共查询到19条相似文献,搜索用时 430 毫秒
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Feng ShanDept. of Aut. Control Eng. Huazhong Univ. of Sci. Tech. Wuhan China 《系统工程与电子技术(英文版)》1991,(2)
An AI-aided simulation system embedded in a model-based, aspiration-led decision support system NY-IEDSS is reported. The NY-IEDSS is designed for mid-term development strategic study of the Nanyang Region in Henan, China, and is getting beyond its prototype stage under the decision maker's (the end user) orientation. The integration of simulation model system, decision analysis and expert system for decision support in the system implementation was reviewed. The intent of the paper is to provide insight as to how system capability and acceptability can be enhanced by this integration. Moreover, emphasis is placed on problem orientation in applying the method. 相似文献
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FENG ShanDepartment of Automatic Control EngineeringHuazhong University of Science TechnologyWuhan Hubei PRC 《系统科学与系统工程学报(英文版)》1992,(2)
An Al-aided simulation system embedded in a model-based, aspiration-led decision support system NY-IEDSS is reported. The NY-IEDSS is designed for mid-term development strategic study of the Nanyang Region in Henan, China, and is getting beyond its prototype stage under the decision maker's (the end user) orientation. The integration of simulation model system, decision analysis and expert system for decision support in the system implementation was reviewed. The intent of the paper is to provide insight as to how system capability and acceptability can be enhanced by this integration. Moreover, emphasis is placed on problem orientation in applying the method. 相似文献
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Some existing methods for chaos control in engineering fields are analyzed and their drawbacks are pointed out. A tracking method can solve these problems to some extent, but it still depends on the mathematical model of the system to be controlled. An intelligent method based on fuzzy neural network (FNN) is used to control chaos in engineering fields. The FNN is employed to learn the inherent dynamics from the input and output of chaos, which can be used in the inverse system method, so that the method is free of the exact mathematical model of the system to be controlled. This intelligent method is compared with tracking method in the presence of measurement noise and model error. Simulation results show its superiority and feasibility. 相似文献
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In aerial robots' visual navigation, it is essential yet very difficult to detect the attitude and position of the robots operated in real time. By introducing a new parametric model, the problem can be reduced from almost unmanageable to be partly solved, though not fully, as per the requirement. In this parametric approach, a multi-scale least square method is formulated first. By propagating as well as improving the parameters down from layer to layer of the image pyramid, a new global feature line can then be detected to parameterize the attitude of the robots. Furthermore, this approach paves the way for segmenting the image into distinct parts, which can be realized by deploying a Bayesian classifier on the picture cell level. Comparison with the Hough transform based method in terms of robustness and precision shows that this multi-scale least square algorithm is considerably more robust to noises. Some discussions are also given. 相似文献
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The active contour model based on local image fitting (LIF) energy is an effective method to deal with intensity inhomo- geneities, but it always conflicts with the local minimum problem because LIF has a nonconvex energy function form. At the same time, the parameters of LIF are hard to be chosen for better per- formance. A global minimization of the adaptive LIF energy model is proposed. The regularized length term which constrains the zero level set is introduced to improve the accuracy of the bound- aries, and a global minimization of the active contour model is presented, in addition, based on the statistical information of the intensity histogram, the standard deviation σ with respect to the truncated Gaussian window is automatically computed according to images. Consequently, the proposed method improves the performance and adaptivity to deal with the intensity inhomo- geneities. Experimental results for synthetic and real images show desirable performance and efficiency of the proposed method. 相似文献
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Abdollah Kavousi-Fard Taher Niknam Mohammad-Reza Akbari-Zadeh Bahram Dehghan 《系统工程与电子技术(英文版)》2014,25(5):901-910
