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Variational Data Assimilation Method Using Parallel Dual Populations Particle Swarm Optimization Algorithm

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Wuhan University Journal of Natural Sciences 2024年第1期29卷 59-66页

作者： WU Zhongjian LI Junyan Detroit Green institute of Technology Hubei University of TechnologyWuhan 430068HubeiChina School of Information management Central China Normal UniversityWuhan 430079HubeiChina

In recent years,numerical weather forecasting has been increasingly *** data assimilation furnishes precise initial values for numerical forecasting models,constituting an inherently nonlinear optimization *** enormity of the dataset under consideration gives rise to substantial computational burdens,complex modeling,and high hardware *** paper employs the Dual-Population Particle Swarm Optimization(DPSO)algorithm in variational data assimilation to enhance assimilation *** harnessing parallel computing principles,the paper introduces the Parallel Dual-Population Particle Swarm Optimization(PDPSO)Algorithm to reduce the algorithm processing *** were carried out using partial differential equations,and comparisons in terms of time and accuracy were made against DPSO,the Dynamic Weight Particle Swarm Algorithm(PSOCIWAC),and the TimeVarying Double Compression Factor Particle Swarm Algorithm(PSOTVCF).Experimental results indicate that the proposed PDPSO outperforms PSOCIWAC and PSOTVCF in convergence accuracy and is comparable to *** processing time,PDPSO is 40%faster than PSOCIWAC and PSOTVCF and 70%faster than DPSO.

关键词： parallel algorithm variational data assimilation dual-population particle swarm optimization algorithm diffusion mechanism

Improved Scatter Search Algorithm for Multi-skilled Personnel Scheduling of Ship Block Painting

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Journal of Harbin institute of Technology(New Series) 2024年第1期31卷 1-15页

作者： Guanglei Jiao Zuhua Jiang Jianmin Niu Wenjuan Yu Department of Industrial Engineering and management Shanghai Jiao Tong UniversityShanghai 200240China Shanghai Ship Technology Research institute Shanghai 200032China

This paper focuses on the optimization method for multi-skilled painting personnel *** budget working time analysis is carried out considering the influence of operating area,difficulty of spraying area,multi-skilled workers,and worker’s efficiency,then a mathematical model is established to minimize the completion time. The constraints of task priority,paint preparation,pump management,and neighbor avoidance in the ship block painting production are considered. Based on this model,an improved scatter search(ISS)algorithm is designed,and the hybrid approximate dynamic programming(ADP)algorithm is used to improve search efficiency. In addition,the two solution combination methods of path-relinking and task sequence combination are used to enhance the search breadth and depth. The numerical experimental results show that ISS has a significant advantage in solving efficiency compared with the solver in small scale instances;Compared with the scatter search algorithm and genetic algorithm,ISS can stably improve the solution quality. Verified by the production example,ISS effectively shortens the total completion time of the production,which is suitable for scheduling problems in the actual painting production of the shipyard.

关键词： ship painting personnel scheduling multi⁃skilled workers scatter search task constraints

Catch organism assemblages along artificial reefs area and adjacent waters in Haizhou Bay

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Acta Oceanologica Sinica 2024年第2期43卷 34-42页

作者： Shike Gao Bin Xie Chengyu Huang Xiao Zhang Shuo Zhang Wenwen Yu College of Marine Living Resource Sciences and management Shanghai Ocean UniversityShanghai 201306China Jiangsu Research institute of Marine Fisheries Nantong 226007China Third institute of Oceanography Ministry of Natural ResourcesXiamen361005China Joint Laboratory for Monitoring and Conservation of Aquatic Living Resources In the Yangtze Estuary Shanghai 200000China

To better understand the community patterns mediated by connectivity in artificial reefs of coastal areas, it is necessary to understand the distribution and coexistence of organisms with artificial reefs area and adjacent waters. This study was conducted to examine main catches assemblages collected by trawls in Haizhou Bay,which included five habitats: the artificial reef area(AR), aquaculture area(AA), natural area(NA), estuary area(EA) and comprehensive effect area(CEA). The result shows that the total abundances of species in the five habitats were highly different(univariate PERMANOVA: P = 0.001, n = 24), but some species were also unique in their habitat(e.g. Scapharca subcrenata and Glossaulax didyma in AA). The body size distribution of specific species between habitats are different. For Collichthys lucidus, their body size in AR(14.63 cm ± 1.64 cm) and EA(14.3 cm ± 0.85 cm) is higher than that in NA(10.65 cm ± 1.64 cm), CEA(11.28 cm ± 1.85 cm) and AA(12.1 cm ±0.43 cm), which indicates the potential connection from AR to EA mediated by their adult population. We concluded that artificial reefs in AR can be considered key components that have the ability to support species assemblages in adjacent habitats. This study has implications for the conservation and monitoring of species assemblages in coastal areas in terms of that artificial reefs can be applied in different stages of habitat protection implementation and in different combinations of scenarios.

