检索结果-内蒙古大学图书馆

IEEE International Symposium on Industrial Electronics (ISIE)

作者： Z. Mihajlovic A. Goluban M. Zagar Department of Electronics Microelectronics Computer and Intelligent Systems Faculty of Electrical Engineering and Computing University of Zagreb Zagreb Croatia Department of Control and Computer Engineering in Automation Faculty of Electrical Engineering and Computing University of Zagreb Zagreb Croatia

This paper describes B-spline interpolation and compares it with other reconstruction methods, especially in three-dimensional space. We first consider the B-spline bases in the terms of convolution in signal processing. The presented analysis requires careful usage of continuous and discrete representation of B-spline. Emphasis is given to the important difference between B-spline interpolation and approximation. The difference is shown through frequency domain analysis, so we derive frequency responses of the B-spline interpolation and approximation. We conclude by demonstrating the use of several reconstruction filters and appropriate gradient estimators in volume rendering. Exact reconstruction in volume visualization is very important in many industrial applications, such as material cavity control.

关键词： Frequency domain analysis Spline Interpolation Image reconstruction Convolution Filters Polynomials Data visualization Frequency response Microelectronics

来源：评论

学校读者我要写书评

暂无评论

The B-spline interpolation in visualization

引用

Journal of computing and Information Technology 1999年第3期7卷 245-253页

作者： Mihajlović, Željka Goluban, Alan Department of Electronics Microelectronics Computer and intelligent Systems Faculty of Electrical Engineering arid Computing University of Zagreb Unska 3 Zagreb10 000 Croatia Department of Control and Computer Engineering in Automation Faculty of Electrical Engineering and Computing University of Zagreb Unska 3 Zagreb10 000 Croatia

The volume data is generally in the form of the large array of numbers. In order to render the object hidden in the volumetric data, we need to reconstruct or interpolate data values between the samples. The novelty presented in this paper is B-spline interpolation in the volumetric space. We show that this approach is better than currently used methods. We also present a hybrid approach, analyze this approach in frequency domain and compare it to B-spline interpolation. To enhance the quality during the volume visualization process it is important to enhance the quality of the reconstruction. It is of crucial importance to explore different undesired effects. If better reconstruction is performed the more accurate result of volume visualization process is achieved.

关键词： Volume rendering

来源：评论

学校读者我要写书评

暂无评论

Evolutionary robust servo control system design with time-domain constraints

引用

control and Intelligent Systems 1999年第3期27卷 103-107页

作者： Tan, K.C. Department of Electrical Engineering National University of Singapore 10 Kent Ridge Crescent Singapore 119260 Singapore University of Glasgow Centre for Systems and Control Evolutionary Computing Group Glasgow National University of Singapore Department of Electrical Engineering

This paper develops an evolutionary algorithm-based methodology for robust DC servomotor control system design. Unlike conventional methods, the evolutionary design technique is capable of simultaneously solving mixed-sensitivity optimization and incorporating practical time-domain constraints without the need for a differentiable performance index. Experimental results show that the evolutionary design can include practical constraints such as actuator saturation and offer an excellent closed-loop performance with good robustness in the presence of nonlinear constraints, disturbances, and plant uncertainties.

关键词： control system synthesis

来源：评论

学校读者我要写书评

暂无评论

Signal segmentation using time-scale signal analysis 9

Signal segmentation using time-scale signal analysis

引用

9th European Signal Processing Conference, EUSIPCO 1998

作者： Procházka, Aleš Kolínová, Magdaléna Stříbrsky, Jaroslav University of Chemical Technology Department of Computing and Control Engineering Technická 1905 Prague 6166 28 Czech Republic

Change-point detection is a fundamental problem in many areas of signal segmentation, feature extraction and classification. There are various statistical methods that can be applied to estimate boundaries of signal segments. The paper presents another method based upon the wavelet transform and signal decomposition used to detect signal irregularities. This approach can be very efficient if the initial wavelet function is carefully chosen. Basic methods presented in the paper are verified for simulated sequences at first and then used for biomedical signal segmentation. Resulting algorithms are written in the MATLAB environment.

关键词： Signal analysis

来源：评论

学校读者我要写书评

暂无评论

Modelling and control of Water Supply Systems

引用

IFAC Proceedings Volumes 1998年第20期31卷 543-548页

作者： Nedjeljko Perić Ivan Petrović Ante Magzan University of Zagreb Croatia Faculty of Electrical Engineering and Computing Department of Control and Computer Engineering in Automation Končar-Electrical Engineering Institute Zagreb Croatia

A dynamical mathematical model of a water supply plant based on lumped parameters is described. A concept of its control system is proposed that ensures output pressure stabilisation under conditions of variable water consumption and variable water recourses. The control system consists of inner control loops which control the flow of each pump station and of a superimposed control loop that controls the output pressure of the water supply plant. The pressure controller calculates the cumulative reference value of the water flow for all controlled pumps and from this value an algorithm for the flow distribution calculates the reference flow for each inner loop, taking into account the level of water accumulation in each water well. control performances of output pressure obtained by a conventional PI controller and a fuzzy logic based controller are compared.

关键词： Large-scale systems Pressure control Flow control Pipelines Plants Mathematical models Fuzzy control

来源：评论

学校读者我要写书评

暂无评论

Comparison of the self-tuning generalized predictive controller and pole placement controller

Comparison of the self-tuning generalized predictive control...

