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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.
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.
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.
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.
분산형 전원 저압 배전계통 연계 기술기준 규정에 관한 연구
김호영(Ho-Young Kim),김지수(Ji-Soo Kim),송진솔(Jin-Sol Song),신광수(Gwang-Su Shin),조남훈(Nam-Hun Cho),김철환(Chul-Hwan Kim) 대한전기학회 2021 대한전기학회 학술대회 논문집 Vol.2021 No.10
This paper proposes a new technical standard for the interconnection of distributed generation to the low voltage distribution system. In this method, by simply calculating the voltage profile of the low voltage distribution system to which the distributed generation is connected it can be determined whether the distributed generation can be connected more accurately than the standard method. The proposed method is verified by comparing it with the Electromagnetic Transients Program (EMTP).
Forward-Backward Sweep Method를 활용한 분산전원 연계 가능 여부 평가 Tool 개발에 관한 연구
김호영(Ho-Young Kim),김지수(Ji-Soo Kim),송진솔(Jin-Sol Song),신광수(Gwang-Su Shin),김철환(Chul-Hwan Kim) 대한전기학회 2021 전기학회논문지 Vol.70 No.8
Reducing greenhouse gas emissions is essential to deal with climate change and the Paris Climate Change Accord was adopted in 2015. Net-Zero means that the actual carbon emissions will be zero by equalizing emissions and absorption, and South Korea has declared that it will achieve Net-Zero by 2050. To achieve Net-Zero, renewable energy sources are increasing, and Photo Voltaic(PV) accounts for a high proportion. However, in order to interconnect PV to the power system, there should be no adverse effects such as reverse power and overvoltage. The capacity of PV that can be connected without adversely affecting the power system is called Hosting Capacity(HC). In this paper, we check for reverse power flow, overvoltage, steady-state voltage fluctuation rate and calculate HC through Forward-Backward Sweep method.
기계적 연마 전처리가 인산망간 피막의 윤활 특성에 미치는 영향
김호영(Ho-Young Kim),노영태(Young-Tai Noh),전준혁(Jun-Hyuck Jeon),강호상(Ho-Sang Kang) 한국표면공학회 2019 한국표면공학회지 Vol.52 No.6
In this study, the effect of mechanical polishing of carbon steel on the tribological properties of manganese phosphate coating on carbon steel has investigated. The microstructure, surface morphology and chemical composition were analyzed by SEM, EDS, and XRD. The surface roughness test was carried out in order to calculate Rvk value by 3D laser microscopy. Also, the tribology property of manganese phosphate coating was tested by ball-on disk. In the results of EDS analysis, coating layer consists of elements such in Mn, P, Fe, and O. XRD showed that (Mn,Fe)₅H₂(PO₄)₄·₄H₂O in manganese phosphate coating layer was formed by the chemical reaction between manganese phosphate and elements in carbon steel. As the mechanical polishing degree increased, the friction coefficient was reduced. The rougher the mechanical polishing degree, the better corrosion resistance was obtained.
공기현가장치용 무급유 왕복동 공기 압축기의 성능실험 및 시뮬레이션
김호영(Ho Young Kim),이용호(Yong Ho Lee),김현진(Hyun Jin Kim) 한국유체기계학회 2007 유체기계 연구개발 발표회 논문집 Vol.- No.-
Numerical simulation has been made on the performance of an oil free air compressor for automotive electronic air suspension system. Calculation results on the flow rate at various air supply pressures were reasonably well compared to the experimental data. For cylinder pressure, good agreement was obtained between the calculated and measured pressure signals for the suction, compression and expansion processes. During the discharge process, however, over-compression loss in the measurement appeared to be larger than that of calculation.