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Water-assisted extrusion of bio-based PETG/clay nanocomposites
이나은,이상묵 한국유변학회 2018 Korea-Australia rheology journal Vol.30 No.1
Bio-based polyethylene terephthalate glycol-modified (PETG)/clay nanocomposites were prepared using the water-assisted extrusion process. The effects of different types of clay and clay mixing methods (with or without the use of water) and the resulting nanocomposites properties were investigated by measuring the rheological and tensile properties and morphologies. The valuable properties were achieved when Cloisite 30B was mixed in a slurry state. The results of the X-ray diffraction (XRD) and transmission electron microscopy (TEM) studies showed that the nano-clay was well dispersed within the PETG matrix. This shows that the slurry process could be an effective exfoliation method for many nanocomposites systems as well as for bio-based PETG/clay nanocomposites.
쉐도윙(Shadowing) 학습법이 중학생의 영어 구어 능력 향상에 미치는 영향
이나은,이화자,장동식 현대영미어문학회 2010 현대영미어문학 Vol.28 No.4
The purpose of this study is to investigate middle school students' listening and speaking skills improvement under the instruction of shadowing method. The experiment on this study is conducted to three groups for eight weeks: the general method group, the group-shadowing group, and self-directed shadowing group. The learners' listening and speaking ability are tested before and after the experiment. The main findings of the study are as follows: 1) learners’ listening ability is influenced by shadowing method. 2) students' use of suprasegmentals are improved by shadowing method. This improvement has a positive impact not only on listening but also on pronunciation. 3) shadowing method enables students to improve accuracy in grammar and vocabulary use, and to catch up with the speed of the text. 4) shadowing method under independent study environment brings a greater positive impact than group study environment. Bringing multimedia into a classroom maximizes the effect of combining shadowing and independent study.
Microbiota in T-cell homeostasis and inflammatory diseases
이나은,김완욱 생화학분자생물학회 2017 Experimental and molecular medicine Vol.49 No.-
The etiology of disease pathogenesis can be largely explained by genetic variations and several types of environmental factors. In genetically disease-susceptible individuals, subsequent environmental triggers may induce disease development. The human body is colonized by complex commensal microbes that have co-evolved with the host immune system. With the adaptation to modern lifestyles, its composition has changed depending on host genetics, changes in diet, overuse of antibiotics against infection and elimination of natural enemies through the strengthening of sanitation. In particular, commensal microbiota is necessary in the development, induction and function of T cells to maintain host immune homeostasis. Alterations in the compositional diversity and abundance levels of microbiota, known as dysbiosis, can trigger several types of autoimmune and inflammatory diseases through the imbalance of T-cell subpopulations, such as Th1, Th2, Th17 and Treg cells. Recently, emerging evidence has identified that dysbiosis is involved in the progression of rheumatoid arthritis, type 1 and 2 diabetic mellitus, and asthma, together with dysregulated T-cell subpopulations. In this review, we will focus on understanding the complicated microbiota-T-cell axis between homeostatic and pathogenic conditions and elucidate important insights for the development of novel targets for disease therapy.
이나은,허주리,갈병석,박재범 한국방재학회 2016 한국방재학회논문집 Vol.16 No.2
Urban inundation problem in the coastal city adjacent to rivers or the sea causes more damage than the problem on inland city. Because the sea level is applied to the external water level conditions, the precipitation of the prevention capacity target against disasters below the average rainfall increases possibility of the inundation. Study area was constructed by the Storm Water Management Model(SWMM). Construction Model was to create a graph of sea level rise and probable precipitation estimated for various return period. As a result, there are differences of probable precipitation by each duration. For example, if overflow rate is decrease by 30 percent, the precipitation of the prevention capacity target against disasters has to be reduced between 9.0 percent and 16.4 percent. In addition, if overflow rate is decrease by 50 percent, the precipitation has to be reduced between 15.7 percent and 26.9 percent. The results of this study can be utilized to determined sea level rise is taken into account prevention Capacity target against disasters estimate data due to climate change. 도시의 내수침수 문제는 내륙도시보다 하천이나 바다에 인접한 연안도시에서 더 큰 피해를 야기하고 있다. 이는 해수면이 외수위 조건으로 작용하기 때문에 기존 방재성능목표 강우량 이하의 강우량 발생 시에도 침수발생 가능성을 높인다. 따라서 도시유역의 유출모델인 SWMM을 이용하여 대상유역으로 선정된 연안도시에 대하여 모형을 구축하고 이를 통해 해수면 상승과 확률강우량간의 변화 곡선을 작성하여 재현기간별 확률강우량을 산정하였다. 그 결과, 확률강우량에 대한 지속시간별 차이는 있었으나 침수 발생량 30% 저감시 현재 설정된 방재성능목표 강우량이 9.0~16.4% 낮아져야하며 침수발생량 50% 저감시에는 15.7~26.9% 낮아져야하는 것으로 나타났다. 본 연구 결과를 토대로 기후변화에 따른 해수면 상승이 고려된 방재성능목표 강우량 산정 자료로 활용될 수 있을 것으로 판단된다.
이나은,마경탁,배형원,홍사민,성공제,홍영재,김찬윤 대한안과학회 2015 Korean Journal of Ophthalmology Vol.29 No.2
Purpose: To compare the surgical results of trabeculectomy and Ahmed glaucoma valve implantation after a previous failed trabeculectomy. Methods: A retrospective comparative case series review was performed on 31 eye surgeries in 20 patients with primary congenital glaucoma who underwent trabeculectomy or Ahmed glaucoma valve implantation after a previous failed trabeculectomy with mitomycin C. Results: The preoperative mean intraocular pressure was 25.5 mmHg in the trabeculectomy group and 26.9 mmHg in the Ahmed glaucoma valve implantation group (p = 0.73). The 48-month postoperative mean intraocular pressure was 19.6 mmHg in the trabeculectomy group and 20.2 mmHg in the Ahmed glaucoma valve implantation group (p = 0.95). The 12-month trabeculectomy success rate was 69%, compared with 64% for Ahmed glaucoma valve implantation, and the 48-month success rates were 42% and 36% for trabeculectomy and valve implantation, respectively. The success rates following the entire follow-up period were not significantly different between the two groups (p > 0.05 by log rank test). Postoperative complications occurred in 25% of the trabeculectomy-operated eyes and 9% of the Ahmed-implanted eyes (p = 0.38). Conclusions: There was no significant difference in surgical outcome between the trabeculectomy and Ahmed glaucoma valve implantation groups, neither of which had favorable results. However, the trabeculectomy group demonstrated a higher prevalence of adverse complications such as post-operative endophthalmitis.