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Using CONTAM to design ventilation strategy of negative pressure isolation ward considering different height of door gaps

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Energy and Built Environment

Energy and Built Environment 2024年第1期5卷 32-45页

作者： Mingyao Ma changsheng Cao Yukun xu Zhijian Liu Lingjie Zeng Chengquan Zhang Jun Gao School of Mechanical Engineering Tongji UniversityShanghai 200092China Department of Power Engineering North China Electric Power UniversityBaodingHebei 071003China College of Civil Engineering Tongji UniversityShanghai 200092China

Infectious disease departments in hospitals require pressure gradient to create unidirectional airflow to prevent the spread of contaminants,typically by creating active air infiltration through the difference between supply and exhaust air volumes.The door gap is the channel of air flow between rooms,so its height has an important influence on the pressure difference and infiltration air volume of the room.There is still a lack of research on setting reasonable ventilation strategies according to the different heights of door gaps at different positions in the building.In this study,model of a set of isolation wards was established and analyzed using the multi-zone simulation software CONTAM,and the ventilation strategies with different heights of door gaps were applied to the actual infection diseases department.The results show that in a building with ventilation system divided by functional area,the difference in the height of the door gaps requires different active infiltration air volumes.Pressure fluctuations in the medical and patient corridors are greater than in other rooms.The significance of this study is to understand the active infiltration of air to guide the design and operation of ventilation systems in infectious disease hospitals or building remodeled to isolate close contacts of COVID-19 patients.It is also instructive for the design of pressure gradients in clean workshops,biological laboratories,and other similar buildings.

关键词： Door gap height Active infiltration Pressure gradient Multizone model CONTAM Control strategy

Non-dominated sorting based multi-page photo collage

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Computational Visual Media 2022年第2期8卷 199-212页

作者： Yu Song Fan Tang Weiming Dong changsheng xu NLPR Institute of AutomationChinese Academy of SciencesBeijing 100040China School of Artificial Intelligence University of Chinese Academy of SciencesBeijing 100190China School of Artificial Intelligence Jilin UniversityChangchun 130012China CASIA-LLvision Joint Lab Beijing 100190China

The development of social networking services(SNSs)revealed a surge in image sharing.The sharing mode of multi-page photo collage(MPC),which posts several image collages at a time,can often be observed on many social network platforms,which enables uploading images and arrangement in a logical order.This study focuses on the construction of MPC for an image collection and its formulation as an issue of joint optimization,which involves not only the arrangement in a single collage but also the arrangement among different collages.Novel balance-aware measurements,which merge graphic features and psychological achievements,are introduced.Non-dominated sorting genetic algorithm is adopted to optimize the MPC guided by the measurements.Experiments demonstrate that the proposed method can lead to diverse,visually pleasant,and logically clear MPC results,which are comparable to manually designed MPC results.

关键词： multi-page photo collage balance-aware measurements non-dominated sorting genetic algorithm

LiZr_(2)(PO_(4))_(3)surface coating towards stable layer structure Li_(1.2)Mn_(0.54)Ni_(0.13)Co_(0.13)O_(2)cathode materials with long cycle performance

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Nano Research 2023年第2期16卷 2373-2382页

作者： Hao Yang Jie Wang changsheng xu Kewei Wu Fangfang Zou xuebu Hu Zhongli Hu College of Chemistry and Chemical Engineering Chongqing University of TechnologyChongqing 400054China

