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Agent-based model of land system:Theory,application and modelling framework

Journal of Geographical Sciences 2020年第10期30卷 1555-1570页

作者： DAI Erfu MA Liang YANG Weishi WANG Yahui YIN Le TONG Miao Lhasa Plateau Ecosystem research Station Key Laboratory of Ecosystem Network Observation and ModelingInstitute of Geographic Sciences and Natural Resources ResearchCASBeijing 100101China Key laboratory of Land Surface Pattern and Simulation Institute of Geographic Sciences and Natural Resources ResearchCASBeijing 100101China University of Chinese Academy of Sciences Beijing 100049China School of Geography and Planning Sun Yat-Sen UniversityGuangzhou 510275China

Land change science has become an interdisciplinary research direction for understanding human-natural coupling *** a process-oriented modelling approach,agent based model(ABM)plays an important role in revealing the driving forces of land change and understanding the process of land *** paper starts from three aspects:The theory,application and modeling framework of ***,we summarize the theoretical basis of ABM and introduce some related *** we expound the application and development of ABM in both urban land systems and agricultural land systems,and further introduce the case study of a model on Grain for Green Program in Hengduan Mountainous region,*** the basis of combing the ABM modeling protocol,we propose the land system ABM modeling framework and process from the perspective of *** terms of urban land use,ABM research initially focused on the study of urban expansion based on landscape,then expanded to issues like urban residential separation,planning and zoning,ecological functions,*** terms of agricultural land use,ABM application presents more diverse and individualized *** topics include farmers’behavior,farmers’decision-making,planting systems,agricultural policy,*** to traditional models,ABM is more complex and difficult to generalize beyond specific context since it relies on local knowledge and ***,due to its unique bottom-up model structure,ABM has an indispensable role in exploring the driving forces of land change and also the impact of human behavior on the environment.

关键词： land system land use land change science land change model agent-based model modeling framework

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A Survey on Channel Measurements and Models for Underground MIMO Communication Systems

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China Communications 2023年第8期20卷 103-119页

作者： Asad Saleem Yejun He Guoxin Zheng Zhining Chen State Key laboratory of Radio Frequency Heterogeneous Integration Guangdong Engineering Research Center of Base Station Antennas and PropagationShenzhen Key Laboratory of Antennas and PropagationCollege of Electronics and Information EngineeringShenzhen UniversityShenzhen 518060China Key laboratory of Specialty Fiber Optics and Optical Access Networks Shanghai UniversityShanghai 200444China Department of Electrical and Computer Engineering National University of SingaporeSingapore

The high reliability of the communication system is critical in metro and mining applications for personal safety,channel optimization,and improving operational *** paper surveys the progress of wireless communication systems in underground environments such as tunnels and mines from 1920 to 2022,including the evolution of primitive technology,advancements in channel modelling,and realization of various wireless propagation *** addition,the existing and advanced channel modeling strategies,which include the evolution of different technologies and their applications;mathematical,analytical,and experimental techniques for radio propagation;and significance of the radiation characteristics,antenna placement,and physical environment of multiple-input multiple-output(MIMO)communication systems,are *** given study introduces leaky coaxial cable(LCX)and distributed antenna system(DAS)designs for improving narrowband and wideband channel *** paper concludes by figuring out open research areas for the future technologies.

关键词： leaky coaxial cable(LCX) long-term evolution for metro(LTE-M) multiple-input multipleoutput(MIMO)systems propagation modeling

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Sensitivity Analysis of Thermal Equilibrium Parameters of MIKE 11 Model:A Case Study of Wuxikou Reservoir in Jiangxi Province of China

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Chinese Geographical Science 2013年第5期23卷 584-593页

作者： WANG Qinggai ZHAO Xiaohong CHEN Kaiqi LIANG Peng LI Shibei State environmental Protection Key laboratory of Numerical modeling for environment Impact Assessment Appraisal Center for Environment and EngineeringMinistry of Environmental Protection

