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고기범(Gi-Beom Ko),정장원(Jang-Won Jung),김도연(Do-Yeon Kim),전범조(Beom-Cho Jun) 대한두개저학회 2017 대한두개저학회지 Vol.12 No.1
Benign tumors of the middle ear cavity have wide spectrum of diseases. Facial nerve Schwannomas which arise along the facial nerve course are rare benign neoplasms that can be found in the middle ear cavity. Ipsilateral facial palsy and hearing impairment are the most common presentations. But because of the diversity of symptoms ranging from asymptomatic to atypical manifestations, the exact diagnosis of facial nerve Schwannoma may be difficult and the treatment can be delayed. Therefore, early diagnosis and treatment strategies are essential to preserve audiologic, vestibular and facial nerve function. We report a case of the facial nerve Schwannoma in intratemproal area masquerading as other benign tumors of middle ear cavity such as tympanic paraganglioma in a 58-year-old man presenting with left earfullness and hearing impairment without presenting facial palsy. We describe the diagnosis and the treatment strategies of facial nerve Schwannoma.
The Effects of Growth Temperature and Substrate Tilt Angle on GalnP/GaAs Tandem Solar Cells
Jun, Dong-Hwan,Kim, Chang-Zoo,Kim, Hog-Young,Shin, Hyun-Beom,Kang, Ho-Kwan,Park, Won-Kyu,Shin, Ki-Soo,Ko, Chul-Gi The Institute of Electronics and Information Engin 2009 Journal of semiconductor technology and science Vol.9 No.2
The performance of GaInP/GaAs tandem solar cells with AlInP growth temperatures of 680$^{\circ}C$ and 700 $^{\circ}C$ on n-type GaAs (100) substrate with 2$^{\circ}$ and 6$^{\circ}$ tilt angles has been investigated. The series resistance and open circuit voltage of the fabricated tandem solar cells are affected by the substrate tilt angles and the growth temperatures of the window layer when zinc is doped in the tunnel diode. With carbon doping as a p-type doping source in the tunnel diode and the effort of current matching between top and bottom cells, GaInP/GaAs tandem solar cell has been exhibited 25.58% efficiency.