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The effect of cleaning methods on bond strength of zirconia after saliva contamination
심영보,최안나,손성애,정경화,권용훈,박정길 대한치과재료학회 2017 대한치과재료학회지 Vol.44 No.1
This study evaluated the effects of various cleaning methods on the shear bond strength of zirconia ceramics after saliva contamination. Eighty zirconia disk specimens were divided into 8 groups. All groups were treated with one coat of MDP primer. All specimens (except the negative control) were contaminated with human saliva on the zirconia surface. The positive control went through the bonding procedure immediately after contamination without any cleaning procedure. With the exception of control groups, the remaining six groups were rinsed with water and either applied with MDP recoating (WATER+MDP) or without MDP recoating (WATER). While some were cleaned with a Ivoclean with MDP recoating (IVOCLEAN+MDP) or not applied with MDP recoating(IVOCLEAN), others were cleaned with a 1% NaOCl solution with MDP recoating (NaOCl+MDP) or without MDP recoating (NaOCl). The shear bond strength of all specimens were measured after being stored in distilled water at 37°C for 24 hours. The data was analyzed statistically by an analysis of ANOVA, Tukey’s post hoc test and Student’s t-test was used to compare the shear bond strength according to the re-coating of MDP after the cleaning procedure. The positive control group showed the lowest shear bond strength value, and the WATER group and NaOCl group showed no significant difference when compared to the positive control group. The IVOCLEAN group showed significantly higher shear bond strength when compared to Water group and NaOCl group but not with the group of negative control. After rinsing with water or the NaOCl solution, the comparison of the single coating of MDP and re-coating of MDP showed different shear bond strengths but there was no significant difference to the negative control. After rinsing with Ivoclean, there was no significant difference to the negative control regardless of the recoating of MDP. In conclusion, the shear bond strength was affected by the cleansing procedure and Ivoclean was found to be effective regardless of the re-coating of MDP. When water or the NaOCl solution is used to remove surface contaminants, the re-coating of MDP provides a positive effect on cementation.
초등교사의 교수관심에 관한 연구 : 교원평가 시범운영 학교와 비 시범운영 학교 교사의 비교
심영보 부산대학교 교육발전연구소 2007 敎育硏究 Vol.17 No.1
교육의 질적 수준을 가늠하는 데는 교사의 자질과 능력이 중요한 요인 중 하나이다. 교사의 자질과 능력은 직전교육과 현직교육을 포함한 교사교육에 의해 좌우된다. 최근 우리나라에서는 교사교육의 내실화를 위해 교사 임용제도를 개선하려는 노력을 하고 있으며 다른 한편으로 교원 평가제도를 ‘능력개발형’으로 전환하려는 노력을 하고 있다. ‘능력개발형’ 교원 평가제도는 기존 근무성적평정제가 인사관리를 위한 단순한 기능만을 수행할 뿐 교사의 전문적 성장과 질 향상에 도움이 되지 않는다는 비판을 받고 있다(김이경, 김갑성, 김도기, 김순남, 2006: 150). 또한 교사는 교직생활 전 기간을 통해 다양한 영역에서 변화․발전하기 때문에 평가제도를 단순히 능력개발형으로 바꾸는 것으로 그 효율성을 확보하기 어렵다. 따라서 교사의 자질과 능력을 높이기 위해 발달적 관점을 적용해야 한다는 주장이 제기되고 있다(김병찬, 2007; 백승관, 2003; 이난숙, 1992; 이병진, 1996).
심영보,임재현,신재욱,신동우,한병철,천정현,서상렬,한연석,조이대 대한내과학회 2001 대한내과학회지 Vol.61 No.2
Acute disseminated encephalomyelitis (ADEM) is an acute inflammatory demyelinating disease of central nervous system, and is related to allergic or immune-mediated reaction to systemic viral infection or vaccination, which is usually self limited monophasic illness. As the clinical manifestations or laboratory findings is nonspecific, it is diagnosed by brain magnetic resonance imaging (MRI) showing multiple foci of increased T2 signal within white matter. We report the clinical and radiologic imaging findings in a 36-year-old man in whom acute disseminated encephalomyelitis developed after serologically proven herpes infection combined with liver abscess. His clinical course, despite without corticosteroid or plasmapheresis because of liver abscess, was shown spontaneous remission.(Korean J Med 61:215-220, 2001)
Switchable Multiwavelength Filter Based on a Hybrid Sagnac Interferometer
심영보,한영근 한국물리학회 2012 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.60 No.8
A switchable multichannel filter based on a hybrid Sagnac interferometer was proposed and experimentally demonstrated. The hybrid Sagnac interferometer was realized by inserting a sampled fiber Bragg grating (SFBG) into a fiber loop mirror by using a polarization-insensitive 3-dB coupler. By using a beam scanning technique, we fabricated a sampled fiber Bragg grating by exposing a photosensitive fiber to a frequency-doubled 244-nm Ar+ laser. The fabricated SFBG had multiple reflection peaks corresponding to the chirp ratio and the spacing of grating. The multiple peaks in the hybrid Sagnac interferometer could be controlled by changing the relative phase difference between two counter-propagating signals. The transmission characteristics of the proposed switchable multichannel filter were analyzed by using a Jones matrix method. Consequently, a switchable multichannel filter based on a sampled fiber Bragg grating incorporating a Sagnac interferometer could be achieved.