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Development of a high-resolution near-surface meteorological forcing dataset for the Third Pole region

Science China Earth Sciences 2025年第4期68卷 1274-1290页

作者： Yaozhi JIANG Wenjun TANG Kun YANG Jie HE Changkun SHAO Xu ZHOU Hui LU Yingying CHEN Xin LI Jiancheng SHI School of Resources and Environment University of Electronic Science and Technology of ChinaChengdu611731China Department of Earth System Science Ministry of Education Key Laboratory for Earth System ModelingInstitute for Global Change StudiesTsinghua UniversityBeijing100084China National Tibetan Plateau Data Center State Key Laboratory of Tibetan Plateau Earth SystemEnvironment and ResourcesInstitute of Tibetan Plateau ResearchChinese Academy of SciencesBeijing100101China State Key Laboratory of Hydroscience and Engineering Tsinghua UniversityBeijing100084China Tsinghua University(Department of Earth System Science)-Xi’an Institute of Surveying and Mapping Joint Research Center for Next-Generation Smart Mapping Beijing100084China National Space Science Center Chinese Academy of SciencesBeijing100190China

Recently,the Third Pole(TP)region has experienced rapid environmental *** data are essential for hydrometeorological and ecological applications but still have large uncertainties on the TP owing to the heterogeneous land surface,complex terrain,and sparse weather *** this study,a long-term(1979–2020)high-resolution(1/30°)meteorological forcing dataset for the TP(TPMFD)was developed,as a sister to the widely used China Meteorological Forcing dataset(CMFD).The TPMFD comprises seven components necessary for driving land surface *** have previously contributed precipitation and downward shortwave radiation data for the TPMFD,and this study presents the development of five other components and focuses on validations for all ***,2-meter air temperature,2-meter specific humidity,10-meter wind speed,and surface air pressure were generated by combining the fifth-generation atmospheric reanalysis for European Center for Medium-Range Weather Forecasts(ERA5),a short-term high-resolution atmospheric simulation,and in situ observations,and the downward longwave radiation was calculated using semi-physical *** cross-validation and independent-validation demonstrated that most variables in the developed dataset outperformed those in widely used reanalysis datasets,including ERA5,ERA5-Land,and the Global Land data Assimilation system(GLDAS).This dataset is expected to be beneficial for climate analyses and modeling applications of land-surface processes on the TP.

关键词： Meteorological data Third Pole High-resolution data downscaling and merging

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PieBridge: Fast and Parameter-Efficient On-Device Training via Proxy Networks 24

PieBridge: Fast and Parameter-Efficient On-Device Training v...

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22nd ACM Conference on Embedded Networked Sensor systems, SenSys 2024

作者： Yin, Wangsong Xu, Daliang Huang, Gang Zhang, Ying Wei, Shiyun Xu, Mengwei Liu, Xuanzhe School of Computer Science Peking University Beijing China National Key Laboratory of Data Space Technology and System Beijing China Zhongguancun Laboratory Beijing China Beijing University of Posts and Telecommunications Beijing China

ISBN: (纸本)9798400706974

On-device training Neural Networks (NNs) has been a crucial catalyst towards privacy-preserving and personalized mobile intelligence. Recently, a novel training paradigm, namely Parameter-Efficient Training (PET), is attracting attention in both the machine learning and system community. In our preliminary measurements, we find PET well-suited for on-device scenarios;yet, its parameter efficiency does not translate coequal to time efficiency on resource-constrained devices, as the training time is dominated by the frozen *** this end, this work presents PieBridge, an on-device training framework with both time and parameter efficiency. Its key idea is to dynamically approximate the frozen layers to cheaper ones (subnets) with data awareness during PET To achieve effective and efficient approximate training, we introduce (1) a pre-training-assisted on-cloud subnets generation method and (2) an edge-friendly on-device data-aware subnets routing method. The subnets generation method performs fine-grained pruning and latent space alignment to generate a series of high-quality proxy subnets with varying speed-accuracy trade-offs for the deployment-ready NN. The subnets routing method perceives data diversity from two unique perspectives (referred to as importance and difficulty). The routing strategy is provided by an offline-learning and online-estimation fusion, which is accurate, end-to-end and cost-effective on devices. Through extensive experiments, we show that PieBridge exhibits up to 2.5X training speedup compared to state-of-the-art PET methods, and up to 6.6X speedup compared to traditional full model training and other on-device training frameworks, without compromising parameter efficiency and accuracy. © 2024 Copyright is held by the owner/author(s).

