检索结果-南通市图书馆

Digital twins in smart farming:An autoware-based simulator for autonomous agricultural vehicles

在线全文

学校读者我要写书评

暂无评论

international Journal of Agricultural and Biological Engineering 2023年第4期16卷 184-189页

作者： Xin Zhao Wanli Wang Long Wen Zhibo Chen Sixian Wu Kun Zhou Mengyao Sun Lanjun Xu Bingbing Hu Caicong Wu College of Information and Electrical Engineering China Agricultural UniversityBeijing 100083China Key laboratory of Agricultural Machinery Monitoring and Big Data Application Ministry of Agriculture and Rural AffairsBeijing 100083China The Bureau of Agriculture and Rural Affairs of Urumchi Xinjiang Uygur Autonomous RegionUrumchi 830000China research&Advanced Engineering AGCO A/SDK-8930 RandersDenmark Beijing Agricultural Machinery Experiment Appraisal Extension Station Beijing 100079China Kunlun Beidou Intelligence Technologies Co.Ltd. Beijing 102200China

Digital twins can improve the level of control over physical entities and help manage complex systems by integrating a range of *** autonomous agricultural machine has shown revolutionary effects on labor reduction and utilization rate in field *** vehicles in precision agriculture have the potential to improve competitiveness compared to current crop production methods and have become a research ***,the development time and resources required in experiments have limited the research in this *** tools in unmanned farming that are required to enable more efficient,reliable,and safe autonomy are increasingly *** by the recent development of an open-source virtual simulation platform,this study proposed an autoware-based simulator to evaluate the performance of agricultural machine guidance based on digital *** photogrammetry using drones is used to construct threedimensional maps of fields at the same scale as reality.A communication format suitable for agricultural machines was developed for data input and output,along with an inter-node communication *** conversion,publishing,and maintenance of multiple coordinate systems were completed based on ROS(Robot Operating System).Coverage path planning was performed using hybrid curves based on Bézier curves,and it was tested in both a simulation environment and actual fields with the aid of Pure Pursuit algorithms and PID controllers.

关键词： autoware simulation platform autonomous agricultural vehicle digital twin autonomous robots

New development thoughts on the bio-inspired intelligence based control for unmanned combat aerial vehicle

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Science China(Technological Sciences) 2010年第8期53卷 2025-2031页

作者： DUAN HaiBin 1 ,SHAO Shan 2 ,SU BingWei 3 &ZHANG Lei 41 State Key laboratory of Science and Technology on Holistic Flight Control,School of Automation Science and Electrical Engineering, Beijing University of Aeronautics and Astronautics,Beijing 100191,China 2 Flight Control Department,Shenyang Aircraft Design and research Institute,Shenyang 110035,China 3 Beijing Institute of Near Space Vehicle’s System Engineering,Beijing 100076,China 4Integration and Project Section,Air Force Equipment Academy,Beijing 100085,China State Key laboratory of Science and Technology on Holistic Flight Control School of Automation Science and Electrical Engineering Beijing University of Aeronautics and Astronautics Flight Control Department Shenyang Aircraft Design and Research Instit

Bio-inspired intelligence is in the spotlight in the field of international artificial intelligence,and unmanned combat aerial vehicle(UCAV),owing to its potential to perform dangerous,repetitive tasks in remote and hazardous,is very promising for the technological leadership of the nation and essential for improving the security of *** the basis of introduction of bioinspired intelligence and UCAV,a series of new development thoughts on UCAV control are proposed,including artificial brain based high-level autonomous control for UCAV,swarm intelligence based cooperative control for multiple UCAVs,hy-brid swarm intelligence and Bayesian network based situation assessment under complicated combating environments, bio-inspired hardware based high-level autonomous control for UCAV,and meta-heuristic intelligence based heterogeneous cooperative control for multiple UCAVs and unmanned combat ground vehicles(UCGVs).The exact realization of the proposed new development thoughts can enhance the effectiveness of combat,while provide a series of novel breakthroughs for the intelligence,integration and advancement of future UCAV systems.

