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Nash equilibrium seeking with prescribed performance

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Control Theory and Technology 2023年第3期21卷 437-447页

作者： chao sun Guoqiang Hu Continental-NTU Corporate Lab Nanyang Technological University639798 NanyangSingapore School of Electrical and Electronic Engineering Nanyang Technological University639798 NanyangSingapore

In this work,we study a Nash equilibrium(NE)seeking problem for strongly monotone non-cooperative games with prescribed *** general NE seeking algorithms,the proposed prescribed-performance NE seeking laws ensure that the convergence error evolves within a predefined ***,the settling time,convergence rate,and maximum overshoot of the algorithm can be ***,we develop a second-order Newton-like algorithm that can guarantee prescribed performance and asymptotically converge to the NE of the ***,we develop a first-order gradient-based *** remove some restrictions on this first-order algorithm,we propose two discontinuous dynamical system-based algorithms using tools from non-smooth analysis and adaptive *** study the special case in optimization ***,we investigate the robustness of the *** can be proven that the proposed algorithms can guarantee asymptotic convergence to the Nash equilibrium with prescribed performance in the presence of bounded ***,we consider a second-order dynamical system *** simulation results verify the effectiveness and efficiency of the algorithms,in terms of their convergence rate and disturbance rejection ability.

关键词： Nash equilibrium seeking Non-cooperative games Prescribed performance Disturbance rejection

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基于KNN-SVM的混合气体检测方法研究

光谱学与光谱分析 2025年第1期45卷 117-124页

作者：孙超胡润泽吴中旭刘年松丁建军江汉大学智能制造学院湖北武汉430056 精细爆破国家重点实验室湖北武汉430056

当今混合气体检测的研究中,针对多组分气体数据进行分类预测的数学算法百花齐放,如何快速且准确的检测出气体的成分和浓度逐渐成为当今研究的热门。然而在一些研究中,气体数据特征难以捕捉和判断,泛化能力不足,对气体数据进行分类预测... 详细信息

当今混合气体检测的研究中,针对多组分气体数据进行分类预测的数学算法百花齐放,如何快速且准确的检测出气体的成分和浓度逐渐成为当今研究的热门。然而在一些研究中,气体数据特征难以捕捉和判断,泛化能力不足,对气体数据进行分类预测的精度和效率表现较差。为此,针对一些数据偏差和泛化误差无界的问题,提出了一种K最近邻-支持向量机(KNN-SVM)算法,对一些难以作出分类的模糊气体数据进行二次分类,采用KNN和SVM两种算法共同抉择,更加全面的捕捉数据特征,根据实验确定各自算法的权重比从而提高判别气体类别的准确率,两种算法的集成也能提高算法的效率,对于不同种类的气体也能有良好的适应性的稳定性。该实验气体组分由12 mg·L^(-1)的C_(2)H_(2)、NO_(2)、SF_(6),10 mg·L^(-1)的NO_(2)、SF_(6)和5 mg·L^(-1)的C_(2)H_(2)(背景气体皆为N_(2))以及两瓶纯N_(2)的气瓶组成;通过互相混合和与N_(2)配比制备出实验设定的气体浓度。实验过程通过单一气体的检测可分别对三种气体获得60组训练集,并通过这60组数据可进行线性拟合得到每种气体的拟合线,得到气体浓度与气体吸收峰值的关系,通过实验检测得到的三种气体拟合线,其中C_(2)H_(2)拟合线的调整后R^(2)为0.991,NO_(2)拟合线的调整后R^(2)为0.981,SF_(6)拟合线的调整后R^(2)为0.987,可得气体检测的准确性。再通过互相混合进行检测可分别获得40组训练集,采用KNN-SVM算法对混合气体进行分类和预测,后通过拟合线即可反演出混合气体中每种气体的浓度。将该算法与传统SVM算法进行各种分类指标对比均可显示出该算法的有效性和优越性。实验结果表明,KNN-SVM算法在气体分类预测方面表现出卓越的性能,准确率高达99.167%,AUC(area under curve)值达99.375%。这一算法不仅提高了气体检测的准确性,还增强了泛化能力可适应多样化的气体组分,为实时气体检测系统提供了有力支持。

关键词：光声光谱气体检测 KNN-SVM 分类预测

Ion acceleration at dipolarization fronts associated with the interchange instability in Earth's magnetotail

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Science China(Technological Sciences) 2020年第11期63卷 2375-2383页

作者： LU HaoYu GE YaSong sun chao School of Space and Environment Beihang UniversityBeijing 100191China Institute of Geology and Geophysics Chinese Academy of SciencesBeijing 100029China

It has been confirmed that dipolarization fronts(DFs)are the result of the interchange instability in the Earth's *** this paper,we use a Hall MHD model to simulate the evolution of the interchange instability that produces DFs along the leading edge.A test particle simulation is performed to study the physical phenomenon of ion acceleration at the *** numerical simulation indicates that almost all particles move earthward and dawnward and then drift to the *** DF-reflected ion population at the duskside appears earlier as a consequence of the asymmetric Hall electric *** that are distributed in a dawn-dusk asymmetric semicircle behind the DF tend to be accelerated to higher energies(>13.5 keV).These high-energy particles eventually concentrate in the *** experience effective acceleration by the dawnward electric field,while they drift through the dawn flank at the front,toward the tail.

