http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
A comparative electrical transport study on Cu/n-type InP Schottky diode measured at 300 and 100 K
김호경,Chan Yeong Jung,Se Hyun Kim,Yunae Cho,김동욱 한국물리학회 2016 Current Applied Physics Vol.16 No.1
Two oxygen plasma treated InP samples with different plasma powers of 100 and 250 W were prepared and a comparative study on the electrical properties of Cu/n-type InP Schottky diode measured at 300 and 100 K was performed to investigate the current transport mechanism in detail. The forward and reverse bias currentevoltage (IeV) characteristics were analyzed with considering various transport models. The fitting to the forward bias IeV characteristics revealed that relatively high ideality factor at 300 K for untreated sample were related with the generation-recombination (GR) current and the large E00 value at 100 K for 100 W plasma treated sample were associated with more significant tunneling effect. The analyses on the reverse bias current characteristics showed the suitable current transport model has changed from thermionic emission (TE) to TE combined with barrier lowering for both untreated and 250 W treated samples and from TE þ BL to thermionic field emission for 100 W treated sample with increasing temperature from 100 to 300 K.
김호경 대한흉부심장혈관외과학회 1994 Journal of Chest Surgery (J Chest Surg) Vol.27 No.1
Between January 1990 and June 1993, the retrospective analysis was done in 48 consecutive patients with hemoptysis. According to clinical condition of patients, managements were divided into 3 subgroups; group 1[percutaneous bronchial artery embolization, group 2[operation after percutaneous bronchial artery embolization],group 3[delayed and emergency operation]. It was characterized that recurrence of hemoptysis was very frequent and most frequent underlying cause was pulmonary tuberculosis. In 40 patients[83%] urgent examination with flexible broncoscope was done and localization of the bleeding source was possible only in 24[60%] patients. The amount of hemoptysis was variable but there are no difference between groups and 22 patients[45%] had a prior episode of hemoptysis usually within 3 months of their admission. The recurrence was limited only in group 1[3/22] and the mortality rate was 6%[3/48]. We suggest that percutaneus bronchial artery embolization may be effective in recurrent massive hemoptysis but definitive management was operation.
다축응력상태에서의 304 스테인리스강의 고온 파괴수명에 관한 연구
김호경,정강,정진성,Kim, Ho-Kyung,Chung, Kang,Chung, Chin-Sung 대한기계학회 1998 大韓機械學會論文集A Vol.22 No.3
Specimens of 304 stainless steel were tested to failure at elevated temperatures under multiaxial stress states, uniaxial tension using smooth bar specimens, biaxial shearing using double shear bar specimens, and triaxial tension using notched bar specimens. Rupture times are compared for uniaxial, biaxial, and triaxial stress states with respect to the maximum principal stress, the von Mises effective stress, and the principal facet stress. The results indicate that the principal facet stress gives the best correlation for the material investigated, and this parameter can predict creep life data under multiaxial stress states with rupture data obtained with specimens under uniaxial stresses. The results also suggest that grain boundary cavitation, coupled with localized deformation processes such as grain boudary sliding, controls the lifetimes of the specimens.