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Design of handheld terminal for shock wave pressure measurement system
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作者 石晓丹 夏永乐 《Journal of Measurement Science and Instrumentation》 CAS CSCD 2015年第2期169-174,共6页
Considering that it is difficult to monitor the measurement system and amend the test parameters on the scene in shock wave overpressure measurement and it is inconvenient to operate and carry traditional PC in outdoo... Considering that it is difficult to monitor the measurement system and amend the test parameters on the scene in shock wave overpressure measurement and it is inconvenient to operate and carry traditional PC in outdoor experiments, a new handheld terminal for shock wave pressure measurement system based on ARM is designed, The handheld terminal, whose ap- plication program is developed by the software of Qt, can control the measurement system by Wi-Fi and perform the functions of monitoring the system state, transmitting the data by wireless and displaying waveforms. To prevent data loss, USB inter- face is designed to read the data The test results show that the designed handheld terminal has good stability and reliability in several explosion experiments. 展开更多
关键词 shock wave handheld terminal QT
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Screening of unknown atrial fibrillation through handheld device in the elderly 被引量:3
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作者 Francesco Rivezzi Riccardo Vio +8 位作者 Claudio Bilato Leopoldo Pagliani Giampaolo Pasquetto Salvatore Saccà Roberto Verlato Federico Migliore Sabino Iliceto Vito Bossone Emanuele Bertaglia 《Journal of Geriatric Cardiology》 SCIE CAS CSCD 2020年第8期495-501,共7页
Objective To estimate the prevalence of unknown atrial fibrillation(AF)in the elderly population of the Veneto Region,Italy.Methods 1820 patients aged≥65 years with no history of AF and not anticoagulated were enroll... Objective To estimate the prevalence of unknown atrial fibrillation(AF)in the elderly population of the Veneto Region,Italy.Methods 1820 patients aged≥65 years with no history of AF and not anticoagulated were enrolled in primary-care settings.They underwent an opportunistic electrocardiogram screening with a handheld device(My Diagnostick)designed to specifically detect AF.The electrocardiogram recordings were reviewed by the researchers,who confirmed the presence of AF.Results The device detected an arrhythmia in 143 patients,which was confirmed as AF in 101/143(70.6%),with an overall prevalence of AF of 5.5%(101/1820).Prevalence of unknown AF resulted in 3.6%in patients aged 65–74 years,and 7.5%in patients age 75 or older,and increased according to CHA2 DS2-VASc score:3.5%in patients with a score of 1 or 2,5.6%in patients with a score of 3,7.0%in patients with a score of 4,and 7.2%in patients with a score≥5.The detection rate was significantly higher in patients with mild symptoms compared to asymptomatic counterparts(24.1%vs.4.0%,P<0.0001).At multivariate analysis,congestive heart failure and age≥75 years-old were independent predictors for screen-detected AF.Conclusions An opportunistic screening with handheld device revealed an unexpectedly high prevalence of unknown AF in elderly patients with mild symptoms.Prevalence increased with age and CHA2DS2-VASc score. 展开更多
关键词 Atrial fibrillation handheld electrocardiogram Primary care SCREENING Stroke prevention
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A new handheld fundus camera combined with visual artificial intelligence facilitates diabetic retinopathy screening 被引量:3
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作者 Shang Ruan Yang Liu +7 位作者 Wei-Ting Hu Hui-Xun Jia Shan-Shan Wang Min-Lu Song Meng-Xi Shen Da-Wei Luo Tao Ye Feng-Hua Wang 《International Journal of Ophthalmology(English edition)》 SCIE CAS 2022年第4期620-627,共8页
AIM: To explore the performance in diabetic retinopathy(DR) screening of artificial intelligence(AI) system by evaluating the image quality of a handheld Optomed Aurora fundus camera in comparison to traditional table... AIM: To explore the performance in diabetic retinopathy(DR) screening of artificial intelligence(AI) system by evaluating the image quality of a handheld Optomed Aurora fundus camera in comparison to traditional tabletop fundus cameras and the diagnostic accuracy of DR of the two modalities. METHODS: Overall, 630 eyes were included from three centers and screened by a handheld camera(Aurora, Optomed, Oulu, Finland) and a table-top camera. Image quality was graded by three masked and experienced ophthalmologists. The diagnostic accuracy of the handheld camera and AI system was