상아질의 봉쇄 시기와 표면처리 방법이 미세인장 결합강도에 미치는 영향

강동호,한종현,박정원,김선재,Kang, Dong-Ho,Han, Chong-Hyun,Park, Jung-Won,Kim, Sun-Jai 대한치과보철학회 2010 대한치과보철학회지 Vol.48 No.1

연구 목적: 본 연구에서는 자가부식 접착제를 이용한 즉시 상아질 봉쇄 (immediate dentin sealing; IDS)와 지연 상아질 봉쇄 (delayed dentin sealing; DDS)에서 상아질 접착제의 결합강도를 비교하고 즉시 상아질 봉쇄에서 접착제 표면의 오염물을 제거하기 위해 사용되는 air abrasion이 상아질에 대한 미세 인장 결합강도에 어떠한 영향을 주는지에 대해 평가하였다. 연구 재료 및 방법: 1개월 이내에 발거된 사람의 건전한 대구치 30개를 6개의 군으로 분리하였고 상아질 접착제로는 자가부식 접착제 Clearfil SE bond (Kuraray, Okayama, Japan)를 사용하였다. 군분류는 치관부를 삭제하여 상아질을 노출시킨 후 즉시 접착제를 도포하고 복합레진 Filtek Z250 (3M ESPE, St Paul, MN, USA)을 충전한 군을 대조군 (Control), 노출된 상아질에 즉시 상아질 접착제를 도포하고 2주 후 재차 접착제를 도포해 복합레진과 같이 광중합하는 즉시 상아질 봉쇄군 (IDS), 상아질 노출 후 상아질 접착을 즉시 시행하지 않고 2주 후 상아질 접착과 복합레진의 충전을 시행하는 지연 상아질 봉쇄군 (DDS)으로 분류하였다. 그후Control군에 air abrasion을 시행한 군을 C-A, IDS군에 air abrasion을 시행한 군을 IDS-A군, DDS군에 air abrasion을 시행한 군을DDS-A군으로 세분화하였다. Control군과 C-A을 제외한 모든 군은 2주간 Fermit을 이용한 임시수복기간을 두었으며 대조군과 실험군 모두 미세인장 결합강도 실험 전 24시간동안 증류수에 보관 후 미세인장 결합강도를 측정하였다. 측정된 미세인장 결합강도는 one-way ANOVA를 이용하여 비교 분석하였으며 유의차가 있는 경우 Scheffe test를 이용한 사후검증을 시행하였다. 결과: 1. 자가부식 상아질 접착제인 Clearfil SE bond를 치아 삭제 직후 상아질 접착을 시행하고 2주간 임시수복 기간을 거친 후 접착제를 재도포하고 복합레진을 수복한 군과 치아삭제 후 2주간의 임시수복기간을 거친 후 상아질 접착을 시행하고 복합레진을 수복한 군 사이에 상아질-레진 간 미세인장 결합강도는 유의한 차이가 없었다 (P>.05). 2. 자가부식 상아질 접착제인 Clearfil SE bond를 상아질 접착 시행 전 $50{\mu}m$ 크기의 aluminum oxide particle로 air abrasion 처리하는 것은 상아질-레진 간 미세인장 결합강도에 유의한 영향을 주지 않았다 (P>.05). Purpose: The purpose of this study was to evaluate the effect of various methods of dentin bonding agent application and air abrasion pretreatment on microtensile bond strength between dentin and resin, using a self-etching adhesive system. Material and methods: Thirty freshly extracted human molars were obtained and divided into 6 groups of 5 teeth. A 2-step self etching adhesive system (Clearfil SE Bond) was used for all groups. The control specimens were prepared using a direct immediate bonding technique. The delayed dentin sealing specimens were prepared using an indirect approach without dentin prebonding. The immediate dentin sealing specimens were prepared using dentin prebonding immediately following preparation. Immediate dentin sealing teeth and delayed dentin sealing teeth had provisional restorations using Fermit for two weeks. Then all specimens of each group were divided into two groups of three, depending on air abrasion pretreatment. Composite "crowns" were incrementally built on and specimens were stored in water for 24 hours. All teeth were prepared for a microtensile bond strength test. Bond strength data were analyzed with a one-way ANOVA test, and post hoc comparison was done using the Scheffe's test. Results: The mean microtensile bond strengths of all groups were not statistically different from each other. Conclusion: When preparing teeth for indirect restorations, IDS and DDS with Clearfil SE bond, have no difference on the microtensile bond strength between dentin and resin. Air abrasion pretreatment did not affect the microtensile bond strength when using IDS and DDS with Clearfil SE bond.

