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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.
Corrosive Esophagitis and Gastritis Induced by Glutaraldehyde Ingestion
Donghwan Jun,Hye-Jin Kim,Hyun Suk Lee,Hong Jip Yoon,박재용,Beom Jin Kim,김재규 대한상부위장관ㆍ헬리코박터학회 2020 Korean Journal of Helicobacter Upper Gastrointesti Vol.20 No.3
Corrosive esophagitis and gastritis are characterized by caustic damage due to ingestion of chemical agents. Caustic agents cause tissue destruction through liquefaction or coagulation reactions. Here, we report a case of corrosive esophagitis and gastritis caused by accidental ingestion of glutaraldehyde in Korea. A 62-year-old man presented to the emergency department 8 hours after ingesting glutaraldehyde, which is widely used for the prevention of foot-and-mouth disease in pigs. Urgent endoscopic examination revealed severely damaged mucosae of the esophagus and stomach. With conservative treatment, the patient’s condition was improved, and he was discharged on the 35th day of admission.
Numerical modeling and simulation technique in time-domain for multibeam echo sounder
Donghwan Jung,Jeasoo Kim,Gihoon Byun 대한조선학회 2018 International Journal of Naval Architecture and Oc Vol.10 No.2
A Multibeam Echo Sounder (MBES) is commonly used for rapid seafloor mapping. We herein present a time-domain integrated system simulation technique for MBES development. The Modeling and Simulation (M&S) modules consist of four parts: sensor array signal transmission, propagation and backscattering modeling in the ocean environment, beamforming of the received signals, and image processing. Also, the simulation employs a ray-theory-based algorithm to correct the reconstructed bathymetry, which has errors due to the refraction caused by the vertical sound velocity profile. The developed M&S technique enables design parameter verification and system parameter optimization for MBES. The framework of this technique can also be potentially used to characterize the seabed properties. Finally, typical seafloor images are presented and discussed.
Hydrothermal carbonization of lipid extracted algae for solid fuel production
( Donghwan Sohn ),( Jongkeun Lee ),( Junhee Ryu ),( Youngho Park ),( Sungwan Cho ),( Ki Young Park ) 한국폐기물자원순환학회(구 한국폐기물학회) 2019 한국폐기물자원순환학회 심포지움 Vol.2019 No.1
As the microalgae are used as the third generation biomass, the area of cultivation is narrow and the growth is fast, so much research is being conducted for the production of biodiesel. During biodiesel production, lipid extracted algae (LEA) is generated from the algal biodiesel production industries. The LEA residue, after the extraction of lipid, is commonly considered as waste. The objective of this study is to produce alternative solid fuels from LEAs via HTC process as a method of bio-carbon recovery and waste disposal. In this study, feedstocks were used LEA form Chlorella vulgaris were extracted by Dimethyl Ether (DME), and untreated C. vulgaris. Experiments were performed using a lab-scale reactor with a volume of 1 L, into which 300mL of LEA or C.vulgaris feedstock, mixed with an equal amount of distilled was water loaded. The anaerobic condition was achieved by purging the reactor with nitrogen gas for sufficient time before the HTC experiments. The operating temperature ranged between 180 to 270℃ with the reaction being maintained for 30 min in the presence of subcritical water. The contents of the reactor were mixed vigorously using an agitator, rotating at 200 rpm. After the HTC treatment, the residual steam was discharged from the reactor. The reaction time, as a result, the carbon contents of LEA and microalgae increased from 47.16% to 58.45% and from 50.91% to 59.36%, respectively, as the treatment temperature increased until 210℃. Also, the calorific value was also increased, indicating the highest value of 6,594 kcal/kg and 6,800 kcal/kg at 210℃. LEA has low carbon content and calorific value compare with C.vulgaris, but it has enough high carbon content and calorific value for using solid fuel. In addition, the characteristics of solid fuel of LEA are enhanced by HTC, and the product may be sufficient to use solid fuel.
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.