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基于相场法的混凝土梁断裂性能数值分析

建模与仿真 2024年第5期13卷 5459-5466页

作者：赵启迪李义磊上海理工大学环境与建筑学院上海

混凝土结构作为目前最主要的结构形式之一,其因荷载、环境等因素导致的断裂行为是不可忽视的。鉴于目前对多跨度混凝土梁研究较少,本文将基于相场法对多跨度的混凝土三点弯曲梁断裂性能进行模拟,旨在分析其断裂裂纹扩展及力学响应。首先... 详细信息

混凝土结构作为目前最主要的结构形式之一,其因荷载、环境等因素导致的断裂行为是不可忽视的。鉴于目前对多跨度混凝土梁研究较少,本文将基于相场法对多跨度的混凝土三点弯曲梁断裂性能进行模拟,旨在分析其断裂裂纹扩展及力学响应。首先,对相场法的相场长度尺寸参数l0以及网格划分尺度参数h的敏感性问题,验证了该模型的合理性;然后,对比相场模拟与试验得到的P-CMOD(裂缝张开位移)和裂纹扩展;最后,分析了跨高比与最大荷载Pmax之间的关系。结果表明相场法可以很好地再现混凝土梁的断裂裂纹扩展过程及其力学响应,进而为研究混凝土断裂提供一种新的模拟方法。

关键词：相场法准脆性断裂混凝土三点弯曲梁试样跨度

组分过敏原IgE检测显示屋尘螨特异性免疫治疗导致新增致敏的发生

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临床耳鼻咽喉头颈外科杂志 2024年第7期38卷 572-577页

作者：龙子怡张启迪邹知欣郑轶武陈建军华中科技大学同济医学院附属协和医院耳鼻咽喉科武汉430022 浩欧博生物技术集团有限公司

目的:由于患者过敏原分子致敏特征和脱敏制剂组成的差异,患者可能在过敏原特异性免疫治疗中产生新的致敏。本研究探讨屋尘螨特异性免疫治疗是否会产生新的致敏,以及新的致敏的临床重要性。方法:53例尘螨引起的过敏性鼻炎伴随或不伴随哮... 详细信息

目的:由于患者过敏原分子致敏特征和脱敏制剂组成的差异,患者可能在过敏原特异性免疫治疗中产生新的致敏。本研究探讨屋尘螨特异性免疫治疗是否会产生新的致敏,以及新的致敏的临床重要性。方法:53例尘螨引起的过敏性鼻炎伴随或不伴随哮喘患者接受为期1年的免疫治疗,14例患者作为对照组,按需接受对症药物治疗。分别在治疗前、治疗6个月及12个月采集患者血清,检测屋尘螨、粉尘螨及其组分过敏原(Der p 1/2/3和Der f 1/2/3)特异性IgE抗体及IgG4抗体水平(Der p,Der p 1/2,Der f,Der f 1/2),同时收集3个时间点的VAS评分。结果:免疫治疗1年后免疫治疗组患者Der p,Der p1/3及Der f 1/3特异性IgE抗体水平显著增高,尤其是Derp 3,其中69.2%(18/26)治疗前该过敏原阴性的患者转为阳性即产生新增过敏。免疫治疗组患者过敏原特异性IgG4抗体浓度1年后显著增高,VAS评分显著下降。对照组特异性IgE及IgG4抗体浓度及VAS评分和治疗前比较,无显著变化。新增致敏的患者和未新增致敏的患者比较,IgG4抗体浓度和VAS评分无显著性差异。结论:屋尘螨特异性免疫治疗产生了新的致敏,但其临床重要性并不清楚,有待进一步研究。

关键词：过敏原特异性免疫治疗屋尘螨新增致敏 IgE IgG4 分子致敏谱

Adaptive Trajectory Tracking Control for a Nonholonomic Mobile Robot

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Chinese Journal of Mechanical Engineering 2011年第4期24卷 546-552页

作者： CAO Zhengcai ZHAO Yingtao WU qidi College of Information Science and Technology Beijing University of Chemical Technology Beijing 100029 China State Key Laboratory of Robotics and System Harbin Institute of Technology Harbin 150001 China CIMS Research Center Tongji University Shanghai 200092 China

