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최은비 ( En-bi Choi ),김요정 ( Yo-jung Kim ),박준희,남태광,서정욱 ( Jeong-wook Seo ) 한국목재공학회 2022 한국목재공학회 학술발표논문집 Vol.2022 No.1
목재의 연대분석(벌채연도, 고사연도 등)을 위한 방법에는 연륜연대측정법, 산소동위원소비 연륜연대측 정법, 방사성탄소연대측정법이 있다. 이 가운데 나이테 폭의 변동패턴을 이용하여 1년 단위로 연대분석이 가능한 연륜연대측정법이 흔히 활용되고 있다. 산소동위원소비 연대측정법은 나이테의 안정산소동위원소비(O<sup>18</sup>/O<sup>16</sup>)를 측정하여 작성한 연대기를 이용하는 방법이다. 이 방법은 연륜연대측정법에 비해 분석기간이 길고 파괴분석이라는 단점이 있다. 하지만 이미 국내에서도 발표된 바와 같이(서정욱 외., 2017; 최은비, 2019) 개체 및 수종 차이에 영향을 받지 않으며, 멀리 떨어진 지역 간에도 활용할 수 있음이 확인되었다. 따라서 본 발표에서는 이러한 산소동위원소비 연륜연대측정법의 특징을 이용하여 국내 고목재의 연대분석에 활용 가능성을 제시하고자 한다. 본 발표는 국립경주문화재연구소의 지원을 받아 수행된 연구임(“경주월성 종합학술연구”, NRICH-2205-B04F-1) 1) 서정욱 외. 2017. 지리산국립공원 아고산대 주요 수종(주목, 잣나무, 구상나무, 신갈나무)에 대한 산소동위원소연대기 작성 및 기후와의 관계 분석. 목재공학 45(5): 661-670 2) 최은비. 2019. 산소동위원소연륜연대기와 연륜연대기 상호간 비교-임목·수종·지역 상호간 일치도를 중심으로-. 충북대학교 석사학위논문.
Synthesis and Characterization of Biodegradable Photocurable Surgical Guide by 3D Printing
최은비,정일두 한국공업화학회 2018 한국공업화학회 연구논문 초록집 Vol.2018 No.0
Nowadays, photocurable resin for 3D printing is used in various field. 3D printable dental materials were synthesized by DLP method, which is an advantage of fine-tuning in micro units. Resins for surgical guide need strong compressive strength, wide ranges of workable temperature, low shrinkage. In addition, it is the goal of this research to make environmentally friendly materials with biodegradability because they are made customized for patients, used for surgery or disposable during surgery and discarded. In this study, in order to get better chemical and mechanical properties, polycaprolactone, aliphatic polyester, was used to synthesize photocurable 3D printable oligomers with methacryloyl chloride, and hybridized with silica nanoparticles, which was surface modified with vinyl-trimethoxysilane (VTMS), and evaluated its compressive and flexural strengths after it was fabricated by 3D printing using DLP method.
최은비,정유진,이동엽,홍지헌,유재호,김진섭,김성길 대한물리의학회 2022 대한물리의학회지 Vol.17 No.2
PURPOSE: This study investigated the immediate effects of gluteus medius strengthening training and relaxation therapy on the static balance, muscle strength asymmetry, and proprioception. METHODS: In this research, 38 healthy adults were assigned randomly to strengthening groups (SG) and relaxation groups (RG). The static balance, muscle strength asymmetry, and proprioception were measured as a pre-measurement. The same measurements were performed after the intervention and follow-up. An independent sample t-test was used to compare each group, and one-way repeated ANOVA was used to compare the changes within the group. RESULTS: In the static balance, the comparison between groups SG was more significant than RG, and only SG showed significant differences in the intra-group comparisons. There was no significant difference in muscle strength asymmetry between SG and RG. On the other hand, the comparison within the group revealed only SG to be significant. In proprioception, SG produced more significant results than RG, and only SG had significant values in the within-group comparison. CONCLUSION: Strengthening training affects the changes in static balance, muscle strength asymmetry, and proprioception.
