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Scientific data products and the data pre-processing subsystem of the Chang'e-3 mission 认领 引用 被引量：9
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作者 Xu Tan Jian-Jun Liu +7 位作者 Chun-Lai Li Jian-Qing Feng Xin Ren Fen-Fei Wang Wei Yan Wei Zuo Xiao-Qian Wang Zhou-Bin Zhang 《Research in Astronomy and Astrophysics》 SCIE CAS CSCD 2014年第12期1682-1694,共13页
The Chang＇e-3 （CE-3） mission is China＇s first exploration mission on the surface of the Moon that uses a lander and a rover. Eight instruments that form the scientific payloads have the following objectives： （1... The Chang＇e-3 （CE-3） mission is China＇s first exploration mission on the surface of the Moon that uses a lander and a rover. Eight instruments that form the scientific payloads have the following objectives： （1） investigate the morphological features and geological structures at the landing site; （2） integrated in-situ analysis of minerals and chemical compositions; （3） integrated exploration of the structure of the lunar interior; （4） exploration of the lunar-terrestrial space environment, lunar sur- face environment and acquire Moon-based ultraviolet astronomical observations. The Ground Research and Application System （GRAS） is in charge of data acquisition and pre-processing, management of the payload in orbit, and managing the data products and their applications. The Data Pre-processing Subsystem （DPS） is a part of GRAS. The task of DPS is the pre-processing of raw data from the eight instruments that are part of CE-3, including channel processing, unpacking, package sorting, calibration and correction, identification of geographical location, calculation of probe azimuth angle, probe zenith angle, solar azimuth angle, and solar zenith angle and so on, and conducting quality checks. These processes produce Level 0, Level 1 and Level 2 data. The computing platform of this subsystem is comprised of a high-performance computing cluster, including a real-time subsystem used for processing Level 0 data and a post-time subsystem for generating Level 1 and Level 2 data. This paper de- scribes the CE-3 data pre-processing method, the data pre-processing subsystem, data classification, data validity and data products that are used for scientific studies. 展开更多
关键词 Moon： data products -- methods： data pre-processing -- space vehicles：instruments
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Intelligent Data Pre-processing Model in Integrated Ocean Observing Network System 认领 引用
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作者 韩华 丁永生 刘凤鸣 《Journal of Donghua University(English Edition)》 EI CAS 2009年第5期499-502,共4页
There are a number of dirty data in observation data set derived from integrated ocean observing network system. Thus, the data must be carefully and reasonably processed before they are used for forecasting or analys... There are a number of dirty data in observation data set derived from integrated ocean observing network system. Thus, the data must be carefully and reasonably processed before they are used for forecasting or analysis. This paper proposes a data pre-processing model based on intelligent algorithms. Firstly, we introduce the integrated network platform of ocean observation. Next, the preprocessing model of data is presemed, and an imelligent cleaning model of data is proposed. Based on fuzzy clustering, the Kohonen clustering network is improved to fulfill the parallel calculation of fuzzy c-means clustering. The proposed dynamic algorithm can automatically f＇md the new clustering center with the updated sample data. The rapid and dynamic performance of the model makes it suitable for real time calculation, and the efficiency and accuracy of the model is proved by test results through observation data analysis. 展开更多
关键词 integrated ocean observing network intelligentdata pre-processing data cleaning fuzzy soft clustering
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Observation data pre-processing and scientific data products generation of POLAR 认领 引用
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作者 Zheng-Heng Li Jian-Chao Sun +8 位作者 Li-Ming Song Bo-Bing Wu Lu Li Xing Wen Hua-Lin Xiao Shao-Lin Xiong Lai-Yu Zhang Shuang-Nan Zhang Yong-Jie Zhang 《Research in Astronomy and Astrophysics》 SCIE CAS CSCD 2019年第7期13-24,共12页
POLAR is a compact space-borne detector initially designed to measure the polarization of hard X-rays emitted from Gamma-Ray Bursts in the energy range 50–500 ke V.This instrument was launched successfully onboard th... POLAR is a compact space-borne detector initially designed to measure the polarization of hard X-rays emitted from Gamma-Ray Bursts in the energy range 50–500 ke V.This instrument was launched successfully onboard the Chinese space laboratory Tiangong-2(TG-2) on 2016 September 15.After being switched on a few days later,tens of gigabytes of raw detection data were produced in-orbit by POLAR and transferred to the ground every day.Before the launch date,a full pipeline and related software were designed and developed for the purpose of quickly pre-processing all the raw data from POLAR,which include both science data and engineering data,then to generate the high level scientific data products that are suitable for later science analysis.This pipeline has been successfully applied for use by the POLAR Science Data Center in the Institute of High Energy Physics(IHEP) after POLAR was launched and switched on.A detailed introduction to the pipeline and some of the core relevant algorithms are presented in this paper. 展开更多
