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Design of a High-Hole-Mobility Ge Transistor for Si-Driven Heterogeneous Integrated Circuits
조용범,유은선,조성재 한국과학기술원 반도체설계교육센터 2017 IDEC Journal of Integrated Circuits and Systems Vol.3 No.3
A high-hole-mobility transistor (HHMT) with an intrinsic Ge channel is optimally designed and its DC and high-frequency performances are investigated by technology computer-aided design (TCAD) simulation. An HHMT with a Ge channel and AlGaAs barrier on the Si substrate is characterized with a particular interest in the barrier design. More specifically, barrier doping concentration, total barrier thickness, and high-doped barrier thickness are considered as the critical design variables. A permissibly optimized device demonstrates cut-off frequency (fT) of 20 GHz and maximum oscillation frequency (fmax) of 80 GHz at a channel length of 90 nm. The Ge HHMT with an AlGaAs barrier has the potential to be a component in the heterogeneously integrated monolithic circuits made of Si, group-IV alloys, and III-V compound semiconductors where electronic and optical devices can be simultaneously integrated with enhanced device performances.
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조용범,김태훈,문찬일,최재웅,송창섭 한국심초음파학회 2000 Journal of Cardiovascular Imaging (J Cardiovasc Im Vol.8 No.1
Myxomas are the most common primary benign cardiac tumor. In general, myxoma has a benign growth and chronic entity, so symtoms of myxoma are vague and mild. Therefore the association of an atrial myxoma with acute pulmonary edema and syncope appears to be very rare. Even though very rare, detection of myxoma is important because it is usually fatal in several cases if unrecognized and untreated. We experienced a case of left atrial (LA) myxoma presenting as acute pulmonary edema and syncope of unknown cause in 47 years old female patient. A mass located on left atrium was excised en bloc, and the patient recovered uneventfully. We report the case along with literature review.
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조용범,조형호,장수정,정한성,박종성 대한의학회 2011 Journal of Korean medical science Vol.26 No.4
The aim of this study was to determine the effects of transplanted neural differentiated human mesenchymal stem cells (hMSCs) in a guinea pig model of auditory neuropathy. In this study, hMSCs were pretreated with a neural-induction protocol and transplanted into the scala tympani of the guinea pig cochlea 7 days after ouabain injury. A control model was made by injection of Hanks balanced salt solution alone into the scala tympani of the guinea pig cochlea 7 days after ouabain injury. We established the auditory neuropathy guinea pig model using 1 mM ouabain application to the round window niche. After application of ouabain to the round window niche, degeneration of most spiral ganglion neurons (SGNs) without the loss of hair cells within the organ of Corti and increasing the auditory brain responses (ABR) threshold were found. After transplantation of neural differentiated hMSCs, the number of SGNs was increased, and some of the SGNs expressed immunoreactivity with human nuclear antibody under confocal laser scanning microscopy. ABR results showed mild hearing recovery after transplantation. Based on an auditory neuropathy animal model, these findings suggest that it may be possible to replace degenerated SGNs by grafting stem cells into the scala tympani.
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