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조해민,이지영,김수호,이연희 한국공업화학회 2020 한국공업화학회 연구논문 초록집 Vol.2020 No.-
본 연구에서는 크라프트 펄프화를 통해 제조된 과수부산물 펄프의 표백의 표백 적성을 평가하였다. 표백은 이산화염소 3단 표백을 진행하였고 단계별 이산화염소 투입량을 달리하여 과수부산물 표백 펄프를 제조하였다. 과수부산물 표백 크라프트 펄프의 백색도와 CED 점도를 측정하여 섬유의 DP(degree of polymerization)의 손상이 최소화되고 백색도가 가장 높은 최적 표백 조건을 선정하였고 최적 조건으로 3단 표백처리된 과수부산물 표백 크라프트 펄프와 활엽수 크라프트펄프의 특성을 비교하였다. ** 이 논문은 농림축산식품부의 재원으로 농림식품기술기획평가원의 농생명산업 기술개발사업의 지원을 받아 수행된 연구임(118040-3).
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조해민,류중렬,심충식,홍석우 한국융합보안학회 2023 융합보안 논문지 Vol.23 No.5
최근 화두가 되고있는 MZ세대가 사회적으로 다양한 역할을 수행하는 주요 세대로 접어듦에 따라, MZ세대의 눈높이에 맞춘 효율적인 교육 방법과 컨텐츠 제작에 대한 연구 필요성이 지속 제기되고 있다. 본 논문은 이러한 현실 속에서 보안 교육용 컨텐츠에 대한 수준 제고와 발전 방향에 대한 논의를 위해 서술되었다. 이를 위해 현재 사회적으로 활용되고 있는 보안 교육 컨텐츠에 대한 효용성을 분석하고, 발전방안으로서 웹툰에 게이미피케이션 개념을 접목한 게임툰이라는 컨텐츠를 설명, 교육 효과에 대해 리커트 척도를 통해 검증하였다. 나아가 보안 교육 컨텐츠에 적용 가능한 발전 방향도 함께 제시하여 효과적으로 활용할 수 있도록 제안하였다. As the MZ generation, which has recently become a hot topic, enters a major generation that plays various social roles, the need for research on efficient educational methods and content production tailored to the level of the MZ generation continues to be raised. In this reality, this paper was described to discuss the direction of development and raising the level of security educational content. To this end, the effectiveness of security educational content currently being used socially was analyzed, the content of a gametoon that combines the concept of gamification with a webtoon as a development plan was explained, and the educational effect was verified through the Likert scale. Furthermore, it was proposed to effectively utilize it by presenting the direction of development applicable to security educational contents.
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조해민,이지영,김수호,이연희 한국공업화학회 2020 한국공업화학회 연구논문 초록집 Vol.2020 No.-
본 연구에서는 제지산업의 지속적인 성장과 낮은 펄프자급율을 극복하기 위해 과수농장에서 발생하는 과수부산물을 이용하여 크라프트 펄프를 제조하고자 하였다. 이를 위해 감나무 가지치기 부산물을 수집한 뒤 액비와 활성 알칼리도에 따라 실험실용 다이제스터에서의 반응시간을 달리하여 최적 수율을 찾을 수 있는 크라프트 펄핑 조건을 도출하였고, 기존의 활엽수 크라프트 펄프와 비교하기 위하여 펄프섬유의 주요 물성을 분석하였다. ** 이 논문은 농림축산식품부의 재원으로 농림식품기술기획평가원의 농생명산업 기술개발사업의 지원을 받아 수행된 연구임(118040-3).
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셀룰로오스 나노피브릴의 종류에 따른 특수지의 강도와 탈수성 평가
조해민,이지영,김수호,이연희 한국공업화학회 2020 한국공업화학회 연구논문 초록집 Vol.2020 No.-
본 연구에서는 다양한 전처리 방법으로 제조된 셀룰로오스 나노피브릴(cellulose nanofibril; CNF)로 면펄프에 내첨하여 실험실적으로 특수지를 제조하고 주요 강도인 인장강도와 내절도 및 지료의 탈수성을 평가하였다. 이 때 기계적 처리만으로 제조된 CNF, 효소 전처리와 기계적 처리로 제조된 CNF, 카르복시메틸화 전처리와 기계적 처리로 제조된 CNF를 사용하였다. CNF 종류별, 투입량별로 제조된 특수지의 물성을 평가하여 탈수성을 고려한 조건에 가장 높은 강도를 나타내는 CNF를 도출하고자 하였다. ** 이 논문은 2016년도 산업통상자원부 및 산업기술평가 관리원 (KEIT) 산업기술혁신산업(글로벌전문기술개발사업(섬유생활스트림))의 지원에 의한 연구임(과제번호 10067241).