关键词： Neural networks

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Robust and Trustworthy data Sharing Framework Leveraging On-Chain and Off-Chain Collaboration

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Computers, Materials & Continua 2024年第2期78卷 2159-2179页

作者： Jinyang Yu Xiao Zhang Jinjiang Wang Yuchen Zhang Yulong Shi Linxuan Su Leijie Zeng School of Computer Science Northwestern Polytechnical UniversityXi’an710072China MIIT Key Laboratory of Big Data Storage and Management Northwestern Polytechnical UniversityXi’an710072China National Engineering Laboratory for Integrated Aero-Space-Ground-Ocean Big Data Application Technology Northwestern Polytechnical UniversityXi’an710072China

The proliferation of Internet of Things(IoT)systems has resulted in the generation of substantial data,presenting new challenges in reliable storage and trustworthy *** distributed storage systems are hindered by centralized management and lack traceability,while blockchain systems are limited by low capacity and high *** address these challenges,the present study investigates the reliable storage and trustworthy sharing of IoT data,and presents a novel system architecture that integrates on-chain and off-chain data manage *** architecture,integrating blockchain and distributed storage technologies,provides high-capacity,high-performance,traceable,and verifiable data storage and *** on-chain system,built on Hyperledger Fabric,manages metadata,verification data,and permission information of the raw *** off-chain system,implemented using IPFS Cluster,ensures the reliable storage and efficient access to massive files.A collaborative storage server is designed to integrate on-chain and off-chain operation interfaces,facilitating comprehensive data *** provide a unified access interface for user-friendly system *** testing validates the system’s reliability and stable *** proposed approach significantly enhances storage capacity compared to standalone blockchain *** reliability tests consistently yield positive *** average upload and download throughputs of roughly 20 and 30 MB/s,respectively,the system’s throughput surpasses the blockchain system by a factor of 4 to 18.

关键词： On-chain and off-chain collaboration blockchain distributed storage system hyperledger fabric IPFS cluster

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Collaborative Service Provisioning for UAV-Assisted Mobile Edge Computing

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Chinese Journal of Electronics 2024年第6期33卷 1504-1514页

作者： Yuben QU Zhenhua WEI Zhen QIN Tao WU Jinghao MA Haipeng DAI Chao DONG The Key Laboratory of Dynamic Cognitive System of Electromagnetic Spectrum Space Ministry of Industry and Information Technology Colllege of Electronic and Information Engineering Nanjing University of Aeronautics and Astronautics Xi'an Research Institute of High Technology Department of Information and Communication Noncommissioned Officer Academy of PAP National University of Defense Technology Department of Computer Science and Technology Nanjing University

Unmanned aerial vehicle(UAV)-assisted mobile edge computing(MEC), as a way of coping with delaysensitive and computing-intensive tasks, is considered to be a key technology to solving the challenges of terrestrial MEC networks. In this work, we study the problem of collaborative service provisioning(CSP) for UAV-assisted MEC. Specifically, taking into account the task latency and other resource constraints, this paper investigates how to minimize the total energy consumption of all terrestrial user equipments, by jointly optimizing computing resource allocation, task offloading, UAV trajectory, and service placement. The CSP problem is a non-convex mixed integer nonlinear programming problem, owing to the complex coupling of mixed integral variables and non-convexity of CSP. To address the CSP problem, this paper proposes an alternating optimization-based solution with the convergence guarantee as follows. We iteratively deal with the joint service placement and task offloading subproblem, and UAV movement trajectory subproblem, by branch and bound and successive convex approximation, respectively,while the closed form of the optimal computation resource allocation can be efficiently obtained. Extensive simulations validate the effectiveness of the proposed algorithm compared to three baselines.

关键词： Energy consumption Multi-access edge computing Collaboration Programming Autonomous aerial vehicles Minimization Trajectory Resource management Optimization Convergence

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Spatiotemporal deformation analysis of glaciers and surrounding landscapes in the Shishapangma region using InSAR techniques

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Journal of Mountain Science 2025年第1期22卷 210-229页

作者： LIANG Wenli LIU Rui JI Qin KOU Pinglang Chongqing Key Laboratory of GIS Application School of Geography and TourismChongqing Normal UniversityChongqing 401331China National Earth System Science Data Center Beijing 100000China Chongqing Engineering Research Center of Spatial Big Data Intelligent Technology Chongqing University of Posts and TelecommunicationsChongqing 400065China Key Laboratory of Tourism Multisource Data Perception and Decision Ministry of Culture and Tourism(TMDPDMCT)Chongqing University of Posts and TelecommunicationsChongqing 400065China

