TABLE TENNIS MOVEMENT AMONG OFFICIALS AND EMPLOYEES AT SAIGON UNIVERSITY, VIETNAM

Research using the method of synthesis, document analysis and interview has identified six criteria through which the evaluation application provides accurate and comprehensive information about the table tennis movements among officials and employees at Saigon University. In addition, the article also provided information on the form, organization method, time, number of training sessions, time and location, training costs of officials, employees, lecturers and table tennis coaches. The research results are a reference for managers, contributing to the development of the sport movement among officials and employees at Saigon University.  Article visualizations

Policy of mobilizing financial resources for developing new countryside in Vietnam

Financial resources and the institutional framework, as well as policies for mobilizing financial resources, are important issues that need to be addressed in the construction of new countryside in Vietnam. Financial resources for the new countryside mainly come from the state budget, credit sources, investments from enterprises, contributions, and support from organizations, individuals, and the local community. In recent years, the state has paid attention to financial investment and issued policies to mobilize financial resources for the new countryside. Through these policies, Vietnam's rural areas have achieved important results, with rural areas being renewed, the economy being developed, and the living standards of the people being improved. However, statistical analysis and research results show that, alongside the achievements, financial resources for new countryside have not yet satisfied the needs, and the policies for mobilizing resources are sluggish to innovate and have neither fully exploited the potential of rural areas nor effectively mobilized resources from the state and society. The state budget resources for investing in the new countryside are limited, and the investment resources from enterprises have yielded low results. Contributions from the people and the local community are voluntary and have not become the main resources mobilized for the new countryside. Based on the research results, the author proposes some solutions to improve the policies for mobilizing financial resources for the new countryside in Vietnam

Research on Digital Marketing for Play Nutrition's Nutrition Bar

In the 4.0 context, Digital Marketing becomes suitable for all businesses, from small to medium to large, helping businesses reduce costs, increase the effectiveness of communication tools, and align with today's digital transformation context. The study examines the degree of application of Digital Marketing tools for the Play Nutrition bar. The results show that “Content Marketing” has the highest frequency of appearance, attractiveness, and influence. Along with “Content Marketing”, “Video Marketing” also has the strongest impact. Based on the theoretical study of Digital Marketing, combined with survey results and orientation toward the use of Digital Marketing tools in the future for Play Nutrition bars, the research team proposes some recommendations to enhance the effectiveness of using Digital Marketing tools for Play Nutrition bars