关键词 gamma-ray burst general-methods data analysis-instrumentation polarimeters
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tsRNADisease:a manually curated database of tsRNAs associated with human disease 认领 引用 被引量：1
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作者 Hui Yang Shaoying Zhu +5 位作者 Huijun Wei Wei Huang Qi Chen Yungang He Kun Lv Zhen Yang 《Journal of Genetics and Genomics》 SCIE CAS CSCD 2026年第3期537-543,共7页
tRNA-derived small RNAs(tsRNAs),as a class of regulatory small noncoding RNA,have been implicated in a wide variety of human diseases.Large amounts of tsRNA–disease associations have been identified in recent years f... tRNA-derived small RNAs(tsRNAs),as a class of regulatory small noncoding RNA,have been implicated in a wide variety of human diseases.Large amounts of tsRNA–disease associations have been identified in recent years from accumulating studies.However,repositories for cataloging the detailed information on tsRNA–disease associations are scarce.In this study,we provide a tsRNADisease database by integrating experimentally and computationally supported tsRNA–disease associations from manual curation of literatures and other related resources.tsRNADisease contains 5571 manually curated associations between 4759 tsRNAs and 166 diseases with experimental evidence from 346 studies.In addition,it also contains 5013 predicted associations between 1297 tsRNAs and 111 diseases.tsRNADisease provides a user-friendly interface to browse,retrieve,and download data conveniently.This database can improve our understanding of tsRNA deregulation in diseases and serve as a valuable resource for investigating the mechanism of disease-related tsRNAs.tsRNADisease is freely available at http://gffzz9c504e06f78b4edahbuw5coponu506pwn.ffgz.tsg.suse.edu.cn. 展开更多
关键词 tsRNA Disease Cancer Data integration Database
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Research on data assimilation for turbulence model constants via airfoil wind tunnel experiments 认领 引用 被引量：1
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作者 Junwei Yang Lingting Meng +1 位作者 Xiangjun Wang Hua Yang 《Theoretical & Applied Mechanics Letters》 EI CAS CSCD 2026年第2期42-56,共15页
Data assimilation algorithms have been demonstrated to increase the accuracy of predictions in airfoil flow fields.However,slight changes in airfoil geometry and Reynolds number(Re)variations could lead to differences... Data assimilation algorithms have been demonstrated to increase the accuracy of predictions in airfoil flow fields.However,slight changes in airfoil geometry and Reynolds number(Re)variations could lead to differences in aerodynamic characteristics and stall behavior,consequently affecting assimilation outcomes.Hence,this research uses the ensemble Kalman filter(EnKF)algorithm.The aerodynamic characteristics of two wind turbine airfoils obtained through wind tunnel experiments were investigated under varying degrees of stall by recalibrating the constants in the(S-A)model.The impacts of the airfoil thickness,Re variation,and Gurney flap installation on the assimilation results were subsequently examined.Verifying the applicability of the constants obtained via data assimilation under varying conditions might offer opportunities to reduce the demand for computational resources.The assimilation results indicate that at a Re on the order of magnitude of 105,the original model tends to delay flow separation as the Re increases.Consequently,the recalibrated constant Cb1 generally decreases with increasing Re.Despite belonging to the same airfoil family,discrepancies in the flow separation behavior predicted by the original model resulted in variations in the recalibrated constants.The constants derived from the thinner airfoil induce premature flow separation in the thicker YA-30 airfoil under stall conditions.When assimilated constants are applied to flow field calculations under analogous stall conditions,constants from another condition may demonstrate an optimization effect and substitute the self-assimilated constants,provided that simulations using default constants for both conditions consistently exhibit an experimental separation trend.However,practical implementation requires caution due to the risk of overadjustment. 展开更多
关键词 Wind turbine airfoil Pressure distribution Data assimilation Spalart-Allmaras model Applicability
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The influence of quasi-2-day waves on the transport of CO2 based on WACCM-NEDAS data assimilation 认领 引用 被引量：1
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作者 Sheng-Yang Gu XiaoLong Wang +2 位作者 Hao Chen YuXuan Liu YuSong Qin 《Earth and Planetary Physics》 EI CSCD 2026年第3期463-471,共9页