Li-rich manganese-based materials are considered to be the mainstream cathode materials for next-generation lithium-ion batteries due to high discharge capacity and low cost,but poor cycle life and high temperature performance limit their development.Herein,LiZr_(2)(PO_(4))_(3)(LZPO)is coated on the surface of spherical Li_(1.2)Mn_(0.54)Ni_(0.13)Co_(0.13)O_(2)(LMNCO)material by a simple wet chemical method.The LZPO layer not only has the function of traditional coating layer to inhibit the occurrence of side reactions between electrolyte and LMNCO surface but also promotes the formation of spinel phase in the layered structure,increases the content of lattice oxygen,and reduces the content of absorbed oxygen.Thus,LZPO coated LMNCO has a more stable layered structure during cycling compared pure LMNCO,which improves effectively its long life and high temperature performance.The capacity loss rate of LZPO coated LMNCO is only 16.2%and 11.9%after 350 cycles at 25℃and 200 cycles at 50℃,respectively.Moreover,the capacity retention rate of the full cell composed of LZPO coated LMNCO and graphite is 70.7%after 200 cycles at 1.0 C.The coating layer toward stable surface structure can provide an idea for the modification of cathode materials,especially for Li-rich manganese-based materials.

关键词： Li_(1.2)Mn_(0.54)Ni_(0.13)Co_(0.13)O_(2) LiZr_(2)(PO_(4))_(3) layered structure cycle life high temperature

Transformers in computational visual media:A survey

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Computational Visual Media 2022年第1期8卷 33-62页

作者： Yifan xu Huapeng Wei Minxuan Lin Yingying Deng Kekai Sheng Mengdan Zhang Fan Tang Weiming Dong Feiyue Huang changsheng xu NLPR Institute of AutomationChinese Academy of SciencesBeijing 100190China School of Artificial Intelligence University of Chinese Academy of SciencesBeijing 100040China School of Artificial Intelligence Jilin UniversityChangchun 130012China Youtu Lab Tencent Inc.Shanghai 200233China CASIA-LLVISION Joint Lab Beijing 100190China

Transformers,the dominant architecture for natural language processing,have also recently attracted much attention from computational visual media researchers due to their capacity for long-range representation and high performance.Transformers are sequence-to-sequence models,which use a selfattention mechanism rather than the RNN sequential structure.Thus,such models can be trained in parallel and can represent global information.This study comprehensively surveys recent visual transformer works.We categorize them according to task scenario:backbone design,high-level vision,low-level vision and generation,and multimodal learning.Their key ideas are also analyzed.Differing from previous surveys,we mainly focus on visual transformer methods in low-level vision and generation.The latest works on backbone design are also reviewed in detail.For ease of understanding,we precisely describe the main contributions of the latest works in the form of tables.As well as giving quantitative comparisons,we also present image results for low-level vision and generation tasks.Computational costs and source code links for various important works are also given in this survey to assist further development.

关键词： visual transformer computational visual media(CVM) high-level vision low-level vision image generation multi-modal learning

Tourmaline geochemistry as genetic evolution and metallogenic potential indicators of pegmatites: a case study from the Tugeman Be-Li deposit， Middle Altun

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Journal of Earth Science 2024年

作者： Hang Li Xingwang xu Tao Hong Qiang Ke Yince Ma Kai Kang Zhiquan Yang changsheng Guo College of Architecture and Civil Engineering Sanming University Key Laboratory of Mineral Resources Institute of Geology and Geophysics Chinese Academy of Sciences University of Chinese Academy of Sciences Innovation Academy for Earth Science Chinese Academy of Sciences Guangdong Provincial Key Lab of Geodynamics and Geohazards School of Earth Sciences and Engineering Sun Yat-Sen University Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai) No.3 Geological Party Xinjiang Bureau of Geology and Mineral Exploration and Development

