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Metal bracket과 ceramic bracket의 전단 결합 강도와 debonding 상태에 관한 연구
윤정진(Jung-Jin Yoon),유영규(Young-Kyu Ryu) 대한치과교정학회 1992 대한치과교정학회지 Vol.22 No.2
Metal brackets and ceramic brackets were bonded to natural teeth, porcelain crowns and gold crowns. After stored in artificial saliva solution for 72 hours at 37°C, the shear bond strengths were measured by Instron and compared with them, the bonding sites and bracket bases were examined by scanning electron microscope and light optical stereomicroscope. The results were as follows: 1. The shear bond strengths of the group which metal brackets were bonded to natural teeth and the groups which ceramic brackets were bonded to natural teeth and porcelain crowns were comparable to each other, the shear bond strength of the group which metal brackets were bonded to gold crowns was significantly low. 2. The bond failed predominantly at the bracket base/adhesive interface with the bulk of adhesive remaining on enamel in the group which metal brackets were bonded to natural teeth. 3. The bond failed consistently at the crown/adhesive interface with all of adhesive remaining on the bracket bases in the group which metal brackets were bonded to gold crowns. 4. The bond failed at the enamel or crown/adhesive interface with the bulk of adhesive remaining on the bracket bases in the groups which cramic brackets were bonded to natural teeth and porcelain crowns. 5. The shear bond strengths of the groups which ceramic brackets were bonded to porcelain crowns were not affected by etching time.
문화예술 중심 인성교육교양강좌를 개발하기 위한 프로그램 구성
윤미승(Yun, Mi Seung),윤정진(Yoon, Jeong Jin) 동명대학교 산학협력단 창의인성연구소 2020 교육과 문화 Vol.2 No.2
본 연구는 창의인성 큐레이션 C-crepe를 활용하여 대학생의 ‘문화예술 중심의 인성교육 교양강좌 운영을 위한 온라인 상호작용 요소(C-mooc 상호작용 요소)를 탐색 하고자 한다. C-mooc은 본 연구자들에 의해 기 개발된 창의·인성 디지털 큐레이션(C-crepe, http://crepe.tu.ac.kr)을 기반한 공개강좌 콘텐츠를 의미하는 것이다. C-mooc 상호작용 모형 개발을 위해 창의·인성 디지털 큐레이션 C-crepe에서 실행되고 있는 상호작용 유형과 K-MOOC 상호작용에서의 요구를 분석하여 이를 통해 문화예술 중심의 인성교육 교양강좌를 운영하기 위한 최적화된 C-mooc 상호작용 모형을 개발하고자 한다. 본 연구에서 개발한 C-mooc 상호작용 요소는 3가지 영역으로 구성하였다. 첫째, 학습자-콘텐츠 영역으로 인성적 요소를 반영한 주제별 다양한 콘텐츠를 스스로 선택하도록 구성하여 학습자의 자율성을 강조하였다. 둘째, 교수자-학습자 영역으로 각기 다른 전공의 교수자들이 각기 다른 주제별 콘텐츠를 운영함으로써 학습자는 주제에 따른 교수자를 만나게 된다. 즉 하나의 교양강좌에서 다양한 전문가를 만날 수 있도록 하여 온라인강좌의 지루함을 최소화하고 수업에 흥미를 유발하도록 하였다. 셋째, 학습자-학습자 영역에서는 온라인 토론과 동료평가뿐 아니라 온라인 강좌를 수강 후 팀별 오프라인 활동을 수행하도록 함으로써 지식을 종합하고 전이할 수 있도록 구성하였다. The purpose of this study is to develop an online interaction model (C-mooc interaction model) for college students Culture and Arts-oriented character education liberal arts lectures by utilizing C-crepe. C-mooc means open lecture contents based on the creative and personal digital curation (C-crepe, http://crepe.tu.ac.kr) developed by the researchers. To develop C-mooc interaction model, analyze creative and personality digital curation C-crepe s interaction type and needs in K-MOOC interaction. We want to develop an optimized C-mooc interaction model. The C-mooc interaction model developed in this study is composed of three areas. First, the autonomy of the learner was emphasized by constructing the content to be selected by subject, which reflects human factors as the learner-content area. Second, in the area of instructor-learner, instructors of different majors operate different subject-specific content, so that learners meet instructors according to the subject. In other words, by allowing various experts to meet in one liberal arts class, the boredom of the online class is minimized and interest is created in the class. Third, in the learner-learner area, not only online discussion and peer evaluation, but also offline courses for each team after taking an online course are organized to synthesize and transfer knowledge.