The distribution and transport of carbon dioxide(CO2)in the middle and upper atmosphere are closely linked to atmospheric dynamical processes,but the influence of planetary waves on CO2 transport remains unclear... The distribution and transport of carbon dioxide(CO2)in the middle and upper atmosphere are closely linked to atmospheric dynamical processes,but the influence of planetary waves on CO2 transport remains unclear.This study aims to investigate the impact of quasi-2-day waves(Q2DWs)on CO2 transport in the stratosphere-mesosphere during the sudden stratospheric warming(SSW)period.On the basis of data assimilation(DA)using the Whole Atmosphere Community Climate Model(WACCM)+Next-generation Ensemble Data Assimilation System(NEDAS)from December 2018 to February 2019,we used the transformed Eulerian mean framework to conduct a diagnostic analysis on Q2DW propagation and amplification.Additionally,we identified unstable regions in the stratosphere between 60°N and 80°N.This configuration facilitates the amplification of Q2DWs through enhanced baroclinic and barotropic instabilities.The results demonstrate that the dynamic features exhibit distinct propagation and amplification characteristics.We also found distinct Q2DWs in CO2 at the middle latitudes of the southern hemisphere,which were mainly induced by the Q2DWs in temperature.Further analysis showed that the anomalous vertical motion during the SSW period could lead to the enhancement of CO2 vertical gradients,which also contributed to the strengthening of Q2DWs in CO2. 展开更多
关键词 quasi-2-day wave sudden stratospheric warming data assimilation CO2transport
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Data grading for intelligent connected vehicles:An inference strength-driven framework 认领 引用
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作者 Shichun Yang Bowen Zheng +9 位作者 Yi Shi Haoran Guang Tianyang Gong Weifeng Gong Xinjie Feng Mingjie Chen Yaoguang Cao Hao Wu Tian Liu Jia Zhao 《Digital Communications and Networks》 SCIE EI CSCD 2026年第4期698-715,共18页
Intelligent Connected Vehicles(ICVs)generate massive heterogeneous multi-modal data during operation,and due to the limited computing resources on board,graded data encryption protection is of great significance for b... Intelligent Connected Vehicles(ICVs)generate massive heterogeneous multi-modal data during operation,and due to the limited computing resources on board,graded data encryption protection is of great significance for balancing data security and efficient utilization.However,the current data grading processes struggle to address the evolving inference attacks and dynamic operational environments,and traditional grading approaches relying on static expert judgment or information-theoretic metrics.To bridge this gap,this paper proposes a novel inference strength-driven data grading framework,where inference strength quantifies the susceptibility of one dataset to infer another through adversarial reasoning.The framework employs a systematic methodology combining graph theory,optimization,and Large Language Models to construct an inference library and calculate inference strength.The framework also provides a PageRank-based algorithm to generate interpretable data grading lists for both static policy and vehicle-end application,prioritizing core data protection while respecting computational constraints.Validated on the Audi A2D2 dataset and real vehicle controller,our approach demonstrates improved protection utility compared to default grading baselines.The results highlight its potential to enhance data security in ICVs through prioritized protection of core data under computational constraints. 展开更多
关键词 Intelligent vehicles Data security Risk analysis Data handling
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Full-waveform inversion constrained by adaptive sonic logging data within a Bayesian framework 认领 引用
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作者 Jing Wang Qing-Qing Li +2 位作者 Li-Jun Gao Zong-Jie Li Li-Yun Fu 《Petroleum Science》 SCIE EI CAS CSCD 2026年第1期205-219,共15页
The full waveform inversion(FWI)utilizes full wave field data to invert subsurface parameters and is considered one of the most promising data-driven tools for obtaining high precision velocity models.However,the succ... The full waveform inversion(FWI)utilizes full wave field data to invert subsurface parameters and is considered one of the most promising data-driven tools for obtaining high precision velocity models.However,the successful application of FWI in geophysical explo ration remains limited,primarily due to the cycle-skipping issue caused by the absence of low-frequency data,which is one of the main reasons for FWI failures.Incorporating prior regularization constraints FWI can effectively compensate for the lacking low-frequency components and constrain the iterative updates of FWI toward the desired direction,offering a natural advantage in addressing this challenge.However,the weights of the prior information terms are still determined empirically,which introduces significant subjectivity and randomness to the inversion results.To solve this issue,we propose an adaptive method to determine the weight factor based on posterior probability distribution within the Bayesian theoretical framework.This factor adaptively adjusts during each iteration to balance the contributions of the data error term and the prior information term in FWI,which can effectively mitigate the cycle-skipping problem and alleviating the nonlinearity of the inversion process.Numerical examples from the Overthrust model and the Marmousi model show that our method not only enhance the accuracy of FWI,but also demonstrate strong noise resistance. 展开更多
