Validity of the iPhone M7 motion co-processor as a pedometer for able-bodied ambulation

Physical activity benefits for disease prevention are well-established. Smartphones offer a convenient platform for community-based step count estimation to monitor and encourage physical activity. Accuracy is dependent on hardware–software platforms, creating a recurring challenge for validation, but the Apple iPhone® M7 motion co-processor provides a standardised method that helps address this issue. Validity of the M7 to record step count for level-ground, able-bodied walking at three self-selected speeds, and agreement with the StepWatch^TM was assessed. Steps were measured concurrently with the iPhone® (custom application to extract step count), StepWatch^TM and manual count. Agreement between iPhone® and manual/StepWatch^TM count was estimated through Pearson correlation and Bland-Altman analyses. Data from 20 participants suggested that iPhone® step count correlations with manual and StepWatch^TM were strong for customary (1.3 ± 0.1 m/s) and fast (1.8 ± 0.2 m/s) speeds, but weak for the slow (1.0 ± 0.1 m/s) speed. Mean absolute error (manual–iPhone®) was 21%, 8% and 4% for the slow, customary and fast speeds, respectively. The M7 accurately records step count during customary and fast walking speeds, but is prone to considerable inaccuracies at slow speeds which has important implications for certain patient groups. The iPhone® may be a suitable alternative to the StepWatch^TM for only faster walking speeds.     

新媒体环境下数字移民的媒介素养探索:基于智能手机应用的扎根分析

[目的/意义] 通过探索新媒体环境下影响数字移民媒介素养水平的因素,为适应其不断改变的个性特征与数字化学习的需求提出有效的建议,以期缩小代际鸿沟。[方法/过程] 基于国内外文献分析,采用以定性研究（扎根理论）为主、定量分析（问卷调查法）为辅的混合方法,对观察、访谈资料进行组织编码,从动机、情感、能力特征等层面归纳数字移民的媒介素养能力,并提出相应的优化策略。[结果/结论] 分析结果发现,新媒体环境下的数字移民活跃好学却又相对保守,其媒介素养水平与使用动机、情感感知、社会环境息息相关。因而,未来针对数字移民的媒介素养教育要持一种更为开放、互动的态度,在不断参与、接触的过程中提升其数字悟性和能力。     

Concurrent validity and reliability of an iPhone app for the measurement of ankle dorsiflexion and inter-limb asymmetries

The purpose of this investigation was to analyze the validity and reliability of an iPhone app (named: Dorsiflex) for the measurement of weight-bearing ankle dorsiflexion. To do this, twelve healthy participants (age=28.6±2.3 years) performed a weight-bearing lunge test with each leg in five separate occasions, while dorsiflexion angle was simultaneously registered using a professional digital inclinometer and the Dorsiflex iPhone app, which was specifically developed for this study. A total of 120 angles measured both with the digital inclinometer and the app were then compared for validity, reliability and accuracy purposes using several statistical tests. There was an almost perfect correlation between the digital inclinometer and the Dorsiflex app for the measurement of ankle dorsiflexion (r=0.989, 95% CI=0.986-0.993, SEE=0.48º), with trivial, non-significant differences between devices (SMD=0.17, p=0.10). When analyzing the reliability of the app for the measurement of five different trials for each participant, similar coefficients of variation (CV) were observed in comparison with those obtained with the digital inclinometer (Dorsiflex app: CV=5.1±2.3 %; Digital inclinometer: CV=4.9±2.5 %). The results of the present study show that weight-bearing ankle dorsiflexion can be easily, accurately, and reliably evaluated using the Dorsiflex iPhone app.     

汽车与智能手机产品开发过程对比分析与改进策略研究

面对日趋激烈的复杂市场竞争,传统汽车企业亟需思考如何借鉴IT产品的开发理念和方法,以更好地满足用户的个性化需求。为此,研究选择智能手机作为IT产品的典型代表,对汽车和智能手机产品的固有特点及产品开发过程进行全面对比与综合分析,系统评估了汽车企业借鉴智能手机产品开发思维、模式和方法,优化汽车产品开发流程的可能空间,并在此基础上提出改进汽车产品开发模式的方向性建议。     

高职学生基于智能手机学习英语态度的实证分析

以态度三元论为理论基础,编制具有良好信效度的高职学生基于智能手机移动学习英语态度测量量表,以此调查某高职在校大一学生移动学习英语的态度。得出如下结论:高职学生对移动学习英语的总体态度积极性一般,移动学习英语的主观感受和行动意愿两个方面不够积极;学生对移动学习英语的态度在不同性别、不同专业、不同英语学习动机方面存在显著差异;回归分析结果表明,“总体态度”“移动学习英语行为意向”维度、“移动学习英语情感体验”维度以及“移动学习英语重要性认知”维度对学生英语成绩有显著影响。根据此研究结果,可以采取有针对性的措施培养高职学生移动学习英语的积极态度。     

Validity and reliability of a computer-vision-based smartphone app for measuring barbell trajectory during the snatch

ABSTRACT

The purpose of this study was to investigate the validity of a smartphone app to measure biomechanical barbell parameters during the snatch. Ten collegiate NCAA division I athletes performed two repetitions each at 40, 50, 60, 70, and 80% of their 1-repetition maximum snatch. Barbell motions were simultaneously recorded with a motion capture system and the smartphone app. The motion capture system recorded the 3-D position of a reflective marker attached to the end of the barbell while the smartphone app was used to record sagittal plane video and track the shape of the weight plate from which the barbell center was derived. Peak forward (PFD) and backward (PBD) displacements and peak vertical displacement (PVD) and velocity (PVV) were calculated from both sets of data. Significant, strong to very strong Pearson’s product-moment correlation coefficients between both systems were noted for all parameters (r = 0.729–0.902, all p < 0.001). Small significant biases between systems were observed for PVD (ES = 0.284, p < 0.001) and PFD (ES=0.340, p < 0.01), while trivial to small, non-significant biases were observed for PBD (ES = 0.143) and PVV (ES = –0.100). Collectively, the results suggest that the app can provide biomechanical data of barbell motions similar to a 3-D motion capture system.     

手机病毒的危害及其防范

随着3G网络及更多智能手机的广泛使用,手机病毒离我们已不再遥远。本文介绍了手机病毒的概念及发展历史,然后列举了手机病毒的危害并介绍如何对手机病毒进行防范。     

道路设施数据的三维移动采集技术与应用

提出了一种Client/Server结构的无线移动式三维GIS系统,支持道路设施数据的实时采集与三维GIS动态建模的在线集成与交互操作模式.该系统采用智能手机作为客户端,现场采集道路设施空间位置与属性数据,并实时传送至GIS服务器.GIS服务器存储采集数据至数据库,自动建模后将更新的三维场景反馈给接受其服务的诸客户端.该系统原型使用C/C+ +与VB.Net 语言开发,并在北京地区进行了测试.结果表明,系统运行稳定,工作效率较高.     

移动数字迎新在高校迎新工作中的应用与实践

移动数字迎新是高校数字迎新工作的新模式,利用广泛普及的智能手持移动设备来代替数字迎新中常用的计算机和身份识别设备,充分发挥其联网方便快捷,二维码扫描高效准确和高实时性高交互性的特点,改进数字迎新的工作流程,减少不必要的保障环节,节约运营成本,提高工作效率。