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Keita Nakayama,Masataka Sakane,Susumu Ejima,Daisuke Ito,Tomofumi Nishino,Sou Kitajima,Masashi Yamazaki 대한척추외과학회 2015 Asian Spine Journal Vol.9 No.6
Study Design: Prospective experimental study on humans. Purpose: To determine whether postural differences during a low-speed impact are observed in the sagittal and axial views, particularly in a relaxed state. Overview of Literature: Three-dimensional motion capture systems have been used to analyze posture and head-neck-torso kinematics in humans during a simulated low-speed impact, yet little research has focused on the axial view. Since a seatbelt asymmetrically stabilizes a driver’s right shoulder and left lower waist into the seat, it potentially creates movement in the axial view. Methods: Three healthy adult men participated in the experimental series, which used a low-speed sled system. The acceleration pulse created a full sine shape with a maximum acceleration of 8.0 m/s2 at 500 ms, during which the kinematics were evaluated in relaxed and tensed states. The three-dimensional motion capture system used eight markers to record and analyze body movement and head-neck-torso kinematics in the sagittal and axial views during the low-speed impact. Head and trunk rotation angles were also calculated. Results: Larger movements were observed in the relaxed than in the tensed state in the sagittal view. The cervical and thoracic spine flexed and extended, respectively, in the relaxed state. In the axial view, larger movements were also observed in the relaxed state than in the tensed state, and the left shoulder rotated. Conclusions: During simulated frontal impact, the rotation angle between the head and trunk was significantly larger in the relaxed state. Therefore, we recommend also observing movement in the axial view during impact tests.
A Study on Thermal Comfort when Wearing Air Ventilation Clothing at Construction Sites
( Ayano Dempoya ),( Kouhei Kuwabara ),( Yasuhiro Hamada ),( Keita Yamazaki ) 한국감성과학회 2021 한국감성과학회 국제학술대회(ICES) Vol.2021 No.-
In an effort to prevent heat stroke at construction sites, this study sought to evaluate the actual conditions of workers while wearing a full body harness (FH), and examine the effects of wearing FH on the thermal characteristics of ventilated work wear (VWW) using a thermal manikin. Results suggest that workers feel the reduced airflow associated with wearing a FH with VWW, causing them to work in a hot and unpleasant environment. Wearing FH under VWW resulted in the highest degree of clothing insulation and the lowest airflow velocity among four different clothing conditions. There is a need to consider measures to enhance the cooling effect and improve comfort for workers required to wear a FH with VWW.
A Study on Thermal Comfort when Wearing Air Ventilation Clothing at Construction Sites
( Ayano Dempoya ),( Kouhei Kuwabara ),( Yasuhiro Hamada ),( Keita Yamazaki ) 한국감성과학회 2021 추계학술대회 Vol.2021 No.0
In an effort to prevent heat stroke at construction sites, this study sought to evaluate the actual conditions of workers while wearing a full body harness (FH), and examine the effects of wearing FH on the thermal characteristics of ventilated work wear (VWW) using a thermal manikin. Results suggest that workers feel the reduced airflow associated with wearing a FH with VWW, causing them to work in a hot and unpleasant environment. Wearing FH under VWW resulted in the highest degree of clothing insulation and the lowest airflow velocity among four different clothing conditions. There is a need to consider measures to enhance the cooling effect and improve comfort for workers required to wear a FH with VWW.