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Solving Combinatorial Optimization Problems with Deep Neural Network:A Survey

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Tsinghua Science and Technology 2024年第5期29卷 1266-1282页

作者： Feng Wang qi he Shicheng Li School of Computer Science Wuhan UniversityWuhan 430072China

Combinatorial Optimization Problems(COPs)are a class of optimization problems that are commonly encountered in industrial production and everyday *** the last few decades,traditional algorithms,such as exact algorithms,approximate algorithms,and heuristic algorithms,have been proposed to solve ***,as COPs in the real world become more complex,traditional algorithms struggle to generate optimal solutions in a limited amount of *** Deep Neural Networks(DNNs)are not heavily dependent on expert knowledge and are adequately flexible for generalization to various COPs,several DNN-based algorithms have been proposed in the last ten years for solving ***,we categorize these algorithms into four classes and provide a brief overview of their applications in real-world problems.

关键词： Combinatorial Optimization Problem(COPs) pointer network Transformer Graph Neural Network(GNN) Reinforcement Learning(RL)

High-Order Two-Scale Asymptotic Paradigm for the Elastodynamic Homogenization of Periodic Composites

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Acta Mechanica Solida Sinica 2024年第1期37卷 124-138页

作者： Wei-Zhi Luo Mu he Liang Xia qi-Chang he State Key Laboratory of Intelligent Manufacturing Equipment and Technology Huazhong University of Science and TechnologyWuhan 430074China Laboratoire Modélisation et Simulation Multi-Echelle MSME UMR 8208 CNRSUniversite Gustave Eiffel77454 Marne-la-ValléeFrance

The classical two-scale asymptotic paradigm provides macroscopic and microscopic analyses for the elastodynamic homogenization of periodic composites based on the spatial or/and temporal variable,which offers an approximate framework for the asymptotic homogenization analysis of the motion ***,in this framework,the growing complexity of the homogenization formulation gradually becomes an obstacle as the asymptotic order *** such a context,a compact,fast,and accurate asymptotic paradigm is *** work reviews the high-order spatial two-scale asymptotic paradigm with the effective displacement field representation and optimizes the implementation by symmetrizing the tensor to be ***,the modified implementation gets rid of the excessive memory consumption required for computing the high-order tensor,which is demonstrated by representative one-and two-dimensional *** numerical results show that(1)the contrast of the material parameters between media in composites directly affects the convergence rate of the asymptotic results for the homogenization of periodic composites,(2)the convergence error of the asymptotic results mainly comes from the truncation error of the modified asymptotic homogenized motion equation,and(3)the excessive norm of the normalized wavenumber vector in the two-dimensional inclusion case may lead to a non-convergence of the asymptotic results.

关键词： Composites Homogenization Asymptotic analysis Dynamics Dispersion

Application of magnetic solid phase extraction in separation and enrichment of glycoproteins and glycopeptides

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Chinese Chemical Letters 2021年第9期32卷 2629-2636页

作者： he qi Liyan Jiang qiong Jia College of Chemistry Jilin UniversityChangchun 130012China Key Laboratory for Molecular Enzymology and Engineering of Ministry of Education School of Life SciencesJilin UniversityChangchun 130012China

The analysis of endogenous glycoproteins and glycopeptides in human body fluids is of great importance for screening and discovering disease biomarkers with clinical ***,the presence of interfering substances makes the direct quantitative detection of low-abundance glycoproteins and glycopeptides in human body fluids one of the great challenges in analytical *** solid phase extraction(MSPE)has the advantages of easy preparation,low cost and good magnetic *** adsorbents are the core of MSPE technology,and magnetic adsorbents based on different functional materials are widely used in the quantitative analysis of glycoproteins and glycopeptides in human body fluids,making it possible to analyze glycoproteins and glycopeptides with low abundance as well as multiple types,which provides a technical platform for screening and evaluating glycoproteins and glycopeptides in body fluids as disease *** this paper,we focus on the recent advances in the application of MSPE technology and magnetic adsorbents for the separation and enrichment of glycoproteins and glycopeptides in human body fluids,and the future trends and application prospects in this field are also presented.

