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김호영,이윤표,Kim, Ho-Young,Lee, Yoon-Pyo 대한기계학회 2003 大韓機械學會論文集B Vol.27 No.2
Thermal bubbles find their diverse application areas in the MEMS (MicroElectroMechanial Systems) technology, including bubble jet printers, microactuators, micropumps, etc.. Especially, microactuators and micropumps, which use a microbubble growing by a controlled heat input, frequently involve mechanical and thermal interaction of the bubble with a solid structure, such as a cantilever beam and a membrane. Although the concept is experimentally verified that an internal pressure of the bubble can build up high enough to deflect a thin solid plate or a beam, the physics of the entire process have not yet been thoroughly explored. This work reports the experimental study of the growth of a thermal bubble while deflecting a thin cantilever beam. A physical model is presented to predict the elastic response of the cantilever beam based on the experimental measurements. The scaling law constructed through this work can provide a design guide for micro- and nano-systems that employ a thermal bubble for their actuation/pumping mechanism.
20d<sub>b</sub> 정착길이를 가지는 SD700 갈고리철근과 확대머리철근의 정착성능 실험
김호영,심혜정,Kim, Ho Young,Sim, Hye Jung 인천대학교 도시과학연구원 2018 도시과학 Vol.7 No.2
With the increase of the skyscraper center, the development of large-diameter and high-strength reinforcing bars is being carried out to solve the dense reinforcement. In case of the steel reinforced concrete with a small cross section such as beam-column joints, the development length becomes short when straight bars are used. Therefore, it is possible to solve the problem that the development length becomes short by using the bearing strength of the hooked bar and headed bar. In this study, the exterior beam-column joint test of SD700 hooked bar and headed bar with anchorage length of 20db was conducted to extend the development length limitation of hooked bar and headed bar. As a result of the evaluation of the anchorage strength using the design equation by KCI, the average of the [measured value]/[predicted value] ratio was 1.31 for the hooked reinforcing bars. In the case of headed bars, the average of the [measured value]/[predicted value] ratio was 1.12. In addition, in order to compare the anchorage performance of the hooked bar and the headed bar, the measured values were divided by the square root of the compressive strength of the concrete to compare the anchorage strength. Under the same conditions, the anchorage strength of headed bars was 8.5% higher than the hooked bars.
백내장 수술 후 후낭혼탁 발생 억제에 대한 트라닐라스트의 유용성
김호영,이헌일,전연숙,김재찬,Ho Young Kim,Hyeon Il Lee,Yeoun Sook Chun,Jae Chan Kim 대한안과학회 2008 대한안과학회지 Vol.49 No.12
Purpose: To evaluate the inhibitory effect of tranilast on the formation of posterior capsular opacity (PCO) after a cataract operation ex vivo and in a rabbit model. Methods: A human lens epithelial cell line (B3) was treated with 0.005-0.1 mM tranilast. Cytotoxicity assessment and effective dosage determination of tranilast were performed using MTT assays. B3 cell lines were cultured in Eagle's minimal essential medium (EMEM) containing 20% FBS with different concentrationsof tranilast, and morphological differences were observed. To investigate the effect of tranilast on cytokine production in B3 cell lines, cells were treated with 0.01 mM tranilast and expression profiles of cytokines were analyzed by RT-PCR. After performing phacoemulsification and intraocular lens implantation in 10 white rabbits, 0.5% tranilast eye drops were given 4 times per day, and the severity of PCO was evaluated bi-weekly using POCOman for 8 weeks after the operation. Results: Cell death was observed in the 0.05 mM tranilast-treated B3 cell lines, and inhibition of epithelial- mesenchymal transition (EMT) was also observed in the 0.01 mM tranilast-treated B3 cell lines. TGF-β1/2, IL-18, and CDK7 mRNA expression decreased in the 0.01 mM tranilast-treated B3 cell lines. Significant suppression of PCO formation was observed in rabbits treated with 0.5% tranilast eye drops 5 weeks post operative (p<0.05). Conclusions: The results from this study show that tranilast suppresses EMT through inhibition of TGF-β, IL-18,and CDK7 expression. The results suggest that tranilast can be used toprevent PCO formation after cataract surgery.
박건중(Kun Joong Park),이덕규(Duck-Gyu Lee),김호영(Ho-Young Kim) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.5
Water strider legs, capable of enduring much heavier load than their body weight, are flexible. As a model for the legs, we study how floating flexible sheets in static equilibrium are deformed by hydrostatic pressure and surface tension using the linear theory of elasticity and the Young-Laplace equation. We also consider the maximum load supported by the sheets. The predictions agree well with experimental measurements.
김호영 ( Ho Young Kim ),어지안 ( Ji An Uh ),김중호 ( Joong Ho Kim ),이재호 ( Jae Ho Lee ),이수경 ( Soo Kyung Lee ),김명신 ( Myoung Shin Kim ),이운하 ( Un Ha Lee ) 대한피부과학회 2021 대한피부과학회지 Vol.59 No.2
Hand-foot-mouth disease (HFMD) is a viral infection that occurs commonly in children. It is characterized by vesicles with surrounding erythema on the extremities and mouth. Most common pathogens are Coxsackievirus A16 and Enterovirus 71. HFMD caused by Coxsackievirus A6 is uncommon and accompanied by more extensive and atypical eruptions. A 42-year-old man presented with erythematous papules and vesicles on the right hand which occurred 7 days prior to presentation. The rash spread extensively with high fever, chills, headache, and myalgia. He also had whitish ulcer-like lesions on the oral mucosa with swallowing difficulty. One day after hospitalization, he developed arthralgia on his shoulders, pelvis, knees, and fingers. The biopsy specimen showed an intraepidermal blister with reticular degeneration, epidermal necrosis, and neutrophilic infiltration. There were no inclusion cells or giant cells. The serum antibody titer of Coxsackievirus A6 showed a significant increase, at 64 times. He was diagnosed with HFMD caused by Coxsackievirus A6. (Korean J Dermatol 2021;59(2):132∼135)
더모스코피 소견상 선상출혈을 동반한 가와사키병의 주황색 색소조증 1예
김호영 ( Ho Young Kim ),김중호 ( Joong Ho Kim ),이재호 ( Jae Ho Lee ),서중헌 ( Joong Heon Suh ),이수경 ( Soo Kyung Lee ),김명신 ( Myoung Shin Kim ),이운하 ( Un Ha Lee ) 대한피부과학회 2020 대한피부과학회지 Vol.58 No.9
Kawasaki disease is an acute inflammatory syndrome affecting middle-sized arteries. It is diagnosed when a fever lasts longer than 5 days, and four out of the five diagnostic criteria are satisfied. Some skin lesions are not included in the criteria, but are associated with Kawasaki disease. They can be helpful when the patient has an incomplete presentation. Herein, we report a Kawasaki patient who presented with simultaneous orange-brown chromonychia on all 20 nails and black crusted lips. (Korean J Dermatol 2020;58(9):614∼616)