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Thi-Hoan Luong,Dang-Minh-Chanh Nguyen,Thi-Nga Trinh,Viet-Cuong Han,Woo-Jin Jung 한국응용생명화학회 2022 Journal of Applied Biological Chemistry (J. Appl. Vol.65 No.4
In recent years, research into medicinal herbs with antioxidative activities has increased. Chrysanthemum morifolium and Chrysanthemum indicum are aromatic herb plants and that have long been used in traditional Vietnamese medicine. This study aims to evaluate the chemical compositions and antioxidative activities of essential oils hydrodistilled from the flower heads of C. morifolium and C. indicum. The chemical compositions of the essential oils were compared using gas chromatography/mass spectrometry (GC/MS) analysis. The antioxidative activity was determined and evaluated spectroscopically by the 2,2-diphenyl- 1-picrylhydrazyl (DPPH) radical scavenging, metal chelating activity, reducing power, and total antioxidant capacity assays. According to the GC/MS results, chrysanthenone was predominant in the essential oils of both C. morifolium (64.14%) and C. indicum (32.02%). This is the first report of the identification of chrysanthenone as a major constituent of the essential oil of C. morifolium. Both Chrysanthemum oils were also revealed to possess antioxidant potential, exhibiting high antioxidative activities. In particular, the DPPH radical scavenging activities of the C. morifolium and C. indicum oils at a concentration of 100 mg/mL were 76.9 and 83.2%, respectively. The metal chelating values of C. morifolium and C. indicum were 0.85 and 0.76, whereas the reducing power values of that at 100 mg/mL were 0.76 and 0.71, respectively. This study provides the chemical properties of the essential oils of both C. morifolium and C. indicum grown in Vietnam and their potential antioxidant capacity
Correlation of tree ring growths of four major species with climate changes in South Korea
Thi-Hoan Luong,이계한,장경수,임형우,최우정 한국산림과학회 2013 Forest Science And Technology Vol.9 No.4
Annual tree rings of Pinus densiflora, Quercus variabilis, Larix leptolepis, and Cryptomeria japonica were analyzed toexamine the correlations of annual ring growth of these species with environmental variables. In all four species, annualring area was increased over time and affected by integration of climate changes and atmospheric pollutants in the forestecosystem. C. japonica ring growth was larger than that of other species. The annual growth rings of P. densiflora andC. japonica increased with increasing temperature (p < 0.05). The significant impacts of NO2 concentration on annual ringgrowth of C. japonica (p < 0.05) might reflect the nitrogen deposition. The relation of CO2 concentration with annual ringgrowth of C. japonica (p < 0.001) could suggest that annual ring growth of C. japonica decreased with increasing CO2concentration, probably due to stomatal closure. The effects of SO2 concentration on annual ring area of P. densiflora,L. leptolepis, and C. japonica (p < 0.05) along with the correlation of O3 concentration with ring growth of P. densiflora(p < 0.05) could be due to acid deposition. The relationships of precipitation pH with annual ring growth of P. densiflora (p< 0.05) and Q. variabilis (p < 0.01) might reflect the change of nutrient cycles in the forest ecosystem. Therefore, annualring growths of four tree species depended on environmental factors in the study area. Integrated effects of climate changeand atmosphere pollutants on tree growth in the study might reflect the problem of acidification in the forest ecosystem.
The Influence of Competitive Advantage on Financial Performance: A Case Study of SMEs in Vietnam
Hoan NGUYEN,Thi Hoang Mai TRAN,Thi Hai Yen NGUYEN,Duc Dinh TRUONG 한국유통과학회 2021 The Journal of Asian Finance, Economics and Busine Vol.8 No.5
Profit generation is one of the main goals of small- and medium-sized enterprises (SMEs). SMEs have deployed a number of solutions to increase profits, including solutions to improve their financial advantage. The question is how to help SMEs make better and more effective decisions to improve their competitive advantage in order to improve their financial performance. The aim of this research is to examine the impact of competitive advantage on financial performance in small- and medium-sized enterprises (SMEs) in Hanoi. A survey of 120 accountants, sales staff and boards of directors of SMEs was conducted to collect data. Through quantity methodology, we used Cronbach’s Alpha, EFA and correlation analysis to determine the relationship between competitive advantage and dependent variable – financial performance. The results showed that the competitive advantage had a positive relationship with financial performance. There is not, statistically, significant difference in the level of financial performance in SMEs in Hanoi in terms of genders and between the mentioned three groups of job descriptions. From the findings, this study suggests several recommendations to improve financial performance such as increase sales and increase profits. The results are considered as a useful reference for establishing policies to attract customers toward sustainable development of firms.
