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Nguyen Huu Duc,Y.D. Yao,Vu Nguyen Thuc 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.52 No.5
Magnetic tunnel junctions of the glass/Co(10 nm/Al2O3(tx)/Co50Fe50(1.8 nm)/Ni80Fe20(10 nm) conguration for tx from 1.4 to 2.6 nm were fabricated by RF-sputtering. Samples were studied by means of the atomic force microscopy (AFM), high-resolution transmission electron microscopy (HR-TEM) and tunneling magnetoresistance (TMR) measurements. The tunneling magnetoresis- tance was investigated as a function of the thickness, as well as the oxygen concentration of the insulating layer. The optimum conguration was obtained for tx = 1.8 nm. In this case, a mag- netoresistance of 12 % was reached in an applied eld of about 2 mT. From analyses of the I-V characteristics, theeectivebarrierwidthandheightoftheisolatorturnedouttobeequalto1.5nm
Performance Evaluation of Frame-loss Error-concealment Solutions for the SHVC Standard
Thuc Nguyen Huu,Duong Dinh Trieu,Byeungwoo Jeon,Xiem HoangVan 대한전자공학회 2017 IEIE Transactions on Smart Processing & Computing Vol.6 No.6
Scalable High Efficiency Video Coding (SHVC) has been emerging as an efficient video coding solution for adaptive video streaming and conferencing. SHVC is designed with a layered coding structure in which High Efficiency Video Coding (HEVC) tools are employed as core elements. However, compression efficiency and error sensitivity associated with efficient HEVC tools make this scalable codec less attractive for practical video transmission, especially when the loss of packets or video frames occurs. This problem severely impacts the display quality of received video. To address this problem, we propose efficient error concealment (EC) methods that compensate for a whole frame that is lost and that mitigate the error propagation problem occurring in practical video transmissions using SHVC. The presented EC methods mainly rely on the decoded information; thus, it is easily integrated into the SHVC decoder as a post-processing component. The experimental results obtained for both subjective and objective quality assessments show that the inter-layer correlation-based EC approach typically provides the highest concealed frame quality; thus, it is highly recommended for practical video transmission.
Melvyn WB Zhang,Bach Xuan Tran,Huong Lan Thi Nguyen,Huong Thi Le,Nguyen Hoang Long,Huong Thi Le,Nguyen Duc Hinh,Tran Dinh Tho,Bao Nguyen Le,Vu Thi Minh Thuc,Chau Ngo,Nguyen Huu Tu,Carl A. Latkin,Roger 대한의료정보학회 2017 Healthcare Informatics Research Vol.23 No.2
Objectives: The average alcohol consumption per capita among Vietnamese adults has consistently increased. Although alcoholrelated disorders have been extensively studied, there is a paucity of research shedding light on this issue among Internet users. The study aimed to examine the severity of alcohol-related disorders and other associated factors that might predispose individuals towards alcohol usage in a sample of youths recruited online. Methods: An online cross-sectional study was conducted with 1,080 Vietnamese youths. A standardized questionnaire was used. Respondent-driven sampling was applied to recruit participants. Multivariate logistic and Tobit regressions were utilized to identify the associated factors. Results: About 59.5% of the males and 12.7% of the total youths declared that they were actively using alcohol. From the total sample, a cumulative total of 32.3% of the participants were drinking alcohol, with 21.8% and 25.0% of the participants being classified as drinking hazardously and binge drinkers, respectively. The majority of the participants (60.7%) were in the pre-contemplative stage. Conclusions: A high prevalence of hazardous drinking was recognized among online Vietnamese youths. In addition, we found relationships between alcohol use disorder and other addictive disorders, such as tobacco smoking and water-pipe usage. Our results highlighted that the majority of the individuals are not receptive to the idea of changing their alcohol habits, and this would imply that there ought to be more government effort towards the implementation of effective alcohol control policies.
Bui Quoc Dung,Cao Huu Tinh,Nguyen Cong Thuc,Do Manh Dan 제어로봇시스템학회 2021 제어로봇시스템학회 국제학술대회 논문집 Vol.2021 No.10
In this paper, we synthesize the sinusoidal biased proportional navigation guidance (PNG) law for enhancing the survivability of anti-ship missiles against the interception of anti-air missiles (AAM). The magnitude and frequency of the sinusoidal acceleration can be seen as trajectory design parameters of the guidance law. The closed-form solution of the command acceleration is found to show how the key parameters influence the performance of the guidance law. To evaluate the influence of trajectory design parameters as well as dynamics parameters on both the miss distance and the survivability of anti-ship missiles, we use the homing loop model which consists of the canonical fifth-order binomial dynamics and the proposed guidance law. The simulation is implemented in Matlab based on the homing model for drawing the miss distance curves of both anti-ship missiles and anti-air missiles. The simulation results show that the magnitude, frequency, and time constants greatly influence the miss distance and survivability of the anti-ship missiles (ASM). Finally, the suggestions for choosing suitable parameters are also presented.
Focal Stack Based Light Field Coding for Refocusing Applications
Vinh Van Duong,Thuong Nguyen Canh,Thuc Nguyen Huu,전병우 한국방송∙미디어공학회 2019 방송공학회논문지 Vol.24 No.7
Since light field (LF) image has huge data volume, it requires high-performance compression technique for efficient transmission and storage of its data. Camera users may like to represent parts of image at different levels of focus at their choice anytime. To address this refocusing functionality, in this paper, we first render a focal stack consisting of multi-focus images, then compress it instead of original LF data. The proposed method has advantage of minimizing the amount of LF data to realize the targeted refocusing applications. Our experiment results show that the proposed method outperforms the state-of-the-art for LF image compression method.