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Nguyen Van Hung,Bui Thi Minh Nguyet,Nguyen Huu Nghi,Nguyen Minh Luon,Nguyen Ngoc Bich,Le Van Thanh Son,Nguyen Trung Kien,Dao Ngoc Nhiem,Nguyen Thanh Tuoi,Dinh Quang Khieu 대한환경공학회 2024 Environmental Engineering Research Vol.29 No.4
In the present work, ZnO/g-C₃N₄/biochar was prepared, and it was used for visible-light driven photocatalytic degradation of some colorants (methylene blue, rhodamine B, methyl orange) and some antibiotics (doxycycline, ciprofloxacin, amoxicilline). Biochar was prepared by pyrolysing Phragmites australis biomass. The ZnO/g-C₃N₄/biochar composite was synthesized with the alkaline hydrolysis method. The obtained materials were characterized by X-ray diffraction, scanning electron microscopy, transition electron microscopy, energy dispersive X-ray/elemental mapping, ultraviolet-visible-diffuse reflectance spectroscopy, photoluminescence spectroscopy, nitrogen adsorption/desorption isotherms and X-ray photoelectron spectroscopy. The results show that ZnO nanoparticles with a large surface area are highly dispersed on the g-C₃N₄ particle surface and biochar. The composite exhibits superior photocatalytic degradation ability toward doxycycline, a broad-spectrum antibiotic of the tetracycline compared with individual components (ZnO or g-C₃N₄) and satisfies stability after six treatment cycles. The kinetics and degradation mechanisms of doxycyline were also addressed. In addition, the present catalyst also exhibits the photocatalytic degradation of methylene blue, rhodamine B, methyl orange, ciprofloxacin and amoxicillin in visible-light regions.
Improved object recognition performance of UWB radar according to different window functions
Trung Kien Nguyen,홍익표 한국전기전자학회 2019 전기전자학회논문지 Vol.23 No.2
In this paper, we implemented an Ultra-Wideband radar system using Stripmap Synthetic Apertrure Radar algorithm torecognize objects inside a box. Different window functions such as Hanning, Hamming, Kaiser, and Taylor functions toimprove image recognition performance are applied and implemented to radar system. The Ultra-Wideband radar system with3.1~4.8 GHz broadband and UWB antenna were implemented to recognize the conductor plate located inside 1m3 box. Toobtain the image, we use the propagation data in the time domain according to the 1m movement distance and use the RangeDoppler algorithm. The effect of different window functions to improve the recognition performance of the image areanalyzed. From the compared results, we confirmed that the Kaiser window function can obtain a relatively good image.
Nguyen Trung Kien,홍익표 대한전기학회 2020 Journal of Electrical Engineering & Technology Vol.15 No.2
A 3D band pass frequency selective surface structure with desired center frequency and bandwidth, designed by multiobjective optimization algorithms, is introduced in this paper. The ant colony optimization technique is used to achieve optimal design properties with the required characteristics. The performance of the manufactured structure using the 3D printing method is measured to verify the optimized structure for normal incidence. Come up with the results, the convenience of the optimization algorithm accordingly 3D printing can help in designing and constructing complex 3D structures.
Nguyen, Trung-Kien,Oh, Nam-Jin,Le, Viet-Hoang,Lee, Sang-Gug IEEE 2006 IEEE transactions on microwave theory and techniqu Vol.54 No.2
A low-power low flicker-noise receiver front-end for 915-MHz-band IEEE 802.15.4 standard in 0.18-μm CMOS technology is implemented. A power-constrained simultaneous noise and input matching low-noise amplifier (LNA) can be achieved by using a conventional inductive degeneration cascode amplifier with an extra gate-source capacitor. In combination with the LNA, a passive mixer showing low 1/f noise performance is adopted to convert the RF signal directly to the baseband signal. The measured results show a conversion gain of 30 dB and a noise figure of 3 dB with 1/f noise corner frequency of 30 kHz. Two-tone test measurements indicate -5-dBm input third-order intercept point and +45-dBm input second-order intercept point. The RF receiver front-end dissipates 2 mA from a 1.8-V supply.
