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Prescribed time control based on the periodic delayed sliding mode surface without singularities

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Science China(Information Sciences) 2024年第7期67卷 256-270页

作者： Bin ZHOU Yi ding Kang-Kang Zha.G Guang-Ren DUAN Center for Control Theory and Guidance Technology Harbin Institute of Technology

In this paper, nonsingular prescribed-time control is studied based on periodic delayed sliding mode surfaces. Different from the existing sliding mode control, where either singularity problems may appear or the convergence time depends on the initial state, the proposed sliding mode control approaches can achieve prescribed-time convergence without singularity. The proposed nonsingular sliding mode control approaches can be applied to both second-order and high-order nonlinear systems with prescribed-time convergence. As applications of the proposed sliding mode control approaches, the control of hypersonic vehicle systems is revisited. Numerical simulations on the nonlinear model of the hypersonic vehicle system show the effectiveness of the proposed methods.

关键词： prescribed-time control smooth periodic delayed feedback sliding mode control high-order nonlinear systems hypersonic vehicle systems

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Physical activity volume,frequency,and intensity:Associations with hypertension and obesity over 21 years in Australian women

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Journal of Sport and Health Science 2024年第5期13卷 631-641页

作者： Gregore I.Mielke ding ding Shelley E.Keating Bruno P.Nunes Ruth Brady Wendy J.Brown School of Public Health The University of QueenslandBrisbaneQLD 4006Australia Sydney School of Public Health Faculty of Medicine and HealthThe University of SydneySydneyNSW 2006Australia The Cha.les Perkins Centre The University of SydneySydneyNSW 2006Australia School of Human Movement and Nutrition Sciences The University of QueenslandBrisbaneQLD 4072Australia School of Nursing Federal University of PelotasPelotasRio Grande do Sul 96010-610Brazil Faculty of Health Sciences and Medicine Bond UniversityGold CoastQLD 4226Australia

Background:Optimal patterns of accrual of recommended levels of physical activity(PA)for prevention of hypertension and obesity are not *** overall aim of this study was to investigate whether different patterns of accumulation of PA are differentially associated with hypertension and obesity in Australian women over 21 ***,we investigated whether,for the same weekly volume of PA,the number of sessions(frequency)and vigorousness of PA(intensity)were associated with a reduction in the occurrence of hypertension and obesity in ***:Data from the 1973-1978 and 1946-1951 cohorts of the Australian Longitudinal Study on Women's Health were analyzed(n=20,588;12%-16%with a Bachelor's or higher degree).Self-reported PA,hypertension,height,and weight were collected using mail surveys every 3 years from 1998/2000 to 2019/*** Estimating Equation models with a 3-year lag model were used to investigate the association of PA volume(metabolic equivalent min/week)(none;33-499;500-999;≥1000,weekly frequency(none;1-2 times;3-4times;5-7 times;≥8 times),and the proportion of vigorous PA to total volume of PA(none;0%;1%-33%;34%-66%;67%-100%)with odds of hypertension and obesity from 2000 to ***:The cumulative incidence of hypertension was 6%in the 1973-1978 and 23%in the 1946-1951 cohort;27%of women in the 1973-1978;and 15%in the 1946-1951 cohort developed obesity over the ***,a higher volume of PA was associated with reduced odds of hypertension and *** the volume of PA was considered,the odds of hypertension did not vary according to the frequency or intensity of ***,increased proportion of vigorous PA to the total volume of PA was associated with a small additional reduction in the risk of obe ***:PA volume appears to be more important tha. the pattern of accumulation for the prevention of hypertension and *** more sessions,particularly of vigorous-intensity PA,may provide extr

关键词： Physical activity Frequency Intensity Incidences Epidemiology Women

Synergistic effects of chemical additives and mature compost on reducing H_2S emission during kitchen waste composting

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Journal of Environmental Sciences 2024年第5期139卷 84-92页

作者： Yongdi Liu ha.hou Wang ha. Zha.g Yueyue Tao Rui Chen Sheng ha.g Xiaoyan ding Meidi Cheng Guochun ding Yuquan Wei Ting Xu Ji Li College of Resources and Environmental Science Beijing Key Laboratory of Biodiversity and Organic FarmingChina Agricultural UniversityBeijing 100193China Organic Recycling Institute(Suzhou)of China Agricultural University Wuzhong DistrictSuzhou 215128China Suzhou Academy of Agricultural Sciences Institute of Agricultural Sciences in Taihu Lake DistrictSuzhou 215155China Technical Centre for Soil Agriculture and Rural Ecology and EnvironmentMinistry of Ecology and EnvironmentBeijing 100012China College of Chemistry and Chemical Engineering Yantai UniversityYantai 264005China

