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( Jae-jun Shim ),( In Hwan Oh ),( Sang Bae Kim ),( Jung Wook Kim ),( Chang Kyun Lee ),( Jae Young Jang ),( Ju-seog Lee ),( Byung-ho Kim ) 대한소화기학회 2016 Gut and Liver Vol.10 No.6
Background/Aims: The benefit of oral antiviral therapy in preventing hepatocellular carcinoma (HCC) in the general population is not well understood. We used a novel prediction method to estimate the risk of HCC in the Korean population based on various treatment guidelines. Methods: The 5-year risk of HCC following antiviral therapy was calculated using an HCC risk prediction model. A virtual cohort that represented Koreans (>40 years old) with chronic hepatitis B virus (HBV) infection was established using the fifth National Health and Nutrition Examination Survey. The antiviral indications tested were the Korean National Health Insurance (NHI) and European Association for the Study of the Liver (EASL) guidelines as well as a new extended indication (serum HBV DNA >2,000 IU/mL regardless of serum aminotransferase level). Results: A total of 993,872 subjects were infected with HBV in the general Korean population. Over a 5-year period, 2,725 HCC cases were predicted per 100,000 persons (0.55%/yr). When the cohort was treated based on the Korean NHI, the EASL, and the newly extended indications, HCC risks decreased to 2,531 (-7.1%), 2,089 (-23.3%), and 1,122 (-58.8%) cases per 100,000 persons, respectively (p<0.0001). Conclusions: Simulated risk prediction suggests that extending of oral antiviral indication may reduce the HCC risk in the general population. (Gut Liver 2016;10:962-968)
Effect of pH on phase separation of globular protein
Sang Gon Kim,Jae-Jun Kim,Young Chan Bae 한국화학공학회 2009 Korean Journal of Chemical Engineering Vol.26 No.3
A molecular-thermodynamic framework is proposed to describe protein precipitation by inorganic salt. The equation of state consists of a hard-sphere reference contribution and a perturbation term. The reference term is derived based on the modified Chiew's model to describe the pre-aggregation effect of protein at various solution pH. In this study, we discuss protein-protein effective two-body potentials. The distribution and magnitude of charges on the surface of a protein vary significantly with pH. It changes the magnitude of charge-charge repulsion, charge-dipole attraction, dipole-dipole attraction, and induced dipole-induced dipole attraction forces between protein pairs in solution. The distribution of the charge fluctuation is slightly effective in solution pH. To investigate the effect of pH, modified charge fluctuation distribution model is proposed. Using the proposed model, we successfully describe the pH dependence of the protein precipitation.
( Sang-u Bae ),( Young-rok Seo ),( Jae-gyoung Gwon ),( Sun-young Lee ),( Birm-june Kim ) 한국목재공학회 2019 한국목재공학회 학술발표논문집 Vol.2019 No.1
The effects of accelerated weathering on the visual appearance, chemical changes, and water absorption properties of waste WPC/virgin WPC blends-based composites were investigated. The visual appearance of the weathered surface of composites was observed through colorimeter and visual photos. Also, FT-IR was employed for analysis the changes in chemical composition. The trends of water absorption and thickness swelling of the composite specimens were measured as well. This study showed that as the UV exposure time for weathering was getting longer, the color fading of the surface, carbonyl concentrations, water uptake, and thickness swelling rate were increased in all specimens. In particular, the higher the virgin WPC content, the higher the color change, carbonyl concentration, and absorption rate. Moreover, in this study, we investigated how the degradation behaviour of virgin WPC and waste WPC correlate with chemical and color changes by accelerated weathering. Besides, during the weathering test, wood lignin was photo-oxidized and deteriorated, resulting in a considerable color fading in the WPC surface.
< 전시-P-45 > Accelerated Weathering of Virgin WPC/Waste WPC: Mechanical and Morphological Properties
( Sang-u Bae ),( Young-rok Seo ),( Jae-gyoung Gwon ),( Sun-young Lee ),( Birm-june Kim ) 한국목재공학회 2019 한국목재공학회 학술발표논문집 Vol.2019 No.1
Wood-plastic composites (WPCs) have attracted much attention in recent decades due to their competitive cost, great processability and excellent physical performance. Also, some of their main applications are represented by outdoor decking and furnishing. Since they are mainly applied to outdoor places, it is very important to evaluate the degradation behavior of WPCs under UV irradiation and moisture exposure, which are the major natural weathering factors. The chief aim of this research is to recycle waste-WPC(W-WPC) collected after use. However, such a W-WPC is inevitably deteriorated properties. In order to overcome these problems, virgin-WPC(V-WPC) was prepared with the same recipe as that of the original WPC. Five different blends were designed with different proportions of W-WPC and V-WPC. Each of the blends was prepared using extrusion and injection moulding, and then it was subjected to analyze various characterizations. The evaluation of weathering behavior by accelerated artificial weathering was carried out according to ASTM D2565 and total 1000 hours of exposure time was applied to test specimens using the Weather-O-Meter(WOM) equipment. Tensile, flexural properties, and impact strength of the specimens were tested at each 250, 500, and 1000 hours after accelerated weathering. The morphology of the weathered surface was observed by scanning electron microscope(SEM). From this study, a certain corelation between mechanical and morphological properties that occurred during accelerated weathering of W-WPC/V-WPC blends were established.