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Minh-Huy Dinh Dang,Linh Ho Thuy Nguyen,Trang Thi Thu Nguyen,Ngoc Xuan Dat Mai,Phuong Hoang Tran,Tan Le Hoang Doan 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.103 No.-
Functionalized metal–organic frameworks have recently received significant attention in heterogeneouscatalysis applications due to their high catalytic activity. In this work, a sulfate-functionalized Hf-clusterbasedmetal–organic framework was prepared via sulfation of a Hf-MOF, named Hf-BTC, constructed byHf6 clusters and 1,3,5-tricarboxylate linkers. The Hf-BTC-SO4 material was consequently demonstrated tobe an efficiently reusable superacid catalyst for a one-pot three-component reaction of pyrimido[1,2-a]benzimidazoles synthesis. The reaction catalyzed by the sulfated Hf-BTC could be carried out under mildand solvent-free conditions and give superior performance in a wide range of substrates. According todetailed investigation, the good catalytic performance of the sulfated-functionalized MOF likely originatesfrom the high-porosity framework and the high active sites of the functionalized clusters. Importantly, the catalyst could be easy to recover and reuse the functionalized framework several timeswith minor changes in catalytic efficiency.
Two Lagrange Optimization Theory Based Methods for Solving Economic Load Dispatch Problems
Nguyen Dao,Nguyen Thuy Linh,Tran Hoang Quang Minh,Nguyen Trung Thang 보안공학연구지원센터 2015 International Journal of Hybrid Information Techno Vol.8 No.5
The optimal generation dispatch problem with only one fuel option for each generating unit has been solved for many recent years. However, it is more realistic to represent the fuel cost function for each fossil fired plant as a segmented piece-wise quadratic functions. This is because of development of technology in thermal plants to reach maximum fuel save. Those units are faced with the difficulty of determining which the most economical fuel to burn is. This paper presents two effective methods for solving economic load dispatch problem with multiple fuel options. An advantage of the methods is to formulate Lagrange mathematical function easily based on the Lagrange multiplier theory. The proposed methods are tested on one test system consisting of ten generating units with various load demands and compared to other methods. The simulation results show that the methods are very efficient for the optimal generation dispatch problem with multiple fuel options
Determinants Influencing Information Transparency in Vietnamese Commercial Banks
NGUYEN, Minh Phuong,NGUYEN, Thi Hong Hai,HOANG, Phuong Dung,TRAN, Manh Dung,PHAM, Quang Trung Korea Distribution Science Association 2020 The Journal of Asian Finance, Economics and Busine Vol.7 No.12
Information transparency ensures that market players all have the opportunity to access the same information to come up with their assessment of the banks' financial situation, performance and risks to reach effective investment decisions. This research is conducted to investigate the levels of impact of determinants on information transparency by examining the case studies of Vietnamese commercial banks. This study combines both qualitative and quantitative research methods, based on interviews of 32 specialists in banking, accounting and auditing fields, which were conducted to explore determinants influencing information transparency and to develop measurement scales. Then, a survey of 160 managers of commercial banks, audit firms, and accounting managers of firms who frequently had transactions with banks was carried out to investigate the statistical significance of these determinants. The results show that, out of seven determinants that have significant impacts on the banks' information transparency, commitment from banks' senior management regarding transparency in information disclosure has the highest impact, followed by state governance, auditing, information infrastructure, credit rating agencies, personnel and bank performance. Accordingly, we provide some recommendations for improving information transparency in the Vietnamese banking industry context as a case study and in emerging countries context in general.
HOANG, Thi Thuy,HOANG, Lien Thi,PHI, Thi KimThu,NGUYEN, Minh Thu,PHAN, Minh Quang Korea Distribution Science Association 2020 The Journal of Asian Finance, Economics and Busine Vol.7 No.10
This objective of this study is to enrich the literature by the debt ratio and enterprise performance of Joint stock companies of Vietnam National Coal and Mineral Industries Holding Corporation Limited (Vinacomin). The debt ratio is an important index of capital structure, and it influences and decides the enterprise performance. Therefore, the determination of reasonable debt ratio level is beneficial to the stable operation of Vinacomin's enterprises. Based on the research conclusion about the effect on capital structure of debt ratio from domestic and foreign scholar, collecting data from 2014-2018 of Vinacomin's enterprises as a research sample, the article conducts research on the relationship between debt ratio and business performance of Vinacomin, as measured by return on total Assets. In addition, the study uses free cash flow, company size, growth opportunity, investment opportunities, operating costs to sales ratio as control variables.The study shows the debt ratio of Joint stock companies of Vietnam National Coal and Mineral Industries Holding Corporation Limited has a negative effect on the enterprise performance. Furthermore, the research results of the article are references for Vinacomin' enterprises in the course of production and business activities, determining a reasonable debt ratio, and improving the operational performance of enterprises.
The complete chloroplast genome of Syzygium polyanthum (Wight) Walp. (Myrtales: Myrtaceae)
Hoang Danh Nguyen,Minh Thiet Vu,Hoang Dang Khoa Do 국립중앙과학관 2023 Journal of Asia-Pacific Biodiversity Vol.16 No.2
Syzygium polyanthum (Wight) Walp. is a common herbal medicine and food ingredient in South EastAsia. In this work, the chloroplast genome of S. polyanthum was sequenced and characterized using anext-generation sequencing method. The results revealed a quadripartite chloroplast genome of158,535 bp in length, including a large single-copy region, a small single-copy region, and two invertedrepeat regions of 87,759 bp, 18,708 bp, and 26,034 bp in size, respectively. This genome contained 124genes (with 17 duplicated genes in inverted repeat regions), including 79 protein-coding genes, eightribosomal RNAs, and 37 transfer RNAs. Based on the chloroplast genomes of 47 Myrtaceae species, aphylogenetic analysis revealed that the Syzygium genus was divided into three clades, in whichS. polyanthum was a sister to a clade formed by S. malaccense, S. samarangense, S. aromaticum, S. rehderrianum, and S. nervosum. This study reports the first record of a complete chloroplast ofS. polyanthum that provides useful genetic information for further studies on taxonomy, genomicstructural variation, and the evolution of Syzygium as well as the Myrtaceae family.
Nguyen Quang Minh,La Phu Hien,Nguyen, Thi Thu Huong,Hoang, Ngoc Ha 한국측량학회 2023 한국측량학회지 Vol.41 No.5
In this paper, a new approach for the improvement of accuracy in DEMs (Digital Elevation Models) was proposed. While algorithms such as bilinear, bicubic, Kriging, and the HNN (Hopfield neural network) model can enhance the accuracy of DEMs, especially those derived from global data sources such as SRTM, ASTER, etc., the inclusion of additional elevation data can further improve the accuracy of the DEM. In this paper, a newly proposed resolution enhancing HNN model with the incorporation of elevation adjustment functions and variations in constraint conditions was developed and evaluated. The evaluation of the model was mplemented in Cao Bang using SRTM 30m DEM data in a 1650m × 1344m area, with 130 elevation points used for accuracy enhancement and 64 points used for evaluation. The test results show an increase in accuracy of up to 40% in terms of both roots mean square error and mean absolute error when the additional elevation points were used. It has also been discovered that a zoom factor of 4 provides the best optimization in terms of balancing accuracy and computing cost for the newly proposed HNN downscaling algorithm. The results indicate that the model has the potential to be applied in practice to enhance the accuracy of DEMs, especially global DEMs after additional evaluation.