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4th International Conference on High Performance Compilation, Computing and Communications (HP3C)

作者： Pan, Xinhong Luo, Xin Zhang, Zhihai Lin, Heyun Dong, Jingyi Guangxi Power Grid Dispatching Control Ctr Nanning Peoples R China Commun Univ China Sch Informat & Commun Engn Beijing Peoples R China

ISBN: (纸本)9781450376914

For multi-user multiple-input multiple-output (MIMO) Relay System, this paper develops a joint signal detection and channel estimation method based on Tucker-2 model. First, the proposed method encodes the transmitted information symbols at the source and transmits them to the relay. Then, the relay amplifies the received signals and broadcasts them to all users. Last, the Tucker-2 model is constructed and the iterative fitting algorithm is designed at the user end to realize the joint estimation of signals and channels. Theoretical analysis and simulation results show that the proposed method can effectively detect the information symbols and estimate the channel matrix when channel state information (CSI) is unknown and pilot signal is not used. In addition, compared with the existing algorithms, the proposed method has higher estimation performance and more relaxed application conditions.

关键词： Multi-user MIMO Relay tucker-2 fitting algorithm CSI

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Sensitivity Analysis and Classification algorithms Comparison for Underground Target Detection

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IEEE ACCESS 2019年 7卷 116227-116246页

作者： Duan, Shihong Li, Yue Wan, Yadong Wang, Peng Wang, Zhen Li, Na Univ Sci & Technol Beijing Sch Comp & Commun Engn Beijing 100083 Peoples R China Sunkaisens Beijing Technol Ltd Beijing 100071 Peoples R China Univ Sci & Technol Beijing Sch Math & Phys Beijing 100083 Peoples R China

Underground target detection technology has been widely used in urban construction and resource exploration. With the development of industrial modernization, the demand for underground target detection is becoming more specific, such as the material and shape of underground targets. Therefore, it is necessary to classify the properties of underground targets. In this paper, sensitivity analysis was performed on the spheroid model and the approximate forward model at first, and the influence of the target properties on the model output is obtained. Secondly, we utilized the fitting algorithm to obtain the model parameters of the simulation data (model response of targets with varying shapes and materials), and analyzed the influence of the fitting algorithm on the classification results at different SNR. Finally, eight machine learning algorithms: support vector machine (SVM), neural network (NN), quadratic discriminant analysis (QDA), Gaussian process (GP), decision tree (DT), random forest (RF) and AdaBoost were used in this study to compare the obtained results. From the above analysis, we found that the shape (radius) have a greater influence on the model than the material (permeability) in the spheroid model. According to the approximate forward model, we found that it is not feasible to classify targets when the orientation is unknown. The influence of the fitting algorithm on the classification performances is related to the noise level. The obtained results using neural network demonstrated that the proposed method outperformed in material-based classification and shape-based classification. In the material-based classification, the classifier generally has a weaker ability to distinguish between permeable materials.

关键词： Underground target detection sensitivity analysis fitting algorithm machine learning classification algorithms comparison

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P-4.2: An Image Pre-distortion algorithm for Near-eye Display

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SID Symposium Digest of Technical Papers 2023年第S1期54卷

作者： Huang Xiaobo Yan Limin School of Mechatronic Engineering and Automation Shanghai University Shanghai China Microelectronics Research and Development Center Shanghai University Shanghai China

With the development of near-eye display technology, optical distortion is often introduced into the design of near-eye optical system to meet people's requirements for high definition and large field of view. However, the larger the field of view, the greater the distortion of the projected image. In order to correct distorted images, this paper proposes an image pre-distortion algorithm based on nonlinear fitting and forward mapping interpolation. The radial basis function fitting algorithm is used to get a more precise mapping relationship between the original image and the pre-distorted image. The compactly supported radial basis function ( CSRBF ) interpolation algorithm based on forward mapping is used for image gray reconstruction to obtain better correction effect of image distortion. The experimental results show that the fitting error of the radial basis function fitting algorithm can be reduced to less than 1 pixel, reaching sub-pixel level. The pre-distortion algorithm has a good correction effect on the non-rotational symmetry distortion produced by the near-eye optical system, which makes the display image clear and complete.

