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Modelling Stock Market Volatility: Evidence from Vietnam
Ho,Thuy Tien,Ho,Thu Hoai,Ngo,Van Toan 한국유통과학회 2019 KODISA ICBE (International Conference on Business Vol.2019 No.-
This study empirically investigates the volatility pattern of Indian stock market based on time series data which consists of daily closing prices of VN-Index for period 2005 - 2016. The analysis has been done using both symmetric and asymmetric models of Generalized Autoregressive Conditional Heteroscedastic (GARCH). According to Akaike Information Criterion (AIC) and Schwarz Information Criterion (SIC) criteria, the study proves that GARCH (1,1) and TGARCH (1,1) estimations are found to be most appropriate model to capture the symmetric and asymmetric volatility respectively. The study also provides evidence for the existence of asymmetric effects (leverage) by the parameters of the EGARCH(1,1) model that show that negative shocks have significant effects on Conditionally (fluctuate), but in the TGARCH(1.1) model the results are not as expected. This topic also provides investors with a tool to forecast the return of the stock market. At the same time, the results of the study will help investors and policymakers determine the profitability and volatility of the market so that they make the right decision to hold the securities.
Establish Cultivation by Mixing Crops of Different Strains of Eucheuma and Kappaphycus Species
Dang, Diem Hong,Hoang, Minh Hien,Ngo, Thi Hoai Thu,Dinh, Thi Thu Hang,Huynh, Quang Nang The Korean Society for Marine Biotechnology 2010 한국해양바이오학회지 Vol.4 No.1
Species Kappaphycus alvarezii (Doty) Doty, Kappaphycus striatum (Schmitz.) Doty and Eucheuma denticulatum (N. L. Burman) Collins et Harvey, which was brought to Vietnam from Japan in 1993 and Coco island, Martan Sea, Cebu, Philippines in 2005 have been cultivated in the different coasts of South Central Vietnam. Their growth rates and physical properties of carrageenan, then, were analyzed. The obtained results showed that the growth rate of E. denticulatum and K. striatum strains is higher than those of K. alvarezii. Species of K. striatum could grow over wide range of temperature and tolerate more strongly to high temperature compared with K. alvarezii, but their content and gel strength of kappa-carrageenan were almost the same and high. For purpose of the Kappahycus cultivation farms with stable and high production all year round (especially in the seawaters of shallow, semi-closed Lagoons where the water movement is not good and with high temperature in the hot season), mixed cropping of K. alvarezii and K. striatum as seeds stock during different cropping seasons was established. Our results suggested that K. alvarezii and K. striatum could be grown in the cool season (from Oct. to next March) with the same and high content and gel strength of kappa - carrageenan, but in the hot season need to chose K. striatum for cultivation only (from Apr. to Sept.).
Dang, Diem-Hong,Luyen, Hai-Quoc,Hien, Hoang Thi Minh,Thu, Ngo Hoai,Anh, Hoang Lan The Korean Society for Marine Biotechnology 2007 한국해양바이오학회지 Vol.2 No.1
For the first time in Vietnam, morphological and molecular studies of a species belonging to Bacillariophyceae collected in Northern coast of Vietnam are presented. Observations with microscope showed that this species belong to genus: Pseudo-nitzschia and seem like P. pungens. Sequence data from the partial 18S small subunit ribosomal RNA gene (18S rDNA) and the internal transcribed spacer 1 - 5.8S - internal transcribed 2 have been used to determine clearly and generate a phylogenetic framework of the obtained sequences to previously reported sequences in GenBank. These results allowed us to highlight described species of Bacillariophyceae in Northern coast of Vietnam. Furthermore, accumulation of molecular study would be helpful for the identification of scientific name of harmful algal species and further taxonomic studies in Vietnam.