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Trung-Kien Hoang,Do-Hyun Kang,Ji-Young Lee IEEE 2010 IEEE transactions on magnetics Vol.46 No.10
<P>We present comparisons between different kinds of transverse flux linear motor (TFLM) with various configurations of permanent magnet (PM) including without PM, side PM, and full PM in its structure. We compare one-phase and three-phase systems. All the comparisons are based on the thrust force and normal force that are derived from using the three-dimensional equivalent magnetic circuit network method. Models with side PM and three phases offer good performance of TFLM in terms of thrust force and normal force. The experimental results show good agreement with the analytic results.</P>
Ultra-Reliable and Low Latency Communication in mmWave-Enabled Massive MIMO Networks
Trung Kien Vu,Chen-Feng Liu,Bennis, Mehdi,Debbah, Merouane,Latva-aho, Matti,Choong Seon Hong IEEE 2017 IEEE COMMUNICATIONS LETTERS Vol.21 No.9
<P>Ultra-reliability and low latency are two key components in 5G networks. In this letter, we investigate the problem of ultra-reliable and low-latency communication in millimeter wave-enabled massive multiple-input multiple-output networks. The problem is cast as a network utility maximization subject to probabilistic latency and reliability constraints. To solve this problem, we resort to the Lyapunov technique, whereby a utility-delay control approach is proposed, which adapts to channel variations and queue dynamics. Numerical results demonstrate that our proposed approach ensures reliable communication with a guaranteed probability of 99.99%, and reduces latency by 28.41% and 77.11% as compared to baselines with and without probabilistic latency constraints, respectively.</P>
( 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.
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.
Wage Differentials among Ownership Groups and Worker Quality in Vietnamese Manufacturing
Kien Trung Nguyen,Eric D. Ramstetter 연세대학교 동서문제연구원 2017 Global economic review Vol.46 No.3
Wholly foreign multinational enterprises (WFs), joint-venture multinationals (JVs), state-owned enterprises (SOEs) pay higher wages than domestic private firms in Vietnamese manufacturing. In large samples of medium–large (20+ employees) firms, conditional differentials accounting for worker education and occupation, as well as capital intensity, size, and shares of female workers, were substantially smaller, but positive and significant. Wage levels and differentials varied substantially among industries. Conditional differentials remained positive and significant for WFs and JVs in most of the 11 industries examined, but estimates of SOE-private differentials were insignificant in most industries. Robustness checks using 2007 data yielded similar results.
Trung Kien Vu,Manh Kha Hoang,Hung Lan Le 한국통신학회 2019 ICT Express Vol.5 No.2
In this paper, a specific type of incomplete data in Wi-Fi fingerprinting based indoor positioning systems (WF-IPS) is presented: censored and dropped mixture data. For fitting this type of data, a censored and dropped Gaussian Mixture Model (CD-GMM) was proposed. Further, an extended version of the Expectation-Maximization (EM) algorithm is developed for estimating parameters of this model. Simulation results demonstrate the effectiveness of the proposed method for parameter estimation.
Seismic Demand Evaluation of Steel MRF Buildings with Simple and Detailed Connection Models
Kien Le-Trung,이기학,이재홍,이도형 한국강구조학회 2010 International Journal of Steel Structures Vol.10 No.1
A detailed connection model can take into account effects such as strength and stiffness degradation, pinching and brittle behavior while a simple one cannot. This study investigates the effects of using the detailed and simple connection models on the seismic behavior of steel moment resisting frame (MRF) buildings. The frame models designed by 1994 UBC and 2000IBC provisions involved the use of clear length dimensions of elements, panel zone models, and connection models subjected to suites of 20 accelerograms with 50/50, 10/50 and 2/50 hazard levels. The interstory drifts, column axial forces, and probability of building failure were investigated. The results show that the discrepancy of the building behaviors between using the detailed and simple connections became larger when the more severe seismic hazard levels and higher percentile values were considered. Therefore, the detailed connection models would be recommended to evaluate and predict seismic performance of steel MRF buildings.