evaluated in assessing DR lesions and referable DR.RESULTS: Under nonmydriasis status, the handheld fundus camera had better image quality in centration, clarity, and visible range(1.47, 1.48, and 1.40) than conventional tabletop cameras(1.30, 1.28, and 1.18;P<0.001). Detection of retinal hemorrhage, hard exudation,and macular edema were comparable between the two modalities, in principle, with the area under the curve of the handheld fundus camera slightly lower. The sensitivity and specificity for the detection of referable DR with the handheld camera were 82.1%(95%CI: 72.1%-92.2%) and 97.4%(95%CI: 95.4%-99.5%), respectively. The performance of AI detection of DR using the Phoebus Algorithm was satisfactory;however, Phoebus showed a high sensitivity(88.2%, 95%CI: 79.4%-97.1%) and low specificity(40.7%, 95%CI: 34.1%-47.2%) when detecting referable DR.CONCLUSION: The handheld Aurora fundus camera combined with autonomous AI system is well-suited in DR screening without mydriasis because of its high sensitivity of DR detection as well as its image quality, but its specificity needs to be improved with better modeling of the data. Use of this new system is safe and effective in the detection of referable DR in real world practice. 展开更多
关键词 diabetic retinopathy image quality handheld camera artificial intelligence
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A comparison of handheld and standard ultrasound in Swiss medical students 被引量:1
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作者 Mark Slader Hayley Young +5 位作者 Margot Barker Kylie Prentice Katherine Bogaard Charlene Yuan Soheil Saadat Shadi Lahham 《World Journal of Emergency Medicine》 SCIE CAS CSCD 2022年第2期85-90,共6页
BACKGROUND:The use of ultrasound(US)within healthcare has inspired the development of new US technology.There have been few studies comparing the use of handheld US to standard US for medical education.This research a... BACKGROUND:The use of ultrasound(US)within healthcare has inspired the development of new US technology.There have been few studies comparing the use of handheld US to standard US for medical education.This research aims to determine whether a handheld US device can provide a comparable primary learning experience to that of a standard US machine.METHODS:Over two days of instruction,participants were taught and evaluated on core US fundamentals.The standard group received instruction on standard US machines,while the handheld group received instruction on handheld US devices.Participants completed a qualitative survey regarding their experience.Six hundred and four images were obtained and graded by two emergency medicine physicians.RESULTS:A total of 119 Swiss medical students were enrolled in our study.There was no statistically significant difference in the US assessment measurements,except for faster endpoint septal separation(EPSS)vascular setup time in the handheld group(P=0.001).There was no statistically significant difference in participants’perceived difficulty of US learning(P=0.198),comfort level(P=0.188),or self-estimated capability to perform US in the future(P=0.442).There was no statistically significant difference in the percentage of correctly obtained images(P=0.211)or images that were clinically useful(P=0.256).The median quality score of images obtained by the standard group was eight compared to seven in handheld group(P<0.01).CONCLUSION:Our data suggest a handheld US machine can perform as well as a standard US machine as an educational tool despite sacrifices in image quality. 展开更多
关键词 handheld ultrasound Ultrasound education Switzerland Medical education
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Assessment of handheld mobile terrestrial laser scanning for estimating tree parameters
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作者 Cornelis Stal Jeff rey Verbeurgt +1 位作者 Lars De Sloover Alain De Wulf 《Journal of Forestry Research》 SCIE CAS CSCD 2021年第4期1503-1513,共11页
Sustainable forest management heavily relies on the accurate estimation of tree parameters.Among others,the diameter at breast height(DBH) is important for extracting the volume and mass of an individual tree.For syst... Sustainable forest management heavily relies on the accurate estimation of tree parameters.Among others,the diameter at breast height(DBH) is important for extracting the volume and mass of an individual tree.For systematically estimating the volume of entire plots,airborne laser scanning(ALS) data are used.The estimation model is frequently calibrated using manual DBH measurements or static terrestrial laser scans(STLS) of sample plots.Although reliable,this method is time-consuming,which greatly