Robustness analysis of signaling transduction networks based on Monte-Carlo method

The dynamic behaviors of cell system were deep ly affected by structural complexity of cell signal transduction networks and uncertainty of kinetics parameters. How to quantitatively determinate the relation between system behaviors and parameters variations was an important p roblem of systems biology. In order to study robustness of NF - κB signal transduction networks, the parameters of system model were assigned to subject to stochastic distributions. Then, robustness of system output signal NF - κBn with respect to 64 parameters variations and amp litude variation of step input signal IKK was studied by means of Monte - Carlo method. The simulation results demonstrate that the oscillation behavior of system output signal NF - κBn is closely relative to 6 key rate constantswhose robustness isweak, and the amp litude variation of step input signal IKKmakes a great impact on the oscillation behavior of system output

The design of robust PID controller based on genetic algorithms

将基于遗传算法的PID控制器设计方法应用于分布参数系统,在这个过程中,将系统的鲁棒性能指标作为目标函数选择的重要依据,使用遗传算法对PID参数进行寻优.仿真结果表明,由于加入鲁棒性信息,改进方法完全满足了控制系统的快速性、稳定性和准确性要求,控制系统表现出很好的动态鲁棒性及性能鲁棒性.In this paper,the design method of PID controller based on the genetic algorithm is applied to these parameter objects,and in this process,genetic algorithm is used for PID parameters optimization while the system robust performance is considered as an important basis for the selection of the objective function.The simulation results show that,due to adding the information of robustness,the rapidity,stability and accuracy requirements are fully met by the system,and the control system shows a very good dynamic and robust performance of robustness.福建省自然科学基金资助项目(A051002

线性自抗扰控制参数整定鲁棒性的根轨迹分析

从极点配置和根轨迹的角度研究了二阶线性定常对象的线性自抗扰控制.提出一个新传递函数框图.基于该框图,将线性自抗扰控制的参数整定解释为闭环极点配置问题,控制器带宽、观测器带宽等参数的整定被看作开环极、零点位置的选择.建议用根轨迹法研究线性自抗扰控制的鲁棒性.通过分析根轨迹定性说明了观测器带宽可以等于控制器带宽,以及线性自抗扰控制对被控对象参数变化的鲁棒性.国家自然科学基金项目(61733017);;福建省自然科学基金项目(2016J01317);;国家留学基金项目(201606315084)资助~

Robust IMC-PID Controller design with Unstable Pole Process

随着工业的发展，在实际工业过程控制系统中，有很多工业系统的过程模型存在不稳定环节如不稳定极点。由于这些不稳定环节的存在，系统的稳定性会受到强烈影响，其动态性能和鲁棒性能同时也会受到影响，针对含有不稳定环节过程模型的控制器设计方法及其参数整定成为目前迫切的控制技术。 针对一阶不稳定加时延过程模型（FOUPDT）和二阶不稳定加时延过程模型（SOUPDT），本文采用双闭环回路的设计方法。内环采用PID控制器中的比例控制器对系统过程模型和标称模型进行镇定，外环进行IMC-PID控制器的设计。在参数整定过程中，将参数整定问题转化为在约束条件下的最优化问题，同时考虑系统动态性能和鲁棒性能，将系统动态性能...With the development of industry, in the actual industrial process control system, there are many industrial systems of the process model which there are unstable poles. Due to the existence of these unstable zeros or poles, the stability of the system will be strongly affected, its dynamic performance and robust performance will also be affected.The controller design method and its parameter sett...学位：工学硕士院系专业：航空航天学院_工程硕士(控制工程)学号：2322014115337

Minimum Norm Partial Quadratic Eigenvalue Assignment Using Receptances and System Matrices