关键词： dipolarization fronts interchange instability ion acceleration Hall MHD simulation

Theoretical Insights into Intermolecular Hydrogen-Bonding Strengthening in Fluorenone-Methanol Complexes Induced by Electronic Excitation and Bulk Solvent Effect

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Chinese Journal of Chemical Physics 2013年第6期26卷 617-626,I0003页

作者： chao sun State Key Laboratory of Physical Chemistry of Solid Surfaces Fujian Provincial Key Laboratory of Theoretical and Computational Chemistry and Department of Chemistry College of Chemistry and Chemical Engineering Xiamen University Xiamen 361005 China Hefei National Laboratory for Physical Sciences at Microscale University of Science and Technology of China Hefei 230026 China

This work presents a theoretical insight into the variation of the site-specific intermolecular hydrogen-bonding （HB）, formed between C=O group of fluorenone （FN） and O-H groups of methanol （MeOL） molecules, induced by both the electronic excitation and the bulk solvent effect. Through the calculation of molecular ground- and excited-state properties, we not only demonstrate the characters of HB strengthening induced by electronic excitation and the bulk solvent effect but also reveal the underlying physical mechanism which leads to the HB variation. The strengthening of the intermolecular HB in electronically excited states and in liquid solution is characterized by the reduced HB bond-lengths and the red-shift IR spectra accompanied by the increasing intensities of IR absorption corresponding to the characteristic vibrational modes of the O-H and C--O stretching. The HB strengthening in the excited electronic states and in solution mainly arises from the charge redistribution of the FN molecule induced by the electronic excitation and bulk solvent instead of the intermolecular charge transfer. The charge redistribution of the solute molecule increases the partial dipole moment of FN molecule and the FN-MeOL intermolecular interaction, which subsequently leads to the HB strengthening. With the bulk solvent effect getting involved, the theoretical IR spectra of HBed FN-MeOL complexes agree much better with the experiments than those of gas-phase FN-MeOL dimer. All the calculations are carried out based on our developed analytical approaches for the first and second energy derivatives of excited electronic state within the time-dependent density functional theory.

关键词： Time-dependent density functional theory Excited-state property Hydrogen bond Intermolecular interaction

Crystallinity and stability of covalent organic frameworks

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Science China Chemistry 2020年第10期63卷 1367-1390页

作者： Xin Huang chao sun Xiao Feng Beijing Key Laboratory of Photoelectronic/Electrophotonic Conversion Materials Key Laboratory of Cluster ScienceMinistry of EducationSchool of Chemistry and Chemical EngineeringBeijing Institute of TechnologyBeijing 100081China

Covalent organic frameworks(COFs)are a class of organic porous polymers with high crystallinity,and their structures can be precisely tailored via topology *** to the characteristics of permanent pores,periodic structures and rich building blocks,COFs have triggered tremendous attention in the past fifteen years and are extensively investigated in various *** and stability are two crucial features for practical *** general,these two features are contradictory for COFs formed via dynamic covalent chemistry(DCC).High thermodynamic reversibility is usually required to attain exceptional crystallinity of COFs,often resulting in limited *** first two reported COFs are based on the boroxine and boronate ester linkages,which are unstable in water and even in humid ***,many researchers doubt the stability of COFs for real ***,in these years,various novel linkages have been developed for the construction of COFs,and numerous newly synthesized COFs are robust towards strong acid/base and even some of them can resist the attack of strong oxidizing and reducing *** this review,we focus on the linkage chemistry of the COFs in terms of crystallinity and stability,further extending it to the investigation in the mechanisms of the crystal growth and the overall regulation of the contradiction between stability and *** strategies for improving the crystallinity,including selecting building units,introducing non-covalent interactions and slowing nucleation and growth rate,are described in the third section,while the methodologies for increasing the stability from the viewpoints of chemical modification and non-covalent interactions are summarized in the fourth ***,the challenges and perspectives are presented.