Tourmaline is a common borosilicate mineral in granite and pegmatite， and it is also an important carrier to record the physicochemical evolution information of magmas. However， the genetic relationship between pegmatite-type rare metal mineralization potential and tourmaline-bearing pegmatites is not clear， and the tourmaline geochemical indication of the mineralization type of rare metals needs to be supplemented. In the middle Altun region， extensive tourmaline-bearing pegmatite dykes are prevalent within and surrounding the Tugeman complex. In this paper， the petrology and geochemical characteristics of tourmaline within the pegmatite of the Tugeman Be-Li deposit have been comprehensively analyzed. The research delves into the genetic evolution and metallogenic potential of the pegmatite， emphasizing the indicative role of tourmaline geochemistry in discerning mineralization types in the Tugeman Be-Li deposit. Major and trace element analysis of tourmaline reveals varying contents of FeO （9.37 wt.%–17.10 wt.%）， Al2O3（28.64 wt.%–35.22% wt.%）， and MgO （0.13 wt.%–2.47 wt.%） in the Tugeman Be–Li pegmatite. Li， Zn， and Sn contents range from 204 ppm to 1 590 ppm， 1 143 ppm to 4 089 ppm， and 74 ppm to 396 ppm， respectively. The tourmaline analyzed in this study is magmatic origin and belongs to schorl series， exhibits substitution relationships， including (Na， Fe2+)(X□， Al)-1， (Fe2+， Fe3+)（Mg， Al）-1， (Al，X□)(R2+， Na)-1，（Na， Mg）(X□， Al)-1andX□NaR2+-1. The trace element data of tourmaline show that lithium has four enrichment stages in different mineral crystallization phases. Notably， the tendency of tourmaline in the Tugeman Be-Li pegmatite to evolve towards elbaite implies a magmatic evolution sequence from low to high， transitioning through microcline-albite pegmatite， muscovite-microcline-albite pegmatite， albite pegmatite， and microcline pegmatite. Furthermore， we also propose that the Sc content in schorl can serve as an indicator of pegmatite mineralization type and the Tugeman Be-Li pegmatite has evolved to

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SiamCPN:Visual tracking with the Siamese center-prediction network

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Computational Visual Media 2021年第2期7卷 253-265页

作者： Dong Chen Fan Tang Weiming Dong Hanxing Yao changsheng xu School of Artificial Intelligence University of Chinese Academy of SciencesBeijing 100040China NLPR Institute of AutomationChinese Academy of SciencesBeijing 100190China School of Artificial Intelligence Jilin UniversityChangchun 130012China CASIA-LLVISION Joint Lab Beijing 100190China LLVISION Technology Co. LTD.Beijing 100190China

Object detection is widely used in object tracking;anchor-free object tracking provides an end-to-end single-object-tracking approach.In this study,we propose a new anchor-free network,the Siamese center-prediction network(SiamCPN).Given the presence of referenced object features in the initial frame,we directly predict the center point and size of the object in subsequent frames in a Siamese-structure network without the need for perframe post-processing operations.Unlike other anchor-free tracking approaches that are based on semantic segmentation and achieve anchor-free tracking by pixel-level prediction,SiamCPN directly obtains all information required for tracking,greatly simplifying the model.A center-prediction sub-network is applied to multiple stages of the backbone to adaptively learn from the experience of different branches of the Siamese net.The model can accurately predict object location,implement appropriate corrections,and regress the size of the target bounding box.Compared to other leading Siamese networks,SiamCPN is simpler,faster,and more efficient as it uses fewer hyperparameters.Experiments demonstrate that our method outperforms other leading Siamese networks on GOT-10K and UAV123 benchmarks,and is comparable to other excellent trackers on LaSOT,VOT2016,and OTB-100 while improving inference speed 1.5 to 2 times.

关键词： s Siamese network single object tracking anchor-free center point detection

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基于变形图匹配的知识图谱多跳问答

北京航空航天大学学报 2024年第2期50卷 529-534页

作者：李香粤方全胡骏钱胜胜徐常胜郑州大学河南先进技术研究院郑州450000 中国科学院自动化研究所模式识别国家重点实验室北京100190

知识图谱问答(KGQA)是给定自然语言问题,对问题进行语义理解和解析,进而利用知识图谱进行查询、推理得出答案的过程。但知识图谱通常是不完整的,链接缺失给多跳问答带来许多挑战。许多方法在利用知识图谱嵌入时忽略了重要的路径信息来... 详细信息

