检索结果-南通市图书馆

An Improved Approach to the Performance of Remote Photoplethysmography

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

computers, Materials & Continua 2022年第11期73卷 2773-2783页

作者： Yi Sheng Wu Zeng Qiuyu Hu Weihua Ou Yuxuan Xie Jie Li school of Electrical and Electronic engineering Wuhan Polytechnic UniversityWuhan430000China school of Electronic and Information engineering Guizhou Normal UniversityGuizhou550000China gina cody school of engineering and computer science Concordia UniversityW.MontrealQuebecH3G1M8Canada

Heart rate is an important metric for determining physical and mental *** recent years,remote photoplethysmography(rPPG)has been widely used in characterizing physiological signals in human ***,research on non-contact detection of heart rate mainly focuses on the capture and separation of spectral signals from video ***,this method is very sensitive to the movement of the test subject and light intensity variation,and this results in motion artifacts which presents challenges in extracting accurate physiological signals such as heart *** this paper,an improved method for rPPG signal preprocessing is *** on the well known red green blue(RGB)color space,we segmented skin tone in different color spaces and extracted rPPG signals,after which we use a skin segmentation training model based on the luminance component,the blue-difference chroma components,and red-difference chroma components(YCbCr),as well as hue saturation intensity(HSI)color *** the experimental verification section,we compare the robustness of the signal on different color *** summary,we are experimentally verifying a better image pre-processing method based on real-time rPPG,which results in more precise measurements through the comparative analysis of skin segmentation and signal quality.

关键词： Remote photoplethysmography skin segmentation heart rate

A methodology for laser tool setters calibration and its precise mathematical model

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal of Aeronautics 2024年第7期37卷 564-581页

作者： Tao FANG Zixi FANG Ze Zhong CHEN Zhiyong CHANG school of Mechanical engineering Northwestern Polytechnical UniversityXi’an 710072China gina cody school of engineering and computer science Concordia UniversityMontrealQuebec H3G 1M8Canada Changsha Optimum CNC Corporation Changsha 410221China Institute for Aero-engine Smart Assembly of Shaanxi Province Xi’an 710072China

On-machine tool setting is a pivotal approach in achieving intelligent manufacturing,and laser tool setters have become a crucial component of smart machine *** tool setters play a crucial role in precisely measuring the dimensions of cutting tools during the part machining process,focusing on tool length and *** a measuring instrument,the positions of the laser axis of the laser tool setter need to be accurately calibrated before ***,in actual calibration scenarios,traditional calibration methods face challenges due to installation errors in the tool setter and geometric errors in the measuring *** address this issue,this study proposes a novel calibration ***,the calibration mechanism of the laser beam axis is *** on the accurate mathematical model of the laser beam and the measuring rod,and using the polygon clipping algorithm,the mathematical mechanism of the laser tool setter’s work is ***,a novel method is introduced to calculate the compensation distance between the laser beam reference point and the rod bottom center point at each moment during ***,by utilizing the kinematic chain of the tool setter calibration system,a new calibration method is developed to accurately calibrate the position of the laser beam axis in the machine tool coordinate ***,the accuracy of the calibration method is verified through simulation experiments and calibration *** method improves the calibration accuracy of the tool setter,and the mathematical model of the laser tool setter can be extended to the measurement of tools,thereby improving the precision of tool *** research significantly improves the efficient production performance of smart machine tools.

关键词： On-machine tool setting Smart machine tools Mathematical model Calibration method Laser tool sette

维普期刊数据库

TiO_(2)-based photocatalysts for CO_(2) reduction and solar fuel generation

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Catalysis 2022年第10期43卷 2500-2529页

作者： Tao Zhang Xiaochi Han Nhat Truong Nguyen Lei Yang Xuemei Zhou school of Chemical engineering Sichuan UniversityChengdu 610065SichuanChina Department of Chemical and Materials engineering Gina Cody School of Engineering and Computer ScienceConcordia UniversityMontrealQC H3G 2W1Canada

Solar-driven CO_(2) reduction is an efficient way to convert sustainable solar energy and massive CO_(2) to renewable solar fuels,such as CH_(4),HCOOH,HCHO,and CH_(3)OH,*** to now,significant research efforts have been devoted to exploring the reaction path and developing the *** heterogeneous photocatalysis,among the semiconductor-based photocatalysts,titania(TiO_(2)),as an inexpensive and practically sustainable metal oxides,remains the most extensively studied photocatalyst over the past *** this review,we summarize the most recent advances in the solar-driven CO_(2) reduction using TiO_(2)-based photocatalysts,which include the fabrication of heterojunction,surface functional modification,band structure engineering,and morphology design,aiming to improve the CO_(2) conversion efficiency and selectivity to the desired ***,photoelectrochemical and photothermal approaches are introduced and the fundamental principles to activate and enhance the performance of TiO_(2) for the specific reaction are *** exploration of the solar-driven approaches and discussion on the underlying mechanism allow the comprehensive understanding of CO_(2) photoreduction,that can lead to a rational design and synthesis of TiO_(2)-based photocatalysts.

