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Thanh-Tuyen Tran,Le Minh Triet,Nhu-Ty NGUYEN 대한산업공학회 2023 Industrial Engineeering & Management Systems Vol.22 No.3
Travel and tourism are performing significant important roles in Vietnam, this industry has gradually been a critical sector of the economy. As a result, understanding the ability to perform of firms in this industry helps to ensure the sustainable growth of Vietnamese travel and tourism industry. In this study, the researcher suggests a combined method including a grey model (GM) and a Malmquist productivity index (MPI) to evaluate the abilities to perform of travel and tourism Vietnamese for some past periods. After gathering the data for 14 Vietnamese travel and tour-ism firms over the four-year period of 2015–2018, the research applies GM to estimate values of selected input and output factors for the 14 Vietnamese travel and tourism firms in two next years 2019 and 2020. Then, one MPI model is employed to evaluate the performance of those firms in past years and next two years from forecasted val-ues by GM. The MPI indexes reveal several firms will get higher efficiency, while others will get lower efficiency in the future. This integrated numerical research provides past–present–future insights for decision-makers to maintain sus-tainable development of travel and tourism industry in Vietnam by performance analysis.
Tran Thien khanh,Ha Pham Thi Thu,Henry Robert. J.,Nguyen Dang Nguyen Thao,Tuyen Phung Thi,Liem Nguyen Thanh 한국미생물·생명공학회 2024 Journal of microbiology and biotechnology Vol.34 No.1
Plants contain a large number of phytochemical components, many of which are known as bioactive compounds and responsible for the expression of various pharmacological activities. The extract of Sonneratia caseolaris fruit collected in Vietnam was investigated for its total phenolic and total flavonoid contents using methanol solvent and different fractions of S. caseolaris fruits (hexane, ethyl acetate, n-butanol, and aqueous). GC–MS analysis was conducted to identify the bioactive chemical constituents occurring in the active extract. Further, the antibacterial activity was tested in vitro on bacterial isolates, namely Escherichia coli, Staphylococcus aureus, and Bacillus subtilis, using the disc diffusion method on tryptic soya agar (TSA) medium. The methanol extract showed high total flavonoid (82.3 ± 0.41 mg QE/g extract) and phenolic (41.0 ± 0.34 mg GAE/g extract) content. GC–MS of the methanol extract and different fractions of S. caseolaris fruits detected 20 compounds, principally fatty alcohols, fatty acids, phenols, lipids, terpenes derivatives, and carboxylic acids derivatives. A 50 mg/ml concentration of methanol extract had the strongest antibacterial activity on E. coli, S. aureus, and B. subtilis. Furthermore, ethyl acetate, aqueous, and n-butanol fractions inhibited S. aureus and B. subtilis the most. The results of the present study suggested that the fruits of S. caseolaris are rich sources of phenolic compounds that can contribute to safe and cost-effective treatments.
Tran, Van Cuong,Nguyen, Ngoc Thanh,Fujita, Hamido,Hoang, Dinh Tuyen,Hwang, Dosam Elsevier 2017 Knowledge-based systems Vol.132 No.-
<P><B>Abstract</B></P> <P>In recent years, many applications in natural language processing (NLP) have been developed using the machine learning approach. Annotating data is an important task in applying machine learning to NLP applications. A common approach to improve the system performance is to train on a large and high-quality set of training data that is annotated by experts. Besides, active learning (AL) and self-learning can be utilized to reduce the annotation costs. The self-learning method discovers highly reliable instances based on a trained classifier, while AL queries the most informative instances based on active query algorithms. This paper proposes a method that combines AL and self-learning to reduce the labeling effort for the named entity recognition task from tweet streams by using both machine-labeled and manually-labeled data. We employ AL queries based on the diversity of the context and content of instances to select the most informative instances. The conditional random fields are also chosen as an underlying model to train a classifier for selecting highly reliable instances. The experiments using Twitter data show that the proposed method achieves good results in reducing the human labeling effort, and it can significantly improve the performance of the systems.</P>
Synthesis and iNOS Inhibitory Activities of Thioflavones
Tran Thanh Dao,Truong Ngoc Tuyen,Haeil Park 대한약학회 2005 Archives of Pharmacal Research Vol.28 No.6
A number of thioflavones has been synthesized and evaluated for their iNOS inhibitory activities. Thiowogonin (6) was obtained from naturally occurring chrysin in 5 steps. Other thioflavones were prepared from the corresponding flavones in a single step by the reaction with Lawesson’s reagent. The biological activities of thioflavones were not enhanced by the functional group conversion from carbonyl to thiocarbonyl. Compounds 11 and 13 showed potent NO inhibitory activity at high concentration (40 uM), leading to the possible development of novel neuroprotective agents based on wogonin.
