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우리나라 종관기후 연구에 자기조직화지도 기법의 적용가능성 연구
전상희,최영은 건국대학교 기후연구소 2013 기후연구 Vol.8 No.1
This study aimed to examine the applicability of Self-organizing Map(SOM) method for synoptic climatology studies over the Republic of Korea through a case study on classification of winter atmospheric pressure patterns. When SOM was conducted using spatial range 10~70°N, 80~180°E, 4x3 map size, linear initialization, batch training algorithm and neighborhood function ep(Epanechnikov function) for the case study, classified atmospheric pressure patterns showed the best result. The classified atmospheric patterns were similar to surface weather charts of Korea Meteorological Administration(KMA). Also all input vectors were classified into one atmospheric pressure pattern(node) so it is possible to analyse time series and characteristics of climatic elements according to atmospheric pressure patterns. Therefore, SOM method might be appropriate for the studies on synoptic climatology over the Republic of Korea.
전상희,김호동,Chun, Sang-Hee,Kim, Ho-Dong 한국섬유공학회 2009 한국섬유공학회지 Vol.46 No.5
The effect of fiber content and fiber length on the tensile and flexural strength of basalt chopped fiber reinforced cement composite was investigated. The tensile and flexural strength of the cement composites were effectively improved by the addition of basalt chopped fiber. The cement composite reinforced with shorter fiber length showed the higher tensile strength. On the contrary, the flexural strength was increased with the increase of fiber length. Also basalt chopped fiber in saturated $Ca(OH)_2$ solution which is similar to the alkaline environment of cement hydration exhibited very low weight loss and high stability even after 3 months of immersion.
전상희,최영욱,김민수 대한설비공학회 2016 International Journal of Air-Conditioning and Refr Vol.24 No.3
This paper presents the review on the boil-off gas re-liquefaction system of liquefied CO2 transport ship for carbon capture and sequestration (CCS). It is assumed that liquefied CO2 is transported between South Korea and Middle East for enhanced oil recovery (EOR) and enhanced gas recovery (EGR), which is similar to the oil and LNG transportation route. The concept of open re-liquefaction cycle which means that the boil-off CO2 is compressed, cooled, and expanded before being piped back into the tank is suggested. The effects of impurities on the re-liquefaction cycle is investigated under the condition of fixed cooling capacity in terms of cycle performance and reliability. Specifications of LCO2 transport ship about storage tank and re-liquefaction system is reviewed. In addition, economic feasibility is investigated. As for the case of the present study, negative effects of impurities on the cycle performance and reliability should be considered due to its considerable effects. Conservatively calculated internal rate of return (IRR) of the re-liquefaction system shows 4.1%, therefore, it can be guessed that the BOG re-liquefaction system will have economic validity in the future CCS chain.