Sensitivity analysis of thermal equilibrium parameters in the reservoir module of MIKE 11 model was conducted for the Wuxikou Reservoir in Jiangxi Province of China in order to apply the module to the environmental impact assessment to accurately predict water temperature of *** showed that radiation parameter A and evaporation-first parameter were much more sensitive than other *** values of the radiation parameter A ranged from 0.10 to *** values of evaporation-first parameter varied from 0 to *** sensitivity of solar absorption parameters was less than that of evaporation parameter,of which light attenuation values ranged from 0.5 to 0.7,and this parameter would not impact model results if it was more than *** in Beer's law ranged from 0.2 to *** parameter B was not more sensitive than evaporation parameter and its reasonable range was higher than *** fitting curves showed consistent changing tendency for these parameters within the reasonable ***,all the thermal equilibrium parameters had much more important effects on surface water temperature than deep water ***,if no observed data could be obtained,the local empirical value would be used to input to the MIKE 11 model to simulate the changes in the discharged outflow-water temperature qualitatively.

关键词： MIKE 11 model thermal equilibrium parameters discharged outflow-water temperature sensitivity analysis temperature difference

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Variation characteristics of atmospheric methane and carbon dioxide in summertime at a coastal site in the South China Sea

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Frontiers of environmental Science & Engineering 2022年第11期16卷 165-175页

作者： Yangyan Cheng Ye Shan Yuhuan Xue Yujiao Zhu Xinfeng Wang Likun Xue Yanguang Liu Fangli Qiao Min Zhang Key laboratory of Marine Sciences and Numerical modeling First Institute of OceanographyMinistry of Natural ResourcesQingdao 266061China laboratory for Regional Oceanography and Numerical modeling Pilot National Laboratory for Marine Science and Technology(Qingdao)Qingdao 266237China environment research Institute Shandong UniversityQingdao 266237China Key laboratory of Marine Geology and Metallogeny First Institute of OceanographyMinistry of Natural ResourcesQingdao 266061China Shandong Key laboratory of Marine Sciences and Numerical modeling Qingdao 266061China

Methane(CH_(4))and carbon dioxide(CO_(2))are the two most important greenhouse gases(GHGs).To examine the variation characteristics of CH_(4)and CO_(2)in the coastal South China Sea,atmospheric CH_(4)and CO_(2)measurements were performed in Bohe(BH),Guangdong,China,in summer *** using an adaptive data analysis method,the diurnal patterns of CH_(4)and CO_(2)were clearly extracted and analysed in relation to the sea breeze(SB)and land breeze(LB),*** average concentrations of CH_(4)and CO_(2)were 1876.91±31.13 ppb and 407.99±4.24 ppm during SB,and 1988.12±109.92 ppb and 421.54±14.89 ppm during LB,*** values of CH_(4)and CO_(2)during SB basically coincided with the values and trends of marine background sites,showing that the BH station could serve as an ideal site for background GHG monitoring and dynamic *** extracted diurnal variations in CH_(4)and CO_(2)showed sunrise high and sunset low patterns(with peaks at 5:00–7:00)during LB but mid-morning high and evening low patterns(with peaks at 9:00)during *** diurnal amplitude changes in both CH_(4)and CO_(2)during LB were almost two to three times those during *** direction significantly modulated the diurnal variations in CH_(4)and CO_(2).The results in this study provide a new way to examine the variations in GHGs on different timescales and can also help us gain a better understanding of GHG sources and distributions in the South China Sea.

关键词： Methane Carbon dioxide Diurnal pattern Ensemble empirical mode decomposition South China Sea Sea breeze

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Towards 6G: Paradigm of Realistic Terahertz Channel modeling

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China Communications 2021年第5期18卷 1-18页

作者： Ke Guan Haofan Yi Danping He Bo Ai Zhangdui Zhong State Key laboratory of Rail Traffic Control and Safety Beijing Jiaotong UniversityBeijing 100044China Beijing Engineering research Center of High-speed Railway Broadband Mobile Communications Beijing 100044China

Terahertz(THz)communications are envisioned as a key technology for the sixth-generation wireless communication system(6G).However,it is not practical to perform large-scale channel measurements with high degrees of freedom at THz frequency *** makes empirical or stochastic modeling approaches relying on measurements no longer *** order to break through the bottleneck of scarce fulldimensional channel sounding measurements,this paper presents a novel paradigm for THz channel modeling towards *** the core of high-performance ray tracing(RT),the presented paradigm requires merely quite limited channel sounding to calibrate the geometry and material electromagnetic(EM)properties of the three-dimensional(3D)environment model in the target ***,through extensive RT simulations,the parameters extracted from RT simulations can be fed into either ray-based novel stochastic channel models or cluster-based standard channel model *** by RT simulations,these models can generate realistic channels that are valuable for the design and evaluation of THz *** two ends of 6G THz use cases from microscopy to macroscopy,case studies are made for close-proximity communications,wireless connections on a desktop,and smart rail mobility,*** but not least,new concerns on channel modeling resulting from distinguishing features of THz wave are discussed regarding propagation,antenna array,and device aspects,respectively.

