信息

为检测PAE湿强剂中氯丙醇的含量,本研究建立了气相色谱-质谱联用法(GC-MS),检测PAE湿强剂中1,3-二氯-2-丙醇(1,3-DCP)与3-氯-1,2-丙二醇(3-MCPD)的含量,并进行了方法学验证,同时探究了PAE湿强剂中氯丙醇含量与纸张水提取液中氯丙醇含量之间的关系。本研究对4批次某款湿强剂进行检测,发现随着湿强剂制造工艺的改进,1,3-DCP与3-MCPD的含量均有明显的下降。调整湿强剂和助留剂的添加量,抄造不同批次的纸张,同时测定纸张水提取液中的氯丙醇含量与纸张的抗张强度。结果显示,纸张水提取液中的氯丙醇含量与湿强剂中氯丙醇含量呈正相关关系,与湿强剂添加量成正比;在助留剂实际添加量超过厂家推荐添加量的情况下,纸张水提取液中的氯丙醇含量与助留剂添加量无明显关系,但会导致纸张湿、干抗张指数下降。

关键词：氯丙醇湿强剂含量纸张水提取液

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Regioselectivity of Pd-catalyzed o-carboranearylation: a theoretical view

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Organic Chemistry Frontiers 2022年第6期9卷 1686-1695页

作者： Jiying Liu Dongmin Fu zitong Chen Tiantian Li Ling-bo Qu Shi-Jun Li Wenjing Zhang Yu Lan Green Catalysis Center and College of ChemistryZhengzhou UniversityZhengzhouHenan 450001China School of Chemistry and Chemical Engineering and Chongqing Key Laboratory of Theoretical and Computational ChemistryChongqing UniversityChongqing 400030China

The mechanism and the regioselectivity of Pd-catalyzed B(4)–H arylation and B(4,5)–H diarylation foro-carborane with bidentate directing groups were investigated. The complete catalytic cycle involves Pdmediated concerted metalation–deprotonation, oxidative addition, counterion exchange, and reductiveelimination, where counterion exchange is critical. The reductive elimination is the rate- and regioselectivity-determining step for the whole catalytic cycle. B(3)-Arylation is unfavorable because the stericrepulsion between the substituent group on C(2) and the metal moiety would lead to significant distortionof o-carborane and would result in a higher activation energy for reductive elimination. The distortion ofo-carborane can be clearly observed from the change of its aromaticity in the corresponding transitionstates by the calculation of nucleus-independent chemical shifts. Moreover, counterion exchange withcarboxylate before reductive elimination significantly increases the positive charge of palladium, whichleads to a lower activation free energy for the sequential step.

关键词： elimination catalyzed reductive

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Nighttime image dehazing using color cast removal and dual path multi-scale fusion strategy

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Frontiers of Computer Science 2022年第4期16卷 147-159页

作者： bo Wang Li Hu bowen Wei zitong Kang Chongyi Li School of Physics and Electronic-Electrical Engineering Ningxia UniversityYinchuan750021China School of Computer Science and Engineering Nanyang Technological UniversitySingapore639798Singapore

Nighttime image dehazing aims to remove the effect of haze on the images captured in nighttime,which however,raises new challenges such as severe color distortion,more complex lighting conditions,and lower *** of estimating the transmission map and atmospheric light that are difficult to be accurately acquired in nighttime,we propose a nighttime image dehazing method composed of a color cast removal and a dual path multi-scale fusion *** first propose a human visual system(HVS)inspired color correction model,which is effective for removing the color deviation on nighttime hazy ***,we propose to use dual path strategy that includes an underexposure and a contrast enhancement path for multi-scale fusion,where the weight maps are achieved by selecting appropriate exposed areas under Gaussian *** experiments demonstrate that the visual effect of the hazy nighttime images in real-world datasets can be significantly improved by our method regarding contrast,color fidelity,and *** addition,our method outperforms the state-of-the-art methods qualitatively and quantitatively.