关键词： bio-inspired intelligence unmanned combat aerial vehicle(UCAV) artificial brain autonomous control bayesian network bio-inspired hardware heterogeneous cooperative control

Multispectral imaging systems for airborne remote sensing to support agricultural production management

在线全文

学校读者我要写书评

暂无评论

international Journal of Agricultural and Biological Engineering 2010年第1期3卷 50-62页

作者： Yanbo Huang Steven J.Thomson Yubin Lan Stephan J.Maas USDA-ARS Crop Production systems research Unit StonevilleMS 38776USA USDA ARS Areawide Pest Management research Unit College StationTX 77845USA Texas Tech University LubbockTX 79409USA

This study investigated three different types of multispectral imaging systems for airborne remote sensing to support management in agricultural application and *** three systems have been used in agricultural *** range from low-cost to relatively high-cost,manually operated to automated,multispectral composite imaging with a single camera and integrated imaging with custom-mounting of separate *** issues regarding use of the imaging systems were described and *** low-cost system,due to band saturation,slow imaging speed and poor image quality,is more preferable to slower moving platforms that can fly close to the ground,such as unmanned autonomous helicopters,but not recommended for low or high altitude aerial remote sensing on fixed-wing *** the restriction on payload unmanned autonomous helicopters are not recommended for high-cost systems because they are typically heavy and difficult to *** system with intermediate cost works well for low altitude aerial remote sensing on fixed-wing aircraft with field shapefile-based global positioning *** system also works well for high altitude aerial remote sensing on fixed-wing aircraft with global positioning triggering or manually *** custom-built system is recommended for high altitude aerial remote sensing on fixed-wing aircraft with waypoint global positioning triggering or manually operated.

关键词： airborne remote sensing multispectral imaging agricultural production management

Extracting Depth Information Using a Correlation Matching Algorithm

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Software Engineering and Applications 2012年第5期5卷 304-313页

作者： Mahmoud Abdelhamid Jeffery Beers Mohammed Omar Clemson University international Center for Automotive research CU-ICAR Greenville USA.

This manuscript presents a modified algorithm to extract depth information from stereo-vision acquisitions using a correlation based approaches. The main implementation of the proposed method is in the area of autonomous Pick & Place, using a robotic manipulator. Current vision-guided robotics is still based on a priori training and teaching steps, and still suffers from long response time. This study uses a stereo triangulation setup where two Charged Coupled Devices CCDs are arranged to acquire the scene from two different perspectives. The study discusses the details to calculate the depth using a correlation matching routine which programmed using a Square Sum Difference SSD algorithm to search for the corresponding points from the left and the right images. The SSD is further modified using an adjustable Region Of Interest ROI along with a center of gravity based calculations. Furthermore, the two perspective images are rectified to reduce the required processing time. The reported error in depth using the modified SSD method is found to be around 1.2 mm.

关键词： Stereo-Vision Depth Passive Triangulation Pick and Place

A Survey on an Emerging Safety Challenge for autonomous Vehicles:Safety of the Intended Functionality

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Engineering 2024年第2期33卷 17-34页

作者： Hong Wang Wenbo Shao Chen Sun Kai Yang Dongpu Cao Jun Li Tsinghua Intelligent Vehicle Design and Safety research Institute School of Vehicle and MobilityTsinghua UniversityBeijing 100084China CogDrive Lab Department of Mechanical and Mechatronics EngineeringUniversity of WaterlooWaterlooON N2L3G1Canada College of Mechanical and Vehicle Engineering Chongqing UniversityChongqing 400044China

As the complexity of autonomous vehicles(AVs)continues to increase and artificial intelligence algorithms are becoming increasingly ubiquitous,a novel safety concern known as the safety of the intended functionality(SOTIF)has emerged,presenting significant challenges to the widespread deployment of *** focuses on issues arising from the functional insufficiencies of the AVs’intended functionality or its implementation,apart from conventional safety *** the systems engineering standpoint,this study offers a comprehensive exploration of the SOTIF landscape by reviewing academic research,practical activities,challenges,and perspectives across the development,verification,validation,and operation *** research encompasses system-level SOTIF studies and algorithm-related SOTIF issues and ***,it encapsulates practical SOTIF activities undertaken by corporations,government entities,and academic institutions spanning international and Chinese contexts,focusing on the overarching methodologies and practices in different ***,the paper presents future challenges and outlook pertaining to the development,verification,validation,and operation phases,motivating stakeholders to address the remaining obstacles and challenges.