关键词： channel modeling channel sounding raytracing THz communication 6G

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Artistic Augmentation of Photographs with Droplets

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Journal of Computer Science & Technology 2019年第6期34卷 1294-1306页

作者： Mo-Han Zhang Jin-Hui Yu Kang Zhang Jun-Song Zhang State Key laboratory of CAD&CG Zhejiang UniversityHangzhou 310027China Department of Computer Science Harbin Finance UniversityHarbin 150030China Department of Computer Science The University of Texas at DallasRichardsonTX 75080-3021U.S.A. Faculty of Information Technology Macao University of Science and TechnologyMacao 999078China National Engineering research Center for E-Learning Central China Normal UniversityWuhan 430079China

Artistic augmentation of photographs with water droplets aims at generating aesthetic yet realistic images, and thus differs from traditional augmented reality in two aspects. One difference lies in the adoption of a new image as the environment map in order to render reflected or refracted effects on the surface of inserted water droplets. The other difference is in modeling of water droplets including hanging droplets and resting droplets. These differences raise two research challenges:(1) how to adjust the brightness and colors of the new environment map to maintain visual consistency between the new environment map and the original input image;(2) how to model hanging and resting droplets aesthetically. This paper proposes a framework that addresses these two challenges and demonstrates the effectiveness of our framework by generating example augmented images.

关键词： artistic augmentation augmented reality illumination estimation droplet modeling image-based modeling

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Enhancement of the polynomial functions response surface model for real-time analyzing ozone sensitivity

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Frontiers of environmental Science & Engineering 2021年第2期15卷 155-168页

作者： Jiangbo Jin Yun Zhu Jicheng Jang Shuxiao Wang Jia Xing Pen-Chi Chiang Shaojia Fan Shicheng Long Guangdong Provincial Key laboratory of Atmospheric environment and Pollution Control College of Environment and EnergySouth China University of TechnologyGuangzhou Higher Education Mega CenterGuangzhou 510006China Southern Marine Science and Engineering Guangdong laboratory Sun Yat-Sen UniversityZhuhai 519000China State Key Joint laboratory of environment Simulation and Pollution Control School of EnvironmentTsinghua UniversityBeijing 100084China Graduate Institute of environmental Engineering Taiwan UniversityTaipei 10673China Carbon Cycle research Center Taiwan UniversityTaipei 10672China

Quantification of the nonlinearities between ambient ozone(O3)and the emissions of nitrogen oxides(NOx)and volatile organic compound(VOC)is a prerequisite for an effective O3 control *** Enhanced polynomial functions Response Surface Model(Epf-RSM)with the capability to analyze O3-NOx-VOC sensitivities in real time was developed by integrating the hill-climbing adaptive method into the optimized Extended Response Surface Model(ERSM)*** Epf-RSM could single out the best suited polynomial function for each grid cell to quantify the responses of O3 concentrations to precursor emission *** comparisons between Epf-RSM and pf-ERSM(polynomial functions based ERSM)were performed using out-of-sample validation,together with comparisons of the spatial distribution and the Empirical Kinetic modeling Approach *** comparison results showed that Epf-RSM effectively addressed the drawbacks of pf-ERSM with respect to overfitting in the margin areas and high biases in the transition *** O3 concentrations predicted by Epf-RSM agreed well with Community Multi-scale Air Quality simulation *** case study results in the Pearl River Delta and the north-western area of the Shandong province indicated that the O3 formations in the central areas of both the regions were more sensitive to anthropogenic VOC in January,April,and October,while more NOx-sensitive in July.

