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Nguyen Xuan Truong 대한전자공학회 2008 ITC-CSCC :International Technical Conference on Ci Vol.2008 No.7
The SBC (subband coding) using the multirate filter bank was proposed in 1980, this coding method splits full audio spectrum into subbands, and assigns more bits to each subband with higher energy. If the power spectral density (PSD) of any subbands is approximately zero, then those subbands need not be assigned any bits at all. While reconstruction, the subband signals are synthesized to the original signal. The most important advantage of SBC is data reduction. The multirate filter bank (MFB) must obtain requirement of perfect reconstruction and requirement of maximal decimation. This paper proposed two new methods to find out sets of decimation ratios, and an optimal set is chosen for designing MFB, satisfying above requirements. Because the optimal set is suitable with PSD distribution of signal, the achieved result does not help only to decrease data rate but also to reduce total error on the reconstructed output signal. An example where an audio signal is the input signal is included.
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Karyotype and B chromosome variation in Lilium amabile Palibin
Truong Xuan Nguyen,김보람,박두리,김영규,Viet‑Yen Nguyen,나종국,김남수,김종화 한국유전학회 2019 Genes & Genomics Vol.41 No.6
Objective Lilium amabile Palibin (2n = 2x = 24) is an endemic lily species in Korea. B chromosomes are supernumerary chromosomes and the presence of B chromosome in L. amabile was known by previous researches. The current research was conducted to characterize the genetical and cytological features of the B chromosome plants in L. amabile. Methods Karyotype and B chromosome cytotype analyses were carried out among 135 L. amabile accessions that were collected from six geographical locations in Korea using conventional aceto-carmine staining as well as FISH technique with ribosomal RNA gene probes. Results The karyotype of L. amabile genome consisted of two large metacentric, four intermediate subtelocentric, and six intermediate to small acrocentric chromosomes in which chromosomes 1, 6 and 7 carried the 45S rRNA gene loci and chromosome 3 carried the 5S rRNA gene. There were 4 types of B chromosomes, two large B chromosomes and two small B chromosomes. The ribosomal RNA gene loci were not present in the B chromosomes. The 135 accessions were classified into 13 cytotypes including diploids and different B chromosome aneuploids. Among the aneuploids, the most frequent cytotype was 24 + 1B, which was followed by 24 + 2B, 24 + 1b, 24 + 1B + 2b, 24 + 1B + 4b, and 24 + 2B + 4b. Conclusion The karyotype of L. amabile was consistent with other species in the genus Lilium without polyploids. The B chromosome cytotypes were highly variable and the occurrences of different cytotypes were random among the six populations, implying that the B and b chromosome occurrence was random in each population.
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A New Dimeric Lignan from the Stems of Willughbeia edulis
Nguyen, Hai Xuan,Do, Truong Nhat Van,Le, Tho Huu,Dang, Phu Hoang,Nguyen, Mai Thanh Thi,Nguyen, Nhan Trung The Korean Society of Pharmacognosy 2022 Natural Product Sciences Vol.28 No.2
As part of our continued study on the chemical constituents of Willughbeia edulis stems, a new dimeric lignan named edulignan (1) was isolated from its EtOAc-soluble extract. Based on NMR spectroscopic interpretation, the planar structure of 1 has been suggested to have two 2-substituted 4-chromanone subunits with different stereochemical configurations. In addition, the MS/MS analysis of the products obtained by acid-catalyzed hydrolysis of 1 was supportive of its structure. Unfornatually, the new compound 1 did not show 𝛼-glucosidase inhibitory activity with an IC<sub>50</sub> value > 250 𝜇M.
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Factors That Influence the Intentions to Revisit Korea of Vietnamese Tourists
NGUYEN, Xuan Truong Korea Distribution Science Association 2020 The Journal of Asian Finance, Economics and Busine Vol.7 No.4
The study investigates the influences of different factors on revisit intention to Korea of Vietnamese tourists. A mixed-method including qualitative and quantitative methodologies were utilized. A focus group of 9 experts was carried out for reviewing and exploring different factors and the conceptual model. An in-depth interview with 19 participants was developed with an aim to develop and correct measurement items. The conceptual model was tested and developed using data collected by a questionnaire, from a sample of 473 respondents, who have visited Korea by both electronic and paper surveys with non-probability and convenience sampling techniques. The questionnaire in this research applied a 5-point Likert scale and was distributed both electronically using Google form and by questionnaire paper. The Bootstrap model was used for estimating the model parameters for retesting the reliability of the estimates. Factor analysis and Structural Equation Modelling are employed to analyze the data. Results showed that 427 tourists traveling by groups organized by travel companies and 46 tourists traveling on their own. The reliability, tangibility, empathy, and assurance had influences on tourists' intention to revisit a destination, especially through satisfaction mediating construct. Destination image, self-congruity, and the emergence of Hallyu had influences intension revisit through attitude and tourist motivation.