Improved object recognition performance of UWB radar according to different window functions
Nguyen, Trung Kien,Hong, Ic-Pyo Institute of Korean Electrical and Electronics Eng 2019 전기전자학회논문지 Vol.23 No.2
In this paper, we implemented an Ultra-Wideband radar system using Stripmap Synthetic Apertrure Radar algorithm to recognize objects inside a box. Different window functions such as Hanning, Hamming, Kaiser, and Taylor functions to improve image recognition performance are applied and implemented to radar system. The Ultra-Wideband radar system with 3.1~4.8 GHz broadband and UWB antenna were implemented to recognize the conductor plate located inside 1m3 box. To obtain the image, we use the propagation data in the time domain according to the 1m movement distance and use the Range Doppler algorithm. The effect of different window functions to improve the recognition performance of the image are analyzed. From the compared results, we confirmed that the Kaiser window function can obtain a relatively good image.
Design challenges for 13.56MHz 10 kW resonant inverter for wireless power transfer systems
Nguyen Kien Trung,Kan Akatsu 전력전자학회 2019 ICPE(ISPE)논문집 Vol.2019 No.5
This paper presents the design process of a 13.56 MHz 10 kW and high efficiency inverter for wireless power transfer systems. The main challenges that are the effect of the parasitic components, the using of the high-speed switching devices and the inverter topology are discussed. Finally, an optimal design of 10kW inverter using E-mode GaN is shown with the efficiency of over 95%.
( Trung Kien Nguyen ),( Kyung Hoan Im ),( Jaehyuk Choi ),( Pyung Gyun Shin ),( Tae Soo Lee ) 한국균학회 2016 Mycobiology Vol.44 No.4
Culinary mushroom Pleurotus pulmonarius has been popular in Asian countries. In this study, the anti-oxidant, cholinesterase, and inflammation inhibitory activities of methanol extract (ME) of fruiting bodies of P. pulmonarius were evaluted. The 1,1-diphenyl-2-picryl-hydrazy free radical scavenging activity of ME at 2.0 mg/mL was comparable to that of butylated hydroxytoluene, the standard reference. The ME exhibited significantly higher hydroxyl radical scavenging activity than butylated hydroxytoluene. ME showed slightly lower but moderate inhibitory activity against acetylcholinesterase (AChE) and butyrylcholinesterase than galantamine, a standard AChE inhibitor. It also exhibited protective effect against cytotoxicity to PC-12 cells induced by glutamate (10~100 μg/mL), inhibitory effect on nitric oxide (NO) production and inducible nitric oxide synthase protein expression in lipopolysaccharide-stimulated RAW 264.7 macrophages, and carrageenan-induced paw edema in a rat model. Highperformance liquid chromatography analysis revealed the ME of P. pulmonarius contained at least 10 phenolic compounds and some of them were identified by the comparison with known standard phenolics. Taken together, our results demonstrate that fruiting bodies of P. pulmonarius possess antioxidant, anti-cholinesterase, and inflammation inhibitory activities.
Acetylcholinesterase, inflammation, and diabetic inhibitory activities of Lentinus giganteus
Trung Kien Nguyen,Do Bin Shin,Jae Hyuk Choi,Kyung Hoan Im,Min Woong Lee,Pyung Gyun Shin,Tae Soo Lee 한국버섯학회 2014 버섯 Vol.18 No.1
Lentinus giganteus is a edible mushroom cultivated in Asian countries. The present study was initiated to evaluate the anti-inflammatory, anti-acetylcholinesterase, anti-α-glucosidase, and free radical scavenging activities from fruiting bodies of L. giganteus extracted with methanol and hot water. The free radical scavenging activities of methanol and hot water extracts on 1,1-diphenyl-2-picrylhydrazyl (DPPH) were 92.26% and 90.17% at 2.0 mg/mL concentration, respectively and comparable with positive control, BHT. The chelating activities of methanol and hot water extracts were significantly higher than the positive control tested. The reducing power of methanol and hot water extracts showed lower activities compared to positive control, BHT. The phenolic and flavonoid contents of hot water extract were 1.56 μg/mg and 24.35 μg/mg, respectively. Nitric oxide (NO) produced by lipopolysaccahride (LPS) activated RAW 264.7 cells were significantly inhibited by treatment of methanol and hot water extracts. The methanol extract inhibited the acetylcholinesterase (AChE) activity by 91.19% at the 2.0 mg/mL concentration, whereas galanthamine, the standard drug, inhibited the AChE activity by 97.80%. The hot water extracts inhibited the α-amylase and α-glucosidase activities by 78.86% and 80.78%, respectively at the 2.0 mg/mL concentration, while acarbose, the positive control, inhibited the activities by 89.91% and 81.81%, respectively at the same concentration. Therefore, it is concluded that fruiting bodies of L. giganteus contain antioxidant, anti-inflammatory, anti-cholinesterase, and anti-diabetic substances, which can be used for natural health food for promoting human health.