关键词 Full waveform inversion Low-frequency data Sonic logging data Adaptive prior regularization
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Data clustering:a fundamental method in data science and management 认领 引用
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作者 Tai Dinh Hauchi Wong +4 位作者 Daniil Lisik Michal Koren Dat Tran Philip S.Yu Joaquín Torres-Sospedra 《Data Science and Management》 EI CSCD 2026年第1期136-161,共26页
This study investigates the pivotal role of data clustering in both data science and management,focusing on core methodologies,tools,and diverse applications.It examines traditional clustering techniques such as parti... This study investigates the pivotal role of data clustering in both data science and management,focusing on core methodologies,tools,and diverse applications.It examines traditional clustering techniques such as partitional and hierarchical methods,alongside more advanced approaches,including data stream,density-based,graphbased,and model-based clustering,which are essential for processing complex and structured datasets.The study highlights fundamental principles,presents commonly adapted tools and frameworks,outlines the clustering workflow within data science,and discusses major implementation challenges.Beyond technical applications,this study emphasizes how clustering supports managerial tasks and decision-making through a comprehensive survey of recent literature.By bridging analytical techniques with real-world business needs,clustering remains an essential tool in both data science and management.The study concludes by outlining future research directions,underscoring the role of clustering in driving innovation and enabling informed strategic and operational decisions. 展开更多
关键词 Data mining Cluster analysis Data science Management Artificial intelligence Machine learning
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A new integrated 3D modeling method based on multisource heterogeneous geological data and its application 认领 引用
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作者 Zhao-yang Ma Sen Zhang +3 位作者 Jie Li Ya-kai Qiao Hua-feng Sun Fateh Bouchaala 《China Geology》 CAS CSCD 2026年第2期383-399,共17页
With continuous advancement in geological studies,three-dimensional(3D)geological modeling technology based on big data and artificial intelligence(AI)has become a prominent focus in the interdisciplinary field of ear... With continuous advancement in geological studies,three-dimensional(3D)geological modeling technology based on big data and artificial intelligence(AI)has become a prominent focus in the interdisciplinary field of earth and information sciences.Through the analysis and comparison of existing 3D modeling methods,this study introduces a high-precision 3D geological modeling approach.The new method leverages advanced computing technologies,including multisource heterogeneous data processing,integrated model databases,seamless splicing of local models,and cluster analysis.Furthermore,it enables unified 3D visualization of subsurface and surface conditions,providing new insights into disaster prevention,mitigation,and intelligent mineral exploration.To validate its practicality,this study conducts 3D geological modeling of the X area within the Sichuan Basin,China.The data sources include remote sensing images,geological maps,geophysical data,borehole data,and X-ray fluorescence(XRF)spectroscopy data.Preliminary exploration in the X area has successfully identified new mineralization belts,verifying the feasibility and effectiveness of the new 3D geological modeling method that integrates big data processing and intelligent techniques. 展开更多
关键词 Big data Artificial intelligence Geological modeling Multisource heterogeneous data Intelligent mineral exploration Remote sensing images Geological maps Geophysical data 3D visualization
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Fault data augmentation for electromechanical coupling systems based on hierarchical collaborative digital twin 认领 引用
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作者 Xuanyuan SU Laifa TAO +5 位作者 Bo SUN Kaixin JIN Yongzhe MA Xinwei WANG Chen LU Yu DING 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2026年第4期349-378,共30页
