An Analysis Model of Sports Human Body Based on Computer Vision Tracking Technology

This paper proposes the analysis model of sports human body based on computer vision tracking technology. Visual target tracking is an important research field of the computer vision, motion trajectory and it can provide not only the goal, to provide the initial data movement analysis, scene understanding, behavior or the event detection in intelligent surveillance, human-computer interaction, robot visual navigation and motion recognition based on field has a broad application prospect. For this reason, it is possible to consider the use of a large number of unlabeled samples to assist the training classifier to improve its performance. This type of machine learning method using both labeled and that unlabeled samples is called the semi-supervised learning. This paper proposes the novel idea of the related research topics to propose the new perspective of the model that will be later give us the novel idea of making it efficient for further development of sport science.

Navigation technology/eye-tracking in ophthalmology:principles,applications and benefits-a narrative review

Navigation technology in ophthalmology,colloquially called“eye-tracking”,has been applied to various areas of eye care.This approach encompasses motion-based navigation technology in both ophthalmic imaging and treatment.For instance,modern imaging instruments use a real-time eye-tracking system,which helps to reduce motion artefacts and increase signal-to-noise ratio in imaging acquisition such as optical coherence tomography(OCT),microperimetry,and fluorescence and color imaging.Navigation in ophthalmic surgery has been firstly applied in laser vision corrective surgery and spread to involve navigated retinal photocoagulation,and positioning guidance of intraocular lenses(IOL)during cataract surgery.It has emerged as one of the most reliable representatives of technology as it continues to transform surgical interventions into safer,more standardized,and more predictable procedures with better outcomes.Eye-tracking is essential in refractive surgery with excimer laser ablation.Using this technology for cataract surgery in patients with high preoperative astigmatism has produced better therapeutic outcomes.Navigated retinal laser has proven to be safer and more accurate compared to the use of conventional slit lamp lasers.Eye-tracking has also been used in imaging diagnostics,where it is essential for proper alignment of captured zones of interest and accurate follow-up imaging.This technology is not routinely discussed in the ophthalmic literature even though it has been truly impactful in our clinical practice and represents a small revolution in ophthalmology.

Application and Analysis of Advanced Manufacturing Technology in Track Equipment Manufacturing Industry

With the rapid development of global transportation track equipment, the running speed of modern rail transit equipment keeps refreshing records. High-speed EMUs, inter-city EMUs and urban rail vehicles have become the main types of domestic passenger transport vehicles, especially the lightweight production and manufacture of high-speed EMUs and urban rail vehicles, which are the main topics of railway transport modernization research and discussion. Track manufacturing is a successful example of China's industrial transformation and strategic restructuring through systematic innovation since the reform and opening up. In this paper, the application of some advanced manufacturing technologies in the track equipment manufacturing industry and the opportunities and challenges faced by the whole track equipment manufacturing industry were mainly studied, hoping to provide some help for the development of the track equipment manufacturing industry in China.

Development Track of Renewable Power Technology in China

Introduction Within the context of deeper global energy shortage and increasingly more polluted environment,countries throughout the world have been actively developing renewable energy sources to replace the fossil fuel,

运用E-Tracking技术检测酒精性肝病患者戒酒治疗前后颈动脉弹性变化的研究

目的运用E-Tracking技术检测酒精性肝病(ALD)患者戒酒治疗前后颈动脉弹性的变化。方法 ALD患者137例,戒酒组31例,戒酒失败组106例,常规颈动脉超声获取治疗前后IMT、D、RI、PI、S/D几项指标,运用E-Tracking技术获取治疗前后Ep、β、AC、AI、PWVβ指标。比较两组治疗前后常规超声指标及E-Tracking指标;比较戒酒组中,不同程度肝损伤的各类在戒酒治疗前后E-Tracking指标。结果戒酒组与戒酒失败组治疗前后常规超声指标无明显差异,戒酒组治疗后Ep、β、PWVβ治疗前减低,AC增高,差异有统计学意义(P<0.05或P<0.01),戒酒失败组各项参数差异无统计学意义;戒酒组中,酒精性脂肪肝(AFL)及酒精性肝炎(AH)患者E-Tracking指标较酒精性肝硬化(AC)患者变化显著。结论 ALD患者戒酒治疗后颈动脉硬度、弹性减低、顺应性增高、扩张性降低,尤以酒精性脂肪肝及酒精性肝炎患者更为明显,E-Tracking技术能准确定量评价颈动脉弹性,为临床评价ALD治疗效果提供了一种新的方法。

A new tracking error detection method using amplitude difference detection for signal waveform modulation multi-level discs

The sub-land/sub-pit affects the characteristic of the tracking error signal which is generated by the conventional differential phase detection （DPD） method in the signal waveform modulation multi-level （SWML） read-only disc. To solve this problem, this paper proposes a new tracking error detection method using amplitude difference. Based on the diffraction theory, the amplitude difference is proportional to the tracking error and is feasible to be used for obtaining the off-track information. The experimental system of the amplitude difference detection method is developed. The experimental results show that the tracking error signal derived from the new method has better performance in uniformity and signal-to-noise ratio than that derived from the conventional DPD method in the SWML read-only disc.

