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오근택,김금진,황충주,박용수,김경남 大韓齒科器材學會 2001 대한치과재료학회지 Vol.28 No.3
Various kinds of orthodontic appliances have been developed for ideal tooth movement during orthodontic treatment. The orthodontic appliances made of metals are bands, arch wires, brackets and miniscrews as orthodontic anchorage. Generally, these appliances are made of stainless steel, pure titanium, Ni-Ti and TMA with the proper biocompatibility. However, localized corrosion of these materials can frequently occur in the particular environment. Super stainless steels, recently developed, have good corrosion resistance to reduce metal ion release induced by many kinds of corrosion. Recently, it has been reported that nickel ion release from orthodontic appliances affect the prevalence of nickel sensitization; however, there has been some controversy about nickel hypersensitivity to orthodontic appliances containing nickel. The purpose of this study was to evaluate and compare the microhardness, nickel ion release, corrosion resistance and cytotoxicity of 4 types of super stainless steels and 316L stainless steel as the control group according to nickel contents, and to determine the acceptability as the new material for various kinds of orthodontic appliances. All super stainless steels showed higher microhardness than 316L stainless steel, SR-3Mo showed especially the highest microhardness. In anodic polarization test, corrosion resistance was high in order of SR-50A, SFSS, SR-6DX, 316L stainless steel, SR-3Mo. There was no increase in nickel ion release from SR-50A, SR-6DX, 316L stainless steel with immersion time in artificial saliva; whereas there was some increase from SFSS and SR-3Mo with immersion time. All super stainless steels showed very low cytotoxicity regardless of nickel contents although SR-3Mo showed relatively higher cytotoxicity than the others. It is concluded that SR-50A among super stainless steels has the highest corrosion resistance and biocompatibility. It is undesirable to consider the alloys with high nickel content to release lots of nickel ion.
대기 중 휘발성 유기화합물의 Advanced Technology에 대한 실험비교
최금찬,안병주,김석택,김찬훈,정창훈,서정민,유수영 동아대학교 환경문제연구소 2000 硏究報告 Vol.23 No.1
Nowaday, Advanced technology has been applied to organic destruction technologies that are alternatives to incineration. Plasma, photolysis, and Photocatalytic oxidation processes are an emerging advanced technologies for the abatement of volatile organic compounds(VOCs) in atmospheric pressure air streams, so we has been used these technologies for destruction of VOCs. TCE, Benzene, Toluene, and Xylene were selected as objective materials. We have been studied each process and found many types of reaction parameters which effect on treatment efficiency. So combination processes, which are plasma-photocatalytic oxidation process and photolysis-photocatalytic oxidation process, have been used to increase destruction efficiency. Analysis of above materials and byproducts was carried out by GC-FID.
집단미술치료와 미술교육이 시설아동의 창의성에 미치는 영향
서금택 ( Kum Taek Seo ),박숙희 ( Sook Hee Park ) 대한아동복지학회 2006 아동복지연구 Vol.4 No.4
본 연구는 집단미술치료와 미술교육 수업이 시설아동의 창의성 향상에 효과가 있는지를 밝히는 것과 미술치료집단과 미술교육집단의 창의성 효과 차이를 밝혀냄으로써 시설아동에게 어떤 수업이 더 효과적인지를 알아내는데 목적을 두고 있다. 본 연구의 대상은 G시에 소재한 아동복지시설의 아동 14명을 미술치료집단과 미술교육집단으로 각각 7명씩 무작위 선정하여, 집단미술치료와 미술교육을 2006년 7월3일-8월25일까지 총8회를 주 1회 1시간씩 실시하였다. 연구 대상자들에게 집단미술치료와 미술교육을 실시한 결과는 다음과 같다. 첫째, 집단미술치료를 활용한 수업이 시설아동들의 창의성 총점, 유창성, 독창성, 제목의 추상성, 성급한 종결에의 저항, 창의적 강점 향상에 효과적인 것이 확인되었다. 이는 시설아동들이 자아에 대해 가지고 있는 마음을 이미지로 표출하려고 하였으며, 자신의 아이디어를 서로 교환하는 과정에서 창의적 사고로 이어 졌다고 볼 수 있다. 둘째, 미술교육을 활용한 수업이 시설아동들의 창의성 총점, 유창성, 독창성의 향상에 효과적이었다. 이는 미술교사들이 발달적 접근을 중요하게 생각하더라도 창의성을 근본목표로 삼고 있다는 것을 의미한다. 셋째, 미술치료집단과 미술교육집단 간의 차이 검증에서는 통계적으로 유의한 차이가 없었으나, 제목의 추상성과 창의적 강점에서는 미술치료집단의 효과가 더 높게 나타났다. 이는 미술치료와 미술교육은 재료와 접근방법이 같으며 미술치료사가 사용하는 언어와 미술교사의 언어가 구분되지 않기 때문에 나타난 결과이다. 결론적으로 시설아동에게 미술을 매체로 한 수업은 창의성을 향상시키는데 효과적이었나, 미술치료와 미술교육의 창의성 총점의 효과성 검증에서는 차이가 없는 것으로 나타났다고 볼 수 있다. The purposes of this study are to identify the effects that group art therapy and art education have on the creativity of children placed in foster homes and to find out which approach is more effective by comparing between art therapy and art education in the difference of creativity improvement. For the study, 14 children were randomly sampled from foster homes in G City and divided into two groups of art therapy and art education, seven in each group. The experiment with two approaches was conducted once a week from July 3 to August 25, 2006, and thus each group completed eight one-hour sessions for the same period. The results from the experiment are as follows: First, the approach of group art therapy was found to be effective for the children to improve creativity, fluency, originality, abstractiveness of titles, resistance to premature closure, and creative strengths. The mind about the ego of children in Foster Homes have has been exposed through images and this has leaded to creative thinking by exchanging their ideas. Second, the approach of art education was determined to be effective in enhancing the creativity, fluency, and originality of children in the group. This result means art teacher had adopted the creativity as the origin aim although they considered development approach is important. Third, the result showed a statistically significant difference from the comparison between the two approaches of art therapy and art education, but the former was more effective in the aspects of abstractiveness of titles and creative strengths. This has resulted due to no classification between the language used by art therapist and art teacher, as the material and the approach are same between art therapy and art education. In conclusion, the use of arts as a medium for teaching appears to be effective in improving the creativity of children in foster homes, but it can be said that there is no significant difference between art therapy and art education in the improvement of total creativity scores.
정금택(Kum-Taek Jeong),이진호(Jin-Ho Lee),서석(Suk Seo),최진영(Jin-Young Choi) 한국정보과학회 2010 한국정보과학회 학술발표논문집 Vol.37 No.1B
안보, 재난, 국가핵심기반 분야에 위기발생시 즉각적인 조치를 위한 ‘위기대응 실무매뉴얼’이 정부기관별로 작성되어 있지만 조치사항에 대한 정량적 검증이 부족하다. 오류가 내포된 조치절차는 피해를 확대 시킬 수 있으므로 위기대응절차에 대한 검증이 요구되며 이를 위해 본 논문에서는 Statemate의 구조적, 기능적, 행위적 관점의 언어를 활용해서 정형기법(formal methods)을 수행함으로써 위기 대응 실무매뉴얼의 모델링 방법을 제안하고 매뉴얼에 기술되어 있는 조치절차의 검증결과를 제시하였다.