Effective fault diagnosis is crucial for the reliable running of Electromechanical coupling Systems(EMS),yet hampered by insufficient entity fault data.Digital Twin(DT)technology offers the potential for virtual fault... Effective fault diagnosis is crucial for the reliable running of Electromechanical coupling Systems(EMS),yet hampered by insufficient entity fault data.Digital Twin(DT)technology offers the potential for virtual fault data augmentation and fault diagnosis improvement.However,there is still a lack of an effective and systematic methodology,to decouple complicated EMS entities and construct their full-system DT.To address this,a hierarchical collaborative DT construction framework is proposed for fault data augmentation of EMS.Specially,we decouple EMS entity into the triplet representations of element,data,and relationship,which establish the profound understanding of coupling characteristics from multiple modalities.Furthermore,we develop a hierarchical DT modeling method to mirror these complicated couplings as four-level sub-DTs of space,behavior,process,and status.Each level of sub-DT utilizes the data-mechanism combined technique to balance modeling adaptability and precision.Finally,these heterogeneous sub-DTs are integrated as full-system DT driven by collaborative orchestration algorithm,which achieves the global consistency mirror with the real fault manifestation under diverse fault modes.Experiments on a multi-coupled electromechanical fault test bench validate our framework.Results exhibit the average improvements of 17.29%and 9.97%in accuracy of data augmentation fault classification,confirming its superiority and effectiveness. 展开更多
关键词 Data and knowledge fusion Data generation Digital twin Electromechanical coupling systems Fault diagnosis
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OT-ADG:Optimal-transport-driven adaptive data generation for WiFi sensing in airborne mobile networks 认领 引用
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作者 Xinxin LU Zhiyi ZHOU +4 位作者 Jiancheng CHI Lei WANG Yunbo CHEN Xin HAN Ning CHEN 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2026年第5期67-83,共17页
Airborne Mobile Networks(AMNs)require high-precision situational awareness in enclosed spaces for critical tasks like border surveillance and maritime monitoring.Compared to vision and wearable technologies,WiFi signa... Airborne Mobile Networks(AMNs)require high-precision situational awareness in enclosed spaces for critical tasks like border surveillance and maritime monitoring.Compared to vision and wearable technologies,WiFi signals in AMN environments are a promising sensing medium due to their non-intrusiveness,cost-effectiveness,and privacy benefits.However,the development of WiFi-based sensing in AMNs is hindered by the scarcity of high-quality large-scale data.While Data Augmentation(DA)can address this scarcity,traditional time-series DA may distort WiFi Channel State Information(CSI)'s time–frequency properties,and deep generative models suffer from mode collapse,spectral distortion,and high computational costs.To overcome these limitations,we propose OT-ADG,an adaptive data generation algorithm based on Optimal Transport(OT)theory to synthesize high-fidelity WiFi sensing samples.It dynamically models subcarrierspecific energy distributions and computes optimal transport plans using Sinkhorn's algorithm with entropy regularization.Furthermore,we present ViFi,the first large-scale and scenario-rich WiFi sensing dataset to fill the gap in AMN applications,encompassing 26 real-world scenarios with 20640 CSI samples and synchronized videos.Experimental results show OT-ADG's superior performance,with maximum improvements of up to 14.88%over baseline recognition methods,while outperforming existing DA approaches.Moreover,the robust performance of multiple WiFi-based HAR models validates the effectiveness of the ViFi dataset. 展开更多
关键词 Airborne mobile networks WiFi sensing Data augmentation Optimal transport Multi-modal dataset Data processing
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Methods for correcting mud-logging lithology profi le using well logging data based on neural networks 认领 引用
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作者 Jin Li-zuan Sun Yu-hong +2 位作者 Li Hui Dai Zi-shan Wang Cheng-fang 《Applied Geophysics》 SCIE CSCD 2026年第2期710-719,870,共10页
This study presents a method to correct the lithology of mud-logging profile with logging data based on neural network,which aims to solve the problems of time-consuming,high labor intensity and great infl uence of hu... This study presents a method to correct the lithology of mud-logging profile with logging data based on neural network,which aims to solve the problems of time-consuming,high labor intensity and great infl uence of human factors in the process of traditional lithology correction of mud-logging profi le.Firstly,the lithology of mud-logging profi le is processed by digital technology and converted into digital curve which is consistent with the logging sampling interval,and the logging lithology curve is calculated by using the optimal logging method.Then,combining automatic depth-correction technology with manual correction methods,the lithology of mud-logging profi le is corrected for depth.On the basis of lithology depth-correction of mudlogging profile,the multi-layer perceptron(MLP)neural network is used to learn logging data and realize accurate identification of multiple lithologies,so as to construct a high-precision logging profile lithology curve and provide accurate basis for lithology correction of mud-logging profile.The effectiveness and accuracy of the proposed method are verifi ed by practical application cases.The corrected lithology of mudlogging profi le is highly consistent with the lithology of logging profi le,which provides a solid foundation for subsequent geological interpretation,reservoir evaluation and oil and gas resource assessment.This study not only improves the effi ciency of mud-logging data processing,but also ensures that the needs of exploration and exploitation work are met in a timely manner,which has important theoretical signifi cance and application value. 展开更多
