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Calcium sulfate-Hydroxyapatite 혼합재의 물성 및 치근천공 치유효과에 관한 연구
이승종,김경남,Lee, Seung-Jong,Kim, Kyoung-Nam 대한치과보존학회 1997 Restorative Dentistry & Endodontics Vol.22 No.2
Treatment of root perforation elicits special considerations due to its blood-contaminated circumstances. It is known that conventional dental restorative materials are all leaking. Calcium sulfate is the material which react with water to become chemically set. This study, therefore, was performed to develop a new compound containing calcium sulfate and to evaluate its physical and biological characteristics. Three materials were used, IRM, calcium sulfate, calcium sulfate-hydroxyapatite compound. The composition of the calcium sulfate-hydroxyapatite compound was basically 50 % of calcium sulfate and 50 % of hydroxyapatite mixed with guajacol. The materials were mixed in conventional way and underwent four physical test procedures, setting time, solubility test, compressive strength, and marginal leakage test. All materials were evaluated under the scanning electron microscope to examine the marginal sealing ability. Animal experiment was also performed to test the materials' tissue response. Twenty-four dog's premolars were tested with either furcation perforations or apical retro-fillings. From the results, we found that calcium sulfate possess the good marginal sealing ability. However, calcium sulfate creates many voids which is caused by crystal thrusting action when it reacts with water. It seemed that the voids caused disintegration of the material which eventually lead to tissue reaction. By compounding calcium sulfate and hydroxyapatite, we were able to obtain the better physical properties but it showed larger marginal gap between the material and the root surface. Within the six weeks observation period, both IRM and calcium sulfate-hydroxyapatite compound showed good tissue responses in animal experiment. It is concluded that calcium sulfate would be the material of choice in root perforation repair, but the physical property needs to be further improved.
제주 연안 독가시치 Siganus fuscescens의 연령과 성장
이승종 ( Seung Jong Lee ),김종빈 ( Jong Bin Kim ),김맹진 ( Maeng Jin Kim ),정석근 ( Suk Geun Jung ) 한국어업기술학회 2014 수산해양기술연구 Vol.50 No.2
The age and growth of rabbit fish, Siganus fuscescens were investigated from samples monthly collected in the coast of Jeju island, Korea from February to December 2012. Ages were determined from annuli in otoliths, and annuli were formed in one or two months immediately after spawning once a year. Also, main spawning period was estimated between July and August, thus rings were considered as annual marks. The von Bertalanffy growth equations estimated from a non-linear regression method were Lt=37.24 (1-e-0.33(t+1.24)) (R2=0.92) for female and Lt=31.44(1-e-0.45(t+1.23)) (R2=0.90) for male, and the growth between female and male was different.
이승종(Seung Jong Lee),류상오(Sang Oh Ryu),이재용(JaeYong Lee),윤덕규(Deok-Kyu Youn),김일호(Il-Ho Kim),김혜수(Hye Soo Kim) 한국환경에너지공학회 2022 한국열환경공학회 학술대회지 Vol.2022 No.2
미세먼지의 경우 발전소나 산업체 연소시설에서 화석연료를 연소시키거나 자동차 배기가스 둥에서 주로 배출되고 있다. 미세먼지의 직접적인 배출뿐만 아니라 발전소에서 다량 배출되고 있는 SOX나 NOx의 경우 대기 중에서 화학반용에 의해 미세먼지로 전환된다 따라서 현재 이러한 원인 물질의 배출을 저감하기 위해 배출허용 기준이 점차 강화되고 추세이며, 배출허용 기준 이하로 원인 물질을 배출하기 위한 기술개발들이 추진되고 있다. 본 연구에서는 2015년 이후에 설치된 석탄화력 발전소의 배출허용 기준인 25 ppm 이하로 배출되는 SO₂를 추가적으로 제거하기 위해, KOH롤 첨착한 복합 활성탄올 이용하여 10 ppm 정도로 유입되는 SO₂를 80% 이상 제거하는 이동총 홉착탑을 개발하였다. SO₂를 제거하기 위한 홉착제로는 KOH가 첨착된 복합 활성탄올 개발하였으며, 6 CMH급 및 100 CMH급의 이동총 홈착탑을 순차적으로 개발하여 운전실험을 진행하였다. 현재 이들 설비둘의 운전결과를 바랑으로 2,000 CMH급의 흡착탑에 대한 설계/구축을 완료하고, 석탄 연소설비와 연계하여 SO₂ 제거실험을 준비하고 있으며, 200,000 CMH급 흡착탑에 대한 설계를 진행하고 있다.