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Multi-Equipment Detection Method for Distribution Lines Based on Improved YOLOx-s

Computers, Materials & Continua 2023年第12期77卷 2735-2749页

作者： Lei Hu Yuanwen Lu Si Wang Wenbin wang Yongmei Zhang School of Computer and Information Engineering Jiangxi Normal UniversityNanchang330022China School of Digital Industry Jiangxi Normal UniversityShangrao334005China Department of Science and Technology State Grid Jiangxi Electric Power Research InstituteNanchang330096China School of Information North China University of TechnologyBeijing100144China

The YOLOx-s network does not sufficiently meet the accuracy demand of equipment detection in the autonomous inspection of distribution lines by Unmanned Aerial Vehicle(UAV)due to the complex background of distribution lines,variable morphology of equipment,and large differences in equipment sizes.Therefore,aiming at the difficult detection of power equipment in UAV inspection images,we propose a multi-equipment detection method for inspection of distribution lines based on the YOLOx-s.Based on the YOLOx-s network,we make the following improvements:1)The Receptive Field Block(RFB)module is added after the shallow feature layer of the backbone network to expand the receptive field of the network.2)The Coordinate Attention(CA)module is added to obtain the spatial direction information of the targets and improve the accuracy of target localization.3)After the first fusion of features in the Path Aggregation Network(PANet),the Adaptively Spatial Feature Fusion(ASFF)module is added to achieve efficient re-fusion of multi-scale deep and shallow feature maps by assigning adaptive weight parameters to features at different scales.4)The loss function Binary Cross Entropy(BCE)Loss in YOLOx-s is replaced by Focal Loss to alleviate the difficulty of network convergence caused by the imbalance between positive and negative samples of small-sized targets.The experiments take a private dataset consisting of four types of power equipment:Transformers,Isolators,Drop Fuses,and Lightning Arrestors.On average,the mean Average Precision(mAP)of the proposed method can reach 93.64%,an increase of 3.27%.The experimental results show that the proposed method can better identify multiple types of power equipment of different scales at the same time,which helps to improve the intelligence of UAV autonomous inspection in distribution lines.

关键词： Distribution lines UAV autonomous inspection power equipment detection YOLOx-s

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For the sake of longevity:eating less and eating at the right time

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signal Transduction and Targeted Therapy 2022年第10期7卷 3616-3617页

作者： Fei Sun Si Wang Guang-Hui Liu Beijing Institute for Stem Cell and Regenerative Medicine Beijing 100101China Department of Cell Biology Duke University Medical CenterDurhamNCUSA Advanced Innovation Center for Human Brain Protection and National Clinical Research Center for Geriatric DisordersXuanwu Hospital Capital Medical UniversityBeijing 100053China Aging Translational Medicine Center International Center for Aging and CancerBeijing Municipal Geriatric Medical Research CenterXuanwu HospitalCapital Medical UniversityBeijing 100053China The Fifth People’s Hospital of Chongqing Chongqing 400062China State Key Laboratory of Membrane Biology Institute of ZoologyChinese Academy of SciencesBeijing 100101China University of Chinese Academy of Sciences Beijing 100049China

In a recent issue of Science,Acosta-Rodriguez et al.defined a feeding paradigm to maximize the effects of caloric restriction(CR)on lifespans.Aligning feeding with the circadian rhythm and imposing>12-hour fasting daily on caloric-restricted animals can optimally extend lifespans.While embracing the projection of our life expectancy in the last 100~150 years,we are facing aging,an all-new challenge in human evolution.Aging-associated diseases have gradually replaced communicable diseases,becoming the top cause of death globally.The increasing social and medical burdens call for not only novel therapies for chronic diseases but also early interventions that mitigate the progression of aging and extend life and health spans.

