检索结果-南通市图书馆

Distributed Sparse Signal Estimation in Sensor Networks Using H_∞-Consensus Filtering

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

IEEE/CAA Journal of Automatica Sinica 2014年第2期1卷 149-154页

作者： haiyang yu Yisha Liu wei wang research center of information and control Dalian University of Technology School of information Science and technology Dalian Maritime University

This paper is concerned with the sparse signal recovery problem in sensor networks, and the main purpose is to design a filter for each sensor node to estimate a sparse signal sequence using the measurements distributed over the whole network. A so-called 1-regularized H_∞filter is established at first by introducing a pseudo-measurement equation, and the necessary and sufficient condition for existence of this filter is derived by means of Krein space Kalman *** embedding a high-pass consensus filter into 1-regularized H∞filter in information form, a distributed filtering algorithm is developed, which ensures that all node filters can reach a consensus on the estimates of sparse signals asymptotically and satisfy the prescribed H∞performance constraint. Finally, a numerical example is provided to demonstrate effectiveness and applicability of the proposed method.

关键词： Kalman filters Sensors Estimation Mathematical model Sparse matrices Covariance matrices

Incidence and prognosis of olfactory and gustatory dysfunctions related to SARS-CoV-2 Omicron strain infection in china:A national multicenter survey of 35,566 individuals

在线全文

学校读者我要写书评

暂无评论

World Journal of Otorhinolaryngology-Head and Neck Surgery 2024年第2期10卷 113-120页

作者： Meng-Fan Liu Rui-Xia Ma Xian-Bao Cao Hua Zhang Shui-Hong Zhou wei-Hong Jiang yan Jiang Jing-Wu Sun Qin-Tai yang Xue-Zhong Li Ya-Nan Sun Li Shi Min wang Xi-Cheng Song Fu-Quan Chen Xiao-Shu Zhang Hong-Quan wei Shao-Qing yu Dong-Dong Zhu Luo Ba Zhi-wei Cao Xu-Ping Xiao Xin wei Zhi-Hong Lin Feng-Hong Chen Chun-guang Shan guang-Ke wang Jing Ye Shen-Hong Qu Chang-Qing Zhao Zhen-Lin wang Hua-Bin Li Feng Liu Xiao-Bo Cui Sheng-Nan Ye Zheng Liu yu Xu Xiao Cai wei Huang Ru-Xin Zhang yu-Lin Zhao guo-Dong yu guang-Gang Shi Mei-Ping Lu yang Shen yu-Tong Zhao Jia-Hong Pei Shao-Bing Xie Long-Gang yu Ye-Hai Liu Shao-wei gu yu-Cheng yang Lei Cheng Jian-Feng liu Graduate School of Beijing university of Chinese Medicine BeijingChina Department of Otorhinolaryngology Head and Neck Surgery China-Japan Friendship HospitalBeijingChina Department of Otorhinolaryngology Head and Neck Surgery The First People's Hospital of YinchuanYinchuanChina Department of Otorhinolaryngology The First People's Hospital of Yunnan ProvinceKunmingChina Department of Otorhinolaryngology The First Affiliated Hospital of Xinjiang Medical UniversityUrumqiChina Department of Otorhinolaryngology Head and Neck Surgery The First Affiliated Hospital of Zhejiang University School of MedicineHangzhouChina Department of Otorhinolaryngology Head and Neck Surgery Xiangya Hospital Central South UniversityChangshaChina Department of Otorhinolaryngology Head and Neck Surgery The Affiliated Hospital of Qingdao UniversityQingdaoChina Department of Otorhinolaryngology Head and Neck Surgery The First Affiliated Hospital of USTCHefeiChina Department of Otorhinolaryngology Head and Neck Surgery The Third Affiliated Hospital of Sun Yat-sen UniversityGuangzhouChina Department of Otorhinolaryngology Head and Neck Surgery Qilu Hospital of Shandong UniversityJinanChina Department of Otorhinolaryngology Head and Neck Surgery The Second Affiliated Hospital of Harbin Medical UniversityHarbinChina Department of Otolaryngology The Second Hospital of Shandong UniversityShandong UniversityJinanChina Department of Otorhinolaryngology Head and Neck Surgery Peking University People's HospitalBeijingChina Department of Otorhinolaryngology Head and Neck Surgery Yantai Yuhuangding HospitalQingdao UniversityYantaiChina Department of Otorhinolaryngology Head and Neck Surgery Xijing HospitalThe Fourth Military Medical UniversityXi'anChina Gansu Provincial center for Disease control and Prevention LanzhouChina Department of Otorhinolaryngology Head and Neck Surgery The First Affiliated Hospital of China Medical UniversityShenyangChina Department of Otorhinolaryngology Head and Neck Surgery Tongji Hospit

