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나노펄스 플라즈마를 이용한 탈황 시스템의 H<sub>2</sub>O 및 NH<sub>3</sub>, 펄스 인가전압에 따른 입자변환 분석
김영훈,신동호,이건희,홍기정,김학준,김용진,한방우,황정호,Kim, Younghun,Shin, Dongho,Lee, Gunhee,Hong, Keejung,Kim, Hak-Joon,Kim, Yong-Jin,Han, Bangwoo,Hwang, Jungho 한국입자에어로졸학회 2020 Particle and Aerosol Research Vol.16 No.1
Nano-pulse plasma technology has great potential as the process simplicity, high efficiency and low energy consumption for SO<sub>2</sub> removal. The research on the gas-to-particle conversion is required to achieve higher efficiency of SO<sub>2</sub> gas removal. Thus, we studied the effect of the relative humidity, NH<sub>3</sub> concentration and applied voltage of the nano-pulse plasma system in the gas to particle conversion of SO<sub>2</sub>. The particles from the conversions were increased from 10 to 100 nm in diameter as relative humidity, NH<sub>3</sub> concentration, applied voltage increases. With these results, nano-pulse plasma system can be used to more efficient removal of SO<sub>2</sub> gas by controlling above parameters.
Lumbar Interbody Fusion and Osteobiologics for Lumbar Fusion
김영훈,Ha Kee-Yong,Kim Youn-Soo,Kim Ki-Won,Rhyu Kee-Won,Park Jong-Beom,Shin Jae-Hyuk,Kim Young-Yul,Lee Jun-Seok,Park Hyung-Youl,Ko Jaeryong,Kim Sang-Il 대한척추외과학회 2022 Asian Spine Journal Vol.16 No.6
Lumbar interbody fusion (LIF) is an excellent treatment option for a number of lumbar diseases. LIF can be performed through posterior, transforaminal, anterior, and lateral or oblique approaches. Each technique has its own pearls and pitfalls. Through LIF, segmental stabilization, neural decompression, and deformity correction can be achieved. Minimally invasive surgery has recently gained popularity and each LIF procedure can be performed using minimally invasive techniques to reduce surgery-related complications and improve early postoperative recovery. Despite advances in surgical technology, surgery-related complications after LIF, such as pseudoarthrosis, have not yet been overcome. Although autogenous iliac crest bone graft is the gold standard for spinal fusion, other bone substitutes are available to enhance fusion rate and reduce complications associated with bone harvest. This article reviews the surgical procedures and characteristics of each LIF and the osteobiologics utilized in LIF based on the available evidence.
Bayesian Reliability Estimation for the Rayleigh Distribution
김영훈,손중권,Kim, Yeung-Hoon,Sohn, Joong-K. The Korean Data and Information Science Society 1993 한국데이터정보과학회지 Vol.4 No.-
This paper deals with the problem of estimating a reliability function for the Rayleigh distribution. Using the priors about a reliabity of real interest some Bayes estimators and Bayes credible sets are proposed and studied under squared error loss and Harris loss.
김영훈,이선경,Kim, Yung-Hoon,Lee, Sun-Kyoung 대한치과기공학회 2010 대한치과기공학회지 Vol.32 No.4
Purpose: This study was performed to compare sintering conditions for fabrication of porous Ti implant. Methods: The porous Ti implant samples were fabricated by sintering of spherical Ti powders in vacuum and atmosphere conditions. Surface morphology, composition and phase were analyzed by FE-SEM, EDX and XRD. Results: Sintered Ti implant in the vacuum consisted of particles connected in three dimensions by clear necking without excessive oxide layers. However, sintered Ti implant in atmosphere was formed excessive oxide layers with non-stoichiometric compounds. Conclusion: The porous Ti implant can be sintered in vacuum condition preferably.
헬리컬 핀 구조를 가진 LED 조명용 히트싱크의 열 특성
김영훈,임해동,오범환,Kim, Young-Hoon,Yim, Hae-Dong,O, Beom-Hoan 한국광학회 2014 한국광학회지 Vol.25 No.6
본 논문에서는 LED 모듈의 방열성능을 개선하기 위하여 히트싱크의 새로운 핀 구조를 설계하고 열 특성을 분석하였다. 대부분의 히트싱크는 판상형이나 침상형의 핀으로 구성되는 것이 일반적이나, 스프링 모양의 헬리컬 핀 구조를 설계변수와 함께 도입하여 제한된 부피 대비 넓은 표면적을 갖는 히트싱크를 설계하였다. 약 14% 넓어진 표면적을 통해 방열 효율을 개선하였고, 그에 따라 LED 칩의 온도를 약 12% 정도 저감하는 효과를 가져 올 수 있었다. 또한, 기존의 히트싱크 보다 넓은 표면적을 가지는데 비해 형성 부피는 약 15% 감소하게 되어 재료비 절감은 물론 공정상의 이점에 따른 공정 생산비의 절감을 기대할 수 있는 새로운 고성능 LED 조명용 히트싱크를 설계하였다. In this paper, we design a helical fin structure for the heat sink for a high-power LED lighting module, and analyze its thermal properties. By means of the helical fin structure, we can obtain about 14% larger surface area for the limited volume and it can decrease the LED chip temperature by about 12%. Because this helical fin heat sink has 15% less total volume than a conventional one, we can also expect to reduce the production cost due to these structural properties.
