[신진연구자 소개] 김호영 Ho-Young Kim

김호영(Ho-Young Kim) 한국콘크리트학회 2019 콘크리트학회지 Vol.31 No.6

20d_b 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.

열 기포에 의한 고체 박막의 변형 해석

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.

물 위에 뜬 소금쟁이 다리의 탄성 변형

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.

산업기술 R&D 투자의 고용창출효과 분석

김호영(Ho-Young Kim),어승섭(Seung-Seob Euh),전영두(Young-Doo Jun),유승훈(Seung-Hoon Yoo) 한국기술혁신학회 2014 기술혁신학회지 Vol.17 No.4

최근 정부는 고용률 저조로 인한 저성장세의 고착화가 우려됨에 따라 창조적이고 혁신적인 R&D 활동을 통한 신규 고용창출을 중요한 국정목표 중 하나로 삼고 있다. 본 논문에서는 산업연관분석을 적용하되 가장 최근에 발표된 2011년도 산업연관표를 이용하여 정부 산업기술 R&D 투자의 고용창출효과를 분석하고자 한다. 여기서 고용창출효과는 직접고용효과와 고용유발효과로 분해된다. 산업기술 분야를 대분류 기준 총 7개로 구분하여 분석한 결과, 산업기술 R&D 투자액 10억원당 고용창출효과는 8-12명인 것으로 분석되었다. 지식서비스 기술분야의 고용창출효과가 큰 것으로 나타난 반면에, 전기?전자기술분야는 고용창출효과가 상대적으로 낮았다. 고용창출 우위기술에 속하는 바이오?의료 기술분야와 직접고용 우위기술에 속하는 지식서비스, 화학, 에너지?자원 기술 분야에 대한 선택과 집중을 통해 단기적으로 고용창출의 견인차 역할을 할 필요가 있다. 고용유발 우위기술에 속하는 정보통신, 기계?소재 기술분야는 산업간 파급효과를 통한 중장기적 고용창출 효과가 중요하기 때문에 기술이전, 개방형혁신 등을 통해 기술 확산에 주력하는 전략이 필요하다. 이상의 결과는 산업기술 R&D 투자의 고용창출효과를 진단하고 예측하는 데 참고자료로 활용할 수 있을 것이다. Under the diagnosis of low employment rate and low growth, the government regards the creation of new jobs through the creative and innovative R&D as an important national plans. This study attempts to measure the employment creation effect of R&D investment of industrial technology by using input-output analysis used in domestic and international broadly. The employment effect can be divided into employment inducement effect and direct employment effect. As a result of the analysis, The employment creation effect of R&D investment of government industrial technology is measured to be 8-12 peoples per 1 billion KRW investment. This results mean that government R&D investment is a effective policy for employment creation. And it is necessary to establish R&D policies that reflect the technical characteristics of the employment creation effect. In short term, it is important that the government invest the superior technology of total employment and direct employment as essential means of employment creation by selection and concentration strategy. In mid-long term, the government should focus on technology spread as technology transfer and opening innovation strategy for employment creation to support superior technology of employment inducement. The results of this study can be used in analysis on the employment creation effect related to industrial technology R&D.

시설물 생애주기 설계 안전성 검토(DfS) 체계 구축에 관한 연구 - 유지관리 업무 중심으로 -

김호영 ( Kim¸ Ho-young ),장영태 ( Jang¸ Young-tae ),권혁수 ( Kwon¸ Hyug-soo ) 한국구조물진단유지관리공학회 2023 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.27 No.2

최근 건설업계의 가장 큰 경영화두는 “안전”이다. 정부는 최근 몇 년간 산업안전보건법 및 건설기술진흥법 개정으로 건설안전 관련 법령을 대폭 강화하였다. 하지만 정부는 산업재해율이 크게 개선될 조짐이 보이지 않자 중대재해 발생 시 고용주를 직접 처벌하는 중대재해처벌법까지 제정하게 되었다. 이에 따라,국가 주요 기반시설의 발주를 담당하는 공공기관은 앞다투어 추가적인 안전관리 강화 조치를 쏟아내고 있다. 하지만,동시에 그간 쌓였던 건설업계의 불만도 같이 터져 나오고 있다. 이러한 조치는 결국 추가적인 시간과 비용을 수반하여 부담으로 작용할 수 밖에 없기 때문이다. 이에따라,현장 중심의 안전관리 한계를 극복하고 보다 근원적인 위해요소를 제거할 수 있는 설계단계 안전성 검토 (DfS,Design for Safety)의 필요성 및 체계구축 방안에 대하여 논하고자 한다.

HVDC를 통한 전압 안정도 향상방안 연구

김호영(Ho-Young Kim),김문겸(Mun-Kyeom Kim) 대한전기학회 2014 대한전기학회 학술대회 논문집 Vol.2014 No.7

태양광 발전 연계 시 V2G를 활용한 전력품질 향상에 관한 연구

김호영(Ho-Young Kim),김지수(Ji-Soo Kim),신광수(Gwang-Su Shin),김철환(Chul-Hwan Kim) 대한전기학회 2021 대한전기학회 학술대회 논문집 Vol.2021 No.4

The penetration of renewable energy is increasing to cope with climate change, but there is a possibility that voltage quality may deteriorate due to Photo-Voltaic(PV) which has intermittent output. Recently, development of bi-directional charging/discharging technology allows electric vehicles to transmit their storage power to the grid, which is called Vehicle-to-Grid(V2G) technology. V2G can mitigate voltage quality degradation due to PV by balancing difference between PV generation and load of peak time. In this paper, the voltage quality degradation caused by the output of PV generation is identified in the IEEE 13 bus test system and improved by using V2G technology.

차량 유한요소모델의 용접 잔류응력 평가

김호영(Ho-Young Kim),김현규(Hyun-Gyu Kim) 대한기계학회 2018 대한기계학회 춘추학술대회 Vol.2018 No.4