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The Effects of an 8-Weeks Training on Postural Control for the Elderly
유창호,권대규,표용준,김경 한국정밀공학회 2014 International Journal of Precision Engineering and Vol. No.
This paper presented the 8-weeks training effects of training system based on an unstable platform and a visual interactive system for improving the ability of postural control. To confirm the effects of the training, fifteen elderly volunteers took part in a series of balance training using this system. Fifteen elderly volunteers as the control group compared with the training group. To evaluate the effects of the training, the relevant parameters such as the time of timed up and go (TUG) test, the transfer limits of the different directions, the sway path of center of pressure (COP), and the root mean square (RMS) of COP in anteroposterior (AP) direction and mediolateral (ML) direction, concentric isokinetic strength of ankle and knee joints were measured from pre-training to post-training. The results showed that the training system could successfully assess the gradual improvement of the postural control capability of the volunteers in the system and showed a possibility of improving balance capability of the volunteers. Moreover, the significant improvement in the postural capability of the elderly suggested that the elderly could benefit more from the training using the system for the improvement of the ability of postural control.
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유창호,김성훈 한국재활복지공학회 2016 재활복지공학회논문지 Vol.10 No.3
Magnetic sensors and actuators have been widely used in industry and medical fields. Integrated systems based on sensors and actuators are defined as mechatronics that is the general combination of mechanics and electronics. Recently, magnetic wireless sensors and actuators have been developed and used at a systematic level. In particular, their mechanisms depend on magnetic, such as magnetic material and physical phenomena. However, their research boundary has not been clear. Researchers talk of magnetic micro-robots, magnetic actuators and sensors. Therefore, a new and correct definition is required. In this study, we introduce the advanced and extended concept of mechatronics, which is a magneto-mechantronics for biomedical and rehabilitation. Among various applications, we focused on wireless pump and sensing system for blood vessel rehabilitation and local motion capture, respectively.
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유창호,최윤수,김재명,Yoo, Chang-Ho,Choi, Yun-Soo,Kim, Jae-Myeong 한국공간정보학회 2008 한국공간정보학회지 Vol.16 No.3
Landslide, one of the serious natural disasters, has Incurred a large loss of human and material resources. Recently, many forecasting or alarm systems based on various kinds of measuring equipment have been developed to reduce the damage of landslide. However, only a few of these equipments are guaranteed to evaluate the safety of whole side of land slope with their accessibility to the slope. In this study, we performed some experiments to evaluate the applicability of a terrestrial LiDAR as a surveying tool to measure the displacement of a land slope surface far a slope collapsing protection system. In the experiments, we had applied a slope stability method to a land slope and then forced to this slope with a load increasing step by step. In each step, we measured the slope surface with both a total station and a terrestrial LiDAR simultaneously. As the result of Slope Fracturing analysis using all targets, the LiDAR system showed that three was 1cm RMSE on X-axis, irregularity errors on Y-axis and few errors on Z-axis compare with Total Station. As the result of Slope Fracturing analysis using continuous targets, the pattern of Slope Fracturing was different according to the location of continuous targets and we could detect a continuous change which couldn't be found using Total station. The accuracy of the LiDAR data was evaluated to be comparable to that of the total station data. We found that a LiDAR system was appropriate to measuring the behaviour of land slope. The LiDAR data can cover the whole surface of the land slope, whereas the total station data are available on a small number of targets. Moreover, we extracted more detail information about the behavior of land slope such as the volume and profile changes using the LiDAR data.
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유창호,Kaoru Matsumoto,Shuya Shida,김동준,Makoto Ohta 대한기계학회 2012 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.26 No.5
"The rupture of an aneurysm can lead to a subarachnoid hemorrhage, which can be fatal in a large percentage of cases. In treating aneurysms,intravascular stenting is thought as a better option compared with clipping treatment. The treatment of cerebral aneurysm with a porous stent also has recently been proposed as a minimally invasive way to prevent rupture and favor coagulation mechanism inside the aneurysm. Flow characteristics in a box-typed straight rigid silicone with a sphere attached to the center of a baseline straight tube have been investigated using particle image velocimetry (PIV) at Reynolds number of 300. A 20 mm long mesh-work of rhombus shape stent was tested in the present investigation. Four stent porosities of 100%, 80%, 74%, and 64% were examined. Reduced velocity, smaller average vorticity magnitude and different flow patterns inside the aneurysm are observed when the three different proposed stents are used. The lower porosity stent (Porosity = 64%) decreases the magnitude of the velocity by 98% and changes the flow pattern in the aneurysm. Our results show that not only the role of the porosity but also the stent shape affects the flow. Moreover, we hope that this work will help us understand the characteristic of stent designs."
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소래염전 소금창고와 부속시설물을 통해 본 근대산업유산의 가치
유창호 한국역사연구회 2024 역사와 현실 Vol.0 No.133
The Sorae Salt field, of which the construction began on June 10th, 1934 and completed on May 31st, 1937, was created by the Imperial Japanese Joseon Governor General office’s so-called “Phase-4 Expansion plan regarding the Sun-dried(“Cheonil”) salt fields.” This plan included sub-plans to secure an in-Joseon self-sufficiency in terms of edible salt, as well as increased salt production meant for industrial use, such as raw salt for the chemical industry. As a result, the Sorae Salt field featured technological innovations and in-house salter techniques that were quite different from other sun-dried salt fields that had been established in earlier periods. The most visible characteristic of the salt farms that have been newly created since the declaration of the phase-4 plan was that most of them were designed to be built in highland(高地式) areas. They were all created in places higher than the sea level, which meant there was lesser need or cost required in establishing embankment facilities that would have been otherwise necessary to make them less vulnerable to disasters. These salt fields also marked a departure from previous ones as they were designed to use electricity. In the Sorae Salt field, there were 80 salt warehouses which were in charge of the last step in salt creation. Including 2 major storage facilities in front of the Sorae station, there were 19 units in Section 1, 31 units in Section 2, and 28 units in Section 3. Unfortunately, only 4 units located in the present day’s Sorae Swamp Ecological park, and 2 other units within also today’s Shiheung Gaetgol Ecological park, are the only ones we still have. One of them was constructed in May 1936, and remains the oldest one among all the salt facilities affiliated with sun-dried salt fields in South Korea today. Sun-dried salt fields are indeed a cultural legacy that not only the Korean people but the entire world as well could appreciate, while salt facilities constitute a definite representation of that legacy
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