김영훈,이영준,정규림,박영국,Kim, Young-Hun,Lee, Young-Jun,Chung, Kyu-Rhim,Park, Young-Guk The Korean Association Of Orthodontists 2000 대한치과교정학회지 Vol.30 No.6
골세포는 골대사에 영향을 미치는 다양한 성장인자와 싸이토카인을 생성하여 골 기질로 유리시킨다. 이 연구는 쥐의 장골 세포 배양 모델에서 recombinant human IL-$1\beta$가 $PGE_2$ 합성과 plasminogen activator의 활성 조절을 통한 골 흡수 유도 기전의 일단을 구명하고, 이와 동시에 TGF-$\beta$에 의한 골흡수 억제 기전을 해명하는데 그 목적이 있다. 쥐의 장골 세포를 배양하여 통법의 골모세포 phenotype을 발현하는 세포를 분리하고 세포 배양능, alkaline phosphatase assay, PG assay, 골흡수능 측정들을 시행하여 다음의 결과를 얻었다. 1. IL-$1\beta$는 쥐의 골모세포의 증식, $PGE_2$ 생성 및 palsmonogen activator의 활성을 촉진하였다. 2. IL-$1\beta$는 쥐의 골모세포에서의 alkaline phosphatase 활성을 감소시켰다. 3. rhIL-$1\beta$는 골 흡수를 촉진시켰다. 4. TGF-$\beta$는 쥐의 장골 세포에서 골의 흡수를 억제하였으며, Vitamin $D_3$에 의하여 유도된 골 흡수를 억제하였다. 이상의 연구 결과는 IL-$1\beta$에 의한 골 파괴의 병인과 관련하여 골 세포 대사의 병리학적 조절에 있어서의 IL-$1\beta$의 역할을 지지하며, 이와 동시에 골 흡수 억제에 있어서의 TGF-$\beta$의 역할을 확인시켜주는 것으로 생각된다. Bone cells produce multiple growth factors and cytokines that have effects on bone metabolism and can be incorporated into the bone matrix. The present study was designed to extend these observations by examining the interactions between transforming growth factor-$\beta$(TGF-$\beta$) or interleukin-$1\beta$(rhIL-$1\beta$) and bone cells in a rat long bone culture model. IL-$1\beta$ regulates several activities of the osteoblast cells derived from rat long bone explants in vitro. IL-$1\beta$ stimulated cellular proliferation as well as the synthesis of prostaglandin $E_2$ and Plasminogen activator activity in the cultured cells in a dose-dependent manner. TGF-$\beta$ is present in the bone matrix and potentially released during bone resorption. TGF-$\beta$ reduced basal bone resorption and inhibited vitamin $D_3[1,25(OH)_2D_3]$-induced bone resorption in rat long bone cells. These results support the role of IL-$1\beta$ in the pathological modulation of bone cell metabolism, with regard to implication in the Pathogenesis of osteoporosis by IL-$1\beta$, and that TGF-$\beta$ positively inhibits the bone resorption.
필리핀 스페인 식민지 양식 바하이 나 바토(Bahay na bato)의 버내큘러 건축 특성에 관한 연구
김영훈,임수영,Kim, Young-Hoon,Lim, Sooyoung 한국생태환경건축학회 2013 한국생태환경건축학회 논문집 Vol.13 No.4
Philippines, having the unique combination between its traditional and vernacular culture and European culture during colonization by Spain over three hundred years, shows the variations of style and scale in domestic architectures. Bahay na bato, one of the typical house of recent stone house in Philippines, has been completed referring traditional bahay kubo and Spanish stone built house, adapting vernacular principles in traditional house and new Spanish culture and life styles. Especially, vernacular for climates, earthquakes, social and cultural conditions, environment and materials in traditional bahay kubo still alive in bahay na bato mingled with spanish architectural technology and culture. This study place emphasis on the vernacular characteristics in bahay na bato by considering the climate control method in traditional house and Spanish influences on Philippines house.