检索结果-内蒙古大学图书馆

A recursive Attribute Reduction algorithm and Its Application in Predicting the Hot Metal Silicon Content in Blast Furnaces

引用

BIG DATA AND COGNITIVE COMPUTING 2025年第1期9卷 6-6页

作者： Li, Zhanqi Cheng, Pan Yin, Linzi Guan, Yuyin Cent South Univ Sch Elect Informat Changsha 410083 Peoples R China

For many complex industrial applications, traditional attribute reduction algorithms are often inefficient in obtaining optimal reducts that align with mechanistic analyses and practical production requirements. To solve this problem, we propose a recursive attribute reduction algorithm that calculates the optimal reduct. First, we present the notion of priority sequence to describe the background meaning of attributes and evaluate the optimal reduct. Next, we define a necessary element set to identify the "individually necessary" characteristics of the attributes. On this basis, a recursive algorithm is proposed to calculate the optimal reduct. Its boundary logic is guided by the conflict between the necessary element set and the core attribute set. The experiments demonstrate the proposed algorithm's uniqueness and its ability to enhance the prediction accuracy of the hot metal silicon content in blast furnaces.

关键词： attribute reduction priority sequence recursive algorithm silicon content

来源：评论

学校读者我要写书评

暂无评论

Tunable wavelength laser surface profilometry through tilted interference

引用

MEASUREMENT 2025年第PartA期242卷

作者： Harikrishnan, P. Naik, Dinesh N. Indian Inst Space Sci & Technol Dept Phys Appl & Adapt Opt Lab Thiruvananthapuram 695547 Kerala India

Frequency-tunable lasers allow the removal of phase ambiguities in interferometric profilometry through the synthetic wavelength longer than height variations in the sample. The subsequent measurements lowering synthetic wavelengths and updating phase difference values improves the measurement. The surface profilometry on samples with tilted interference can lead to an initial synthetic phase map, though locally unambiguous, getting globally wrapped whose unwrapping can be difficult in the presence of noise. Starting with the synthetic phase map that is locally unambiguous but globally wrapped can still update the phase values through a recursive algorithm. The artefact of 2 pi jumps in the initial wrapped synthetic phase just gets carried forward which can be easily removed from the final phase map obtained with the shortest possible synthetic wavelength. Choosing a point on the sample surface as the point of comparison, the proposed interferometry scheme can be made immune to surrounding vibrations while tuning wavelengths.

关键词： Tunable wavelength laser Synthetic wavelength Point of comparison recursive algorithm Phase unwrapping

来源：评论

学校读者我要写书评

暂无评论

Bridge response separation method based on recursive variational mode decomposition

引用

SMART MATERIALS AND STRUCTURES 2025年第4期34卷

作者： Song, Xiaodong Yu, Yang Li, Guangqi Feng, Libo Lu, Xian Southeast Univ Sch Transportat Nanjing 211189 Peoples R China Shandong Transportat Res Inst Jinan 250031 Shandong Peoples R China China Railway Design Corp Tianjin 300308 Peoples R China China Railway Shanghai Grp Co Ltd Shanghai 200071 Peoples R China

Due to the influence of various factors on bridge sensors, the signals obtained often contain multiple signal components, including temperature and vehicle induced effect. It is necessary to separate and analyze individual signals in bridge health detection. In order to separate temperature and vehicle response components from complex signals, this article proposes an improved variational mode decomposition (VMD) algorithm based on recursive methods, which takes the mean value of each recursive block as the eigenvalue, fits the eigenvalues of each recursive block using the least squares method, and separates the first intrinsic mode function. The applicability of this method in the field of bridges was first verified through modal decomposition of simulated deflection and strain data. Then based on the health monitoring data of the Jingtai Expressway viaduct, the rapid separation of temperature response and vehicle response of the bridge has been achieved. The results indicate that the recursive method, in an online continuous decomposition environment, is approximately seven times faster than the traditional VMD algorithm. Moreover, when setting the same penalty factor, the mean square error obtained from separating finite element simulation data is smaller than that of VMD, and the separated actual measurement data has a higher correlation coefficient with temperature. This resolves the computational speed issue of the VMD algorithm in real-time bridge health monitoring, demonstrating the feasibility of the recursive algorithm, and effectively separates signals related to temperature and vehicles.

