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Jaehee Cho,Euijoon Yoon,Hyunsoo Kim,Yongjo Park,Joon Seop Kwak IEEE 2008 Photonics Technology Letters Vol.20 No.13
<P>Improved emission efficiency in InGaN near-ultraviolet light-emitting diodes (LEDs) was demonstrated using reverse bias in pulsed voltage operation. Pulsed voltage operation of the LEDs from 3 to 3.2 V with a duty cycle of 50% at Hz produced a radiant flux of 4.0 mW, while pulsed operation from 0 to 3.2 V showed a radiant flux of 3.2 mW. The radiant flux further increased as the reverse voltage increased, at the same forward voltage. The improved radiant flux was attributed to uniform carrier redistribution at the multiquantum wells, due to a periodically applied voltage from reverse voltage to forward voltage with a frequency ranged from to Hz, resulting in improved emission efficiency in InGaN LEDs.</P>
Cho Jaehee,Song Youhyun,이지연,Lee Daeun,Go Yunsun,Kang Hee Cheol 대한가정의학회 2021 Korean Journal of Family Medicine Vol.42 No.3
Pancytopenia represents a unique challenge for primary care doctors and its etiological causes encompass various specialties, including hematology and rheumatology. Despite the existence of effective tests such as bone marrow biopsy and immunoassays to rule out the potential causes of pancytopenia, it is often difficult to pinpoint the exact diagnosis. In this case report, we have described such a ‘gray zone’ patient, who presented with pancytopenia, neutropenia, and splenomegaly, and was being treated for fungal pneumonia before being transferred to Severance Hospital (department of family medicine). As the patient had a 10-year history of multiple, long-term hospital admissions that were having a severely debilitating impact on the quality of life, we performed a partial splenic embolization as a potential cure for the symptoms. Although this induced acute blood count recovery, it failed to prevent eventual mortality from septic shock.