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Simulation of lattice orientation effects on void growth and coalescence by crystal plasticity

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Acta Metallurgica Sinica(English Letters) 2009年第1期22卷 40-50页

作者： Mei yang Xianghuai dong Department of Plastic Forming Shanghai Jiaotong University Shanghai 200030 China

A three dimensional rate-dependent crystal plasticity model is applied to study the influence of crystal orientation and grain boundary on the void growth and coalescence. The 3D computational model is a unit cell including one sphere void or two sphere voids. The results of three different orientations for single crystal and bicrystals are compared. It is found that crystallographic orientation has noticeable influences on the void growth directionvoid shape, and void coalescence of single crystal. The void growth rate of bicrystals depends on the crystallographic orientations and grain boundary direction.

关键词： Crystal plasticity Void growth Void coalescence Lattice orientation Bicrystal

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混合博弈问题的求解与应用综述

软件学报 2025年第1期36卷 107-151页

作者：董绍康李超杨光葛振兴曹宏业陈武兵杨尚东陈兴国李文斌高阳计算机软件新技术国家重点实验室(南京大学) 南京邮电大学计算机学院软件学院网络空间安全学院

近年来,随着人工智能技术在序贯决策和博弈对抗等问题的应用方面取得了飞速发展,围棋、游戏、德扑和麻将等领域取得了巨大的进步,例如, AlphaGo、OpenAI Five、AlphaStar、DeepStack、Libratus、Pluribus和Suphx等系统都在这些领域中达... 详细信息

近年来,随着人工智能技术在序贯决策和博弈对抗等问题的应用方面取得了飞速发展,围棋、游戏、德扑和麻将等领域取得了巨大的进步,例如, AlphaGo、OpenAI Five、AlphaStar、DeepStack、Libratus、Pluribus和Suphx等系统都在这些领域中达到或超过人类专家水平.这些应用集中在双人、两队或者多人的零和博弈问题中,而对于混合博弈问题的研究缺乏实质性的进展与突破.区别于零和博弈,混合博弈需要综合考虑个体收益、集体收益和均衡收益等诸多目标,被广泛应用于公共资源分配、任务调度和自动驾驶等现实场景.因此,对于混合博弈问题的研究至关重要.通过梳理当前混合博弈领域中的重要概念和相关工作,深入分析国内外研究现状和未来发展方向.具体地,首先介绍混合博弈问题的定义与分类;其次详细阐述博弈解概念和求解目标,包含纳什均衡、相关均衡、帕累托最优等解概念,最大化个体收益、最大化集体收益以及兼顾公平等求解目标;接下来根据不同的求解目标,分别对博弈论方法、强化学习方法以及这两种方法的结合进行详细探讨和分析;最后介绍相关的应用场景和实验仿真环境,并对未来研究的方向进行总结与展望.

关键词：混合博弈博弈论强化学习

Nonlinear analysis of photo-induced wrinkling of glassy twist nematic films on compliant substrates

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Acta Mechanica Sinica 2015年第5期31卷 672-678页

作者： dong yang Ling-Hui He CAS Key Laboratory of Mechanical Behavior and Design of Materials University of Science and Technology of China

A kinetics approach is developed for the geometrically nonlinear analysis of photo-induced wrinkling of glassy twist nematic films on soft elastic *** this way,the problem is reduced to finding the steady state of an overdamped evolution system according to a kinetic law,rather than directly solving the coupled nonlinear *** enables one to account for the complicated director distribution and obtain the precise wrinkling morphology of the *** the approach proposed here is for a twist nematic film,it can be extended to study glassy nematic films with other director distributions.

关键词： Glassy nematic film Wrinkling pattern Nonlinear analysis

Quantitative Characterizations of Bounded Compact Approximation Property by Semi-Fredholm Operators

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Acta Mathematica Sinica,English Series 2023年第6期39卷 1115-1128页

作者： dong yang CHEN Ying Bin RUAN School of Mathematical Sciences Xiamen UniversityXiamen 361005P.R.China School of Mathematics and Statistics Fujian Normal UniversityFuzhou 350007P.R.China

Based on a characterization of upper semi-Fredholm operators due to *** and ***,we introduce and investigate a new quantity characterizing upper semi-Fredholm *** quantity and several well-known quantities are used to characterize bounded compact approximation ***,a new quantity characterizing lower semi-Fredholm operators is introduced,investigated and used to characterize the bounded compact approximation property for dual spaces.

关键词： Bounded compact approximation property compact operators upper semi-Fredholm operators lower semi-Fredholm operators

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Bumpless transfer fault detection for switched systems: a state-dependent switching approach

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Science China(Information Sciences) 2021年第7期64卷 117-131页

作者： Guangdeng ZONG Chunxiao HUANG dong yang School of Engineering Qufu Normal University

This paper focuses on the bumpless transfer fault detection problem for switched systems under state-dependent switching. The goal is to find an effective constraint on filters and an appropriate switching signal to reduce the bumps of residual signals caused by switching while achieving expected fault sensitivity and robustness of the filtering systems. For transient behavior description, a novel bumpless transfer constraint is proposed to limit the amplitude of residual signals into a bounded range at the switching points. In terms of multiple Lyapunov functions, a state-dependent switching law is designed to realize fault detection performance even if the robustness and fault sensitivity of each subsystem are local. Sufficient conditions for the bumpless transfer fault detection problem are provided in the form of linear matrix inequalities. Finally,a numerical example is given to validate the effectiveness of the developed method.

