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Multi-Carrier Differential Chaos-Shift Keying with Repeated Spreading Sequence
Quyen, Nguyen Xuan The Korean Institute of Communications and Informa 2018 Journal of communications and networks Vol.20 No.3
This paper proposes a multi-carrier differential chaos-shift keying (MC-DCSK) system using repeated spreading sequence (RSS), namely RSS-MC-DCSK, for chaos-based wireless communications. In the proposed system, instead of transmitting the chaotic spreading sequence on a predefined subcarrier as in conventional MC-DCSK, a DCSK-modulated signal, of which each two-bit duration consisting of reference and data-bearing sequences is sent via this subcarrier. Meanwhile, a repeated spreading sequence is produced by copying the reference sequence of the DCSK-modulated signal to the same and next bit periods. The parallel bit streams are multiplied with this RSS and the resulting signals are then conveyed by corresponding subcarriers. In the receiver, the signal retrieved from the predefined subcarrier is DCSK-demodulated and simultaneously used to recover the repeated spreading sequence. The correlative demodulation is performed for all the signals retrieved from the remaining subcarriers to decode the data. The structure and operation of the proposed system are described. Bit error rate (BER) performance under a multipath Rayleigh fading channel is theoretically analyzed and then verified by numerical simulations. In addition, the BER performance, energy and spectral efficiencies of RSS-MC-DCSK are evaluated in comparison to those of MC-DCSK.
A simple time-to-event model with NONMEM featuring right-censoring
Quyen Thi Tran,Jung-woo Chae,Kyun-Seop Bae,Hwi-yeol Yun 대한임상약리학회 2022 Translational and Clinical Pharmacology Vol.30 No.2
In healthcare situations, time-to-event (TTE) data are common outcomes. A parametricapproach is ofen employed to handle TTE data because it is possible to easily visualizediferent scenarios via simulation. Not all pharmacometricians are familiar with the use ofnon-linear mixed efects models (NONMEMs) to deal with TTE data. Therefore, this tutorial simply explains how to analyze TTE data using NONMEM. We show how to write the codeand evaluate the model. We also provide an example of a hands-on model for training.
Production of transgenic soybean plants carrying modified cry1Ac gene
Quyen Nguyen Thi,Jung Hun Pak,Mi-Jin Kim,Hye Jeong Kim,Ha Neui Hong,Yeon Ho Je,Young Soo Chung 한국육종학회 2012 한국육종학회 심포지엄 Vol.2012 No.07
Cry1Ac protein is known as one of toxin crystal proteins synthesized from Bacillus thuringenesis that plays a critical role for the insect resistance. Recently, cry1Ac genes have introduced into many plants in general and soybean as well. However, the gene expression of cry1Ac genes in transgenic plants remains low that need to be improved. Several mutations we reintroduced into the cry1Ac genes in order to enhance the insecticidal effect. In this study, the cry1Ac with mutant #2, #11 and #16 were transformed into Kwangan, a Korean soybean variety by using the “half-seed” method. The plant lets carrying modified cry1Ac genes were primarily selected on media containing Phosphinothricine (PPT), a bar selective agent and Basta leaf painting. Then, the presence of introduced genes in T0 plants and the gene expression were investigated by PCR, RT-PCR and Real-time PCR. PCR and RT-PCR analysis showed expression of bar and cry1Ac genes from tested transgenic soybean plants. The number of copy of bar gene ranged from 1 to 3 by Real-time PCR analysis. These results provided a fundamental back ground for our further experiments: Confirmation of the gene expression by Southern blot and identification of the function of modified cry1Ac by insect bioessays.
The Role of Semantic Features on the L2 Acquisition of English Articles
Quyen Nguyen 한국중원언어학회 2017 언어학연구 Vol.0 No.45
This study examines the role of semantic features associated with the English article system, namely presuppositionality and specificity, in the acquisition of English articles by Vietnamese L2 learners. Specifically, the study aims to determine whether the Vietnamese L2 learners of English overuse the with specific indefinites and presuppositional indefinites and how the overuse changes depending on contexts and the learners’ proficiency level. Using a forced choice elicitation task, the study has yielded two significant contributions. Firstly, it was found that the learners were affected by both semantic factors as manifested in the overusing of the with specific and presuppositional indefinites. Secondly, the effects of two factors were not equal, with presuppositionality having a stronger and more persistent effect than specificity in triggering article misuses. From the findings, it was suggested that instead of associating the with definiteness, L2 learners often mistakenly associate the with specificity and presuppositionality. Such findings put forward some important pedagogical implications for L2 learners and instructors as well.
Viscous heating and temperature profiles of liquid water flows in copper nanochannel
Quyen Van Dinh,Truong Quoc Vo,김보흥 대한기계학회 2019 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.33 No.7
Understanding nanoscale fluidic transport becomes increasingly important due to the rapid development of nanotechnology and nanofabrication. By using molecular dynamics (MD) simulations, we investigated the viscous heating of water flows in copper nanochannels. The two scenarios that were studied are Couette flows and Poiseuille flows. We observed the scale effects on the distribution of fluid density, streaming velocity, fluid viscosity, and temperature across the channel. The results revealed the significant effects of surface forces on causing a large deviation between simulation results and classical hypothesis. We found that the energy equation coupled with the thermal-slip boundary conditions still fails to predict the temperature distributions. Hereby, further scale effects are taken into account, which leads to better predictions. The model that we developed in this study shows the relative deviation to the simulation data within 5 %, which is small compared to the conventional continuum approach (i.e., up to 51 %).
Quyen Thi Tran, Jung-woo Chae 忠南大學校 醫藥品開發硏究所 2021 藥學論文集 Vol.36 No.-
Clevudine (CLV) and entecavir (ETV) were approved in Korea in 2006. While ETV is recommended as first-line monotherapies for treatment chronic hepatitis B in many countries, the application of CLV is limited in Korea and Philippine due to concern about CLV-induced myopathy. Our meta-analysis study was performed to compare the efficacy and safety of CLV to ETV based on literature reviews. Electronic databases were searched and four studies with a total of 697 patients were included in our study. Results showed that virological re- sponse at 48 weeks of treatment was not significantly different between CLV and ETV (RR: 1.05, 95% CI: 0.96-1.14, I2 = 0%). The result for alanine aminotransferase normalization rate (RR: 1.05, 95% CI: 0.96-1.14, I2 = 0%) and serological response (RR: 0.59, 95% CI: 0.27-1.29, I2 = 57%) also showed a similar between CLV and ETV. The results at 24 weeks showed no statistically significant difference between CLV and ETV as well. These results suggest that CLV may have similar efficacy as ETV.