振动控制广泛用于许多振动结构体的设计、维护和评估.这主要包括大型挠性空间结构控制、多体动力学系统控制、地震工程控制、阻尼陀螺系统稳定性控制、机器人控制设计以及结构动力学中的振动控制等工程领域. 在实际工程应用中，振动结构体往往通过有限元方法等离散技巧被离散为一个二阶常微分控制系统，其中系数矩阵代表分配物理参数矩阵，如质量矩阵、阻尼矩阵和刚度矩阵等.但是，通过该二阶模型计算得到的自然频率和模态（即特征值和特征向量）与通过对实际振动结构体测量得到的自然频率和模态往往不一致.一个有效的办法就是采用主动反馈控制，即利用反馈控制外力使得结构体满足测量或指定的自然频率而且剩余的地自然频率和模态保持不变，...Vibration control is widely used in the design, maintenance, and evaluation of many vibrating structures in engineering, which includes the control of large flexible space structures, the control of mechanical multibody systems, earthquake engineering,stabilization of damped gyroscopic systems, robotics, and vibration control in structural dynamics, etc. In practical engineering applica...学位：理学硕士院系专业：数学科学学院_计算数学学号：1902014115260

IMC-PID Controller Design for Linear Systems with Parametric Uncertainties

控制系统控制品质的好坏直接决定了生产品质和效益，而工业过程控制中 百分之九十以上的控制器仍是PID控制器。于是，PID控制器参数整定一直以 来是工程应用和理论研究的核心问题之一。众多PID整定法中，IMC-PID控制 器参数整定方法脱颖而出，越来越广受工业控制过程的青睐。原因在于，基 于IMC的PID控制器对模型要求较低，甚至在高阶低阶、不稳定或非线性等情 况下，它都能获得有效的控制品质。而且IMC-PID仅有一个整定参数，该参数 调整与系统动态品质和鲁棒性的关系比较明确，从而无需繁杂的整定就可以使 系统同时具有较好的稳定性和鲁棒性。 由于需要确切的先验知识或工艺参数的有效估计...As is known to all, the control quality of control systems is the key to production quality and efficiency, whereas above ninety percentage of the controllers available in industrial process control are of PID type to date. Consequently, the PID controller parameter tuning has always been one of the core issues in both engineering applications and theoretical researches. Among numerous PID tuning ...学位：工学硕士院系专业：信息科学与技术学院_控制理论与控制工程学号：2322012115304

Automatic Facial Image Analysis based on Locality Preserving

人脸图像分析是一个具有重要理论意义和应用价值的研究方向。如何提取人脸图像特征、实现算法模型并在图像分析过程中获得更加高效、鲁棒的结果，吸引了模式识别、图像处理、计算机视觉、人工智能和神经网络等多个领域的众多学者对其进行研究。本文以人脸为研究对象，重点研究基于流形保持方法的图像特征提取与识别问题。主要工作如下： （1）基于流形保持的人脸图像聚类方法的研究。使用含有干扰信息的人脸图像集作为实验数据集，包含人脸的光照条件变化、遮挡情况变化、面部表情变化、样本数目变化以及随机像素点噪声等干扰因素。选取十种使用邻接图保持局部性的人脸图像分析方法进行聚类分析实验，根据实验结果，探究人脸图像干扰因素对流形...Automatic facial image analysis has very large theoretic and practical values. How to extract facial features, implement the algorithm and obtain more efficient results through facial image analysis and recognition, is attracting a large number of researchers to study from multiple fields such as pattern recognition, computer vision, artificial intelligence and neural network. This thesis focuses ...学位：工程硕士院系专业：信息科学与技术学院_工程硕士(计算机技术)学号：2302014115318

Outlier detection based on random forest

摘要: 提出一种基于随机森林方法的异常样本 (outliers)检测方法。仿真实验表明 ,与其他 2种基于 距离的异常样本检测技术相比 ,这种方法可以更好地提高模型的准确率 ,且具有较强的鲁棒性 ,在处 理大规模数据集时还能显著地减少计算时间。Abstract: It intr oduces an outliers detecti on method based on random forest . Compared with the other t wo common outliers detecti on methods based on distance, the p roposed method can i mp r ove the performance and robustness of the model and can als o reduce the computati on ti me

A parallel thinning method based on image marking

2000-2001 > Academic research: refereed > Publication in refereed journalVersion of RecordPublishe