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생체조직공학적 응용을 위한 폴리감마글루탐산 다공성 지지제의 제조
전현애(Hyeon Ae Jeon),이승욱(Seung Wook Lee),권오형(Oh Hyeong Kwon) 한국기계가공학회 2014 한국기계가공학회지 Vol.13 No.3
Poly(g-glutamic acid) (g-PGA) is a very promising biodegradable polymer that is produced by microorganism of Bacillus subtilis. Because g-PGA is water-soluble, anionic, biodegradable, and even edible, its potential applications have been studied from an industrial standpoint. In this study, we fabricated porous g-PGA foams by means of a freeze-solvent extraction method for tissue-engineering applications. Porous g-PGA foams were chemically cross-linked using a hexamethylene diisocyanate solution. An aqueous basic solution was used to neutralize g-PGA foam for cell culturing. During an in vitro cell culture study, it was observed that primary rabbit ear chondrocytes were well at tached and spread over the surface oft hree-dimensional cross-linkedg-PGA foam. From these results, it is concluded that cross-linkedg-PGA foam is aprom is in gmaterial for tissue-engineering applications, especially those pertaining to the regeneration of human cartilage.
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김영은(Young Eun Kim),전현애(Hyeon Ae Jeon),이용택(Yongtaek Lee),윤여일(Yeo Il Yoon) 한국에너지기후변화학회 2008 에너지기후변화학회지 Vol.3 No.2
In this study, we suggested an aqueous promoted K₂CO₃ solution as an alternative of MEA solution, an absorbent of CO₂, Although the aqueous K₂CO₃ solution has cheap, low side reaction and regeneration energy, it has several disadvantages such as slow CO₂ absorption rate, low CO₂ absorption capacity and crystalline formation in comparison with MEA(30 wt%) solution. To improve these disadvantage of the K₂CO₃ aqueous solution, cyclic amine compound, piperazine(PZ), was added into the solvent to make better abilities. CSTR reactor was used to find vapor-liquid-equilibrium and CO₂ absorption rate in the solution at 40, 60, and 80℃, respectively, which was the temperature condition of the flue gases. The batch packed bed column was used to measure absorption capacity and examine the effects of concentration and L/G factors. We found that the K₂CO₃(15 wt%)/PZ(10 wt%) aqueous solution, that there is not a KHCO₃ crystalline at this mixing composition, has a similar equilibrium partial pressure with MEA and its CO₂ absorption rate is slower than MEA solution. But, it takes time for the mixed solution to come to equilibrium three times faster than the aqueous K₂CO₃ solution.
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한국어 단어 재인 시 선행 어절의 의미적‧통사적 정보가 미치는 영향
남기춘(Nam, Ki-chun),이은하(Lee, Eun-ha),전현애(Jeon, Hyeon-ae),이선영(Lee, Sun-young),김영주(Kim, Young-joo) 국어국문학회 2018 국어국문학 Vol.0 No.184
본 연구는 한국어 모어 화자가 서로 인접한 어절과 단어로 이뤄진 단일 구를 처리할 때 선행어절의 의미적‧통사적 맥락이 후행단어의 재인에 영향을 미치는지 그리고 의미적‧통사적 정보는 각기 어떤 순서로 처리되는지를 고찰했다. 이를 위해 형용사 어간과 어미 ‘-ㄴ/은’이 결합된 어절을 점화로 그리고 일반명사 단어를 표적으로 하는 점화 어휘판단 과제를 사용했다. 연구결과에 따르면, 점화어절과 표적단어가 의미적‧통사적으로 호응하는 조건은 의미적으로 상통하지 않지만 통사적으로는 호응하는 조건이나 의미적‧통사적으로 모두 상통하지 않는 조건보다 빠른 반응시간을 나타냈다. 아울러 의미적으로 상통하지 않지만 통사적으로는 호응하는 조건에서 의미적‧통사적으로 모두 상통하지 않는 조건보다 표적단어가 더 빨리 처리되는 양상을 보였다. 이는 형용사 어절과 명사로 이루어진 명사구 내에서도 의미적 점화가 일어나며, 점화어절의 의미적 정보를 바탕으로 어휘적 후보를 활성화할 수 없는 환경에서도 통사적 정보가 후속단어 처리에 독자적 영향력을 발휘함을 시사한다. The present study aims at investigating how syntactic and semantic context constraints affect word recognition in Korean. Participants performed a primed lexical decision task where a target noun was preceded by a semantically and syntactically congruent adjective eogeol, a syntactically congruent but semantically incongruent adjective eojeol, or a semantically and syntactically incongruent adjective eojeol. The results revealed that the syntactically and semantically congruent context reduced significantly reaction time for the subsequent target noun compared with the syntactically congruent but semantically incongruent context. More importantly, the syntactically congruent but semantically incongruent condition produced faster response times than semantically and syntactically incongruent condition. These findings provide supportive evidences for the possibility of both semantic and syntactic priming effects in a minimal phrase structure and the assumption of the serial model claiming that syntactic information may be processed earlier than semantic information.
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