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Nova Hélios Multiservices : Nettoyage industriel
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This report presents a comparison of the data collected from human subjects trying to maintain their postural stability as they perform a secondary task when they are subjected to real and simulated ship motion at sea and in the laboratory, respectively. The secondary task consisted of identifying and transcribing odd numbers on a touch pad as well as on a conventional writing pad. A number of factors contribute to the challenge of maintaining postural stability, which may result in impairment of the certain functionalities of the human body due to continuous motion. Motion sickness (MS) and motion induced fatigue are examples of such impairment. MS can occur when a person is exposed to continuous motion; it can in turn affect their performance and cause fatigue, loss of balance, and motivation. These problems inhibit the subject from working effectively on a ship. The project included using a mathematical model of the dynamics of the human body that calculates the angular motion that various joints experience and the associated mechanical work performed by the subject while trying to maintain their postural stability on a moving platform. The mathematical model consists of 15 body segments and 14 body joints resulting in ninety six degrees of freedom. The required data were obtained using a 6 DOF motion platform system, a motion capture system, a load cell, Tek-scan insole sensors, a Crossbow inertial measurement sensor, Xsens MTi sensor, and a GoPro camera. Four subjects participated. A secondary task was performed by each subject, during which they were asked to write on a touch pad as well as over a paper on a writing pad with the platform in motion. The data were collected, processed, and compared with the corresponding data for the same task on a ship during an experimental trial. The subjects were oriented at three different angles with each of the subjects facing six different conditions 0, 45, and 90 degrees and using both tablet and paper recording media. A comparison of the angular displacement of various joints at sea compared to those in the laboratory is provided and analyzed.
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