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A CMOS Low-pass Filter With Group Delay Cancellation using Non-Foster Element Circuits
Quang-Huy Do,Tan-Binh Ngo,Sang-Woong Yoon 대한전자공학회 2024 Journal of semiconductor technology and science Vol.24 No.2
We presented a CMOS lumped-element (LE) low-pass filter (LPF) with a group delay (GD) cancellation technique that uses parallel resonators comprising negative inductance and negative capacitance circuits. An inherent positive GD from the LEs of the LPF is canceled by a negative GD from the resonator. The LPF was implemented in the Global Foundry 8SF 130-nm RF CMOS Integrated Circuit (IC) technology. The core chip size was 1135 µm 474 µm. The maximum passband frequency of the LPF was measured to be 1.5 GHz with a return loss of more than 10 dB, in-band loss of 0.8‒2.4 dB, and out-of-band roll-off rate of 41.5 dB/GHz. The GDs at frequencies below 1 GHz were 0.31‒0.33 ns and decreased to zero at 1.51 GHz. The noise figures were around 13.4‒17.7 dB.
Van Loi TA,Anh Duc DO,To Uyen PHAN,Quang Huy NGUYEN,Thi Thuy Hong NGUYEN,Thuy Duong LE,Thanh Phong NGUYEN 한국유통과학회 2021 The Journal of Asian Finance, Economics and Busine Vol.8 No.4
This study aimed to explore the factors affecting the foreign direct investment (FDI) intentions of investors into Quang Ninh province, located in the north-eastern of Viet Nam. Researchers used two main methods, namely, Exploratory Factors Analysis (EFA) and the Structural Equation Model (SEM) based on partial least squares structural equation modeling (PLS SEM) to explore and measure the impact of factors affecting the investors’ FDI intentions into Quang Ninh province. The empirical analysis used data from the survey of 206 domestic and foreign investors into Quang Ninh province, including representatives of the Board of Directors, members, and management representatives at the department level, with reliable tools (SPSS 26 and SmartPLS 3.0 software). The research results identified the following factors affecting investment into Quang Ninh: FDI attraction policies have the strongest impact on the investors’ FDI intentions; it is followed by infrastructure, public services and human capital with strong effects on intentions of investors’ FDI; and finally the standards of living that affects the investors’ FDI intentions. There is also a positive relationship between all the factors and the investors’ FDI intentions. Several recommendations are further suggested to enhance attraction of foreign direct investment into Quang Ninh province.
Conceptual design of a very low head double effect bulb hydro turbine blade
Quang Huy Nguyen(응웬광휘),Ujjwal Shrestha(쉬레스트 우즈왈),Young-Do Choi(최영도) 대한기계학회 2020 대한기계학회 춘추학술대회 Vol.2020 No.8
Seventy-one percent of the Earth’s surface is covered by sea with an enormous source of renewable energy, including tidal energy, marine current energy, wave energy, ocean thermal energy, salinity gradient energy. The tidal energy is a form of hydroelectric generation base on the change of sea level caused by the gravitational effect of the moon and sun on the ocean. The flood and ebb tides allow the water to rush into, and out. The flow of water generates enough power to rotate the turbines to create electricity. However, there exist some barriers to design the turbine such as variation of head and flow rate. Therefore, the bulb turbine type are the best adapted for the tidal power plant because of wide operating rage with relatively high efficiency. The design method is based on the lifting method. By using CFD analysis (ANSYS CFX), with the normal direction flow, the bulb turbine can reach 83.53% of efficiency at design point and 85.87% of efficiency at best efficiency point (BEP), with the inverse direction flow, the bulb turbine can reach 64% of efficiency at design point and 74.59% of efficiency at the BEP. [그림 본문 참조]
A Vapor Sensor Based on a Porous Silicon Microcavity for the Determination of Solvent Solutions
Huy Bui,Thuy Van Nguyen,The Anh Nguyen,Thanh Binh Pham,Quoc Trung Dang,Thuy Chi Do,Quang Minh Ngo,Roberto Coisson,Van Hoi Pham 한국광학회 2014 Current Optics and Photonics Vol.18 No.4
A porous silicon microcavity (PSMC) sensor has been made for vapors of solvent solutions, and a method has been developed in order to obtain simultaneous determination of two volatile substances with different concentrations. In our work, the temperature of the solution and the velocity of the air stream flowing through the solution have been used to control the response of the sensor for ethanol and acetone solutions. We study the dependence of the cavity-resonant wavelength shift on solvent concentration, velocity of the airflow and solution temperature. The wavelength shift depends linearly on concentration and increases with solution temperature and velocity of the airflow. The dependence of the wavelength shift on the solution temperature in the measurement contains properties of the temperature dependence of the solvent vapor pressure, which characterizes each solvent. As a result, the dependence of the wavelength shift on the solution temperature discriminates between solutions of ethanol and acetone with different concentrations. This suggests a possibility for the simultaneous determination of the volatile substances and their concentrations.