知识图谱问答(KGQA)是给定自然语言问题,对问题进行语义理解和解析,进而利用知识图谱进行查询、推理得出答案的过程。但知识图谱通常是不完整的,链接缺失给多跳问答带来许多挑战。许多方法在利用知识图谱嵌入时忽略了重要的路径信息来评估路径和多关系问题之间的相关性;且使用文本语料库也会限制文本增强模型的可扩展性。针对这些现有方法的缺陷,提出了基于变形图匹配的知识图谱问答(DGM-KGQA)模型,该模型同时利用问题和主题实体构建语义子图,与知识图谱的局部结构匹配并找到正确答案。在基准数据集MetaQA上的实验结果验证了DGM-KGQA的有效性,该模型在完整知识图谱上检索到的答案准确率分别比PullNet、EmbedKGQA增加了4.2%、0.8%;在完整度仅有一半的知识图谱上检索到的答案准确率分别比PullNet、EmbedKGQA增加了11.1%、0.5%。实验证明提出的变形图匹配模型能够有效地增强知识图谱的关联性及多跳问答的答案准确率。

关键词：自然语言问题链接缺失文本语料库多跳问答变形图匹配

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侵彻引信过载等效缩比试验方法

探测与控制学报 2024年第2期46卷 74-79页

作者：续俸恺李禄刚李长生南京理工大学智能弹药技术国防重点学科实验室江苏南京210094 北京理工大学机电学院北京100081 湖北三江航天红林探控有限公司湖北孝感432000

在侵彻引信的研制过程中,受试验条件和试验成本的限制,缩比试验成为验证引信起爆控制策略、考核引信抗冲击性能的重要方法。针对目前引信等效缩比理论不完善,不能有效指导缩比试验设计的现状,以过载等效为原则,结合典型弹引系统等效模... 详细信息

在侵彻引信的研制过程中,受试验条件和试验成本的限制,缩比试验成为验证引信起爆控制策略、考核引信抗冲击性能的重要方法。针对目前引信等效缩比理论不完善,不能有效指导缩比试验设计的现状,以过载等效为原则,结合典型弹引系统等效模型和侵彻阻力模型,提出在侵彻有限厚混凝土靶工况下引信的缩比方法。以300 kg战斗部为原型弹、155 mm弹为缩比弹进行等效缩比方法验证,通过模型优化,最终引信过载峰值相差4.9%,脉宽相差5.6%,缩比弹与原型弹引信过载相似度较高,证明了该等效缩比方法的有效性。

关键词：侵彻引信过载等效传递函数数值仿真

基于多模态掩码Transformer网络的社会事件分类

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北京航空航天大学学报 2024年第2期50卷 579-587页

作者：陈宏钱胜胜李章明方全徐常胜郑州大学河南先进技术研究院郑州450000 中国科学院自动化研究所北京100190

多模态社会事件分类的关键是充分且准确地利用图像和文字2种模态的特征。然而,现有的大多数方法存在以下局限性:简单地将事件的图像特征和文本特征连接起来,不同模态之间存在不相关的上下文信息导致相互干扰。因此,仅仅考虑多模态数据... 详细信息

多模态社会事件分类的关键是充分且准确地利用图像和文字2种模态的特征。然而,现有的大多数方法存在以下局限性:简单地将事件的图像特征和文本特征连接起来,不同模态之间存在不相关的上下文信息导致相互干扰。因此,仅仅考虑多模态数据模态间的关系是不够的,还要考虑模态之间不相关的上下文信息(即区域或单词)。为克服这些局限性,提出一种新颖的基于多模态掩码Transformer网络(MMTN)模型的社会事件分类方法。通过图-文编码网络来学习文本和图像的更好的表示。将获得的图像和文本表示输入多模态掩码Transformer网络来融合多模态信息,并通过计算多模态信息之间的相似性,对多模态信息的模态间的关系进行建模,掩盖模态之间的不相关上下文。在2个基准数据集上的大量实验表明:所提模型达到了最先进的性能。

关键词：多模态社会事件分类社交媒体表示学习多模态Transformer网络