Objective:This cross-sectional study aimed to determine the epidemiology of olfactory and gustatory dysfunctions related to COVID-19 in ***:This study was conducted by 45 tertiary Grade-A hospitals in *** and offline questionnaire data were obtained from patients infected with COVID-19 between December 28,2022,and February 21,*** collected information included basic demographics,medical history,smoking and drinking history,vaccination history,changes in olfactory and gustatory functions before and after infection,and other postinfection symptoms,as well as the duration and improvement status of olfactory and gustatory ***:Complete questionnaires were obtained from 35,566 *** overall incidence of olfactory and taste dysfunction was 67.75%.Being female or being a cigarette smoker increased the likelihood of developing olfactory and taste *** received four doses of the vaccine or having good oral health or being a alcohol drinker decreased the risk of such *** infection,the average olfactory and taste VAS scores were 8.41 and 8.51,respectively;after infection,they decreased to 3.69 and 4.29 and recovered to 5.83 and 6.55 by the time of the *** median duration of dysosmia and dysgeusia was 15 and 12 days,respectively,with 0.5%of patients having symptoms lasting for more than 28 *** overall self-reported improvement rate was 59.16%.Recovery was higher in males,never smokers,those who received two or three vaccine doses,and those that had never experienced dental health issues,or chronic accompanying ***:The incidence of dysosmia and dysgeusia following infection with the SARS-CoV-2 virus is high in *** and prognosis are influenced by several factors,including sex,SARS-CoV-2 vaccination,history of head-facial trauma,nasal and oral health status,smoking and drinking history,and the persistence of accompanying symptoms.

关键词： epidemiologic studies incidence olfactory disorders prognosis SARS-CoV-2 taste disorders

A Dynamic Regulation and Scheduling Scheme for Formation control

在线全文

学校读者我要写书评

暂无评论

自动化学报 2007年第6期33卷 628-634页

作者： CHEN yu-Qing zhuang yan wang wei research center of information and control Dalian University of Technology Dalian 116024 P. R. China

这篇文章在某些几何限制在整个他们的旅行在多重活动机器人上被强加的 nonholonomic 限制下面在活动机器人的形成涉及合作控制问题。为这个目的，为形成的运动控制的一个新方法被介绍，它基于动态规定和安排计划。它为它到形成结构的适... 详细信息

这篇文章在某些几何限制在整个他们的旅行在多重活动机器人上被强加的 nonholonomic 限制下面在活动机器人的形成涉及合作控制问题。为这个目的，为形成的运动控制的一个新方法被介绍，它基于动态规定和安排计划。它为它到形成结构的适应性是吸引人的并且需要轨道。形成保留的质量能被形成偏移量和间距距离的即时错误评估。一些 kinematics 法律被开发调整并且维持形成形状。模拟结果和数据分析为一组机器人显示出建议途径的有效性。

关键词：合作控制移动式遥控装置几何约束动态调节不完全约束队形保持时序调度

A Near Optimal Power Allocation Scheme for Cooperative Relay Networking with NOMA

在线全文

学校读者我要写书评

暂无评论

china Communications 2019年第3期16卷 122-131页

作者： haiyang yu wei Duan guoan Zhang yancheng Ji Xiaojun Zhu Jaeho Choi The School of Electronics and information Nantong University Division of Electronics and information Engineering Chonbuk National University Department of ECE CAIIT Chonbuk National University