hampers its use.Here,a handheld mobile terrestrial laser scanning(HMTLS) was demonstrated to be a useful alternative technique to precisely and efficiently calculate DBH.Different data acquisition techniques were applied at a sample plot,then the resulting parameters were comparatively analysed.The calculated DBH values were comparable to the manual measurements for HMTLS,STLS,and ALS data sets.Given the comparability of the extracted parameters,with a reduced point density of HTMLS compared to STLS data,and the reasonable increase of performance,with a reduction of acquisition time with a factor of5 compared to conventional STLS techniques and a factor of3 compared to manual measurements,HMTLS is considered a useful alternative technique. 展开更多
关键词 Forest inventory DBH Airborne laser scanning Terrestrial laser scanning handheld mobile laser scanning Point cloud processing
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An Analysis on Position Estimation, Drifting and Accumulated Error Accuracy during 3D Tracking in Electronic Handheld Devices
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作者 Shanjidah Akhter Pahlwan Rabiul Islam +2 位作者 Latifun Ahsin Bhuiyan Mehedi Hasan A. F. M. Saifuddin Saif 《Journal of Computer and Communications》 2018年第4期65-75,共11页
This work focuses on a brief discussion of new concepts of using smartphone sensors for 3D painting in virtual or augmented reality. Motivation of this research comes from the idea of using different types of sensors ... This work focuses on a brief discussion of new concepts of using smartphone sensors for 3D painting in virtual or augmented reality. Motivation of this research comes from the idea of using different types of sensors which exist in our smartphones such as accelerometer, gyroscope, magnetometer etc. to track the position for painting in virtual reality, like Google Tilt Brush, but cost effectively. Research studies till date on estimating position and localization and tracking have been thoroughly reviewed to find the appropriate algorithm which will provide accurate result with minimum drift error. Sensor fusion, Inertial Measurement Unit (IMU), MEMS inertial sensor, Kalman filter based global translational localization systems are studied. It is observed, prevailing approaches consist issues such as stability, random bias drift, noisy acceleration output, position estimation error, robustness or accuracy, cost effectiveness etc. Moreover, issues with motions that do not follow laws of physics, bandwidth, restrictive nature of assumptions, scale optimization for large space are noticed as well. Advantages of such smartphone sensor based position estimation approaches include, less memory demand, very fast operation, making them well suited for real time problems and embedded systems. Being independent of the size of the system, they can work effectively for high dimensional systems as well. Through study of these approaches it is observed, extended Kalman filter gives the highest accuracy with reduced requirement of excess hardware during tracking. It renders better and faster result when used in accelerometer sensor. With the aid of various software, error accuracy can be increased further as well. 展开更多
关键词 3D Tracking Error ACCURACY Extended KALMAN Filter handheld Device Position Estimation Sensor Virtual REALITY AUGMENTED REALITY
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Handheld 3D Scanner for Small Objects Using Kinect
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作者 Chia-Chi Hsu Chung-Lin Huang 《Journal of Electronic Science and Technology》 CAS CSCD 2016年第4期377-383,共7页
This paper presents a handheld 3D vision-based scanner for small objects by using Kinect. It is different from the previous color-glove-based approaches which require segmenting the target object. First, we eliminate ... This paper presents a handheld 3D vision-based scanner for small objects by using Kinect. It is different from the previous color-glove-based approaches which require segmenting the target object. First, we eliminate the noises and the outliers caused by holding hands. Second, we apply Kinect-fusion algorithm and truncated signed distance function (TSDF) to represent 3D surfaces. Third, we propose a modified integration strategy to eliminate the hand effect. Fourth, we take advantage of the parallel computation of GPUs for real-time operation. The major contributions of this paper are (1) the registration precision is improved, (2) the oflline amendment and loop closure operation are not required, and (3) concave 3D object reconstruction is feasible. 展开更多
关键词 handheld 3D scanning Kinect-fusion Truncated signed distance function (TSDF).
