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检索条件"主题词=Least square algorithm"

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Adaptive Sliding Mode Control for Robots Based on Fuzzy Support Vector Machines

Adaptive Sliding Mode Control for Robots Based on Fuzzy Supp...

引用

IEEE International Conference on Mechatronics and Automation

作者： Zhu, Dequan Mei, Tao Luo, Minzhou Chinese Acad Sci Inst Intelligent Machines Hefei Anhui Peoples R China

ISBN: (纸本)9781424426928

To improve the control precision of robots, the control method of adaptive sliding mode for robots was presented based on fuzzy support vector machines. The sliding mode control has complete adaptability to system disturbance and siring in sliding mode, which was used to automatically track the uncertainty of system parameters and external disturbance. Fuzzy support vector machines have strong treatment of nonlinear signal and generalization ability, which was used to reduce the chattering in sliding mode control. The FSVM controller parameters were optimized by hybrid learning algorithm, which combines least square algorithm with improved genetic algorithm, to get the optimal control performance with the controlled object. The simulation results of a two-link robotic manipulator demonstrated that the control method designed gets tracking effect with high precision and speed, as well as reduces chattering of control under the condition of existing model error and external disturbance.

关键词： robot sliding mode control fuzzy support vector machines genetic algorithm least square algorithm

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A Crosstalk Mitigation algorithm for OFDM-Carrying OAM Multiplexed FSO links

A Crosstalk Mitigation Algorithm for OFDM-Carrying OAM Multi...

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Opto-Electronics and Communications Conference (OECC) / Photonics Global Conference (PGC)

作者： Sun, Tengfen Liu, Minwen Li, Zhengxuan Li, Yingchun Zhang, Qianwu Wang, Min Shanghai Univ Shanghai Inst Adv Commun & Data Sci Key Lab Specialty Fiber Opt & Opt Access Networks Shanghai 200072 Peoples R China

ISBN: (纸本)9781509062935

In this paper, we experimentally demonstrate the performance of crosstalk mitigation for 16QAM-OFDM-carrying OAM multiplexed FSO links by using the pilot assisted least square (LS) algorithm. Crosstalk is introduced by demodulation holograms with random turbulent phase screen at the demodulation SLMs. Experimental results show that the proposed algorithm can efficiently improve the quality of constellations and reduce the bit-error rate (BER), and similar to 10 dB sensitivity improvement is obtained.

关键词： component Orbital angular momentum OFDM Channel equalization least square algorithm

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Design of Industrial Field Intelligent Temperature Acquisition System Based on Timestamped Anti-Interference algorithm

Design of Industrial Field Intelligent Temperature Acquisiti...

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IEEE Symposium Series on Computational Intelligence (SSCI)

作者： Yang, Chunjie Jiao, Bingchun Kang, Hongbo Li, Yanwei Liu, Yan Wu, Yifan Ma, Shujie Xian Univ Posts & Telecommun Sch Automat Xian Peoples R China Telchian Smart Ind Grp Co Ltd Jinan Peoples R China

ISBN: (纸本)9781728124858

At present, wired method is used widely in the acquisition and transmission of field signals in industrial field acquisition system. There are some problems such as long cables, difficult wiring, analog signals that are susceptible to interference and so on. A new design of industrial field intelligent temperature acquisition system based on timestamped anti-interference algorithm is presented in the paper. The system can collect analog signals of PT100 and convert that to digital signals which are transmitted to the control center by Data Transceiver. When the signals reach the control center, the system will process digital signals, and set up T-R relation table based on least square algorithm, and at last, the signals are restored to resistance signals of PT100 by using multichannel digital potentiometers. The system uses wireless transmission instead of wired transmission, to realize the collection, transmission and recovery of thermal resistance information, and solve the interference problem of long-distance wireless communication. Experimental test verify that the system communication is normal, stability and accurate, which provides a reasonable design scheme for the application of data transmission technology in industrial field.

关键词： intelligent temperature acquisition system design timestamped anti-interference algorithm long-distance wireless communication least square algorithm digital potentiometers

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On-Line Transmission Line Zero Sequence Impedance Estimation Using Phasor Measurement Units

On-Line Transmission Line Zero Sequence Impedance Estimation...

