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Chemical composition characteristics of Korean straight ginseng products
홍희도 한국식품연구원 2014 Journal of Ethnic Foods Vol.1 No.1
Background The present study was conducted to provide basic data for standard quality characteristics by grade, and for the establishment of new grading criteria for Korean straight ginseng (SG). Methods The major constituents (moisture, total sugar, acidic polysaccharide, phenolic compound, crude saponin, and ginsenosides) in SG with skin products were analyzed to examine the standard quality characteristics. Results Five-year-old first-grade 15- and 25-piece grade SG products were collected over a period of 5 years and analyzed. The total water-soluble sugar content was 35.2% and 35.4% for the 15- and 25-piece grades, respectively, and the acidic polysaccharide content was 4.1% for the 15-piece grade and 4.6% for the 25-piece grade. Both the 15- and 25-piece grade products had 0.5% total phenolic compounds. The amount of crude saponin was 3.2–5.5% in all samples. The amounts of the major ginsenosides Rb1, Rf, and Rg1 were 4.7, 1.1, and 3.6 mg/g, respectively, in the 15-piece grade and 3.6, 1.0, and 3.0 mg/g, respectively, in the 25-piece grade. Conclusion Overall, the coefficient of variation was over 15% for the major constituent contents, indicating that it was difficult to standardize the constituent contents using the mean value.
홍희기(Hiki Hong),김시환(Sihwan Kim) 대한설비공학회 2009 대한설비공학회 학술발표대회논문집 Vol.2009 No.-
Ondol heating, a kind of radiant floor heating, is a main method used in housing units in Korea. Building energy simulation including ondol and relevant facilities has not been performed due to its complexity. For evaluating energy consumption and indoor temperature variation, a new method should be proposed. At the present work, a dynamic simulation on ondol heating was tried by combining TRNSYS and EES. Characteristic functions for a pump, hot water coils and a gas boiler were simutaneouly solved by EES, and calculated flow rates and supply temperature of hot water were provided as inputs of the active layer of TYPE 56 in TRNSYS. The results by the simulation on a typical housing unit in Korea shows a good trend in a viewpoint of actual behavior of ondol heating.
홍희기(Hiki Hong),김영균(Young Kyun Kim) 대한설비공학회 2011 대한설비공학회 학술발표대회논문집 Vol.2011 No.7
Low temperature ondol heating has a lot of advantages; efficiency increase of condensing boiler, COP increase of heat pump and collection efficiency in solar thermal heating. We showed the possibility to apply a real situation of an apartment housing by simulation. As a result, heating energy consumption during one week was the same though the supply hot water temperatures are changed, but the elaped time to a set room temperature becomes longer.