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표면매입 탄소섬유판으로 보강된 철근콘크리트 부재의 휨 거동에 관한 실험연구
임동환 ( Lim¸ Dong-hwan ),남민희 ( Nam¸ Min-hee ) 한국구조물진단유지관리공학회 2008 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.12 No.1
본 연구에서는 탄소섬유판이 표면 매입된 철근 콘크리트 보의 휨 거동 효과를 고찰하였다. 이를 위하여, 탄소섬유판이 표면 매입된 T 형 철근 콘크리트 보를 제작하여 실험을 수행하였다. 본 연구 결과, 표면매입(NSM) 탄소섬유판으로 보강된 철근콘크리트 부재의 휨 강성 및 극한강도는 섬유판으로 보강되지 않은 보에 비하여 크게 증진되며, 그 최대 증가율은 보강되지 않은 부재의 경우보다 약 247%로 나타났다. 위 철근콘크리트 부재의 파괴는 부재 길이 방향으로 섬유 소선이 풀리는 표면매입 탄소 섬유판의 파괴로 시작되며, 탄소섬유판의 파단이 이어지는 2차 파괴가 발생하였다. 표면매입 탄소섬유판은 콘크리트와의 완정한 합성거동을 유도하여 따라서 탄소섬유판을 표면에 매입하는 방식은 노후 구조물 보강방식으로 매우 효과적인 것으로 판단된다.
Donghwan Park(Donghwan Park),Kang-Seong Lee(Kang-Seong Lee) 물리치료재활과학회 2024 Physical therapy rehabilitation science Vol.13 No.1
Objective: The objective of this study was to investigate the effect of the thoracic mobility exercise program on pain, proprioception, and static balance ability in patients with non-specific chronic low back pain. Design: Randomized controlled trial design. Methods: Thirty patients with non-specific chronic low back pain participated in this study. The participants were randomized into the thoracic mobility exercise group (n=15) and the lumbar stabilization exercise group (n=15). Both groups received traditional physical therapy for 30 minutes per session. In addition, the thoracic mobility exercise group and the lumbar stabilization exercise group each exercise 3 times a week for 6 weeks. All participants were measured visual analog scale, proprioception test, and static balance ability before and after the intervention. Results: After 6 weeks of interventions, the thoracic mobility exercise group showed greater improvement in visual analog scale, proprioception test, and static balance ability than the LSE group (p<0.05). Further, the thoracic mobility exercise group had significant Enhancements in all measured variables compared to the baselinetest (p<0.05). However, the lumbar stabilization exercise group had significant improvement only visual analog scale, and static balance ability compared to the baselinetest (p<0.05). Conclusions: Our investigation demonstrates that the thoracic mobility exercise is an effective intervention method for improving pain, proprioception, and static balance ability in patients with non-specific chronic low back pain.
Effect of Kinesiology Taping for Ankle Instability in Stroke Patients
Donghwan Oh,Jaeyoung Park,Jinuk Kim 국제물리치료연구학회 2020 Journal of International Academy of Physical Ther Vol.11 No.1
Background: Ankle instability usually occurs after stroke, and contributes to unsafe walking and associated risk of falling in the affected patients. Objective: To investigate the effects of kinesiology taping (KT) on gait and balance ability (center of pressure, CoP) in patients with ankle instability after stroke. Design: One group, pre-post design. Methods: A total of 11 patients with ankle instability after stroke were enrolled. In all subjects, the gait and balance ability were assessed under 2 conditions: KT and barefoot. Gait and balance ability was assessed using GAITRite system and FDM-S platform. Results: Comparison between KT and barefoot condition, KT condition was significantly higher in velocity, cadence, step length, and stride length than barefoot condition (P<.05). KT condition was significantly lower in CoP path length and sway speed than barefoot condition (P<.05). Conclusion: KT indicated potential as a helpful method for walking and balancing ability in patients with ankle instability after stroke. Therefore, this study recommends KT as an option applicable to the stroke with ankle instability.
Donghwan Lee(이동환),Wonseok Kang(강원석) 이화여자대학교 경영연구소 2021 신산업경영저널 Vol.39 No.2
군 조직은 모병제로의 전환이슈와 신세대 장병의 유입이라는 사회변화를 직면하고 있으며, 이에 대응한 변화가 필요한 시점이다. 본 연구에서는 우수한 인적자원의 유인(Attraction) 및 유지(Retention)를 위한 방안으로 고객경험관리의 군사회복지제도의 적용을 제시하고자 하였다. 본 연구는 사례연구 기법을 적용하여 고객경험관리의 성공적인 수행을 통해 카드대란과 금융위기를 극복하고 고객으로부터 신뢰받는 기업으로 도약한 ‘삼성카드’의 고객경험관리 성공 사례를 살펴보고 이를 고객경험관리 3단계 프레임워크에 적용하여 분석하고, 체계화 하였으며, 이를 통해 최종적으로 고객경험관리를 적용한 군사회 복지의 패러다임 변화의 방향을 제시하였다. 이번 연구를 통해 학문적으로는 군사회복지에 경영학의 관점을 적용하여 두 학문을 상호보완적으로 연구했다는 점과 고객경험관리의 선행연구들에서 부족하게 연구되었던 실제 사례에 적용한 연구를 진행했다는 점, 그리고 실용적인 측면에서 병역제도의 전환이슈와 신세대 장병의 군 유입이라는 사회변화에 적응하기 위한 시의적절한 변화의 방향을 제시하였다는 점에서 그 의의가 있다. Military organizations are facing social changes such as the transition to recruitment and the influx of new generation soldiers, and it is time to change in response. For this change, this study intended to present the application of the military social welfare system of customer experience management as a way to attract and retain excellent human resources. This study examined the success cases of customer experience management of Samsung Card which overcome the card crisis and financial crisis and leap to become a trustworthy company from customers through successful performance of customer experience management by applying case study technique. In the case of Samsung Card, we analyzed and systematized the three-step framework of customer experience management, and finally presented the direction of paradigm change of military social welfare applying customer experience management. This study is meaningful in that it applied management perspective to military welfare to complement the two studies, conducted research on actual cases that were insufficiently studied in prior studies of customer experience management. Additionally, in practical terms, it is significant in that it presented a timely direction for changing the military service system to adapt to the social changes of the issue and the influx of new generation soldiers into the military.
Optimal transmission policies for MOT in T-DMB
Donghwan Lee,Jihoon Choi,Kyunghwi Kim,Wonjun Lee,Choonhwa Lee IEEE 2007 IEEE communications letters Vol.11 No.12
<P>The Multimedia Object Transfer (MOT) protocol in Terrestrial Digital Multimedia Broadcasting (T-DMB) systems inherently does not facilitate return paths in data transmission and therefore additional policies are required to envision further efficient reliable media broadcasting. This letter proposes novel optimal transmission policies for MOT standard definition in T-DMB. The proposed broadcasting policies drastically enhance the capability of conventional MOT protocol.</P>