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Le Thu Trang,Dinh-Toi Chu,Nguyen Thi Hong Hanh,Nguyen Nam Trung 질병관리본부 2019 Osong Public Health and Research Persptectives Vol.10 No.2
Objectives: To identify trends in percentage body fat (PBF) in adolescents to determine gender-specific classification thresholds for being overweight and obese. Methods: A cross-sectional study of 899 adolescents (11 to 14.5 years) from Hanoi and Nam Dinh was conducted in Vietnam. PBF, subcutaneous fat and percentage of lean mass were measured directly using OMRON HBF 375 scales to measure bioelectrical impedance. Results: PBF decreased in boys with increasing age (p < 0.001). The difference in PBF between boys and girls, significantly increased with age after 12.5 years (p < 0.001). There was a stronger correlation between PBF and fat content (Pearson’s r = 0.860, p < 0.0001) than that between (BMI) and fat content (Pearson’s r = 0.521, p < 0.0001). The prevalence of being overweight or obese in girls was similar when determined by PBF or BMI. Hanoi had higher rates of adolescents being overweight or obese compared with Nam Dinh. Conclusion: PBF provides a more accurate body assessment for being overweight or obese in adolescents compared with BMI.
Numerical Simulation for Ship Auto Track-keeping Control in Berthing situation
Le Thanh Dat,Nam-kyun Im,Sang-Min Lee 해양환경안전학회 2013 해양환경안전학회 학술발표대회 논문집 Vol.2013 No.04
In the field of study about the maritime safety system various reports have been given on the research of ship auto control over a long time but lack of auto control designed for auto berthing control. This paper deals with ship"s track keeping control on
Free-Positioning Wireless Power Transfer Using a 3D Transmitting Coil for Portable Devices
Nam Ha-Van,Hoang Le-Huu,Minh Thuy Le,Kwangsuk Park,Chulhun Seo 한국전자파학회JEES 2020 Journal of Electromagnetic Engineering and Science Vol.20 No.4
The free-positioning wireless power transfer (WPT) system has drawn attention in recent years. Traditionally, a WPT system can transfer energy in one or two directions on the same plane, but it leads the restrictions of angle and axis misalignment between a transmitter and a receiver coil. In this paper, we propose a free-positioning WPT system using a three-dimensional cubic-shaped transmitting coil for portable device charging. A small receiving coil is placed inside the transmitter to achieve the transferred energy through the magnetic resonant coupling. In addition, the equivalent circuit and the mutual inductance between the Tx and Rx coils are analyzed. Finally, a practical experiment is implemented to verify the transfer performance, which can reach up to about 50% power transfer efficiency. The proposed system can charge in spatial freedom.
Le Vu Nam,Changwook Seol(설창욱),Tuyet Anh Pham,Segeun Jang(장세근),Sang Moon Kim(김상문) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.4
Elevated temperature operating polymer electrolyte membrane fuel cells have gained considerable interest owing to good electrode kinetics, high CO tolerance, and improved heat management. It was supposed that inserting inorganic fillers (SiO<SUB>2</SUB>, TiO<SUB>2</SUB>, etc.,) in the Nafion® membrane can retain water under higher temperature, low humidity operating condition. This incorporation would increase the electrochemical performance of the membrane. Conventionally, many researches inserted the inorganic fillers utilizing casting and evaporation approach. However, this method decreases proton pathways and induces agglomeration, thus would not significantly increase the efficiency of the membrane. Here in, homogeneous patterned TiO<SUB>2</SUB> have been added onto the anode side of the electrolyte membrane. The addition of patterned TiO<SUB>2</SUB> not only manages the agglomeration of inorganic filler but also maintains the ionic conductivity of the membrane. This resulted in enhanced the maximum power output of the membrane electrode assembly by more than 35% compare to the to the conventional Nafion® MEA under intermediate temperature.
A Frequency Domain Equalization Algorithm for Fast Time-Varying Fading Channels
Le-Nam Tran,Een-Kee Hong,Huaping Liu 한국통신학회 2009 Journal of communications and networks Vol.11 No.5
Conventional frequency domain equalization (FDE) schemes were originally devised for quasi-static channels. Thus, such equalization schemes could suffer from significant performance degradation in fast-fading channels. This paper proposes a frequency domain equalization algorithm to mitigate the effect of fast time-varying fading. First, a mathematical expression is derived to quantify the total interference resulting from the time variation of the channel. Then, the proposed approach attempts to eliminate the effect of time-variations of the channel. This cancellation allows efficient use of the classical FDE structures in fast time-varying fading environments, although they are built upon the quasi-static channel model. Simulation results of bit-error-rate performance are provided to demonstrate the effectiveness of the proposed algorithm.