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Microwave Power Transmission Using a Sequential Phase Ring Transmitting Antenna
Danh Manh Nguyen(응웬단만),Chulhun Seo(서철헌) 대한전기학회 2021 대한전기학회 학술대회 논문집 Vol.2021 No.10
This paper presents a sequential transmitting antenna (Tx) for microwave power transmission (MPT) system. The design concept consists of an array of four patch element fed by a sequential phase rotation (SPR) ring with a compact size and LHCP maximum gain of 11.98 dBi at 5.8 GHz. To verify the system charging ability while on the move, alternate rotation and displacement coordinate case are performed.
Low Power 6-b CMOS Folding-Interpolating A/D Converter
Danh-Cuong Do,Zhi-Yuan Cui,Nam-Soo Kim 대한전자공학회 2007 ITC-CSCC :International Technical Conference on Ci Vol.2007 No.7
An 6-bit CMOS folding-interpolating analog-todigital converter (ADC) is presented. The operation of current steering folding amplifier and current-mode interpolation performance are described. Simulated in a 0.35 ㎛ 1p4m CMOS process, careful circuit design leads to a high-speed (250 Ms/s) and low power (18 ㎽ in 3.3 V supply voltage) ADC. Simlation results also show both integral and differential non-linearity (INL, DNL) are within ±0.2 lsb and signal-to-noise-and-distortion ratio (SNDR) of 37.1 ㏈ at 250 Mhz/s sampling rate.
[ICACE2022] Model identification of two double-acting pistons pump
Danh Khoa Nguyen,Cong Toai Truong,Van Tu Duong,Huy Hung Nguyen,Tan Tien Nguyen 한국마린엔지니어링학회 2023 한국마린엔지니어링학회지 Vol.47 No.2
The Covid-19 pandemic has had a comprehensive and far-reaching impact on various fields, especially in the medical aspect. Additionally, many variants of this coronavirus have appeared due to mutation, each of which has distinguished influences. During the Covid-19 pandemic, medical equipment, especially ventilators, has seen a severe shortage. Thus, many studies of ventilators machine have been carried out around the world. And according to these studies, airflow control is one of the critical issues of ventilator machine research that saves human life. Understanding the above problem, it is necessary to conduct system modeling and obtain a model which has high linearity so that the parameters of the ventilation can be controlled to achieve better accuracy. This paper presents the model identification of a two double-acting piston pump system using experimental data. First order plus dead time method is applied to achieve the identification model. The data used for identification and validation are collected by conducting several practical tests on the two double-acting pistons pump system. The discussion on the identified model and future works are also included in this paper.
Effect of Mn, Fe to cerium vanadate catalyst for NOx reduction with NH3
( Danh Thi Huong ),하헌필,정영은,( Pullur Anil Kumar ),최현 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.0
The effect of Mn- and Fe- to cerium vanadate supported on TiO2-WO3-SiO2 catalyst were prepared and applied to SCR reaction. The properties of these catalysts were characterized by BET surface area, temperature programmed desorption/ reduction, X-ray diffraction methods. The preparation methods were compared. The catalysts showed high activity at high temperatures by ball-mill method. Cerium vanadate catalyst with Fe loaded exhibited higher NOx conversion than Mn loaded one at broad temperature range (250-500°C). The effect of aging condition was also investigated. The redox and acid/base properties of catalyst played important roles on the performance of catalyst.
The influence of monoethanolamine on the V-based catalyst activity for NH<sub>3</sub>-SCR reaction
( Danh Thi Huong ),하헌필,정영은,최현,( Pullur Anil Kumar ) 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.1
V-Sb/CeO<sub>2</sub>-TiO<sub>2</sub> catalyst was prepared by wet impregnation and deposition precipitation methods for the removal of NOx by NH<sub>3</sub>. The effect of MEA was examined by the number of acidic sites and reduction properties of catalyst by NH<sub>3</sub>-Temperature Programmed Desorption (NH<sub>3</sub>-TPD), H<sub>2</sub>-Temperature Programmed Reduction (H<sub>2</sub>-TPR). The specific functional groups on catalyst’s surface were determined by Fourier transform infrared spectroscopy (FTIR). The characterization studies revealed the enhancement of number of reducible species and acidic sites at low temperature on catalyst added MEA than other catalysts.