Thi-Hoan Luong,이계한,장경수,최우정 한국생태학회 2013 Journal of Ecology and Environment Vol.36 No.1
Annual ring formation is considered a source of information to investigate the effects of environmental changes caused by temperature, air pollution, and acid rain on tree growth. A comparative investigation of annual ring growth of Cryptomeria japonica in relation to environmental changes was conducted at two sites in southern Korea (Haenam and Jangseong). Three wood disks from each site were collected from stems at breast height and annual ring growth was analyzed. Annual ring area at two sites increased over time (p > 0.05). Tree ring growth rate in Jangseong was higher than that in Haenam. Annual ring area increment in Jangseong was more strongly correlated with environmental variables than that in Haenam; annual ring growth increased with increasing temperature (p < 0.01) and a positive effect of NO2 concentration on annual ring area (p < 0.05) could be attributed to nitrogen deposition in Jangseong. The correlation of annual ring growth increased with decreasing SO2 and CO2 concentrations (p < 0.01) in Jangseong. Variation in annual growth rings in Jangseong could be associated with temperature changes and N deposition. In Haenam, annual ring growth was correlated with SO2 concentration (p < 0.01), and there was a negative relationship between precipitation pH and annual ring area (p < 0.01) which may reflect changes in nutrient cycles due to the acid rain. Therefore, the combined effects of increased CO2, N deposition, and temperature on tree ring growth in Jangseong may be linked to soil acidification in this forest ecosystem. The interactions between air pollution (SO2) and precipitation pH in Haenam may affect tree growth and may change nutrient cycles in this site. These results suggested that annual tree ring growth in Jangseong was more correlated with environmental variables than that in Haenam. However, the further growth of C. japonica forest at two sites is at risk from the long-term effects of acid deposition from fossil fuel combustion.
NGUYEN, Hoan,NGO, Thi Kieu Trang,LE, Thi Tam Korea Distribution Science Association 2020 The Journal of Asian Finance, Economics and Busine Vol.7 No.3
The purpose of this study is to investigate factors influencing risk assessment of material misstatement in Vietnamese enterprises listed on stock market. Expert interview method was conducted to discover the scales for three variables including information system, trademark, and risk assessment of material misstatement. Survey method was used to examine the impacts of eight factors on risk assessment of material misstatement. Data is collected from 317 auditors who have excellent experience in auditing financial statements of companies listed on stock market. Then, data is processed by descriptive statistics, reliability analysis, factor extracted analysis, correlative regression analysis, and analysis variance of residual change. The research findings showed that business characteristic, stakeholder pressure, and economic environment have positive relationships with risk assessment of material misstatement. Three variables including operation control and monitor, control environment, and information system negatively affect to risk assessment. Specially, business characteristic and information system, which are elements in internal control, have strongest impact on risk assessment. One the other hand, assessment of internal control plays an important role not only in the audit plan stage but also throughout the stages of the audit implementation and ending. Therefore, appropriate solutions are proposed to carry out all audit stages.
Luong, Thi-Hoan,Jang, Kyoung-Soo,Choi, Woo-Jung,Lee, Kye-Han The Ecological Society of Korea 2013 Journal of Ecology and Environment Vol.36 No.1
Annual ring formation is considered a source of information to investigate the effects of environmental changes caused by temperature, air pollution, and acid rain on tree growth. A comparative investigation of annual ring growth of Cryptomeria japonica in relation to environmental changes was conducted at two sites in southern Korea (Haenam and Jangseong). Three wood disks from each site were collected from stems at breast height and annual ring growth was analyzed. Annual ring area at two sites increased over time (p > 0.05). Tree ring growth rate in Jangseong was higher than that in Haenam. Annual ring area increment in Jangseong was more strongly correlated with environmental variables than that in Haenam; annual ring growth increased with increasing temperature (p < 0.01) and a positive effect of $NO_2$ concentration on annual ring area (p < 0.05) could be attributed to nitrogen deposition in Jangseong. The correlation of annual ring growth increased with decreasing $SO_2$ and $CO_2$ concentrations (p < 0.01) in Jangseong. Variation in annual growth rings in Jangseong could be associated with temperature changes and N deposition. In Haenam, annual ring growth was correlated with $SO_2$ concentration (p < 0.01), and there was a negative relationship between precipitation pH and annual ring area (p < 0.01) which may reflect changes in nutrient cycles due to the acid rain. Therefore, the combined effects of increased $CO_2$, N deposition, and temperature on tree ring growth in Jangseong may be linked to soil acidification in this forest ecosystem. The interactions between air pollution ($SO_2$) and precipitation pH in Haenam may affect tree growth and may change nutrient cycles in this site. These results suggested that annual tree ring growth in Jangseong was more correlated with environmental variables than that in Haenam. However, the further growth of C. japonica forest at two sites is at risk from the long-term effects of acid deposition from fossil fuel combustion.