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( Da-gyeom Hwang ),( Joong-hwi Kim ) 대한물리치료학회 2015 대한물리치료학회지 Vol.27 No.5
Purpose: The purpose of this study was to provide methods for assessment of functional balance through study of correlation with the weight bearing ratio, functional balance, and functional gait on patients with stroke. Methods: Thirty-nine patients with stroke participated in this study. The timed up and go test was used to measure balance and the functional ambulation category test to measure functional gait. Weight bearing was measured in the quiet standing posture and weight bearing in the quiet standing posture immediately after performing the standing-task. Results: Both timed up and go test and functional ambulation category test showed significant correlation with balance in the quiet standing posture immediately after performing the standing task. Conclusion: Measurement of balance in the quiet standing posture immediately after performing the standing-task was considered a meaningful scale for measurement of both balance function and gait function of patients with stroke.
Hwang, Da-Gyeom,Kim, Joong-Hwi 대한물리치료학회 2015 대한물리치료학회지 Vol.27 No.5
Purpose: The purpose of this study was to provide methods for assessment of functional balance through study of correlation with the weight bearing ratio, functional balance, and functional gait on patients with stroke. Methods: Thirty-nine patients with stroke participated in this study. The timed up and go test was used to measure balance and the functional ambulation category test to measure functional gait. Weight bearing was measured in the quiet standing posture and weight bearing in the quiet standing posture immediately after performing the standing-task. Results: Both timed up and go test and functional ambulation category test showed significant correlation with balance in the quiet standing posture immediately after performing the standing task. Conclusion: Measurement of balance in the quiet standing posture immediately after performing the standing-task was considered a meaningful scale for measurement of both balance function and gait function of patients with stroke.
A Study of SBAS Position Domain Analysis Method: WAAS and EGNOS Performance Evaluation
Kim, Dong-Uk,Han, Deok-Hwa,Kim, Jung-Beom,Kim, Hwi-Gyeom,Kee, Chang-Don,Choi, Kwang-Sik,Choi, Heon-Ho,Lee, Eun-Sung The Institute of Positioning 2016 Journal of Positioning, Navigation, and Timing Vol.5 No.4
A Satellite Based Augmentation System (SBAS) is a system that provides positioning information with high and accurate reliability to users who require ensuring high safety such as airplane taking off and landing. A continuous performance evaluation on navigation safety facilities shall be performed to determine whether developed systems meet the required performance before and after the operation. In this paper, SBAS position domain analysis is discussed in relation to analysis items for performance evaluation. The performance evaluation on the SBAS in the position domain shall conduct analysis on accuracy, integrity, continuity, and availability, which are items in the required navigation performance (RNP). In the paper, position domain analysis was conducted with regard to the Wide Area Augmentation System (WAAS) in the USA and the European Geostationary Navigation Overlay Service (EGNOS), which were developed already and now under operation. The analysis result showed that each of the systems satisfied the APV-I performance requirements recommended by the International Civil Aviation Organization (ICAO) with regard to daily data. It is necessary to verify using long-term data, whether the performance requirements in the RNP items are satisfied for system certification.
Fe-Si 전기강판 폐스크랩을 이용한 연자성 분말 및 테이프 제조기술
홍원식,김상현,박지연,오철민,이우성,김승겸,한상조,심금택,김휘준,Hong, Won Sik,Kim, Sang Hyun,Park, Ji-Yeon,Oh, Chulmin,Lee, Woo Sung,Kim, Seung Gyeom,Han, Sang Jo,Shim, Geum Taek,Kim, Hwi-Jun 한국마이크로전자및패키징학회 2016 마이크로전자 및 패키징학회지 Vol.23 No.2
This study focused on examining the possibility for recycling of Fe-Si electric sheet. We manufactured Fe-6.5Si mother alloy using by Fe-Si electric sheet scrap for transformer core materials. And then, soft magnetic alloy powder which diameter and shape were $45{\sim}150{\mu}m$ and sphere type was prepared by gas atomization process. As we compared to commercial Fe-6.5Si powder, its diameter distribution and microstructure of recycled powder was a similar. To investigate the possibility of reusing the soft magnetic composite sheet for electronics, recycled powder was treated to have a high aspect ratio (AR), and we finally obtained the 65~66 AR and $2.3{\mu}m$ thickness powder. To release the residual stress of powder, heat treatment was conducted under $300{\sim}400^{\circ}C$, $N_2$ gas. And then, soft magnetic sheet was made by tape casting process using by those powders. After the density and permeability of tape was measured, and we confirmed that the recycled Fe-Si electric sheet scrap was possible to reuse the soft magnetic materials of electronics.
Fe-Si 전기강판 폐스크랩을 이용한 3원계 Fe-9.8Si-6.0Al 합금의 연자성 특성
홍원식,양형우,박지연,오철민,이우성,김승겸,한상조,심금택,김휘준,Hong, Won Sik,Yang, Hyoung Woo,Park, Ji-Yeon,Oh, Chulmin,Lee, Woo Sung,Kim, Seung Gyeom,Han, Sang Jo,Shim, Geum Taek,Kim, Hwi-Jun 한국마이크로전자및패키징학회 2017 마이크로전자 및 패키징학회지 Vol.24 No.1
Fe-9.8Si-6.0Al mother alloy was manufactured using by Fe-3.5Si recycled scrap and Si powder. And then, soft magnetic alloy powder of $D_{50}$ size and sphere type were prepared by gas atomization process. To obtain the soft magnetic powder of a high aspect ratio, in the first, we conducted the ball milling process for 8 hours. And heat treatment was performed under $650^{\circ}C$, 2 hours and $N_2$ atmosphere condition for reducing the residual stress of the powder. Based on these process, we made around $50{\mu}m$ diameter Fe-9.8Si-6.0Al powder, which morphology and shape was a similar to the commercial Fe-Si-Al powder. Finally, the soft magnetic sheets were prepared by tape casting process using by those powders. The permeability of the tape casting sheet was measured, and we confirmed the possibility of reusing to the soft magnetic materials of Fe-Si electric sheet scrap.