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Ti-15-3합금의 결정립 미세화가 인장 특성에 미치는 영향
이찬영,박용민,이영국,Lee, Chan-Young,Park, Young-Min,Lee, Young-Kook 한국재료학회 2009 한국재료학회지 Vol.19 No.11
Titanium alloys have been attractive due to a high ratio of strength to weight as well as good corrosion resistance. However, strengthening causes a decrease in ductility in Ti alloys, as is usual in other alloys. For enhanced strength without ductility reduction, grain refinement and tensile properties were investigated as functions of thickness reduction of cold rolling and annealing condition in Ti-15V-3Cr-3Sn-3Al alloy with a ${\beta}$ single phase. The average grain size of the specimen, which was cold-rolled by 90% and annealed at 700$^{\circ}C$ for 5 min, was decreased to approximately 19 ${\mu}m$. The grain refinement of 63 μm to 19 ${\mu}m$ increased yield stress by 90 MPa without a significant decrease in total elongation. The Ti-15-3 alloy exhibited very low work hardening during tensile test at a crosshead speed of 2 mm/min. This result was discussed based on dynamic recovery associated with dislocation annihilation in grain boundaries.
이찬영,Lee, Chan-Young,Aoba, Takaaki The Korean Academy of Conservative Dentistry 1995 Restorative Dentistry & Endodontics Vol.20 No.2
The present study was undertaken to investigate the crystal growth onto enamel mineral and synthetic hydroxyapatite seeds in media resembling the enamel fluid composition. Effects of fluoride at low concentrations on the precipitation were also examined in a benchtop crystal growth model adopting a miniaturized reaction column. X-ray diffraction and Fourier transform infrared spectroscopy(FTIR), as well as chemical analyses, were employed for characterization of both seed materials before and after experimentation. Remarkable findings were that (1) both biological and synthetic seeds at the same total surface areas yielded rather similar precipitation rates at all levels of fluoride concentration in solution and (2) the precipitation rate was accelerated in a manner depending on fluoride concentrations in media. FTIR differential analysis disclosed that the precipitating phase was characterized as poorly crystallized apatite, which incorporated subtle carbonate. Most of the fluoride ions in soution were readily incorporated into crystals. The overall results support the view that the seeded crystal growth model is of value to gain insight into the mechanism of enamel crystal growth under fluoride regimens.
이찬영,장태순,Lee, Chan Young,Chang, Taesun 한국강구조학회 2016 韓國鋼構造學會 論文集 Vol.28 No.5
To predict service life of coating systems registered in Korean specifications for steel bridge coatings, field deterioration evaluation and accelerated weatherproof test were carried out, and deterioration models were drawn through regression analysis for evaluation results. For the coating systems that have not been used in field, regression analyses were carried out for the virtual evaluation results drawn by applying coordination factor to the field evaluation results for chlorinated rubber and urethane topcoat system. Service life prediction results showed that application of thermal sprayed coating (TSC) could extend service life of coatings to more than twice of general coatings. 국내의 강교 도장 시방에 등재되어 있는 도장계에 대한 공용수명 예측을 위하여 현장 열화도 평가 및 촉진 내후성 시험을 수행하였고, 평가 결과에 대한 회귀분석을 통하여 열화모델을 도출하였다. 현장 적용 실적이 없는 도장계에 대해서는 국외 연구 결과 및 본 연구에서 수행한 촉진 내후성 시험 결과를 참고하여 염화고무계 및 우레탄 마감 도장계의 현장 열화도 평가 결과에 열화도 항목별 조정계수를 적용하여 가상의 평가 결과를 도출한 후에 회귀분석을 실시하였다. 공용수명 예측 결과는 금속용사를 적용하면 도장계의 수명을 일반 도장계 대비 2배 이상 연장시킬 수 있다는 것을 보여주었다.
Co-60 방사선 조사가 백서 치아에 미치는 영향에 관한 실험적 연구
이찬영,Lee, Chan-Young 대한치과보존학회 1982 Restorative Dentistry & Endodontics Vol.8 No.1
This study was undertaken to compare the histopathological effects of the fractionated doses of 2,400, 4,800 and 7,200 rads of Cobalt-60 irradiation on the teeth of the sixty eight rats (Wester strain), weighing approximately 130gm. They were devided into four groups; no irradiation as a control (Group I) and others (Group II, III, and IV) which received different doses of radiation using 1.25 Mev RAC-120 Cobalt-60 Teletherapy Unit with exposure dose rate 69 rads/min, TSD 80cm. Experimental animals received 600 rads every three days until the total dosage of their groups were reached. Experimental animals were sacrified at the 1st day, 1st, 2nd, 3rd, 4th, 5th and 6th week irradiation. The following histopathologic findings were obtained: 1. The Group II, received 2,400 rads, showed no histopamologic changes essentially same as those of the control Group. 2. In the Groups III and IV, received 4,800 rads and 7,200 rads, disarray of the normal palasading arrangement of the odontoblastic cells, vacuolar degeneration in the odontoblastic layer, osteodentin and dentinal niches in the anterior teeth were observed. 3. There were no distinct changes in the posterior teeth in the Groups III and IV. 4. The ameloblast cells seemed to be less sensitive to radiation damage than the odontoblast cells.