关键词 logging data neural network data fusion mud-logging profi le lithology correction
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Real-world data and evidence:pioneering frontiers in precision oncology 认领 引用
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作者 Jingxin JIANG Weiwei PAN +4 位作者 Liyang SUN Liwei PANG Hailang CHEN Jian HUANG Wuzhen CHEN 《Journal of Zhejiang University-SCIENCE B》 SCIE CAS CSCD 2026年第1期44-57,共14页
Real-world studies(RWSs)have emerged as a transformative force in oncology research,complementing traditional randomized controlled trials(RCTs)by providing comprehensive insights into cancer care within routine clini... Real-world studies(RWSs)have emerged as a transformative force in oncology research,complementing traditional randomized controlled trials(RCTs)by providing comprehensive insights into cancer care within routine clinical settings.This review examines the evolving landscape of RWSs in oncology,focusing on their implementation,methodological considerations,and impact on precision medicine.We systematically analyze how RWSs leverage diverse data sources,including electronic health records(EHRs),insurance claims,and patient registries,to generate evidence that bridges the gap between controlled clinical trials and real-world clinical practice.The review underscores the key contributions of RWSs,including capturing therapeutic outcomes in traditionally underrepresented populations,expanding drug indications,and evaluating long-term safety and effectiveness in routine clinical settings.While acknowledging significant challenges,including data quality variability and privacy concerns,we discuss how emerging technologies like artificial intelligence are helping to address these limitations.The integration of RWSs with traditional clinical research is revolutionizing the paradigm of precision oncology and enabling more personalized treatment approaches based on real-world evidence. 展开更多
关键词 Real-world study(RWS) Precision oncology Real-world data(RWD) Study design Data characterization
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Evaluation of CFSv2,MERRA2,and ERA5 Sea Surface Wind Field Reanalysis Data in the Bohai and Yellow Seas 认领 引用
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作者 LIU Aichao LU Bo +3 位作者 SUN Jingyi JI Chengzhen SHANG Jie QIAN Chengcheng 《Journal of Ocean University of China》 SCIE CAS CSCD 2026年第2期480-488,共9页
In this study,buoy measurements of sea surface wind fields(10 m above the sea surface)were collected at 12 stations in the Bohai and Yellow Seas over a period of 11 years(2011-2021).An evaluation was conducted of the ... In this study,buoy measurements of sea surface wind fields(10 m above the sea surface)were collected at 12 stations in the Bohai and Yellow Seas over a period of 11 years(2011-2021).An evaluation was conducted of the 10 m wind performance of the Climate Forecast System Reanalysis version 2(CFSv2),Modern-Era Retrospective Analysis for Research and Applications version 2(MERRA2),and the fifth-generation European Centre for Medium-Range Weather Forecasts reanalysis products(ERA5)in reproducing wind fields over the Bohai and Yellow Seas.The mean BIAS,root mean square error(RMSE),and correlation coefficient(R)were calculated and used as performance indicators.All three reanalysis products demonstrate commendable performance.The correlation coefficients for wind speed and wind direction exceed 0.83 and 0.90,respectively.Of the three products,the fifth-generation European Centre for Medium-Range Weather Forecasts reanalysis demonstrates the highest level of performance.The model demonstrated the lowest average BIAS and RMSE for wind speed,and the highest R for wind direction.The findings indicate that product performance is subject to variation in both season and wind speed. 展开更多
关键词 sea surface wind field reanalysis data buoy data Bohai and Yellow Seas
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A Hybrid CNN-BiLSTM Framework for Speech Emotion Recognition with TimeGAN-Augmented Data and Contrastive Learning 认领 引用
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作者 Rashid Jahangir Muhammad Asif Nauman +1 位作者 Oumaima Saidani Faisal Ramzan 《Computers, Materials & Continua》 SCIE EI 2026年第9期775-794,共20页
