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检索条件"主题词=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...

引用

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

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

引用

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

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

引用

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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Noisy Blind Source Separation Based on Adaptive Noise Removal

Noisy Blind Source Separation Based on Adaptive Noise Remova...

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10th World Congress on Intelligent Control and Automation (WCICA)

作者： Tang, Hui Wang, Shu Hua Zhong Univ Sci & Technol Dept Elect & Informat Wuhan Peoples R China

ISBN: (纸本)9781467313988

A novel natural gradient algorithm with two-step pre-processing is proposed to solve the noise blind source separation problem. That is bias removal techniques followed by a de-noise processing based on least square. Then obtain an algorithm jointly estimating mixing-matrix and decreasing noise. In the condition of that sources are mutually independent and added-noise is independent with any source, computer simulations verify the algorithm is effective and perform better than traditional algorithm.

关键词： Blind Source Separation Natural Gradient algorithm least square algorithm

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Identification of quantifiers related to circadian rhythm variations 12

Identification of quantifiers related to circadian rhythm va...

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UKACC 12th International Conference on Control (CONTROL)

作者： Bonargent, Tristan Pigeon, Eric Martin, Tristan Pouliquen, Mathieu Gehan, Olivier Menard, Tomas M'Saad, Mohammed Normandie Univ UNICAEN ENSICAEN LAC F-14000 Caen France Normandie Univ UNICAEN INSERM COMETE F-14000 Caen France Rajamangala Univ Technol Thanyaburi Univ Tech Educ Mechatron Dept Khlong Hok Thailand

ISBN: (纸本)9781538628645

The aim of this study is to propose quantifiers allowing to characterize the adaptation speed of the circadian rhythm of a living being based on temperature measurements. While the most commonly used model to represent circadian rhythm is the COSINOR model, it is not adapted to analyze changes. An extended COSINOR model is then proposed here in order to take into account temperature disturbances related to the activity of the studied living being. The quantifiers are obtained in a two step process. First, the extended COSINOR parameters are determined with a modified recursive least square algorithm, which is modified in order to compensate for the lack of persistent excitation. The estimates of these parameters are further filtered in order to provide several quantifiers which provide useful information on the adaptation speed of the studied living being. The proposed methodology is evaluated on rats temperature measurements obtained from a laboratory experiment.

关键词： Circadian rhythm least square algorithm COSINOR jet lag hypergravity rats

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Error-driven adaptive, Virtual Machine Model-Based Control with High Availability Platform

Error-driven adaptive, Virtual Machine Model-Based Control w...

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11th IEEE International Conference on Machine Learning and Applications (ICMLA)

作者： Bura, Aman H. Chen, Bo Yu, Li Zhejiang Univ Technol Sch Informat Engn Hangzhou 310023 Zhejiang Peoples R China

ISBN: (纸本)9780769549132

An error-driven adaptive model-based control system, for optimizing machine or assembly plant performance and operation under normal and fault conditions, is proposed. In such complex system it is imperative to differentiate between a system failure and a sensor failure or between process noise and measurement noise. In this paper, we present a comprehensive approach based on a hierarchical, multilevel control techniques. The approach is designed to provide sensor measurement validation, associates a degree of integrity with each measurement, identifies faulty sensors, and estimates the actual system states and sensor values in spite of faulty measurements. Using Virtual Machine Model concept, the method is achieved in three steps: state prediction, fault detection & sensor measurement and system online update or correction. A combination of flexible least square algorithm and adaptive Kalman filtering method are implemented to learn and predict system behavior. The experimental results show that the proposed model and algorithms can efficiently identify faulty components, reduce noise errors injected by sensors/system and thus providing self healing. The Virtual Machine Model (VMM) architecture described in this paper has proved to have several advantages over traditional models;the proposed model allows easy application provisioning, upgrades and maintenance;it provides fault tolerance, speedy disaster recovery and high availability platform.

关键词： Control system Kalman filter least square algorithm control systems Kalman filters least squares algorithm virtual machines high availability system failures machine model Sensors Self tuning system behavior Noise measurement

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Multi-sensor poly information fusion technology and its application

Multi-sensor poly information fusion technology and its appl...

