수종의 재생 술식 시행이 매식체 근원심부의 골재생에 미치는 영향

이명자,임성빈,정진형,홍기석,Lee, Myung-Ja,Lim, Sung-Bin,Chung, Chin-Hyung,Hong, Ki-Seok 대한치주과학회 2005 Journal of Periodontal & Implant Science Vol.35 No.2

The successful implantation necessitate tissue regeneration m site of future implant placement, there being severe bone defect. Therapeutic approaches to tissue regeneration in the site have used bone grafts, root surface treatments, barrier membranes, and growth factors, the same way being applied to periodontal tissue regeneration. Great interest in periodontal tissue regeneration has lead to research in bone graft, guided-tissue regeneration, and the administration of growth factors as possible means of regenerating lost periodontal tissue. The blood component separated by centrifuging the blood is the platelet-rich plasma. There are growth factors, PDGF, $TGF{beta}1$, $TGF{beta}2$ and IGF in the platelet-rich plasma. The purpose of this study was to study the histopathological correlation between the use of platelet-rich plasma and the healing of bone defect around implant fixture site. Implant fixtures were inserted and graft materials were placed into the left femur of in the experimental group, while the control group received only implant fixtures. In the first experimental group, platelet-rich plasma and BBP xenograft were placed at the implant fixture site, and the second experimental group had platelet-rich plasma, BBP xenograft, and the e-PTFE membrane placed at the fixture site. The degree of bone regeneration adjacent to the implant fixture was observed and compared histopathologically at 2, 4, and 8 weeks after implant fixture insertion. The results of the experiment were as follows: 1. Bone remodeling in acid etched surface near the implant fixture of all experimental groups was found to be greater than new bone formation. 2. Bone remodeling in acid etched surface distant to the implant fixture of all experimental groups was decreased and new bone formation was not changed. 3. Significant new bone formation in machined surface near the implant fixture of bothl experimental groups was observed in 2 weeks. 4. New bone formation in machined surface distant to the implant fixture of both experimental groups was observed. Bone remodeling was significant in near the implant fixture and not in distant to the implant fixture. The results of the experiment suggested that the change of bone formation around implant. Remodeling in machined surface distant to the implant fixture of both experimental groups, and new bone formation and remodeling near the implant fixture were significant.

진화개념의 (進化槪念) 형성에 있어서 유추의 (類推) 영향

이명자,정화숙,김종욱 ( Myung Ja Lee,Hwa Sook Chung,Jong Uk Kim ) 한국생물교육학회 1994 생물교육 Vol.22 No.2

This study was designed to investigate the effectiveness of an analogy and its analogs in solving evolution problems. An analogy was defined as those that include an explanation of the relationships between the target and vehicle domains. A model for instructional analogies was developed. The participants in this study were one hundred and eighty girls high school students. The study consisted of a control group and an experimental group. In the control group, there was no mention of an analogy and instruction was lectured-based. In the experimental group, subjects were receive the analogy with instruction(analogy-based instructions). The treatment period lasted thirty five minutes and concentrated on the topics of evolution. Achievement on evolution was measured for twenty minutes. Analysis of covariance and analysis of variance procedures were; used to analyze the data. The following conclusions were drawn: The results of this study do support the hypothesis that the use of an analogy to teach the concept of evolution does significantly enhance achievement on a evolution concept test.

영재의 동기와 미성취

이명자 ( Myung Ja Lee ),한정숙 ( Jung Sook Han ) 경북대학교 중등교육연구소 2005 중등교육연구 Vol.53 No.3

The major purposes of this study are 1) to examine the cognitive and socio-affective characteristics and needs of gifted students; 2) to investigate the relationship between motivation and giftedness and factors of underachievement in the definitions of giftedness; 3) and finally to explore the strategies to prevent and reverse underachievement in gifted students. The findings reveal that gifted students can not be motivated to excel academically in school without being properly responded to their special needs resulting from their cognitive and socio-affective characteristics. Whether gifted students have a high level of motivation or not, they may be still gifted and the implication that gifted students may be underachieving by environmental or personality constraints has been addressed in some definitions of giftedness. Optimal learning environment for gifted students can partly prevent underachievement of the gifted. Most research of interventions for gifted underachievers have shown limited success, but there is some evidence that modifications on the part of both the student and the school may reverse the underachievement.