Synthesis and Characterization of 3D Printable Photocurable Dental Resin Based on Catechol
최은비,신은진,정일두 한국공업화학회 2018 한국공업화학회 연구논문 초록집 Vol.2018 No.0
Efforts to apply the adhesive properties of mussel proteins to the biomedical field have been performed for a long time, and positive results have also been reported. Therefore, it is expected that the adhesive ability of the catechol group will give excellent physical properties to restorative dental materials. We have devised an oligomer that incorporates catechol into the conventional dental material. Bisphenol A glycidylmethacrylate (BisGMA) has been used for restorative materials because of many advantages such as higher mechanical property, low volatility, low polymerization shrinkage. In this study, protocatechuate-BisGMA (PCA-BG) was synthesized by reacting BisGMA and protocatechuic acid (PCA) containing catechol group, and evaluated its compressive and flexural strengths after it was fabricated by 3D printing using DLP method.
< 구두-B-10 > 일본 산소동위원소연대기를 이용한 울산 반구동 유적 출토 고목재의 연대측정
최은비,김요정,( Massaki Sano ),박준희,서정욱 한국목재공학회 2018 한국목재공학회 학술발표논문집 Vol.2018 No.1
국내에서 연륜폭을 기반으로 작성된 최장 대표연륜연대기는 약 900년(1126년-현재)으로 소나무(Pinusdensiflora) 고목재와 현생목을 이용하여 구축된 것이다. 따라서 13세기 이전의 고목재 연대를 표준연륜 연대기를 활용하여 분석하는 것이 불가능한 현실이다. 이러한 이유로 13세기 이전의 고목재 연대측정은 방사성탄소동위원소 분석에 의존하고 있다. 최근 발표된 연구에 의하면 목재의 각 연륜에서 측정한 산소동위원소의 비율(δ<sup>18</sup>O)로 작성한 연대기는 연륜폭으로 작성된 연대기보다 수종 간, 개체 간 일치도가 높으며, 더 나아가 일본 북서지방의 산소동위원소연대기와도 유사한 패턴을 가진 것으로 확인되었다 (Seo et al., 2017). 본 연구는 울산 반구동에서 출토된 13세기 이전으로 추정되는 고목재의 산소동위원소비연대기를 작성하여 일본의 산소동위원소비연대기와 비교하여 정확한 연대측정이 가능한지를 확인하고자 실시되었다. 연구에 사용된 고목재는 울산 반구동 유적에서 출토된 중심목주이다. 울산 반구동 유적은 대형 목책시설로, 고대의 목책구조를 그대로 보여주고 있어 그 의미가 매우 크다. 방사성탄소동위원소 분석으로 확인된 반구동 유적에 위치한 목축조성시기는 A.D. 879±50년(신뢰구간 95.4%)이었다(정아름, 2011).
인적오류가 관여된 철도 사고의 체계적 분석을 위한 FRAM의 활용
최은비,함동한 대한안전경영과학회 2020 대한안전경영과학회지 Vol.22 No.1
There has been a significant decline in the number of rail accidents in Korea since system safety management activities were introduced. Nonetheless, analyzing and preventing human error-related accidents is still an important issue in railway industry. As a railway system is increasingly automated and intelligent, the mechanism and process of an accident occurrence are more and more complicated. It is now essential to consider a variety of factors and their intricate interactions in the analysis of rail accidents. However, it has proved that traditional accident models and methods based on a linear cause-effect relationship are inadequate to analyze and to assess accidents in complex systems such as railway systems. In order to supplement the limitations of traditional safety methods, recently some systemic safety models and methods have been developed. Of those, FRAM(Functional Resonance Analysis Method) has been recognized as one of the most useful methods for analyzing accidents in complex systems. It reflects the concepts of performance adjustment and performance variability in a system, which are fundamental to understanding the processes of an accident in complex systems. This study aims to apply FRAM to the analysis of a rail accident involving human errors, which occurred recently in South Korea. Through the application of FRAM, we found that it can be a useful alternative to traditional methods in the analysis and assessment of accidents in complex systems. In addition, it was also found that FRAM can help analysts understand the interactions between functional elements of a system in a systematic manner.