关键词： Safety of the intended functionality autonomous vehicles Artificial intelligence Uncertainty Verification Validation

Wave and Current Effects on Floating Fish Farms

在线全文

学校读者我要写书评

暂无评论

Journal of Marine Science and Application 2018年第3期17卷 284-296页

作者： Odd M.Faltinsen Yugao Shen Department of Marine Technology Norwegian University of Science and Technology (NTNU)NO-7491 TrondheimNorway Center for autonomous Marine Operations and systems (AMOS) Norwegian University of Science and Technology (NTNU) NO-7491 TrondheimNorway

The paper is partly a review on hydrodynamic and structural aspects of fish farms. In addition, new numerical results are presented on the stochastic behavior of bending stresses in the floater of a realistic net cage in extreme wave conditions. The behavior of traditional-type fish farms with net cages and closed fish farms in waves and currents is discussed. Hydroelasticity can play a significant role for net cages and closed membrane-type fish farms. The many meshes in a net cage make CFD and complete structural modeling impracticable. As an example, a hydrodynamic screen model and structural truss elements are instead used to represent the hydrodynamic loading and the structural deformation of the net. In addition, the wake inside the net due to current plays an important role. The described simplified numerical method has been validated by comparing with model tests of mooring loads on a single net cage with two circular elastic floaters and bottom weight ring in waves and currents. It is discussed which parts of the complete system play the most important roles in accurately determining the mooring loads. Many realizations of a sea state are needed to obtain reliable estimates of extreme values in a stochastic sea. In reality, many net cages operate in close vicinity, which raises questions about spatial variations of the current and wave environment as well as hydrodynamic interaction between the net cages. Live fish touching the netting can have a non-negligible influence on the mooring loads. It is demonstrated by numerical calculations in waves and currents that a well boat at a net cage can have a significant influence on the mooring loads and the bending stresses in the floater. The latter results provide a rational way to obtain operational limits for a well boat at a fish farm. Sloshing has to be accounted for in describing the behavior of a closed fish farm when important wave frequencies are in the vicinity of natural sloshing frequencies. The struct

关键词： Wave Current Aquaculture Net cage Closed fish farm

Twenty years of ocean observations with China Argo

在线全文

学校读者我要写书评

暂无评论

Acta Oceanologica Sinica 2023年第2期42卷 1-16页

作者： Zenghong Liu Xiaogang Xing Zhaohui Chen Shaolei Lu Xiaofen Wu Hong Li Chunling Zhang Lijing Cheng Zhaoqin Li Chaohui Sun Jianping Xu Dake Chen Fei Chai State Key laboratory of Satellite Ocean Environment Dynamics Second Institute of OceanographyMinistry of Natural ResourcesHangzhou310012China Observation and research Station of Global Ocean Argo System(Hangzhou) Ministry of Natural ResourcesHangzhou310012China Frontier Science Center for Deep Ocean Multispheres and Earth System/Key laboratory of Physical Oceanography Ocean University of ChinaQingdao266100China Department of Atmospheric and Oceanic Sciences/Institute of Atmospheric Sciences Fudan UniversityShanghai200438China College of Marine Sciences Shanghai Ocean UniversityShanghai201306China international Center for Climate and Environment Sciences Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing100029China

The international Argo program,a global observational array of nearly 4000 autonomous profiling floats initiated in the late 1990s,which measures the water temperature and salinity of the upper 2000 m of the global ocean,has revolutionized *** has been recognized one of the most successful ocean observation systems in the ***,the proposed decade action“OneArgo”for building an integrated global,full-depth,and multidisciplinary ocean observing array for beyond 2020 has been *** the past two decades since 2002,with more than 500 Argo deployments and 80 operational floats currently,China has become an important partner of the Argo *** DACs have been established to process the data reported from all Chinese floats and deliver these data to the GDACs in real time,adhering to the unified quality control procedures proposed by the Argo Data Management *** Argo products have been developed and released,allowing accurate estimations of global ocean warming,sea level change and the hydrological cycle,at interannual to decadal *** addition,Deep and BGC-Argo floats have been deployed,and time series observations from these floats have proven to be extremely useful,particularly in the analysis of synoptic-scale to decadal-scale *** future aim of China Argo is to build and maintain a regional Argo fleet comprising approximately 400 floats in the northwestern Pacific,South China Sea,and Indian Ocean,accounting for 9%of the global fleet,in addition to maintaining 300 Deep Argo floats in the global ocean(25%of the global Deep Argo fleet).A regional BGC-Argo array in the western Pacific also needs to be established and maintained.