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Role of Wireless Handheld Technology by Nurses in Healthcare Environment
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作者 Abdul Hafeez-Baig Raj Gururajan 《Computer Technology and Application》 2012年第8期550-557,共8页
One of the emerging technologies is wireless handheld technology. Implication of these devices is enormous for business community and healthcare domain is not an exception to this phenomena. This research paper provid... One of the emerging technologies is wireless handheld technology. Implication of these devices is enormous for business community and healthcare domain is not an exception to this phenomena. This research paper provides some useful findings about the use of PDA's in the healthcare environment through actual usage of PDA in the healthcare ward. A qualitative and quantitative approach is adopted to explore these phenomena due to the exploratory nature of the research. Findings of this study identify some of the motivators and issues associated with the wireless handheld technology in healthcare environment. Furthermore, it is also found that these wireless handheld devices can help to improve the quality of care through better decision making processes. This study is limited to only one sate of Australian and further research is needed to see the implication of the findings to wider community and other domains in the Australian environment. 展开更多
关键词 Smart technology ICT (information and communication technology) wireless handheld devices healthcare adoption andactual use decision.
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国产化5G防爆手持终端研发及其在石化企业的应用
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作者 宋昊爽 焦云强 《当代石油石化》 CAS 2024年第3期42-46,共5页
随着5G技术在工业领域应用的快速发展,在炼化企业巡检、人员定位、融合通信等业务领域,为了提高现场便捷应用的效率和质量,降低操作人员的劳动强度,研发5G国产化、轻量化、多功能的一体化防爆手持终端成为迫切需要。文章旨在探讨国产化5... 随着5G技术在工业领域应用的快速发展,在炼化企业巡检、人员定位、融合通信等业务领域,为了提高现场便捷应用的效率和质量,降低操作人员的劳动强度,研发5G国产化、轻量化、多功能的一体化防爆手持终端成为迫切需要。文章旨在探讨国产化5G防爆手持终端的技术创新思路及应用场景,以助推石化企业的数字化转型,促进传统生产向智慧生产转型升级。 展开更多
关键词 5G 石化企业 防爆手持终端 数字化转型
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中学化学实验与信息技术融合的内涵与实践路径
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作者 钱扬义 陈浚铭 《课程.教材.教法》 CSSCI 北大核心 2024年第2期132-139,共8页
当前,中学化学实验面临与信息技术融合的迫切需求,手持技术正在推动技术融合进入数字化阶段。技术融合实现了实验技术的升级、实验组织的创变和实验社会化的过渡,有助于培养研究型、技术型、创新型人才。技术融合可遵循如下实践路径:在... 当前,中学化学实验面临与信息技术融合的迫切需求,手持技术正在推动技术融合进入数字化阶段。技术融合实现了实验技术的升级、实验组织的创变和实验社会化的过渡,有助于培养研究型、技术型、创新型人才。技术融合可遵循如下实践路径:在技术层面,借助手持技术突破实验难点,重点建立“技术—难点”的对应关系;在组织层面,构筑适配手持技术的实验组织系统,形成数字化实验理论框架、以案例为主体的内容体系和数字化“课程—教材—实验室”资源体系;在社会化层面,沿循“区域联动”等五大路径,促进成果资源的推广与交流。 展开更多
关键词 中学化学实验 信息技术 手持技术 教育数字化
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A Modified CycleGAN for Multi-Organ Ultrasound Image Enhancement via Unpaired Pre-Training