GPS 시스템에 의한 해상측량 및 육상측량기법

강동호,Kang Dong-ho 한국관개배수위원회 1996 한국관개배수논문집 Vol.3 No.2

스마트폰 보안 위협 및 대응 기술

강동호,한진희,이윤경,조영섭,한승완,김정녀,조현숙,Kang, D.H.,Han, J.H.,Lee, Y.K.,Cho, Y.S.,Han, S.W.,Kim, J.N.,Cho, H.S. 한국전자통신연구원 2010 전자통신동향분석 Vol.25 No.3

스마트폰 시장 경쟁 본격화에 따른 개방형 플랫폼 증가와 앱스토어의 등장으로 인하여 범용 OS를 채택하고 있는 모바일 단말은 모바일 악성코드의 제작을 용이하게 만들고 제작된 모바일 악성코드는 범용 OS로 인해 이식성이 높기 때문에 모바일 공격의 및 피해가 증가할 것으로 예상된다. 따라서 향후 더욱 지능화되고 다양한 형태로 변형될 수 있는 악의적 행위에 의한 정보 유출, 불법 과금, 부정 사용 등과 같은 보안 위협 서비스 환경에 안전성, 무결성, 가용성, 신뢰성을 제공하기 위한 스마트폰 보안 기술 개발이 요구된다. 본 고에서는 스마트폰 보안 위협요소와 모바일 악성코드 동향을 살펴보고 이들 위협에 대응하기 위한 단말 및 모바일 보안 인프라 기술들을 소개하고자 한다.

영어수동태학습에서 형태초점과 컴퓨터 매개학습의 장·단기 수준별 효과와 정의적 요인

강동호(Kang Dong-ho) 한국외국어교육학회 2005 Foreign languages education Vol.12 No.3

While the professional literature abounds with the values of focus on form instructions in second language classrooms, few researchers have investigated the differential effects of the off-line focus on form instructions on the different types of target language forms in contexts of on-line computer-mediated communication (CMC). Therefore, the purpose of the study was to examine (1) both short-term and long-term effects of input-centered (input enhancement & processing) and output-centered (dictogloss) instructions on the learning of L2 English passive voice in contexts of CMC (four experimental groups) and (2) Korean secondary school learners' individual differences on the different types of instructions in terms of their intrinsic & extrinsic motivations, motivational behaviors (attention, persistence, & intensity), willingness to communicate {WTC), and attributions of success and failure. The findings showed that the off-line output-centered focus-on-form instruction in context of the online CMC was the most effective in both short-term and long-term periods, in particular for the advanced group, among the four experimental groups. In addition, students' achievment was significantly correlated with intrinsic motivation, motivational behaviors, willingness to communicate, and attributions of success/failure to efforts, in which the patterns of the correlations in turn depended on both students' proficiency levels and the types of focus on form and CMC instructions. The theoretical background and pedagogical implications are discussed.