Glacier dynamics in the Himalayan midlatitudes,particularly in regions like the Shishapangma,are not yet fully understood,especially the localized topographic and climatic impacts on glacier *** study analyzes the spatiotemporal characteristics of glacier surface deformation in the Shishapangma region using the Small Baseline Subset(SBAS)Interferometric Synthetic Aperture Radar(In SAR)*** analysis reveals an average deformation rate of-4.02±17.65 mm/yr across the entire study area,with glacier regions exhibiting significantly higher rates of uplift(16.87±13.20 mm/yr)and subsidence(20.11±14.55 mm/yr)compared to non-glacier *** identifies significant surface lowering on the mountain flanks and localized uplift in certain catchments,emphasizing the higher deformation rates in glacial areas compared to non-glacial *** found a strong positive correlation between temperature and cumulative deformation(correlation coefficient of 0.63),particularly in glacier areas(0.82).The research highlights the role of temperature as the primary driver of glacier wastage,particularly at lower elevations,with strong correlations found between temperature and cumulative *** also indicates the complex interactions between topographic features,notably,slope gradient,which shows a positive correlation with subsidence rates,especially for slopes below 35°.South-,southwest-,and west-facing slopes exhibit significant uplift,while north-,northeast-,and east-facing slopes predominantly ***,we identified transition zones between debris-covered glaciers and clean ice as areas of most intense deformation,with average rates exceeding 30 mm/yr,highlighting these as potential high-risk zones for *** study comprehensively analyzes the deformation characteristics in both glacier and non-glacier areas in the Shishapangma region,revealing the complex interplay of topographic,climatic,and hydrological factors influencing glacier dynamic

关键词： Glacier melting SBAS-InSAR Topographic factors Temperature change Middle Himalayas

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Innovative design and optimization of a two-dimensional deployable nine-grid planar antenna mechanism with a flat reflection surface

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Chinese Journal of Aeronautics 2023年第11期36卷 529-550页

作者： Bo CHEN Ze JIANG Xinlu WEI Luyao GUO Xin ZHOU Yundou XU Junjie QIAN Yongsheng ZHAO Parallel Robot and Mechatronic System Laboratory of Hebei Province Yanshan UniversityQinhuangdao 066004China Key Laboratory of Advanced Forging&Stamping Technology and Science of Ministry of National Education Yanshan UniversityQinhuangdao 066004China Space Structure and Mechanism Technology Laboratory of China Aerospace Science and Technology Group Co.Ltd Shanghai 201109China Aerospace System Engineering Shanghai Shanghai 201109China

With the development of the aerospace industry,space missions are becoming more complicated and diversified,and there is a demand for antenna mechanisms with a larger physical *** this paper,a planar deployable mechanism is proposed,which can form a flat reflection surface with a small gap between *** this end,a novel large-scale two-dimensional deployable nine-grid planar antenna mechanism is ***,two antenna folding schemes and four supporting mechanism schemes are *** comparison analysis,the antenna configuration scheme with the best comprehensive performance is selected.A kinematic model of the deployable mechanism is established,and its kinematic characteristics are ***,the correctness of the kinematic model is verified by comparing the analytical and simulation results of the kinematic ***,a finite element model of the antenna is *** on the response surface method,the structural parameters of the support rods of the antenna are optimized,and a set of optimized solutions with lightweight and high fundamental frequency characteristics are ***,a prototype of the proposed nine-grid planar antenna is *** feasibility of the deployment principle and the rationality of the designed mechanism are verified by deployment experiments.

关键词： Design optimization Kinematics Planar antenna Structural design Two-dimensional expansion

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The FAST Galactic Plane Pulsar Snapshot Survey. Ⅶ. Six Millisecond Pulsars in Compact Orbits with Massive White Dwarf Companions

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Research in Astronomy and Astrophysics 2025年第1期25卷 66-76页

作者： Z.L.Yang J.L.Han T.Wang P.F.Wang W.Q.Su W.C.Chen C.Wang D.J.Zhou Y.Yan W.C.Jing N.N.Cai L.Xie J.Xu H.G.Wang R.X.Xu National Astronomical Observatories Chinese Academy of Sciences School of Astronomy and Space Science University of Chinese Academy of Sciences Key Laboratory of Radio Astronomy and Technology Chinese Academy of Sciences School of Science Qingdao University of Technology Department of Astronomy School of Physics and Materials ScienceGuangzhou University National Astronomical Data Center Department of Astronomy Peking University