应用E—Tracking技术评价代谢综合征患者颈动脉血管内皮功能

目的:探讨E—Tracking技术对代谢综合征患者早期血管内皮功能改变的评价价值。方法:对60例代谢综合征(MS)患者和60例正常人采用E-Tracking技术实时跟踪描记颈总动脉管壁运动轨迹,得出颈总动脉的收缩期内径(Ds)、舒张期内径(Dd)、弹性系数(Eρ)、硬化值(β)和其顺应性(AC),并将代谢综合征组各项指标与对照组比较。结果:代谢综合征组颈总动脉的Eρ及β值分别为(209.75±96.43)及(15.41±7.92),与正常对照组(96.15±30.23)及(7.90±2.64)比较,差异具有统计学意义(P<0.01);AC:MS组显著低于对照组(P<0.01);Ds、Dd两组比较,差异无统计学意义(P>0.05)。结论:应用E—Tracking技术能尽早反映代谢综合征患者血管的改变,是评价血管内皮功能简便实用的方法。

E-Tracking技术定量评价围绝经期妇女颈动脉弹性的研究

目的应用血管回声跟踪(E-tracking)技术对围绝经期妇女的早期颈动脉硬化特征进行研究。方法围绝经期雌二醇下降组38例,围绝经期雌二醇正常组32例,应用E-tracking技术对颈动脉血流动力学进行量化分析来评估动脉硬化参数,包括弹性模量(Eρ)、僵硬度(β)、顺应性(AC)。结果雌二醇下降组Eρ、β与正常对照组相比较明显增高,AC与正常对照组相比明显减小。在雌二醇下降组中,分别将雌二醇与Eρ、β、AC进行直线相关分析。结果发现,雌二醇与Eρ、β呈负相关(r=-0.707;r=-0.689),而与AC呈正相关(r=0.644)。结论 E-tracking技术能够判断围绝经期妇女早期动脉硬化,具有简便、快速、无创、测量结果精确的优点。

The optimization method of industrial robot arm structure based on green manufacturing technology

In order to realize the optimal design of the industrial robot arm structure,an optimization method of the industrial robot arm structure based on green manufacturing technology is proposed.The stability of arm structure parameter acquisition can be controlled.The quantitative adjustment model of structural optimization parameters is constructed.The differential fusion control of the arm structure is realized.This paper analyzes the structure parameter law of the robot arm.We use dynamic parameter prediction and output torque parameter compensation method to control the arm structure.According to the adaptive iterative processing results,the arm structure parameter identification is realized.According to the identification results,the cutting parameter optimization method is adopted for the analytical control of the arm structure,and finally the optimized design of the industrial robot arm structure is realized through the green manufacturing technology.The simulation test results show that for the accuracy of the industrial robot arm structure design,this method is better,the output stability is higher,and the arm motion trajectory has a low deviation from the actual motion trajectory,which improves the optimization control and design capabilities of the industrial robot arm structure.

Research on Airborne Electro-Optical Tracking and Sighting System Based on Fuzzy PID and H_∞ Control

Airborne electro-optical tracking and sighting system is a three-degree-of-freedom angular position servo system which is influenced by multi-disturbance,and its control system consists of stabilizing and tracking components.Stabilizing control is applied to track angular velocity order and control multi-disturbance under airborne condition,and its robustness should be very good;tracking control is applied to compensate tracking error of angular position.A mathematical model is established by taking the control of yaw loop as example.H∞ stabilizing controller is designed by taking the advantage of H∞ control robustness and combining with Kalman filter.A fuzzy control is introduced in general PID control to design a decoupled fuzzy Smith estimating PID controller for tracking control.Simulation research shows that the control effect of airborne electro-optical tracking and sighting system based on fuzzy PID and H∞ control is good,especially when the model parameters change and the multi-disturbance exists,the system capability has little fall,but this system still can effectively track a target.

