Development of the signals complex elaboration system (application for analysis of occupational injuries process)

TL;DR

This study analyzes occupational injury data across various databases using spectral analysis, revealing a deterministic polyharmonic pattern with daily and weekly cycles, challenging the Markov process assumption.

Contribution

It introduces a spectral analysis approach to characterize occupational injuries as a deterministic process with specific harmonic patterns, advancing understanding of injury dynamics.

Findings

Occupational injuries exhibit daily and weekly harmonic patterns.

Spectral analysis shows injuries follow a deterministic polyharmonic process.

The process is not Markovian but has stable spectral features across datasets.

Abstract

The theoretical base of the research of occupational injuries is the idea of the process as Markov chain of random variables. However the exact proof of this position was not carried out whereas the experimental passing of the hypothesis is connected always with the determined confidence limits and consequently it gives the space for alternative assumptions. In this research some databases of occupational injuries had been studied using spectral analysis techniques and the presentation of the occupational injuries as the temporal sequence of the cases ("telegraph wave" process type). Databases had corresponding chapters such as "enterprise" with number of employees about 7000, "big enterprise" (the number of employees about 35000), "whole branch of industry", "whole enterprises of industrial region" receiving during 10 years from different countries having distinguish system of the work organization (Russia and Italy). The behaviour of spectra on principal is not changed when vary the length of realization, resolution, smoothing, upper boundary frequency, country and year of datas. All spectra showed that the occupational injuries process has a not Markov, but deterministic polyharmonic behaviour. This phenomenon is characterized by the spectral lines with two frequencies corresponding 24 hours (circadian rythm have main amplitude) and 7 days (amplitude is two times smaller) exactly. Harmonics corresponding one month (biorythms) were not founded. The task of the futher investigations is to find the psychophysiological and biomedical processes determined and having high level of correlation with the occupational injuries process.