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정상교합과 부정교합에서의 상·하악골과 제 1 대구치 위치에 관한 비교연구
윤병모,안병근,이건주,김선해,박영주,한호진 대한치과교정학회 1993 대한치과교정학회지 Vol.23 No.4
There has been so much controversies about the position of upper and lower jaws, and their first permanent molars in normal occlusion and Angle's class ⅠㆍⅡㆍⅢ malocclusions. So, the purpose of this study is to compare the position of upper and lower jaws, and their first molars in normal occlusion and Angle's class ⅠㆍⅡㆍⅢ malocclusions by lateral cephalometric analysis. The sample consisted of one hundred and twenty girls(thirty in each group) who had completed growth. The findings of this study were as follows : 1. In class Ⅰ malocclusion, both maxilla and mandible were slightly posterior position than normal occlusion, but they showed harmonious relationship. 2. In class Ⅱ malocclusion, the mandible was greatly retruded, and the maxilla was also slightly retruded to the cranial base as compared with normal occlusion. 3. In class Ⅲ malocclusion, the maxilla was significantly retruded to the cranial base, but no significant difference was found in mandibular position as compared with normal occlusion. 4. The maxillary first molar was located at posterior position in class Ⅱ malocclusion, and anterior position in class Ⅲ malocclusion to the cranium, so that the rotation of mandible was influenced by that. 5. The mandibular first molar showed constant relationship to the mandible in all four group, but different position to the cranial base in direct proportion to the mandibular position. 6. On the treatment planning of class Ⅲ malocclusion, it seems to be better to promote the mandibular horizontal growth by ingibiting the verbical growth of masillary molar area, and on the treatment planning of class Ⅲ malocclusion, it seems to be better to promote the antero-inferior growth of maxilla and to promote the mandibular vertical growth by inducing the vertical growth of maxillary molar area.
모건웅 ( Geon-ung Mo ),박상운 ( Sang-woon Park ),박명범 ( Myung-bum Park ),최현규 ( Hyun-kyu Choi ),김우찬 ( Woo-chan Kim ),김대엽 ( Daeyoub Kim ),조민재 ( Minjae Cho ) 한국정보처리학회 2020 한국정보처리학회 학술대회논문집 Vol.27 No.2
20세기 이후 대한민국의 중소기업은 큰 성장률을 보인 반면, 정보보안의 중요성에 대한 인식은 크게 개선되지 않아 중소기업에서 이용하는 시스템에 많은 취약점이 존재한다. 이와 같은 취약점을 악용한 해커들의 다양한 자동화 공격 툴로 인해 보안 사고가 꾸준히 증가하는 추세이다. 그러나 중소기업의 특성 상 부족한 예산과 보안 인력의 부재로 실질적인 대응이 어려운 상황이다. 이 프로젝트는 이러한 예산 및 보안 인력의 부재에도 중소기업에서 사용 가능한 보안 솔루션 개발을 목적으로 한다.
치올기 함유 저분자 화합물과의 반응성을 이용하는 간단한 in chemico 피부감작성 시험법의 개발 가능성 평가
김건호 ( Geon Ho Kim ),차동호 ( Dong Ho Cha ),구형모 ( Hyung Mo Gu ),박재성 ( Jae Sung Park ),정재훈 ( Jae Hoon Jeong ),황진선 ( Jin Sum Hwang ),네팔마헤시 ( Mahesh Raj Nepal ),정태천 ( Tae Cheon Jeong ) 한국동물실험대체법학회 2020 동물실험대체법학회지 Vol.14 No.1
For the initiation of skin sensitization reaction, a sensitizer should react with endogenous proteins. During the haptenization of a sensitizer with proteins, it is also possible for a sensitizer to react with small molecules that contain either amino or thiol group, indicating a possibility to develop a simple skin sensitization test using the reactivity of test compounds with thiol-containing low molecular weight compounds. In the present study, 10 compounds that contain a thiol group were pre-tested to determine whether the reactivity with a thiol-detecting monobromobimane would be in concentration-dependent manners. Subsequently, among thiol compounds, a simple spectrofluorometrical method to identify skin sensitizers in chemico was tested with glutathione, an endogenous substance that contains amino and thiol groups. To flurorometrically quantitate the remaining thiol-containing compounds following a reaction with skin sensitizers, monobromobimane was employed. The conditions optimized included: incubation conditions of thiol compounds including glutathione with monobromobimane, molar ratios of thiol compounds to monobromobimane, optimal concentration and incubation time of monobromobimane, and pH and incubation time with test compounds. With a tentatively optimized conditions, 4 skin sensitizers and 2 non-sensitizers were tested to know whether the method could correctly identify skin sensitizers and non-sensitizers. The results indicated a good possibility. Although further optimization is required, it would be a useful screening tool for determining skin sensitization potential of test compounds, because the present method employs a simple endogenous thiol compound as an acceptor for sensitizers with a spectrofluorometric detection system requiring neither experimental animals nor cell cultures.
Hβ- zeolite 촉매상에서 Toluene 의 불균등화 반응
김건중,안화승,박기모 한국공업화학회 1997 응용화학 Vol.1 No.2
In this study, the catalytic activity of H_β-zeolite was examined in the disproportionation of toluene. The catalytic activity and selectivity to p-xylene for the disproportionation of toluene was dependent on the reaction temperature, the type of impregmented ion and the amount of impregmented ion, the type of carrier gas and the time on stream. P₂O_5 loaded H_β-zeolite showed the higher para-selectivity as compared to pure H_β-zeolite. This phenomenon may be interpreted in terms of shape selectivity arising from the partial blocking of pore or acidity modification.