基于眼动追踪技术的哈尔滨地铁站入口设计造型审美意象研究

城市公共家具是城市便捷生活的助力产品,也是城市文化、城市形象的重要承载传播媒介。本文以哈尔滨地铁站入口为研究对象,采用眼动追踪技术、语义差分法、问卷调查、数据统计相结合的方法对哈尔滨城市公共家具造型审美意象进行定性定量化分析和研究。哈尔滨地铁站入口样本的兴趣区研究数据显示,地铁站入口造型的核心关注区域为站点标识牌、拱形造型、立柱等部位,地铁站入口类型对兴趣区观看时间影响不大,不同造型区域观看时间存在一定差别;哈尔滨城市公共家具会给人带来“厚重”“古典”的感觉。对于哈尔滨城市公共家具造型和审美认知的定量化研究,将模糊意识和主观评价转化为准确的数据化客观表达,为具有城市文化特色的公共家具造型设计创新提供科学参考依据。

在法治轨道上推进新时代科技创新的功能阐释

中国式现代化关键在科技现代化,在法治轨道上推进新时代科技创新是实现科技现代化和法治现代化的必然要求。在法治轨道上推进科技创新旨在发挥法治轨道在推进科技创新中的重要功能,使法治轨道成为驱动和赋能科技创新的重要动力机制和动能来源。要实现在法治轨道上推进科技创新,必须以习近平法治思想为指导,充分发挥和不断优化法治轨道在保障科技创新的政策实施、激发科技创新的主体活力、维护科技创新的自由空间、塑造科技创新的竞争优势、消解科技创新的伦理风险等方面的调整机制功能,从而为新时代科技创新提供持久法治动力和注入强劲法治动能。

64排螺旋CT头颈部血管成像图像质量优化的应用研究

目的 探讨小剂量团注测试技术结合双流注射技术在64排螺旋CT头颈部血管成像(CTA)中的应用价值。方法 选取2019年5月至2023年6月来我院检查的120例头颈部CTA成像患者,随机分为A、B组,每组各60例。A组采用对比剂团注追踪技术,B组采用小剂量团注测试技术联合双流注射技术,两组分别进行头颈部CTA成像,对两组图像质量进行主观、客观评分,并对两组对比剂使用情况进行比较。结果 两组图像大部分都能满足诊断,头颈部较大血管能清楚显示,但B组脑血管边缘分支显示更清楚,脑静脉污染较少,因此两组图像质量主观评分B组高于A组(P<0.05)。两组图像主动脉弓、左颈总动脉分叉部、左颈内动脉虹吸部、左大脑中动脉M1段、左大脑后动脉P1段、左椎动脉起始部的CT值比较,差异无统计学意义(P>0.05);两组图像客观评分,主动脉弓、左颈总动脉分叉处及左大脑中动脉M1段的图像噪声、信噪比(SNR)、对比信噪比(CNR)比较,差异无统计学意义(P>0.05);两组对比剂使用量比较,B组低于A组(P<0.05)。结论 64排螺旋CT头颈部血管成像采用小剂量团注测试技术联合双流注射技术较常规对比剂团注追踪技术更能获得稳定、优良的图像质量,同时对比剂用量显著减少,具有临床推广价值。

基于工程教育专业认证的科创类课程改革实践

科技创新类课程是电类专业本科生培养的重要组成部分。在工程教育专业认证“成果导向教育”理念驱动下,进行了“工程实践与科技创新”系列课程群的教学体系改革与实践。分析现存问题,介绍教学目标确立、课程内容与教学方法设计,通过“太阳能双轴追光系统”案例展示教学成果,总结持续改进经验。教学实践帮助学生增强了工程设计、团队协作以及终身学习的能力,高效激发了学生的科技创新积极性,达到了预期效果,具有一定的推广价值。

地铁车站照度对乘客主观情绪和视觉绩效认知的影响研究

[目的]合理的照明环境对提高地铁车站服务水平、保证乘客疏散安全、促进公共交通可持续发展起着重要作用。为促进地铁车站照明环境设计的科学化和合理化,需研究地铁车站不同照度环境对乘客主观情绪和视觉绩效认知的影响。[方法]采用眼动追踪技术、视觉绩效认知评估技术、三维情绪评估模型相结合的方法,提出了眼动试验评估、视觉绩效认知评估、主观情绪评估3个评估类别共计8个参数的计算方法。设置了试验流程,将照度作为自变量,选取了5个照度水平进行试验研究。构建了不同照度同乘客主观情绪、视觉绩效认知参数之间的关系模型,并对试验结果分别进行了单因素方差分析、相关度分析及综合分析。[结果及结论]照度对乘客主观PAD(愉悦度、唤醒度、控制度)、视觉绩效认知均有显著影响。提高乘客的愉悦度和唤醒度,能够缩短乘客的视觉认知时间。照度在200~230 lx时,乘客的主观情绪、视觉绩效认知水平均达到最优。

