燐酸의 濃度와 부飾時間에 依한 琺瑯質面의 粗度에 關한 實驗的 硏究

潘日煥 朝鮮大學校 口腔生物學硏究所 1984 口腔生物學硏究 Vol.7 No.-

Tescera ATL을 이용한 레진 전장관 수복

반일환 ( Il Hwan Ban ),오행진 ( Haeng Jin Oh ),조공철 ( Kong Cheul Cho ) 조선대학교 구강생물학연구소 2004 口腔生物學硏究 Vol.28 No.1

Tescera ATL을 이용한 레진 전장관 수복

반일환 ( Il Hwan Ban ) , 오행진 ( Haeng Jin Oh ) , 조공철 ( Kong Cheul Cho ) 조선대학교 구강생물학연구소 2004 Oral Biology Research (Oral Biol Res) Vol.28 No.1

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치질에 흡수된 불소가 미세경도와 불소함량에 미치는 영향

이수종 ( Su Jong Lee ) , 정진호 ( Jin Ho Jeong ) , 반일환 ( Ill Hwan Ban ) 조선대학교 구강생물학연구소 2003 Oral Biology Research (Oral Biol Res) Vol.27 No.1

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상아질 접착 후 저장기간에 따른 접착제의 접착력 변화

조영곤,반일환,유미경 大韓齒科保存學會 2005 Restorative Dentistry & Endodontics Vol.30 No.3

본 연구는 상아질에 2단계와 단일 단계 자가 산부식 접착제를 적용하여 복합레진을 접착한 후 저장기간에 따른 미세 인장 결합강도와 접착계면의 변화를 상호 비교하기 위하여 시행하였다. 발거된 상 ·하악 대구치 48개의 교합면측 상아질을 노출시켜 12개씩 4개의 군으로 분류하였다 사용된 접착제의 종류에 따라 SE Bond 군, AdheSE 군, Adper 군, Xeno III 군으로 분류하여 접착제를 적용한 후, 동일 회사의 복합레진 을 4 mm두께로 접착시켰다. 각 군당 4개의 치아를 선택하여 증류수가 담겨진 용기에 집어넣고 37℃의 항온기에 각각 1일 15일, 30일 동안 저장한 후 시편을 제작하여 각각 미세인장 결합강도의 측정과 주사전자 현미경 관찰 하여 다음과 같은 결과를 나타내었다. 2단계 자가 산부식 접착제는 1일에서 30간의 저장기간 동안 결합강도가 점차적으로 감소하였지만 통계학적으로 유의한 차이를 나타내지 않았고, 상아질과 접착제 간에 긴밀한 접착관계를 보였다. 반면에 단일 단계자가 산부식 접착제는 1일의 저장기간에 비해 30일의 저장기간에서 통계학적인 결합강도의 감소를 나타내었으며, 상아질과 접착제 간에 넓은 간극이 관찰되었다. 따라서 본 연구에서 나타난 두 종류의 30일 동안의 접착내구성은 2단계 자가 산부식 접착제가 단일 단계 자가 산부식 접착제보다 우수한 것으로 나타났다. This study compared the microtensile bond strength (μTBS) and microscopic change of two 2-step and two 1-step self-etching adhesives to dentin according to storage times in distilled water. Occlusal dentin was exposed in 48 human molars. They were divided to four groups by different adhesives: SE Bond group (Clearfil SE Bond), AdheSE group (AdheSE). Adper group (Adper Prompt L-Pop), and Xeno group (Xeno III). Each group was stored in 37℃ distilled water for 1, 15, and 30 days. Resin-bonded specimens were sectioned into beams and subjected to μTBS testing with a crosshead speed of 1 mm/minute. For SEM observation, one specimen was selected and sectioned in each group after each stroage time. Resin-dentin interface was observed under FE-SEM. In all storage times, mean μTBS of SE group was significantly higher than those of other groups (p < 0.05). There was no significant difference between mean μTBS of SE group and AdheSE group among all storage times, but significant difference between 1- and 30-day storage in mean μTBS of Adper group and Xeno group (p > 0.05). For 1-and 15-day storage, all groups showed the close adaptation between resin-dentin interfaces. For 30-day storage, resin-dentin interfaces showed wide gap in Adper group and separate pattern in Xeno III group. Resin-bonded specimens were sectioned into beams and subjected to μTBS testing with a crosshead speed of 1 mm/minute. For SEM observation, one specimen was selected and sectioned in each group after each stroage time. Resin-dentin interface was observed under FE-SEM. In all storage times, mean μTBS of SE group was significantly higher than those of other groups (p < 0.05). There was no significant difference between mean μTBS of SE group and AdheSE group among all storage times, but significant difference between 1- and 30-day storage in mean μTBS of Adper group and Xeno group (p > 0.05). For 1-and 15-day storage, all groups showed the close adaptation between resin-dentin interfaces. For 30-day storage, resin-dentin interfaces showed wide gap in Adper group and separate pattern in Xeno III group.