关键词： life aging globally

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Multiplicity of Periodic Bouncing Solutions for Sublinear Damped Variation Systems via Nonsmooth Variational Methods

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Acta Mathematica sinica,English Series 2023年第7期39卷 1332-1350页

作者： si Qi wang Fei GUO School of Mathematics Tianjin UniversityTianjin 300354China Tianjin Key Laboratory of Brain-Inspired Intelligence Technology Tianjin 300354China

Two results about the multiplicity of nontrivial periodic bouncing solutions for sublinear damped vibration systems-x=g(t)x+f(t,x) are obtained via the Generalized Nonsmooth Saddle Point Theorem and a technique established by Wu Xian and wang Shaomin.Both of them imply the condition "f≥0" required in some previous papers can be weakened,furthermore,one of them also implies the condition about ■F(t,x)/■t required in some previous papers,such as "|■F(t,x)/■t|=σ_(0)F(t,x)" and "|■F(t,x)/■t|≤C(1+F(t,x))", is unnecessary,where F(t,x):=∫_(0)~xf(t,x)ds,and σ_(0),C are positive constants.

关键词： Damped vibration systems generalized Nonsmooth Saddle Point Theorem sublinear conditions periodic bouncing solutions multiplicity

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Biological Eagle-eye Inspired Target Detection for Unmanned Aerial Vehicles Equipped with a Manipulator

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Machine Intelligence Research 2023年第5期20卷 741-752页

作者： Yi-Min Deng si-Yuan wang School of Automation Science and Electrical Engineering Beihang UniversityBeijing 100191China

Inspired by eagle eye mechanisms,the structure and information processing characteristics of the eagle′s visual system are used for the target capture task of an unmanned aerial vehicle(UAV)with a mechanical arm.In this paper,a novel eagle-eye inspired multi-camera sensor and a saliency detection method are proposed.A combined camera system is built by simulating the double fovea structure on the eagle retina.A saliency target detection method based on the eagle midbrain inhibition mechanism is proposed by measuring the static saliency information and dynamic features.Thus,salient targets can be accurately detected through the collaborative work between different cameras of the proposed multi-camera sensor.Experimental results show that the eagle-eye inspired visual system is able to continuously detect targets in outdoor scenes and that the proposed algorithm has a strong inhibitory effect on moving background interference.

关键词： Unmanned aerial vehicle(UAV) eagle eye multi-camera sensor target detection saliency detection

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From the first human gene-editing to the birth of three-parent baby

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Science China(Life Sciences) 2016年第12期59卷 1341-1342页

作者： Xiaoxue Zhang Si Wang Higher Education Press Beijing 100029China National Laboratory of Biomacromolecules CAS Center for Excellence in Biomacromolecules Institute of BiophysicsChinese Academy of SciencesBeijing 100101China

Gene Editing refers to the process of making targeted modifications to the genome,such as the deletion,insertion or replacement of targeted DNA sequences(Pan et al.,2011).Gene editing technologies fundamentally improve our approaches to biological basic research,gene therapy,genetic improvement,etc.In the field of stem cells,gene editing can be used to modulate cell fate,such as generation of induced pluripotent stem cells(i PSCs)(Ding et al.,2015),

关键词： gene DNA

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Research on Ubiquitous Map Visualization for Ternary Space

Research on Ubiquitous Map Visualization for Ternary Space

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作者： Si Wang Guangxia wang Institute of Geographical Spatial Information Information Engineering University

In the era of information and communication technology（ICT） and big data,the map gradually shows a new qualitative feature of "spatiotemporal ubiquitous" with the extension of its object space,expression space and information source,which challenges the theory of cartographic visualization.This paper discusses the ubiquitous map visualization from the object content and expression form.Oriented to the ternary space,it divides the object dimension of ubiquitous map visualization and analyzes the expression characteristics of ubiquitous map visualization.Based on that,it constructs the variable system,symbol system and method system of ubiquitous map visualization.With three cases of the metro roadmap,the tag map,and the three-dimensional（3D） city map,the application of the proposed content is explained to illustrate its effectiveness.The research in this paper is expected to further enrich the theoretical basis of cartographic visualization and provide theoretical support for the expression and application of ubiquitous map visualization.