关键词： Argo program China Argo ocean observation core Argo Deep Argo BGC-Argo

Leveraging Human-AI Collaboration in Crowd-Powered Source Search:A Preliminary Study

在线全文

学校读者我要写书评

暂无评论

Journal of Social Computing 2023年第2期4卷 95-111页

作者： Yong Zhao Zhengqiu Zhu Bin Chen Sihang Qiu the College of systems Engineering National University of Defense TechnologyChangsha 430000China

Source search is an important problem in our society,relating to finding fire sources,gas sources,or signal ***,in an unexplored and potentially dangerous environment,an autonomous source search algorithm that employs robotic searchers is usually applied to address the *** environments could be completely unknown and highly ***,novel search algorithms have been designed,combining heuristic methods and intelligent optimization,to tackle search problems in large and complex search ***,these intelligent search algorithms were not designed to address completeness and optimality,and therefore commonly suffer from the problems such as local optimums or endless *** studies have used crowd-powered systems to address the complex problems that cannot be solved by machines on their *** leveraging human intelligence in an AI system has been shown to be effective in making the system more reliable,whether using the power of the crowd can improve autonomous source search algorithms remains *** this end,we propose a crowd-powered source search approach enabling human-AI collaboration,which uses human intelligence as external supports to improve existing search algorithms and meanwhile reduces human efforts using AI ***,we designed a crowd-powered prototype system and carried out an experiment with both experts and non-experts,to complete 200 source search scenarios(704 crowdsourcing tasks).Quantitative and qualitative analysis showed that the sourcing search algorithm enhanced by crowd could achieve both high effectiveness and *** work provides valuable insights in human-AI collaborative system design.

关键词： source search crowdsourcing crowd-powered systems crowd computing

Intelligent and connected vehicles： Current status and future perspectives

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Science China(Technological Sciences) 2018年第10期61卷 1446-1471页

作者： YANG DianGe JIANG Kun ZHAO Ding YU ChunLei CAO Zhong XIE ShiChao XIAO ZhongYang JIAO XinYu WANG SiJia ZHANG Kai State Key laboratory of Automotive Safety and Energy Department of Automotive Engineering Collaborative Innovation Center of Intelligent New Energy Vehicle Tsinghua University Beijing 100084 China University of Michigan Transportation research Institute Ann Arbor MI 48109 USA

Intelligent connected vehicles(ICVs) are believed to change people's life in the near future by making the transportation safer,cleaner and more comfortable. Although many prototypes of ICVs have been developed to prove the concept of autonomous driving and the feasibility of improving traffic efficiency, there still exists a significant gap before achieving mass production of high-level ICVs. The objective of this study is to present an overview of both the state of the art and future perspectives of key technologies that are needed for future ICVs. It is a challenging task to review all related works and predict their future perspectives, especially for such a complex and interdisciplinary area of research. This article is organized to overview the ICV key technologies by answering three questions: what are the milestones in the history of ICVs; what are the electronic components needed for building an ICV platform; and what are the essential algorithms to enable intelligent driving? To answer the first question, the article has reviewed the history and the development milestones of ICVs. For the second question, the recent technology advances in electrical/electronic architecture, sensors, and actuators are presented. For the third question, the article focuses on the algorithms in decision making, as the perception and control algorithm are covered in the development of sensors and actuators. To achieve correct decision-making, there exist two different approaches: the principle-based approach and data-driven approach. The advantages and limitations of both approaches are explained and analyzed. Currently automotive engineers are concerned more with the vehicle platform technology, whereas the academic researchers prefer to focus on theoretical algorithms. However, only by incorporating elements from both worlds can we accelerate the production of high-level ICVs.

关键词： intelligent connected vehicle (ICV) autonomous driving artificial intelligence advanced driver assistance systems(ADAS) electrical/electronic architecture (EEA) environmental perception decision-making ICV computation platform