关键词： Response surface model Hill-climbing algorithm Ozone pollution Precursor emissions Control strategy

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Understanding sustainability of soil and water resources in a critical zone perspective

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Science China Earth Sciences 2019年第11期62卷 1716-1718页

作者： Ganlin ZHANG Yongguan ZHU Ming'an SHAO State Key laboratory of Soil and Sustainable Agriculture Institute of Soil ScienceChinese Academy of SciencesNanjing 210008China Key laboratory of Urban environment and Health Institute of Urban EnvironmentChinese Academy of SciencesXiamen 361021China Key laboratory of Ecosystem Network Observation and modeling Institute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesBeijing 100101China University of Chinese Academy of Sciences Beijing 100049China

Soil and water resources are fundamental for human *** the status and the evolution of regional water and soil resources is the prerequisite for their sustainable *** is severely constrained by water and soil resources which are subject to soil forming processes under different natural factors such as climate and relief,and also influenced by diversified landuse histories and *** and security of water and soil resources are therefore influenced by both natural and anthropogenic processes.

关键词： soil management resources

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Reconstructions of time-evolving sound-speed fields perturbed by deformed and dispersive internal solitary waves in shallow water

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Chinese Physics B 2023年第12期32卷 404-415页

作者：李沁然孙超谢磊黄晓冬 School of Marine Science and Technology Northwestern Polytechnical UniversityXi'an 710072China Shaanxi Key laboratory of Underwater Information Technology Xi'an 710072China Qingdao research Institute Northwestern Polytechnical UniversityQingdao 266200China Frontier Science Center for Deep Ocean Multispheres and Earth System and Physical Oceanography laboratory Ocean University of ChinaQingdao 266100China Key laboratory of Ocean Observation and Information of Hainan Province and Sanya Oceanographic Institution Ocean University of ChinaSanya 572024China Laoshan laboratory Qingdao 266237China

The high-fidelity reconstruction of sound speeds is crucial for predicting acoustic propagation in shallow water where internal solitary waves(ISWs)are *** temperatures from time series to spatial fields is an approach widely used to reproduce the sound speed perturbed by deformed internal ***,wave-shape distortions are inherent in the modeling *** paper analyzes the formation mechanism and dynamic behavior of the distorted waveform that is shown to arise from the mismatch between the modeled and real propagation speeds of individual solitons within an ISW *** mitigate distortions,a reconstruction method incorporating the dispersion property of an ISW train is proposed *** principle is to assign each soliton a real speed observed in the ***,the modeled solitons propagate at their intrinsic speeds,and the packet disperses naturally with *** method is applied to reconstruct the sound speed perturbed by ISWs in the South China *** mean and median of the root-mean-square error between the reconstructed and measured sound speeds are below 2 m/*** modeled shape deformations and packet dispersion agree well with observations,and the waveform distortion is reduced compared with the original *** work ensures the high fidelity of waveguide-environment reconstructions and facilitates the investigation of sound propagation in the future.

关键词： internal solitary wave deformation dispersion sound speed

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Development and case study of a science-based software platform to support policy making on air quality

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Journal of environmental Sciences 2015年第1期27卷 97-107页

作者： Yun Zhu Yanwen Lao Carey Jang Chen-Jen Lin Jia Xing Shuxiao Wang Joshua S.Fu Shuang Deng Junping Xie Shicheng Long Guangdong Provincial Key laboratory of Atmospheric environment and Pollution Control College of Environmental and Energy South China University of Technology Guangzhou Higher Education Mega Center State environmental Protection Key laboratory of Sources and Control of Air Pollution Complex School of Environment Tsinghua University College of environmental and Energy South China University of Technology Guangzhou Higher Education Mega Center USEPA/Office of Air Quality Planning & Standards RTPNC 27711 USA Department of Civil Engineering Lamar University Department of Civil & environmental Engineering University of Tennessee Chinese research Academy of environmental Sciences

This article describes the development and implementations of a novel software platform that supports real-time, science-based policy making on air quality through a user-friendly interface. The software, RSM-VAT, uses a response surface modeling（RSM） methodology and serves as a visualization and analysis tool（VAT） for three-dimensional air quality data obtained by atmospheric models. The software features a number of powerful and intuitive data visualization functions for illustrating the complex nonlinear relationship between emission reductions and air quality benefits. The case study of contiguous *** that the enhanced RSM-VAT is capable of reproducing the air quality model results with Normalized Mean Bias 〈 2% and assisting in air quality policy making in near real time.

关键词： Air quality Policy making Response surface modeling Emission control scenarios Data visualization

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