关键词： assemblage artificial reefs adjacent water Haizhou Bay

Resistance development,cross-resistance,and fitness costs associated with Aphis gossypii resistance towards sulfoxaflor and acetamiprid in different geographical regions

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Journal of Integrative Agriculture 2024年第7期23卷 2332-2345页

作者： Wei Wang Renfu Zhang Haiyang Liu Ruifeng Ding Qiushi Huang Ju Yao Gemei Liang Key Laboratory of Integrated Pest management on Crop in Northwestern Oasis of Ministry of Agriculture and Rural Affairs Institute of Plant ProtectionXinjiang Academy of Agricultural SciencesUrumqi 830091China State Key Laboratory for Biology of Plant Diseases and Insect Pests Institute of Plant ProtectionChinese Academy of Agricultural SciencesBeijing 100193China

Aphis gossypii has become increasingly difficult to manage due to its strong insecticide *** the laboratory,we established sulfoxaflor-resistant and acetamiprid-resistant strains in two *** populations with different basal insecticide resistance levels,and evaluated the effects of basal insecticide resistance on the resistance development and cross-resistance,as well as differences in *** the same selection pressure,Yarkant ***(with low basal insecticide resistance)evolved resistance to sulfoxaflor and acetamiprid more quickly than Jinghe ***(with high basal insecticide resistance),and the evolution of *** resistance to sulfoxaflor developed faster than acetamiprid in both Yarkant and Jinghe,Xingjiang,*** sulfoxaflor-resistant strains selected from Yarkant and Jinghe developed significant cross-resistance to acetamiprid,imidacloprid,thiamethoxam and pymetrozine;while the acetamiprid-resistant strains developed significant cross-resistance to sulfoxaflor,imidacloprid,thiamethoxam,pymetrozine,and *** relative fitness of *** decreased as the resistance to sulfoxaflor and acetamiprid *** relative fitness levels of the sulfoxaflor-resistant strains(Yarkant-SulR and Jinghe-SulR)were lower than those of the acetamipridresistant strains(Yarkant-AceR and Jinghe-AceR).In addition,the relative fitness levels of sulfoxaflor-and acetamiprid-resistant strains were lower in Jinghe than in *** summary,basal insecticide resistance of *** and insecticide type affected the evolution of resistance to insecticides in ***,as well as cross-resistance to other *** sulfoxaflor-and acetamiprid-resistant *** strains had obvious fitness *** results of this work will contribute to the insecticide resistance management and integrated management of ***.

关键词： Aphis gossypii sulfoxaflor acetamiprid cross-resistance fitness costs different sensitivities

Spatiotemporal Evolution and Linkage Analysis of Mutton Price in Xinjiang

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Journal of Systems Science and Information 2024年

作者： Yulin YANG Jian XU Lean YU School of Economics and management University of Chinese Academy of Sciences Business School Sichuan University School of Business Shenzhen Institute of Technology

The mutton industry plays a pivotal role in the animal husbandry industry of Xinjiang Uygur Autonomous Region. To better monitor the volatility movement and risk warning of mutton price, the fluctuation characteristics of mutton prices and the future trend of prices are analyzed systematically. On the one hand, the Hodrick Prescott(HP) filter method is used to analyze the longterm trends and cyclical characteristics of mutton prices in Xinjiang and explored the spatial evolution characteristics of mutton price fluctuations in various regions of Xinjiang. On the other hand, the Threshold Auto-Regressive(TAR) model is used to analyze the linkage relationship between mutton prices and the prices of other livestock products. The empirical results show that(1) the overall volatility of mutton price in Xinjiang is high, showing a trend of rising first, then falling and then rising from the temporal perspective.(2) At the regional level, the price in the south is higher than that of the north, showing a decreasing trend from south to north on the whole from the spatial viewpoint.(3) From the linkage relationship perspective, mutton and beef are complementary in the short term,but they are substitutes each other in the long term. This paper explores the characteristics of mutton price fluctuations in Xinjiang from the single time series of mutton prices and the linkage with other livestock products, which provides a reliable basis for the monitoring and risk warning of mutton price fluctuation.