引用

Mediterranean Electrotechnical Conference (MELECON)

作者： I. Santro N. Peric I. Petrovic Faculty of Electrical Engineering and Computing Department of Control and Computer Engineering in Automation University of Zagreb Zagreb Croatia

The basic principles of the self-tuning generalized predictive controller (GPC) and the self-tuning pole placement controller are presented. A laboratory shell-and-tube heat exchanger is used to test the properties of the presented controllers. The self-tuning GPC were compared with the self-tuning pole placement controller regarding their parameter adjustment complexity, reference and disturbance step responses and robustness to differences between the real process and its mathematical model.

关键词： State feedback Automatic control Predictive models Optimal control Costing Cost function control engineering computing Laboratories Testing Robust control

来源：评论

学校读者我要写书评

暂无评论

Rudder servo-system fault diagnosis using neural network fault modeling

Rudder servo-system fault diagnosis using neural network fau...

引用

OCEANS

作者： Z. Vukic D. Pavlekovic H. Ozbolt Faculty of Electrical Engineering and Computing Department of Control and Computer Engineering in Automation University of Zagreb Zagreb Croatia

The model based fault detection and identification scheme for the rudder servo system as the actuator in the closed loop course keeping control system is presented. The nonlinear process model that enables description of a wide class of fault types is given and the fault function as the residual for detecting and identifying the fault is introduced. A fault detection scheme with variable thresholds is suggested and its performance has been tested via simulation in the presence of modeling uncertainty and noise. A fault identification scheme based on comparison between the fault function estimate and the output of a predefined analytical fault model is suggested.

关键词： Fault diagnosis Neural networks Fault detection control systems Automatic control Actuators control system synthesis Redundancy control engineering computing Computer networks

来源：评论

学校读者我要写书评

暂无评论

Economic feasibility and success factors in information technology implementation: a case study

Economic feasibility and success factors in information tech...

引用

International Conference on engineering and Technology Management (IEMC)

作者： P.J. Sanchez Inchusta A. Pina G. Buldain Department of Mathematics and Computing and Control Engineering Universidad Publica슠de Navarra Navarra Spain

The aim of this article is to verify, in the economic feasibility analysis phase, the factors which either promote or limit the successful introduction and implementation of new information technology, and to do this by means of a case study. These factors are studied in the framework of the interpretative theory of the evaluation of information technology and the theory of reasoned action in the decision taking process.

关键词： Information technology Computer aided software engineering Environmental economics Application software Temperature distribution Humidity Mathematics control engineering computing control engineering Information analysis

来源：评论

学校读者我要写书评

暂无评论

Improved Fuzzy Autopilot for Track-Keeping

引用

IFAC Proceedings Volumes 1998年第30期31卷 123-128页

作者： Zoran Vukić Edin Omerdić Ljubomir Kuljaca University of Zagreb Faculty of Electrical Engineering and Computing Department of Control and Computer Engineering in Automation Unska 3 HR-10000 Zagreb Croatia University of Tuzla Faculty of Electrical and Mechanical Engineering Department of Control Engineering in Automation Franjevačka 2 BH-75000 Tuzla Bosnia and Herzegovina

Improved 2-input fuzzy autopilot for ship course control and 3-input fuzzy autopilot for track-keeping are proposed. Nonlinear model of a ship and a steering subsystem is used. The 3-input fuzzy autopilot uses heading signal, yaw rate signal and lateral offset from the nominal track to produce a command rudder angle. Input variable fuzzyfication, fuzzy associative memory rules and output set defuzzyfication are described. Obtaining of FAM rules for 3-input fuzzy is described. Dynamical behavior of 2 and 3-input fuzzy autopilot is compared. The influence of wave disturbance, sea current and external disturbance from a passing ship on track-keeping performance was analyzed.

关键词： Disturbance rejection Fuzzy control Nonlinear control systems Ship control

来源：评论

学校读者我要写书评

暂无评论

Adaptive FIR filter use for signal noise cancelling

Adaptive FIR filter use for signal noise cancelling

引用

IEEE Workshop on Neural Networks for Signal Processing

作者： M. Kolinova A. Prochazka M. Mudrova Department of Computing and Control Engineering Technická 1905 Prague University of Chemical Technology Prague Czech Republic

Noise reduction, together with signal modelling, classification and prediction, forms a basic problem in many engineering, biomedical and econometric systems. The paper summarizes basic adaptive methods based upon the application of artificial neural networks simplified in many cases to an adaptive linear element only. Adaptive noise cancelling algorithms by such finite impulse response (FIR) filters are studied in the first part of the paper both for the case that a reference signal is known and for reference-free structures. Resulting signals are compared with those obtained by noise rejection in the wavelet transform domain either based upon signal decomposition and reconstruction using properly chosen threshold levels for signal modification or incorporating adaptive FIR filtering. Signals preprocessed in this way are then used for their segmentation and classification to verify the effect of signal denoising. Methods presented in the paper are used for simulated signals at first and then applied to the processing of real signals representing physiological signals and technological time series.

关键词： Finite impulse response filter Noise cancellation Signal processing Adaptive filters Noise reduction Predictive models Biomedical engineering Econometrics Artificial neural networks Noise level

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：