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탄소나노튜브가 첨가된 탄소섬유 부직포로 강화된 에폭시 복합재료의 전기적, 기계적 특성
최다희,최준,KIMKI YOUNG 한국섬유공학회 2019 한국섬유공학회지 Vol.56 No.4
Carbon nanotube (CNT) materials have excellent mechanical, thermal, and electrical properties that make them interesting for their potential applications in the electronics and aerospace industries. In particular, carbon nanotube paper (CNP)/polymer composites are potential candidates for lightweight multi-functional structural materials with high mechanical performances. CNP can be fabricated by filtering aqueous suspensions of CNT. We confirm that carbon aqueous dispersion can be manufactured using ultrasonication. Our results showed dramatic improvements in electrical conductivity with a percolation threshold ~0.2% of CNT. By significantly improving the dispersion of CNT, we showed that only a very small amount of CNTs were needed to achieve the conductivity levels required for different electrical applications. In addition, we demonstrated that the aqueous dispersion of carbon fiber (CF) could be achieved using an ozone treatment; we also determined that CNT/CF paper could be fabricated by the wet laying of mixed CNT/CF aqueous dispersion as well. CNT/CF papers were embedded in epoxy resin by a resin infusion process to realize CNT/Epoxy composites. We also addressed the electrical conductivity measurements of CNT/CF paper as well as the mechanical properties of the paper and their polymer composites.
최다희,이재철,KIMKI YOUNG 한국섬유공학회 2019 한국섬유공학회지 Vol.56 No.3
In this paper, carbon felt was produced by carbonizing and graphitizing Oxi-PAN fiber (oxidized polyacrylonitrile fiber, stabilized fiber) nonwoven fabric. The physical, mechanical and electrical properties of the carbon felt produced in this way were compared with those of commercialized carbon fiber felt for conventional Redox Flow Battery. As the GSM of Oxi-PAN increased, the porosity and pore size decreased. The GSM after carbonization of the prepared Oxi-PAN felt sample was reduced by about 40%, but the differences according to the carbonization and graphitization temperature conditions showed little change in all the basic characteristics except electrical resistivity and tensile characteristics. The specific resistivity was reduced to 1.25 Ω · mm at 2000 ° C compared to about 2.05 Ω · mm at 1000 ° C based on the Oxi-PAN 900 GSM sample. Compared with commercial products, carbon felt made with Oxi-PAN 900 GSM is considered to be the best electrode.
자기조절 전략교수가 학습장애 학생의 주장하는 글쓰기 능력에 미치는 영향
최다희,김애화 한국학습장애학회 2013 학습장애연구 Vol.10 No.2
The purpose of this study was to investigate the effect of Self-Regulated Strategy Development on persuasive writing of students with learning disabilities. The participants were three 5th-6th grade students with learning disabilities. The AB design was repeatedly employed across three participants. Major results are as follow. First, the number of essay parts increased. Second, the number of words written and the number of sentences also increased. Third, all students evidenced improvement in the quality of their essays. Gains were maintained on maintenance probes. The summary of the results and limitations of this study were discussed. 본 연구에서는 자기조절 전략교수가 학습장애 학생의 주장하는 글쓰기 능력에 미치는 효과를 알아보고자 하였다. 이를 위해 쓰기 학습장애를 지닌 초등학교 5, 6학년 학생 3명을 대상으로 AB설계를 적용하여 기초선, 중재, 유지 순으로 실험을 실시하였다. 주요 연구 결과를 요약하면 다음과 같다. 첫째, 학습장애 학생에게 자기조절 전략교수를 하였을 때 주장하는 글쓰기의 구성요소 수가 증가하였다. 둘째, 학습장애 학생에게 자기조절 전략교수를 하였을 때 총 어절 수 및 총 문장 수가 증가하였다. 셋째, 학습장애 학생에게 자기조절 전략교수를 하였을 때 주장하는 글의 질이 향상되었다. 넷째, 중재 효과가 중재가 끝난 이후에도 유지되는 것으로 나타났다. 본 연구 결과의 요약, 연구 결과의 제한점 및 향후 연구에 관한 제언이 논의되었다.
Anti‑inflammation activity of brazilin in TNF‑α induced human psoriasis dermatitis skin model
최다희,황형서 한국응용생명화학회 2019 Applied Biological Chemistry (Appl Biol Chem) Vol.62 No.5
Psoriasis is a chronic inflammatory skin disease that causes erythema, scale, and invasion due to excessive proliferation of keratinocyte and vascular deformation of the upper part of the dermis. Recently, it has been reported that brazilin, an active compound of Caesalpinia sappan L., possesses anti-inflammatory activity in mouse macrophage. However, little is known about its effect or anti-inflammatory activity on psoriasis dermatitis. Thus, the objective of this study was to determine anti-inflammatory activity of brazilin in TNF-α-induced human keratinocyte (HaCaT) widely used as a model of psoriatic dermatitis. First, CCK-8 assay was performed to determine cytotoxicity of brazilin in HaCaT cells and cytotoxicity was not observed up to 7 μg/mL concentrations. Brazilin decreased mRNA expression levels of inflammatory cytokines such as IL-1α, IL-1β, IL-6, IL-8 and TNF-α in a concentration dependent manner. Brazilin also significantly reduced phosphorylation of I-κB, Akt, and MAPKs such as ERK, JNK, p38 and STAT3 in immortalized human keratinocytes (HaCaT) induced by TNF-α. In addition, inflammation causes the weakness of the skin barrier structure and increase cell permeability, stimulating serious problems in skin moisturizing. Thus, we observed changes of skin permeability in TNF-α induced inflammatory condition through transepithelial electrical resistance (TEER) assay. While TNF-α induced inflammation caused reduction of TEER value (ohm (Ω) × cm2), it was recovered by treatment with brazilin in a concentration-dependent manner. These results strongly imply that brazilin can reinforce the skin barrier due to its anti-inflammatory activity. Therefore, brazilin could be a promising candidate for treating psoriasis dermatitis.
ZEPETO를 통한 패션 브랜드 경험이 브랜드 태도와 오프라인 패션 제품 구매의도에 미치는 영향 - 한국과 중국의 10-20대 소비자를 중심으로 -
최다희,송수민,장등예,고리,신은정 한국의류산업학회 2022 한국의류산업학회지 Vol.24 No.5
This study aims to determine the effects of the experiences of ZEPETO platform users on their attitudes and purchase intentions. A survey on 10–20 Korean and Chinese virtual fashion consumers was conducted. Brand experiences were independent variables, and offline purchase was the dependent variable. The results showed that, first, among the four factors of the brand experience, Korea and China have the highest explanatory power. Second, the brand experience of Korean consumers significantly impacted their brand attitude. Additionally, cognitive and emotional experiences of the brand positively impacted their brand attitude. Third, the brand experience of Chinese consumers significantly affected their brand attitude, and among the sub-factors of brand experience, cognitive experience positively affected brand atti- tude. Fourth, the brand experience of Chinese consumers significantly influenced their offline purchase intention, and among the sub-factors of brand experience, cognitive experience positively influenced their offline purchase intention. Overall, an emotional branding strategy that provides brand and product information must be implemented for the Korean market encouraging consumers to develop a positive and emotional connection with the brand. The Chinese market would benefit from formulating a reliable branding strategy that easily provides a wide range of brand and product infor- mation focusing on cognitive experiences.