Jeong Seungyeon, Kuk Seungho, Kim Hyogon
Department of Computer Science and EngineeringKorea UniversitySeoul02841South Korea.
IEEE Access. 2019 Jan 25;7:20734-20747. doi: 10.1109/ACCESS.2019.2895075. eCollection 2019.
Smartphone magnetometer readings exhibit high linear correlation when two phones coexist within a short distance. Thus, the detected coexistence can serve as a proxy for close human contact events, and one can conceive using it as a possible automatic tool to modernize the contact tracing in infectious disease epidemics. This paper investigates how good a diagnostic test it would be, by evaluating the discriminative and predictive power of the smartphone magnetometer-based contact detection in multiple measures. Based on the sensitivity, specificity, likelihood ratios, and diagnostic odds ratios, we find that the decision made by the smartphone magnetometer-based test can be accurate in telling contacts from no contacts. Furthermore, through the evaluation process, we determine the appropriate range of compared trace segment sizes and the correlation cutoff values that we should use in such diagnostic tests.
当两部手机在短距离内共存时，智能手机磁力计读数呈现出高度线性相关性。因此，检测到的共存情况可作为近距离人际接触事件的替代指标，人们可以设想将其用作一种可能的自动化工具，以使传染病流行中的接触者追踪现代化。本文通过在多种测量中评估基于智能手机磁力计的接触检测的辨别力和预测力，研究其作为诊断测试的效果如何。基于灵敏度、特异性、似然比和诊断比值比，我们发现基于智能手机磁力计的测试所做的判断能够准确区分接触者和非接触者。此外，通过评估过程，我们确定了在此类诊断测试中应使用的比较轨迹段大小的合适范围和相关性截止值。
