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Neuromuscular Electrical Stimulation of Abdominal Muscles to Improve Standing Balance
Jeongwoo Je(Jeongwoo Je),Woochol Joseph Choi(Woochol Joseph Choi) 한국전문물리치료학회 2022 한국전문물리치료학회지 Vol.29 No.4
Background: Neuromuscular electrical stimulation (NMES) is used for muscle strengthening. While voluntary muscle contraction follows Henneman et al.’s size principle, the NMES-induced muscle training disrespects the neurophysiology, which may lead to unwanted changes (i.e., declined balance ability). Objects: We examined how the balance was affected by abdominal muscle training with the NMES. Methods: Fifteen young adults (10 males and 5 females) aged between 21 and 30 received abdominal muscle strengthening with NMES for 23 minutes. Before and after the training, participants’ balance was measured through one leg standing on a force plate with eyes open or closed. Outcome variables included mean distance (MDIST), root mean square distance (RDIST), total excursion (TOTEX), mean velocity (MVELO), and 95% confidence circle area (AREA) of center of pressure data. Two-way repeated measures analysis of variance was used to test if these outcome variables were associated with time (pre and post) and vision. Results: All outcome variables were not associated with time (p > 0.05). However, all outcome variables were associated with vision (p = 0.0001), and MVELO and TOTEX were 52.4% (45.5 mm/s versus 95.6 mm/s) and 52.4% (364.1 mm versus 764.5 mm) smaller, respectively, in eyes open than eyes closed (F = 55.8, p = 0.0005; F = 55.8, p = 0.0005). Furthermore, there was no interaction between time and vision (F = 0.024, p = 0.877). Conclusion: Despite the different neurophysiology of muscle contraction, abdominal muscle strengthening with NMES did not affect balance.
[PA-0008] Assembly and Analysis of the Complete mitogenome of Silybum marianum
Jeongwoo Lee(Jeongwoo Lee),Yedomon Ange Bovys Zoclanclounon(Yedomon Ange Bovys Zoclanclounon ),Hwajin Jung(Hwajin Jung),Taeho Lee(Taeho Lee),Jeonggu Kim(Jeonggu Kim),Guhwang Park(Guhwang Park),Keunpyo 한국육종학회 2022 한국육종학회 공동학술발표집 Vol.2022 No.-
Exploring Spin orbit torque efficiency of A15 phase W₃Ta heavy metal
Jeongwoo Seo,Jeonghun Shin,Jungyup Yang,Jinpyo Hong 한국자기학회 2021 한국자기학회 학술연구발표회 논문개요집 Vol.31 No.2
Magnetization manipulation by a Spin Orbit Torque (SOT) phenomena using novel heavy materials has intense focus on the efficient operation of spintronic devices at lower powers. The previously published theoretical work suggested that a W₃Ta layer might have a large spin hall angle, compared with those of the well-known Heavy Metals such as W, Ta. Here, we address the SOT Efficiency of W₃Ta material in a W₃Ta/ CoFeB/MgO hetero-frame. Our in-plane DC analyses confirmed the SOT efficiency of W₃Ta by means of spin orbit torque-driven effective fields and spin hall angle, where the W₃Ta layer were systematically prepared by adjusting different parameters, such as working pressure and annealing temperature. Experimental observation indicate that the enhanced SOT efficiency strongly depends on the crystal structure of particular A15 phase(β-phase) existing in an extremely narrow growth ranges, as seen in fig 1. 〈그림 본문참조〉
Jeongwoo Lee,Kookeui Hong,최승목,Seongeun Yu,최회명,민경덕 대한기계학회 2013 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.27 No.4
As vehicle emissions regulations have become stricter, improving injection strategies and using high EGR rates has become important to reduce engine-out emissions. Previous research has found that, a multiple injection strategy with a pilot or post injection has the potential to improve the distribution of the air-fuel mixture or oxidation. Thus, it is important to determine the effect of multiple injection strategies on the engine-out emissions. Especially, since the latest diesel engines have used high EGR rates to reduce NOx emission, the target of emissions is different from that of moderate EGR rate condition. Under heavy EGR rate condition, it is needed to improve combustion efficiency by reduction of CO and THC emissions. Therefore, in the first research as part 1, the effects of pilot injection on the engine-out emissions were systemically evaluated for two different EGR rate conditions (30 % and 60 %). The characteristics of the pilot injection were different between the two EGR rate conditions because the behavior of diesel combustion is significantly different when the EGR rate is changed. This research condition was investigated using varying injection parameters such as the timing and quantity of the pilot injection. The results show that each different pilot injection strategy was suggested between two EGR rate conditions to reduce engine-out emissions. Under moderate EGR rate condition, very earlier pilot SOI with large amount has the potential to reduce NOx and PM emissions simultaneously. On the other hand, under heavy EGR rate condition, the closest pilot SOI to main SOI has the potential to reduce CO and THC emissions.