In this paper, we propose cooperative relay networks with non-orthogonal multiple access in order to design a near-optimal power allocation strategy. Like other next generation wireless technologies, spatially multiplexed transmissions are achieved by relay nodes which enables decode-and-forward relaying of a new superposition code after reception from the source. It is worth noting that, since it is hard to exactly prove the proposed PA scheme, due the fact that it is one kind of the approximate conjectures. Therefore, mathematical and numerical methods have been used to clarify the feasibility of the proposal. Numerical results indicate that it is able to asymptotically achieve the optimal sum rate at the higher signal-to-noise ratio region with the proposed strategy applied instead of negligible performance loss.

关键词： non-orthogonal multiple access cooperative multi-relay networks decode-and-forward two-stage power allocation

Treatment-seeking behaviour and barriers to service access for sexually transmitted diseases among men who have sex with men in china:a multicentre cross-sectional survey

在线全文

学校读者我要写书评

暂无评论

Infectious Diseases of Poverty 2017年第1期6卷 118-127页

作者： Jun-Jie Xu yan-Qiu yu Qing-Hai Hu Hong-Jing yan Zhe wang Lin Lu Ming-Hua zhuang Xi Chen Ji-Hua Fu wei-Ming Tang Wen-Qing Geng Yong-Jun Jiang Hong Shang Key Laboratory of AIDS Immunology of National Health and Family Planning Commission Department of Laboratory MedicineThe First Affiliated HospitalChina Medical UniversityShenyangChina Collaborative Innovation center for Diagnosis and Treatment of Infectious Diseases HangzhouChina Jiangsu Provincial centers for Disease control and Prevention NanjingChina He’nan Provincial centers for Disease control and Prevention ZhengzhouChina yunnan Provincial centers for Disease control and Prevention KunmingChina Shanghai Municipal centers for Disease control and Prevention ShanghaiChina Hu’nan Provincial centers for Disease control and Prevention ChangshaChina Shandong Provincial centers for Disease control and Prevention JinanChina university of North Carolina Project-china GuangzhouChina

Background:Delayed or inappropriate treatment for sexually transmitted diseases(STDs)increases the risk of HIV acquisition and may cause other harmful ***,studies on STD treatment-seeking behaviour and correlated factors in men who have sex with men(MSM)are *** information is crucial for the promotion of STD treatment-seeking behaviour and reduction of HIV transmission among Chinese ***:During 2012-2013,a multicentre cross-sectional study was conducted in 7 Chinese *** completed an interview-questionnaire and gave venous blood samples,which were then tested for antibodies to HIV,syphilis,and herpes simplex virus-2(HSV-2).MSM who tested positive for syphilis/HSV-2 or had obvious STD-related symptoms within the last 12 months were defined as suspected STD-infected ***:Of the 4496 eligible MSM who completed this survey,24.4%(1096/4496)were categorized as suspected STD-infected MSM.35.7%(391/1096)of these MSM with suspected STD infections sought STD treatment in clinics within the last 12 *** MSM who did not attend STD clinics for treatment,the prevalence of syphilis and HSV-2 was significantly higher;the HIV prevalence and incidence within this subpopulation reached as high as 14.5%and 12.2/100 person-years,*** logistic regression analysis indicated that having 7-12 years of education(vs.≤6 years;aOR,2.5;95%CI,1.0-6.1),≥13 years of education(vs.≤6 years:aOR,2.8;95%CI,1.2-7.0),monthly income>500 USD(vs.≤500 USD:aOR,1.5;95%CI,1.1-2.1),obvious STD-related symptoms within last 12 months(aOR,5.3;95%CI,3.7-7.5),being HIV infected(aOR,1.7;95%CI,1.1-2.6),currently syphilis infected(aOR,0.6;95%CI,0.4-0.9)and HSV-2 infected(aOR,0.6;95%CI,0.5-0.9)were independent correlates with seeking STD treatment in clinics among Chinese ***:The high prevalence of STD infection coupled with a low proportion of individuals who exhibit appropriate treatment-seeking behaviour create a high risk of a g

