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Improved particle swarm optimization based on particles' explorative capability enhancement

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Journal of Systems Engineering and Electronics 2016年第4期27卷 900-911页

作者： Yongjian yang Xiaoguang Fan Zhenfu Zhuo shengda Wang Jianguo Nan Wenkui Chu Aeronautics and Astronautics Engineering College Air Force Engineering University

Accelerating the convergence speed and avoiding the local optimal solution are two main goals of particle swarm optimization（PSO）. The very basic PSO model and some variants of PSO do not consider the enhancement of the explorative capability of each particle. Thus these methods have a slow convergence speed and may trap into a local optimal solution. To enhance the explorative capability of particles, a scheme called explorative capability enhancement in PSO（ECE-PSO） is proposed by introducing some virtual particles in random directions with random amplitude. The linearly decreasing method related to the maximum iteration and the nonlinearly decreasing method related to the fitness value of the globally best particle are employed to produce virtual particles. The above two methods are thoroughly compared with four representative advanced PSO variants on eight unimodal and multimodal benchmark problems. Experimental results indicate that the convergence speed and solution quality of ECE-PSO outperform the state-of-the-art PSO variants.

关键词： convergence speed particle swarm optimization(PSO) explorative capability enhancement solution quality

Evaluation of the inhibition behavior of carbon dots on carbon steel in HCl and NaCl solutions

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Journal of Materials Science & Technology 2020年第8期36卷 144-153页

作者： Yuwei Ye Zilong Jiang yangjun Zou Hao Chen shengda Guo Qiumin yang Liyong Chen Faculty of Materials Metallurgy and Chemistry Jiangxi University of Science and TechnologyGanzhou341000China

An eco-friendly and effective corrosion inhibitor(N-CDs)was acquired by hydrothermal method in methacrylic acid and ethyl(methyl)amine ***,the weight loss and electrochemistry measurement were chosen to appraise the corrosion inhibition behavior of as-prepared N-CDs for Q235 steel in Cl-contained *** change rules of EIS and Tafel data displayed that the as-prepared N-CDs revealed a high-efficiency protection for steel in all test ***,the inhibition efficiency of steel reached up to 93.93%(1 M HCl)and 88.96%(3.5 wt%Na Cl)at 200 mg/L of ***,the N-CDs could form the adsorption film on steel surface to avoid the strong attack of Cl-.By analysis,the adsorption mechanism of as-prepared N-CDs on steel surface was physicochemical interaction,which strictly complied with the Langmuir adsorption model in both solutions.

关键词： Carbon dots Adsorption film Corrosion protection

Amended Kalman Filter for Maneuvering Target Tracking

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Chinese Journal of Electronics 2016年第6期25卷 1166-1171页

作者： yang Yongjian FAN Xiaoguang ZHUO Zhenfu WANG shengda NAN Jianguo XU Yunshan Aeronautics and Astronautics Engineering College Air Force Engineering University

The conventional Kalman filter(KF) which uses the current measurement to estimate the current state is a posterior estimation. KF is identified as the optimal estimation in linear models with Gaussian noise. However,the performance of KF with incomplete information may be degraded or diverged. In order to improve the performance of KF, an Amended KF(AKF) is proposed by using more posterior measurements. The principle, derivation and recursive process of AKF are presented. The differences among Kalman smoother, adaptive fading method and AKF are analyzed. The simulation results of target tracking with different covariance of motion model indicate the high precision and robustness of AKF.

关键词： Kalman filter(KF) Incomplete information Amended KF(AKF) Maneuvering target tracking

Population-influenced spatiotemporal pattern of natural disaster and social crisis in China, AD1–1910

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Science China Earth Sciences 2019年第7期62卷 1138-1150页

作者： shengda ZHANG David Dian ZHANG Department of Geography The University of Hong Kong School of Geographical Sciences Guangzhou University

