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A Line Complex-Based Evolutionary Algorithm for Many-Objective Optimization

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IEEE/CAA Journal of Automatica Sinica 2023年第5期10卷 1150-1167页

作者： Liang Zhang Qi Kang Qi Deng luyuan xu Qidi Wu the Department of Control Science and Engineering Tongji UniversityShanghai 201804 the Jiangsu Province Support Software Engineering R&D Center for Modern Information Technology Application in Enterprise Suzhou 215104China the Shanghai Institute of Intelligent Science and Technology Tongji UniversityShanghai 200092China

In solving many-objective optimization problems(MaO Ps),existing nondominated sorting-based multi-objective evolutionary algorithms suffer from the fast loss of selection pressure.Most candidate solutions become nondominated during the evolutionary process,thus leading to the failure of producing offspring toward Pareto-optimal front with diversity.Can we find a more effective way to select nondominated solutions and resolve this issue?To answer this critical question,this work proposes to evolve solutions through line complex rather than solution points in Euclidean space.First,Plücker coordinates are used to project solution points to line complex composed of position vectors and momentum ones.Besides position vectors of the solution points,momentum vectors are used to extend the comparability of nondominated solutions and enhance selection pressure.Then,a new distance function designed for high-dimensional space is proposed to replace Euclidean distance as a more effective distancebased estimator.Based on them,a novel many-objective evolutionary algorithm(MaOEA)is proposed by integrating a line complex-based environmental selection strategy into the NSGAⅢframework.The proposed algorithm is compared with the state of the art on widely used benchmark problems with up to 15 objectives.Experimental results demonstrate its superior competitiveness in solving MaOPs.

关键词： Environmental selection line complex many-objective optimization problems(MaOPs) Plücker coordinate

Characteristics of the microbial communities regulate soil multi-functionality under different cover crop amendments in Ultisol

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Journal of Integrative Agriculture 2024年第6期23卷 2099-2111页

作者： Guilong Li Xiaofen Chen Wenjing Qin Jingrui Chen Ke Leng luyuan Sun Ming Liu Meng Wu Jianbo Fan Changxu xu Jia Liu Soil and Fertilizer&Resources and Environment Institute Jiangxi Academy of Agricultural SciencesNanchang 330200China Key Laboratory of Acidified Soil Amelioration and Utilization Ministry of Agriculture and Rural AffairsNanchang 330200China Ecological Experimental Station of Red Soil Chinese Academy of SciencesYingtan 335211China

The use of cover crops is a promising strategy for influencing the soil microbial consortium,which is essential for the delivery of multiple soil functions(i.e.,soil multifunctionality).Nonetheless,relatively little is known about the role of the soil microbial consortium in mediating soil multifunctionality under different cover crop amendments in dryland Ultisols.Here,we assessed the multifunctionality of soils subjected to four cover crop amendments(control,non-amended treatment;RD,radish monoculture;HV,hairy vetch monoculture;and RDHV,radish-hairy vetch mixture),and we investigated the contributions of soil microbial richness,network complexity,and ecological clusters to soil multifunctionality.Our results demonstrated that cover crops whose chemical composition differed from that of the main plant crop promoted higher multifunctionality,and the radish-hairy vetch mixture rendered the highest enhancement.We obtained evidence that changes in soil microbial richness and network complexity triggered by the cover crops were associated with higher soil multifunctionality.Specifically,specialized microbes in a key ecological cluster(ecological cluster 2)of the soil microbial network were particularly important for maintaining soil multifunctionality.Our results highlight the importance of cover crop-induced variations in functionally important taxa for promoting the soil multifunctionality of dryland Ultisols.

关键词： cover crops soil multifunctionality microbial richness network complexity ecological cluster

知识演化视角下论文与专利的热点技术方法对比分析——以人工智能自然语言处理领域为例

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科技管理研究 2024年第10期44卷 153-160页

作者：唐露源谢士尧徐源北京理工大学经济学院北京102488 北京大学健康医疗大数据国家研究院北京100191 北京理工大学教育学院北京102488

人工智能领域的研究成果在学术研究与工业实践之间转移流动。为揭示自然语言处理领域论文与专利中的技术方法的分布及其演化趋势,基于知识演化视角对比分析论文与专利技术方法的分布,将2013年1月到2022年12月arXiv数据集中自然语言处理... 详细信息