Optimal distribution feeder reconfiguration (DFR) is a valuable and costless approach to increase the load balance, reduce the amount of power losses, and improve the voltage of the buses. In this way, this paper aims to investigate the optimal DFR strategy as a proper tool to improve the reliability of the radial distribution networks. The idea of failure rate reduction is employed to see the effect of feeder current reduction on the reliability of the system more accurately. The objects to be investigated are system average interruption frequency index (SAIFI), system average interruption duration index (SAIDI), average energy not supplied (AENS) and total active power losses. The problem is then formulated in a stochastic framework based on the point estimate method (PEM) to handle the uncertainty effects. The feasibility and satisfying performance of the proposed method is examined on a standard IEEE test system. 相似文献
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The visual serving stabilization for a kind of nonholonomic mobile robots with uncalibrated camera parameters is investigated based on the visual feedback and the state and input transformations. The authors obtain a new uncertain model of the nonholonomic kinematic system in the image plane,which is a chained form with uncalibrated visual parameters,from the camera robotic system. A new time varying feedback controller is proposed for the exponential stabilization of the nonholonomic chained system with unknown parameters by using state-scaling and switching technique.The exponential stability of the closed loop system is rigorously proved.Simulation results demonstrate the effectiveness of the proposed methods. 相似文献
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ON COMPLEXITY OF POWER SYSTEMS 总被引:1,自引:1,他引:0
MAJin CHENGDaizhan HONGYiguang 《系统科学与复杂性》2003,16(3):391-403
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The Radial Basis Functions Neural Network (RBFNN) is used to establish the model of a response system through the input and output data of the system. The synchronization between a drive system and the response system can be implemented by employing the RBFNN model and state feedback control. In this case, the exact mathematical model, which is the precondition for the conventional method, is unnecessary for implementing synchronization. The effect of the model error is investigated and a corresponding theorem is developed. The effect of the parameter perturbations and the measurement noise is investigated through simulations. The simulation results under different conditions show the effectiveness of the method. 相似文献
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郑建德 《系统工程与电子技术(英文版)》2003,14(1)
Abstract: Two mathematical models are developed in this paper to study the effectiveness of system administration effortson the improvement of system availability, based on the assumption that there exists a transitional state for a computer sys-tem in operation before it is brought down by some hardware or software problems and with intensified system administra-tion efforts, it is possible to discover and fix the problems in time to bring the system back to normal state before it isdown. Markov chain is used to simulate the transition of system states. A conclusion is made that increasing system admin-istration efforts may be a cost-effective way to meet the requirements for moderate improvement on system availability, buthigher demand on this aspect still has to be met by advanced technologies. 相似文献
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交通微观仿真中的驾驶员视觉感知模型 总被引:1,自引:0,他引:1
驾驶员视觉感知模型是交通微双肪真中机动车模型的—部分,其作用是表现出实际驾驶活动中,驾驶员对外界的视觉感知能力,也就是哪些物体可以被驾驶员看到,哪些不能。通过驾驶员视觉关注焦点的移动规律、视场范围和障碍物遮挡等3个方面的研究,提出了一个新的驾驶员视觉感知模型,并注意了该模型的运算速度问题。通过计算机模拟实际场景,对比受试者和模型标注的感知对象,完成了模型有效性验证。对10位受试者进行了194次测试,受试者标注了528个目标,而感知机模型标注了516个目标,其中吻合率为84.30%,漏检率17.61%,误检率15.34%。对出现差异的情况进行细致地分析,可以发现这些差异全部来源于受试者的感觉误差,而且受试者在看到视觉感知模型的输出后,没有一例表现出异议。此外,该模型在避免以往的理想全局明縻模式的带来的缺点的同时1还能使模型的计算量大为减少。 相似文献
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在线估计雅可比矩阵的视觉伺服控制算法 总被引:1,自引:0,他引:1
机器人视觉伺服系统是机器人研究领域的一个重要研究方向。以图像为基础的视觉伺服机器人模型中,有许多的不确定性,如机器人动力学模型,运动学模型,摄像机系统以及雅可比矩阵等。多数的视觉伺服系统往往只考虑某一、两个部分,而其它的不确定性依然影响定位目标的精度。在使用了神经网络的控制器中加入卡尔曼滤波,在摄像机与机器人坐标系无标定的情况下,对雅可比矩阵进行实时在线估计,从而提高了视觉伺服系统的精确性。仿真验证了本算法的可行性和有效性。Abstract: Robotic visual servo system is an important subject in the field of robots.Image-based visual servo model has a lot of uncertainties,for example,robot dynamics model,robot kinematics model,camera system and Jacobian matrix and so on.Most of visual servo methods always considered one or two aspects,but other uncertainties still affected the accuracy of tracking the target for the robot.Based on the traditional controller with neural network,a new control algorithm was provided in the uncalibrated camera and coordination systems with the Kalman filter that estimated Jacobian matrix on-line,thereby improving the accuracy of the system.Simulation result shows the feasibility and effectiveness of the algorithm. 相似文献
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视景仿真系统光学视觉通道技术研究与实现 总被引:6,自引:0,他引:6
研究了在视景仿真系统中应用多视觉通道图形显示技术时应注意的关键问题,仿真结果表明,多视觉通道技术的合理运用,能增加飞行视景仿真的“沉浸”感。结合该类系统的需要,提出了“光学通道”的概念。根据摄像机成像原理,得到了焦距与视场角的关系,实现了光学通道的变焦功能。该方法计算量小,实现简单,能满足仿真实时性的要求,具有重大的工程意义。 相似文献