PCL / PLA 블렌드의 물성 및 생분해도에 관한 연구

이명자(Myung Ja Lee),이명천(Myung Cheon Lee),신평균(Pyong Kyun Shin) 한국고분자학회 1998 폴리머 Vol.22 No.1

자기조절학습 수준에 따른 인식론적 신념의 차이

이명자 ( Myung Ja Lee ),문병상 ( Byung Sang Mun ) 경북대학교 중등교육연구소 2007 중등교육연구 Vol.55 No.3

협동학습이 자아존중감에 미치는 효과 분석

이명자 ( Myung Ja Lee ),송영명 ( Young Myung Song ),김자림 ( Ja Lim Kim ) 경북대학교 중등교육연구소 2007 중등교육연구 Vol.55 No.2

‘7ㆍ1경제관리개선조치’ 이후 북한영화에 나타난 혁명적 낭만주의와 리얼리즘의 긴장관계

이명자(Lee Myung-ja) 한국학중앙연구원 2008 한국학 Vol.31 No.3

지식의 구조 신념에 따른 수학 문제 해결의 차이

이명자 ( Myung Ja Lee ),문병상 ( Byung Sang Mun ) 경북대학교 중등교육연구소 2008 중등교육연구 Vol.56 No.3

The purpose of this study was to test a difference of children`s knowledge structure beliefs on mathematical problem solving. Epistemic beliefs were consisted of nature of knowledge(certainty of knowledge, simplicity of knowledge) and nature of knowing(source of knowledge, justification of knowing). The subjects of this study were 167 elementary school children. They were assigned to two group according to result of epistemic beliefs test. The scale of epistemic beliefs were consisted of 48 items and mathematical word problem solving test was consisted of 30 items. It was analysed by independent samples t-testing method using SPSS/PC 14.0. Main findings of this study were as follows: Epistemic beliefs affected mathematical word problem solving. Children who had epistemic beliefs of integrated knowledge attained more score, lower reversal error and computation error of mathematical word problem solving than children who had epistemic beliefs of simple knowledge. It were discussed about epistemic beliefs and two approach of mathematical word problem solving.

익산 웅포 찻잎을 이용한 발효차 추출물의 미용효과

이명자(Lee Myung-ja);최두복(Dubok Choi);이희경(Lee Hee-kyung) 국제차문화학회 2021 차문화ㆍ산업학 Vol.52 No.-

본 연구는 전라북도 익산 웅포에서 채취한 찻잎을 이용해서 발효한 차가 미용 화장품 소재로서 가능성이 있는지 검토하기 위해 여러 추출물에 대한 세포독성, 아질산 제거 효과, 티로신아제 활성, 엘라스타아제 활성, 및 콜라겐아제 활성을 각각 분석하였다. 발효차는 유기용매에 의한 추출물의 종류와 관계없이 세포독성이 100, 300 및 500μg/mL 범위의 농도에서도 전혀 존재하지 않았다. 티로신아제 저해 활성은 대조군인 ascorbic acid보다 저해 활성이 낮았지만 여러 추출 중 에탄올 추출물이 가장 우수효과가 나타났다. 콜라겐아제 및 엘라스타아제 저해 효과를 검토한 결과 발효차의 에탄올 및 열수 추출물이 농도 의존적으로 저해 활성이 증가하였다. 따라서 발효차 열수 및 에탄올 추출물은 농도가 증가함에 따라 피부 미용효과도 증가하였다. 특히, 여러 추출 중에서 에탄올 추출물은 미백 및 주름 개선 효과가 다른 추출물보다 높아 기능성 화장품 소재로서 가능성을 나타내었다. 에탄올 및 열수 추출물은 화장품제조 분야에서 사용되는 일반적인 유기용매를 이용한 추출 방법에 비교하면 안전성이 매우 높고 또한 피부에 자극이 낮기 때문에 기능성 화장품 소재로 사용 가능성이 있다고 생각한다. 그러나 미용 화장품 소재로서의 사용하기 위해서는 구체적인 임상에 대한 연구개발이 필요하다. This study analyzed cytotoxicity, tyrosinase, collagenase, and elastase activities using various extracts to examine whether the tea fermented from tea leaves collected from Ungpo, Iksan-si, Jeollabuk-do, could be a cosmetic material for beauty. Fermented tea did not exist at all at concentrations in the 100, 300 and 500μg/mL ranges, regardless of the type of extracts. Tyrosinase inhibitory activity was less active than the ascorbic acid as the positive control group. However, among several extracts, the best effect was shown in ethanol extract. The results of reviewing collagenase and elastase inhibitory effects showed that ethanol and hot water extracts of fermented tea were compared to controls, resulting in concentration-dependent low activity increase. Therefore, hot water and ethanol extractions using fermented tea also increased the skin beauty effects as concentrations increased. In particular, ethanol extract showed higher whitening and wrinkle improvement effects than other extracts, indicating their potential as functional cosmetic materials. Ethanol and hot water extracts of fermented tea are highly likely to be used because they are very safe and less irritating to the skin compared to general organic solvents used in cosmetics manufacturing. However, the specific clinical research and development are needed to use it as a cosmetic material for beauty.

Effect of Green Tea Seed Extract on the Skin Whitening Activity

이명자(Lee Myung-ja);최두복(Dubok Choi);이희경(Lee Hee-kyung) 국제차문화학회 2021 차문화ㆍ산업학 Vol.53 No.-