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作者 Haonan Han Bingyu Yang +2 位作者 Weihang Zhang Dongwei Li Huiqi Li 《Journal of Beijing Institute of Technology》 EI CAS 2024年第3期194-203,共10页
Handheld ultrasound devices are known for their portability and affordability,making them widely utilized in underdeveloped areas and community healthcare for rapid diagnosis and early screening.However,the image qual... Handheld ultrasound devices are known for their portability and affordability,making them widely utilized in underdeveloped areas and community healthcare for rapid diagnosis and early screening.However,the image quality of handheld ultrasound devices is not always satisfactory due to the limited equipment size,which hinders accurate diagnoses by doctors.At the same time,paired ultrasound images are difficult to obtain from the clinic because imaging process is complicated.Therefore,we propose a modified cycle generative adversarial network(cycleGAN) for ultrasound image enhancement from multiple organs via unpaired pre-training.We introduce an ultrasound image pre-training method that does not require paired images,alleviating the requirement for large-scale paired datasets.We also propose an enhanced block with different structures in the pre-training and fine-tuning phases,which can help achieve the goals of different training phases.To improve the robustness of the model,we add Gaussian noise to the training images as data augmentation.Our approach is effective in obtaining the best quantitative evaluation results using a small number of parameters and less training costs to improve the quality of handheld ultrasound devices. 展开更多
关键词 ultrasound image enhancement handheld devices unpaired images pre-train and finetune cycleGAN
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现代测绘技术在古建烫样数字化项目中的应用
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作者 王莫 《文物保护与考古科学》 北大核心 2024年第2期171-176,共6页
烫样是研究清代皇家建筑的珍贵文物,为配合文物信息数字化工作的开展,针对烫样数据的采集和处理方法进行了深入研究。在综合考虑多种数据采集方法的特点及烫样数字化记录的难点后,选择使用手持式三维扫描仪与多视角三维重建技术相结合... 烫样是研究清代皇家建筑的珍贵文物,为配合文物信息数字化工作的开展,针对烫样数据的采集和处理方法进行了深入研究。在综合考虑多种数据采集方法的特点及烫样数字化记录的难点后,选择使用手持式三维扫描仪与多视角三维重建技术相结合的方式来进行烫样的基础数据采集,并通过实践总结出了一套完整的数据采集和处理工作流程。与此同时,针对成果可能的应用方式做了些许尝试,且为数据的后期维护与进一步利用拟定了数据管理系统的建设方案。 展开更多
关键词 烫样 手持三维扫描 多视角三维重建 彩色纹理模型 正射影像图 数据管理系统
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手持SLAM设备在土方测量中的应用研究
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作者 王宗辉 闫宏昌 《科技资讯》 2024年第4期149-152,共4页
随着测绘技术的不断革新,传统的数据采集方法也在使用过程中出现了相关的弊端,无法满足现有项目的时间要求与精度要求,三维激光扫描技术的出现极大地提升了数据质量和数据采集速度,为现有项目的开展提供了数据支持。基于手持SLAM技术在... 随着测绘技术的不断革新,传统的数据采集方法也在使用过程中出现了相关的弊端,无法满足现有项目的时间要求与精度要求,三维激光扫描技术的出现极大地提升了数据质量和数据采集速度,为现有项目的开展提供了数据支持。基于手持SLAM技术在土方测量中的应用与优势展开研究,通过对手持SLAM技术原理、算法和关键技术进行分析,并结合工程实例利用手持SLAM和三维激光扫描仪对土方精度进行验证。实验证明,手持SLAM技术能够在土方测量中实现高精度、高效率的数据采集和建模,为土方方量计算奠定了数据基础。 展开更多
关键词 手持SLAM 土方测量 数据采集 精度分析
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手持式心电采集仪的使用技巧