人工智能领域的研究成果在学术研究与工业实践之间转移流动。为揭示自然语言处理领域论文与专利中的技术方法的分布及其演化趋势,基于知识演化视角对比分析论文与专利技术方法的分布,将2013年1月到2022年12月arXiv数据集中自然语言处理领域的39025篇论文,以及按照“关键词+IPC分类号”的检索方法在incoPat专利数据库得到的14654件专利数作为样本,利用维基百科分类树构建方法本体,将论文和专利映射到领域本体中,并采用配对样本T检验方法验证两者知识演化方面的滞后性。结果表明:样本论文与专利存在共同关注的技术方法,包括卷积神经网络、循环神经网络、长短期记忆网络、注意力机制和预训练语言模型,其中前三者属于比较成熟的神经网络架构,而注意力机制随着上述神经网络架构的发展而迅速发展;专利技术方法相对论文滞后约1~2年。

关键词：人工智能自然语言处理知识演化神经网络技术方法文献计量专利分析

Self-supported porous heterostructure WC/WO_(3−x)ceramic electrode for hydrogen evolution reaction in acidic and alkaline media

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Journal of Advanced Ceramics 2022年第8期11卷 1208-1221页

作者： Feihong WANG Binbin DONG Junwei WANG Nianwang KE Chuntian TAN Anding HUANG Yutong WU luyuan HAO Liangjun YIN Xin xu Yuxi XIAN Simeon AGATHOPOULOS CAS Key Laboratory of Materials for Energy Conversion Department of Materials Science and EngineeringUniversity of Science and Technology of ChinaHefei 230026China School of Materials Science and Engineering Henan Key Laboratory of Special Protective MaterialsLuoyang Institute of Science and TechnologyLuoyang 471023China Yangtze Delta Region Institute(Huzhou) University of Electronic Science and Technology of ChinaHuzhou 313001China School of Energy Science and Engineering University of Electronic Science and Technology of ChinaChengdu 611731China CAS Key Laboratory of Mechanical Behaviors and Design of Materials Department of Modern MechanicsUniversity of Science and Technology of ChinaHefei 230026China Department of Materials Science and Engineering University of IoanninaIoannina GR-45110Greece

Tungsten carbide(WC)-based materials are widely considered as the hydrogen evolution reaction(HER)process catalysts due to their“Pt-like”electronic structure.Nonetheless,traditional powder electrodes have a high cost,and display problems related to the process itself and the poor stability over operation time.This paper presented a self-supported asymmetric porous ceramic electrode with WO_(3-x)whiskers formed in situ on the walls of the finger-like holes and membrane surface,which was prepared by combining phase inversion tape-casting,pressureless sintering,and thermal treatment in a CO_(2) atmosphere.The optimized ceramic electrode displayed good catalytic HER activity and outstanding stability at high current densities.More specifically,it demonstrated the lowest overpotentials of 107 and 123 mV and the lowest Tafel slopes of 59.3 and 72.4 mV·dec^(-1)at 10 mA·cm^(-2)in acidic and alkaline media,respectively.This superior performance was ascribed to the structure of the ceramic membrane and the charge transfer efficiency,which was favored by the in situ developed WC/WO_(3-x)heterostructure and the oxygen vacancies.

关键词： hydrogen evolution reaction(HER) porous ceramic membrane WC/WO_(3−x)heterostructure self-supported electrode oxygen vacancies

Occurrence,evolution and degradation of heavy haze events in Beijing traced by iodine-127 and iodine-129 in aerosols

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Chinese Chemical Letters 2022年第7期33卷 3507-3515页

作者： Miao Fang xue Zhao Yixuan Liu Yang Shao Ning Chen Min Luo luyuan Zhang Qi Liu Lingling Ma Diandou xu Xiaolin Hou State Key Laboratory of Loess and Quaternary Geology Shaanxi Key Laboratory of Accelerator Mass Spectrometry Technology and ApplicationXi'an AMS CenterInstitute of Earth EnvironmentChinese Academy of SciencesXi'an 710061China Institute of High Energy Physics Chinese Academy of SciencesBeijing 100049China Department of Environmental Engineering Technical University of DenmarkRisøCampusRoskilde 4000Denmark Xi'an Institute for Innovative Earth Environment Research Xi'an 710061China CAS Center for Excellence in Quaternary Science and Global Change Xi'an 710061China Open Studio for Oceanic-Continental Climate and Environment Changes Pilot National Laboratory for Marine Science and Technology(Qingdao)Qiangdao 266061China University of Chinese Academy of Sciences Beijing 100049China