모바일 보안 위협 및 보안 서비스 기술 동향

강동호(Kang Dong Ho),김정녀(Kim Jeong Nyeo),조현숙(Cho Hyun Sook) 한국정보과학회 2010 정보과학회지 Vol.28 No.6

효율적인 생산공정관리를 위한 공정자료 집중화 시스템

강동호(Dong H. Kang),주진화(Jin H. Ju),이장명(Jang M. Lee) 제어로봇시스템학회 1994 제어로봇시스템학회 국내학술대회 논문집 Vol.1 No.1

시간별 기온을 이용한 예외 기상일의 24시간 평일 전력수요패턴 예측

강동호(Dong-Ho Kang),박정도(Jeong-Do Park),송경빈(Kyung-Bin Song) 대한전기학회 2016 전기학회논문지 Vol.65 No.7

Short-term load forecasting is essential to the electricity pricing and stable power system operations. The conventional weekday 24-hour load forecasting algorithms consider the temperature model to forecast maximum load and minimum load. But 24-hour load pattern forecasting models do not consider temperature effects, because hourly temperature forecasts were not present until the latest date. Recently, 3 hour temperature forecast is announced, therefore hourly temperature forecasts can be produced by mathematical techniques such as various interpolation methods. In this paper, a new 24-hour load pattern forecasting method is proposed by using similar day search considering the hourly temperature. The proposed method searches similar day input data based on the anomalous weather features such as continuous temperature drop or rise, which can enhance 24-hour load pattern forecasting performance, because it uses the past days having similar hourly temperature features as input data. In order to verify the effectiveness of the proposed method, it was applied to the case study. The case study results show high accuracy of 24-hour load pattern forecasting.

문법학습에서 형태초점과 컴퓨터 매개학습의 효과

강동호 ( Dong Ho Kang ) 한국멀티미디어언어교육학회 2004 멀티미디어 언어교육 Vol.7 No.2

농촌관광 체험요인이 즐거움과 행동의도에 미치는 영향: 외국인 관광객을 중심으로

강동호 ( Dongho Kang ) 관광경영학회 2018 관광경영연구 Vol.84 No.-

This study shows effects of experience factors during rural sightseeing on tourists' enjoyment and behavior intention aimed Taiwanese group tourists visiting Korea. Deviation and amusement of the experience factors effects on enjoyment. However amusement and education do not influence on the enjoyment. In addition to it, this research shows enjoyment impacts on tourists' behavior intention. Korean rural sightseeing has defects such as overlapped contents, petty facilities and unsystematic accommodating condition. Rural sightseeing is tourism source that gives chance to foreign tourists experience different cultures of the visiting country. Moreover, it is necessary tourist attraction for invigorating rural tourism. It is expected that plan and strategy to vitalize rural tourism can be established based on this study.

사회인야구 참가자의 여가경험, 여가유능감, 여가몰입, 여가만족 및 심리적 행복감의 관계

강동호(Dong Ho Kang),이웅기(Woong Ki Lee),최영래(Young Lae Choi) 한국사회체육학회 2013 한국사회체육학회지 Vol.0 No.52

The purpose of the study is to suggest the practical data to the leisure staffing in order to expand the base of amateur baseball and attract continued social baseball participation. For this goal, this paper will clarify the relationships among leisure experience, leisure competence, leisure flow, leisure satisfaction and happiness of amateur baseball participant. This paper chose social baseball participant who take part in the social baseball league and a questionnaire was distributed to 400 social baseball participation and a total of 369 through sur-vey after distribution of questionnaire sheet by using convenience sampling. For the analysis of data, frequen-cies analysis, exploratory factor analysis and reliability analysis were executed by using SPSS 17.0 for Windows and confirmatory factor analysis, verification of model suitability and path analysis was made using Amos 7.0. The research results are as follows: First, leisure experience had statistically significant influence on leisure competence. Second, leisure experience had statistically significant influence on leisure flow. Third, leisure experience had not statistically significant influence on leisure satisfaction. Forth, leisure competence had sta-tistically significant influence on leisure satisfaction. Fifth, flow had statistically significant influence on leisure satisfaction. Sixth, leisure competence had statistically significant influence on happiness. Seventh, leisure flow had not statistically significant influence on happiness. Eighth, leisure satisfaction had statistically significant in-fluence on happiness.