Additives could improve composting performance and reduce gaseous emission,but few studies ha.e explored the synergistic of additives on H_(2)S emission and compost *** research aims to make an investigation about the effects of chemical additives and mature compost on H_(2)S emission and compost maturity of kitchen waste *** results showed tha. additives increased the germination index value and H_(2)S emission reduction over 15 days and the treatment with both chemical additives and mature compost achieved highest germination index value and H_(2)S emission reduction(85%).Except for the treatment with only chemical additives,the total sulfur content increased during the kitchen waste *** proportion of effective sulfur was higher with the addition of chemical additives,compared with other *** relative abundance of H_(2)S-formation bacterial(Desulfovibrio)was reduced and the relative abundance of bacterial(Pseudomonas and Paracoccus),which could convert sulfur-containing substances and H_(2)S to sulfate was improved with *** the composting process with both chemical additives and mature compost,the relative abundance of Desulfovibrio was lowest,while the relative abundance of Pseudomonas and Paracoccus was *** together,the chemical additives and mature compost achieved H_(2)S emission reduction by regulating the dynamics of microbial community.

关键词： Kitchen waste composting Sulfur conversion Chemical additives Mature compost Microbial community

Fusion of Convolutional Self-Attention and Cross-Dimensional Feature Transformationfor Human Posture Estimation

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Journal of Beijing Institute of Technology 2024年第4期33卷 346-360页

作者： Anzha. Liu Yilu ding Xiangyang Lu School of ComputerCollege Zhongyuan University of TechnologyZhengzhou451191China School of Electronic and Informa-tion College Zhongyuan University of TechnologyZhengzhou 451191China.

Human posture estimation is a prominent research topic in the fields of human-com-puter interaction,motion recognition,and other intelligent ***,achieving higha.curacy in key point localization,which is crucial for intelligent applications,contradicts the lowdetection accuracy of human posture detection models in practical *** address this issue,a human pose estimation network called AT-HRNet ha. been proposed,which combines convolu-tional self-attention and cross-dimensional feature ***-HRNet captures significantfeature information from various regions in an adaptive manner,aggregating them through convolu-tional operations within the local receptive *** residual structures TripNeck and Trip-Block of the high-resolution network are designed to further refine the key point locations,wherethe attention weight is adjusted by a cross-dimensional interaction to obtain more *** vali-date the effectiveness of this network,AT-HRNet was evaluated using the COCO2017 *** show tha. AT-HRNet outperforms HRNet by improving 3.2%in mAP,4.0%in AP75,and3.9%in AP^(M).This suggests tha. AT-HRNet can offer more beneficial solutions for human posture estimation.

关键词： human posture estimation adaptive fusion method cross-dimensional interaction attention module high-resolution network

A Method for Detecting and Recognizing Yi Cha.acter Based on Deep Learning

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Computers, Materials & Continua 2024年第2期78卷 2721-2739页

作者： ha.peng Sun Xueyan ding Jian Sun HuaYu Jianxin Zha.g School of Computer Science and Engineering Dalian Minzu UniversityDalian116600China Institute of Machine Intelligence and Bio-Computing Dalian Minzu UniversityDalian116600China 3Yi Language Research RoomChina Ethnic Languages Translation Centre Beijing100080China

Aiming at the cha.lenges associated with the absence of a labeled dataset for Yi cha.acters and the complexity of Yi cha.acter detection and recognition,we present a deep learning-based approach for Yi cha.acter detection and *** the detection stage,an improved Differentiable Binarization Network(DBNet)framework is introduced to detect Yi cha.acters,in which the Omni-dimensional Dynamic Convolution(ODConv)is combined with the ResNet-18 feature extraction module to obtain multi-dimensional complementary features,thereby improving the accuracy of Yi cha.acter ***,the feature pyramid network fusion module is used to further extract Yi cha.acter image features,improving target recognition at different ***,the previously generated feature map is passed through a head network to produce two maps:a probability map and an adaptive threshold map of the same size as the original *** maps are then subjected to a differentiable binarization process,resulting in an approximate binarization *** map helps to identify the boundaries of the text ***,the text detection box is generated after the post-processing *** the recognition stage,an improved lightweight MobileNetV3 framework is used to recognize the detect cha.acter regions,where the original Squeeze-and-Excitation(SE)block is replaced by the efficient Shuffle Attention(SA)tha. integrates spatial and cha.nel attention,improving the accuracy of Yi cha.acters ***,the use of depth separable convolution and reversible residual structure can reduce the number of parameters and computation of the model,so tha. the model can better understand the contextual information and improve the accuracy of text *** experimental results illustrate tha. the proposed method achieves good results in detecting and recognizing Yi cha.acters,with detection and recognition accuracy rates of 97.5%and 96.8%,*** also,we ha.e compared the detection and re

关键词： Yi cha.acters text detection text recognition attention mecha.ism deep neural network

Associations of Perchlorate,Nitrate,and Thiocyanate with Sex Hormones among Children:A Nationally Representative Cross-sectional Study in U.S.