关键词： covalent organic frameworks crystallinity stability dynamic covalent chemistry linkage chemistry

Evolution of Microstructures of a Low Carbon Bainitic Steel Held at High Service Temperature

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Acta Metallurgica Sinica(English Letters) 2014年第3期27卷 436-443页

作者： chao sun Shanwu Yang Guoliang Liu School of Materials Science and Engineering University of Science and Technology Beijing

Low carbon bainitic steel derives the high strength mainly from high density of dislocations rather than carbon and alloy element content, so it tends to evolve into equilibrium microstructure with low density of dislocations under thermal disturbance. In the present investigation, granular bainite and lath-like bainitic ferrite were produced respectively in Mo-free low-carbon steels by changing cooling rate;. It has been found that granular bainite possesses a lower strength at room temperature than bainitic ferrite, but it exhibits a slower decrease of strength with temperature increasing. Dislocation density in both granular bainite and bainitic ferrite decreases via recovery and recrystallization at high temperature. However, when reheating of bainite is carded out at temperature below 600 ℃, a long time will be needed for incubation of recrystallization, during which the hardness of bainite maintains stable. The property makes bainite, especially granular bainite, become a potential microstructure for matrix of high strength fire-resistant steel.

关键词： Low carbon bainitic steel High temperature strength Microstructure evolution Recrystallization Bainite

Coordinated Bayesian optimal approach for the integrated decision between electronic countermeasure and firepower attack

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Journal of Systems Engineering and Electronics 2010年第3期21卷 449-454页

作者： Zheng Tang Xiaoguang Gao chao sun School of Marine Engineering Northwestern Polytechnical University Xi'an 710072 R R. China School of Electronics and Information Northwestern Polytechnical University Xi'an 710129 P. R. China

The coordinated Bayesian optimization algorithm（CBOA） is proposed according to the characteristics of the function independence,conformity and supplementary between the electronic countermeasure（ECM） and the firepower attack *** selection criteria are combinations of probabilities of individual fitness and coordinated degree and can select choiceness individual to construct Bayesian network that manifest population evolution by producing the new *** the CBOA cannot only guarantee the effective pattern coordinated decision-making mechanism between the populations,but also maintain the population multiplicity,and enhance the algorithm *** simulation result confirms the algorithm validity.

关键词： electronic countermeasure firepower attack coordinated Bayesian optimization algorithm(CBOA).

Co-based Amorphous/Nanocrystalline Composite Coatings Deposited by Arc Ion Plating

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Journal of Materials Science & Technology 2013年第9期29卷 806-812页

作者： Zhengkai Chang Jun Gong chao sun State Key Laboratory for Corrosion and Protection Institute of Metal ResearchChinese Academy of Sciences

Cobalt-based amorphous/nanocrystalline composite coatings have been grown by arc ion plating together with a specimen cooling system. With decreasing substrate temperature, the coatings undergo significant structure evolution. The degree of crystallization first decreases and subsequently increases as confirmed by X-ray diffraction. The cluster size first decreases and then remains constant as confirmed by transmission electron microscopy. The effect of substrate temperature on the evolution of the structure has been studied as a result of a competition between nucleation thermodynamics and kinetics of crystalline growth. With decreasing the substrate temperature, the microhardness and the critical load of the composite coatings firstly increased, and then remained almost constant. And the saturation magnetization revealed the opposite trend over the same range. The essence of these phenomena was ascribed to the microstructural variations caused by the decrease of the substrate temperature.

关键词： Amorphous/nanocrystalline composite coatings Arc ion plating Thermodynamics Kinetics Microhardness Critical load

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论民初主流小说家的百年命运

复旦学报（社会科学版） 2017年第3期59卷 95-103页

作者：孙超上海政法学院文学与传媒学院上海201701

百年来,主倡"兴味"的民初主流小说家曾遭遇过双重历史遮蔽和一次错位误读。"五四"前后,新文学家将其斥为"旧派"、"鸳鸯蝴蝶派"、"礼拜六派"、"黑幕派"。在"新文学"正典化后,后来又一次对其发动攻讦,并将其与张恨水为代表的所谓"新礼拜六... 详细信息

百年来,主倡"兴味"的民初主流小说家曾遭遇过双重历史遮蔽和一次错位误读。"五四"前后,新文学家将其斥为"旧派"、"鸳鸯蝴蝶派"、"礼拜六派"、"黑幕派"。在"新文学"正典化后,后来又一次对其发动攻讦,并将其与张恨水为代表的所谓"新礼拜六派"混为一谈。新中国成立后的头三十年,各高校文学史均视其为"小说逆流",形成另一重彻底的抹杀性遮蔽。新时期以来,学界基本上将其纳入"近现代通俗文学史"视域进行考察,称其为"通俗小说家",名实不符地将其与前后的文学流派视为一体,形成一次错位误读。梳理并反思以上遮蔽与误读,不仅有助于早日还原民初主流小说家的历史本相,亦可为当下形成健康的文学批评之风提供借镜。

关键词：民初主流小说家百年遭遇鸳鸯蝴蝶派遮蔽误读