Climatological Characteristics of Tropical Cyclone Rainfall in Vietnam

The tropical cyclones (TCs) are one of the most destructive atmospheric phenomena, bringing dangers such as disastrously heavy rainfall and flooding. Vietnam is one of the countries strongly affected by the TCs which are originated within the South China Sea (SCS) or coming from the western North Pacific (WNP). The features of rainfall associated with TCs have not been fully understood in Vietnam, as well as its role to the climatic variation. The main objectives of this study which aims to explore are: 1. The climatological characteristics of the TC rainfall in Vietnam from 1961-2008. 2. Long-term trends in TC rainfall over Vietnam region from 1961-2008. 3. An insight view of TC-induced rainfall in Central Vietnam. First, the characteristics of the climatological seasonal TC rainfall in Vietnam, including the amount, the TC rainfall ratio, and heavy rainfall events (TC_R50) were explored. The results show the distribution of TC rainfall, TC rain ratio, and the ratio of heavy rain days varies spatially and temporally. The TC rainfall amount in the central region is higher than that in other regions, with a peak in October-November. The northern region has maximum TC rainfall from July to September, whereas the total rainfall in the south is due mainly to non-TC rainfall. The TC rain ratio varies from 0 to ～25% with a maximum value occurring from 16º to 18ºN in September. The northern region receives a maximum TC_R50 ratio value up to 20% from July to October, whereas the southern region receives a low TC_R50 ratio value throughout the year. The maximum value of TC_R50 ratio occurs in September, October in the mid-central region. Distinct differences in El Niño and La Niña phases were found for both the TC rain ratio and TC_R50 ratio. During El Niño (La Niña) years, the TC rain ratio and TC_R50 ratio significantly decrease (increase) in October-November in the central region, particularly in the 15º to 17ºN region. The results also emphasize that the La Niña phases more strongly affect TC rainfall than the El Niño phases, particularly in central Vietnam. Next, the long-term trends in TC rainfall in the whole Vietnam and four sub-regions, namely REG1 (north of 20ºN), REG2 (17º-20ºN), REG3 (12º-17ºN), and REG4 (south of 12ºN) were investigated for the years from 1961 through 2008. A significant increasing trend with 90% and 95% confidence levels of TC rainfall amount (TCRA) and TC heavy rainfall (TC_R50) is observed clearly at most stations in central coastline. For regional trends, little trends are detected in REG1, REG2, and REG4, while the significant increase is found in REG3 for both TC rainfall amount and TC heavy rainfall days. TCs formed in the WNP contributed more than TCs inside the SCS to that trend during the study period. A larger frequency of negative anomaly of TCRA and TC_R50 indices is seen in the mid-1970s and before 1982 in REG3. On the other hand, a larger frequency of positive anomaly of these indices is seen after 1983, in particular, during the 1990s with a peak in 1990. An increasing trend of heavy rainfall in the central-south Vietnam and a decreasing trend of that index in North Vietnam in the last half of the past century were found in the previous study. These results suggest that the cause of the increasing trend of heavy rainfall in the central-south Vietnam can be explained partly by TC rainfall, while the decreasing trend in north region is due to non-TC rainfall. Finally, more detailed characteristics on the changes in TC rainfall and TC activity for the whole period 1961-2008 in the central part of Vietnam were explored. By applying a regime detection algorithm for TC rainfall, two change-points were found. The results show that TC rainfall including amount and heavy rainfall events increase significantly during the active period 1983-2000 in the central part of Vietnam. The differences in TC rainfall between ID2 (1983-2000) and two inactive periods ID1 (1961-1982) and ID3 (2001-2008) are compared. The results show that the increase in TC rainfall in the period 1983-2000 with the contribution of rainfall accumulated from TCs formed in the WNP in October. The increase of the TC frequency in the SCS/WNP led to an increase in TC rainfall in the period 1983-2000 in the central part of Vietnam. In comparison with the period 1961-1982, both sea surface temperature (SST) and atmospheric variables play a role in TC development in the SCS/WNP during the period 1983-2000. The reason caused an increase TC rainfall during this period not only the number of TCs affecting REG3 but also the number of TC landfall. In comparison with the period 2001-2008, the high of TC number affecting REG3 leading more TC rainfall during the period 1983-2000 is not caused by SST changes, while the role of other atmospheric factors are not very clear.首都大学東京, 2013-09-30, 博士（理学）, 甲第419号首都大学東