Do, Khac Phong,Nguyen, Ba Tung,Nguyen, Xuan Thanh,Bui, Quang Hung,Tran, Nguyen Le,Nguyen, Thi Nhat Thanh,Vuong, Van Quynh,Nguyen, Huy Lai,Le, Thanh Ha Korea Information Processing Society 2015 Journal of information processing systems Vol.11 No.4
This paper presents the applications of spatial interpolation and assimilation methods for satellite and ground meteorological data, including temperature, relative humidity, and precipitation in regions of Vietnam. In this work, Universal Kriging is used for spatially interpolating ground data and its interpolated results are assimilated with corresponding satellite data to anticipate better gridded data. The input meteorological data was collected from 98 ground weather stations located all over Vietnam; whereas, the satellite data consists of the MODIS Atmospheric Profiles product (MOD07), the ASTER Global Digital Elevation Map (ASTER DEM), and the Tropical Rainfall Measuring Mission (TRMM) in six years. The outputs are gridded fields of temperature, relative humidity, and precipitation. The empirical results were evaluated by using the Root mean square error (RMSE) and the mean percent error (MPE), which illustrate that Universal Kriging interpolation obtains higher accuracy than other forms of Kriging; whereas, the assimilation for precipitation gradually reduces RMSE and significantly MPE. It also reveals that the accuracy of temperature and humidity when employing assimilation that is not significantly improved because of low MODIS retrieval due to cloud contamination.
Homogeneous Disturbance Observer Based on Sliding Mode Observer and Controller for T-Type Inverter
Do Tuan Anh,Pham Quoc Huy,Giap Van Nam,Nguyen Quang Dich,Vu Phuong 대한전기학회 2024 Journal of Electrical Engineering & Technology Vol.19 No.3
This paper proposes a novel sliding mode control (SMC) for the T-Type inverter in the standalone mode. Firstly, the accuracy of the estimated states used to construct the fxed-time SMC and the disturbance observer (DOB) is improved by a proposed sliding mode observer (SMO). Secondly, a DOB is designed without the requirement of the frst derivative or the format of the disturbance. Thirdly, an advanced reaching law is utilized for both the SMO, the DOB, and the SMC controller for the chattering elimination. Fourth, the stability of the proposed controller is confrmed by the Lyapunov condition. The performance of the proposed control strategy is validated by simulations and experiments with the same scenarios of nonlinear load and parameter variations. The results prove that the output voltage of the proposed control method meets the standard EN 62040 with the total harmonic distortion being lower than 5% in all cases, which is superior to the performance of the traditional controller.
( Khac Phong Do ),( Ba Tung Nguyen ),( Xuan Thanh Nguyen ),( Quang Hung Bui ),( Nguyen Le Tran ),( Thi Nhat Thanh Nguyen ),( Van Quynh Vuong ),( Huy Lai Nguyen ),( Thanh Ha Le ) 한국정보처리학회 2015 Journal of information processing systems Vol.11 No.4
This paper presents the applications of spatial interpolation and assimilation methods for satellite and ground meteorological data, including temperature, relative humidity, and precipitation in regions of Vietnam. In this work, Universal Kriging is used for spatially interpolating ground data and its interpolated results are assimilated with corresponding satellite data to anticipate better gridded data. The input meteorological data was collected from 98 ground weather stations located all over Vietnam; whereas, the satellite data consists of the MODIS Atmospheric Profiles product (MOD07), the ASTER Global Digital Elevation Map (ASTER DEM), and the Tropical Rainfall Measuring Mission (TRMM) in six years. The outputs are gridded fields of temperature, relative humidity, and precipitation. The empirical results were evaluated by using the Root mean square error (RMSE) and the mean percent error (MPE), which illustrate that Universal Kriging interpolation obtains higher accuracy than other forms of Kriging; whereas, the assimilation for precipitation gradually reduces RMSE and significantly MPE. It also reveals that the accuracy of temperature and humidity when employing assimilation that is not significantly improved because of low MODIS retrieval due to cloud contamination.