Design of handheld terminal for shock wave pressure measurement system

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.

Screening of unknown atrial fibrillation through handheld device in the elderly

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.

A new handheld fundus camera combined with visual artificial intelligence facilitates diabetic retinopathy screening

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.

A comparison of handheld and standard ultrasound in Swiss medical students

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.

Assessment of handheld mobile terrestrial laser scanning for estimating tree parameters

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.

An Analysis on Position Estimation, Drifting and Accumulated Error Accuracy during 3D Tracking in Electronic Handheld Devices

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.

Handheld 3D Scanner for Small Objects Using Kinect

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.

Role of Wireless Handheld Technology by Nurses in Healthcare Environment

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.

A Modified CycleGAN for Multi-Organ Ultrasound Image Enhancement via Unpaired Pre-Training

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.

Mixed reality head mounted displays for enhanced indoor point cloud segmentation with virtual seeds

Mixed Reality(MR)Head Mounted Displays(HMDs)offer a hitherto underutilized set of advantages compared to conventional 3D scanners.These benefits,inherent to MR-HMDs albeit not originally intended for such appli-cations,encompass the freedom of hand movement,hand tracking capabilities,and real-time mesh visualization.This study leverages these attributes to enhance indoor scanning process.The primary innovation lies in the con-ceptualization of manual-positioned MR virtual seeds for the purpose of indoor point cloud segmentation via a region-growing approach.The proposed methodology is effectively implemented using the HoloLens 2 platform.An application is designed to enable the remote placement of virtual tags based on the user’s visual focus on the MR-HMD display.This non-intrusive interface is further enriched with expedited tag saving and deletion functionalities,as well as augmented tag visualization through overlaying them on real-world objects.To assess the practicality of the proposed method,a comprehensive real-world case study spanning an area of 330 s^(2) is conducted.Remarkably,the survey demonstrates remarkable efficiency,with 20 virtual tags swiftly deployed,each requiring a mere 2 s for precise positioning.Subsequently,these virtual tags are employed as seeds in a region-growing algorithm for point cloud segmentation.The accuracy of virtual tag positioning is found to be exceptional,with an average error of 2.4±1.8 cm.Importantly,the user experience is significantly enhanced,leading to improved seed positioning and,consequently,more accurate final segmentation results.

基于双系统的变电站信息自动验收手持终端设计与分析

为提高变电站设备监控信息验收效率,加快集控系统建设进程,设计了一种基于智能电网控制系统(D5000)与新集控系统的变电站信息自动验收手持终端。首先概括了当前国内外变电站信息自动验收技术现状与不足,然后分析了手持终端的工作原理,随后研究了D5000双平面信号校核结果展示、新集控系统监控信号的自助验收与结果展示、新集控系统与D5000系统信号断面差异化展示3种技术方案,在Ⅲ区搭建变电站自动验收平台,并依托i国网移动软件,实现自动验收平台的手持终端应用,最后进行手持终端功能和硬件设计,并给出了标准化的工作流程。

煤矿无线远程遥控信号及操车系统研究

针对邱集煤矿井口及各水平操车系统操作采用传统的人工现场控制方式,以及操车系统信号通信设备陈旧造成的人工成本高、效率低、安全隐患大的问题,利用“无线遥控+千兆以太网平台+PLC可编程控制+5G无线通信”相融合的技术,设计了可以通过5G无线信号网络进行信息互通,操控人员就近控制无线遥控器,对操车设备进行无线操控,有利实现全矿提升机运行工作状态、故障报警、任务安排等综合信息互享,以便于操控人员及时高效地制定调度控制策略,实现减少人工成本和提高提升机运行效率的效果。

果蔬品质手持式近红外光谱检测系统设计与试验

为满足果蔬加工过程快速检测和质量控制的实际需求,研发近红外光谱技术的低成本、实用化、小型化的果蔬品质手持式检测系统。在分析当前近红外光谱实用化过程的瓶颈问题的基础上,提出果蔬品质的手持式检测系统设计方案,阐述了硬件系统选择和软件系统构建,介绍了检测系统的工作原理;选用近红外微机电系统的数字微镜器件作为分光元件,以单点探测器获取检测信息,从而实现光谱检测系统的微型化设计和系统成本的显著降低。以检测番茄为例,利用设计的手持式检测系统,获取番茄900~1 700 nm范围的近红外光谱,利用先选择特征波段再优选波长的建模策略,分别建立了番茄中番茄红素和可溶性固形物含量的定量检测模型;可溶性固形物含量模型的预测相关系数和预测均方根误差分别为0.899和0.133%;番茄红素模型的预测相关系数和预测均方根误差分别为0.886和2.508 mg/kg。研究表明该系统能够满足果蔬品质的快速无损检测要求,可为实用化、小型化的手持式光谱检测仪设计和开发提供参考。