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22nd Australasian Universities Power Engineering Conference (AUPEC) - Green Smart Grid Systems

作者： Karegar, H. Kazemi. Alinejad, B. SBU Fac Elect & Comp Engn Tehran Iran

ISBN: (纸本)9789791884723

This Paper proposes a new algorithm for estimating the zero sequence impedance of a live transmission line by means of Phasor Measurement Units (PMU). In this algorithm the line impedance matrix is calculated and its sequence impedance matrix calculates by means of symmetrical components matrix. A case study contains a 230kv single circuit un-transposed transmission line was simulated and results are demonstrated. One of the main advantages of this algorithm is the ability of estimating the parameters in live or on-line condition which enables the system operators and adaptive protection systems to update their parameters online without needs to disconnect or short circuit the line. Results show the algorithm capability in estimating the short and medium transmission lines zero and positive sequence impedances. In a long transmission line the estimation error increases but limited to smaller than 20% of the real value.

关键词： Zero Sequence Impedance Phasor Measurement Unit Live parameter estimation least square algorithm symmetrical components

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Neural Network Based Fault Diagnosis and Reconfiguration Method for Multilevel Inverter

Neural Network Based Fault Diagnosis and Reconfiguration Met...

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20th Chinese Control and Decision Conference

作者： Xu, Bin Yang, Dan Wang, Xu Northeastern Univ Ctr Comp Shenyang 110004 Peoples R China

ISBN: (纸本)9781424417339

Multilevel inverter drivers have become widely applied in high-voltage and high-power applications. Therefore fault diagnosis of voltage source inverters is becoming more and more important. One possible fault within the inverter is IGBT open circuit fault. An overview of the different strategies to detect this fault is given, including the algorithms to localize the fault switch device. This paper presents a technique to improve the fault detection by using an algorithm of neural network with orthogonal basis functions based on recursion least square (RLS) technique. The method is used to identify the type and location of occurring faults from inverter output voltage measurement. Simulation examples of fault diagnosis by the use of the presented method were given. Simulation results have shown that the method performs satisfactorily to detect the fault type fault location and reconfiguration, so it will be very valuable in power system.

关键词： neural networks fault diagnosis multilevel inverter least square algorithm

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Fuzzy Support Vector Machines Control for Robotic Manipulator

Fuzzy Support Vector Machines Control for Robotic Manipulato...

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International Conference on Industry, Information System and Material Engineering

作者： Zhu, Dequan Mei, Tao Cao, Chengmao Anhui Agr Univ Coll Engn Hefei Peoples R China Chinese Acad Sci Inst Machine Intelligence Hefei Peoples R China Univ Sci & Technol China Dept Automat Hefei Peoples R China

ISBN: (纸本)9783037850275

To improve the control precision of robotic manipulator, fuzzy support vector machines control method for robotic manipulator was presented based on genetic algorithm and least square algorithm. Fuzzy algorithm was used to decouple joints. Using support vector machines, fuzzy logical control of complete process and treatment of non-linear signal were realized. The parameters of controller were optimized by hybrid learning algorithm. First, least square algorithm was used for off-line optimization to form support vector machines control system. Then, genetic algorithm was used for on-line optimization to get the optimal performance parameters of support vector machines and the optimal fuzzy proportional parameters. Simulation results of a two-link manipulator demonstrated that the control method designed gets tracking effect with high precision.

关键词： Robotic manipulator fuzzy control support vector machines least square algorithm genetic algorithm

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Enhanced Mobile Station Localization using a Hybrid TOA/AOA Map-Matching algorithm

Enhanced Mobile Station Localization using a Hybrid TOA/AOA ...

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IEEE Region 10 Conference 2009

作者： Mahajan, Sameera Singh, Y. N. Indian Inst Technol Kanpur Dept Elect Engn Kanpur Uttar Pradesh India

ISBN: (纸本)9781424445462

The time of arrival (TOA) and angle of arrival (AOA) measurements from base stations (BS) can be used to obtain the location of the mobile station (MS). For TOA Location estimation, Line of Position (LOP) and least square (LS) algorithms are usually used. To reduce the Non- line-of-sight (NLOS) errors maximum likelihood estimation (MLE) is performed in the constrained region. In this paper we propose few modifications in the NLOS LS method so as to improve the location estimation accuracy. In case of low NLOS noise environment, we observe that the Virtual Base Station (VBS) approach with modified NLOS LS method gives very high location estimation accuracy. In this paper the AOA method using residual test has also been proposed to obtain the height of Mobile Station above the ground. The AOA method also helps to obtain the location estimate when there are only two hearable BS. Using the location estimates thus obtained, we propose a hybrid TOA/AOA map-matching algorithm to obtain highly accurate location of the Mobile Station.

