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A Comparison of Compression Rates on the Quality of Cardiopulmonary Resuscitation
홍영훈,홍종근,이경렬,정한호,김정현,김용환,이준호,조광원,황성연 대한응급의학회 2013 大韓應急醫學會誌 Vol.24 No.2
Purpose: In cardiopulmonary resuscitation (CPR) there are different opinions on the compression rate that should be applied. The aim of this study was to compare the total number of adequate compressions delivered during a fiveminute period among four groups of lay persons (≥139min-1, 129-138, 114-128, and <114). Methods: This study represents a secondary data analysis from our previous research about the influence of age on fatigue during CPR. Participants were asked to perform chest compressions (without rescue breaths) at a rate of >100 times/minute and a depth of >5 cm for five minutes. A total of 86 participants were then divided into four groups based on their mean compression rate. Age, sex, and body mass index were analyzed as factors affecting the compression rates. Results: The group delivering a compression rate above 139 compressions min-1 performed better than those delivering below 114 compressions min-1 (p=0.03). There was no significant difference in the mean compression depth (p=0.13), percentage of incomplete chest recoil (p=0.277),or the percentage of incorrect hand positioning (p=0.091). All participants (except five) performed chest compressions at a rate above 100 compressions min-1. EDITOR: It may help to indicate whether age, sex, or body mass index (BMI)had an impact on compression rate. Conclusion: Our results suggest that a chest compression rate above 139 compressions min-1 does not deteriorate the quality of compressions compared to a lower chest compression rate (below 114 min-1) during a five-minute period. Most untrained lay people performed chest compressions well, within a range of 100~150 min-1.
홍영훈,김관용,김주호,손수현,이형호,어현동,김민석,홍석호,정진욱 한국원자력학회 2022 Nuclear Engineering and Technology Vol.54 No.10
For the first time, two-dimensional temporal behavior of the edge localized mode (ELM) filament is measured in the edge tokamak plasma with a multi-channel electrical probe array (MCEP). MCEP, which has 16 floating probes (4 4), is mounted at the far scrape-off layer (SOL) region in the KSTAR. An electron temperature and an ion flux are measured by sideband method (SBM), which can achieve twodimensional measurements with high time resolution. Furthermore, temporal evolutions of the electron temperature and the ion flux are obtained during the ELM occurrence. In the H-mode period, short spikes from ELM bursts are observed in measured plasma parameters, and the trend is similar to that of typical Ha signal. Interestingly, when blob-like ELM filaments crash the probe, the heat flux is significantly higher in a local region of the probe array. The results show that our probe array using the SBM can measure the ELM behavior and the plasma parameters without the effect of the stray current caused by the huge device. This study can provide valuable data needed to understand the interaction between the SOL plasma and the plasma facing components (PFCs).