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).

유아 언어영재 판별에서 프로젝트 스펙트럼(Project Spectrum)의 활용에 대한 기초연구

장영숙,황윤세 한국영유아보육학회 2003 한국영유아보육학 Vol.0 No.33

The identification of verbally gifted children during early childhood is very important for developing their potential in the society. Nonetheless, most researchers preferred to study the gifted of mathematics and science in the primary and secondary levels where reliable predictions of gifted may be made. Comparatively little work has been done in this area. Verbal Giftedness of young children is still developing and less stable than that of older children, and this prevents us from making firm and accurate identification. Project Spectrum can be used for the alternative assessment for the identification of verbally gifted children. The advantages of the Project Spectrum approach for the identification of verbally gifted children are as follows: First, the Spectrum approach can provide a useful means for assessing young verbally gifted children who have not demonstrated high ability on traditional identification method. Second, the Spectrum approach can blur the line dividing curriculum and assessment and thus can assess the learning process of young children.. Third, the Spectrum approach can embed assessments in meaningful, real-world activities Fourth, the Spectrum approach can be a more accurate predictor of potential by linking diagnosis and instruction. Thus, it can make us provide an educational treatment effectively for young verbally gifted children. Fifth, the Spectrum approach can lead individualized education by the early identification of young verbally gifted children.

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).

통합적 유아 교수·학습방법으로서의 명화 감상활동에 관한 연구

장영숙,황윤세 한국영유아보육학회 2003 한국영유아보육학 Vol.0 No.35

There has been a trend only to stress the expression activities in an early childhood art education. But, recently, there is an increasing emphasis on the appreciation of famous paintings for the early childhood art education. The appreciation of famous paintings can help increase young children's object awareness, value judgment and expressive ability etc. The theoretical basis for the appreciation activities on famous paintings can be derived from DBAE (Discipline-Based Art Education), Project Spectrum, and Vygotsky's theory. DBAE pursues systematic appreciation education by integrative understanding about an art. Project Spectrum based on Gardner's theory also implies the importance of the appreciation activities through artistic observation for the paintings. In addition, Vygotsky's theory also suggests that the artistic experience which teachers offer is very important for enhancing children's appreciation ability In this study, we attempted an integrated approach by using famous paintings in early childhood curriculum. We presented the teaching method for enhancing the appreciation abilities in early childhood arts education by the integrated curriculum. For this, we suggested the six stages: observation, analysis(or interpretation), integrated activity, expressive activity, and evaluation. For the desirable appreciation education, teachers should respect young children's opinion and interact with young children by asking them many questions.

차분 영상의 4대역 분할에 의한 적응 양자화 압축효과

장세봉,김태효,박영석 慶南大學校 附設 工業技術硏究所 1999 硏究論文集 Vol.17 No.-

본 논문에서는 동영상의 차분 프레임을 4개의 부대역으로 분할하고 처리하는 알고리즘을 제안하였다. 본 알고리즘은 동영상 차분 프레임을 구하고 이를 4개의 부대역으로 분할한 후 DCT 처리하게 되는데, 여기서 차분 프레임 사이에 분산 값으로 임계치를 설정하고 움직임 성분을 검출한다. 압축률을 개선하기 위해 SBDCT 및 Huffman 부호화 한다. 모의실험 결과, 0.04bit/pixel의 압축율을 얻을 수 있었다. This paper proposes a moving image compression algorithm using subband coding which divides and processes the difference frame of each moving image into 4 subband region. This method decomposes the original image with each subband and performs DCT. The moving blocks are detected from each of subband using threshold value which is select from the variance of difference between frames, then the data are performed SBDCT and Huffman coding in order to improve the compression ratio. As the result of simulation, we confirmed that this method improved the bit rate of 0.04bit/pixel from reconstructed image.

保存血의 腐敗産物에 依한 에틸알콜 生成濃度에 關한 硏究(Ⅱ)

張成吉,金英雲,柳在薰,權五星,朴世延 內務部 國立科學搜査硏究所 2002 國立 科學 搜査 硏究所 年報 Vol.34 No.-

소형환편기 자동화기술개발에 관한 연구

최세환,장승호,허유,박준희,권영하 경희대학교 산학협력기술연구원 1995 산학협력기술연구논문집 Vol.1 No.-

소형환편기의 자동화기술을 위해 편환을 이동시킬 수 있는 편침과 cam을 편환이송용 장치를 고안하였다. 위편기의 편환이송 mechanism을 해석하고 소형환편기의 물리적 모사를 통해 편침과 cam의 형상을 최적화하였다. 편환이송장치를 사용하여 편물에 다양한 조직을 편성할 수 있는 편기의 개발이 가능하도록 하였다. The latch needle and cam are newly designed and manufactured to transfer the loop for automation of small circular knitting machine. The loop transfer mechanism is analized by the simulation of needle motion on the V-bed flat knitting machine to which optimum designed cam is attached. This loop transfer mechanism can be applied to small circular knitting machine for automation and variable knitted structure.