Binary millisecond pulsars with a massive white dwarf （WD） companion are intermediate-mass binary pulsar（IMBPs）.They are formed via the Case BB Roche-lobe overflow evolution channel if they are in compact orbit with an orbital period of less than 1 *** are fairly rare in the known pulsar population;only five such IMBP have been discovered before,and one of them is in a globular *** we report six IMBPs in compact orbits PSRs J0416+5201,J0520+3722,J1919+1341,J1943+2210,J1947+2304 and J2023+2853,discovered during the Galactic Plane Pulsar Snapshot survey by using the Five-hundred-meter Aperture Spherical radio Telescope doubling the number of such IMBPs due to the high survey sensitivity in the short survey time of 5 minutes Follow-up timing observations show that they all have either a CO WD or an ONeMg WD companion with a mas greater than about 0.8 M⊙in a very circular orbit with an eccentricity in the order of?*** J0416+5201should be an ONeMg WD companion with a remarkable minimum mass of 1.28 M⊙.These massive WD companions lead to a detectable Shapiro delay for PSRs J0416+5201,J0520+3722,J1943+2210,and J2023+2853,indicating that their orbits are highly *** the measurement of the Shapiro delay,the pulsar mas of J1943+2210 was constrained to be 1.84-0.09+0.11M⊙,and that of PSR J2023+2853 to be 1.28-0.05+0.06M⊙.

关键词： (stars:) binaries (including multiple):close stars:evolution (stars:) pulsars:general

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Wiki2GH: A Recommendation Service to Link Software Engineering Knowledge to Practical Development 17th

Wiki2GH: A Recommendation Service to Link Software Engineeri...

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CCF 17th International Conference on Service Science, CCF ICSS 2024

作者： Zhou, Yuqi Sun, Yanchun Wu, Jiawei Zhang, Jiaqi Huang, Gang Key Laboratory of High Confidence Software Technologies Ministry of Education Beijing China School of Computer Science Peking University Beijing China School of Software and Microelectronics Peking University Beijing China National Key Laboratory of Data Space Technology and System Beijing China

ISBN: (纸本)9789819757596

High-quality software applications are built on the knowledge and best practices of software engineering. However, there is a huge gap between the theoretical knowledge of software engineering and its practical implementation for software developers, especially beginners of software development. This paper proposes an innovative recommendation service named Wiki2GH to link Wikipedia software engineering knowledge to GitHub frameworks and libraries, aiming to help software developers systematically learn knowledge and apply it into practice. To implement the Wiki2GH recommendation service, this paper first uses the public data of Wikipedia to build a hierarchy software development knowledge catalog as the entrance of the service. Next, we propose a deep learning method to identify frameworks and libraries and construct a knowledge graph of open source software repositories based on dependency graph. Then, we propose a combined application recommendation service of frameworks and libraries in the development practice. The methods proposed in this paper are all evaluated, including the repository type classification method, the recommendation method, and the knowledge graph construction method. Experimental results show the effectiveness of the recommendation service proposed in this paper. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2024.

关键词： Knowledge graph

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Toward Earth system modeling with resolved clouds and ocean submesoscales on heterogeneous many-core HPCs

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national Science Review 2023年第6期10卷 153-167页

作者： Shaoqing Zhang Shiming Xu Haohuan Fu Lixin Wu Zhao Liu Yang Gao Chun Zhao Wubing Wan Lingfeng Wan Haitian Lu Chenling Li Yanfei Liu Xiaojing Lv Jiayu Xie Yangyang Yu Jun Gu Xuantong Wang Yan Zhang Chenhui Ning Yunlong Fei Xiuwen Guo Zhaoying Wang Xue Wang Zhenming Wang Binglin Qu Mingkui Li Haoran Zhao Yingjing Jiang Guang Yang Lv Lu Hong Wang Hong An Xin Zhang Yu Zhang Wentao Ma Fujiang Yu Jing Xu Xiaopei Lin Xueshun Shen Key Laboratory of Physical Oceanography Ministry of Education/Institute for Advanced Ocean Study/Frontiers Science Center for Deep Ocean Multispheres and Earth System (DOMES) College of Oceanic and Atmospheric Sciences Ocean University of China Laoshan Laboratory Ministry of Education Key Lab for Earth System Modeling and Department of Earth System Science Tsinghua University National Supercomputing Center in Wuxi Frontiers Science Center for Deep Ocean Multispheres and Earth System and Key Laboratory of Marine Environment and Ecology Ministry of Education Ocean University of China Deep Space Exploration Laboratory/School of Earth and Space Sciences University of Science and Technology of China School of Computer Science and Technology University of Science and Technology of China CEAKJ ADPRHexa Inc. National Marine Environmental Forecasting Center State Key Laboratory of Satellite Ocean Environment Dynamics Second Institute of Oceanography Ministry of Natural Resources Chinese Academy of Meteorological Sciences The Center of Earth System Modeling and Prediction China Meteorological Administration