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作者 景永明 荆凡釿 +1 位作者 黄训华 樊好义 《实用心电学杂志》 2024年第2期154-157,共4页
手持式心电采集仪是一款简易的双极单导联心电图记录设备,只需双手拇指紧捏正、负两极,就能方便地记录出标准Ⅰ导联心电图,多用于监测心律失常。它属于家用医疗器械,颇受广大中老年朋友的欢迎。基于单极导联与双极导联的本质及其内在联... 手持式心电采集仪是一款简易的双极单导联心电图记录设备,只需双手拇指紧捏正、负两极,就能方便地记录出标准Ⅰ导联心电图,多用于监测心律失常。它属于家用医疗器械,颇受广大中老年朋友的欢迎。基于单极导联与双极导联的本质及其内在联系,本文衍生出标准导联与加压单极导联的记录方法;同时,在深入探究CR导联与Wilson导联内在联系的基础上,创造性地提出了手持式心电采集仪直采CR胸导联心电图的方法。理论和实践均表明,加压单极肢体导联的等效记录法与CR胸导联的双极记录法不仅能满足临床需要,而且还有其独到之处。该方法能充分发挥家用医疗器械的医用价值,值得推广普及。 展开更多
关键词 心电图机 手持式心电采集仪 双极导联 单极导联 CR胸导联 Wilson胸导联 额面六轴系统 横面六轴系统
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利用手持激光点云的矿区自然林树干提取
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作者 王果 王成 +2 位作者 王宏涛 张成龙 吴博文 《激光与红外》 CAS CSCD 北大核心 2024年第1期57-62,共6页
为了定量刻画矿区复杂环境下自然林树木的三维结构信息,提出一种利用手持激光扫描仪的矿区自然林树干点云识别方法。借助手持激光扫描仪对矿区自然林进行扫描,在滤除地面点的基础上,引入多尺度垂直度特征进行矿区自然林树干识别,利用八... 为了定量刻画矿区复杂环境下自然林树木的三维结构信息,提出一种利用手持激光扫描仪的矿区自然林树干点云识别方法。借助手持激光扫描仪对矿区自然林进行扫描,在滤除地面点的基础上,引入多尺度垂直度特征进行矿区自然林树干识别,利用八叉树叶节点聚类方法对识别的树干进一步提取。通过矿区实测数据进行实验,结果表明,所提出的方法能够实现矿区自然林树干的识别,对矿区复杂环境下自然林树木的三维结构信息定量刻画、厘清矿区植被生长状况具有一定的参考价值。 展开更多
关键词 手持激光 矿区自然林 多尺度 垂直度 树干
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掌上多媒体通信协议的设计与实现
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作者 周云霞 李荣珩 《科技创新与应用》 2024年第14期9-12,共4页
随着智能移动设备的普及和多媒体技术的快速发展,掌上多媒体应运而生。该文以掌上多媒体技术在服务端和客户端的应用为场景,对通信协议的设计和实现进行深入的阐述和分析,并探讨其中涉及的通信原理和算法,给出实现掌上多媒体服务技术的... 随着智能移动设备的普及和多媒体技术的快速发展,掌上多媒体应运而生。该文以掌上多媒体技术在服务端和客户端的应用为场景,对通信协议的设计和实现进行深入的阐述和分析,并探讨其中涉及的通信原理和算法,给出实现掌上多媒体服务技术的核心机制和关键技术。最后,该文给出掌上多媒体通信协议的多个不同应用场景。 展开更多
关键词 通信协议 服务端 客户端 数据封装 掌上多媒体技术
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小型化拉曼光谱仪器的研制进展
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作者 韩聪 林东岳 +1 位作者 郑星 杨良保 《光散射学报》 北大核心 2024年第3期260-270,共11页
拉曼光谱仪是工业研究和实验室环境中广泛使用的光学仪器,用于物质的指纹识别和分析。随着实际使用过程中对测量环境的要求变化,越来越多的小型化拉曼光谱仪被设计出来,研制更便携的拉曼光谱仪已成为研发人员的目标。小型化拉曼光谱仪... 拉曼光谱仪是工业研究和实验室环境中广泛使用的光学仪器,用于物质的指纹识别和分析。随着实际使用过程中对测量环境的要求变化,越来越多的小型化拉曼光谱仪被设计出来,研制更便携的拉曼光谱仪已成为研发人员的目标。小型化拉曼光谱仪可以更好的满足仪器便携式的需求,使拉曼光谱检测技术应用到更广泛的领域。本文介绍了小型化拉曼光谱仪器的研制范式和仪器的几种类型,综述了小型化仪器研究中涉及的关键技术问题,针对其应用尤其是现场毒品、毒物、环境污染物检测方面进行了介绍。最后,本文展望了未来小型化拉曼光谱仪器的研究方向和可能的应用趋势,为小型化拉曼光谱仪的进一步研制提供参考。 展开更多
关键词 小型化拉曼光谱仪 便携式拉曼光谱仪 手持式拉曼光谱仪 手掌式拉曼光谱仪
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Improvement of registration accuracy of a handheld augmented reality system for urban landscape simulation 被引量:4
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作者 Tomohiro Fukuda Tian Zhang Nobuyoshi Yabuki 《Frontiers of Architectural Research》 CSCD 2014年第4期386-397,共12页
