Collagenase와 esterase가 상아질 접착강도와 nanoleakage에 미치는 영향

정영정,한세현,김종철,이상훈,김정욱,김영재,장기택 大韓小兒齒科學會 2008 大韓小兒齒科學會誌 Vol.35 No.3

본 연구는 상아질 접착계면에서 collagenase와 esterase가 접착강도와 극미세누출에 미치는 영향을 살펴보기 위해 시행하였다. 발치된 치아의 교합면 상아질에 Single Bond 2(SB)와 Clearfil SE bond(SE)를 사용하여 상아질-레진 접착시편을 제작하고,시편을 인산완충용액(PBS)에 24시간(I),또는 PBS(II),collagenase 용액(III),esterase 용액(IV)에 4주간 보관 한 후 질산은 용액으로 염색하였다. 시편의 미세인장접착강도(μTBS)와 질산은 침투 면적을 측정하여 다음과 같은 결과를 얻었다. 1. SB군의 접착강도가 II∼IV군에서 SE군에 비해 낮은 값을 나타내었다(p<O.05). SB군은 II∼IV군의 접착강도가 I군에 비해 낮은 값을 보였으나(p<O.05),SE군의 접착강도는 I∼IV군간에 차이를 보이지 않았다(p>O.05). 2. SB군의 질산은 침투 면적이 SE군에 비해 높았으며(p<O.05),SB군과 SE군에서 질산은 침투 면적은 I ∼ IV군간에 차이를 보이지 않았다(p>O.05). 3. 접착강도와 질산은 침투 면적은 SE군의 I, II,III군에서 음의 상관관계를 보였다(p<O.05). The purpose of this study was to evaluate the effects of collagenase and esterase on dentin bond strength and nanoleakage. Resin composites were bonded to occlusal dentin of premolars with Single Bond 2(SB) and Clearfil SE Bond(SE). After the microtensile specimens were prepared and stored in PBS for 24 hours(I) or, PBS(II), collagenase(III), esterase(IV) solution for 4 weeks, the specimens were stained with silver nitrate solution. Microtensile bond strength(μTBS) and silver penetration area were measured and, the results were as follows: 1. For group II, III, and IV, the bond strengths of SB were lower than those of SB(p<0.05). The bond strengths of SB II, III, and IV were lower than that of SB I(p<0.05). There was no difference among the bond strengths of SE I ∼ IV groups(p>0.05). 2. Silver penetration areas of SB were higher than those of SE for all storage groups(p<0.05). In SB and SE groups, there was no significant difference of silver penetration area among I ∼ IV groups(p>0.05). 3. SE I, II, and III showed inverse relationship between the bond strengths and the silver penetration areas(p<0.05).

Chalcogenization-Derived Band Gap Grading in Solution-Processed CuIn_<i>x</i>Ga_1–<i>x</i>(Se,S)₂ Thin-Film Solar Cells

Park, Se Jin,Jeon, Hyo Sang,Cho, Jin Woo,Hwang, Yun Jeong,Park, Kyung Su,Shim, Hyeong Seop,Song, Jae Kyu,Cho, Yunae,Kim, Dong-Wook,Kim, Jihyun,Min, Byoung Koun American Chemical Society 2015 ACS APPLIED MATERIALS & INTERFACES Vol.7 No.49

<P>Significant enhancement of solution-processed CuInxGa1-x(Se,S)(2) (CIGSSe) thin-film solar cell performance was achieved by inducing a band gap gradient in the film thickness, which was triggered by the chalcogenization process. Specifically, after the preparation of an amorphous mixed oxide film of Cu, In, and Ga by a simple paste coating method chalcogenization under Se vapor, along with the flow of dilute H2S gas, resulted in the formation of CIGSSe films with graded composition distribution: S-rich top, In- and Se-rich middle, and Ga- and S-rich bottom. This uneven compositional distribution was confirmed to lead to a band gap gradient in the film, which may also be responsible for enhancement in the open circuit voltage and reduction in photocurrent loss, thus increasing the overall efficiency. The highest power conversion efficiency of 11.7% was achieved with J(sc) of 28.3 mA/cm(2), V-oc of 601 mV, and FF of 68.6%.</P>

상아질 접착에서 collagenase와 esterase가 미세인장결합강도에 미치는 영향

정영정,현홍근,김영재,김정욱,이상훈,김종철,한세현,장기택 대한소아치과학회 2007 大韓小兒齒科學會誌 Vol.34 No.2

상아질-레진 접착강도에 대한 collagenase와 esterase의 영향을 살펴보기 위해, 소구치의 교합면 상아질에 Single Bond 2와 Clearfil SE Bond로 접착을 시행하고 미세 시편을 제작하여 PBS, collagenase 용액, esterase 용액에 4주간 보관한 후 미세인장결합강도를 측정, 비교하여 다음과 같은 결론을 얻었다. 1. 모든 보관 용액에서 Single Bond 2의 미세인장결합강도는 Clearfil SE Bond보다 유의하게 낮았다(p<0.05). 2. Single Bond 2의 미세인장결합강도는 collagenase군이 PBS군, esterase군보다 낮았다(p>0.05). 3. Clearfil SE Bond의 미세인장결합강도는 esterase군이 PBS군에 비해 낮았으나(p>0.05), collagenase군보다는 높았다(p>0.05). Collagenase군은 PBS군에 비해 유의하게 낮은 미세인장결합강도를 보였다(p<0.05). The purpose of this study was to evaluate the effect of collagenase and esterase on the microtensile bond strength (μTBS) in dentin bonding. After resin composites were bonded to occlusal dentin, μTBS specimens were formed and stored in PBS, collagenase, or esterase solution. After 4-week storage, μTBS was determined and, the results were as follows: 1. μTBS values of Single Bond 2 were lower than those of Clearfil SE Bond for all storage medium (p<0.05). 2. In single Bond 2 group, collagenase solution lowered bond strength more than PBS and esterase solution (p>0.05). 3. In Clearfil SE Bond group, esterase solution lowered bond strength more than PBS(p>0.05). Collagenase solution lowered bond strength more than esterase solution(p>0.05) and PBS(p<0.05).