Heavy haze events have become a serious environment and health problem in China and many developing countries,especially in big cities,like Beijing.However,the factors and processes triggered the formation of secondary particles from the gaseous pollutants are still not clear,and the processes driving evolution and degradation of heavy haze events are not well understood.Iodine isotopes(127Ⅰand129Ⅰ)as tracers were analyzed in time series aerosol samples collected from Beijing.It was observed that the127Ⅰconcentrations in aerosols peaked during the heavy haze events.The conversion of gaseous iodine to particular iodine oxides through photochemical reactions provides primary nuclei in nucleation and formation of secondary air particles,which was strengthened as the external iodine input from the fossil fuel burning in the south/southeast industrial cities and consequentially induced heavy haze events.Anthropogenic ^(129)Ⅰconcentrations peaked during clean air conditions and showed high levels in spring and later autumn compared to that in summer.^(129)Ⅰoriginated from the direct air discharges and re-emissions from contaminated seawaters by the European nuclear fuel reprocessing plants was transported to Beijing by the interaction of Westerlies and East Asian winter monsoon.Three types of mechanisms were found in the formation and evolution of heavy haze events in Beijing by the variation of ^(127)Ⅰand ^(129)Ⅰ,i.e.,iodine oxides intermediated secondary air particles,dust storm and mixed mode by both secondary air particles and dust storm induced processes.

关键词： Haze Iodine isotopes Aerosol Primary nuclei Secondary air particles Formation mechanism of particles

Enhancing tylosin production by combinatorial overexpression of efflux,SAM biosynthesis,and regulatory genes in hyperproducing Streptomyces xinghaiensis strain

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Synthetic and Systems Biotechnology 2023年第3期8卷 486-497页

作者： Penghui Dai Yuyao Qin luyuan Li Haidi Li Lihuo Lv Danying xu Yuqing Song Tingting Huang Shuangjun Lin Zixin Deng Meifeng Tao State Key Laboratory of Microbial Metabolism School of Life Sciences and BiotechnologyShanghai Jiao Tong UniversityShanghai200240China Zhejiang Apeloa Biotechnology Co. Ltd.Jinhua322109China Zhejiang Apeloa Jiayuan Pharmaceutical Co. Ltd.Jinhua322118China Haihe Laboratory of Synthetic Biology Tianjin300308China

Tylosin is a 16-membered macrolide antibiotic widely used in veterinary medicine to control infections caused by Gram-positive pathogens and mycoplasmas.To improve the fermentation titer of tylosin in the hyperproducing Streptomyces xinghaiensis strain TL01,we sequenced its whole genome and identified the biosynthetic gene cluster therein.Overexpression of the tylosin efflux gene tlrC,the cluster-situated S-adenosyl methionine(SAM)synthetase gene metK_(cs),the SAM biosynthetic genes adoK_(cs)-metFcs,or the pathway-specific activator gene tylR enhanced tylosin production by 18%,12%,11%,and 11%in the respective engineered strains TLPH08-2,TLPH09,TLPH10,and TLPH12.Co-overexpression of metK_(cs)and adoK_(cs)-metFcs as two transcripts increased tylosin production by 22%in the resultant strain TLPH11 compared to that in TL01.Furthermore,combinational overexpression of tlrC,metK_(cs),adoK_(cs)-metFcs,and tylR as four transcripts increased tylosin production by 23%(10.93g/L)in the resultant strain TLPH17 compared to that in TL01.However,a negligible additive effect was displayed upon combinational overexpression in TLPH17 as suggested by the limited increment of fermentation titer compared to that in TLPH08-2.Transcription analyses indicated that the expression of tlrC and three SAM biosynthetic genes in TLPH17 was considerably lower than that of TLPH08-2 and TLPH11.Based on this observation,the five genes were rearranged into one or two operons to coordinate their overexpression,yielding two engineered strains TLPH23 and TLPH24,and leading to further enhancement of tylosin production over TLPH17.In particular,the production of TLPH23 reached 11.35 g/L.These findings indicated that the combinatorial strategy is a promising approach for enhancing tylosin production in high-yielding industrial strains.