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셀룰로오스 나노섬유 제조용 국산 테일러 유동 나노분쇄기 개발 I - 파일럿 테일러 유동 나노분쇄기 성능 평가를 위한 효소 전처리 셀룰로오스 나노섬유의 제조 및 물성 평가 -
조해민,김도훈,이수현,이지영,박노성 한국펄프·종이공학회 2022 펄프.종이기술 Vol.54 No.5
In this study, we attempted to manufacture a pilot scale Taylor-flow nanogrinder (pilot nanogrinder) and evaluated its grinding efficiency by analyzing the characteristics of cellulose nanofiber (CNF). To prepare an enzyme-pretreated CNF (EN-CNF), softwood bleached kraft pulp (SwBKP) was grounded using the pilot nanogrinder after being pretreated with 1.0% of an endo-glucanase. EN-CNF was also prepared with the same pretreated SwBKP using an imported microgrinder as a control. Finally, their particle size, viscosity, and fiber width were determined. The enzyme effectively reduced the fiber length of SwBKP for producing EN-CNF using grinders due to the removal of amorphous regions and microfibrils from SwBKP. As the grinding time of the pilot nanogrinder increased, the particle size and fiber width of ENCNF decreased and the viscosity of EN-CNF increased. The imported grinder showed the same trends.Based on the fiber width of the EN-CNFs, the grinding efficiency of the pilot nanogrinder was 98% that of the imported microgrinder and improved significantly compared to the previous study. However, the pilot nanogrinder required more grinding time than the imported microgrinder for manufacturing the CNFs of similar size. Therefore, although the pilot grinder effectively produced CNF, it was also necessary to develop a technology that could accelerate the grinding process. .
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셀룰로오스 나노섬유 제조용 국산 테일러 유동 나노분쇄기 개발 II - 펄프 수종에 따른 카르복시메틸화 셀룰로오스 나노섬유의 물성 평가 -
조해민,이수현,이지영,박노성 한국펄프·종이공학회 2022 펄프.종이기술 Vol.54 No.6
In this study, we investigated the characteristics of carboxymethylated cellulose nanofibers (CM-CNFs) using a pilot scale Taylor-flow nanogrinder (pilot nanogrinder). Two types of CM-CNFs made from softwood bleached kraft pulp (SwBKP) and hardwood BKP (HwBKP) were prepared using the pilot nanogrinder via carboxymethylation. The CM-CNF samples were taken every hour in a six-hour grinding process, and then their particle size, fiber width, and low-shear viscosity were analyzed. The fiber length, fiber width, fines content, and morphology of the carboxymethlyated SwBKP and HwBKP were not significantly changed, but their crystallinity was somewhat reduced after carboxymethylation. With increasing grinding time for carboxymethylated BKPs, the fiber width of CM-CNFs decreased linearly. However, the particle-size analysis results were not reasonable compared to the references, which indicated that the laser diffraction method was inefficient for particle-size determination for the transparent CM-CNFs. The low-shear viscosity of CM-CNFs increased linearly with the grinding time. The CM-CNF made from SwBKP showed lower fiber width and higher low-shear viscosity than that made from HwBKP. Therefore, it was concluded that CM-CNFs made from BKPs could be manufactured using the pilot scale Taylor-flow nanogrinder, and SwBKP was more effective to produce CM-CNF with lower fiber width and higher viscosity than HwBKP. .
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셀룰로오스 나노섬유 제조용 국산 테일러 유동 나노분쇄기 개발 III - 스케일업 테일러 유동 나노분쇄기로 제조된 셀룰로오스 나노섬유의 물성 평가-
조해민,이수현,이지영,박노성 한국펄프·종이공학회 2023 펄프.종이기술 Vol.55 No.5
In this study, we attempted to manufacture a scale-up Taylor-flow nanogrinder by compensating the shortcomings of a pilot scale Taylor-flow nanogrinder derived from previous studies. Two types of cellulose nanofibers (CNFs) were prepared depending on the pretreatment using a scale-up Taylor-flow nanogrinder and their characteristics were measured to evaluate the grinding efficiency. The capacity of the grinder cylinder and the mixer increased respectively while increasing the capacity of a scale-up Taylor-flow nanogrinder. The size of the diamond particles electrodeposited on the surface of the stator and rotor, which were the components of the grinder cylinder, and the gap between the stator and rotor were reduced to improve the grinding efficiency. In addition, a multi-stage centrifugal pump was installed to induce a uniform flow of CNF slurry according to the increased grinder capacity. When RE-CNF (refining CNF) was manufactured from refined hardwood bleached kraft pulp (HwBKP) using a scale-up Taylor flow nanogrinder, the average particle size and fiber width decreased and the low shear viscosity decreased as the grinding time increased due to HwBKP fibrillation. However, considering the fiber width's average value and standard deviation, it was concluded that the refining pretreatment was not adequate for this facility. When EN-CNF (enzyme-pretreated CNF) was manufactured from enzyme-pretreated HwBKP using a scale-up Taylor flow nanogrinder, the particle size and fiber width decreased linearly as the enzyme dosage and the grinding time increased simultaneously. In particular, when the grinding was carried out for 5-6 h, the fiber width of EN-CNF decreased to 50 nm or less, and the standard deviation decreased. This meant that enzyme pretreatment was efficient for the manufacture of CNF using a scale-up Taylor-flow nanogrinder. Nevertheless, the optimum enzyme dosage and the grinding time should be confirmed carefully to acquire the desired qualities of EN-CNF.
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