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Magnetic Resonance WPT System Using a Planar Receiver for Mobile Applications
Van Thuan Nguyen(응웬반투언),Seok Hyon Kang(강석현),Chang Won Jung(정창원) 한국산학기술학회 2015 한국산학기술학회 학술대회 Vol.2015 No.1
In this study, a wireless power transfer (WPT) system including three coils and working at 6.78 MHz is investigated. By employing a 2 x 3 metamaterial (MTM) array, the efficiency of the proposed WPT system is significantly enhanced. Experiments show that with the MTM array, a maximum efficiency improvement of 27 % is achieved at transfer distance of 35 cm. The impact of ground plane on the transfer efficiency is also studied. Several methods to reduce this impact are discussed and measured.
Cascaded Single-Phase Boost Inverter Using High Frequency Transformer
( Van Thuan Tran ),( Tan Tai Tran ),( Minh Khai Nguyen ),( Hong Woo Lim ),( Won Bae Kim ) 조선대학교 공학기술연구원 2016 공학기술논문지 Vol.9 No.1
Quasi-switched boost inverter was investigated to replace Z-source inverter and switched-boost inverter in the field of low power applications because it uses one-LC-pair less than Z-source inverter. In this paper, we suggest the configuration of H-bridge quasi-switched boost inverter based on high frequency transformer (H-qSBI) to improve voltage gain factor. The proposed topology contains the same devices like switched boost inverter, where the active switch is replaced by an H-bridge inverter. This paper focuses on analyzing quasi-switched boost inverter (qSBI) implementation and simulating the performing results of cascaded single-phase dual-inverter using high frequency transformer by PSIM simulation software. The results are tested by an input DC voltage of 36 V to generate an AC voltage of 220Vrms/50Hz.
Radiation-Pattern Reconfigurable Antenna for Medical Implants in MedRadio Band
Van Thuan Nguyen,Chang Won Jung IEEE 2016 IEEE antennas and wireless propagation letters Vol.15 No.-
<P>The objective of this letter is to design a radiation-pattern reconfigurable antenna that operates at the Medical Device Radio communications Service band (MedRadio band: 401-406 MHz) for medical implants. By spiraling a monopole, an antenna miniaturization is accomplished. Two artificial switches are employed to perform a radiation-pattern reconfigurable property. The proposed antenna has dimensions of 28 mm x 11.5 mm x 0.6 mm (193.2 mm(3)) and utilizes sub-strate (FRA epsilon(r) = 4.4). A one-layer skin model (epsilon(r) = 46.74, sigma = 0.69 S/m) is adopted for the antenna simulation and in vitro test.</P>
Thuan Nguyen Van,노혁천 대한토목학회 2017 KSCE JOURNAL OF CIVIL ENGINEERING Vol.21 No.4
In this study, the stochastic finite element solution is given to obtain the response variability in the natural frequency of Functionally Graded Material (FGM) beam due to uncertain structural parameters. Among others, the elastic modulus and mass density are chosen to have randomness along the beam axis direction, which are modeled as one-dimensional homogeneous stochastic processes. The stochastic analysis of the FGM beam is performed in conjunction with Monte Carlo simulation (MCS). Random samples of random parameters are generated based on the spectral representation method. The response variability in the natural frequency of FGM beam, due not only to the single random parameter of elastic modulus or mass density but also to both of the random parameters taken into account at the same time is investigated. The effect of respective random parameters on the response variability of natural frequency and the effect of correlation between the two random parameters as well are discussed in detail.
Numerical Investigation of Motion Response of the Tanker at Varying Vertical Center of Gravities
Van Thuan Mai,Thi Loan Mai,Hyeon Kyu Yoon 한국해양공학회 2024 韓國海洋工學會誌 Vol.38 No.1
The vertical center of gravity (VCG) has a significant impact on the roll motion response of a surface ship, particularly oil tankers based on the oil level in the tanker after discharging oil at several stations or positional changes, such as changes in the superstructure and deck structure. This study examined the motion response of the Korea very large crude carrier 2 (KVLCC2) at various VCGs, especially roll motion when the VCG changed. The potential theory in the Ansys AQWA program was used as a numerical simulation method to calculate the motion response. On the other hand, the calculations obtained through potential theory overestimated the roll amplitudes during resonance and lacked precision. Therefore, roll damping is a necessary parameter that accounts for the viscosity effect by performing an experimental roll decay. The roll decay test estimated the roll damping coefficients for various VCGs using Froude’s method. The motion response of the ship in regular waves was evaluated for various VCGs using the estimated roll-damping coefficients. In addition, the reliability of the numerical simulation in motion response was verified with those of the experiment method reported elsewhere. The simulation results showed that the responses of the surge, sway, heave, pitch, and yaw motion were not affected by changing the VCG, but the natural frequency and magnitude of the peak value of the roll motion response varied with the VCG.
The Multidimensional Masculinity in Nguyễn Huy Thiệp’s Short Stories
( Van Thuan Nguyen ),( Anh Dan Nguyen ),( Van Luan Nguyen ) 부산외국어대학교 아세안연구원 2024 Suvannabhumi Vol.16 No.1
Nguyễn Huy Thiệp is a pillar in Vietnamese cultural life after the Second Indochina War, and the fates of men and women at the beginning of Đổi mới (Renovation) is one of the prominent themes in his short stories. To show off sexual power, seek glory, and maintain his dominant position, Thiệp’s heroes engage in a game of oppressing the weak, hunting animals, and harassing women. However, due to the complex changes in social life, moral values, and gender inequality, men in the postwar period quickly experienced the feeling of humiliation, impotence, and failure. In turn, the sophisticated aspects of masculinity demonstrate the cultural and ethical concerns of contemporary Vietnamese society. By exploring the multidimensional nature of masculinity expressed in Thiệp’s stories, this study aims to resolve misconceptions about gender and the relationship between men and women in his work.