With the aid of the newly developed 'Sunway' heterogeneous-architecture supercomputer,which has world-leading HPC(high-performance computer) capability,a series of high-resolution coupled Earth system models(SW-HRESMs) with up to 5 km of atmosphere and 3 km of ocean have been *** models can meet the needs of multiscale interaction studies with different computational *** we describe the progress of SW-HRESMs development,with an overview of the major advancements made by the international Earth science community in *** also show the preliminary results of SW-HRESMs with regard to capturing major weather-climate extremes in the atmosphere and ocean,stressing the importance of permitted clouds and ocean submesoscale eddies in modeling tropical cyclones and eddy-mean flow interactions,and paving the way for further model development to resolve finer scales with even higher resolution and more realistic ***,in addition to increasing model resolution,the development procedure for a non-hydrostatic cloud and ocean submesoscale resolved ESM is discusse d,laying out the major scientific directions of such a huge modeling advancement.

关键词： high-resolution Earth system models heterogeneous supercomputer cloud and submesoscale resolving weather-climate extremes finer cross-scale interactions

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A review of the BuFeng-1 GNSS-R mission:calibration and validation results of sea surface and land surface

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地球空间信息科学学报（英文版） 2024年第3期27卷 638-652页

作者： Cheng Jing Weiqiang Li Wei Wan Feng Lu Xinliang Niu Xiuwan Chen Antonio Rius Estel Cardellach Semi Ribó Baojian Liu Zhizhou Guo Yang Nan National Key Laboratory of Science and Technology on Space Microwave China Academy of Space Technology(Xi'an)Xi'anChina Xi'an Institute of Space Radio Technology China Academy of Space Technology(Xi'an)Xi'anChina Institute of Space Sciences Spanish National Research Council(ICECSIC)Cerdanyola del VallèsSpain Department of Earth Observation Institut d'Estudis Espacials de CatalunyaBarcelonaSpain The Institute of Remote Sensing and Geographic Information System(IRSGIS) Peking UniversityBeijingChina The National Satellite Meteorological Center(NSMC) China Meteorological Administration(CMA)BeijingChina School of Soil and Water Conservation Beijing Forestry UniversityBeijingChina School of Marine Science and Technology Tianjin UniversityTianjinChina

In this paper,we will conclude the results of Bufeng-1(BF-1)A/B data processing,calibration workflow,and validation of the calibrated sea surface winds,land surface soil moisture,and sea surface height *** 2019,the BF-1 mission has operated in-orbit for over 4 *** Earth reflected delay Doppler maps(DDMs)are continuously collected to perform global sea surface and land *** the same time,the intermediate frequency(IF)raw data are also obtained for 12 seconds every pass in diagnostic *** begin with,a brief description of the spaceborne Global Navigation Satellite system Reflectometry(GNSS-R)technique will be provided in the ***,we will present the overview of Chinese BF-1 mission and the data specifications used in our *** the next section,the BF-1 mission-related spaceborne power calibration and validation are presented to show the sup-port to power DDM observable production for sea surface and land surface ***,the status of Chinese Beidou system(BDS)Equivalent Isotropic Radiated Power(EIRP)acquisi-tion programme is then ***,the latest sea surface height(SSH)measure-ments results including two modes(group delay and carrier phase)and wind speed derivation based on machine learning(ML)method will be spatial-temporal aligned and validated with auxiliary datasets including Denmark technology University(DTU)mean sea surface(MSS)products and European Centre for Medium-Range Weather Forecasts(ECMWF)ERA5 *** previous published results of sea surface winds retrieval under Hurricane conditions and soil moisture retrieval are also reviewed for the BF-1 mission ***,the conclu-sion of BF-1 derived results will be discussed to draw out ongoing/future works.

关键词： Global Navigation Satellite system-Reflectometry(GNSS-R) Delay-Doppler Map(DDM) sea surface height(SSH) soil moisture sea surface wind speed Bufeng-1 Immediate Frequency(IF)

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