关键词： variational mode decomposition recursive algorithm bridge modal decomposition

来源：评论

学校读者我要写书评

暂无评论

Toward reasonable and efficient simulations: A distributed model based on improved mechanism and confluence algorithm

引用

CATENA 2025年 249卷

作者： Chen, Lei Guo, Chenxi Zhu, Kaihang Wang, Yiwen Pu, Yu Shen, Zhenyao Beijing Normal Univ Sch Environm State Key Lab Water Environm Simulat Beijing 100875 Peoples R China

Adequate description of phosphorus processes and high computational demand are core challenges in watershed modeling. In this study, a distributed model was developed, including rainfall-runoff module, erosion module, soil enrichment-loss module, watershed confluence-dissipation module, and river transmission module. To improve the efficiency of the distributed model, the recursive algorithms and Hash Tables are used. Besides, the Colloidal Phosphorus (CP) module was also added as its fate differs from Dissolved P (DP) and Particulate P (PP). The erosion module and soil P enrichment and loss module are modified based on the loss equations of colloids and CP with pH. The case stuty in the Three Gorges Reservoir area of China shows that the R2 and NSE of the distributed model are greater than 0.4, indicating a good model performance. Compared with traditional models, the developed model has been improved in terms of computational efficiency and P process description. Compared with forward confluence method, the running time of new model is reduced from 6 s to 0.5 s. Also its calibration time was 66 ' 4 '', 40 ' 8 '' and 25 ' 3 '' at a grid scale of 30 m, 40 m and 50 m, respectively. Compared to conventional two-phase model that can misestimate P loss, the new model can provide reasonable results. The developed model provides a methodological basis for precise simulation and prevention of non-point source pollution.

关键词： Soil erosion Nonpoint source pollution Distributed hydrological model Colloidal phosphorus recursive algorithm

来源：评论

学校读者我要写书评

暂无评论

recursive algorithms for parameter estimation with adaptive quantizer

引用

AUTOMATICA 2015年 52卷 192-201页

作者： You, Keyou Tsinghua Univ Dept Automat Beijing 100084 Peoples R China

This paper studies a parameter estimation problem of networked linear systems with fixed-rate quantization. Under the minimum mean square error criterion, we propose a recursive estimator of stochastic approximation type, and derive a necessary and sufficient condition for its asymptotic unbiasedness. This motivates to design an adaptive quantizer for the estimator whose strong consistency, asymptotic unbiasedness, and asymptotic normality are rigorously proved. Using the Newton-based and averaging techniques, we obtain two accelerated recursive estimators with the fastest convergence speed of O(1/k), and exactly evaluate the quantization effect on the estimation accuracy. If the observation noise is Gaussian, an optimal quantizer and the accelerated estimators are co-designed to asymptotically approach the minimum Cramer-Rao lower bound. All the estimators share almost the same computational complexity as the gradient algorithms with un-quantized observations, and can be easily implemented. Finally, the theoretical results are validated by simulations. (C) 2014 Elsevier Ltd. All rights reserved.

关键词： Parameter estimation recursive algorithm Quantization Asymptotic analysis Convergence speed

来源：评论

学校读者我要写书评

暂无评论

recursive algorithms for stock liquidation: A stochastic optimization approach

引用

SIAM JOURNAL ON OPTIMIZATION 2002年第1期13卷 240-263页

作者： Yin, G Liu, RH Zhang, Q Wayne State Univ Dept Math Detroit MI 48202 USA Univ Georgia Dept Math Athens GA 30602 USA

This work develops stochastic optimization algorithms for a class of stock liquidation problems. The stock liquidation rules are based on hybrid geometric Brownian motion models allowing regime changes that are modulated by a continuous-time finite-state Markov chain. The optimal selling policy is of threshold type and can be obtained by solving a set of two-point boundary value problems. The total number of equations to be solved is the same as the number of states of the underlying Markov chain. To reduce the computational burden, using a stochastic optimization approach, recursive algorithms are constructed to approximate the optimal threshold values. Convergence and rates of convergence of the algorithm are studied. Simulation examples are presented, and the computation results are compared with the analytic solutions. Finally, the algorithms are tested using real market data.