关键词： Sexually transmitted diseases(STDs) Men who have sex with men(MSM) Treatment-seeking behaviour HIV china

Ensemble learning prediction of soybean yields in china based on meteorological data

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

农业科学学报:英文版 2023年第6期22卷 1909-1927页

作者： LI Qian-chuan XU Shi-wei zhuang Jia-yu LIU Jia-jia ZHOU Yi ZHANG Ze-xi Agricultural information Institute Chinese Academy of Agricultural SciencesBeijing 100081P.R.China Beijing Engineering research center for Agricultural Monitoring and Early Warning Beijing 100081P.R.China Aerospace information research Institute Chinese Academy of SciencesBeijing 100094P.R.China The Department of Mathematics Columbia UniversityNY 10027USA Key Laboratory of Agricultural Monitoring and Early Warning technology Ministry of Agriculture and Rural AffairsBeijing 100081P.R.China

The accurate prediction of soybean yield is of great significance for agricultural production, monitoring and early *** previous studies have used machine learning algorithms to predict soybean yield based on meteorological data,it is not clear how different models can be used to effectively separate soybean meteorological yield from soybean yield in various regions. In addition, comprehensively integrating the advantages of various machine learning algorithms to improve the prediction accuracy through ensemble learning algorithms has not been studied in depth. This study used and analyzed various daily meteorological data and soybean yield data from 173 county-level administrative regions and meteorological stations in two principal soybean planting areas in china(Northeast china and the Huang–Huai region), covering 34 *** effective machine learning algorithms(K-nearest neighbor, random forest, and support vector regression) were adopted as the base-models to establish a high-precision and highly-reliable soybean meteorological yield prediction model based on the stacking ensemble learning framework. The model's generalizability was further improved through 5-fold crossvalidation, and the model was optimized by principal component analysis and hyperparametric optimization. The accuracy of the model was evaluated by using the five-year sliding prediction and four regression indicators of the 173 counties, which showed that the stacking model has higher accuracy and stronger robustness. The 5-year sliding estimations of soybean yield based on the stacking model in 173 counties showed that the prediction effect can reflect the spatiotemporal distribution of soybean yield in detail, and the mean absolute percentage error(MAPE) was less than 5%. The stacking prediction model of soybean meteorological yield provides a new approach for accurately predicting soybean yield.

关键词： meteorological factors ensemble learning crop yield prediction machine learning county-level

PdAg bimetallic electrocatalyst for highly selective reduction of CO2 with low COOH^* formation energy and facile CO desorption

在线全文

学校读者我要写书评

暂无评论

Nano research 2019年第11期12卷 2866-2871页

作者： Rui Lin Xuelu Ma Weng-Chon Cheong Chao Zhang wei Zhu Jiajing Pei Kaiyue Zhang Bin wang Shiyou Liang yuxi Liu Zhongbin zhuang Rong yu Hai Xiao Jun Li Dingsheng wang Qing Peng Chen Chen Yadong Li Department of Chemistry Tsinghua UniversityBeijing100084China School of Chemical&Environment Engineering China University of Mining&TechnologyBeijing100083China College of Chemical Engineering Beijing University of Chemical TechnologyBeijing100029China College of Environmental and Energy Engineering Beijing University of TechnologyBeijing100124China Sinopec Beijing research Institute of Chemical Industry Beijing100013China School of Materials Science and Engineering National Center for Electron Microscopy in BeijingTsinghua UniversityBeijing100084China

For electrocatalytic reduction of CO2 to CO,the stabilization of intermediate COOH^* and the desorption of CO^* are two key *** can easily stabilize COOH^*,whereas the strong CO^* binding to Pd surface results in severe poisoning,thus lowering catalytic activity and stability for CO2 *** Ag surface,CO^* desorbs readily,while COOH^* requires a relatively high formation energy,leading to a high *** light of the above issues,we successfully designed the PdAg bimetallic catalyst to circumvent the drawbacks of sole Pd and *** PdAg catalyst with Ag-terminated surface not only shows a much lower overpotential(-0.55 V with CO current density of 1 mA/cm^2)than Ag(−0.76 V),but also delivers a CO/H2 ratio 18 times as high as that for Pd at the potential of-0.75 V *** issue of CO poisoning is significantly alleviated on Ag-terminated PdAg surface,with the stability well retained after 4h electrolysis at-0.75 V *** functional theory(DFT)calculations reveal that the Ag-terminated PdAg surface features a lowered formation energy for COOH^* and weakened adsorption for CO^*,which both contribute to the enhanced performance for CO2 reduction.

