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박정윤(Jung Yoon Park),박찬용(Chan Yong Park),정현석(Hyun Seok Jeong),이진희(Jin Hee Lee),김형진(Hyoung Jin Kim) 한국펄프·종이공학회 2016 펄프.종이技術 Vol.48 No.6
After the revision of management law regarding public records and with the establishment of presidential records management law in Korea, the scale and volume of record collection have increased. As the collected records tend to be diverse in nature, the preservation techniques used for the vital national archives have also been reviewed. In this study, the fibrous raw materials of paper used for long term storage of important national archives were investigated. The optimal digestion conditions of domestic white inner layer of paper mulberry and the physical properties of woody and non-woody fibers such as SwBKP, HwBKP, abaca, Samjidak and domestic paper mulberry fibers were examined for machine-made Hanji. Digestion conditions of domestic white inner layer of paper mulberry were efficient for active alkali dosage 10% for 60 minutes in terms of screened yield, brightness, degree of polymerization, and shive content. The physical fiber properties such as average fiber length, fiber length distribution, WRV (Water Retention Value) and chemical composition were evaluated to obtain optimum mixing ratios with domestic paper mulberry fibers. As a result, the mixing ratio of 80% domestic paper mulberry fibers and 20% SwBKP was found to be satisfactory in the mechanical and structural properties of machine-made sheet, in the stable supply and demand of fibrous raw materials, and in the lower cost of production.
박영옥 ( Young Ok Park ),강은희 ( Eun Hee Kang ),박소정 ( So Jung Park ),박민아 ( Min A Park ),윤소윤 ( So Yoon Yoon ),김승란 ( Seung Lan Kim ),박정윤 ( Jeong Yun Park ),정영선 ( Young Sun Jung ),홍석경 ( Suk Kyung Hong ),예병덕 ( 한국정맥경장영양학회 2009 한국정맥경장영양학회지 Vol.2 No.1
Purpose: High gastric residual volumes (GRVs) are known to be one of the frequent causes of stopping enteral nutrition. This study was performed to investigate the gastric residual volume status in critically ill patients who were admitted to intensive care units. Methods: The subjects were 96 critically ill patients who were admitted to the ICU at ASAN Medical Center between October 1, 2008 and March 31, 2009. The measured volumes were categorized in 50 ml intervals from 0 to 500 ml. Results: Of the total GRVs measured, 46% were <50ml. The patients with a GRV ≥50 ml were 54% and 4% had a GRV ≥250 ml, whereas none of the patients` GRVs were ≥500 ml. When admitted to the hospital, There was a correlation between the APACHE 2 score and the gastric residual volume. This shows that the higher the APACHE2 score was the gastric residual volume. And there was a correlation between the APACHE 2 score and the loss of calories. This shows that the higher the APACHE 2 score was the loss of calories. Conclusion: The gastric residual volume of the critically ill patients under enteral nutrition in our hospital was not higher than that presented on the guidelines from the US and Canada. In addition, there was a big difference in the gastric residual volume among the critically ill patients depending on their clinical characteristics. Strict criteria for the gastric residual volume could be a factor for inhibiting proactive enteral nutrition. (KJPEN 2009;2(1):24-29)
경질탄산칼슘의 pigmentizing을 위한 표면강도 증강제 탐색
박정윤(Jung Yoon Park),홍석준(Seok Jun Hong),정현석(Hyun Seok Jeong),김형진(Hyoung Jin Kim) 한국펄프·종이공학회 2018 펄프.종이技術 Vol.50 No.5
In the papermaking industry, several studies on greenhouse emission reduction have been subjected. Among the studies, filler loading is the widely used method to reduce greenhouse emission by reducing fiber raw material and drying energy. Especially, precipitated calcium carbonate (PCC), as a typical filler, can improve physical and optical properties of paper as well as reduce carbon dioxide by reusing carbon dioxide during its synthesis. However, excessive internal filler loading causes side effect such as weakening of paper strength. In this study, in order to overcome the problems caused by excessive internal filler loading, some of fillers were separately applied to surface of paper as the pigmentizing. The pigmentizing is the technology of adding fillers to surface sizing agent, and carried as same as existed surface sizing process. The pigmentizing technology can increase the filler content without losses of the paper strength, at the same time, improve the optical properties which is decreased after surface sizing process. So in this study, we applied PCC synthesized diverse size and shape to the pigmentizing technology and evaluated surface properties of paper. In addition, in order to overcome dust problem caused by detached filler from surface, several polymers were applied to surface sizing agent and surface strengthening effect was evaluated. As a result, rhombohedral type of PCC was suitable for the pigmentizing in term of surface strength and optical properties. Surface strengthening agents were applied to scalenohedral type of PCC, among them, cationic polyacrylamide and anionic polyacrylamide critically increased the surface strength of pigmentized paper, when the polymers added below the level of flocculation of filler. In case of poly(ethylene oxide), surface strength was increased at the addition amount of 1% on filler, and it did not affect the viscosity of surface sizing agent and the flocculation of filler.