As one of the core issues of the mobile robot motion control, trajectory tracking has received extensive attention. At present, the solution of the problem only takes kinematic or dynamic model into account separately, so that the presented strategy is difficult to realize satisfactory tracking quality in practical application. Considering the unknown parameters of two models, this paper presents an adaptive controller for solving the trajectory tracking problem of a mobile robot. Firstly, an adaptive kinematic controller utilized to generate the command of velocity is designed based on Backstepping method. Then, in order to make the real velocity of mobile robot reach the desired velocity asymptotically, a dynamic adaptive controller is proposed adopting reference model and Lyapunov stability theory. Finally, through simulating typical trajectories including circular trajectory, fold line and parabola trajectory in normal and perturbed cases, the results illustrate that the control scheme can solve the tracking problem effectively. The proposed control law, which can tune the kinematic and dynamic model parameters online and overcome external disturbances, provides a novel method for improving trajectory tracking performance of the mobile robot.

关键词： nonholonomic mobile robot trajectory tracking model reference adaptive

聚焦过程质量:美国教养模式中幼儿发展循证评估的路径与启示

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幼儿教育 2024年第3期 86-90页

作者：薛启迪于冬青东北师范大学教育学部吉林长春130024

对幼儿发展进行循证评估有利于改善幼儿园过程质量。美国教养模式(Educare Model)通过计划为先一落实其后一评估审视一改进提升的循证评估路径,掌握幼儿发展的现实样态,检测学校教育质量并识别潜在的教育问题,为改进过程质量提供动态、... 详细信息

对幼儿发展进行循证评估有利于改善幼儿园过程质量。美国教养模式(Educare Model)通过计划为先一落实其后一评估审视一改进提升的循证评估路径,掌握幼儿发展的现实样态,检测学校教育质量并识别潜在的教育问题,为改进过程质量提供动态、持续、有效的证据。借鉴美国教养模式循证评估经验,优化我国幼儿发展评估工作:树立循证评估理念,提供循证评估指导;强调多元协同,鼓励联动式参与;主张动态发展,构建循证评估机制;依托数字赋能,开发证据资源库。

关键词：教养模式过程质量循证评估幼儿发展

A naive optimization method for multi-line systems with alternative machines

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Frontiers of Mechanical Engineering 2019年第4期14卷 377-392页

作者： Weichang KONG Fei QIAO qidi WU School of Electronics and Information Engineering Tongji UniversityShanghai 201804China

The scheduling of parallel machines and the optimization of multi-line systems are two hotspots in the field of complex manufacturing *** the two problems are considered simultaneously,the resulting problem is much more complex than either of *** sufficient training data for conventional data-based optimization approaches is difficult because of the high diversity of system ***,optimization of multi-line systems with alternative machines requires a simple mechanism and must be minimally dependent on historical *** define a general multi-line system with alternative machines,this study introduces the capability vector and matrix and the distribution vector and matrix.A naive optimization method is proposed in accordance with classic feedback control theory,and its key approaches are *** a reasonable target value is provided,the proposed method can realize closed-loop optimization to the selected objective *** studies are performed on a real 5/6-inch semiconductor wafer manufacturing facility and a simulated multi-line system constructed on the basis of the MiniFAB *** show that the proposed method can effectively and efficiently optimize various objective *** method demonstrates a potential for utilization in multi-objective optimization.

关键词： multi-line systems alternative machines feedback control closed-loop optimization

AncestryPainter:A Graphic Program for Displaying Ancestry Composition of Populations and Individuals

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Genomics, Proteomics & Bioinformatics 2018年第5期16卷 382-385页

作者： qidi Feng Dongsheng Lu Shuhua Xu CAS Key Laboratory of Computational Biology Max Planck Independent Research Group on Population GenomicsCAS-MPG Partner Institute for Computational BiologyShanghai Institutes for Biological SciencesChinese Academy of SciencesShanghai 200031China University of Chinese Academy of Sciences Beijing 100049China School of Life Science and Technology ShanghaiTech UniversityShanghai 201210China Center for Excellence in Animal Evolution and Genetics Chinese Academy of SciencesKunming 650223China Collaborative Innovation Center of Genetics and Development Shanghai 200438China Human Phenome Institute Fudan UniversityShanghai 201203China

