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사이트 사용자 만족도 및 사용의도에 영향을 미치는 요인에 관한 실증연구;바이오안전성포탈을 중심으로
송우용,황경연,Song, Woo-Yong,Hwang, Kyung-Yeon 한국벤처창업학회 2006 벤처창업연구 Vol.1 No.2
The purpose of this research is to examine the major determinants affecting the user's satisfaction and usage intention on Biosafety Portal Site. The development of the research model is based on the empirical studies on the web site. Five hypotheses are derived and tested using regression analysis. The results from regression analysis suggest that technology, content, design and navigation all contributed significantly to the user's satisfaction. In addition, user's satisfaction with portal had a very significant influence on the continuance intention.
원소분석과 전자현미경 이미지 분석에 의한 먹의 특성 탐구
송우용(Woo-Yong Song),신수정(Soo-Jeong Shin),남태광(Tae-Gwang Nam),김병로(Byung-Ro Kim) 한국펄프·종이공학회 2017 펄프.종이技術 Vol.49 No.2
To investigate ink stick, we introduced elementary analysis of ink stick particles and image analysis of ink stick water printed on Hanji by FE-SEM. With elementary analysis, collagen glue content appears to originate from nitrogen content in ink stick powder. Collagen glue contents were 25-37% of ink stick. By image analysis of FE-SEM image from ink stick water printed on Hanji, soot particles aggregated with the spheric shape of carbon fullerene. Average spheric particle size was 40-49 ㎚, and its average aggregate size was 194-225 ㎚.
국내산 및 수입산 Old Newsprint(ONP)의 원료 및 탈묵 특성 분석
송우용(Woo-Yong Song),윤상구(Sang-Gu Yoon),김문성(Moon-Sung Kim),박종문(Jong-Moon Park),신수정(Soo-Jeong Shin) 한국펄프·종이공학회 2016 펄프.종이技術 Vol.48 No.4
As the recovery of domestic ONP (old newsprint) has not been met the market demand, foreign ONP has been imported from Europe, North America and Asia. Deinked pulp from European ONP has higher paper strength and brightness than those of domestic, Asia, or North America. Deinked pulp from North America’s ONP has longest fiber length than those of any other countries, which appeared due to the high contents of thermomechanical pulp (TMP). In deinking process, the addition of European ONP would be helpful for making newspaper materials to increase strength and brightness.
간척지에 식재된 단벌기 순환림 후보 이태리포플러 4개 클론의 화학적 조성 및 연료 특성에 관한 연구
송우용(Woo-Yong Song),한심희(Sim-Hee Han),신수정(Soo-Jeong Shin) 한국펄프·종이공학회 2016 펄프.종이技術 Vol.48 No.6
For evaluation of short rotation coppice properties of Poplus euramericanana , 4 clones were cultivated at reclaimed land. Chemical composition, polysaccharide, and calorimetric values were measured. All clones of biomass was higher lignin content (24.4-38.4%) than those of growed in normal condition (17.7-23.7%). According to from analysis of hot-water soluble extractive, lignin and hot-water soluble extractive content of bark were higher than that of woody core since tannin content and low-molecular weight materials were existed in bark. There were no significant differences in chemical and polysaccharide composition between one-year and two-year cultivated.
셀룰로오스 분해 능력을 갖는 세균의 셀룰로오스 나노 섬유 현탁액 오염 방지를 위한 첨가제 탐색
송우용(Woo-Yong Song),박태현(Tae Hyeon Park),전소영(Soyoung Juhn),성현아(Hyun-A Seong),신수정(Soo-Jeong Shin) 한국펄프·종이공학회 2018 펄프.종이技術 Vol.50 No.4
To prevent cellulase-containing bacterial contamination in cellulose nanofibril suspension, addition of preservatives in suspension was investigated. Without preservatives, viscosity was drastically decreased 74.8% by S. xylosus and 78.1% by B. subtilis. With more than 1.2% of phenoxyethanol addition, there was no bacterial contamination with small viscosity decrease. With 1.2% of 1,2-hexanediol addition, there was bacterial contamination observed by microscopic obervation and viscosity decrease. With 1.6% of 1,2-hexanediol addition, there was small bacterial contamination but no viscosity decrease. In case of sodium azide addition, this was less effective as preservatives than phenoxyethanol or 1,2-hexanediol.