Speech Emotion Recognition(SER)is a critical component of affective computing with broad applications in human–computer interaction,mental health monitoring,and intelligent multimedia systems.However,SER remains chal... Speech Emotion Recognition(SER)is a critical component of affective computing with broad applications in human–computer interaction,mental health monitoring,and intelligent multimedia systems.However,SER remains challenging due to the emotional ambiguity,lack of labeled data,class imbalance,and speaker variability.This study presents an effective SER framework that integrates contrastive representation learning,optimized spectrogram-based data augmentation,and selective synthetic data generation by using TimeGAN to enhance emotion classification performance.Contrastive learning enables the model to better discriminate acoustically similar emotions while Optuna automatically tunes augmentation strategies such as noise injection,time shifting,and time-frequency masking.Unlike existing approaches that apply synthetic generation uniformly across all classes,the proposed method targets only confusing or under-represented emotion classes to preserve the inter-class separability.A CNN-BiLSTM architecture is used to extract spectral and temporal information of the speech.The framework is evaluated with benchmark SER datasets—EMO-DB and RAVDESS—under speaker independent protocols.Experimental results demonstrate improved accuracy,robustness,and generalization under limited and imbalanced data conditions,supported by confusion matrices,UMAP,and t-SNE visualizations. 展开更多
关键词 Speech emotion recognition data augmentation optuna TimeGAN synthetic data contrastive learning
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Curation and featurization of multiple topological materials databases 认领 引用
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作者 Yuqing He Matteo Giantomassi +1 位作者 Gian-Marco Rignanese Hongming Weng 《Chinese Physics B》 SCIE EI CAS CSCD 2026年第5期175-185,共11页
The discovery of topological materials has advanced rapidly due to high-throughput computation and machine learning,but research progress is hampered by inconsistent classification standards and fragmented data resour... The discovery of topological materials has advanced rapidly due to high-throughput computation and machine learning,but research progress is hampered by inconsistent classification standards and fragmented data resources.Existing databases differ in computational methods,material coverage,and labeling criteria,making it difficult to compare findings across studies.To overcome these challenges,we present a unified topological materials dataset that systematically combines and reconciles two major databases:Materiae and the Topological Materials Database.This dataset provides consistent topological classifications for 35608 materials,accessible through the Materials Galaxy platform for interactive exploration and available for bulk download via MatElab.We describe the featurization methodology that converts crystal structures into 4710 machine-learning-ready descriptors and present a comprehensive analysis of topological material distributions.This work serves as a complete guide for accessing,utilizing,and interpreting this unified resource,designed to enable reproducible machine learning applications and accelerate the discovery of topological materials. 展开更多
关键词 data topological materials machine learning
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Ok Null Test with Multi-Task Gaussian Processes:Cosmic Curvature and Data Compatibility 认领 引用
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作者 Yungui Gong Qing Gao +1 位作者 Xuchen Lu Zhu Yi 《Chinese Physics Letters》 SCIE EI CAS CSCD 2026年第5期414-421,共8页
The Ok null test can not only assess whether the cosmic curvature is zero—thereby,if true,reducing degeneracies between cosmic curvature and other cosmological parameters—but also provide a model-independent chec... The Ok null test can not only assess whether the cosmic curvature is zero—thereby,if true,reducing degeneracies between cosmic curvature and other cosmological parameters—but also provide a model-independent check of compatibility between different data sets.However,traditional implementations often require absolute distance data from Type Ia supernovae(SNe Ia)or baryon acoustic oscillation(BAO)measurements,limiting their applicability because such absolute distance data are usually not accessible.The BAO Alcock-Paczynski(AP)parameter FAP is a measurement of a distance ratio,making the Dark Energy Spectroscopic Instrument(DESI)AP measurements particularly well suited for the Oknull test,as no absolute distance measurements are required.We propose a novel null test of cosmic curvature tailored to DESI BAO data that combines FAPwith ratios such as D′V/DVor D′M/DM.Crucially,this construction eliminates the need for absolute distance measurements.We further develop multi-task Gaussian processes to perform the null test.This approach can also be applied to a joint DESI BAO and SNe Ia dataset,and we find that DESI BAO and SNe Ia data are compatible.Although there is~2σ evidence of nonzero curvature at low redshift z■0.5,this result is not conclusive,largely due to the lack of observational data in the corresponding redshift range. 展开更多
关键词 baryon acoustic oscillation bao measurementslimiting multi task Gaussian processes type ia supernovae sne data setshowevertraditional data compatibility absolute distance data cosmic curvature assess whether cosmic curvature zero therebyif
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Identification of the optimal phenological periods for summer maize yield prediction using UAV-based multispectral data 认领 引用