关键词： Glycoproteins Glycopeptides Magnetic solid phase extraction(MSPE) Separation Enrichment Human body fluids

QUALITY CONTROL OF SEMICONDUCTOR PACKAGING BASED ON PRINCIPAL COMPONENTS ANALYSIS

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Chinese Journal of Mechanical Engineering 2007年第6期20卷 84-86页

作者： he Shuguang qi Ershi he Zhen NIE Bin School of Management Tianjin University Tianjin 300072 China

5 critical quality characteristics must be controlled in the surface mount and wire-bond process in semiconductor packaging. And these characteristics are correlated with each other. So the principal components analysis（PCA） is used in the analysis of the sample data firstly. And then the process is controlled with hotelling T^2 control chart for the first several principal components which contain sufficient information. Furthermore, a software tool is developed for this kind of problems. And with sample data from a surface mounting device（SMD） process, it is demonstrated that the T^2 control chart with PCA gets the same conclusion as without PCA, but the problem is transformed from high-dimensional one to a lower dimensional one, i.e., from 5 to 2 in this demonstration.

关键词： Semiconductor packaging Principal components analysis Quality control

Villain or Tragic hero?——The Ambiguous Characterization of Bosola

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外语教学 1989年第1期10卷 16-26,55页

作者： he qi-Xin

在韦伯斯特的著名悲剧《马尔菲公爵夫人》中最引人注目的角色是鲍瑟勒。虽然历代戏剧评论家对于这个人物褒贬不一,但是当分析鲍瑟勒在剧中的作用时,他们往往给他贴上一个标签,认为他属于某一种特定的悲剧人物。通过分析鲍瑟勒在剧中的... 详细信息

在韦伯斯特的著名悲剧《马尔菲公爵夫人》中最引人注目的角色是鲍瑟勒。虽然历代戏剧评论家对于这个人物褒贬不一,但是当分析鲍瑟勒在剧中的作用时,他们往往给他贴上一个标签,认为他属于某一种特定的悲剧人物。通过分析鲍瑟勒在剧中的一言一行,本文认为韦伯斯特在塑造这个人物时有意避免遵循传统悲剧人物的模式。在剧中,鲍瑟勒既是一个受人雇用专搞谋杀的恶棍,又是一个复仇者;既是一个解说员、一个暗探、一个刽子手,又是上帝的惩罚之神。在他的身上我们可以看到正反两个方面的品质。而鲍瑟勒在思想上和心理上的多重性正是这个角色的魅力。为了解开这个人物塑造之谜,我们需要一而再、再而三地细读原剧,而这很可能就是韦伯斯特塑造这个人物的真实意图。

关键词：悲剧人物戏剧评论传统悲剧角色人物塑造刽子手多重性标签褒贬真实意图

Optimization of elastolysis conditions and elastolytic kinetic analysis with elastase from Bacillus licheniformis ZJUEL31410

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Journal of Zhejiang University-Science B(Biomedicine & Biotechnology) 2006年第6期7卷 482-490页

作者： CheN qi-he he Guo-qing Department of Food Science and Nutrition Zhejiang University Hangzhou 310029 China

The solubilization of elastin by Bacillus licheniformis elastase cannot be analyzed by conventional kinetic methods because the biologically relevant substrate is insoluble and the concentration of enzyme-substrate complex has no physical meaning. In this paper we report the optimization of elastolysis conditions and analysis of elastolytic kinetics. Our results indicated that the hydrolyzing temperature and time are very important factors affecting elastolysis rate. The optimized conditions using central composite design were as follows： elastolysis temperature 50 ℃, elastase concentration 1 × 10^4 U/ml, elastin 80 mg, elastolytic time 4 h. Investigation of the effects of substrate content, elastase concentration and pH was also revealed that low or high elastin content inhibits the elastolysis process. Increasingelastase improves elastin degradation, but high elastase may change the kinetics characterization. Alkaline environment can decrease elastin degradation rate and pH may affect elastolysis by changing elastase reaction pH. To further elucidate the elastolysis process, the logistic model was used to elastolysis kinetics study showing clearly that the logistic model can reasonably explain the elastolysis process, especially under lower elastase concentration. However, there is still need for more investigations with the aid of other methods, such as biochemical and molecular methods.