关键词： Near-eye display Image pre-distortion fitting algorithm Interpolation algorithm

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Development of a hybrid system for automatic identification of brushed direct current motors

Development of a hybrid system for automatic identification ...

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IEEE International Congress on Electronics, Electrical Engineering and Computing (INTERCON)

作者： Franz Hamann Gustavo Mesones Electronics engineering faculty Universidad Peruana de Ciencias Aplicadas Lima Perú

ISBN: (数字)9781728193779

ISBN: (纸本)9781728193786

This work proposes a low-cost hybrid hardware and software system that, through a set of methods and nested while loop fitting algorithms, allows to automatically identify the electrical and mechanical parameters of a brushed direct current motor. The aim is to facilitate a tool that contributes to the development of motion control projects in which this type of actuator is used, automating and speeding up the identification process of the motor system aiming to reach 98% accuracy, in order to guarantee a good electrical and mechanical parameter estimates for the brushed direct current motor. To achieve the objective, a platform was developed consisting of a main interface programmed in Matlab and a data acquisition hardware based on a single-phase incremental optical encoder, an H-bridge, an optocoupler circuit, and a C language-programmed DSPIC30F2010. Both parts of the platform are interconnected through the authors' own serial communication protocol.

关键词： Hybrid system fitting algorithm motion control brushed direct current motor identification automatic DC motor parameters DC motors hybrid systems Motor Control AUTOMATIC Automatic identification Brushed main interface Data Collection Methods mechanical parameter

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Automated Macro Approach to Remove Vitelline Membrane Autofluorescence in

Automated Macro Approach to Remove Vitelline Membrane Autofl...

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作者： Jaume Boix-Fabrés Katerina Karkali Enrique Martín-Blanco Elena Rebollo

This chapter provides an ImageJ/Fiji automated macro approach to remove the vitelline membrane autofluorescence in live Drosophila embryo movies acquired in a 4D (3D plus time) fashion. The procedure consists in a segmentation pipeline that can cope with different relative intensities of the vitelline membrane autofluorescence, followed by a developed algorithm that adjusts the extracted outline selection to the shape deformations that naturally occur during Drosophila embryo development. Finally, the fitted selection is used to clear the external glowing halo that, otherwise, would obscure the visualization of the internal embryo labeling upon projection or 3D rendering. less

关键词： Live Cell Imaging ImageJ Fiji Drosophila Autofluorescence Vitelline membrane Membrane segmentation 3D projection fitting algorithm

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The measurement techniques for angular 3-D pinholes based on capacitive probe

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MEASUREMENT 2017年 97卷 145-148页

作者： Ma Yu-Zhen Ma Ling Zheng Yi-Zhong Univ Jinan Sch Mech Engn Jinan 250022 Peoples R China Tianjin Univ State Key Lab Measurement Technol & Instruments Tianjin 300072 Peoples R China

Based on the measurement progress of straight through pinholes, the measuring for angular is challenging because the probe is inconvenient to stretch into the pinhole exactly. In the paper, an adjustable five dimensional system, which is mainly composed of a three-coordinate measuring machine (CMM), a turntable, a visual sensor and a capacitive probe, is employed to accomplish the measurement for a circular workpiece with angular multi-pinholes. The CMM traces the coordinates while the capacitive probe moves, a precise turntable turns the workpiece at desired angle to guarantee the pinhole and the probe in the same orientation. A binocular visual sensor and a capacitive probe is for alignment and measuring, respectively. A comprehensive algorithm of combining projection and the least-squares fitting is put forward for fitting spatial axis equation of 3-D pinholes. Finally, a reliable and entire measurement system is set up and the optimal equation of the spatial axis is obtained. (C) 2016 Elsevier Ltd. All rights reserved.