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International Conference on Sensor Technology (ISTC 2001)

作者： Yang, XR Luo, G Guo, Y Ling, YH Cent S Univ Sci Coll Informat & Engineer Changsha 410083 Peoples R China

ISBN: (纸本)0819441198

Radio frequency capacitance sensor is usually used in the intelligent inspection of the water-content in oil product. This method depends on the great difference between the water dielectric constant and oil. The dielectric constant of water is so much bigger than that of the oil that the radio frequency showed by them is much different. In the process of the inspection, we found that the output of the sensor is determined by one parameter and furthermore the output date of the whole system is also changed when the temperature of environment is changed. That is to say the system has certain cross sensitivity about the environment and it can also affect the function of the whole system and measurement precision. In order to improve the measurement precision and maintain the temperature stability of the system we use poly information fusion technology to make a further inspection about the temperature and the moisture voltage. After the fusion process, the sensor can put out the information in any form of temperature, water-content, temperature voltage or water-content voltage, of which you want to choose depends on what fitting equation you want to take. There are a lot of methods in the bisensor fusion. We used two of them: curved surface fitting and neural network. We examined the sensor by lubricant oil and the result showed that the sensor's zero temperature coefficient, sensitivity temperature coefficient, temperature stability and measurement precision is much more accurate than those before the fusion technology is not used. The use of information fusion technology in the water-content inspect system of oil product can greatly improve the distinguish ability of and the speed to get a highly accurate measurement result.

关键词： water-content measurements dielectric constant radio frequency sensor data processing least square algorithm curved surface fitting information fusion Neural Network cross sensitivity measurement precision

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Study of Methods for Determining the Thickness of Safe Roof in Open casting turn to Underground Mining

Study of Methods for Determining the Thickness of Safe Roof ...

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3rd International Conference on Green Power, Materials and Manufacturing Technology and Applications

作者： Chang Juan Zhang Jianhua Zhang Dianji Liu Zhigang Wuhan Univ Technol Sch Resources & Environm Engn Wuhan 430070 Peoples R China Wuhan Inst Technol Sch Environm & Civil Engn Wuhan 430073 Peoples R China Henan Polytech Univ Key Lab Mine Informatizat Jiaozuo 454000 Peoples R China

ISBN: (纸本)9783037859865

Aiming at the problem of determining the interlayer thickness from open- casting to underground mining and based on a practical situation of a mining, the safety thickness was determined by using the Thickness and cross-ratio method, Structural mechanics simplified beam method, Protodyakonov's theory and K. B. Lu peiniet theory, According to the least square algorithm and achievement by MATLAB to determine the best weights of safe thickness.

关键词： Open Casting Underground Mining Safety Interlayer Thickness least square algorithm

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Application of Coordinate Conversion in the Tunnel Through

Application of Coordinate Conversion in the Tunnel Through

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International Conference on Civil, Architectural and Hydraulic Engineering (ICCAHE 2012)

作者： Qi, Xiudong Wang, Zhongyi Henan Polytech Univ Sch Surveying & Land Informat Engn Jiaozuo Peoples R China China Railway Construct Engn Co Ltd Bur Grp 15 Luoyang Peoples R China

ISBN: (纸本)9783037854846

The transformation between different coordinate systems is a technical issue in the process of surveying and mapping. Guangzhou-Shenzhen-Hong Kong Passenger ZH-4 contract Huanggang tunnel passes Shenzhen and Hong Kong. Its coordinates belong to different coordinate systems. In order to ensure the tunnel through quality, coordinate conversion accuracy perpendicular to the direction of tunnel axis should be main consideration when coordinate transformation. According to the characteristics of the tunnel project, using four-parameter model and the least square method. Through composing different public control point, and comparing the tunnel through the point and the cut-off point the projection length of conversion residuals on the important through direction, the optimal transformation parameters have been selected.

关键词： Coordinate transformation Tunnel through least square algorithm

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