关键词： Ubiquitous Map Ternary Space Visualization Variables Map Symbol Scene

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Seed size affects rodent–seed interaction consistently across plant species but not within species:evidence from a seed tracking experiment of 41 tree species

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Integrative Zoology 2022年第5期17卷 930-943页

作者： si CHEN Li FENG Bo wang School of Resources and Environmental Engineering Anhui UniversityHefeiAnhui ProvinceChina Key Laboratory of Tropical Forest Ecology Xishuangbanna Tropical Botanical GardenChinese Academy of SciencesMenglaYunnan ProvinceChina Ailaoshan Station of Subtropical Forest Ecosystem Studies Xishuangbanna Tropical Botanical GardenChinese Academy of SciencesJingdongYunnan ProvinceChina Anhui Province Key Laboratory of Wetland Ecosystem Protection and Restoration(Anhui University) HefeiAnhui ProvinceChina

Scatter-hoarding rodents play a crucial role in seed survival and seed dispersal.As one of the most important seed traits,seed size and its effect on rodent–seed interaction attract lots of attention.Current studies usually target one or a few species and show inconsistent patterns;however,few experiments include a large number of species although many plant species usually coexist in natural forest and overlap in fruiting time.Here,we tracked the dispersal and predation of 26100 seeds belonging to 41 tree species in a subtropical forest for 2 years.Most species showed no relationships between seed size and rodent foraging preference,while the remaining species displayed diverse of patterns:monotonic decrease and increase trends,and hump-shaped and U-shaped patterns,indicating that a one-off study with a few species might give misleading information.However,the seed size effect across species was consistent in both years,indicating that including a large number of species that hold a sufﬁcient range of seed size may avoid the aforementioned bias.Interestingly,seed size effect differed among rodent foraging processes:a negative effect on seed harvest,a hump-shaped effect on seed removal and removal distance,while a positive effect on overwinter survival of cached seeds,indicating that rodents may make trade-offs between large and small seeds both among foraging processes and within a single process,thus lead to a parabolic relationship between seed size and seed dispersal success,that is medium-sized seeds were more likely to be removed and cached,and transported with a further distance.

关键词： foraging preference plant–animal interaction scatter-hoarding seed dispersal seed predation

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Research on Ubiquitous Map Information Organization Oriented to Location-Based Aggregation

Research on Ubiquitous Map Information Organization Oriented...

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作者： Si Wang Guangxia wang Institute of Geographical Spatial Information Information Engineering University

In the era of information and communication technology（ICT） and big data,the map gradually shows a new qualitative feature of "spatiotemporal ubiquitous" due to the extension of its object space and the geographic information it contains,which brings new challenges to map information organization.This paper analyzes the concept and information characteristics of the ubiquitous map.Based on that,it proposes a ubiquitous map information organization model oriented to location-based aggregation.This new model includes three parts as "ubiquitous map instance","location-based aggregation mode" and "map scene".This paper focuses on the "map scene" part which is the core of the model and contains two mutually mapped aspects as "content scene" and "representation scene".And both aspects are divided into three levels as "features" ←→ "elements" ←→ "scenes" according to ubiquitous map information characteristics and location-based aggregation mode.With cases of map decomposition,the application of the model is explained to illustrate its effectiveness.The model is expected to provide powerful data organization and management capabilities for ubiquitous map production and use.

