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This communication introduces a non-intrusive method for void fraction measurement and identification of two-phase flow regimes, based on ultrasonic sensing. The underlying algorithm is built upon the recently reported theory of a statistical pattern recognition method called symbolic dynamic filtering (SDF). The results of experimental validation,(More)
— In this paper, an accurate, low power CMOS temperature sensor for attachable medical devices (AMDs) is presented. The proposed temperature sensor consists of a high-slope proportional to absolute temperature (PTAT) current and reference voltage generator, a current controlled relaxation oscillator (ICRO), a digital counter, and a reference clock(More)
—This brief presents a low-voltage and low-noise ring voltage-controlled oscillator (VCO) where the phase noise performance is improved by reducing the total channel thermal noise injected into the output node of the VCO during the transition period of the output voltage swing. Implemented in a 65-nm CMOS technology, the proposed ring VCO operates from(More)
This paper presents a UHF-band RFID transmitter with a robust spur reduction technique using a DLL-based SSCG. By adopting an 8-bit DLL and Hershey-kiss modulated profile together, the SSCG shows more than a 20dB EMI reduction while providing up-, down-, and center-spread modes. Implemented in a 0.18μm CMOS process, the proposed transmitter achieves(More)
The purpose of this study was to enhance the efficiency of anaerobic co-digestion with sewage sludge using pretreatment technologies and food waste. We studied the effects of various pretreatment methods (thermal, chemical, ultrasonic, and their combination) on hydrogen production and the characteristics of volatile fatty acids (VFAs) using sewage sludge(More)
This paper presents a robust spur reduction technique using a switched-capacitor feedback differential phase-locked loop (PLL) and a delay-locked-loop (DLL)-based spread-spectrum clock generation in a UHF-band RF identification transmitter (TX). The proposed differential PLL is characterized by adopting a switched-capacitor common-mode feedback and(More)
In this study, to determine the biomass fraction to apply to the estimation of greenhouse gas (GHG) emissions from the waste incineration sector, municipal solid waste, industrial waste, and sewage sludge incineration facilities were selected and analyzed, and the biomass fractions found in these facilities were compared. The biomass fractions of Municipal(More)
A high-speed and low-power adaptable period SAR-based DAC gain calibration is presented for DSM quantization noise suppression, which completes within 10μs while dissipating 0.2mW. The proposed calibration scheme is applied to the fractional-N type frequency synthesizer which adopts an 8-bit noise-cancelling DAC. The frequency synthesizer has a range(More)
INTRODUCTION Korea has been making efforts to reduce greenhouse gas (GHG) emissions, including a voluntary commitment to the target of a 30% reduction, based on business-as-usual of the total GHG emission volume, by 2020; 2006 IPCC Guidelines provided default values, applying country-specific emission factors was recommended when estimating national(More)
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