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Impact of atmospheric circulations on droughts and drought propagation over China

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Science China Earth Sciences 2024年第8期67卷 2633-2648页

作者： Ziye GU Lei GU Jiabo YIN Wei FANG Lihua XIONG Jun GUO Ziyue ZENG Jun XIA School of Civil and Hydraulic Engineering Huazhong University of Science and TechnologyWuhan 430074China State Key Laboratory of Water Resources Engineering and management Wuhan 430072China Changjiang River Scientific Research institute Wuhan 430010China

The GRACE satellite mission provides a new approach for monitoring,tracking,and assessing drought conditions by detecting changes in Earth's gravitational fields and inversing signals of terrestrial water storage *** studies of terrestrial water storage anomalies related droughts paid rare attention to the behind atmospheric physical mechanisms,nor quantified the risk propagation patterns between terrestrial water storage deficits and hydrological or agricultural *** this study,we first extract terrestrial water storage(TWS) droughts,hydrological droughts,and agricultural droughts by using multiple variables including TWS from the GRACE/GRACE-FO satellites,runoff and soil moisture from the ERA5-Land reanalysis *** then identify key atmospheric and oceanic oscillation indices affecting water deficits by employing machine learning *** characterize the joint distributions between drought duration and severity by using the Copula function and quantify the risk propagation of hydrological and agricultural droughts to TWS *** results show that:(1) From 2002 to 2021,there is a significant decrasing trend of TWS in China;the WPIO group atmospheric circulation indices(sea surface temperature index within the Western Pacific and Indian Ocean) contributes the most to ***,the sea surface temperature anomalies within the NINO 3.4 region as well as the Western Pacific Warm Pool area index show significantly positive correlation relationships with TWS in southern China;(2) The northwestern China,the Yangtze River basin,and the downstream of the Pearl River basin are the hotspots of TWS ***,the hotspots of hydrological droughts locate in northwestern China and the hotspots of agricultural droughts locate in South China and eastern Tibetan Plateau;(3) The elastic coefficients of hydrological droughts propagating to TWS droughts are higher than those of agricultural droughts,indicating that the TWS droughts

关键词： GRACE satellites Drought Drought propagation Atmospheric circulation Copula function

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Enhancing transboundary natural tourism resources governance:unveiling the spatial pattern and its influencing factors

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Journal of Mountain Science 2024年第3期21卷 973-986页

作者： ZHANG Shengrui ZHANG Tongyan JU Hongrun WANG Yingjie management College Ocean University of ChinaQingdao 266100China School of Tourism and Geography Science Qingdao UniversityQingdao 266071China institute of Geographic Sciences and Natural Resources Research Chinese Academy of SciencesBeijing 100101China

Tourism resources that span provincial boundaries in China play a pivotal role in regional development,yet effective governance poses persistent *** study addresses this issue by constructing a comprehensive database of transboundary natural tourism resources(TNTR)through amalgamation of diverse data *** the Getis-Ord Gi^(*),kernel density estimation,and geographical detectors,we scrutinize the spatial patterns of TNTR,focusing on both named and unnamed entities,while exploring the influencing *** findings reveal 7883 identified TNTR in China,with mountain tourism resources emerging as the predominant *** provinces,Hunan boasts the highest count,while Shanghai exhibits the *** China demonstrates a pronounced clustering trend in TNTR distribution,with the spatial arrangement of biological landscapes appearing more random compared to geological and water *** China,characterized by intricate terrain,exhibits fewer TNTR,concurrently unveiling a significant presence of unnamed natural tourism ***,administrative segmentation influences TNTR development,generating disparities in regional goals,developmental stages and intensities,and management *** response to these variations,we advocate for strengthening the naming of the unnamed transboundary tourism resources,constructing a geographic database of TNTR for government and establishing a collaborative management mechanism based on TNTR *** research contributes to elucidating the intricate landscape of TNTR,offering insights for tailored governance strategies in the realm of cross-provincial tourism resource management.