关键词： Angular 3-D pinholes Capacitive probe Three-dimensional coordinates Axis fitting algorithm Circular workpiece

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Measurement of Tank Cooling Airflow Based on Array Sensors

Measurement of Tank Cooling Airflow Based on Array Sensors

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International Conference on Fluid Mechanics and Industrial Applications (FMIA)

作者： Zhou, Hui Han, Yan Wang, Jianguo Zhang, Pizhuang North Univ China Sch Informat & Commun Engn Taiyuan 030051 Shanxi Peoples R China North Automat Control Technol Inst Taiyuan 030006 Shanxi Peoples R China

Researching on the cooling airflow characters of tank will be helpful for optimizing the design of cooling system, and will be of great importance to improve the performance of armoured vehicles. According to the test requirements of tank under the actual working conditions, we studied and designed the proposed cooling airflow measurement system. The most important thing was that we finished the assembly of array sensors without any damage to tank. In addition, according to national standard we set the quantity and locations of the sensors, which was on the premise of avoiding the influence to airway. In this paper, there was description of cooling airflow signal processing;and there was analysis of air pressure distribution which was presented simultaneously by three-dimensional surface graph and plane graph at the exhaust port of tank engine compartment according to fitting algorithm.

关键词： Tank Cooling Airflow Array Sensors Assembly Signal Processing fitting algorithm Air Pressure Distribution

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A Modular Control Scheme for Hyper-redundant Robots

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INTERNATIONAL JOURNAL OF ADVANCED ROBOTIC SYSTEMS 2015年第7期12卷 91-91页

作者： Cho, Chang Nho Jung, Hyunchul Son, Jaebum Kim, Kwang Gi Natl Canc Ctr Goyang Gyeonggi Do South Korea

Hyper-redundant robots, robots with many degrees of freedom, are considered to be advantageous in many tasks, such as minimally invasive surgery, surveillance and inspection. However, due to their hyper degrees of freedom, the control of hyper-redundant robots is always challenging. Several fitting algorithms, which iteratively fit a hyper-redundant robot into a continuous curve, have been proposed to control the configuration of hyper-redundant robots. However, these algorithms require heavy computation, preventing them from being used in practice. In this study, we propose a novel modular control scheme for a hyper-redundant robot to reduce the computational load by dividing the robot into smaller modules and fitting each module separately. A Jacobian-based position control algorithm is also used to utilize the redundancy of each module to ensure that the overall configuration of the robot resembles the given desired curve. Simulation results show that the proposed scheme can be used to control hyper-redundant robots effectively.

关键词： fitting algorithm Hyper-Redundant Robot Redundancy Resolution Weight Least Norm

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Quadrilateral mesh fitting that preserves sharp features based on multi-normals for Laplacian energy

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JOURNAL OF COMPUTATIONAL DESIGN AND ENGINEERING 2014年第2期1卷 88-95页

作者： Imai, Yusuke Hiraoka, Hiroyuki Kawaharada, Hiroshi Chuo Univ Dept Precis Mech Bunkyo Ku 1-13-27 Kasuga Tokyo 1128551 Japan

Because the cost of performance testing using actual products is expensive, manufacturers use lower-cost computer-aided design simulations for this function. In this paper, we propose using hexahedral meshes, which are more accurate than tetrahedral meshes, for finite element analysis. We propose automatic hexahedral mesh generation with sharp features to precisely represent the corresponding features of a target shape. Our hexahedral mesh is generated using a voxel-based algorithm. In our previous works, we fit the surface of the voxels to the target surface using Laplacian energy minimization. We used normal vectors in the fitting to preserve sharp features. However, this method could not represent concave sharp features precisely. In this proposal, we improve our previous Laplacian energy minimization by adding a term that depends on multi-normal vectors instead of using normal vectors. Furthermore, we accentuate a convex/concave surface subset to represent concave sharp features.

关键词： CAD model Hexahedral mesh Sharp feature fitting algorithm Multi-normalvectors

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Ocean Wind Speed Retrieved from X-Band Radar Image

Ocean Wind Speed Retrieved from X-Band Radar Image

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2015 International Conference on Automation,Mechanical Control and Computational Engineering(AMCCE 2015)

作者： Meng Xu Xiao-liang Chu Jian Wang Ye-hui Wang Kai-jin Wei Tao Zhou College of Information and Engineering Ocean University of China First Institute of Oceanography State Oceanic Administration

ISBN: (纸本)9781510803084

A method for wind speed retrieval is developed by applying fitting techniques with the ratio of signal to noise. The method is applied to the wind speed retrieval from the nautical radar images. And we get a correlation coefficient of 0.88 and RMS error of 1.34m/s by comparing the data from the radar and in-situ data. The results show that this method can be used to estimate the wind speed.

关键词： X-band radar wind speed fitting algorithm

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