油气行业作业人员不安全行为智能预警方法探讨

油气行业涉及领域广,从业人员在作业过程中通常面临复杂的生产工艺、恶劣的工作环境及高强度的工作状态等,油气行业事故发生率常年居高不下,其中人为失误等事故原因所占比例超过70%。实现油气行业作业人员不安全行为的智能预警,对于减少油气行业事故的发生具有重要意义。油气行业作业人员的不安全行为主要包括错误行为与安全隐患行为。针对作业人员的不安全行为识别和预警,目前主要采用人员检查、事后分析及视频监控等方法,但是上述方法分别存在无法实时识别作业人员的错误行为,无法识别和预警作业人员的安全隐患行为等。视线追踪技术是通过捕捉作业人员的注视点与注视时间的变化过程,从而判断作业人员当前工作状态的一项技术。该技术具有反应灵敏、准确度高、无死角与可穿戴等特点,在医疗健康、交通安全、心理学等领域均已有较好的应用。利用视线追踪技术在人员状态监测等方面的优势,将其引入到油气行业作业人员不安全行为的识别或预警方法研究,用以探讨在该领域实现作业人员不安全行为智能预警的可行性。

二维斑点追踪技术评价曲妥珠单抗联合蒽环类药物对乳腺癌患者心脏毒性的价值

目的探讨二维斑点追踪技术早期监测左心室收缩功能评价乳腺癌患者在接受蒽环类药物联合曲妥珠单抗联合治疗后产生心脏毒性的价值。方法乳腺癌术后患者50例,均接受蒽环类药物联合曲妥珠单抗联合治疗,分别于治疗前、治疗中期及治疗后期常规进行心电图、二维超声心动图及二维斑点追踪技术监测,主要观察指标为左心室射血分数(LVEF)及整体纵向应变(GLS),30例健康志愿者作为对照组。结果①GLS在化疗中期及后期时较对照组、化疗前均明显减低(P<0.05)。②LVEF在化疗中期及后期对比化疗前或对照组差异均无显著意义。结论应用二维斑点追踪技术测得的整体纵向应变值(GLS)能评价乳腺癌患者治疗后药物所致的左心室功能障碍的微小变化,尽早发现心肌功能的损害。

基于机器学习与眼动追踪的认知风格模型构建

认知风格反映了学生接近、获取、组织、处理和解释信息的模式,可用来解释和指导学生的行为。将认知风格集成到智能系统中,有助于开发个性化的用户模型,推动智能教育发展。当前有关认知风格自动分类的研究较为匮乏,尚未将机器学习与眼动追踪技术联合起来进行应用。基于机器学习与眼动追踪的认知风格模型,选取注视时长、注视点数量、扫视时长、眼跳次数、眼跳距离与瞳孔直径等6个与认知有着密切关系的眼动指标,归一化处理后借助机器学习算法进行认知风格自动分类。实验结果表明:在进行同样时长的视频学习时,不同场认知风格的学习者表现出不同的视觉行为模式;场依存型学习者注视点较为分散,表现出有较多的扫视行为、较少的注视行为、较长的眼跳距离与较大的瞳孔直径变化,信息搜索效率较低;而场独立型学习者有着较为密集与定向的视觉注意模式,信息搜索效率更高。对5种机器学习算法进行性能对比后发现,逻辑回归算法的分类效果最好,准确率达到89.01%,Kappa值达到0.774。该认知风格自动化分类模型既可用于智能学习系统的课程资源优化设计,也可用于个性化学习路径的推荐。未来可整合更多生理数据,通过不同模态数据之间的信息互补,提升数据分析的准确性以及对学习者认知能力评估的可靠性。

复杂曲面零件的五轴数控加工技术研究

随着科技水平的不断提升,精密复杂曲面零件的应用越来越广泛。曲面驱动是复杂曲面零件加工的重要方法,驱动刀轨的规划直接关系到曲面物理特性的调控,应用五轴数控加工技术能够提升复杂曲面零件的加工质量。文章主要研究复杂曲面零件的五轴数控加工技术,以佛像这个复杂曲面零件为例,分析了曲面驱动刀轨规划、工装方案设计、加工策略以及试制加工过程。在实际加工过程中,技术人员应充分理解驱动刀轨规划思路与原理,在粗加工、精加工中完善刀轨设计,并进行试制加工。

基于滤波技术的激光数控加工误差控制策略

为降低激光数控加工过程中的轨迹跟踪误差,分析了激光数控加工进给伺服系统跟踪误差和等效模型偏差形成的原因,设计了基于滤波技术的激光数控加工误差控制策略,旨在预测激光数控加工轨迹跟踪误差。通过设计的模态滤波控制器进行激光数控加工运动轨迹补偿,从而实现加工误差控制。测试结果表明,该策略能够有效获取激光数控加工轨迹的跟踪误差结果,两种加工模式均可在1 s内完成控制响应;能够有效完成激光数控加工动作补偿,双向加工轨迹跟踪误差结果均在15μm以下。