Researchers mostly ascribe contemporary natural disaster and the concomitant social crisis to anomalous climate change or global warming. However, whether such a relationship is still valid in long-term historical settings remains doubtful. In this study, data obtained from historical records about natural calamities(flood and drought) and their social impacts(famine,cannibalism, and war) at provincial and decadal scales during AD1–1910 are applied to mathematical statistics such as correlation and regression analysis as well as spatial visualization. Also, the role of population in the nexus of meteorological catastrophes and human miseries is investigated. Results show that at the provincial scale, generally there is high consistency among different variables and most of them are clustered in eastern part of China, especially in the north. More in-depth examinations indicate regional disparities that variables account for higher proportion in the south during the later imperial era,which may be attributed to the southward movement of population center. At the decadal scale, drought is the primary contributor to famine and cannibalism, while severe or even out-of-control famine i.e. cannibalism is more likely to incur war than ordinary famine per se. Besides, population growth rate exerts its positive effect on natural hazards and food crises, whereas more wars bring population loss and relieve population stress despite the weak negative association. These findings supplement previous views and confirm that the distributions of disasters in ancient China are affected by population rather than climatic variability, which only determines the occurrence of disaster.

关键词： Natural disaster Social crisis Population Spatiotemporal pattern Historical China

C19orf66 Inhibits Japanese Encephalitis Virus Replication by Targeting-1 PRF and the NS3 Protein

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Virologica Sinica 2021年第6期36卷 1443-1455页

作者： Du Yu Yundi Zhao Junhui Pan Xingmiao yang Zhenjie Liang shengda Xie Ruibing Cao MOE Joint International Research Laboratory of Animal Health and Food Safety College of Veterinary MedicineNanjing Agricultural UniversityNanjing 210095China

The Japanese encephalitis serogroup of the neurogenic Flavivirus has a specific feature that expresses a non-structural protein NS1'produced through a programmed-1 ribosomal frameshifting(-1 PRF).Herein,C19orf66,a novel member of interferon-stimulated gene(ISG)products,exhibited significant activity of antagonizing Japanese encephalitis virus(JEV)*** of C19orf66 in 293T cells significantly inhibited JEV replication,while knock-down of endogenous C19orf66 in HeLa cells and A549 cells significantly increased virus ***,C19orf66 had an inhibitory effect on frameshift production of JEV NS1'.The inhibition was more significant when C19orf66 and JEV NS1-NS2A were co-expressed in the 293T *** C19orf66-209 and C19orf66-Zinc^(mut) did not significantly change the NS1'to NS1 ratio and had weaker antiviral effects than ***,C19orf66-209 and C19orf66-Zinc^(mut) had no significant effect on the expression of the JEV NS3 protein,whose expression was down-regulated by C19orf66 via the lysosome-dependent *** findings suggest that C19orf66 may possess at least two different mechanisms of antagonizing JEV *** study identified C19orf66 as a novel interferon-stimulated gene product that can inhibit JEV replication by targeting-1 PRF and the NS3 *** study provides baseline information for the future development of broad-spectrum antiviral agents against JEV.

关键词： Japanese encephalitis virus(JEV) C19orf66 Programmed-1 ribosomal frameshifting(-1 PRF) NS1’ NS3

Japanese Encephalitis Virus NS2B-3 Protein Complex Promotes Cell Apoptosis and Viral Particle Release by Down-Regulating the Expression of AXL

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Virologica Sinica 2021年第6期36卷 1503-1519页

作者： shengda Xie Zhenjie Liang Xingmiao yang Junhui Pan Du Yu Tongtong Li Ruibing Cao MOE Joint International Research Laboratory of Animal Health and Food Safety College of Veterinary MedicineNanjing Agricultural UniversityNanjing210095China

Japanese encephalitis virus(JEV) is a flavivirus transmitted by mosquitoes that causes severe encephalitis in humans and animals. It has been suggested that AXL, a transmembrane protein, can promote the replication of various flaviviruses,such as dengue(DENV), Zika(ZIKV), and West Nile(WNV) viruses. However, the effect of AXL on JEV infection has not yet been determined. In the present study, we demonstrate that AXL is down-regulated after JEV infection in the late stage. JEV NS2B-3 protein specifically interacted with AXL, and promoted AXL degradation through the ubiquitin–proteasome pathway. AXL-degradation increased cell apoptosis by disrupting phosphatidylinositol 3-kinase(PI3 K)/Akt signal transduction. In addition, the degradation of AXL promoted JEV release to supernatant, whereas the virus in the cell lysates decreased. The supplementation of AXL ligand Gas6 inhibited the JEV-mediated degradation of AXL. Altogether,we discover a new function of NS2B-3 during the process of JEV replication, and provide a new insight into the interactions between JEV and cell hosts.

