The synthetic behaviors of carbon nanotubes (CNTs) by Fe/MgO catalysts were investigated in 0~90 wt.% range of MgO mixture ratios by catalytic chemical vapor deposition (CCVD) process. The CNTs were synthesized with 40 minutes of synthetic time, and 923 K of synthetic temperature using 0.1 L/min of ethylene gas and 1.0 L/min of hydrogen gas as synthetic and carrier gas, respectively. As the increase of synthetic temperatures and times, the diameters of CNTs become thicker. The carbon yield showed in a parabolic curve as MgO content increased and the maximum carbon yield was obtained at 30 wt.% of MgO. There were no obvious changes in the diameters of CNTs respect to the change of MgO content. Fe/MgO CNTs showed good crystalinity by High Resolution Transmission Electron microscope (HR-TEM) analysis. The behaviors of Fe/MgO CNTs have a tendency of depending on synthetic time and temperature rather than MgO content.

The effect of compositions of Al2O3 in the mixed Fe/Al2O3 catalysts on the synthetic behaviors of carbon nanotubes (CNTs) by catalytic chemical vapor deposition (CCVD) process was investigated in wide range of the mixture ratios of support materials. CNTs were synthesized with Fe/Al2O3 catalysis under the condition of 40 min in synthetic time, and 923 K of synthetic temperature using C2H4 and H2 as synthetic and carrier gas, respectively. The carbon yield with the content of Al2O3 showed in a parabolic curve and the maximum carbon yield was 40 wt.% of Al2O3. As the mixture ratio of Al2O3 increased, decreasing tendency was observed in the diameter of CNTs. Specific surface areas of CNTs were increased with the increase of the mixture ratio of Al2O3.

본 연구는 원양선박에서 발생하는 선원들의 질환을 원격의료시스템을 통해 실태를 파악하고, 이에 대한 진단명 및 질병분류의 분석을 통해 원양선박 선원들의 질병예방과 건강증진에 기여하는데 그 목적이 있다. 2016하반기부터 2017년까지 약 14개월 동안 원격 진 료를 통해 수집된 총 195명의 선원들의 진단명, 개인적, 건강적 특성을 수집하여 양적분석을 하였다. 질환발생 빈도에서 두드러기(5.6%), 요부염좌(4.1%), 급성위장관염(3.1%) 및 불안(3.1%) 등이 가장 흔하게 발생되는 상병으로 분석되었다. 질병분류에서는 근골격계(25.1%), 피부계(17.9%), 소화기계(11.3%) 순으로 나타났다. 원격의료의 발생은 30세미만이 가장 많았으며, 사관 보다는 부원의 질병발생이 많았다. 교차분석(Ⅹ² 검정)에서 질병이 외상보다 통계학적으로 유의하게 발생이 많았으며(p<.001), 선박의 종류(상선과 어선)에 따른 병인 간에도 차이가 있었다(p<.005).