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사영 기하학을 이용한 3차원 계측 시스템의 교정방식에 관한 연구
盧度煥,崔成求 全北大學校 1994 論文集 Vol.37 No.-
The 3-dimensional measurement using stereopsis system must achieve a camera calibration. So far, the 3-dimensional calibration technique that uses two-dimensional grid paper and the non-linear least square method has been developed and tested. But this method is inefficient because it has many calculation procedures and difficulty with analysis by a non-linear. Therefore, this paper proposes the projective geometric method which produces the calibration parameter by vanishing point. The vanishing point is producted by a cross ratio and parallel line pairs. The results of the computer simulation show utility of the proposed method.
Aluminum Isoproxide의 합성과 그 Sol의 특성
홍성수,이환홍,노재성,조헌영 忠南大學校 産業技術硏究所 1991 산업기술연구논문집 Vol.6 No.2
Aluminum isoproxide was synthesized by aluminum and isoproplyl alcohol and hydrolyzed to make alumina sol. The collodial stability of alumina sol was evaluated by measuring zeta potential. A high purity aluminum isoproxide(>99%) was obtained from aluminum powder, foil and flake. The particle size of aluminum powder was smaller than 250㎛ to obtain 80% yield and up within 6 hours reaction time. The alumina sol was highly stabilized in the presence of acid medium at a hydrolysis condition of pH 3 and water/alkoxide=150 at 65℃. The particle size of alumina powder was mostly under l㎛ after sintering at 1200℃ for 1 hours.
탄소섬유와 석면을 보강한 시멘트 복합재료의 압축, 인장 및 휨 강도에 관한연구
이환홍,박종서,김광섭,노재성 忠南大學校 産業技術硏究所 1990 산업기술연구논문집 Vol.5 No.1
This study was carried out to examine the reducing ability of asbestos quantity added in asbestos reinforced cement composite(ARC). The using amount of asbestos is subject to restriction from 10-20 vol% to 5-10 vol%,because it is very harmful cancerogenic substance. Asbestos was replaced by pitch based isotropic carbon fiber, and then the mechanical properties, compressive, tensile and flexural strengths were tested as a function of mixing proportions. The results are as follows 1) The compressive strength of carbon fiber and asbestos reinforced cement composite(CFARC) was greater than ARC by superplasticizer, reducingW/C ratio to 20 percent. 2) The tensile strength of CFARC was showed increasing trend up to 52% compared to ARC at 5% carbon fiber volume fraction. 3) The flexural strength of CFARC was showed increasing trend up to 17% cowpared to ARC at 5% carbon fiber volume fraction.
Rho, Seong-hwan,Lee, Han Mi,Lee, Kyunglim,Park, Chul-Seung 梨花女子大學校 藥學硏究所 2000 藥學硏究論文集 Vol.- No.9
Bovine retinal cyclic nucleotide-gated (CNG) ion channel contains an evolutionary conserved N-glycosylation site in the external loop between the fifth transmembrane segment and the pore-forming region. The effect of tunicamycin treatment and the site-specific mutation suggested that the channel is glycosylated when expressed in Xenopus oocytes. To test the role of glycosylation in this channel, N-glycosylation was abolished by mutation, and the detailed permeation and the gating characteristics of the mutant channel were investigated. The charge contribution turned out to be detectable, although the mutation of the N-glycosylation site did not affect expression and functionality of the CNG channel in oocytes.
노양래,이혁수,황창모,최성욱,이정찬,최혁,이환성,오혜정,안상수,손호성,백광제,원용순,선경,최민주,민병구 제주대학교 인공심장이식연구소 2001 인공심장 연구 Vol.2 No.2
심혈관 질환 특히 협심증과 급성 심근 경색증 등 관상동맥 질환이 급증함에 따라 병원 밖이나 응급실 중환자실 심도자 검사실등에서 급성 심장 쇼크에 빠지거나 심장마비가 발생하는 경우가 많이 발생하고 있다. 이러한 심혈관 질환에는 정류성 체외 생명보조장치가 널리 사용되고 있으나 이러한 장치는 그 무게와 크기로 인해 응급상황에 대처할 수 있는 능력이 작고, 막형 산화기의 전단에 인가되는 압력이 크며, 시스템 구성상 혈액이 공기에 노출된다. 그리하여 박동성 혈류를 공급할 수 있는 공기에 노출되지 않는 시스템(Close System)이 필요하다. 박동성 혈류를 공급하기 위하여 단일 구동펌프를 이용한 시도가 있었으나 회로내의 순간 압력 상승등으로 인한 단점이 도출되었다. 이러한 기존의 체외생명보조장치의 단점을 극복하고자, 한국형 인공심장의 원리를 이용한 박동식 이중 구동형 혈액펌프를 개발하였고, T-Pls(Twin-Pls)라 명칭하였다. 이 시스템의 구동원리는 막형산화기를 중심으로 전 ㆍ 후에 혈액펌프를 위치하여 혈액펌프를 Actuator가 한번씩 짜주는 것이다. 이런 방법으로 구동할 경우 막형산화기 후단에 있는 펌프가 음압을 동시에 일으킴으로, 막형산화기에 인가되는 큰 양압을 줄인다는 가정하에 이 시스템을 개발하였고, in vitro 실험을 통하여 각 부분의 압력을 측정하고, 총 12건의 동물실험(대형동물 : 6건, 소형동물 : 6건)을 통하여 그 장점을 검증하였다. Many cases of Acute cardiac shock and Cardiac arrest in Emergency room and ICU have been increasing. In this case, ECMO with Centrifugal pump has been used generally. However, due to the heavy weight and big size, the system is not adequate for Emergency cases. And other defects of this system are that Membrane Oxygeantor's pressure is high and blood are exposed to the air. There was some tries of ECMO using pulsatile pump, but it was found that the weak point of these system is high peak pressure and hemolysis. To overcome these defects, we have developed Twin Pulsatile Life System and we named 'T-Pls'. The mechanism of 'T-Pls' is that Membrane oxygenator Outlet Pump(MOP) make negative pressure when Membrane oxygenator Inlet Pump(MIP) provides high positive pressure, and the negative pressure will decrease positive pressure of Membrane Oxygeantor. Our group analyzed this advantage through In-vitro and 12 Cases In- Vivo test(Big animal : 6 cases, small animal : 6 cases).
( Seong Hwan Kim ),( Joo Youl Huh ),( Suk Kyu Lee ),( Rho Bum Park ),( Jong Sang Kim ) 한국부식방식학회(구 한국부식학회) 2011 Corrosion Science and Technology Vol.10 No.1
The selective surface oxidation of a transformation-induced-plasticity (TRIP) steel containing 1.6 wt.% Mn and 1.5 wt.% Si during annealing at 800℃ was investigated for its influence on the formation of an inhibition layer during hot-dip galvanizing. The selective oxidation of the alloying elements and the oxide morphology were significantly influenced by the annealing atmosphere. The pure N2 atmosphere with a dew point -40℃ promoted the selective oxidation of Mn as a crystalline Mn2SiO4 phase, whereas the N2+10% H2 atmosphere with the same dew point -40℃ promoted the selective oxidation of Si as an amorphous Si-rich oxide phase. During hot-dip galvanizing, the Mn2SiO4 phase was reduced more readily by Al in the Zn bath than the Si-rich oxide phase. Consequently, the pure N2 atmosphere resulted in a higher formation rate of Fe2Al5 particles at the Zn/steel interface and better galvanizability than the N2+10% H2 atmosphere.