关键词： Japanese encephalitis virus(JEV) AXL NS2B-3 Cell apoptosis Virus release

儿童友好视角下城市湿地自然教育功能探索及其实现路径——以温州三垟湿地为例

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浙江林业科技 2024年第4期44卷 84-91页

作者：邵胜达章巧依温州市鹿城区综合行政执法局浙江温州325000 温州市自然资源和规划局生态园分局浙江温州325015

2023年,温州三垟湿地自然教育基地入选全国自然教育基地。在儿童友好城市建设的背景下,儿童自然教育作为儿童成长教育的一种新兴方式,逐渐受到关注。相比传统城市公园,城市湿地具有地理空间广阔、生物多样性丰富等天然优势,在儿童自然... 详细信息

2023年,温州三垟湿地自然教育基地入选全国自然教育基地。在儿童友好城市建设的背景下,儿童自然教育作为儿童成长教育的一种新兴方式,逐渐受到关注。相比传统城市公园,城市湿地具有地理空间广阔、生物多样性丰富等天然优势,在儿童自然教育功能上可发挥重要作用。本文从儿童友好背景入手,阐述了儿童友好、城市湿地、自然教育的概念与内涵,详细介绍了温州生态园通过打造国家级自然教育基地、院校合作助推自然课堂、丰富自然教育品牌活动、开设适儿性课程及活动、创新提升自然教育质量等实践探索研究三垟湿地自然教育功能;提出推进实现城市湿地自然教育功能的路径:发挥城市湿地资源优势、打造多元自然教育活动、增强儿童参与自然教育积极性、完善自然教育服务体系。

关键词：儿童友好自然教育城市湿地实践探索实现路径

政策工具视角下“全域禁摊—分类疏导”流动摊贩治理的地方实践和路径优化

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重庆城市管理职业学院学报 2024年第3期24卷 10-15页

作者：邵胜达章巧依温州市鹿城区综合行政执法局浙江温州325088 温州市自然资源和规划局生态园分局浙江温州325015

流动摊贩的存在并非一定不合法,其具备便利性、促进就业、经济等特点受到一部分居民的认可。聚焦流动摊贩治理的政策工具问题,有助于公共政策的完善和妥善解决流动摊贩合法生存的问题。基于自愿性、混合型、强制性政策工具的选择理论框... 详细信息

流动摊贩的存在并非一定不合法,其具备便利性、促进就业、经济等特点受到一部分居民的认可。聚焦流动摊贩治理的政策工具问题,有助于公共政策的完善和妥善解决流动摊贩合法生存的问题。基于自愿性、混合型、强制性政策工具的选择理论框架的分析,根据W市L区“全域禁摊—分类疏导”的流动摊贩治理地方实践个案经验,严格使用强制类政策工具、辅以使用自愿性政策工具、综合使用混合型政策工具是政策工具选择的路径优化方案。

关键词：流动摊贩政策工具选择理论地方实践路径优化

MIXED VARIATIONAL INEQUALITIES DRIVEN BY FRACTIONAL EVOLUTIONARY EQUATIONS

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Acta Mathematica Scientia 2019年第2期39卷 461-468页

作者： Stanislaw MIGóRSKI shengda ZENG College of Sciences Beibu Gulf University Jagiellonian University in Krakow Faculty of Mathematics and Computer Science Jagiellonian University in Krakow

The goal of the present paper is to investigate an abstract system, called fractional differential variational inequality, which consists of a mixed variational inequality combined with a fractional evolution equation in the framework of Banach spaces. Using discrete approximation approach, an existence theorem of solutions for the inequality is established under some suitable assumptions.

关键词： fractional differential variational inequality C_0-semigroup Minty mixed variational inequality existence mild solutions