关键词： nighttime image dehazing color cast removal dual path multi-scale fusion

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China’s railway train speed,density and weight in developing

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Railway Sciences 2022年第1期1卷 131-147页

作者： bo Jiang Changhai Tian Jiehang Deng zitong Zhu Signal and Communication Research Institute China Academy of Railway Sciences Corporation LimitedBeijingChina and China Academy of Railway SciencesBeijingChina Railway Science and Technology Research and Development Center Chinese Academy of SciencesShanghaiChina China Academy of Railway Sciences BeijingChina

Purpose–This study aims to analyze the development direction of train speed,density and weight in ***/methodology/approach–The development of China’s railway in the past 40 years can be divided into 3 *** the stage of potential tapping and capacity expansion,it is important to improve the train weight and density by upgrading the existing lines,and improving transportation capacity *** the stage of railway speed increase,the first priority is to increase train speed,reduce the travel time of passenger train,and synchronously take into account the increase of train density and *** the stage of developing high-speed railway,train speed,density and weight are co-developing on ***–The train speed of high-speed railway will be 400 km h1,the interval time of train tracking will be 3 min,and the traffic density will be more than 190 pairs per *** running speed of high-speed freight EMU will reach 200 km h1 and *** maximum speed of passenger train on mixed passenger and freight railway can reach 200 km h*** minimum interval time of train tracking can be compressed to 5 *** freight train weight of 850 m series arrival-departure track railway can be increased to 4,500–5,000 t and that of 1,050 m series to 5,500–6,400 *** trains should gradually replace ordinary passenger trains to improve the quality of railway passenger *** formation trains will operate more in intercity railway,suburban railway and short-distance passenger ***/value–The research can provide new connotations and requirements of railway train speed,density and weight in the new railway stage.

关键词： Speed Density Weight Potential tapping and capacity expansion Railway speed increase High-speed railway

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数字孪生车间制造运营管理平台

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计算机集成制造系统 2024年第1期30卷 1-13页

作者：张永平左颖刘博胡天亮刘庭煜刘晓军吕海洋朱毅明施一明吴恒何宏宏孙翰林张奕帆胡鹏飞邹孝付李瑞琪王子同陶飞北京航空航天大学自动化科学与电气工程学院北京100191 山东大学机械工程学院山东济南250002 东南大学机械工程学院江苏南京210096 国机智能技术研究院有限公司北京100083 和利时科技集团有限公司北京100176 浙江大学控制科学与工程学院杭州310027 中国科学院软件研究所北京100190 中国电子技术标准化研究院物联网研究中心北京100010 北京航空航天大学中法工程师学院北京100191 北京航空航天大学人工智能研究院北京100191 北京航空航天大学国际交叉科学研究院数字孪生国际研究中心北京100191

数字孪生使能的制造信息物理融合是数字经济时代制造业发展的主流方向,数字孪生车间作为制造基础单元,能够基于可信数据和模型的融合决策实现面向多场景适配的制造运营管理能力提升。针对制造运营管理精益化、柔性化、智能化发展需求,... 详细信息

数字孪生使能的制造信息物理融合是数字经济时代制造业发展的主流方向,数字孪生车间作为制造基础单元,能够基于可信数据和模型的融合决策实现面向多场景适配的制造运营管理能力提升。针对制造运营管理精益化、柔性化、智能化发展需求,以及制造运营管理能力与物理需求难适配、制造运营管理模式与物理状态难适用、制造运营管理策略与物理场景难适应的问题,提出了数字孪生车间制造运营管理平台,阐述了其系统组成、特点和关键技术。在此基础上,随着制造运营管理向着包含物理资源和虚拟资源的跨组织、跨企业智能化协同运营延伸,提出了跨组织/跨企业的“组织管理规范洞察决策改善”协同运营管理策略,为支撑车间内、企业内、跨企业等制造运营管理理论研究和应用落地提供系列理论和方法参考。