전기방사를 활용한 나노섬유 증착 미세먼지 방진망에 관한 연구
이찬영 ( Chan Young Lee ),이상민 ( Sang Min Lee ),송현진 ( Hyeon Jin Song ),이재준 ( Jae Jun Lee ),김영순 ( Young Soon Kim ),김홍건 ( Hong Gun Kim ) 한국국방기술학회 2024 한국국방기술학회 논문지 Vol.6 No.1
현재 전 세계적으로 미세먼지가 확산되고 있는 가운데 미세먼지는 그 크기가 매우 작아 실내로 손쉽게 유입되어 실내 공기질을 저하시키기 때문에 가구 내 청정 유지 및 공기질 향상을 위해 반드시 해결해야 할 필수 과제이다. 미세먼지의 효과적인 차단 및 공기투과도와 분진포집율 확보를 위한 전기방사(Electrospinning) 기술에 대한 연구가 지속적으로 진행되고 있다. 본 연구에서는 방진망에 전기방사를 통해 PVDF 미세먼지 방진망을 제조하였으며, 제조된 방진망의 외부 환경 저항성 및 실내 공기질 개선 효율을 확인하기 위한 실험을 수행하였다. 이 방진망이 미세먼지를 효과적으로 차단하고, 미세먼지로 인해 발생하는 질병을 예방할 수 있는 실용적인 대안이 될 수 있음을 검증하였다. While fine dust is currently spreading around the world, fine dust is so small that it easily enters indoors and deteriorates indoor air quality, so it is an essential issue that must be solved to maintain cleanliness and improve air quality in households. Research on nanoradiation technology is continuously being conducted to effectively block fine dust and secure air permeability and dust collection rate. In this study, a PVDF fine dust dust-proof net was manufactured through electrospinning, and an experiment was conducted to confirm the external environmental resistance and indoor air quality improvement efficiency of the manufactured dust-proof net. It was verified that this dustproof net can be a practical alternative to effectively block fine dust and prevent diseases caused by fine dust.
로라 네트워크를 활용한 실시간 대기환경 모니터링 시스템 구축
이수현(Lee Soohyun),유현도(Yu Hyundo),이찬영(Lee Chanyoung),이찬휘(Lee Chanhwi),최은총(Choi Eunchong),한상화(Han Sanghwa),김예인(Kim Yein),이신원(Lee Shinwon),김신웅(Kim Shinwoong) 한국정보기술학회 2024 Proceedings of KIIT Conference Vol.2024 No.5
기술의 발전과 에너지 사용의 증가로 인한 대기 오염 물질 배출이 기후 환경에 심각한 문제가 되고 있으며, 대기질 측정을 위한 고정 측정소는 여전히 비용 및 효율성 측면에서 한계가 있다. 본 논문에서는 IoT를 기반으로 한 저비용 및 저전력 대기 측정 시스템을 개발하고, 실시간으로 대기오염 물질을 측정하는 시스템을 구축한다. 실생활에서 측정소 간의 평균 간격을 축소시킬 수 있도록 밀도 높은 측정 위치를 선정하여 더욱 촘촘한 대기 측정망을 설계한다. 측정된 데이터를 효율적으로 관리하고, 사용자들에게 실시간 모니터링 서비스를 제공한다. The rapid advancement of technology and increasing energy consumption have led to a significant increase in atmospheric pollutant emissions, posing severe challenges to the climate and environment. Traditional fixed monitoring stations for air quality assessment face limitations in terms of cost and efficiency. This paper presents the development of an IoT-based air quality monitoring system designed for low cost and low power consumption. The system is capable of measuring atmospheric pollutants in real-time and is engineered to densify the measurement locations, thus reducing the average distance between stations and creating a more comprehensive monitoring network. The collected data is efficiently managed within a database and is made available to users in real-time through a monitoring service.