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.     

The validity and reliability of a novel app for the measurement of change of direction performance

ABSTRACT

The aim of the present investigation was to analyze the validity and reliability of a novel iPhone app (CODTimer) for the measurement of total time and interlimb asymmetry in the 5 + 5 change of direction test (COD). To do so, twenty physically active adolescent athletes (age = 13.85 ± 1.34 years) performed six repetitions in the COD test while being measured with a pair of timing gates and CODTimer. A total of 120 COD times measured both with the timing gates and the app were then compared for validity and reliability purposes. There was an almost perfect correlation between the timing gates and the CODTimer app for the measurement of total time (r = 0.964; 95% Confidence interval (CI) = 0.95–1.00; Standard error of the estimate = 0.03 s.; p < 0.001). Moreover, non-significant, trivial differences were observed between devices for the measurement of total time and interlimb asymmetry (Effect size < 0.2, p > 0.05). Similar levels of reliability were observed between the timing gates and the app for the measurement of the 6 different trials of each participant (Timing gates: Intraclass correlation coefficient (ICC) = 0.651–0.747, Coefficient of variation (CV) = 2.6–3.5%; CODTimer: ICC = 0.671–0.840, CV = 2.2–3.2%). The results of the present study show that change of direction performance can be measured in a valid, reliable way using a novel iPhone app.     

Understanding compulsive smartphone use: An empirical test of a flow-based model

Smartphones have gained significant popularity. With the rising concerns of compulsive smartphone use, understanding how smartphone users develop compulsive behaviors is crucial. In this study, we aim to investigate the role of flow in the formation of compulsive smartphone use. Drawing upon the flow theory, we incorporate the psychological state of flow as a key factor in our research model. We identify its determinants based on the desirability–feasibility perspective and reinforcement sensitivity theory. We empirically test our model by conducting an online survey with 384 valid responses. We expect that our findings can provide noteworthy insights on the formation of compulsive smartphone use.     

Reliability and validity of a GPS-enabled iPhoneTM “app” to measure physical activity

This study assessed the validity and reliability of an iPhone^TM “app” and two sport-specific global positioning system (GPS) units to monitor distance, intensity and contextual physical activity. Forty (23 female, 17 male) 18–55-year-olds completed two trials of six laps around a 400-m athletics track wearing GPSports Pro^TM and WiSpi^TM units (5 and 1 Hz) and an iPhone^TM with a Motion X GPS^TM “app” that used the inbuilt iPhone^TM location services application programming interface to obtain its sampling rate (which is likely to be ≤1 Hz). Overall, the statistical agreement, assessed using t-tests and Bland–Altman plots, indicated an underestimation of the known track distance (2.400 km) and average speed by the Motion X GPS^TM “app” and GPSports Pro^TM while the GPSports WiSpi^TM device overestimated these outcomes. There was a ≤3% variation between trials for distance and average speed when measured by any of the GPS devices. Thus, the smartphone “app” trialled could be considered as an accessible alternative to provide high-quality contextualised data to enable ubiquitous monitoring and modification of programmes to ensure appropriate intensity and type of physical activity is prescribed and more importantly adhered to.     

智能手机时代医学生智能手机成瘾现状及其对学习、睡眠的影响研究

智能手机时代,我国大学生基本人手一部智能手机,智能手机在我们的日常生活中扮演着越来越重要的角色,而大学生智能手机成瘾备受关注,此次研究从医学生的角度探究智能手机成瘾与学习、睡眠的影响关系。     

基于社会认知理论的智能手机用户信息安全行为意愿研究

[目的/意义]对智能手机用户信息安全行为意愿进行研究,可以帮助相关的政府或组织更好地提供针对性的信息安全教育和培训。[过程/方法]本文基于社会认知理论,建立智能手机用户信息安全行为意愿影响因素的概念模型,通过调查问卷收集数据并利用结构方程模型进行验证。[结果/结论]研究发现：感知威胁、反应效能、控制倾向和描述性规范对智能手机用户的信息安全行为意愿具有显著的正向影响,自我效能对行为意愿的影响不显著;作为社会环境的因素之一,描述性规范对感知威胁、反应效能、自我效能和控制倾向均有显著的影响。     

The Apple iPhone Shock in Korea

In this article, the author offers a critical review of government and corporate responses to the iPhone shock in Korea. The iPhone brings with it enormous challenges to the mobile service operators, handset manufacturers, software developers, policymakers, and general users. It may not be farfetched to argue that the future of mobile telecommunications in Korea depends on lessons learned from the iPhone shock and the actions taken in response. Although numerous reports on the iPhone and the smartphone in general have been published by the government agencies, telecom firms and their research arms, and other economic institutions notably since 2008, they are more or less summary reports by nature and substance. What is conspicuously lacking in these reports is a critical self-examination of the existing mobile telecom ecosystem, which has long been plagued by corporate and regulatory rigidity. Unless this issue is properly addressed and resolved, the iPhone shock would end up being a storm in a teacup and the much-talked-about power shift in the telecom ecosystem resulting from it would lead to nothing more than a cosmetic change in Korea.     

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。     

Effects of materialism on problematic smartphone dependency among adolescents: The role of gender and gratifications

We study youth materialism as an antecedent of problematic smartphone dependency among adolescents. Based on Uses and Gratifications theory and the I-PACE framework, we consider process- and social-oriented smartphones as mediators in the relationship between youth materialism and problematic smartphone dependency. Using data from 463 French late adolescents (mean 16.8 years; 58 % female), known as digital natives, we demonstrate that paths differ depending on gender. For girls, youth materialism is positively related to problematic smartphone dependency via social-oriented smartphone use, whereas this relationship is nonsignificant for boys. Moreover, youth materialism is positively related to problematic smartphone dependency via process-oriented smartphone use for both boys and girls, but the relationship is stronger for boys than for girls. We discuss the implications of these results for business and social policies.     

Validity and reliability of a novel iPhone app for the measurement of barbell velocity and 1RM on the bench-press exercise

The purpose of this study was to analyse the validity and reliability of a novel iPhone app (named: PowerLift) for the measurement of mean velocity on the bench-press exercise. Additionally, the accuracy of the estimation of the 1-Repetition maximum (1RM) using the load–velocity relationship was tested. To do this, 10 powerlifters (Mean (SD): age = 26.5 ± 6.5 years; bench press 1RM · kg^?1 = 1.34 ± 0.25) completed an incremental test on the bench-press exercise with 5 different loads (75–100% 1RM), while the mean velocity of the barbell was registered using a linear transducer (LT) and Powerlift. Results showed a very high correlation between the LT and the app (r = 0.94, SEE = 0.028 m · s^?1) for the measurement of mean velocity. Bland–Altman plots (R² = 0.011) and intraclass correlation coefficient (ICC = 0.965) revealed a very high agreement between both devices. A systematic bias by which the app registered slightly higher values than the LT (P < 0.05; mean difference (SD) between instruments = 0.008 ± 0.03 m · s^?1). Finally, actual and estimated 1RM using the app were highly correlated (r = 0.98, mean difference (SD) = 5.5 ± 9.6 kg, P < 0.05). The app was found to be highly valid and reliable in comparison with a LT. These findings could have valuable practical applications for strength and conditioning coaches who wish to measure barbell velocity in the bench-press exercise.