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LNG 연료추진 선박용 가스레귤레이팅밸브의 파일럿 밸브 수치해석에 관한 연구
이정욱,조광식,한승훈 한국기계기술학회 2023 한국기계기술학회지 Vol.25 No.5
The domestic shipbuilding industry is building high-value-added ships such as LNG and LPG, and the demand for natural gas, a clean energy source, is continuously increasing. Climate change, such as global warming, is occurring due to rising oil prices and excessive use of fossil fuels. To protect their homes from the changing environment, 121 countries announced intensive climate target policies to reduce carbon emissions to 0% by 2050. In this study, modeling and design were performed using SUS410 and SUS304L about the operating part of the Pilot valve based on the physical properties of the aluminum alloy used in the Pilot valve, a component of the gas pressure Regulating valve for LNG ships. Numerical We want to develop the optimal Pilot valve by comparing and analyzing the results using ANSYS, an analysis simulation program.
테라테인먼트 테이핑과 발바닥 운동이 대학생의 평발 개선에 미치는 영향
이정욱,윤영제,고선근 한국엔터테인먼트산업학회 2019 한국엔터테인먼트산업학회논문지 Vol.13 No.4
This study looked at the effects of teratainment taping and footpad exercise on the improvement of flat foot in a university student. We divided it into flexible flat foot taping group(n=13), flexible flat foot exercise group(n=14), rigid flat foot taping group(n=12), rigid flat foot exercise group(n=13) through a navicular drop test. After one hour's application of teratainment taping and footpad exercise, the height change of navicular, balancing ability and postural stability were evaluated. Change in the height of the navicular was measured before and after intervention, and the balancing ability was measured timed up & go test, and the postural stability ability was evaluated for stability limits in shoulder-width double leg stance, narrow base double leg stance, tandem stance. According to result, there was a statistically significant difference in the left and right foot of the flexible tapping group, right foot of the flexible tapping group, right foot of the rigid tapping group in the change in the height of the navicular in comparison pre- and post- intervention(p<0.5). There were no statistically significant differences in pre- and post- intervention comparisons intragroup and intergroup in balancing ability. There was a statistically significant difference in flexible flat foot exercise group and rigid flat foot taping group in tandem stance in comparison pre- and postintervention in the postural stability(p<0.5). And there was a statistically significant difference in tendem stance of the flexible flat foot exercise group compared to the rigid flat foot exercise group(p<0.5). The results of this study show that teratainment taping and footpad exercise have a significant effect on the improvement of flat foot in adults. Therefore, it is recommended to apply teratainment taping and footpad exercise to improve flat foot.
20대 남·여의 기능적 움직임 검사 점수와 호흡기능의 상관분석
이정욱 한국엔터테인먼트산업학회 2022 한국엔터테인먼트산업학회논문지 Vol.16 No.4
The purpose of this study is to investigate the relationship between FMS scores and respiratory function in healthy volunteers. The study’s subjects were 97 students (33 men and 64 women) in their healthy volunteers at H University in Gwang-ju. The subjects were instructed to perform the seven FMS movement patterns three times using the FMS Test Kit, and during the movements, their front, back, and side were filmed. For respiratory function, parameters related to forced vital capacity (FVC) and maximal voluntary ventilation (MVV) were measured using a digital pulmonary function measuring device, and a three-minute break was given after each measurement. A gender-based comparison of the male group FMS scores showed statistically significant high scores in deep squat (DS), hurdle step (HS), trunk stability push-up (TSPU), and rotary stability (RS), and female group were statistically significant high scores in shoulder mobility (SM) and active straight leg raise (ASLR). A gender-based comparison of the subjects’ respiratory function showed that male group had statistically significant higher values in FVC, FEV1, PEF, and MVV than female group. Correlations between the FMS and respiratory function by gender, only the male group showed correlations between the FMS and FVC and FEV1. The male group showed correlations in DS (FVC, FEV1), IL (FEV1), ASLR (FVC, FEV1), and TSPU (FVC), and the female group showed correlations in TSPU (FVC, PEF, MVV). Summarizing the results of this study, it was found that the motion of TSPU was generally correlated with functional movement screen testing and respiratory function in men and women. Therefore, it is recommended to include TSPU motion in the exercise program to improve respiratory function.