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Biomedical and Environmental Sciences 2024年第6期37卷 666-671页

作者： Yiwen Wang Guodong ding Peipei Hu Yongjun Zha.g Department of Pediatrics Xinhua HospitalShanghai Jiao Tong University School of MedicineShanghai 200092China MOE-Sha.gha. Key Laboratory of Children’s Environmental Health Xinhua HospitalShanghai Jiao Tong University School of MedicineShanghai 200092China

Nitrates,thiocyanates,and perchlorates are ubiquitous in the environment and can be introduced to the public through various dietary and environmental ***,thiocyanates,and perchlorates mainly affect health via the sam... 详细信息

关键词： mecha.ism sectional perchlorate

Designing ultrastrong and thermally stable FeCrAl alloys with the fine-grained structure

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Journal of Materials Science & Technology 2024年第4期171卷 198-208页

作者： Shuaiyang Liu Jinyu Zha.g Hui Wang Gang Liu Xiangdong ding Jun Sun State Key Laboratory for Mecha.ical Beha.ior of Materials Xi’an Jiaotong UniversityXi’an 710049China Science and Technology on Reactor Fuel and Materials Laboratory Nuclear Power Institute of ChinaChengdu 610041China

Designing microstructurally stable FeCrAl alloys with excellent strength-ductility synergy is highly desir-able for their engineering ***,due to the preference nucleation of precipitates at grain boundaries(GBs),the improved precipitation strengthening of these alloys is usually accompanied by in-tergranular ***,we propose a novel thermomecha.ical processing route coupled with the Si alloying strategy via precipitation of coherent deformable Laves precipitates inside equiaxed fine-grains to achieve FeCrAl alloys with ultrahigh yield strength over∼992 MPa,excellent uniform elongation of∼7.6%at room temperature,and superior thermal stability at temperature∼1200℃.The Si alloying not only decreases the stacking fault energy of Laves precipitates favorable for their stacking-fault-mediated deformation but also hinders grain coarsening at 1200℃due to the Si-enrichment favorable for GB pin-ning *** results prove the possibility of achieving the collaborative enha.cement of mutually exclusive properties in alloys,such as strength-ductility-thermal stability via nanoprecipitation engineer-ing,and offer a promising route to prepare dispersion-strengthened materials.

关键词： FeCrAl alloys Si alloying Mecha.ical properties Thermal stability Laves pha.e

Next generation multiple access for IMT towards 2030 and beyond

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Science China(Information Sciences) 2024年第6期67卷 448-450页

作者： Zhiguo ding Robert SCHOBER Pingzhi FAN H.Vincent POOR Department of Computer and Information Engineering Khalifa University Department of Electrical and Electronic Engineering University of Manchester Institute for Digital Communications Friedrich Alexander-University Erlangen-Nurnberg (FAU) CSNMT International Cooperation Research Center (MoST) Southwest Jiaotong University Department of Electrical and Computer Engineering Princeton University

Multiple access techniques are fundamental to the design of wireless communication systems,since many crucial components of such systems depend on the choice of the multiple access technique[1].For example,the use of ...

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A Survey on Type-3 Fuzzy Logic Systems and Their Control Applications

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IEEE/CAA Journal of Automatica Sinica 2024年第8期11卷 1744-1756页

作者： Oscar Castillo Fevrier Valdez Patricia Melin Weiping ding Tijuana Institute of Technology/Tecnologico Nacional de Mexico Division of Graduate StudiesCalzada Tecnologico S/NTijuana 22414Mexico School of Information Science and Technology Nantong UniversityJiangsu 226019China

In this paper,we offer a review of type-3 fuzzy logic systems and their applications in *** main objective of this work is to observe and analyze in detail the applications in the control area using type-3 fuzzy logic *** this case,we review their most important applications in control and other related topics with type-3 fuzzy *** algorithms ha.e been receiving increasing attention in control and for this reason a review in this area is *** paper reviews the main applications tha. make use of Intelligent Computing ***,type-3 fuzzy logic *** aim of this research is to be able to appreciate,in detail,the applications in control systems and to point out the scientific trends in the use of Intelligent Computing *** is done with the construction and visualization of bibliometric networks,developed with VosViewer Software,which it is a free Java-based program,mainly intended to be used for analyzing and visualizing bibliometric *** this tool,we can create maps of publications,authors,or journals based on a co-citation network or construct maps of keywords,countries based on a co-occurrence networks,research groups,etc.

关键词： Applications control systems optimization review type-3 fuzzy logic.