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Opto-Electric Analog SRAM Device Based on Commercial LEDs and Photodetectors
이민종,최민구,김태욱,이보원,이영택 한국물리학회 2019 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.74 No.12
In this paper, we propose an opto-electric analog static random-access memory (OE-ASRAM) structure consisting of two opto-electric inverters as a flip-flop circuit. The opto-electric inverter is constructed as a photosensor-based inverter with a light-emitting diode (LED), such as a light generator, considered as an input analog signal, and is transmitted to a photosensor for generating an output voltage, considered as a digital signal. This operates as an inverter and can be considered as an analog-to-digital converter (ADC). By adding metal-oxide-semiconductor field-effect transistor (MOSFET) (current switch) and second LED (output photo signal generator), we can convert the digital signal (electric) to an analog signal (photo) as a digital-to-analog converter (DAC). By constructing two opto-electric inverters as a flip-flop structure, we achieve an OE-ASRAM circuit that works as a common SRAM that can store 1-bit data from both analog (photo) and digital signals. In this paper, we present the operation characteristics of the opto-electric inverter, as well as the proposed OE-ASRAM circuit with two uncommon access methods of mechanical screening and laser lighting. The proposed OE-ASRAM structure can be used as the basic building structure for mixed signal processors that can store data for both analog (photo) and digital inputs.
Is Partial Splenic Embolization a Good Option to Prevent Cirrhotic Complications in the Long Term?
이민종 대한의학회 2019 Journal of Korean medical science Vol.34 No.30
Kim et al.1 recently reported that partial splenic embolization (PSE) had good safety and efficacy to increase platelet counts in hepatocellular carcinoma (HCC) patients with thrombocytopenia who underwent trans-arterial chemoembolization (TACE). In this study, 18 HCC patients with severe thrombocytopenia (< 50 × 109 /L) who underwent PSE concurrently with TACE (PSE group) and 72 controls who underwent TACE alone (non-PSE group) were enrolled. Regarding efficacy of PSE, platelet counts in the PSE group were significantly increased compared with those in the non-PSE group. Splenic infarction rates were significantly associated with increase in platelet counts after PSE with the median splenic infarction rates of 77.8%. Regarding safety of PSE in this study, the Child-Turcotte-Pugh scores within 6 months after treatment in the PSE group were significantly higher than those in the non-PSE-group. However, there was no significant difference of severe adverse events occurred in the two group: 11.1% and 9.7% of patients in the PSE and non-PSE groups, respectively.1