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An Imbalanced Data Classification Method Based on Hybrid Resampling and Fine Cost Sensitive Support Vector Machine

Computers, Materials & Continua 2024年第6期79卷 3977-3999页

作者： Bo Zhu Xiaona Jing Lan Qiu Runbo Li College of Mechanical and Electrical Engineering Kunming University of Science&TechnologyKunming650500China

When building a classification model,the scenario where the samples of one class are significantly more than those of the other class is called data *** imbalance causes the trained classification model to be in favor of the majority class(usually defined as the negative class),which may do harm to the accuracy of the minority class(usually defined as the positive class),and then lead to poor overall performance of the model.A method called MSHR-FCSSVM for solving imbalanced data classification is proposed in this article,which is based on a new hybrid resampling approach(MSHR)and a new fine cost-sensitive support vector machine(CS-SVM)classifier(FCSSVM).The MSHR measures the separability of each negative sample through its Silhouette value calculated by Mahalanobis distance between samples,based on which,the so-called pseudo-negative samples are screened out to generate new positive samples(over-sampling step)through linear interpolation and are deleted finally(under-sampling step).This approach replaces pseudo-negative samples with generated new positive samples one by one to clear up the inter-class overlap on the borderline,without changing the overall scale of the *** FCSSVM is an improved version of the traditional *** considers influences of both the imbalance of sample number and the class distribution on classification simultaneously,and through finely tuning the class cost weights by using the efficient optimization algorithm based on the physical phenomenon of rime-ice(RIME)algorithm with cross-validation accuracy as the fitness function to accurately adjust the classification *** verify the effectiveness of the proposed method,a series of experiments are carried out based on 20 imbalanced datasets including both mildly and extremely imbalanced *** experimental results show that the MSHR-FCSSVM method performs better than the methods for comparison in most cases,and both the MSHR and the FCSSVM played significan

关键词： Imbalanced data classification Silhouette value Mahalanobis distance RIME algorithm CS-SVM

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Online collaborative estimation technology for SOC and SOH of frequency regulation of a lead-carbon battery in a power system with a high proportion of renewable energy

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Protection and Control of Modern Power Systems 2024年第1期9卷 52-64页

作者： Hongchun Shu Wenlong Li Guangxue Wang Yiming Han Jiannan Li Yutao Tang 不详 kunming University of Science and Technology Kunming 650000China Department of Electrical Engineering Kunming University of Science and TechnologyKunmingChina

In this paper,a collaborative online algo-rithm is proposed to estimate the state of charge(SOC)and state of health(SOH)of leadcarbon batteries that participate in frequency regulation of a power system with a high proportion of renewable *** algo-rithm addresses the inaccurate estimation of energy storage battery states caused by continuous and alter-nating charging and discharging over a short *** of lead-carbon battery chemistry and materials reveals that the resistance of the diaphragm is the most influential factor in battery *** addition,the hyste-resis characteristics of an energy storage battery vary significantly between the charging and discharging stages.A second-order RC equivalent circuit model is proposed that considers the contact and diaphragm resistances,and hysteresis *** on this,models for constant current charging interaction,constant voltage charging interaction,and dynamic discharging interaction are *** adaptive forgetting factor recursive least square(AFF-RLS)method is used to identify the parameters of the interactive *** an interactive multiple model with the embedded unscented Kalman filter(UKF)is used to estimate the SOC of the energy storage *** membrane and contact resistances identified by the interactive multi-model(IMM)are used to estimate the SOH,and online collaborative optimization of the SOC and SOH is *** error of the proposed SOC estimation method is experimentally verified to be within 2%,which is less than 5%of the standard value,and the error of SOH estimation is within 0.5%,demonstrating the high accuracy of the proposed method.

关键词： battery estimation SOC

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Drainage of paddy terraces impacts structures and soil properties in the globally important agricultural heritage of Hani Paddy Terraces,China

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International Soil and Water Conservation Research 2024年第1期12卷 64-76页

作者： Ming Wang Li Rong Yanbo Li Jiangcheng Huang Yuanmei Jiao Xiaoyan Wei Institute of International Rivers and Eco-Security Kunming650500China Yunnan Key Laboratory of International Rivers and Transboundary Eco-Security Kunming650500China Power China kunming Engineering Corporation Limited Kunming650051China Department of Geography Yunnan Normal UniversityKunming650500China Yunnan Provincial Archives of Surveying and Mapping(Yunnan Provincial Geomatics Centre) Kunming650032China