Long Memory Conditional Volatility and Dynamic Asset Allocation

The thesis evaluates the benefit of allowing for long memory volatility dynamics in forecasts of the variance-covariance matrix for asset allocation. First, I compare the forecast performance of multivariate long memory conditional volatility models (the long memory EWMA, long memory EWMA-DCC, FIGARCH-DCC and Component GARCH-DCC models) with that of short memory conditional volatility models (the short memory EWMA and GARCH-DCC models), using the asset allocation framework of Engle and Colacito (2006). The research reports two main findings. First, for longer horizon forecasts, long memory volatility models generally produce forecasts of the covariance matrix that are statistically more accurate and informative, and economically more useful than those produced by short memory volatility models. Second, the two parsimonious long memory EWMA models outperform the other models – both short memory and long memory – in a majority of cases across all forecast horizons. These results apply to both low and high dimensional covariance matrices with both low and high correlation assets, and are robust to the choice of estimation window. The research then evaluates the application of multivariate long memory conditional volatility models in dynamic asset allocation, applying the volatility timing procedure of Fleming et al. (2001). The research consistently identifies the economic gains from incorporating long memory volatility dynamics in investment decisions. Investors are willing to pay to switch from the static to the dynamic strategies, and especially from the short memory volatility timing to the long memory volatility timing strategies across both short and long investment horizons. Among the long memory conditional volatility models, the two parsimonious long memory EWMA models, again, generally produce the most superior portfolios. When transaction costs are taken into account, the gains from the daily rebalanced dynamic portfolios deteriorate; however, it is still worth implementing the dynamic strategies at lower rebalancing frequencies. The results are robust to estimation error in expected returns, the choice of risk aversion coefficients and the use of a long-only constraint. To control for estimation error in forecasts of the long memory high dimensional covariance matrix, the research develops a dynamic long memory factor (the Orthogonal Factor Long Memory, or OFLM) model by embedding the univariate long memory EWMA model of Zumbach (2006) into an orthogonal factor structure. The factor-structured OFLM model is evaluated against the six above multivariate conditional volatility models in terms of forecast performance and economic benefits. The results suggest that the OFLM model generally produces impressive forecasts over both short and long forecast horizons. In the volatility timing framework, portfolios constructed with the OFLM model consistently dominate the static and other dynamic volatility timing portfolios in all rebalancing frequencies. Particularly, the outperformance of the factor-structured OFLM model to the fully estimated LM-EWMA model confirms the advantage of the factor structure in reducing estimation error. The factor structure also significantly reduces transaction costs, making the dynamic strategies more feasible in practice. The dynamic factor long memory volatility model also consistently produces more superior portfolios than those produced by the traditional unconditional factor and the dynamic factor short memory volatility models

APPLYING GEOINFORMATICS IN LANDUSE PLANNING AND ENVIRONMENTAL MANAGEMENT FOR THE WETLAND-CASE STUDY OF CANGIO-HOCHIMINH CITY-SOUTH VIETNAM

Joint Research on Environmental Science and Technology for the Eart

The affine cones over Fano-Mukai fourfold of genus 77 are flexible

In this paper, we will show that the affine cones over any smooth Fano-Mukai fourfold of genus $7$ are flexible.Comment: 9 pages, comments are welcome

The Factors Impact on Students' Actual Research Activity in Public Universities in Hanoi, Vietnam

This research aims at identifying and evaluating the factors that affect students' actual research activity. The selected organization for the study is 5 public universities in Hanoi city, Vietnam. The research results have shown that six groups of factors are positively correlated with students' actual research activity, that are: The facilities and financial condition of university; The link between university and business; Program and training organization activities of the university; Teaching methods of lecturer; Student learning motivation; The support of the student family. These groups of factors were measured in 28 observational variables and explained 62.6% the change of dependent variable. Analyse and evaluating the influencing level of these factors to the student actual research activities will help the managers at the universities; the businesses or student parents can notice and have effective measures to enhance the actual research activities for students in various forms, improve the quality of training in order to meet the increasing requirements of the labour market

Erratum: Mott Transition in the Mass Imbalanced Ionic Hubbard Model at Half Filling

Erratum: Mott Transition in the Mass Imbalanced Ionic Hubbard Model at Half Filling[Nguyen Thi Hai Yen, Le Duc Anh, Hoang Anh Tuan, Nguyen Toan Thang and Tran Thi Thu Trang, Communications in Physics, Vol. 29, No. 3SI (2019), pp. 305-312]This paper was published on 22 October 2019 with an omission in the text of the author’s list. The author list should read asNGUYEN THI HAI YEN$^1$, LE DUC ANH$^2$, HOANG ANH TUAN$^{1,3,\dagger}$, NGUYEN TOAN THANG$^1$, TRAN THI THU TRANG$^4$ AND NGUYEN THI HUONG$^5$$^1$Institute of Physics, Vietnam Academy of Science and Technology (VAST), Hanoi, Vietnam $^2$Hanoi National University of Education, Hanoi, Vietnam $^3$Graduate University of Science and Technology, VAST, Hanoi, Vietnam $^4$Ha Long University, Quang Ninh, Vietnam $^5$Thuy Loi University, Hanoi, Vietnam$^{\dagger}$E-mail: [email protected] author’s list has been corrected as of 29 November 2019. The author’s list has been corrected in the electronic version of the journal