关键词： CO2 reduction bimetallic low overpotential CO desorption

Growth of high quality InSb thin films on GaAs substrates by molecular beam epitaxy method with AlInSb/GaSb as compound buffer layers

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Physics B 2021年第2期30卷 573-577页

作者： Yong Li Xiao-Ming Li Rui-Ting Hao Jie guo yu zhuang Su-Ning Cui guo-Shuai wei Xiao-Le Ma guo-wei wang Ying-Qiang Xu Zhi-Chuan Niu Yao wang School of Energy and Environment Science Key Laboratory of Renewable Energy Advanced Materials and Manufacturing Technology of the Ministry of EducationYunnan Normal UniversityKunming 650092China Key Laboratory for SLs and Microstructures Institute of SemiconductorsChinese Academy of SciencesBeijing 100083China Synergetic Innovation center of Quantum information and Quantum Physics University of Science and Technology of ChinaHefei 230026China National center for International research on Green Optoelectronics Guangdong Provincial Key Laboratory of Optical Information Materials and TechnologyInstitute of Electronic Paper DisplaysSouth China Academy of Advanced OptoelectronicsSouth China Normal UniversityGuangzhou 510006China

A series of In Sb thin films were grown on Ga As substrates by molecular beam epitaxy(MBE).Ga Sb/Al In Sb is used as a compound buffer layer to release the strain caused by the lattice mismatch between the substrate and the epitaxial layer,so as to reduce the system *** the same time,the influence of different interface structures of Al In Sb on the surface morphology of buffer layer is *** propagation mechanism of defects with the growth of buffer layer is compared and *** relationship between the quality of In Sb thin films and the structure of buffer layer is ***,the growth of high quality In Sb thin films is realized.

关键词： compound buffers AlInSb/GaSb defect inhibition InSb molecular beam epitaxy(MBE)

在线全文

学校读者我要写书评

暂无评论

广西甘蔗碳汇测算方法研究及时空格局分析

广西大学学报（自然科学版） 2024年第2期49卷 429-438页

作者：韦增欣余家佳穆琳佘乾仲袁功林广西大学数学与信息科学学院广西南宁530004 广西应用数学中心(广西大学) 广西南宁530004 广西民族大学相思湖学院广西南宁530025 湖南智碳能源科技有限公司湖南长沙410000 广西大学经济学院广西南宁530004 广西昂晟节能科技有限公司广西南宁530010

为了实现广西全区植被减源增汇目标,对广西主要经济作物甘蔗的碳吸收和碳排放量进行科学的测算,并开展甘蔗碳汇时空格局的研究分析;利用广西全区14个地级市2010—2020年甘蔗产量、农资投入等相关统计数据测算广西全区甘蔗净碳汇量,并运... 详细信息

为了实现广西全区植被减源增汇目标,对广西主要经济作物甘蔗的碳吸收和碳排放量进行科学的测算,并开展甘蔗碳汇时空格局的研究分析;利用广西全区14个地级市2010—2020年甘蔗产量、农资投入等相关统计数据测算广西全区甘蔗净碳汇量,并运用空间自相关分析法分析2005—2020年间广西各市时空分布格局。结果表明:2010—2020年,广西全区甘蔗净碳汇量逐步上升;2005—2020年,广西全区甘蔗碳汇量在地级市尺度下不存在明显的全局空间自相关关系;广西全区甘蔗碳汇量逐步形成以南宁市为核心的局部溢出格局,充分利用南宁市的技术、产业优势扩大甘蔗碳汇的空间溢出效应,对提高广西全区的甘蔗碳汇水平至关重要。

关键词：甘蔗碳吸收碳排放净碳汇量