신경내분비종양은 드물지만 완전 절제가 필요한 종양으로 십이지장 주유두에 발생한 경우 췌십이지장절제술이 권고되어 왔다. 하지만 수술에 따른 위험도를 고려할 때, 분화도가 좋고 전이가 없으며 췌관이나 담관에 침범이 없는 선택된 경우에 한해서 내시경절제술이 시도되고 있다. 이번 증례는 내시경 유두절제술을 통하여 신경내분비종양을 완전히 절제하는데 성공한 증례로 십이지장 주유두 신경내분비종양에 있어서 수술에 대한 위험도가 높을 경우 내시경절제술이 대안이 될 수 있음을 보여주었다.

The electrochemical performances of an asymmetric hybrid capacitor were investigated using LiFePO4 as the positive electrode and active carbon fibers(ACF) as the negative electrode. The electrochemical behaviors of a nonaqueous hybrid capacitor were characterized by constant current charge/discharge test. The specific capacitance using LiFePO4/ACF electrode turned out to be 0.87F/cm2 and the unit cell showed excellent cycling performance. This hybrid capacitor was able to deliver a specific energy as high as 178 Wh/kg at a specific power of 1,068 W/kg.

The electrochemical characteristics of electric double layer capacitor(EDLC) were investigated using various carbon materials. The physical properties such as specific surface area and mean pore size of activated carbon were analyzed by BET. The results of the activated carbon used for electrode material showed that the specific surface areas varied from 600 to 1500 m2/g and mean pore sizes from 1.74 to 2.88 nm. A maximum specific capacitance of 0.30 F/cm2 was obtained for the activated carbon with the highest specific surface area and ionic conductivity. Also, it was found that the electrochemical results of the cyclic charge-discharge tests were stable.