韓中新文學史之分期比較

許世旭 韓國外國語大學校 外國學綜合硏究센터 中國硏究所 1984 中國硏究 Vol.8 No.-

순간충격시험에 의한 금정산지역 화강암의 수리적 매개변수 산출

함세영,김문수,성익환,이병대,조병욱,김광성,김성이 부산대학교 환경문제연구소 2000 環境硏究報 Vol.18 No.-

This study is aimed for estimating hydraulic parameters using the Cooper-Bredhoeft-Papadopulos, the Hvorslev, the Bouwer & Rice analyses of data obtained by the slug test, and for characterizing hydraulic properties at the test holes in relation to drill core data. The study area was divided into four subareas far which the hydraulic characteristics was considered. The relationship among hydraulic parameters obtained by the three slug test analyses was also considered. The difference of hydraulic conductivity estimates between the injection slug test and the withdrawal slug test seems to be caused by the permeable fracture distribution around the test hole and the disturbance of fine materials in the fractures induced by the pressure variation due to slug injection and withdrawal. The hydraulic conductivity estimates calculated by the Cooper-Bredhoeft-Papadopulos, the Hvorslev and the Bouwer & Rice analyses range from 10-8 to 10-5m/sec, and the average ranges from 10-7 to 10-6m/sec.

「中國文學史」裡頻見的規律問題

許世旭 中國語文硏究會 1989 中國語文論叢 Vol.2 No.-

T1 전송로의 고장 상태 감시를 위한 연구

김세영,이채욱 大邱大學校 科學技術硏究所 1995 科學技術硏究 Vol.2 No.2

Although the number of subscribers for mobile communication is geometrically increasing, T1 transmission line is not able to be sensed because it does not have a visible and audible function when it is down. For this reason, it has caused serious problems in the development of mobile communication. While finding out the cause for trouble, moreover, the technician dispatch is causing various problems such as the waste of expenses and labor and noncontrol of troubles. To solve these problems, this study was conducted by suggesting and devising the monitoring unit using the multi T1 monitor. As the result of this study, it was possible to early find out not only trouble of the T1 transmission line but also its down and recovery times, and to easily control its trouble time.

외상으로 완전 함입된 영구전치의 치험례

김정욱,한세현,현홍근,이상훈 대한소아치과학회 2000 大韓小兒齒科學會誌 Vol.27 No.3

외상성 함입탈구는 유치열에서는 흔하지만 영구치열에서는 매우 드문 질환으로 그 예후가 좋지 않은 것으로 널리 알려져 있다. 치료법으로는, 치아의 자발적 맹출을 허용하거나, 외과적으로 재위치시킨 후 고정시키는 방법, 외과적인 탈구술 및 교정력을 이용한 재위치술 등이 있었으나, 각각의 단점들이 보고되어 왔다. 한편 치아를 외과적으로 아탈구시킨 후 바로 교정력을 적용시켜, 좋은 성과가 보고된 바 있었는데 완전 함입례에서는 교정용 button 이나 bracket을 bonding하기가 적절치 않다. 본 증례는 비강내로까지의 심한 함입탈구 소견을 보이는 환아의 치료에 관한 것이다. 우선 full mucogingival flap을 행하고, 치조와 내로 외과적 재위치 시킨 후 교정적 견인력을 적용시키는 방법을 통해 비교적 양호한 결과를 얻게 되었다. 주요어 : 교정적 견인, 외과적 재위치, 외과적 탈구, 외상, 탈구, 함입 Traumatic intrusive luxation, an occurrence common in the primary dentition but one that occurs rarely in the permanent dentition, has a poor prognosis. There have been many treatment approaches such as allowing the tooth to reerupt spontaneously, surgical repositioning and immediate fixation, surgical luxation. and orthodontic repositioning; but all have their own drawbacks. Meanwhile. Tul·ley et at (1987) have propsed surgical and orthodontic combination therapy to treat intrusion. Surgical and orthodontic combination therany means to apply the orthodontic traction force immediately after surf·gical luxation. If ankylosis occurs, orthodontic force may be applied after re-luxation repeatedly But in cases of complete intrusive luxation, it would be not feasible to bond an orthodontic button or bracket on the tooth directly. Thus, in this case, traction of the tooth was attempted after surgically repositioning it close to the probable original socket site to promote better healing.

中國文學在韓國譯介之歷代特色

許世旭 中國語文硏究會 1990 中國語文論叢 Vol.3 No.-

從兩岸當代詩, 比較中國傳統文化

許世旭 中國語文硏究會 1996 中國語文論叢 Vol.11 No.-