关键词： Bacillus licheniformis Elastase Elastolysis condition optimization Elastolytic kinetics

A general solution for Stokes flow and its application to the problem of a rigid plate translating in a fluid

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Acta Mechanica Sinica 2015年第1期31卷 32-44页

作者： Xiang-Yu Li Si-Cong Ren qi-Chang he School of Mechanics and Engineering Southwest Jiaotong University School of Mechanical Engineering Southwest Jiaotong University Universit'e Paris-Est Laboratoire Mod'elisation et Simulation Multi Echelle UMR 8208 CNRS 5 Boulevard Descartes77454 Marne-la-Vall'ee France

A general solution for 3D Stokes flow is given which is different from, and more compact than the exist ing ones and more compact than them in that it involves only two scalar harmonic functions. The general solution deduced is combined with the potential theory method to study the Stokes flow induced by a rigid plate of arbitrary shape trans lating along the direction normal to it in an unbounded fluid. The boundary integral equation governing this problem is derived. When the plate is elliptic, exact analytical results are obtained not only for the drag force but also for the ve locity distributions. These results include and complete the ones available for a circular plate. Numerical examples are provided to illustrate the main results for circular and ellip tic plates. In particular, the elliptic eccentricity of a plate is shown to exhibit significant influences.

关键词： Stokes flow 3D general solutions Potentialtheory method Circular plate Elliptic plate

Shadow obstacle model for realistic corner-turning behavior in crowd simulation

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Frontiers of Information Technology & Electronic Engineering 2016年第3期17卷 200-211页

作者： Gao-qi he Yi JIN qi CheN Zhen LIU Wen-hui YUE Xing-jian LU Department of Computer Science and Engineering East China University of Science and Technology Shanghai 200237 China MOE Key Laboratory of Geographic Information Science East China Normal University Shanghai 200241 China State Key Laboratory of Virtual Reality Technology and Systems Beihang University Beijing 100191 China College of Information Science and Technology Ningbo University Ningbo 315211 China

This paper describes a novel model known as the shadow obstacle model to generate a realistic comer-tuming behavior in crowd simulation. The motivation for this model comes from the observation that people tend to choose a safer route rather than a shorter one when turning a comer. To calculate a safer route, an optimization method is proposed to generate the corner-turning rule that maximizes the viewing range for the agents. By combining psychological and physical forces together, a full crowd simulation framework is established to provide a more realistic crowd simulation. We demonstrate that our model produces a more realistic comer-turning behavior by comparison with real data obtained from the experiments. Finally, we per- form parameter analysis to show the believability of our model through a series of experiments.

关键词： Comer-turning behavior Crowd simulation Safety awareness Rule-based model

Laser Double Ablation Reactions of Chromium(Iron)and Sulfur Clusters

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Chemical Research in Chinese Universities 2001年第4期17卷 473-476页

作者： LIU Peng ZHANG Xia GAO Zhen ZHU qi-he State Key Laboratory of Molecular Reaction Dynamics Center of Molecular ScienceInstitute of ChemistryChinese Academy of SciencesBeijing 100080P.R.China

The sulfides of transitional metals chromium[1-3] and iron[4] are of great importance inmaterial and biology sciences due to their characteristic structures and *** the studyon the properties of Cr－S and Fe－S cluste... 详细信息

关键词： Cluster Laser double ablation reaction Formation mechanism Stable configuration