Marginalization and abandonment of paddy terraces are widespread,but their effects on the sustainability of subsequent agricultural production are still *** Paddy Terraces,included in Globally Important Agriculture Heritage Systems,are threatened by paddy fields ***,changes in terrace structure,the productivity of topsoil(0-20 cm),and soil water holding capacity at 0-70 cm depth were determined in a case study of Hani Paddy Terraces in Amengkong River Basin in Yuanyang County in Southwestern China,which had been converted into dryland terraces for 2-14 *** results showed that:(1)The degree of terrace structures degradation exhibited a U-shaped curve with increasing time since draining,with those drained for 5-9 years having the best structure;(2)Soil productivity index decreased first and then increased with time after conversion;(3)Maximum water holding capacity at 0-70 cm soil depth dramatically decreased after conversion and such trend became increasingly obvious with increasing time since *** study revealed that drainage of paddy terraces along with associated changes in crop and field management led to an increase in soil productivity,but degradation of terrace structures and a decrease in water holding capacity will inhibit restoration to paddy *** findings enhance the understanding of the biophysical changes due to marginalization in paddy terraces.

关键词： Hani paddy terraces Terraces marginalization Terrace structure degradation Soil productivity Water holding capacity

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Early results of the integrative epigenomic-transcriptomic landscape of colorectal adenoma and cancer

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World Journal of Gastrointestinal Oncology 2024年第2期16卷 414-435页

作者： You-Wang Lu Zhao-Li Ding Rui Mao Gui-Gang Zhao Yu-Qi He Xiao-Lu Li Jiang Liu Department of Dermatology and Venereology The First Affiliated Hospital of Kunming Medical UniversityKunming 650032Yunnan ProvinceChina kunming Biological Diversity Regional Center of Large Apparatus and Equipments Public Technical Service CenterKunming Institute of ZoologyKunming 650223Yunnan ProvinceChina School of Stomatology Kunming Medical UniversityKunming 650500Yunnan ProvinceChina Genome Center of Biodiversity Kunming Institute of ZoologyChinese Academy of ScienceKunming 650223Yunnan ProvinceChina Department of Reproduction and Genetics The First Affiliated Hospital of Kunming Medical UniversityKunming 650032Yunnan ProvinceChina

BACKGROUND Aberrant methylation is common during the initiation and progression of colorectal cancer(CRC),and detecting these changes that occur during early adenoma(ADE)formation and CRC progression has clinical *** To identify potential DNA methylation markers specific to ADE and *** Here,we performed SeqCap targeted bisulfite sequencing and RNA-seq analysis of colorectal ADE and CRC samples to profile the epigenomic-transcriptomic *** Comparing 22 CRC and 25 ADE samples,global methylation was higher in the former,but both showed similar methylation patterns regarding differentially methylated gene positions,chromatin signatures,and repeated ***-grade CRC tended to exhibit elevated methylation levels in gene promoter regions compared to those in low-grade *** with RNA-seq gene expression data,we identified 14 methylation-regulated differentially expressed genes,of which only AGTR1 and NECAB1 methylation had prognostic *** Our results suggest that genome-wide alterations in DNA methylation occur during the early stages of CRC and demonstrate the methylation signatures associated with colorectal ADEs and CRC,suggesting prognostic biomarkers for CRC.

关键词： Colorectal cancer Epigenomic alteration Transcriptome Methylation-regulated differentially expressed genes

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Metamorphic P-T conditions and ages of garnet-biotite schists in the Dahongshan Group from the southwestern Yangtze Block

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Acta Geochimica 2024年第4期43卷 707-718页

作者： Jun-xiao Ma Guang-shu Yang Yong-feng Yan Xiao-Fei Xu Yun-hua Ren Hui Zhao Xiao-jun Zheng Yuan Qin Faculty of Land Resources Engineering Kunming University of Science and TechnologyKunming 650093China Geological Team 306 of Yunnan Non-Ferrous Metals Geological Bureau Kunming 650217China Yunnan Provincial Bureau of Non-Ferrous Geology Kunming 650051China

The Dahongshan Group,situated at the southwestern margin of the Yangtze Block,represents a geological unit characterized by relatively high-grade metamorphism in the *** paper investigates the garnet-biotite schist from the Laochanghe Formation of the Dahongshan Group,employing an integrated approach that includes petrological analysis,phase equilibrium modeling,and zircon U-Pb *** schist is mainly composed of garnet,biotite,plagioclase,quartz,rutile,and *** equilibrium modeling revealed the peak metamorphic conditions of 8-9 kbar and 635-675°*** further integrating the prograde metamorphic profile of garnet and geothermobarometric results,a clockwise P-T metamorphic evolution path is constructed,which includes an increase in temperature and pressure during the prograde ***-ICP-MS zircon U-Pb dating and zircon Ti thermometry constrains the post-peak metamorphic age of 831.2±7.2 *** with previously reported results,it is revealed that the southwestern margin of the Yangtze Block experienced a large-scale regional metamorphism during the Neoproterozoic(890-750 Ma),which is related to the collisional orogenic *** may be associated with the late-stage assembly of the Rodinia supercontinent or with local compression and subduction processes during the breakup of the Rodinia supercontinent.

