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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.
Donghwan Kim(김동환) 한국자동차공학회 2020 한국자동차공학회 학술대회 및 전시회 Vol.2020 No.11
Many studies are being conducted on technologies directly related to the commercialization of automated driving vehicles and the enactment of related laws. Other side studies, however, are insufficient. In particular, automated driving vehicles do not need to drive, so they expect to do various indoor activities, unlike conventional vehicles. In this paper, we would like to collect existing research data and predict and analyze the various activities of passengers expected from automated driving vehicles, investigate and analyze the functions and arrangement of passenger plane and ship seats as well as current vehicle seats, and propose the functions and arrangement of seats required by automated driving vehicles.
Donghwan Kim,Sook Shin 한국환경생물학회 2015 환경생물 : 환경생물학회지 Vol.33 No.2
Some euryalid specimens were collected with fishing nets from Mipo, Gyungsangnamdo and Aewol, Jejudo Island, Korea. They were identified as Gorgonocephalus eucnemis (Müller & Troschel, 1842), belonging to family Gorgonocephalidae of order Euryalida, which was new to the Korean fauna. Their molecular analyses were done with newly intended COI primers of mitochondrial cytochrome oxidase I (COI) gene for the accurate molecular identification. The Korean G. eucnemis was coincident with this NCBI species as a result of Blast analysis, which showed the 99% similarity. In the current study, three Gorgonocephalus species have been reported from Korea.
Donghwan Kim(김동환),문병석,노원우,박보인 한국고분자학회 2021 한국고분자학회 학술대회 연구논문 초록집 Vol.46 No.2
In this study, we suggest that precise control of temperature and synthesis time, along with maintenance of a consistent synthesis temperature that does not fluctuate, are important keys to obtain high crystalized and high monodispersed hexagonal β-NaYF₄ : Yb<SUP>+3</SUP>/Er<SUP>+3</SUP> UCNP colloidal. In addition, it was confirmed that the range of synthesis conditions that can obtain high mono-dispersity varies depending on the selection of the precursor. Two types of metal salts, acetate and chloride series, were used as precursors. Clear, transparent, and well-dispersed colloidal were obtained under diverse synthesis conditions when synthesized with the acetate series. Moreover, the dispersion stability of UCNP colloids prepared with elaborately optimized conditions persisted for up to 3 months. We believe that the results of this study could be a more accessible navigation to researchers working in the fields related to the synthesis of NaYF4:rare-earth ions UCNP colloidal.