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Some characteristics of energetic neutral atom storm on Oct 3, 2001
이대영,최정림,김희정 한국우주과학회 2007 Journal of Astronomy and Space Sciences Vol.24 No.2
Wehavestudiedenergeticneutral atom(ENA)disturbances during themagnetic stormmain phase that occurred on October 3, 2001, using the ENA data from the HENA in-strument onboard the IMAGE spacecraft. We nd that the main phase is characterizedby ve ENA enhancement events that occurred quasi-periodically. The repetitive ENAenhancements are most signicant in the highest energy (13822 keV) oxygen chan-nel and become less signicant for hydrogen and in lower energies. Also they areseparated by 1.2 to 1.7 hrs, which is well below an average period usually seen forother repetitive injection events.
이대영,정성훈,강병하,홍희기,Lee, D.-Y.,Jung, S.-H.,Kang, B.H.,Hong, H. 대한설비공학회 1999 설비공학 논문집 Vol.11 No.1
An experimental study on the performance enhancement of a screw-compressor-type chiller with 100kW of nominal cooling capacity has been carried out. Performance test facility was developed to investigate the effects of a partial modification from the existing chiller on the performance. By replacing the existing shell-and -tube heat exchangers with plate heat exchangers, the cooling capacity is increased by 15~18% and the COP is also increased by 19~21% depending on the operation temperature range. Charging mixed refrigerant R22/R142b(80 : 20) instead of R22 into the chiller with plate heat exchangers improves the cooling capacity by 4% and the COP very largely by 30%. Each contribution of the plate evaporator, plate condenser, and mixed refrigerant to the performance enhancement is examined by analyzing the refrigeration cycle and the heat transfer processes. It is also shown that the chiller performance can be improved by adapting 2-stage-compression cycle using an economizer.
이대영 한국비평문학회 2006 批評文學 Vol.- No.22
The Research of Otherness on the Kong, Sun Ock's Novel