关键词： Southwestern Yangtze Block Dahongshan Group Phase equilibrium modeling Zircon U-Pb dating Neoproterozoic metamorphism

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Recent Advances in Fault Diagnosis Techniques for Photovoltaic Systems:a Critical Review

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Protection and Control of Modern Power Systems 2024年第3期9卷 36-59页

作者： Bo Yang Ruyi Zheng Yiming Han Jianxiang Huang Miwei Li Hongchun Shu Shi Su Zhengxun Guo the School of Electrical Engineering Kunming University of Science and TechnologyKunmingChina kunming University of Science and Technology KunmingChina the School of Faculty of Electric Power Engineering Kunming University of Science and TechnologyKunming 650500China the kunming Bureau of CSG EHV Transmission Company KunmingChina the Power Science Research Institute of Yunnan Power Grid Co. LtdKunmingChina

If a failure in the components of a photovoltaic(PV)system,such as PV module,controller,inverter,load,cable,*** undetected and uncorrected,it can seriously affect the efficiency,safety,and reliability of the entire PV power *** addition,fires can occur if specific faults,such as arc,ground,and line-to-line faults remain ***,PV system(PVS)fault diagnoses are crucial for PV power plant reliability,efficiency,and *** fault diagnosis methods and techniques for PVS components have been *** addition,with the development of PV devices,more advanced and intelligent diagnostic technologies are continuously being researched and ***,a systematic and thorough analysis,summary,and conclusion are still urgently ***,this paper introduces the types,causes,and impacts of PVS faults,and reviews and discusses the methods proposed in the literature for PVS fault diagnosis,and in particular,failures in PV *** attention is paid to the optimization direction of various fault diagnosis methods under different priorities,and their limitations,feasibility,complexity,and ***,challenges and suggestions are put forward for future research.

关键词： PVS monitoring system PV fault types PV diagnosis review.

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Ionization Potential Depression Model for Warm/Hot and Dense Plasmas

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Chinese Physics Letters 2024年第8期41卷 45-57页

作者： Chensheng Wu Fuyang Zhou Jun Yan Xiang Gao Yong Wu Chunhua Zeng Jianguo Wang Institute of Applied Physics and Computational Mathematics Beijing 100088China Faculty of Science Kunming University of Science and TechnologyKunming 650500China

For warm/hot and dense plasmas(WDPs),ionization potential depression(IPD)plays a crucial role in determining its ionization balance and understanding the resultant microscopic plasma properties.A sophisticated and unified IPD model is necessary to resolve those existing discrepancies between theoretical and experimental ***,the applicability of those widely used IPD models nowadays is limited,especially for the nonlocal thermodynamic equilibrium(non-LTE)dense plasma produced by short-pulse *** this work,we propose an IPD model that considers inelastic atomic processes,in which three-body recombination and collision ionization processes are found to play a crucial role in determining the electron distribution and IPD for a *** IPD model is validated by reproducing latest experimental results of Al plasmas with a wide-range condition of 70 eV–700 eV temperature and 0.2–3 times solid density,as well as a typical non-LTE system of hollow Al *** is demonstrated that the present IPD model has a significant temperature dependence due to the consideration of the inelastic collision *** a lower computational cost and wider application range of plasma conditions,the proposed model is expected to provide a promising tool to study the ionization balance and the atomic processes,as well as the related radiation and particle transports properties of the WDP.

关键词： properties. collision determining

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A Deep Learning Framework for Mass-Forming Chronic Pancreatitis and Pancreatic Ductal Adenocarcinoma Classification Based on Magnetic Resonance Imaging

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Computers, Materials & Continua 2024年第4期79卷 409-427页

作者： Luda Chen Kuangzhu Bao Ying Chen Jingang Hao Jianfeng He Faculty of Information Engineering and Automation Kunming University of Science and TechnologyKunming650504China Department of Radiology Second Affiliated Hospital of Kunming Medical UniversityKunming650101China School of Physics and Electronic Engineering Yuxi Normal UniversityYuxi653100China

Pancreatic diseases, including mass-forming chronic pancreatitis (MFCP) and pancreatic ductal adenocarcinoma(PDAC), present with similar imaging features, leading to diagnostic complexities. Deep Learning (DL) methodshave been shown to perform well on diagnostic tasks. Existing DL pancreatic lesion diagnosis studies basedon Magnetic Resonance Imaging (MRI) utilize the prior information to guide models to focus on the lesionregion. However, over-reliance on prior information may ignore the background information that is helpful fordiagnosis. This study verifies the diagnostic significance of the background information using a clinical ***, the Prior Difference Guidance Network (PDGNet) is proposed, merging decoupled lesion andbackground information via the Prior Normalization Fusion (PNF) strategy and the Feature Difference Guidance(FDG) module, to direct the model to concentrate on beneficial regions for diagnosis. Extensive experiments inthe clinical dataset demonstrate that the proposed method achieves promising diagnosis performance: PDGNetsbased on conventional networks record an ACC (Accuracy) and AUC (Area Under the Curve) of 87.50% and89.98%, marking improvements of 8.19% and 7.64% over the prior-free benchmark. Compared to lesion-focusedbenchmarks, the uplift is 6.14% and 6.02%. PDGNets based on advanced networks reach an ACC and AUC of89.77% and 92.80%. The study underscores the potential of harnessing background information in medical imagediagnosis, suggesting a more holistic view for future research.

