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연영모 ( Yeon Yeong Mo ),홍기남 ( Hong Ki Nam ),이수규 ( Lee Su Gyu ) 한국구조물진단유지관리공학회 2017 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.21 No.2
In this paper, the bond stress of Fe based Shape Memory Alloy(Fe-SMA) with near surface mounted strengthening was investigated. An lab-shear test using Fe-SMA strips glued with cementitious matrix was performed to evaluate bond stress. Bond length (250 mm, 350 mm, 450 mm) was considered as experimental variable. The bond stress and utilization of Fe-SMA are 1.487MPa and 80%, respectively, at the bond length of 450 mm.
순산소연소 조건에서 석회석의 소성특성 및 로내탈황에 관한 연구
안영모(Young Mo An),조항대(Hang Dae Jo),최원길(Won Kil Choi),박영성(Yeong Sung Park),길상인(Sang In Keel),이형근(Hyung Keun Lee) 大韓環境工學會 2009 대한환경공학회지 Vol.31 No.5
순산소연소 배가스 중 CO₂ 농도는 가스의 재순환으로 인해 95%까지 농축 가능하며, CO₂ 농도가 높은 조건에서 석회석의 소성특성은 기존의 공기 연소와 다르게 나타난다. 본 연구에서는 흡수제로 특성이 다른 세 종류의 국내산 석회석을 이용하여, 소성온도에 따른 석회석의 소성특성에 대해 알아보았다. 또한 흡수제 종류, 반응온도 등의 운전변수가 SO₂ 제거효율에 미치는 영향에 대하여 알아보고, 반응생성물을 포집하여 황 함량을 측정하였다. 소성온도가 증가함에 따라 석회석의 소성율 및 비표면적은 증가하는 경향을 보였으며, 반응온도가 증가함에 따라 SO₂ 제거효율은 증가하였으며 석회석의 종류에 따라 SO₂ 제거효율이 뚜렷한 차이를 보였다. 최고효율 나타낸 석회석 시료에 대한 반응생성물 분석결과 시료 내 황 함량은 약 10% 정도인 것으로 나타났다. In oxy-fuel combustion, CO₂ concentration in the flue gas may be enriched up to 95% owing to the gas recirculation. Under the high CO₂ concentration, the calcination characteristic of limestone is different from that of the conventional air combustion system. In this study, three types of limestone taken from different regions in Korea were used as SO₂ absorbent and their calcination characteristics depending on calcination temperature were investigated. The experiments were performed to examine the effects of operating variables such as absorbent species, reaction temperatures on the SO₂ removal efficiency and reacted limestone particles were captured to examine the sulfur contents. The degree of calcination and the specific surface area increased with calcination temperature and SO₂ removal efficiency increased with reaction temperature. The results showed remarkable difference in SO₂ removal efficiencies between the limestone types. The sulfur content of the reacted limestone with the highest SO₂ removal efficiency was about 10%.
고용량의 Dexamethasone 존재하에서 골막기원세포에서 발현되는 혈관신생인자의 평가
박봉욱,최문정,류영모,이성균,하영술,김덕룡,조영철,김종렬,변준호,Park, Bong-Wook,Choi, Mun-Jeong,Ryu, Young-Mo,Lee, Sung-Gyoon,Hah, Young-Sool,Kim, Deok-Ryong,Cho, Yeong-Cheol,Kim, Jong-Ryoul,Byun, June-Ho 대한악안면성형재건외과학회 2008 Maxillofacial Plastic Reconstructive Surgery Vol.30 No.3
Angiogenesis plays an important role in bone development and postnatal bone fracture repair. Vascular endothelial growth factor (VEGF) and vascular endothelial growth factor receptors (VEGFRs) have been thought to be primarily involved in promoting angiogenesis. It is well known that VEGF and its receptors have been reported to play an important role in the regulation of the interaction between angiogenesis and osteogenesis during bone repair processes. Dexamethasone, a potent synthetic glucocorticoid, promotes phenotype markers of osteoblast differentiation, such as ALP and osteocalcin. It stimulates in vitro osteogenesis of human bone marrow osteogenic stromal cells. Dexamethasone has been reported to suppress VEGF gene expression in some cells. However, our previous study demonstrated VEGF quantification increased in a time-dependent manner in periosteal-derived osteogenesis under dexamethasone. So, the purpose of this study was to examine the angiogenic phenotypes in cultured human periosteal-derived cells under high-dose dexamethasone. Periosteal-derived cells were cultured using a technique previously described. After passage 3, the periosteal-derived cells were further cultured for 28 days in an osteogenic inductive culture medium containing ascorbic acid, ${\beta}$-glycerophosphate and high-dose dexamethasone, We evaluated the expression of VEGF isoforms, VEGFR-1, VEGFR-2, and neuropilin-1, ALL VEGF isoforms ($VEGF_{121},\;VEGF_{165},\;VEGF_{189}$, and $VEGF_{206}$) expression was observed by RT-PCR analysis. VEGFR-1, VEGFR-2 and neuropilin-1 expression increased up to day 14, particularly during the early stage of mineralization. Our results suggest the involvement of direct VEGFs/VEGFRs system on periosteal-derived cells during early mineralization phase under high-dose of dexamethasone. These also suggest that VEGF might act as an autocrine growth molecule during osteoblastic differentiation of cultured human periosteal-derived cells.
버섯 폐배지의 연료화 및 품질개선을 위한 반탄화 최적화 연구
이창구 ( Chang-goo Lee ),최병훈 ( Byeong-hoon Choi ),구영모 ( Yeong-mo Koo ),강석구 ( Seog-goo Kang ) 한국목재공학회 2022 한국목재공학회 학술발표논문집 Vol.2022 No.2
This study was conducted as part of the purpose of realizing the fuelization and quality improvement using spent mushroom substrate through a torrefaction pretreatment. Conditions of torrefaction pretreatment were performed at temperatures of 250, 350, and 450°C and reaction times of 600, 1,200, and 1,800s, respectively. In order to confirm the fuel characteristics were conducted to proximate analysis and higher heating value. As the experimental materials, to determine the tendency of spent mushroom substrate according to the cultivation period of Letinula edodes, the products discarded after harvesting 2, 4, 6 and 8 cycles were used. As a result, higher heating value and content of fixed carbon has been increased and contents of moisture content and ash has been decreased the more torrefaction pretreatment for temperature and time increased. Furthermore, the results of calculating the energy yield through the higher heating value and the mass yield, it found that most suitable for molded charcoal of the manufacturing a conditions of 1,200-1,800s of 350°C in this study.
양철오(Chul-Oh Yang),이대성(Dae-Sung Lee),오민석(Min-Suk Oh),박희진(Hee-Jin Park),구영모(Young-Mo Koo),배영환(Yeong-Hwan Bae),송명현(Myung-Hyun Song) 대한전기학회 2010 대한전기학회 학술대회 논문집 Vol.2010 No.7
3축 가속도 센서를 이용해 이동하는 물체의 자세각을 측정할 때 물체의 이동으로 가속도가 발생하므로 이로 인한 오차가 발생한다. 본 연구에서는 이동하는 물체의 가속도에 의한 측정 오차를 줄일 수 있는 물체의 자세각 측정 방법을 제안하였다. 직선 운동하는 리니어 스테이지에 가속도 센서를 고정시켜 실험함으로써, 종래의 방법과 제안한 방법에 의한 측정 결과를 비교하였다.