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류상,노경환,최광현,김원국,이원경,김도희,양국현,Ryu, Sang,Roh, Kyung Hwan,Choi, Kwang Hyeon,Kim, Won Guk,Lee, Won Kyung,Kim, Do Hee,Yang, Kuk Hyeon 한국세라믹학회 2018 세라미스트 Vol.21 No.3
In this study, the aspherical lens for optical communications produced not with an one-step pneumatic type of external pressurization system (existed GMP process) but a constant weight of self-loaded mold put up to upper core. So the lens is molding with self-loaded weight molding and it calls Weight Molding process. In self-loaded molding process, we measured changes of center thickness molding lenses with each variable molding temperatures and time to find the effect of center of lens thickness to search key factors. As experimental results, the center thickness reach to targeted lenses step time value was changed drastically and it depends by molding temperature. If the molding temperature gets higher, the targeted lens that is reaching to the center thickness step time value was decreased. To find the effect of life improvement on mold core by imposing the self-loaded molding process we molded with GMP(Glass molding press) method and self-loaded molding method for 9,000 times and measured the lenses shape accuracy and surface roughness to evaluate the core life. As a result the self-loaded molding method core has 2,000 times longer that GMP (Glass molding press) method. If we adopt self-loaded molding method of the optical aspherical lens molding in the future, we expect that it would reduce the expense of changing the molds by molding core life improvements.
류상(Sang Ryu),노경환(Kyung Hwan Roh),최광현(Kwang Hyeon Choi),김원국(Won Guk Kim),이원경(Won Kyung Lee),김도희(Do Hee Kim),양국현(Kuk Hyeon Yang) 한국세라믹학회 2018 세라미스트 Vol.21 No.4
In this study, the aspherical lens for optical communications produced not with an one-step pneumatic type of external pressurization system (existed GMP process) but a constant weight of self-loaded mold put up to upper core. So the lens is molding with self-loaded weight molding and it calls Weight Molding process. In self-loaded molding process, we measured changes of center thickness molding lenses with each variable molding temperatures and time to find the effect of center of lens thickness to search key factors. As experimental results, the center thickness reach to targeted lenses step time value was changed drastically and it depends by molding temperature. If the molding temperature gets higher, the targeted lens that is reaching to the center thickness step time value was decreased. To find the effect of life improvement on mold core by imposing the self-loaded molding process we molded with GMP(Glass molding press) method and self-loaded molding method for 9,000 times and measured the lenses shape accuracy and surface roughness to evaluate the core life. As a result the self-loaded molding method core has 2,000 times longer that GMP (Glass molding press) method. If we adopt self-loaded molding method of the optical aspherical lens molding in the future, we expect that it would reduce the expense of changing the molds by molding core life improvements.
오방일,노경환,조기철,정영헌,오광중 부산대학교 환경문제연구소 2004 環境硏究報 Vol.22 No.-
A Study on the Solidification of Soi1 Contaminated by Arsenite
부신기능 부전증과 동반된 혼합 유기용제에 의한 말초신경병증 : 증례보고 A Case Report
김기찬,정호중,노경환,김진하,안재두 고신대학교 의학부 2002 高神大學校 醫學部 論文集 Vol.17 No.1
N-Hexane which is contained within organic solvents is produced by cracking of crude oil and subsequent fractional distillation, but also from natural gas and coal. Its main use was for oil seed extraction, producing in the rubber industry, in glues (e.g, in the shoe industry), and as solvent in paints, lacquers, and printing ink. Most often n-hexane is mixed with other solvents. We experienced a patient with peripheral polyneuropathy due to chronic exposure of mixed solvents combined with mental deterioration owing to adrenal insufficiency. He had occupational history of dealing with adhesives containing n-hexane over 30 years and suffered from muscle wasting and weakness of all extremities and difficulty of independent ambulation for 2 years. He also had taken herb medications for 3 years intermittently. He had mental deterioration. hyponatremia and low cortisol level in plasma. After rehabilitation program, motor weakness of his lower limbs improved to good degree and mental deterioration was recovered according to coorection of hyponatremia following steroid therapy.