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전상일,이헌상 한국물리학회 2012 Current Applied Physics Vol.12 No.2
The electrical conductivity of amorphous polymer/multiwall carbon nanotube (MWCNT) composite films strongly depends on the Bernard-Marangoni (B-M) instability during solvent evaporation. We demonstrate that the films exhibit the lowest surface resistivity and the highest light transmittance near the onset point of B-M instability. The polymer/MWCNT composite films exhibit three-dimensional behavior in spite of the B-M instability. The percolation threshold for PC/MWCNT composite films at stable, onset,and unstable condition is 3.3 × 10-3, 2.75 × 10-3, and 5.15 × 10-3 vol.%, respectively.
폐플라스틱 재활용 방법의 경제성 분석 : 폐스티로폴 재활용을 중심으로
전상일,양봉민 한국환경정책학회 1997 環境政策 Vol.5 No.1
With the increasing use of EPS(expandable polystyrene, stroper), there has been troublesome in disposal of the waste styropor because the styropor hardly decays, takes up too much space for its weight, and prevent the soil structure from being stabilized when duried. In the meanwhile, the styropor was Chosen to be a separate collection item the bv the gorvernment since 1996 and the recycling process of the waste styropor was developed. In this paper we analyzed the economic propriety of a recycling method of the wastes styropor in Seoul through the coat-benefit analysis. The results are as follows. The" sum of benefits is larger than that of costs by 1~3times. But here, we have to consider that the value of the benefit side was underestimated because it's almost impossible to value the invisible benefits owing to the lack of resenable data while the sector was fully estimated. Putting all the results together, we can come to the conclusion that the recycling of the waste styropor has much value in view of social welfare. And we proposed several supplemental policies to promote the recycling works and to overcome market failure. Of all things, the governmental support is considered to be the most important in light of the disadvantages of the recycled products.