Vygotsky 이론에 입각한 유아 도덕교육의 방향 탐색

황윤세,장영숙 한국영유아보육학회 2003 한국영유아보육학 Vol.0 No.34

The study for early childhood moral education divides into two streams. One is the social approach(moral socialization) which emphasizes the internalization of morality by socialization. Another is the developmental approach(moral development) which focuses on the development of moral judgment. But the moral education can not be prescribed to be only one side. This study would like to overcome these problems through Vygotsky's theory. The moral development happens between the two levels, which become the boundary of ZPD in the Vygotsky's theory. Vygosky points out the importance of delivering the educational content by teachers(or scaffolders). He argues that teaching leads child's development. In light of Vygotsky's theory, desirable moral education during early childhood can be achieved by the appropriate teaching and learning process through shared activity between a teacher and a child. Both the social approach and the developmental approach for moral education ignored the content or the method of the moral education. These two approaches will overcome the problem by discussing the teaching and learning method which is derived from Vygotsky's theory.

나노 충전제 함량에 따른 복합레진의 표면 미세경도 차이

정영정,김연재,김정욱,이상훈,김종철,한세현,장기택 大韓小兒齒科學會 2005 大韓小兒齒科學會誌 Vol.32 No.1

최근에 개발된 나노 충전제를 microhybrid 복합레진에 첨가할 때, 나노 충전제 함량이 중합에 미치는 영향을 조사하기 위해, 실험적으로 나노 충전제의 함량을 다르게 제작한 복합레진에서 광중합 후 미세경도를 측정, 분석하여 다음과 같은 결론을 얻었다. 1. 나노 충전제의 함량이 2%, 3%인 군은 0%, 1%인 군에 비해 중합된 면의 미세경도가 유의하게 높았으나(p<0.01), 그 차이는 크지 않았다. 2. 나노 충전제의 함량이 높을수록 레진 시편의 하면에서의 미세경도는 증가하였으며, 나노 충전제의 함량이 0%, 1%, 2%간에, 0%, 1%, 3%간에 유의한 차이가 있었고(p<0.01), 2%와 3%간에는 차이가 없었다(p<0.05). 3. 레진 시편의 상면과 하면의 미세 경도 차이는 나노 충전제 함량이 높을수록 감소하였으며, 나노 충전제의 함량이 0%, 1%, 2%간에, 0%, 1%, 3%간에 유의한 차이가 있었고(p<0.01), 2%와 3%간에는 차이가 없었다(p<0.05). The objective of this study was to evaluate the effects of nanofiller content on the microhardness and polymerization of experimental microhybrid composites. The nanofiller contents in the experimental composites were varied (0%, 1%, 2%, 3%), while the total filler content remained constant as 76 %wt. We obtained the following results: 1. The microhardness of the top surface for the 2%, 3% nanofilled microhybrid composites were significantly higher than those for the 0%, 1% nanofilled composites (p<0.05), but the difference was not great. 2. The microhardness of the bottom surfaces significantly increased with an increase in the nanofiller level (p<0.05), except between the 2% and 3% nanofilled groups (p>0.05). 3. As the nanofiller level increased, the difference beween microhardness of top and bottom surfaces significantly decreased (p<0.05), except between 2% and 3% nanofilled groups (p>0.05).

구순열 및 구개열 환자에 대한 Toxoplasma항체의 혈청학적 연구

심영기,이세일,홍인표,정평림,장효죽 大韓成形外科學會 1993 Archives of Plastic Surgery Vol.20 No.1

The etiology of the cleft lip and palate can be explained with a multifarious theory. According to articles, there are some relationships between congenital toxoplasmosis and the cleft lip&palate, but the direct relationships is not obvious. Therefore, this research aims to find the difference of the serum toxoplasma antibody titer between 172 cleft patients who have been treated at National Medical Center and their mother group of 81 cases, healthy control group of 150 cases. The antibody titer was identified by the indirect fluorescent antibody test(>16)and the enzyme-linked immunosorbent assay(>0.3). The results are as follow : 1. By ELISA, the positive rate of the cleft patients(8.1%, 14cases)and that of the mother group(9.9%, 8cases)is higher than the healthy control group(2.7%, 4cases)(p<0.05). 2. By IFAT, the positive rate of the cleft patients(10.5%, 18cases)is higher than the healthy control group(5.3%, 8cases), but the difference is not significant(p>0.05). And the positive rate of the mother group(13.6%, 11cases)is higher than the healthy control group(5.3%, 8cases)(p<0.05). 3. By ELISA and IFAT, the positive rate of the mother group is higher than the cleft patient but the difference is not significant. 4. By ELISA and IFAT, the positive rate of the cleft patients according to the clincal group is not significant. 5. By ELISA and IFAT, the positive rate of the chronic disease group(17.3% & 27.7%)is higher than the healthy control group(2.7% & 5.3%)(p<0.05).