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Nguyen Hoang Loc,Truong Thi Phuong Lan,Nguyen Duc Huy,Nguyen Ngoc Luong,Hoang Tan Quang,Trinh Huu Tan,Le Thi Anh Thu,Nguyen Xuan Huy 한국식물생명공학회 2019 JOURNAL OF PLANT BIOTECHNOLOGY Vol.46 No.3
The aim of this study is to evaluate the effect of yeast extract (YE) and salicylic acid (SA) on the expression of curcuminoid-biosynthesis genes (CzDCS and CURS1-3), and accumulation of curcumin in Curcuma zedoaria cell cultures. The results showed that, in cells treated with YE or SA, the expression levels of curcuminoid genes were 1.14- to 3.64-fold higher than the control (untreated cells), in which the YE exhibited a stronger effect in comparison with SA. Curcumin accumulation also tended to be similar to gene expression, curcumin contents in YE- or SA-treated cells were 1.61- to 2.53-fold higher than the control. The SA treatment at the fifth day of culture stimulated the curcumin accumulation and expression in all four genes compared to that at the beginning. While the YE treatments gave different results, the CzCURS1 and CzCURS3 genes were expressed strongly in cells that were treated at the beginning. However, the CzDCS and CzCURS2 genes showed the opposite expression pattern, they were activated strongly in the treatments at day five of the culture. However, the content of curcumin reached its maximum value on the fifth day of culture in all investigations.
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Nguyen Xuan Truong 한국유통과학회 2018 The Journal of Asian Finance, Economics and Busine Vol.5 No.3
This study developed and tested the impact of hallyu 4.0, social media, and consumer ethnocentrism on the decision to purchase Korean products of Generation C in Vietnam. Both qualitative and quantitative methodologies were utilized in this study. Qualitative research was first carried out with in-depth interview, conducted to derive measurement items for the interested constructs. Quantitative research used cross-sectional field design by pilot study and official study. The model was tested and developed using data collected by questionnaires, from a sample of 575 respondents, by both electronic and paper surveys with non-probability and convenience sampling techniques. SPSS 20 and AMOS 20 software were employed to analyze the data. The results of structural equation modeling showed that hallyu 4.0, social media, and consumer ethnocentrism influenced the intermediates variables: subject norms, trust, attitude and behavioral intention and influenced purchase decision. The hallyu 4.0, social media, and consumer ethnocentrism are independent variables. They impact purchase decision through mediating variables such as trust, subjective norms, attitude and behavioral intention. Social media influences not only to trust but also to subjective norms. Subjective norms influence on purchase decision. This study also discovers an interesting fact that trust and attitude variables have an impact on behavioral intention and purchase decision.
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NGUYEN, Xuan Truong Korea Distribution Science Association 2020 The Journal of Asian Finance, Economics and Busine Vol.7 No.8
Entrepreneurship has become an important topic for governments to shape and influence the quantity and quality of entrepreneurship and improve policy toward the entrepreneurial economy. This study investigates the factors affecting the entrepreneurial decision of nascent entrepreneurs belonging to Generation Y in Vietnam. A mixed-method including both qualitative and quantitative methodologies was utilized. A focus group was carried out with 11 participants for exploring, reviewing, and testing content validity of constructs and measurement items. The conceptual model and hypotheses were developed using data collected by a questionnaire survey. The cross-sectional survey method was applied. A sample of 221 respondents was constituted, by both electronic and paper surveys with non-probability and convenience sampling techniques. SmartPLS 3 software was employed to analyze the data collected. The results show that nine factors were affecting the entrepreneurial decision of nascent entrepreneurs belonging to Generation Y in Vietnam, including entrepreneurial education, family background, entrepreneurial ecosystem, perceived behavioral control, social valuation, perceived opportunity, attitude, entrepreneurial self-efficacy, and entrepreneurial intention. The findings show the importance of entrepreneurial education, social value, and ecosystems. Therefore, in order to promote successful entrepreneurship, it is necessary to strengthen entrepreneurship education and have a strategy for the improvement of the entrepreneurship ecosystem.
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Interaction of TIF-90 and filamin A in the regulation of rRNA synthesis in leukemic cells
Nguyen, Le Xuan Truong,Chan, Steven M.,Ngo, Tri Duc,Raval, Aparna,Kim, Kyeong Kyu,Majeti, Ravindra,Mitchell, Beverly S. American Society of Hematology 2014 Blood Vol.124 No.4
<P>The transcription initiation factor I (TIF-IA) is an important regulator of the synthesis of ribosomal RNA (rRNA) through its facilitation of the recruitment of RNA polymerase I (Pol I) to the ribosomal DNA promoter. Activation of the phosphoinositide 3-kinase (PI3K)/protein kinase B (Akt) pathway, which occurs commonly in acute myelogenous leukemia, enhances rRNA synthesis through TIF-IA stabilization and phosphorylation. We have discovered that TIF-IA coexists with a splicing isoform, TIF-90, which is expressed preferentially in the nucleolus and at higher levels in proliferating and transformed hematopoietic cells. TIF-90 interacts directly with Pol I to increase rRNA synthesis as a consequence of Akt activation. Furthermore, TIF-90 binds preferentially to a 90-kDa cleavage product of the actin binding protein filamin A (FLNA) that inhibits rRNA synthesis. Increased expression of TIF-90 overcomes the inhibitory effect of this cleavage product and stimulates rRNA synthesis. Because activated Akt also reduces FLNA cleavage, these results indicate that activated Akt and TIF-90 function in parallel to increase rRNA synthesis and, as a consequence, cell proliferation in leukemic cells. These results provide evidence that the direct targeting of Akt would be an effective therapy in acute leukemias in which Akt is activated.</P>
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