부패시체에서 유효적산온도(ADD)를 이용한 사후경과시간(PMI) 추정 애플리케이션(APP) 개발
Development the Mobile Application for the Estimate of Postmortem Interval (PMI) using Effective Accumulated Degree-day (ADD) from Decayed Bodies
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초록
부패 과정은 경과된 시간보다 누적된 온도에 따라 결정되므로 유효적산온도 (ADD) 는 사후경과시간 (PMI) 추정에 유효한 지표로 사용할 수 있다 . 이에 본 연구는 ADD 를 이용한 부패시체의 PMI 추정용 모 바일 애플리케이션 (mobile-phone application) 을 개발하고 , 이를 이용하여 , 사망시간을 알 수 있었던 총 20 건에서 PMI 를 추정하였다 . 추정된 PMI 와 실제 사망일과의 차이값을 계산하였을 경우 , 일 (day) 기준의 차 이는 평균 0.50±1.19 일 , 시간 (time) 기준으로는 0.58±1.03 일로 나타났다 . 또한 Bland Altman plot 을 통해 추 정된 PMI 의 정확성을 검정하였을 경우 , 95% 신뢰구간 내에 포함되는 사례는 15 건 (75%) 에 해당되며 , 일 기준으로 정확하게 일치하는 사례는 15 건 , 시간 기준으로 정확하게 일치하는 사례는 2 건을 확인하였다 .
Abstract
A decaying process is known to be determined by accumulated temperature rather than elapsed time, and ADD can be a valid factor for estimating PMI. This method can, thus, provide scholars and practitioners with objective PMI estimates by increasing its reliability. This study sets out to develop a mobile phone application that calculates the PMI for decayed bodies. We estimated PMI for 20 cases with identified information about each body’s time of death using the application. It was found that differences of 0.50±1.19 by day and 0.58±1.03 by hour existed between the estimated PMI and the actual date of death. Also, Bland Altman plot was used to test the accuracy of estimated PMI, showing that 15 cases (75%) were within the 95% confidence interval. Specifically, the estimation was accurately matched in 15 cases (75%) by day, but only two cases appeared to be matched when estimating by hour (time).
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