关键词： TiO_(2) Heterogeneous catalysis CO_(2)reduction Solar fuel

维普期刊数据库

PI-funnel and inverse hysteresis compensation cascade control of smart soft dielectric elastomer actuator

在线全文

学校读者我要写书评

暂无评论

Control Theory and Technology 2024年第4期22卷 552-567页

作者： Peng Huang Yawu Wang Yue Zhang Jundong Wu Chun-Yi Su school of Automation China University of GeosciencesWuhan430074HubeiChina Hubei Key Laboratory of Advanced Control and Intelligent Automation for Complex Systems Wuhan430074HubeiChina engineering Research Center of Intelligent Technology for Geo-Exploration Ministry of EducationWuhan430074HubeiChina gina cody school of engineering and computer science Concordia UniversityMontrealQCH3G 1M8Canada

Smart soft dielectric elastomer actuators(SSDEAs)possess wide applications in soft robotics due to their properties similar to natural muscles,including large deformation ratio,high energy density,and fast response ***,the complicated asymmetric and rate-dependent hysteresis property,creep property and quadratic input property of the SSDEA pose enormous challenges to its dynamic modeling and motion *** this paper,first,we construct the dynamic model of the SSDEA by connecting a square module,a one-sided Prandtl–Ishlinskii(OSPI)model and a linear system in series to describe the above *** key and innovative aspect of the dynamic modeling lies in cascading the square module in series with the OSPI model to construct the asymmetric hysteresis ***,a PI-funnel and inverse hysteresis compensation(PIFIHC)cascade control method of the SSDEA is proposed to actualize its tracking control *** performing the inversion operation on the asymmetric hysteresis model,the inverse hysteresis compensation controller(IHCC)is designed to compensate the asymmetric hysteresis property and quadratic input property of the *** addition,a PI-funnel controller is designed to cascade with the IHCC to construct the PIFIHC cascade controller to obtain a good tracking ***,the stability analysis of the PIFIHC cascade control system of the SSDEA is performed to theoretically prove that the tracking error can be controlled within the performance funnel and the steady-state error converges to ***,several practical tracking control experiments of the SSDEA are conducted,and RRMSEs are less than 2.30%for all *** experimental results indicate the effectiveness and feasibility of the proposed PIFIHC cascade control method of the SSDEA.

关键词： Smart soft dielectric elastomer actuator Dynamic modeling Inverse hysteresis compensation controller PI-funnel controller Cascade controller

Sensorless Multi-Parameter Identification for IPMSM Based on High-Frequency Recursive Least Squares Method

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Sensorless Multi-Parameter Identification for IPMSM Based on...

Motion Analysis and Modeling of Pneumatic Bellows Robotic Arm

第32届中国过程控制会议(CPCC2021)

作者： Jin Li Youmin Zhang Chaobo Chen Song Gao Han Liu Guo Xie gina cody school of engineering and computer science Concordia University Faculty of Electronic Informatics Xi'an Technological University Faculty of Automation and Information engineering Xi'an University of Technology

In order to improve the performance of internal permanent magnet synchronous motors(IPMSM) servo driving system,four motor key parameters need to be acquired accurately in real time to increase the control ***,in this paper,aiming at using high-frequency recursive least squares(HF-RLS) algorithm to identify the IPMSM parameters like Ld,Lq,Rs and *** algorithm introduces the current rate of change in the dynamic identification process,and at the same time improves the gain matrix K in the algorithm to reduce the coupling effect of the d-axis and q-axis identification errors on the inductance *** identification parameters are applied to sensorless control and torque observation for *** results show that the HF-RLS identification optimization strategy considering the periodic disturbance of the voltage source can identify the internal multi-parameter of the motor more accurately without obtaining any relevant parameters of the motor.

关键词： IPMSM Recursive least squares(RLS) Multi-parameter identification High-frequency speed estimation

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Motion Analysis and Modeling of Pneumatic Bellows Robotic Ar...