Ancestry composition of populations and individuals has been extensively investigated in recent years due to advances in the genotyping and sequencing technologies. As the number of populations and individuals used for ancestry inference increases remarkably, say more than 100 populations or 1000 individuals, it is usually challenging to present the ancestry composition in a traditional way using a rectangular graph. To address this issue, we developed a program,AncestryPainter, which can illustrate the ancestry composition of populations and individuals with a rounded and nice-looking graph to save space. Individuals are depicted as length-fixed bars partitioned into colored segments representing different ancestries, and the population of interest can be highlighted as a pie chart in the center of the circle plot. In addition, AncestryPainter can also be applied to display personal ancestry in a way similar to that for displaying population *** is publicly available at http://***/PGG/***.

关键词： Graphic program Admixed populations Ancestry composition AncestryPainter Admixture proportions

A Task-oriented Modular and Agent-based Collaborative Design Mechanism for Distributed Product Development

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Chinese Journal of Mechanical Engineering 2014年第3期27卷 641-654页

作者： LIU Jinfei CHEN Ming WANG Lei WU qidi School of Electronics and Information Engineering Tongji University School of Mechanical Engineering Tongji University

The rapid expansion of enterprises makes product collaborative design （PCD） a critical issue under the distributed heterogeneous environment, but as the collaborative task of large-scale network becomes more complicated, neither unified task decomposition and allocation methodology nor Agent-based network management platform can satisfy the increasing demands. In this paper, to meet requirements of PCD for distributed product development, a collaborative design mechanism based on the thought of modularity and the Agent technology is presented. First, the top-down 4-tier process model based on task-oriented modular and Agent is constructed for PCD after analyzing the mapping relationships between requirements and functions in the collaborative design. Second, on basis of sub-task decomposition for PCD based on a mixed method, the mathematic model of task-oriented modular based on multi-objective optimization is established to maximize the module cohesion degree and minimize the module coupling degree, while considering the module executable degree as a restriction. The mathematic model is optimized and simulated by the modified PSO, and the decomposed modules are obtained. Finally, the Agent structure model for collaborative design is put forward, and the optimism matching Agents are selected by using similarity algorithm to implement different task-modules by the integrated reasoning and decision-making mechanism with the behavioral model of collaborative design Agents. With the results of experimental studies for automobile collaborative design, the feasibility and efficiency of this methodology of task-oriented modular and Agent-based collaborative design in the distributed heterogeneous environment are verified. On this basis, an integrative automobile collaborative R＆D platform is developed. This research provides an effective platform for automobile manufacturing enterprises to achieve PCD, and helps to promote product numeralization collaborative R＆D and manag

关键词： collaborative design task-oriented modular multi-agent collaboration mechanism collaborative platform

Research of Web-based Workflow Management System

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High Technology Letters 2001年第1期7卷 55-58页

作者：梁浩 Wu qidi SHI Junhao CIMS Research Center Tongji University

The state of the art of workflow management techniques in research is introduced. The research and development trends of Workflow Management System (WFMS) are presented. On basis of analysis and comparison of kinds of WFMSs, a WFMS based on Web technology and distributed object management is proposed. Finally, the application of the WFMS in supply chain management is described in detail.

关键词： Workflow management Web technology Supply chain management

Series Representation of Jointly S˛S Distribution via Symmetric Covariations

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Communications in Mathematics and Statistics 2021年第2期9卷 203-238页

作者： Yujia Ding qidi Peng Institute of Mathematical Sciences Claremont Graduate University1237 N.Dartmouth Ave.ClaremontCA 91711USA

We introduce the notion of symmetric covariation,which is a new measure of dependence between two components of a symmetricα-stable random vector,where the stability parameterαmeasures the heavy-tailedness of its *** covariation that exists only whenα∈(1,2],symmetric covariation is well defined for allα∈(0,2].We show that symmetric covariation can be defined using the proposed generalized fractional derivative,which has broader usages than those involved in this *** properties of symmetric covariation have been *** are either similar to or more general than those of the covariance functions in the Gaussian *** main contribution of this framework is the representation of the characteristic function of bivariate symmetricα-stable distribution via convergent series based on a sequence of symmetric *** series representation extends the one of bivariate Gaussian.

关键词： Symmetricα-stable random vector Symmetric covariation Generalized fractional derivative Series representation