한경윤,박준봉,정진형,정종평,Han, Kyung-Yoon,Park, Jun-Bong,Chung, Jin-Hyung,Chung, Chong-Pyoung 대한치주과학회 1994 Journal of Periodontal & Implant Science Vol.24 No.3
To evaluate the periodontal status of Korean adults, 3,988 adults(20-69 years old) who lived in Kwangju, Chonnam, Taegu, and Kyungbuk districts were periodontally examined by plaque index(PI), calculus index(CI), gingival index(GI), periodontal disease index (PDI), and papillary bleeding index(PBI). The periodontal examination charts were grouped according to age and sex. And subsequently 200 periodontal examination charts in each age group were randomly selected according to sex. The differences of the indices among age groups and those between male and female in each age group were statistically analyzed by Chi-Square test. In PI, CI, GI, PDI, and PBI, there was no statistical significance in the difference between male and female in each age group(p>0.05). In male, PI of 60s age group($1.44{\pm}0.68$) was significantly higher than that of any age group(p<0.05), and in female PI of 20s age group($0.86{\pm}0.39$) was significantly lower than that of any other age group(p<0.05). CI of 60s age group in both male($1.67{\pm}0.70$) and female($1.63{\pm}0.91$) was significantly higher than that of any age group(p<0.05). GI of 20s age group in both male($0.85{\pm}0.66$) and female($0.67{\pm}0.60$) was significantly lower and GI of 60s age group in both male($1.37{\pm}0.60$) and female($1.44{\pm}0.84$) was higher than that of any age group(p<0.05). PDI in male was the lowest in 20s age group($0.70{\pm}0.73$), and was the highest in 60s age group($4.93{\pm}1.96$) (p<0.05). In female PDI of 20s age group($0.71{\pm}0.74$) was significantly lower than that of any age group(p<0.05). In male PBI of 20s age group($0.38{\pm}0.31$) was significantly lower than that of any age group(p<0.001). PBI in female was the lowest in 20s age group($0.35{\pm}0.30$) (p<0.001), and was the highest in 60s age group($1.09{\pm}0.76$) (p<0.05). The data insist that all the young populations of 20s age group should be interested in routine check for early diagnosis and prevention of periodontal disease, and a special education program of periodontal health care for young generation must be prepared, and the periodic recall check system for periodontal examination of middle age group must be supported by government.
급속 충전 알고리즘에 따른 전기자동차 배터리 성능 비교 평가
윤효정(Hyojung Yoon),김태훈(Tae-Hoon Kim),정진범(Jin-Beom Jeong) 한국자동차공학회 2021 한국자동차공학회 부문종합 학술대회 Vol.2021 No.6
최근 높은 판매율을 보이고 있는 전기자동차는 성능, 연료 유지비 등에 대한 이용자 만족도가 상당히 높은 반면, 전기차 충전 불편과 인프라 부족은 아직까지도 구매의 걸림돌로 작동하고 있다. 따라서 전기차 충전 불편 문제 해소를 위해서는 근본적 문제인 배터리의 성능 해결 방안과 전기차를 빠르고 편리하게 충전할 수 있는 실질적 해소 방안에 대한 연구가 병행되어야 한다. 근본적 문제 해결 방안으로는 고율 충전이 가능한 배터리의 소재 개발이 이루어지고 있으며, 이와 동시에 응용 기술 중의 하나인 충전 성능을 향상시킬 수 있는 급속 충전 제어 기술을 개발하여 이용자들이 당면한 실질적 문제 해결이 필요하다. 본 연구에서는 국내에 양산, 보급된 전기차들을 고려하여, 실사용에 유의미한 전기차 충전 시간 단축을 위해 10분 충전으로 100km 주행이 가능한 급속 충전 알고리즘 개발에 대하여 논한다. 전기차 배터리 상태를 고려하여 충전 시간을 단축할 수 있는 총 4가지(3/4-step MSCC, PC, CC)충전 알고리즘의 제안 및 비교 평가를 통해 이들의 타당성을 검증한다. 이를 위해 최적 충전 알고리즘 적용에 따른 배터리 성능 및 수명 영향도를 정량적으로 평가할 수 있는 표준 시험법 및 RPT 시험법을 정립하며, 이를 기반으로 전기차 셀을 대상으로 평가·검증한다. 또한 현재 출시된 전기차의 급속 충전 알고리즘을 분석하여, 이를 기준으로 제안된 알고리즘의 유효성을 확인하여 최적의 충전 알고리즘을 선정한다. 선정된 알고리즘은 향후 열 관리 시스템을 고려하여 모듈 및 팩 레벨까지 확대 적용하여 실차 적용 적절성을 검증할 예정이다.
유색감자 자영과 홍영을 이용한 제면 특성 및 항산화 활성
홍윤기 ( Yoon Ki Hong ),정화빈 ( Hwabin Jung ),김상민 ( Sang Min Kim ),판철호 ( Cheol Ho Pan ),남정환 ( Jung Hwan Nam ),조지홍 ( Ji Hong Cho ),권오근 ( Oh Keun Kwon ),정진철 ( Jin Cheol Jeong ),이재권 ( Jae Kwon Lee ),윤원병 ( Won 충북대학교 과학교육연구소 2014 과학교육연구논총 Vol.29 No.1
The experiment was conducted to change physical properties and antioxidant activity of flour noodle and boiled flour dough that added coloured potato (Hongyoung and Jayoung) powder(RF and PF) and starch(RSF and PSF). when coloured potato was added to dough, the flavor and texture of its noodle are better than noodle made by wheat flour (WF). The hardness, gumminess and chewiness of dough added coloured potato flour showed higher value than wheat flour dough. The total phenolic compound of dough added coloured potato flour was 3.7-5.8 times higher than boiled wheat flour dough. Additionally, DPPH scavenging acvitity was 1.5-1.6 times higher than boiled weat flour dough. It indicate that manufacturing noodle with coloured potato flour present better quality than wheat flour that was generally used for manufacturing noodle.