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Critical Factors on Forest Land Management in Vietnam
Thai Yen TRAN(Thai Yen TRAN ),Phuong Nam PHAM(Phuong Nam PHAM ) 한국유통과학회 2022 The Journal of Asian Finance, Economics and Busine Vol.9 No.9
The study aims to determine the influencing factors and their impact on the management of the forest land used for production allotted to peasant households and proposes solutions to improve its management. Secondary data was calculated until the end of 2019 at state agencies. The primary data was collected through 2 steps. To determine the factors influencing forest land management for production, step one involved a survey of 100 households that were given access to forest land. Step 2 involved a survey of 215 households to determine how factors impacted the Likert scale’s five levels. The study also used a multivariate regression model and SPSS24.0 software to determine the impact rates of factor groups. The study indicated 43 factors that belong to 11-factor groups affecting the management of forest land for production. The policy and legal factors group is the most influential, with an impact rate of 12.72%, followed by 10 other factor groups with impact rates ranging from 4.08% to 11.74%. The solutions include improving policies and laws, strengthening the dissemination of policies and laws; encouraging investment, completing cadastral work, intensifying inspection, examination, and sanctioning of administrative violations of land, upgrading the infrastructure system, and ensuring enough human resources to manage forest land.
The Impact of Global Uncertainty Shocks on Macroeconomics: The Case of Vietnam
Ha Hong TRAN(Ha Hong TRAN ),Vinh Thi Hong NGUYEN(Vinh Thi Hong NGUYEN ),Nam Hoang TRINH(Nam Hoang TRINH ) 한국유통과학회 2022 The Journal of Asian Finance, Economics and Busine Vol.9 No.9
The global financial crisis of 2008–2009 and the COVID-19 pandemic that started in 2019 along with the slow and unstable recovery of the global economy have raised concerns about the impact of global uncertainty on the macroeconomics of the countries. The paper used the Structural Vector Autoregression (SVAR) model to examine the impact of global uncertainty shocks on Vietnam’s economy from the period 2008–2022. We found that Vietnam’s output dropped following the shock of global uncertainty, the peak was in the third month, and lasted for one year. Inflation in Vietnam had a rapid downturn in the first month, peaked in the seventh month, and took a long time to cease. When the economy experienced the shock of increased global uncertainty, Vietnam’s policy interest rate was adjusted downward. Additionally, we included a long-term interest rate to consider the overall impact of monetary policy into account. A decreasing trend was also found with this rate. The global uncertainty shock effects acted as the aggregate demand shocks, reducing output and inflation as the uncertainty increases and vice versa, thus monetary policy can be used to regulate Vietnam’s economy to deal with negative shocks without the trade-offs between output and inflation as aggregate supply shocks.
SOME PROPERTIES OF GENERALIZED LOCAL HOMOLOGY AND COHOMOLOGY MODULES
Nam, Tran Tuan,Minh, Nguyen Duc Korean Mathematical Society 2013 대한수학회보 Vol.50 No.6
We study some properties of representable generalized local homology modules. By duality, we get some properties of good generalized local cohomology modules.
On the Precoder Design for Block Diagonalized MIMO Broadcast Channels
Tran, Le-Nam,Juntti, Markku,Hong, Een-Kee IEEE 2012 IEEE communications letters Vol.16 No.8
<P>Block diagonalization (BD) is a linear precoding technique for MIMO broadcast channels such that it completely eliminates the multiuser interference. Consequently, the precoder of a user must lie in the null space of a matrix composing of other users' channel matrices. In this way, the problem of the precoder design is closely related to finding a basis of the null space of the matrix, which can be computed by, e.g., the singular value decomposition (SVD). Recently, a generalized channel inversion (GCI) method was introduced as a low-complexity design for BD. The GCI-based precoder design is also shown to be optimal for BD. However, since the GCI-based design relies on the pseudo-inverse of a matrix, there are many settings, to which this method is not applicable. In this letter, we first provide a connection between the SVD- and GCI-based designs using the results from linear algebra. Then, from this connection, we propose a precoder design that is devised for the cases where the GCI-based method cannot handle.</P>
Tran, Duc H.,Putri, Witha B. K.,Byeongwon Kang,Nam Hoon Lee,Won Nam Kang IEEE 2014 IEEE transactions on magnetics Vol.50 No.6
<P>The critical current density (J<SUB>c</SUB>) of pulsed-laser-deposited GdBa<SUB>2</SUB>Cu<SUB>3</SUB>O<SUB>7-δ</SUB> (GdBCO) superconducting films with film thickness (d) ranging from 0.2 to 1.5 μm was studied as functions of temperature (T) and held (H). A thickness dependence of both the self-held and the in-held J<SUB>c</SUB>s at 77 K showed that the J<SUB>c</SUB>s were observed to decrease with increasing film thickness as an expression of J<SUB>c</SUB> ~ d<SUP>-1/2</SUP>, which was predicted by the collective pinning theory of uncorrelated defects. However, the in-held J<SUB>c</SUB> at d ~0.6 μm was found to suddenly increase in the general trend of decreasing J<SUB>c</SUB>-d, which probably suggested a change in the pinning mechanism at that film thickness. The temperature dependence of the in-held J<SUB>c</SUB> in the GdBCO films was specifically studied at the low and the intermediate-held regions. A characteristic held H* separating the held-independent and the held-dependent J<SUB>c</SUB> regions was found to decrease with increasing both T and d. The value of α of the J<SUB>c</SUB> ~ H<SUP>α</SUP> dependence in the intermediate-held region was estimated to be α ~0.48-0.52 for both the thin- and the thick-film regions, which is similar to the theoretical value of α = 0.5 for pinning by sparse point-like defects in REBa<SUB>2</SUB>Cu<SUB>3</SUB>O<SUB>7-δ</SUB> (RE: rare-earth elements) superconducting films. The value of α ~ 0.35 estimated for the 0.6 μm thick GdBCO film might suggest that effective pinning induced via nanosized dislocations formed on the surface of the GdBCO film. Based on the application of the theoretical models, it could be concluded that the dominant pinning mechanism in the GdBCO films is pinning by sparse uncorrelated defects.</P>