关键词： Pancreatic cancer pancreatitis background region prior normalization fusion feature difference guidance

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miR-30a-5p/PHTF2 axis regulates the tumorigenesis and metastasis of lung adenocarcinoma

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BIOCELL 2024年第4期48卷 581-590页

作者： LIJUAN ZHANG QINGYIN MENG LI ZHUANG QUAN GONG XIANDA HUANG XUEQIN LI SHIJUAN LI GUOQIN WANG XICAI WANG Department of Rehabilitation and Palliative Medicine The Third Affiliated Hospital of Kunming Medical UniversityYunnan Cancer HospitalKunmingChina Department of Pathology The Third Affiliated Hospital of Kunming Medical UniversityYunnan Cancer HospitalKunmingChina Emergency Department(Outpatient Chemotherapy Center) The Third Affiliated Hospital of Kunming Medical UniversityYunnan Cancer HospitalKunmingChina Department of Cancer BioTreatment Center The Third Affiliated Hospital of Kunming Medical UniversityYunnan Cancer HospitalKunmingChina Department of Cancer Institute The Third Affiliated Hospital of Kunming Medical UniversityYunnan Cancer HospitalKunmingChina

Background:Lung adenocarcinoma is a very pervasive histological form of lung cancers,and inhibiting metastasis is crucial for effective *** this investigation,we explored the functional interaction of miR-30a-5p and the putative transcription factor 2 of the homeodomain(PHTF2)in dictating the aggressiveness and metastasis of lung ***:We collected clinical samples to evaluate the expression patterns of miR-30a-5p and PHTF2 in lung adenocarcinoma along with normal *** experiments including cell count kit(CCK)-8 growth assay,apoptosis analysis,migration and invasion examinations were performed to assess the aggressiveness of lung adenocarcinoma ***,we examined tumorigenesis and metastasis in a nude mouse ***:MiR-30a-5p exhibited downregulation pattern in lung adenocarcinoma *** of miR-30a-5p mimic in lung adenocarcinoma cells resulted in the suppression of malignant ***,the administration of miR-30a-5p mimic also curbed tumorigenesis and metastasis of lung adenocarcinoma cells in animal ***,PHTF2 was found to be a molecular target of *** PHTF2 counteracted the tumor-suppressive effect of the miR-30a-5p ***:miR-30a-5p functions as a tumor-suppressive molecule while PHTF2 acts as an oncogenic factor in the development and metastasis of lung ***,targeting miR-30a-5p and PHTF2 could be developed into a promising therapeutic approach for inhibiting metastasis in lung adenocarcinoma.

关键词： Lung cancer Malignant phenotype Tumor formation Tumor suppressor Oncogene

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Stress triggering effect on the 2022 Honghe M_(S)5.0 earthquake with historical strong earthquakes

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Geodesy and Geodynamics 2024年第2期15卷 107-113页

作者： Mingce Wang Zifeng Liu Ruijie Luo Yunnan Earthquake Agency Kunming 650224China School of Earth Sciences Yunnan UniversityKunming 650504China

The 2022 Honghe M_(S)5.0 seismic event is intriguing due to its occurrence in the south of the Red River Fault,an area historically lacking seismic activities greater than M_(S)*** elucidate the seismogenic mechanism and scrutinize stress-triggered interactions,we calculated co-seismic and post-seismic Coulomb stress alterations induced by nine historical seismic events(M≥6.0).The analysis reveals that these substantial seismic events provoked co-seismic stress augmentations of 1.409 bar and postseismic stress increments of 0.159 *** seismic events,such as the 1833 Songming,1877Shiping,1913 Eshan,and 1970 Tonghai earthquakes,catalyzed the occurrence of the Honghe *** of heightened future seismic risk include the southern region of the Red River Fault and the eastern segments of the Shiping-Jianshui and Qujiang ***,we assessed the correlation between the spatial distribution of aftershocks and the Coulomb stress shift triggered by the mainshock,taking into account the influence of calculation parameter settings.

关键词： Honghe Ms5.0 earthquake Coulomb failurestress Stress triggering Historical strongearthquakes

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