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作者 Qin Dai Hong Chen +4 位作者 Ziqiang Chen Chang Liu Gaoliang Li Yakun Wang Xiaotao Hu 《Journal of Integrative Agriculture》 SCIE CAS CSCD 2026年第6期2396-2413,共18页
Timely and accurate forecasting of crop yields is critical for food management and trade.However,only limited research has explored the impact of integrating crop phenotypic parameters(CPPs)with unmanned aerial vehicl... Timely and accurate forecasting of crop yields is critical for food management and trade.However,only limited research has explored the impact of integrating crop phenotypic parameters(CPPs)with unmanned aerial vehicle(UAV)data across different phenological stages on maize yield prediction.The extent to which multi-temporal data enhances the accuracy and reliability of yield projections compared to mono-temporal data has yet to be systematically investigated.To attain the proper balance between accuracy and cost in crop yield estimation,this study proposed a structured framework for identifying the optimal phenological periods for summer maize yield prediction using UAV-based multispectral data.Three classical methods of custom mean decrease accuracy(C-MDA),optimal parameters-based geographical detector(OPGD),and grey relational analysis(GRA)were first used to sort and screen both the CPPs and vegetation indices(VIs)derived from UAV-based information over six growth stages.Ridge regression models based on multi-temporal data combinations and mono-temporal data were established separately,and their performance in yield prediction were compared to identify the optimal phenological stages and the corresponding key factors.Our results showed that C-MDA was much better at factor screening and ranking compared to OPGD and GRA.The green normalized difference vegetation index(GNDVI),normalized difference vegetation index(NDVI),and normalized difference red edge index(NDRE)emerged as the topperforming VIs,while the leaf area index(LAI)and above ground biomass(AGB)proved to be the most effective CPPs.When predicting yield using only mono-temporal data,the dough stage delivered the highest predictive accuracy(R2=0.871,RMSE=0.407 t ha-1),while the tasseling stage was the earliest that achieved yield estimates with acceptable precision(R2=0.810,RMSE=0.493 t ha-1).In contrast,the integration of UAV data from different crop growth stages markedly enhanced the accuracy of yield estimation.Combinations of data from the tasseling,silking,and dough stages were recommended as the best option(R2=0.942,RMSE=0.291 t ha-1).These findings indicate that the precise estimation of maize yields in smallholder fields may be attainable,and present both substantial theoretical insights and practical benefits for the advancement of precision agriculture. 展开更多
关键词 UAV yield estimation multispectral data geographical detector
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A Realistic Synthetic Galaxy Image Superresolution Dataset Based on IllustrisTNG 认领 引用
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作者 Jiawei Miao Liangping Tu +4 位作者 Jianxi Li Hao Liu Jian Zhao Yiyang Ding Zhenyang Xu 《Research in Astronomy and Astrophysics》 SCIE CAS CSCD 2026年第5期1-12,共12页
To overcome the limitations of ground-based telescopes in spatial resolution and imaging quality, recent researchhas concentrated on image super-resolution (SR) reconstruction. This approach aims to enhance ground-bas... To overcome the limitations of ground-based telescopes in spatial resolution and imaging quality, recent researchhas concentrated on image super-resolution (SR) reconstruction. This approach aims to enhance ground-basedimages by recovering “space-based-like” images with higher spatial resolution and more detailed structuralinformation, without the need for expensive space-based observations. The training of SR models typically relieson large-scale, high-quality paired datasets of ground-based and space-based images. However, the acquisition ofsuch data is highly costly, which significantly limits the widespread application of these models. Based on this,this paper proposes using realistic synthetic galaxy images generated by IllustrisTNG cosmological simulation toreplace real space-based images and constructs a training dataset for image SR tasks, TNG-RealSR. To verify thevalidity of this dataset, we selected five mainstream lightweight SR models for evaluation. The results show thatTNG-RealSR exhibits good applicability in the task of galaxy image SR, providing reliable data support forrelated research. To the best of our knowledge, this work is the first to apply cosmological simulation-generatedsynthetic galaxy images to the field of galaxy image SR, demonstrating the feasibility of deep learning methodsbased on synthetic data for astronomical image enhancement tasks. This provides a low-cost and efficient solutionfor improving data quality in future large-scale surveys. The dataset is available online at http://gffzz188fe103f8f1460asbuw5coponu506pwn.ffgz.tsg.suse.edu.cn/jiaweimmiao/TNG-RealSR. 展开更多
关键词 methods data analysis-techniques image processing-astronomical databases miscellaneous-Galaxy general
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