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김원석,이종욱 대한기계학회 2014 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.28 No.7
Gas side corrosion affects all heat recovery steam generators (HRSGs). Consequences range from unsightliness and reduced performanceto reliability problems and potential safety hazards. The enamel coating used for the HRSG fin tubes was visually and microscopicallyinspected, analyzed and compared with original one. From the results of the analysis, there was not much different between thecoating and the original in the comparison of the strength, SEM (scanning electron microscope), and thermal expansion. For the overallheat transfer due to the coating, it was found that the coating fin tubes have about 2% degradation in comparison with the original ones. However, the use of enamel coating can help strongly to delay the corrosion problem by flue gases in the HRSG.
노인장기요양보험 수발등급 평가에 있어 노쇠지수 및 수정바델지수의 유용성
김원석,신형익 대한노인병학회 2008 Annals of geriatric medicine and research Vol.12 No.4
Background: There are no additional objective tools to double-check the care grades and to assess a subject's m edical status except a statem ent of the doctor's view in the assessm ent of care grades in geriatric long-term care service. Thus, w e designed this study to investigate w hether the frailty index (FI) and the K orean version of the m odified Barthel index (K-M BI) can be useful com plem entary assessm ent tools in the assessm ent of care grades in geriatric long-term care service. M ethods: Data for calculating care approved tim e, FI, and K-M BI were obtained from the interview of 114 hom eresidents (elderly >65 years of age) in S ungnam city by educated investigators. Results: There was a significant positive correlation between FI and care grade (Spearm an correlation coefficient = 0.547, p<0.001). A significant negative correlation between K-M BI and care grade (Spearm an correlation coefficient =-0.811, p<0.001) w as dem onstrated. The difference betw een the scores on the FI and K -M B I w as significant betw een the care grades (p<0.001). Conclusion: The FI and K-M BI had a good correlation with care approved tim e in geriatric long-term care service and were significantly different between the care grades. FI and K-M BI can be useful com plem entary assessm ent tools in the assessm ent of care grades in geriatric long-term care service.