关键词：数字孪生车间制造运营管理数模融合协同运营

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上海市奉贤区药用植物资源调查与评估

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绿色科技 2024年第7期26卷 114-117页

作者：刘波杨梓桐傅颖苏禄晖朱丽红王爽姜宜君沙妙清潘琪上海市医药学校上海200135 上海应用技术大学生态技术与工程学院上海201418

采用实地与文献研究相结合的方法,对上海市奉贤区药用植物资源开展调研并对植物物种、生活型、资源类型等进行统计分析。结果表明:区内共计药用植物746种,隶属152科485属。经统计,按资源类型,野生植物与栽培植物资种类相差悬殊,各占总数... 详细信息

采用实地与文献研究相结合的方法,对上海市奉贤区药用植物资源开展调研并对植物物种、生活型、资源类型等进行统计分析。结果表明:区内共计药用植物746种,隶属152科485属。经统计,按资源类型,野生植物与栽培植物资种类相差悬殊,各占总数17.29%和82.71%;按药用部位,根及根茎类药用植物最多,全草类次之。在调研的基础上,对其现有资源现状进行了评估,建议在推进区域内生态建设的同时,合理开发利用药用植物资源,加强优质种质资源圃建设,以保护珍稀濒危药用植物资源生境与种群的完整性;加强区域内群众的宣传教育,提升其资源保护意识,因地制宜,开展人工种植,加强资源综合开发利用,改善生态环境,带动药用植物资源产业的健康发展。

关键词：药用植物资源调查奉贤区

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深部矿井埋管充填体换热器蓄/释热过程中的热干扰问题

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煤炭学报 2023年第3期48卷 1155-1168页

作者：张波杨紫桐刘浪赵玉娇郇超王美屠冰冰西安科技大学能源学院陕西西安710054 西安科技大学建筑与土木工程学院陕西西安710054 西安科技大学理学院陕西西安710054

矿床开采形成的丰富地下空间为太阳能等可再生能源的大规模存储提供了基本条件。将地埋管换热器置入矿井充填体中构建出具有蓄/释热功能的埋管充填体换热器是实现太阳能等可再生能源跨季节存储的新方法,但是热干扰问题会影响其蓄/释热... 详细信息

矿床开采形成的丰富地下空间为太阳能等可再生能源的大规模存储提供了基本条件。将地埋管换热器置入矿井充填体中构建出具有蓄/释热功能的埋管充填体换热器是实现太阳能等可再生能源跨季节存储的新方法,但是热干扰问题会影响其蓄/释热性能而不容忽视。利用COMSOL仿真软件建立并验证了典型蛇形埋管充填体换热器的三维非稳态传热模型,通过管间热干扰系数(I_(tub))和层间热干扰系数(I_(lay))量化研究了管间距、管径、充填体导热系数和比热容对埋管充填体换热器的单层蛇形管管间和多层蛇形管层间热干扰影响,通过引入相对灵敏度参数讨论分析了管间和层间热干扰对研究参数的敏感度。结果分析表明,I_(tub)随蓄/释热时间呈先下降后上升的变化趋势,整体变化不大(0.92~1.00),说明单层蛇形管管间热干扰影响较小。I_(lay)呈单调显著递减,在蓄/释热阶段末分别低于0.25和0.49,说明多层蛇形埋管层间热干扰随着蓄/释热的进行严重恶化。通过灵敏度分析发现,I_(lay)对研究参数的敏感度明显高于I_(tub)。I_(lay)对充填体比热容、管间距、充填体导热系数和管内径的敏感度依次降低,其中充填体比热容和管间距为正面影响,另外2个为负面影响。I_(tub)在蓄/释热的大部分时间段对管间距最敏感。本研究量化了关键参数对埋管充填体换热器热干扰的影响,为优化蛇形埋管布置及充填材料制备以降低热干扰影响提供了依据。

关键词：热干扰埋管充填体换热器蓄/释热性能季节性储能蛇形埋管

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