The need for visual landscape assessment in large-scale projects for the evaluation of the effects of a particular project on the surrounding landscape has grown in recent years. Augmented reality (AR) has been cons... The need for visual landscape assessment in large-scale projects for the evaluation of the effects of a particular project on the surrounding landscape has grown in recent years. Augmented reality (AR) has been considered for use as a landscape simulation system in which a landscape assessment object created by 3D models is included in the present surroundings. With the use of this system, the time and the cost needed to perform a 3DCG modeling of present surroundings, which is a major issue in virtual reality, are drastically reduced. This research presents the development of a 3D maporiented handheld AR system that achieves geometric consistency using a 3D map to obtain position data instead of GPS, which has tow position information accuracy, particularly in urban areas. The new system also features a gyroscope sensor to obtain posture data and a video camera to capture live video of the present surroundings. All these components are mounted in a smartphone and can be used for urban landscape assessment. Registration accuracy is evaluated to simulate an urban landscape from a short- to a long-range scale. The latter involves a distance of approximately 2000 m. The developed AR system enables users to simulate a Landscape from multiple and longdistance viewpoints simultaneously and to walk around the viewpoint fields using only a smartphone. This result is the tolerance level of Landscape assessment. In conclusion, the proposed method is evaluated as feasible and effective. 展开更多
关键词 Landscape simulation Augmented reality handheld device Registration accuracy ASSESSMENT
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移动手持激光扫描仪在建筑物竣工测量中的应用
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作者 汤同旭 陈燕 《测绘通报》 CSCD 北大核心 2024年第S02期62-66,95,共6页
随着科技的快速发展,测绘领域正迎来一场技术革新,三维激光扫描等新型测绘技术引领测绘地理信息服务向更为智能的方向发展。为研究测绘新技术在城市工程测量中的应用潜能,本文将移动手持激光扫描仪引入建筑物竣工测量中。基于ZEB-REVO R... 随着科技的快速发展,测绘领域正迎来一场技术革新,三维激光扫描等新型测绘技术引领测绘地理信息服务向更为智能的方向发展。为研究测绘新技术在城市工程测量中的应用潜能,本文将移动手持激光扫描仪引入建筑物竣工测量中。基于ZEB-REVO RT手持激光扫描仪获取竣工项目区域的点云数据,经点云解算和坐标转换,得到满足竣工测量条件的激光点云数据。基于点云数据,完成建筑物的地形提取与编辑,并借助传统的高精度测绘手段,对竣工测量成果进行精度检验。试验结果表明,基于手持激光点云数据的建筑物竣工成果,点位平面精度为±4.6 cm,边长精度为±2.4 cm,符合《城市测量规范CJJ/T 8—2011》中建筑物竣工测量精度标准。本文研究成果验证了手持激光扫描仪在建筑物竣工测量中的有效性与实用性,为测绘新技术在工程测量领域的应用提供了实践经验与参考。 展开更多
关键词 手持激光扫描仪 建筑物竣工测量 点云 坐标转换 精度检验
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一种基于柔性材料的可穿戴式天线设计
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作者 刘佳兴 刘亚伟 +3 位作者 陈平 徐子昂 文忠 高翔 《电讯技术》 北大核心 2024年第10期1576-1581,共6页
针对传统杆状天线在现代化战争应用场景中存在的带宽窄、质地硬以及隐蔽性与便携性较差等问题,提出了一种基于柔性介质材料的可穿戴式天线,该天线采用平面单极子天线的形式,极大地降低天线的剖面。借助电磁仿真软件CST Studio Suite 202... 针对传统杆状天线在现代化战争应用场景中存在的带宽窄、质地硬以及隐蔽性与便携性较差等问题,提出了一种基于柔性介质材料的可穿戴式天线,该天线采用平面单极子天线的形式,极大地降低天线的剖面。借助电磁仿真软件CST Studio Suite 2023进行仿真分析,该天线尺寸为270 mm×270 mm×1.1 mm,重量仅有120 g,包含0.37~1.8 GHz的实测宽带频段,在人体加载影响下,实测频段范围超过0.3~1.8 GHz。给出了反射系数S_(11)、辐射方向图的结果,分析了人体对天线的影响,结合通信电台开展实物对比测试。仿真与实测表明,可穿戴式天线在士兵手持电台中具有一定的应用前景。 展开更多
关键词 柔性材料 可穿戴式天线 手持电台
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