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정원조,김지연,구윤모,Jeong, Won Jo,Kim, Ji Yeon,Gu, Yun Mo Korean Chemical Society 2000 Bulletin of the Korean Chemical Society Vol.21 No.1
High-performance liquid chromatography is suitable for getting thermodynamic information about solute-solvent interactions. We used a squalane impregnated $C_{18}$ phase as a presumably bulk-like stationary phase to secure a simple partition mechanism for solute retention in reversed phase liquid chromatographic system. We measured retention data of some selected solutes (benzene, toluene, ethylbenzene, propylbenzene, butylbenzene, phenol, benzylalcohol, phenethylalcohol, benzylacetone, acetophenone, benzonitrile, benzylcyanide) at 25, 30, 35, 40, 45, and 50 $^{\circ}C$ in 30/70, 40/60, 50/50, 60/40 and 70/30 (v/v%) acetonitrile/water eluents. The van't Hoff plots were nicely linear, thus we calculated dependable thermodynamic values such as enthalpies and entropies of solute transfer from the mobile phase to the stationary phase based on more than four retention measurements on different days (or weeks). We found that the cavity formation effect was the major factor in solute distribution between the mobile and stationary phases in the system studied here. Our data were com-pared with some relevant literature data.
Normal Polysomnographic Characteristics in Korean Children and Adolescents
권순학(Soon hak Kwon),구윤모(Yun mo Gu),이호원(Ho won Lee),서혜은(Hye eun Seo) 대한소아신경학회 2014 대한소아신경학회지 Vol.22 No.3
Purpose: The objective of this study was to describe polysomnographic charateristics in normal children and adolescents in Korea. Little is known regarding sleep architecture in Korean children. Methods: We conducted a prospective study and examined sleep architecture, respiratory parameters, arousals, and periodic limb movement index during sleep (PLMS) in healthy children and adolescents for 2 consecutive days. Results: The study population consisted of 29 subjects and 15 subjects (52%) were male. Ages ranged from 5-16 years, with a mean of 11.6±.7 years. The average total sleep time (TST) was 438±35.6 min, and the mean sleep efficiency was 90.9±17.7%. The distribution of sleep stages as percentage of TST was as follows: stage N1, 6.6±2.9%; stage N2, 54.2±5.8%; stage N3, 21.1±6.7%; and stage R, 18.1±5.4%. The wake after sleep onset (WASO) was 2.0±2.9% of TST. The total arousal index (TAI) was 7.6±2.2. The current study findings are similar to those of previous studies in Western countries except longer stage N2 sleep and higher WASO. Conclusion: This is the first report of normal polysomnography values in Korean children. In order to accurately diagnose sleep disorders, normative sleep reference values are essential and our findings will provide fundamental data for pediatric sleep research.