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Electromyographic analysis according to shoe weight during ambulation
Lee, Eunsang,Lee, Byunghoon,Cho, Juchul,Lee, Yongwoo,Lee, Seungwon korean Academy of Physical Therapy Rehabilitation 2015 Physical therapy rehabilitation science Vol.4 No.2
Objective: To examine the effects of different shoe weights on lower leg muscle fatigue when walking by electromyographic (EMG) analysis due to the most effective weight for loading not being established. Design: Cross-sectional study. Methods: Thirty healthy university students (15 male, 15 female) were enrolled and randomly assigned into three conditions, which included wearing athletic shoes with an addition of 300 g, 500 g, and 1,000 g weights respectively. Prior to walking, all subjects were instructed to sit in a chair for 10 minutes. All subjects walked at a speed of 3.6 m/s on a treadmill for 20 minutes without rest. EMG measurements were taken using the median power frequency to assess for the effect of the different weight of shoes on muscle fatigue of the soleus, gastrocnemius, and tibialis anterior while walking on a treadmill in an upright posture. EMG measurements were taken during the first and last 30 seconds of walking. Results: In terms of muscle fatigue, for the soleus, the median power frequency was significantly lower with 1,000 g compared with 300 g and 500 g (p<0.05). For the tibialis anterior, the median power frequency was significantly lower with 1,000 g than 300 g and 500 g (p<0.05). For the gastrocnemius, the median power frequency was significantly lower with 1,000 g compared with 300 g (p<0.05). Conclusions: Increased shoe weight increases soleus, gastrocnemius, and tibialis anterior muscle fatigue during ambulation.
A Study on HMD-AR based Industrial Training System for Live Machinery Operation
Lee, Beomhee,Choi, Jinyeong,Choi, Byunghoon,Lee, Jisung,Min, Byungjun,Cho, Juphil The Institute of Internet 2018 International Journal of Internet, Broadcasting an Vol.10 No.1
As technological development is progressing recently, various technologies are actively being studied in the course of the 4th industrial revolution. So, even in the educational field, virtual reality and augmented reality technology are used in educational environments, but specialized additional equipment is required and the price is very expensive. Also, since a plurality of equipment are required for a large number of people, it is urgent to study the technology that can be effectively applied to the industrial education field. So in this paper, we propose an industrial training system for HMD-AR, MPEG-DASH and SOAP based HTTP based Live Machinery Operation using Smartphone to solve the problems of existing system.
Magnetic Nanovector Enabling miRNA-34a Delivery for CD44 Suppression with Concurrent MR Imaging
Lee, Hwunjae,Kim, Hyun-Ouk,Son, Hye-Young,Lee, Sang-Bock,Jang, Eunji,Kang, Byunghoon,Haam, Seungjoo,Lim, Eun-Kyung,Huh, Yong-Min American Scientific Publishers 2016 Journal of Nanoscience and Nanotechnology Vol.16 No.12
<P>We report the development of a microRNA (miRNA)-based theragnostic system that can facilitate simple therapeutic miRNA-34a delivery and visualization by high-resolution magnetic resonance (MR) imaging. Magnetic nanovectors were formed by directly attaching miRNA-34a to the surface of magnetic nanoparticles (MNPs), modified nitrosonium tetrafluoroborate (NOBF4) and subsequently introduced polyethylene glycol (PEG) molecules for high stability in an aqueous phase. The miRNA-34a-conjugated magnetic nanovectors showed therapeutic effects, inhibiting cellular migration and invasion through CD44 gene suppression; they also exhibited a strong MR signal. These results demonstrate that magnetic nanovectors have potential as theragnostic nanosystems for miRNA-based cancer therapy.</P>