치질에 흡수된 불소가 미세경도와 불소함량에 미치는 영향

이수종,정진호,반일환 조선대학교 구강생물학연구소 2003 Oral Biology Research (Oral Biol Res) Vol.27 No.1

The Purpose of this study was to evaluate the influence of fluoride uptake on microhardness and fluoride contents of tooth structure, Forty extracted human teeth were used, which were prepared proximal cavities. Experimental teeth were divided into five groups. Group 1: Prime & Bond NT and 2100 : Group 2 : Prime & Bond NT and F2000 : Group 3 : Scotchbond Multi-Purpose and 2100 : Group 4 : Scothcbond Multi-purpose and F2000 : Group 5 : Fuji Ⅱ LC. The cavities were filled with dentin adhesives and restorative materials. Teeth were coated 2 times with nail varnish. and immersed in a polypropylene tube. Tubes were stored in water bath at 37±0.5℃. After four weeks, the tooth was bisected longitudinally and the microhardness of the dentin and enamel were determined by indentation (at 30.100㎛ depth). The other halves were analyzed for fluoride by an EPMA-WDX device (at30, 100, 200㎛ depth). The results were as follows : 1. There was no correlation between the microhardness and amount of uptaken fluoride in the all groups. 2. There was no significant statistical difference in the amount of uptaken fluoride of the all groups in enamel without regard for groups and depth(p>0.05). 3. In the Group 2 and 5, EPMA-WDX result showed higher fluoride uptake of the. each depths in dentin(p<0.05). 4. At 30㎛ depth in dentin, EPMA-WDX result showed that group 2 had higher fluoride uptake than group 1 and 3 and group 5 had than the other groups. In conclusion, fluoride uptake increased by fluoride releasing materials. But, it was influenced by dentin bonding agents and surface conditions. Therefore, further study about relation between dentin bonding agent, surface coating, and fluoride uptake is necessary.

멤브레인형 LNG 화물창의 강도 평가를 위한 분사 모델 적용

황세윤,이장현,김성찬,반일환 대한조선학회 2012 대한조선학회 학술대회자료집 Vol.2012 No.5

Sloshing pressure has been identified as a significant factor in the safety of LNG (liquefied natural gas) cargo transportation. In terms of practical design procedures for LNG cargo containment, it is difficult to evaluate sloshing impact and structural response in realistic way because of the complexity of sloshing phenomena, which is a type of fluid-structure interaction. A simplified numerical model is conducted to create an assessment procedure for sloshing impact in partially-filled LNG cargo tanks. A computational procedure based on an impinging jet of LNG acting on an insulation panel is employed in order to evaluate the sloshing impact on a real cargo tank. The velocity of the impinging jet is determined by a similarity rule that scales up the impact velocity from a small scale to that of actual scale. Several procedural components are introduced for a structural response calculation based on transient pressure. The transient pressure is associated with the model test, computational model of sloshing motion and the impact velocity of both model and real scale. The results of proposed procedure are evaluated by comparison with ship yard practice for membrane containment that.

멤브레인형 LNG 화물창의 강도 평가를 위한 분사 모델 적용

황세윤,이장현,김성찬,반일환 한국해양환경·에너지학회 2012 한국해양환경공학회 학술대회논문집 Vol.2012 No.5

Sloshing pressure has been identified as a significant factor in the safety of LNG (liquefied natural gas) cargo transportation. In terms of practical design procedures for LNG cargo containment, it is difficult to evaluate sloshing impact and structural response in realistic way because of the complexity of sloshing phenomena, which is a type of fluidㅡstructure interaction. A simplified numerical model is conducted to create an assessment procedure for sloshing impact in partially-filled LNG cargo tanks. A computational procedure based on an impinging jet of LNG acting on an insulation panel is employed in order to evaluate the sloshing impact on a real cargo tank. The velocity of the impinging jet is determined by a similarity rule that scales up the impact velocity from a small scale to that of actual scale. Several procedural components are introduced for a structural response calculation based on transient pressure. The transient pressure is associated with the model test, computational model of sloshing motion and the impact velocity of both model and real scale. The results of proposed procedure are evaluated by comparison with ship yard practice for membrane containment that.

『선박 해양 구조물 정보 교환을 위한 기술 문서 표준 방안에 관한 연구』

손금준(Gum Jun Son),이장현,반일환 (사)한국CDE학회 2013 한국 CAD/CAM 학회 학술발표회 논문집 Vol.2013 No.1

확률밀도함수(PDF)를 이용한 함정 피격성 분석 기법 연구

김광식(KwangSik Kim),이장현(JangHyun Lee),황세윤(SeYun Hwang),반일환(IlHwan Ban) (사)한국CDE학회 2014 한국 CAD/CAM 학회 학술발표회 논문집 Vol.2014 No.2

The survivability of the warship is defined as the capability of a warship to avoid or withstand a man-made hostile environment. The survivability of the warship consists of three categories (Susceptibility, Vulnerability and Recoverability). A warship performance in susceptibility terms is measured by the probability of detection, and probability of hit. So, the level of susceptibility of a warship in encounter with threat is dependent upon attributes for detection equipment and weapon system. This paper has described the theoretical procedure for the susceptibility assessment. And, the theoretical background which is suggested to assess the susceptibility of a warship is based on the simplified probabilistic theory. The main emphasis of this paper would be on simplified calculation model based on the probability density function for probability of hit. It implements assessment of the probability of hit given a both singlehit and multiple-hit. The susceptibility is accessed for a RCS (Radar Cross Section) and the hit probability for a rectangular target is applied for a given threat.