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Nurses with rotating shifts, including night shifts, have suffered from low physical activity during the COVID-19 pandemic and lower sleep quality due to the disruption of their circadian rhythm. This study aimed to develop and examine the effectiveness of a mobile wellness program on daily steps, sleep quality, exercise self-efficacy, intrinsic motivation for exercise, self-rated fatigue, and wellness. A cluster randomized controlled trial design was used to examine the effectiveness of the mobile wellness program for nurses with rotating shifts. Sixty nurses from one university hospital participated and were allocated to an intervention group and a control group. The intervention group received a 12-week mobile wellness program to improve their physical activity and sleep quality, and the control group was only given a Fitbit to self-monitor their health behaviors. There were significant differences between the two groups in daily steps (p = 0.000), three components (subjective sleep quality, sleep disturbance, daytime dysfunction) of the PSQI, exercise self-efficacy, intrinsic motivation for exercise, and wellness. In conclusion, this study provides meaningful information that the mobile wellness program using Fitbit, online exercise using Zoom, online health coaching on a Korean mobile platform, and motivational text messages effectively promoted physical activity and sleep quality for nurses with rotating shifts during the COVID-19 pandemic.

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PACS 75.50. Pp, 75.70.AkThe behavior of precipitates in magnetic GaMnN films upon annealing was investigated. The major precipitate was Mn 3 GaN phase in GaMnN layers grown via molecular beam epitaxy using a single GaN precursor under high Mn flux. With heat treatment of the films, the Mn 3 GaN phase decomposed and a part of it was converted to magnetic Mn 3 Ga phase through detachment of nitrogen. The decomposition kinetics was further accelerated by neutron irradiation, which generated defects in the lattice and assisted the decomposition of the precipitates. The saturation magnetization of the homogeneous GaMnN layer was increased after the heat treatment while it was decreased in the precipitated GaMnN layer. The increase and decrease of the magnetization of the heat-treated GaMnN films was explained consistently by the role of the precipitates in the films.