关键词： bumpless transfer fault detection multiple Lyapunov functions state-dependent switching law switched systems

A New Mach-Zehnder Interferometer to Measure Light Beam Dispersion and Phase Shift

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Chinese Physics Letters 2013年第4期30卷 38-40页

作者： yang Xu-dong School of Applied Science Taiyuan University of Science and TechnologyTaiyuan 030024

A novel Mach–Zehnder(M-Z)interferometer used to measure the dispersion and phase shift of a light beam is *** interferometer consists of two identical beam displacing polarizers,which makes two beams of interference light pass through the same optical device and greatly improves the stability of the M-Z *** basic method of dispersion and phase measuring through the present interferometer is introduced in detail,and the actual application is demonstrated by a specific *** the measuring of dispersion and phase shift is the heating point in the field of optics,it is obvious that the M-Z interferometer will have important applications in aspects of optics,especially quantum optics and optical information processing.

关键词： interferometer optical optics

Comparison on End-of-Life strategies of WEEE in China based on LCA

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Frontiers of Environmental Science & Engineering 2017年第5期11卷 85-96页

作者： Bin Lu Xiaolong Song Jianxin yang dong yang State Key Laboratory of Urban and Regional Ecology Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Beijing 100085 China Shanghai Collaborative Innovation Centre tbr WEEE Recycling Shanghai Polytechnic University Shanghai 201209 China SDAS Key Laboratory of Scientific Decision-Making Institute of Science and Technology for Develooment of Shandong Shandong Province Academy of Sciences Jinan 250014 China

As the Electrical and Electronic Equipment （EEE） are upgraded more frequently in China, a large quantity of Waste Electrical and Electronic Equipment （WEEE） was and will be generated. It becomes an urgent issue to develop and adopt an effective End-of-Life （EoL） strategy for EEE in order to balance the resource recovery and environmental impacts. In an EoL strategy hierarchy for EEE, reuse strategy is usually deemed to be prior to materials recovery and other strategies. But in practice, the advantages and disadvantages of different strategies are always context-dependent. Therefore, main EoL strategies for EEE in China need to be evaluated in environment and resources aspects from the life cycle perspective. In this study, the obsolete refrigerator and Power Supply Unit （PSU） ofdesktop PC are both taken as the target products. Life Cycle Assessment （LCA） is applied to assess the environmental impacts of different EoL scenarios in China： Unit Reuse Scenario （URS）, Component Reuse Scenario （CRS） and Materials Recovery Scenario （MRS）. The LCA results show that the EoL strategies hierarchy is reasonable for the part＇of computer, bui not necessarily suitable for obsolete refrigerators. When the policy makers promote or demote one EoL strategy especially reuse, it is necessary to take subsequent impacts into consideration.

关键词： End-of-Life Waste Electrical and Electronic Equipment Life Cycle Assessment Reuse

The calculation of the circulation in South China Sea by a diagnostic model

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Acta Oceanologica Sinica 2008年第z1期27卷 31-45页

作者： ZHOU Weidong yang yang dong Danpeng South China Sea Institute of Oceanology Chinese Academy of Science Guangzhou 510301 China South China Sea Institute of Oceanology Chinese Academy of Science Guangzhou 510301 China South China Sea Institute of Oceanology Chinese Academy of Science Guangzhou 510301 China

A high resolved two-dimensional linear global diagnostic model combining with the dynamical calculation is used to calculate velocity field in the South China Sea(SCS). The study of model results shows that eddy diffusion does not change basic structure of circulation in the SCS and does not change the direction of invasive water, but changes the value of transport considerably especially in straits. The velocity field is not changed whether the wind stress is considered or not. This result shows the circulation is largely determined by a density field which well records most of the important contribution of the wind stress effect. Potential vorticity is calculated to testify the dynamics of the model results. The result shows that a good conservation of the nonlinear PV. This indicates most effects of the important nonlinear processes are well recorded in density and the nonlinear term is negligible so that the simplified model is reliable. The model results show the water exchanges between the SCS and open ocean or surrounding seas. Cold deep water invades through Luzon Strait and Warm shallow water is pushed out mainly through Karimata Straits. The model results also reveal the structure of the circulation in the SCS basin. In two circulations of upper and middle layers, a cyclonic one in the north and an anti-cyclonic one in the south, reflect the climatologic average of the circulation driven by monsoon. In the deep or bottom layer, these two circulations reflect the topography of the basin. Above the middle layer, invasive water enters westward in the north but the way of invasion of Kuroshio is not clear. Below the deep layer, a current goes down south near the east basin ,and invasive water enters in the basin from the west Pacific.

关键词： diagnostic model South China Sea potential vorticity circulation

Interference cancellation method based on space-time code for MIMO interference channel

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The Journal of China Universities of Posts and Telecommunications 2016年第3期23卷 45-50页

作者： yang dong Tian Xinji Opening Project of Key Laboratory of Mine Informatization Henan Polytechnic University School of Computer Science and Technology Henan Polytechnic University

We investigate how to cancel interference by using space time code and codeword space alignment for multiple-input multiple-output （MIMO） Y channel consisting of three users and a relay. All the nodes adopt Alamouti code. During the multiple access （MA） stage, two codewords within each reciprocal codeword pair are aligned through pre-coding. The relay decodes the elements of each codeword pair using the orthogonal property of effective channel matrix of Alamouti codeword. During the broadcast （BC） stage, the interference between codeword pairs at each user is eliminated by the orthogonal property of effective channel matrix of Alamouti codeword, instead of the interference alignment （IA） pre-coding. Thus, channel state information （CSI） is not required during the BC stage, which greatly reduce the amount of feedback.

关键词： MIMO Y channel space-time code space alignment feedback amount