关键词： geometric Brownian motion regime change stochastic optimization recursive algorithm

来源：评论

学校读者我要写书评

暂无评论

recursive algorithms for identification in closed loop - A unified approach and evaluation

Recursive algorithms for identification in closed loop - A u...

引用

35th IEEE Conference on Decision and Control

作者： Landau, ID Karimi, A Lab d'Automatique de Grenoble Saint Martin d'Heres France

ISBN: (纸本)0780335910

A unified presentation of recursive algorithms for plant model identification in closed loop is given. From the basic formulation of the problem of finding the plant model which gives the best predictor for the closed loop system the two families of algorithms using either a re-parameterized predictor for the closed loop or a plant predictor operating on filtered data are presented and their asymptotic properties are examined. Validation tests for the models identified in closed loop are proposed.

关键词： recursive algorithm closed loop identification model validation stability stochastic convergence

来源：评论

学校读者我要写书评

暂无评论

A recursive LEAST ERROR SQUARES algorithm FOR POWER-SYSTEM RELAYING AND MEASUREMENT APPLICATIONS

引用

IEEE TRANSACTIONS ON POWER DELIVERY 1991年第3期6卷 1008-1015页

作者： SACHDEV, MS NAGPAL, M Power System Research Group University of Saskatchewan Saskatoon Canada

This paper describes a recursive algorithm suitable for microprocessor based power system relaying and measurement applications. The algorithm is designed using the least error squares curve fitting technique. The mathematical background for the non-recursive least error squares algorithm is extended to form a recursive algorithm. A method for including decaying dc and harmonic frequencies in the algorithm is described. Finally, sample studies are presented to demonstrate the performance of the developed algorithm.

关键词： POWER SYSTEM PROTECTION DIGITAL RELAYING RELAYING algorithm recursive algorithm

来源：评论

学校读者我要写书评

暂无评论

A recursive ECONOMIC-DISPATCH algorithm FOR ASSESSING THE COSTS OF THERMAL GENERATOR SCHEDULES

引用

IEEE TRANSACTIONS ON POWER SYSTEMS 1992年第2期7卷 577-583页

作者： WONG, KP DOAN, K Department of Electrical and Electronic Engineering University of Western Australia Nedlands WA Australia

This paper develops an efficient, recursive algorithm for determining the economic power dispatch of thermal generators within the unit commitment environment. A method for incorporating the operation limits of all on-line generators and limits due to ramping generators is developed in the paper. The developed algorithm is amenable for computer implementation using the artificial intelligence programming language, Prolog. The performance of the developed algorithm is demonstrated through its application to evaluate the costs of dispatching 13 thermal generators within a generator schedule in a 24-hour schedule horizon.

关键词： ECONOMIC DISPATCH GENERATOR SCHEDULING recursive algorithm FUEL COST

来源：评论

学校读者我要写书评

暂无评论

Chaos time-series prediction based on an improved recursive Levenberg-Marquardt algorithm

引用

CHAOS SOLITONS & FRACTALS 2017年 100卷 57-61页

作者： Shi, Xiancheng Feng, Yucheng Zeng, Jinsong Chen, Kefu South China Univ Technol Sch Light Ind & Engn Guangzhou 510641 Guangdong Peoples R China State Key Lab Pulp & Paper Engn Guangzhou 510641 Guangdong Peoples R China

An improved recursive Levenberg-Marquardt algorithm (RLM) is proposed to more efficiently train neural networks. The error criterion of the RLM algorithm was modified to reduce the impact of the forgetting factor on the convergence of the algorithm. The remedy to apply the matrix inversion lemma in the RLM algorithm was extended from one row to multiple rows to improve the success rate of the convergence;after that, the adjustment strategy was modified based on the extended remedy. Finally, the performance of this algorithm was tested on two chaotic systems. The results show improved convergence. (C) 2017 Elsevier Ltd. All rights reserved.

关键词： recursive algorithm Levenberg-Marquardt On-line leaming Neural networks

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：