关键词： Time Delay Maximum Likelihood Estimation least square algorithm Residual Test Map Matching

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Terahertz time of flight imaging of hidden layers in oleo paintings 40

Terahertz time of flight imaging of hidden layers in <i>oleo...

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40th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz)

作者： Gomez-Sepulveda, A. M. Hernandez-Serrano, A. I. Castro-Camus, E. Ctr Invest Opt AC Guanajuato 37150 Mexico Occidente Secretaria Innovac Escuela Conservac & Restaurac Analco 285 Barrio de Analco Guadalajara 44450 Jalisco Mexico

ISBN: (纸本)9781479982721

In this work we use the echoes of THz radiation pulses reflected from multilayer systems in order to find hidden layers in an oleo on canvas painting. We fit the reflected waveforms to a superposition of various echoes using a least square algorithm in order to separate overlapping pulses owing to reflections in sub wavelength layers.

关键词： least squares approximations optical multilayers painting submillimetre wave imaging terahertz wave imaging THz radiation pulse reflection echo least square algorithm multilayer system oleo canvas painting terahertz time of flight imaging Art Image reconstruction Nonhomogeneous media Painting Surface waves Visualization

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SEM-Based Trust Evaluation Model and algorithm for B2C E-Commerce 17

SEM-Based Trust Evaluation Model and Algorithm for B2C E-Com...

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17th IEEE International Wireless Communications and Mobile Computing Conference (IEEE IWCMC)

作者： Ren, Xiang Henan Coll Ind & Informat Technol Zhengzhou 454000 Henan Peoples R China

ISBN: (纸本)9781728186160

With the advancement of information technology and the large-scale popularization of the Internet, the promotion and application of e-commerce has greatly promoted the information communication between the supply and demand sides, significantly reduced transaction costs, and effectively improved the overall economic benefits of enterprises and their participation in domestic and foreign markets Competence. This paper aims to study the B2C e-commerce trust evaluation model and algorithm based on SEM. Experiments based on the fuzzy theory-based B2C credit evaluation model construction equation and least squares algorithm to analyze the influencing factors of trust in B2C e-commerce. Experimental data shows that consumers' distrust of online merchants, in addition to factors other than the lack of security, also accounts for a large proportion of consumers' distrust of product quality and the merchant's after-sales service attitude. The development of e-commerce is likely to be on the rise. The experimental results show that through a survey of online shopping Internet users, people's trust in Internet shopping is as follows: all are unreliable 4%, a small part is reliable 14%, half are reliable and half are unreliable 60%, and most are reliable 18%, all reliable accounted for 1%, no clear attitude accounted for 3%. This paper is based on the SEM equation theory and the B2C credit evaluation model combined with fuzzy theory. It is of great significance for analyzing the factors affecting e-commerce trust and evaluating website customer trust. Through actual proof, it is found that the algorithm we research is effective and feasible.

关键词： SEM E-Commerce Trust Evaluation Model least square algorithm

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The Research on LED-based Spectrally Tunable Light Source for Star Simulator

The Research on LED-based Spectrally Tunable Light Source fo...

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International Conference on Optical Instruments and Technology - Optical Systems and Modern Optoelectronic Instruments

作者： Zhang Xiaojuan Zhang Guoyu Zhang Jian Changchun Univ Sci & Technol Changchun 130022 Peoples R China

ISBN: (纸本)9780819499608

In order to meet the requirements of multi-color temperature, high precision and wide spectrum, a large number of LED in different colors are used as internal light source for an integrating sphere. An asymmetric Gaussian function model is established to realize non-uniform spectral peak intervals. The research aims to find the desired spectral distribution of LED and the number in use through specific properties of the target spectrum to improve the obtained original fitting model. Simulation of spectral curve of specific color temperature can be realized through the simulation of standard blackbody spectral curve. The result shows that matching simulation error for small band is within 12%, and matching error verified by relative area method is within 4.63%.

关键词： star simulator LED tunable light source spectral simulation least square algorithm spectral fitting color temperature simulation

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