关键词： Ubiquitous Map Information Organization Location-Based Aggregation Map Scene

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Emergence of charge density wave and Ising superconductivity in centrosymmetric monolayer 1T-HfTe_(2)

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Nano Research 2023年第8期16卷 11521-11527页

作者： Dawei wang Jizheng Wu Chen si Department of Medical Engineering Medical Supplies Center of PLA General HospitalBeijing 100853China School of Materials Science and Engineering Beihang UniversityBeijing 100191China

Understanding and control of many-body collective phenomena such as charge density wave(CDW)and superconductivity in atomically thin crystals remains a hot topic in material science.Here,using first-principles calculations,we find that 1T-HfTe_(2)possessing no CDWs in the bulk form,unexpectedly shows a stable 2×2 CDW order in the monolayer form,which can be attributed to the enhancement of electron–phonon coupling(EPC)in the monolayer.Meanwhile,the CDW induces a metal-to-insulator transition in monolayer 1T-HfTe_(2)through the accompanying lattice distortion.Remarkably,Ising superconductivity with a significantly enhanced in-plane critical field can emerge in centrosymmetric monolayer 1T-HfTe_(2)after the CDW is suppressed by electron doping.The Ising paring is revealed to be protected by the spin–orbital locking without the participation of the inversion symmetry breaking which is a must for conventional 2H-NbSe2-like Ising superconductors.Our results open a new window for designing and controlling novel quantum states in two-dimensional(2D)matter.

关键词： charge density wave(CDW) Ising superconductivity two-dimensional(2D)materials HfTe_(2) first-principles calculations

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MiR-142-3p Regulates ILC1s by Targeting HMGB1 via the NF-κB Pathway in a Mouse Model of Early Pregnancy Loss

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Current Medical Science 2024年第1期44卷 195-211页

作者： Xiang-li PANG Jie LI Jing wang si-si YAN Jing YANG Department of Obstetrics and Gynecology Renmin Hospital of Wuhan UniversityWuhan 430060China Reproductive Medical Center Renmin Hospital of Wuhan UniversityWuhan 430060China Clinic Research Center for Assisted Reproductive Technology and Embryonic Development in Hubei Province Wuhan 430060China

Objective Innate lymphoid cells(ILCs)are a class of newly discovered immunocytes.Group 1 ILCs(ILC1s)are identified in the decidua of humans and mice.High mobility group box 1(HMGB1)is predicted to be one of the target genes of miR-142-3p,which is closely related to pregnancy-related diseases.Furthermore,miR-142-3p and HMGB1 are involved in regulating the NF-κB signaling pathway.This study aimed to examine the regulatory effect of miR-142-3p on ILC1s and the underlying mechanism involving HMGB1 and the NF-κB signaling pathway.Methods Mouse models of normal pregnancy and abortion were constructed,and the alterations of ILC1s,miR-142-3p,ILC1 transcription factor(T-bet),and pro-inflammatory cytokines of ILC1s(TNF-α,IFN-γand IL-2)were detected in mice from different groups.The targeting regulation of HMGB1 by miR-142-3p in ILC1s,and the expression of HMGB1 in normal pregnant mice and abortive mice were investigated.In addition,the regulatory effects of miR-142-3p and HMGB1 on ILC1s were detected in vitro by CCK-8,Annexin-V/PI,ELISA,and RT-PCR,respectively.Furthermore,changes of the NF-κB signaling pathway in ILC1s were examined in the different groups.For the in vivo studies,miR-142-3p-Agomir was injected in the uterus of abortive mice to evaluate the abortion rate and alterations of ILC1s at the maternal-fetal interface,and further detect the expression of HMGB1,pro-inflammatory cytokines,and the NF-κB signaling pathway.Results The number of ILC1s was significantly increased,the level of HMGB1 was significantly upregulated,and that of miR-142-3p was considerably downregulated in the abortive mice as compared with the normal pregnant mice(all Psignaling pathway(Psignificantly downregulated and the activation of the NF-κB signaling pathway was inhibited in the miR-142-3p Agomir group(all Psion miR-142-3p can regulate ILC1s by targeting HMGB1

关键词： maternal-fetal interface group 1 innate lymphoid cells(ILCis) high mobility group box 1(HMGB1) miR-142-3p abortion

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