手持式ATP生物荧光检测仪研制

针对微量三磷酸腺苷（ATP）检测需求,利用生物荧光技术,设计了一种手持式ATP检测仪。该检测仪以小型光电倍增管PMT为光电转换器件,通过有效的干扰屏蔽和信号采集放大电路设计,实现了ATP反应释放微弱荧光信号的采集。以10^-15-10^-9mol/L标准ATP样品为检测对象,以大型分析仪器F4500为对比仪器,进行了梯度对比实验,结果表明,本仪器可检测最低ATP浓度为10^-14mol/L,是F4500最低检测限的1/100。检测时间为10s时,在10v-14-10^-9mol/L浓度范围内,本仪器响应值与标准ATP样品浓度在对数坐标下线性相关,相关系数达到了0.9902。

手持式可见近红外苹果品质无损检测系统设计与试验

为实现苹果多产地多品质指标的现场快速无损检测与评价,该研究基于可见近红外光谱技术研发低成本、低功耗、小型化的苹果品质手持式无损检测终端。检测终端集成宽谱LED光源和水果特征响应窄带光电探测器,接入物联网云端数据系统,实现检测数据上传和模型的远程更新维护。利用研制的检测系统可有效获取不同产区苹果500~1050 nm波长范围内的漫反射光谱,优选光谱预处理算法消除干扰并采用不同特征波长提取算法对数据进行降维,分别建立了多产地苹果可溶性固形物含量、硬度和维生素C含量的通用检测模型,模型的预测相关系数分别为0.926、0.798和0.704,预测均方根误差分别为0.585%、1.405 kg/cm^(2)和0.968 mg/100g。将通用检测模型载入云端数据系统作为云模型,检测样本时调用云模型进行计算并反馈至检测终端。通过多个产地独立样本的验证表明,该系统可满足苹果产业现场无损检测的实际需求,为手持式光谱检测仪的实用化设计提供参考。

用于手持设备的嵌入式计算机系统设计

文章给出了一种用于手持设备的嵌入式计算机系统设计方案。系统基于IntelStrongARM处理器,支持TFT液晶显示器、触摸屏、快捷键等多种外设和接口;运行WindowsCE操作系统,集成了汉字手写识别和电子地图软件,并运行专门开发的用户程序。文中对系统的组成结构、I/O接口、操作系统定制、应用程序结构等进行了详述。

嵌入式手持无线农产品价格信息采集终端

手持无线农产品价格信息采集终端采用ARM-Linux嵌入式体系设计,通过GPRS无线网络向远程服务器上传农产品价格信息同时接收系统的采集指令。手持终端利用Qtopia core用户界面支持,提供了友好的用户界面,并利用嵌入式数据库实现农产品种类和历史记录的管理,使用户操作简单、直观、方便。手持无线农产品价格信息采集终端为农产品价格采集系统提供了具有良好用户体验的终端设备,为在全国范围内实现农产品价格监控提供了技术保障。

基于手持设备的电力检修作业地线挂接信息管理系统的开发

针对现有的电力线路停电检修挂接地线管理模式所存在的安全隐患,开发了一套基于手持设备在Android系统环境下运行的电力检修作业接地线信息管理系统。该系统可收集现场作业区域内所有挂接地线的实时挂接状态、地理位置以及作业现场的图像信息,方便现场作业管理人员对作业区域内电力线路检修作业挂接地线状态的管理与监控,可有效地杜绝挂接地线误送电事故的发生,保障线路检修作业人员和设备的安全。

货检移动手持系统的设计与实现

根据铁路货检作业的实际需求,研发货检移动手持系统。系统的物理拓扑结构分为应用服务器、集中控制服务器、无线接入点和手持终端4部分,逻辑结构分为系统应用层、业务逻辑层和数据层3层。通过终端功能的开发、信息的集成和业务流程的优化,实现了数字、图片与语音的融合。货检移动手持系统具有对讲、拍照、定位和信息反馈等功能,从而实现了货检作业的移动办公。货检移动手持系统在兰州局的实际应用表明,采用该系统,实现了货检作业的全程控制和闭环管理,提高了货检作业的质量和效率。

基于ARM9微处理器的嵌入式手持无线点菜系统的设计

针对现有点菜系统实时性和移动性差的问题,设计了一个基于ARM9S3C2440的新型嵌入式手持无线点菜系统.该系统在S3C2440内核基础上实现了μC/OSⅡ操作系统的移植,在图形构建软件μC/GUI下构建了整个系统的图形界面,根据设计需求实现了对点菜系统的程序功能.测试结果表明:在实时性和测试距离上效果良好,达到了应用指标.该设计对提高餐饮企业的服务质量,降低费用有积极的推动作用.