Modeling the dynamic deformation process of light-responsive liquid crystal elastomer actuator

第43届中国控制会议

作者： Shu Luo Jundong Wu Huai Xiao Chun-Yi Su Daiki Sato Jinhua She engineering Research Center of Intelligent Technology for Geo-Exploration Ministry of Education Laboratory for Future Interdisciplinary Research of science and Technology (FIRST) Tokyo Institute of Technology gina cody school of engineering and computer science Concordia University The school of engineering Tokyo University of Technology

Pneumatic soft robots are increasingly valued for their lightweight, flexibility and adaptability to complex environments. Among various structures, pneumatic soft robotic arm is widely used in the fields of medical rehabilitation,complex terrain exploration, and service industry, etc., making it a popular form of pneumatic soft robots. In practical applications, precise control of soft robotic arms is very important, which requires a complete understanding of their motion patterns and corresponding modelling. However, due to their nonlinearity, the motion patterns of soft robotic arms are complex,which makes the motion analysis and modeling of the soft robotic arm a challenging topic. Based on the above considerations,this paper analyzes the motion of a pneumatic soft robotic arm and develops a prediction model for its input-output characteristics. First, we introduce the basic structure and experimental platform of a pneumatic soft robotic arm, after that, we analyze its performances including spatial reach, response time and bending angle, and designed an application experiment based on the results of the analysis. In the end, we use BP neural network to establish a model of the input air pressure and the end coordinates, and the accuracy of the model was verified through experiments.

关键词： Soft robot Pneumatic bellows robotic arm Motion analysis Neural network

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Modeling the dynamic deformation process of light-responsive...

第43届中国控制会议

作者： Junyu Xue Jundong Wu Qingxin Meng Yawu Wang Chun-Yi Su Daiki Sato Jinhua She school of Automation China University of Geosciences engineering Research Center of Intelligent Technology for Geo-Exploration Ministry of Education Laboratory for Future Interdisciplinary Research of science and Technology (FIRST) Tokyo Institute of Technology gina cody school of engineering and computer science Concordia University The school of engineering Tokyo University of Technology

Light-responsive liquid crystal elastomer actuators(LCEAs) enables novel remote-controlled soft robot actuation,bringing new possibilities to the application of soft ***,these actuators have complicated dynamic characteristics,and a dynamic model that can describe the deformation process of LCEAs is needed to predict and control their *** on the above consideration,this paper proposes a model to describe the dynamic deformation process of light-responsive *** proposed model consists of two parts:a dynamic temperature model and a dynamic deformation *** order to verify the proposed model,we establish a light-responsive LCEA experimental platform and perform LCEA deformation *** parameters of the model are identified by the nonlinear least squares *** experimental results show that the proposed model can characterize the dynamic deformation process of LCEAs with precision.

关键词： Liquid crystal elastomer actuator dynamic modeling hysteresis Prandtl-Ishlinskii model

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

操作系统与Oracle内存管理比较

现代计算机 2021年第19期27卷 152-154,169页

作者：王润中 gina Code school of engineering and computer science Concordia UniversityCanada

操作系统与Oracle都是重要的系统软件,通过对各自内存和进程管理方式的陈述以及对它们重要特性的比较,指出Oracle给出了清晰的内存与进程的功能视图,便于程序员编写代码;其次Oracle将用户的请求分解为公有和私有部分,且高占比的共享区域... 详细信息

操作系统与Oracle都是重要的系统软件,通过对各自内存和进程管理方式的陈述以及对它们重要特性的比较,指出Oracle给出了清晰的内存与进程的功能视图,便于程序员编写代码;其次Oracle将用户的请求分解为公有和私有部分,且高占比的共享区域,提高了内存在网络环境下的使用效率;第三,Oracle的智能化内存管理使得SGA中的各个组件的内存分配达到最优。最后,操作系统将Oracle的整个SGA直接映射为其虚拟内存,这种类似联邦式的自治管理方式值得借鉴。

关键词：操作系统 Oracle 内存管理进程管理

维普期刊数据库

SQL Server在线交互实验学习系统设计方法

在线全文

学校读者我要写书评

暂无评论

数字技术与应用 2022年第1期40卷 143-145页

作者：王文娟王润中广州南洋理工职业学院信息工程学院 gina Code school of engineering and computer science Concordia University

为了培养学生在线学习和提高对真实软件的使用能力,减少教师批改实验报告的工作量,建设一个高质量的在线实验和自动批改学习系统是十分必要的。本文以远程学习“教学交互层次塔”为理论核心,提出了SQL Server的分层、渐进、交互、细粒... 详细信息

为了培养学生在线学习和提高对真实软件的使用能力,减少教师批改实验报告的工作量,建设一个高质量的在线实验和自动批改学习系统是十分必要的。本文以远程学习“教学交互层次塔”为理论核心,提出了SQL Server的分层、渐进、交互、细粒度实验教学内容的设计方法,逐步形成了B端学习,C端操作实际软件,S端批改并反馈批改信息的新型远程实验教学模式。案例实践结果表明,采用该方法进行的实验能够基本满足学生交互实验学习的需要。

关键词：远程学习在线学习远程实验教学在线实验自动批改实验报告学习系统设计在线交互

维普期刊数据库博看期刊