Effects of pretreatment and air drying temperature on Noni fruit powder
Tuyen Chan Kha,Cong Thanh Nguyen,Luyen Thi Tran,Trung Tan Truong 한국식품과학회 2021 Food Science and Biotechnology Vol.30 No.12
The plant Morinda citrifolia L. (Noni) has beenthe subject of several recent research due to its positiveimpact on the treatment and prevention of a variety ofdiseases. Noni fruits contain a variety of phytochemicals,including flavonoid, polyphenol, and triterpenoid saponin. This study aimed to determine the best pre-treatment (includingblanching, soaking in ascorbic acid solution andmetabisulfite solution) and air-drying temperature (50, 60,70, and 80 C) to maximize the total polyphenol content(TPC), flavonoid content (TFC), and triterpenoid saponincontents (TSC) of the resultant Noni fruit powder. Theresults revealed that pre-soaked Noni fruit samples inascorbic acid or metabisulfite solution before air-drying at60 C were beneficial in preserving TPC, TFC, and TSC. TPC, TFC, and TSC losses increased as drying temperatures(70 and 80 C) rose. The optimum sample was held atfive different relative humidity conditions until theyattained weight equilibrium. The results indicated that thesorption isotherm curve of the Noni powder was the sigmoidshape and fitted with the BET and GAB models.
Artocarpus nigrifolius: Cytotoxic and Antibacterial Constituents
Tran Minh Hoi,김영호,Ha Van Anh,Nguyen Thi Thanh Huong,Nguyen Van Tuyen,Le Thi Tu Anh,Nguyen Thanh Tra,Ba Thi Cham,Nguyen Thi Thu Ha,Pham Thuy Linh,Doan Duy Tien,Phan Van Kiem,Ninh Khac Ban,Lidziya Kukha 한국응용생명화학회 2013 Applied Biological Chemistry (Appl Biol Chem) Vol.56 No.6
Six known compounds including α-amyrin 3-acetate (1), β-sitosterol (2), betulinic acid (3), friedelan-3-one (4),artochamin B (5), and 2-C-methyl-D-erythritol 4-O-α-D-glucopyranoside (6) were isolated from the stem barks and leaves of Artocarpus nigrifolius (Moraceae) for the first time. Their structures were identified by spectroscopic methods as well as comparison with literatures. Cytotoxicity and antibacterial activity of 1-6 were evaluated. Results showed that artochamin B (5)possessed the highest cytotoxicity towards MCF7, Lu, HepG2,and KB cell lines with IC50 values of 4.59, 20.00, 3.60, and 1.18μg/mL, respectively. It also inhibited the growth of Gram-positive bacteria (Bacillus subtilis, Staphylococcus aureus), whereas inactive on the growth of both Gram-negative bacteria and yeast.
Artocarpus nigrifolius: Cytotoxic and Antibacterial Constituents
Hoi, Tran Minh,Anh, Ha Van,Huong, Nguyen Thi Thanh,Tuyen, Nguyen Van,Anh, Le Thi Tu,Tra, Nguyen Thanh,Cham, Ba Thi,Ha, Nguyen Thi Thu,Linh, Pham Thuy,Tien, Doan Duy,Kiem, Phan Van,Ban, Ninh Khac,Kukha The Korean Society for Applied Biological Chemistr 2013 Applied Biological Chemistry (Appl Biol Chem) Vol.56 No.6
Six known compounds including ${\alpha}$-amyrin 3-acetate (1), ${\beta}$-sitosterol (2), betulinic acid (3), friedelan-3-one (4), artochamin B (5), and 2-C-methyl-D-erythritol 4-O-${\alpha}$-D-glucopyranoside (6) were isolated from the stem barks and leaves of Artocarpus nigrifolius (Moraceae) for the first time. Their structures were identified by spectroscopic methods as well as comparison with literatures. Cytotoxicity and antibacterial activity of 1-6 were evaluated. Results showed that artochamin B (5) possessed the highest cytotoxicity towards MCF7, Lu, HepG2, and KB cell lines with $IC_{50}$ values of 4.59, 20.00, 3.60, and $1.18{\mu}g/mL$, respectively. It also inhibited the growth of Gram-positive bacteria (Bacillus subtilis, Staphylococcus aureus), whereas inactive on the growth of both Gram-negative bacteria and yeast.
Vinh-Thanh Tran,Duc-Tri Do,Minh-Khai Nguyen,Dinh-Tuyen Nguyen 전력전자학회 2019 ICPE(ISPE)논문집 Vol.2019 No.5
In this paper, a space vector pulse-width modulation (SVPWM) control scheme for the three-level quasi-switched boost T-type inverter (TL-qSBT2I) to reduce common mode is presented. The magnitude and slew rate of common-mode voltage (CMV) are reduced by using the proposed method. By properly selecting the shoot-through (ST) phase, the ST states are inserted within a small vector so that the active states and output voltage are unchanged. In this method, the ST duty cycle is kept constant to obtain the modulation index as high as possible while the duty cycles of the two additional switches are the control variables. The proposed method can mitigate the peak value of CMV up to 50% and the RMS value up to 35.3% as compared to the conventional SVPWM control method. To verify the operating principle of the TL-qSBT<SUP>2</SUP>I, the simulation and experimental results are shown.
Synthesis and iNOS Inhibitory Activities of Thioflavones
Dao Tran Thanh,Tuyen Truong Ngoc,Park Haeil The Pharmaceutical Society of Korea 2005 Archives of Pharmacal Research Vol.28 No.6
A number of thioflavones has been synthesized and evaluated for their iNOS inhibitory activities. Thiowogonin (6) was obtained from naturally occurring chrysin in 5 steps. Other thioflavones were prepared from the corresponding flavones in a single step by the reaction with Lawesson's reagent. The biological activities of thioflavones were not enhanced by the functional group conversion from carbonyl to thiocarbonyl. Compounds 11 and 13 showed potent. NO inhibitory activity at high concentration (40 uM), leading to the possible development of novel neuroprotective agents based on wogonin.