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The complexity of human performance variability on watch standing task.

Waldemar Karwowski1, David Kern2, Atsuo Murata3

  • 1Department of Industrial Engineering and Management Systems, University of Central Florida, Orlando, FL, 32816, USA.

Applied Ergonomics
|July 30, 2018
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Summary

Naval watch standing times exhibit complex, chaotic, and fractal patterns. This finding highlights the need for human-centered design in complex operational systems.

Keywords:
ChaosComplexityFractalsHuman performance variabilityNonlinear systems dynamicsWatch standing task

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Area of Science:

  • Naval Operations Research
  • Complexity Science
  • Human Factors Engineering

Background:

  • The topside roving watch task is critical for naval operations.
  • Understanding temporal variability in watch standing is essential for system design.

Purpose of the Study:

  • To analyze the temporal variability of human performance in naval watch standing.
  • To investigate chaotic behavior and fractal properties in reported watch times.

Main Methods:

  • Analysis of time intervals from USS Jason Dunham deck logs (2013-2015).
  • Application of the 0-1 test, Lyapunov exponents, fractal dimension, and 1/f spectral analysis.

Main Results:

  • Watch standing time reports demonstrate properties of chaotic systems.
  • Data analysis revealed fractal characteristics in the temporal fluctuations.
  • Fluctuations in reported times exhibit non-random, complex behavior.

Conclusions:

  • The human temporal variability in naval watch standing is complex and exhibits chaotic and fractal properties.
  • Findings have critical implications for human-centered design in complex naval systems.
  • Further research into human performance complexity in operational environments is warranted.