섬유 수분 보수력 측정을 통한 셀룰로오스 나노섬유의 피브릴화 특성 평가
송우용(Woo-Yong Song),정수빈(Su Bin Jeong),전소영(So Young Juhn),신수정(Soo-Jeong Shin) 한국펄프·종이공학회 2019 펄프.종이技術 Vol.51 No.1
When water retention value (WRV) method was applied in cellulose nanofibril characterization for fibrillation, there were problems from plugging or passing through filter by cellulose nanofibrils. To solve these problem, a two step WRV method was proposed. Pulp mats were formed with a commercial chemical pulp by 1st WRV process and cellulose nanofibril suspensions were run for 2nd WRV process. There was no plugging or passing problems with pulp mat formed with more than 1.0 of pulp (oven-dried basis). With different centrifugal force and times, optimum condition for 2nd WRV process was 6,000 G with 40 min with constant WRV values. Cellulose nanofbiril with more carboxymethyl group had higher WRV value than other from degree of substitution 0.2 to 0.4. Fibrillation characteristics of cellulose nanofibrils was also compared by TEM image analysis and reached similar result between WRV and TEM image analysis.
나노 입도 분석기를 사용한 셀룰로오스 나노섬유의 폭과 크기 측정
송우용(Woo-Yong Song),전소영(Soyoung Juhn),곽지혜(Ju Hye Gwak),신수정(Soo-Jeong Shin),성현아(Hyun-A Seong) 한국펄프·종이공학회 2019 펄프.종이技術 Vol.51 No.1
Applications of cellulose nanofibril are highly dependent on its dimension (length and width). Quick and easy methods for measuring cellulose nanofibril dimensions are critical in process quality control. A nanoparticle size analyzer (Dynamic laser scattering) was applied for cellulose nanofibril characterization and two distinct peak areas were observed as one was its width (2-50 nm) and another was its length (100-500 nm). The width and length of the nanofibril from the nanoparticle analyzer were lower than those of TEM image analysis but each samples showed a similar trend between nanoparticle analyzer and TEM image analysis. Thus, the dynamic laser scattering nanoparticle analysis is recommended as a quality control tool for cellulose nanofibril making process for estimation of its length and width.
송우용(Woo-Yong Song),전소영(Soyoung Juhn),신수정(Soo-Jeong Shin) 한국펄프·종이공학회 2018 펄프.종이技術 Vol.50 No.5
Cellulose nanofibrils produced after quaternary amine pretreatment were investigated as basic characteristics of CNF with nanoparticle size, viscosity, and rheological properties. With DS 0.1 (C-CNF1), width of cellulose nanofibril was 8.1-14.1 nm compared with width of 3.9-9.5 nm with DS 0.3 (C-CNF2), which had narrower width distribution than carboxymethyl pretreated cellulose nanofibril (DS 0.3, width range: 3.1-20.6 nm). There was no significant difference in length of CNF regardless of pretreatment method or different degree of substitution. In viscosity, carboxymethylated CNF had higher than quaternary amine treated CNF due to different affinity to aqueous medium with different functional group. Quaternary aminated CNF had gel-like structure but there was no expulsion of water (syneresis), which syneresis is the characteristics of carboxymethylated CNF.
옥수수대 및 대나무 섬유로부터 제조된 셀룰로오스 나노피브릴의 특성
송우용(Woo-Yong Song),신수정(Soo-Jeong Shin),전소영(Soyoung Juhn) 한국펄프·종이공학회 2017 펄프.종이기술 Vol.49 No.2
Corn stalk and bamboo were used for raw materials for cellulose nanofibril by pulping followed by bleaching to compared with hardwood raw material. Corn pulp was produced by soda pulping process but bamboo pulp was made by soda-anthraquinone pulping process. Pulp yield was lower in bamboo (32.7%) compared with corn stalk (37.2%). Lower yield of bamboo pulp resulted in higher lignin content than hardwood, and more xylan removal in alkaline pulping. Lower yield of corn stalk come from higher hot-water extractives content than hardwood. Cellulose nanofibril (CNF) was made by bleached pulp with carboxymethylation pretreatment. Average width of CNF was 4.8 ㎚ for CNF from yellow poplar pulp, and 6.1 ㎚ from that of bamboo, but 16.5 nm for corn stalk pulp. Water-holding ability quite similar between bamboo CNF and yellow poplar CNF but quite lower for corn stalk CNF.