关键词： Streptomyces xinghaiensis Tylosin Combinational metabolic engineering

Nonstationary probability densities of a class of nonlinear system excited by external colored noise

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Science China(Physics,Mechanics & Astronomy) 2012年第3期55卷 477-482页

作者： QI luyuan xu Wei GU xuDong Department of Applied Mathematics Northwestern Polytechnical UniversityXi’an 710129China Department of Engineering Mechanics Northwestern Polytechnical UniversityXi’an 710129China

This paper deals with the approximate nonstationary probability density of a class of nonlinear vibrating system excited by colored noise.First,the stochastic averaging method is adopted to obtain the averaged It equation for the amplitude of the system.The corresponding Fokker-Planck-Kolmogorov equation governing the evolutionary probability density function is deduced.Then,the approximate solution of the Fokker-Planck-Kolmogorov equation is derived by applying the Galerkin method.The solution is expressed as a sum of a series of expansion in terms of a set of proper basis functions with timedepended coefficients.Finally,an example is given to illustrate the proposed procedure.The validity of the proposed method is confirmed by Monte Carlo Simulation.

关键词：概率密度函数非线性系统非平稳有色噪声 Galerkin方法非线性振动系统随机平均法兴奋

Sepiolite/Cu_2O/Cu photocatalyst: Preparation and high performance for degradation of organic dye

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Journal of Materials Science & Technology 2019年第3期35卷 285-291页

作者： Peisan Wang Chunxia Qi luyuan Hao Pengchao Wen Xin xu Chinese Academy of Sciences Key Laboratory of Materials for Energy Conversion Department of Materials Science and Engineering University of Sciencend Technology of China Department of Chemistry Anhui Medical University Department of Chemical Engineering Hefei Normal University

A novel ternary sepiolite/Cu_2O/Cu(SCC) nanocomposite was successfully synthesized by a facile one-pot method. The Cu_2O/Cu nanoparticles in the SCC nanocomposite are well dispersed on the sepiolite surface. It exhibited enhanced photocatalytic performance in the degradation of congo red(CR), remarkably superior to that of Cu_2O or Cu_2O/Cu nanoparticles. Elemental copper in the SCC serves as a good electron acceptor to promote the transfer of photo-generated electrons in Cu_2O and suppress the recombination of the photo-generated electrons and holes of the composite. The enhanced photocatalytic efficiency is attributed to the synergistic effect of sepiolite and Cu_2O/Cu. This type of SCC nanocomposites is a promising candidate as photocatalytic material for environmental protection.

关键词： Sepiolite/Cu2O/Cu Nanocomposite Photocatalytic Organic dye

Music stimuli lead to increased levels of nitrite in unstimulated mixed saliva

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Science China(Life Sciences) 2018年第9期61卷 1099-1106页

作者： luyuan Jin Mengbi Zhang Junji xu Dengsheng Xia Chunmei Zhang Jingsong Wang Songlin Wang Salivary Gland Disease Center and Beijing Key Laboratory of Tooth Regeneration and Function Reconstruction Capital Medical University School of Stomatology Department of General Dentistry and Emergency Care Capital Medical University School of Stomatology Department of Biochemistry and Molecular Biology Capital Medical University School of Basic Medical Sciences

Concentration of salivary nitrate is approximately 10-fold to that of serum. Many circumstances such as acute stress could promote salivary nitrate secretion and nitrite formation. However, whether other conditions can also be used as regulators of salivary nitrate/nitrite has not yet been explored. The present study was designed to determine the influence of exposure to different music on the salivary flow rate and nitrate secretion and nitrite formation. Twenty-four undergraduate students(12 females and 12 males) were exposed to silence, rock music, classical music or white noise respectively on four consecutive mornings. The unstimulated salivary flow rate and stimulated salivary flow rate were measured. Salivary ionic(Na+, Ca2+Cl-,and PO3-4) content and nitrate/nitrite levels were detected. The unstimulated salivary flow rate was significantly increased after classical music exposure compared to that after silence. Salivary nitrite levels were significantly higher upon classical music and white noise stimulation than those under silence in females. However, males were more sensitive only to white noise with regard to the nitrite increase. In conclusion, this study demonstrated that classical music stimulation promotes salivary nitrite formation and an increase in saliva volume was observed. These observations may play an important role in regulating oral function.

关键词：亚硝酸根古典音乐水体积混合硝酸盐流动率白噪音分泌物