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인공 노화 종이에 전기방사된 폴리비닐알콜/셀룰로오스 트리아세테이트 섬유의 종이 보강 효과
정은수(Eunsue Jeong),신성철(Sungchul Shin),윤혜정(Hye Jung Youn),현진호(Jinho Hyun) 한국펄프·종이공학회 2018 펄프.종이技術 Vol.50 No.5
In this research, we tried to reinforce artificially aged paper by introducing polyvinyl alcohol (PVA)/cellulose triacetate (CTA) double layers through electrospinning. The electrospinning conditions of PVA and CTA were established, and the morphological features of the electrospun fibers were observed by scanning electron microscopy. The aged paper showed the decrease of tensile strength and the folding endurance, but the mechanical properties were effectively increased by the introduction of the electrospun layers. The electrospinning of polymers formed a stable and fibrous reinforcing layer at the paper surface without the use of liquid adhesives. It would be advantageous in the conservation protocol because it could minimize the inevitable deformation of paper in the drying process or contamination by the additive materials.
폴리비닐알콜/셀룰로오스 트리아세테이트 전기방사 섬유 이중층에 의한 종이 강도 보강
정은수(Eunsue Jeong),신성철(Sungchul Shin),이제곤(Jegon Lee),윤혜정(Hye Jung Youn),현진호(Jinho Hyun) 한국펄프·종이공학회 2018 펄프.종이技術 Vol.50 No.4
Polyvinyl alcohol (PVA) and cellulose triacetate (CTA) polymer solutions were electrospun to form nanofibers and microfibers, respectively. The bilayer of nano/micro fibers was prepared by electrospinning PVA nanofibers on the paper followed by electrospinning CTA microfibers on the top of a PVA nanofiber layer. The structure of electrospun fibers was observed by FE-SEM and mechanical properties of electrospun layers and bilayers were characterized to investigate split resistance, tensile index, folding endurance, and reversible preservability. The strength of damaged paper could be restored by applying the PVA nanofiber/CTA microfiber bilayer to paper and the nano/micro bilayer was easily detached by the exposure to moisture for a short period of time.
알지네이트를 이용한 셀룰로오스 하이드로겔의 투과 특성 제어
정은수(Eunsue Jeong),신성철(Sungchul Shin),박민성(Minsung Park),현진호(Jinho Hyun) 한국펄프·종이공학회 2015 펄프.종이기술 Vol.47 No.2
Natural cellulose hydrogel membrane cannot be directly used for cell encapsulation because it has many large pores on the surface that immune biomolecules are able to penetrate into easily. For the reason, alginate was used for the control of pore size of the cellulose hydrogel membrane. The surface morphology of cellulose/alginate nanocomposite confirmed the successful control of the porosity of the membrane. The permeability of the cellulose/alginate nanocomposite was decreased but mechanical properties were increased compared with the bacterial cellulose membrane. The cellulose/alginate nanocomposite could be used for the functional membrane as a promising biomedical material in the future.
최혜지(Choi, Hyeji),정은수(Jeong, Eunsu) 비판과 대안을 위한 사회복지학회 2018 비판사회정책 Vol.- No.60
안정적인 사회경제적 토대는 질적인 삶의 기초이다. 이 연구는 노동불안정성을 핵심적 정체성으로 공유하는 사회경제적 집단, 즉 프레카리아트化가 중고령 임금노동자의 정신건강과 어떤 연관성을 갖는지를 소외와 우울을 중심으로 밝히고자 한다. 사회조사 연구로 수행되었으며, 대면면접을 통해 수집한 50세 이상의 은퇴 전 중고령 임금노동자 437명의 자료를 SEM을 이용해 분석했다. 분석결과, 소득 불안정의 두지표인 저임금, 사적 및 공적보호체계의 부재, 숙련 불안정의 지표인 직업훈련이나 교육기회의 부재는 우울에 직접적으로 부정적인 영향을 미치는 것으로 나타났다. 또한 사적 및 공적보호체계의 부재는 소외를 매개로 우울을 높이는 것으로 분석되었다. 반면 고용 불안정의 두 지표인 고용상 지위, 주관적으로 인지한 고용 불안정은 소외와 우울에 의미 있는 영향을 미치지 못하는 것으로 나타났다. 끝으로 연구결과의 함의에 대해 논의했다. The presented study aimed to investigate the associations between being a precariate and mental health of wage laborers aged 50 and over. Data from 437 waged laborers were analyzed with SEM. The results showed that lower wage, exclusion from job training, working at service industry were significantly associated with higher level of depression. Also, rage from labor relationship mediated the impact of lower wage and isolation mediated the impact of exclusion from job training on depression. The implications from the findings were discussed.