关键词： Transboundary natural tourism resources(TNTR) Spatial difference Spatial autocorrelation Governance optimization China

Effect of vinegar supplementation on patients with esophageal lesions lightly stained with Lugol’s iodine solution:Prospective single-centre trial

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World Journal of Gastrointestinal Endoscopy 2024年第5期16卷 259-272页

作者： Yuan Gao Lian-Song Ye Xu Li Bin Yu Ke Liao Jia Xie Jiang Du Qiong-Ying Zhang Bing Hu Department of Gastroenterology and Hepatology Digestive Endoscopy Medical Engineering Research LaboratoryWest China HospitalMed-X Center for MaterialsSichuan UniversityChengdu 610041Sichuan ProvinceChina Design Measurement and Evaluation(CBDME)Department of Clinical Research ManagementWest China HospitalSichuan UniversityChengdu 610041Sichuan ProvinceChina institute for disaster management and reconstruction Sichuan University-The Hong Kong Polytechnic UniversityChengdu 610065Sichuan ProvinceChina West China School of Public Health and West China Fourth Hospital Sichuan UniversityChengdu 610044Sichuan ProvinceChina Precision Medicine Research Center West China HospitalSichuan UniversityChengdu 610041Sichuan ProvinceChina

BACKGROUND Esophageal chromoendoscopy with iodine solution is important for detecting early esophageal *** effect of routine treatment for lesions lightly stained with Lugol’s iodine solution is limited,and the addition of natural substances to a regular diet is becoming increasingly *** has antitumor effects as reported in previous *** To evaluate whether vinegar supplementation could improve the prognosis of patients with lightly stained esophageal *** prospective single-centre trial included consecutive patients with lightly stained lesions between June 2020 and April *** in the experimental group received increased amounts of vinegar for 6 *** primary outcome of the study was the clinical therapeutic *** related to vinegar ingestion and adverse events were also recorded in *** A total of 166 patients were included in the final *** was no significant difference in the baseline data between the two ***-to-treat(ITT)analysis demonstrated that the rates at which endoscopic characteristics improved were 33.72%in the experimental group and 20.00%in the conventional group(P=0.007);and the rates at which biopsy pathology improved were 19.77%and 8.75%,respectively(P=0.011).Additional vinegar consumption had a statistically protective effect on the rate at which endoscopic characteristics improved[hazard ratio(HR)_(ITT)=2.183,95%CI:1.183-4.028;HR_(per-protocol(PP))=2.307,95%CI:1.202-4.426]and biopsy pathology improved(HR_(ITT)=2.931,95%CI:1.212-7.089;HR_(PP)=3.320,95%CI:1.295-8.507).No statistically significant effect of increased vinegar consumption on preventing high-grade intraepithelial neoplasia or early cancer was observed(HR_(ITT)=0.382,95%CI:0.079-1.846;HRPP=0.382,95%CI:0.079-1.846).The subgroup analyses indicated that the overall therapeutic improvement of endoscopic characteristics and biopsy pathology seemed more obvious in older(age>60)male patients w

关键词： Chromoendoscopy Esophageal squamous epithelium Vinegar Atypical hyperplasia Prognosis

Point Cloud Classification Using Content-Based Transformer via Clustering in Feature Space

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IEEE/CAA Journal of Automatica Sinica 2024年第1期11卷 231-239页

作者： Yahui Liu Bin Tian Yisheng Lv Lingxi Li Fei-Yue Wang the State Key Laboratory for management and Control of Complex Systems Institute of AutomationChinese Academy of SciencesBeijing 100190 the School of Artificial Intelligence University of Chinese Academy of SciencesBeijing 100190 IEEE the Transportation and Autonomous Systems institute(TASI)and the Department of Electrical and Computer Engineering Purdue School of Engineering and TechnologyIndiana University-Purdue University Indianapolis(IUPUI)Indianapolis 46202 USA

Recently, there have been some attempts of Transformer in 3D point cloud classification. In order to reduce computations, most existing methods focus on local spatial attention,but ignore their content and fail to establish relationships between distant but relevant points. To overcome the limitation of local spatial attention, we propose a point content-based Transformer architecture, called PointConT for short. It exploits the locality of points in the feature space(content-based), which clusters the sampled points with similar features into the same class and computes the self-attention within each class, thus enabling an effective trade-off between capturing long-range dependencies and computational complexity. We further introduce an inception feature aggregator for point cloud classification, which uses parallel structures to aggregate high-frequency and low-frequency information in each branch separately. Extensive experiments show that our PointConT model achieves a remarkable performance on point cloud shape classification. Especially, our method exhibits 90.3% Top-1 accuracy on the hardest setting of ScanObjectN N. Source code of this paper is available at https://***/yahuiliu99/PointC onT.

关键词： Content-based Transformer deep learning feature aggregator local attention point cloud classification