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Effect of land use change on water discharge in Srepok watershed,Central Highland,Viet Nam

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International Soil and Water Conservation Research 2014年第3期2卷 74-86页

作者： nguyen Thi ngoc Quyen nguyen Duy Liem nguyen Kim Loi Tay nguyen University Viet Nam.567 Le Duan streetBuon Ma Thuot CityDak Lak Province Nong Lam University Viet Nam.Linh Trung WardThu Duc districtHo Chi Minh City

Srepok watershed plays an important role in Central Highland in Viet *** impacts to developing social-economic ***,it is necessary to research elements which impact to natural resources in this *** Soil and Water Assessment Tool(SWAT)model and Geography Information System(GIS)were used to simulate water discharge in the Srepok *** objectives of the research were to apply GIS and SWAT model for simulation water discharge and then,we assessed land use change which impacted on water discharge in the *** observed stream flow data from Ban Don Stream gauge station was used to calibrate for the period from 1981 to 2000 and then validate for the period from 2001 to *** using SWAT-CUP software to calibration,NSI reached 0.63 and R square value achieved 0.64 from 2004 to 2008 in calibration and NSI gained good level at 0.74 and R square got 0.75 from 2009 to 2012 in validation step at Ban Don *** that,land cover in 2010 was processed like land cover in 2000 and set up SWAT model *** simulated water discharge in scenario 1(land use 2000)was compared with scenario 2(land use 2010),the simulation result was not significant difference between two scenarios because the change of area of land use was not much enough to affect the fluctuation of water ***,the effect of land cover on water resource could be seen clearly via total water *** percentage of surface flow in 2000 was twice times more than in 2010;retard and base flow in 2000 was slightly more than in ***,decreased surface flow,increased infiltration capacity of water and enriched base flow resulted in the growth of land cover.

关键词： Water discharge Land use change GIS SWAT model Simulations

The Impact of Transport Infrastructure on Foreign Direct Investment Inflows:A Comparative Analysis of Landlocked and Coastal Countries in Developing Asia

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The Impact of Transport Infrastructure on Foreign Direct Inv...

作者： nguyen ngoc HA 上海财经大学

学位级别：硕士

In today's globalized economy,foreign direct investment(FDI)has been identified as an important driver of economic growth in developing Asian ***,the inflow of FDI is influenced by various factors,and FDI in each region,each country,and each group of economies may involve different set of determinants depending on the destination's own economic,geographical or political characteristics,as well as the investing motives of the *** study examines the impact of infrastructure on FDI inflows in developing Asian countries,with a particular focus on the differences between landlocked and coastal *** results show that transport infrastructure and gross fixed capital formation(GFCF)as a comprehensive proxy for infrastructure have a positive and significant impact on FDI inflows in landlocked ***,for coastal countries,transport infrastructure has no significant effect on FDI *** findings have important theoretical and managerial implications for policymakers to consider when making decisions about infrastructure development and FDI attraction strategies in developing Asian countries.

关键词： FDI developing countries Asia infrastructure transport landlocked countries determinants

Treatment for COVID-19 patients in Vietnam: Analysis of time-to-recovery

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Asian Pacific Journal of Tropical Medicine 2020年第9期13卷 397-401页

作者： Khuong quynh Long Hoang Hong Hanh Tran Thi Tuyet Hanh La ngoc Quang Hoang Van Minh Hanoi University of Public Health 1A Duc Thang RoadDuc Thang WardNorth Tu Liem DistrictHanoiVietnam

Objective:To describe the recovery time and related factors among COVID-19 patients in ***:We used the secondary data obtained from the official database of the Ministry of Health of Vietnam and other public data sources that were available by April 9 th,*** proportional hazards model was carried out to identify factors related to recovery time among COVID-19 ***:By April 9 th,2020,the cumulative number of COVID-19 cases detected in Vietnam was 255,of which 129(50.6%)patients had fully *** median recovery time of patients was 17(95%CI=16-19)*** patients had a lower likelihood of recovery(HR=0.98,95%CI=0.97-0.99,P<0.001),whereas patients with a history of international incoming travel had a higher likelihood of recovery(HR=1.57,95%CI=1.03-2.40,P=0.036).There was no statistically significant difference in the recovery time of patients treated in different hospital ***:More attention is needed for older patients and who did not have international travel *** confirmed with COVID-19 could be treated at local health facilities to avoid unnecessary referrals and burdens to specialized hospitals at the central level.

关键词： COVID-19 Coronavirus Recovery Vietnam

How knowledge of hepatitis B disease and vaccine influences vaccination practices among parents in Ho Chi Minh City, Vietnam

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Asian Pacific Journal of Tropical Medicine 2021年第3期14卷 122-127页

作者： Giao Huynh Le An Pham Thien Thuan Tran ngoc Nga Cao Thi ngoc Han nguyen Quang Vinh Bui Faculty of Public Health University of Medicine and Pharmacy at Ho Chi Minh CityVietnam Center for Training of Family Medicine University of Medicine and Pharmacy at Ho Chi Minh CityVietnam Department of Infectious Diseases University of Medicine and Pharmacy at Ho Chi Minh CityVietnam Infection Control Department University Medical Center at Ho Chi Minh CityVietnam Department of Pediatrics University of Medicine and Pharmacy at Ho Chi Minh CityVietnam

Objective:To assess the influences of the knowledge of parents about hepatitis B virus(HBV)infection and the benefit of HBV vaccination on the practice of HBV vaccination among ***:A prospective cross-sectional study recruited parents whose children,aged 12-24 months,received HBV vaccination at Commune Health Centers(CHCs)in Ho Chi Minh City from Feb.2016 to *** were interviewed using a questionnaire that included 11-item binary knowledge questions and checked their children’s vaccination ***:A total of 768 parents had a mean age of(30.8±5.1)*** mean knowledge score of the 11-item questions was(7.0±2.4).The knowledge score was positively associated with full and timely HBV *** addition,children who received complete and timely HBV vaccination were significantly more likely to live in rural areas(Adjusted OR 4.02,95%CI 2.79-5.79,P<0.001).Also,children whose parents received vaccination information from health care providers,and had knowledge about HBV risk,had a higher rate of full and timely HBV vaccination(Adjusted OR 1.60,95%CI 1.13-2.29,and Adjusted OR 1.47,95%CI 1.01-2.13,P all<0.05).Conclusions:Parents possessed a great deal of incorrect knowledge about *** health education from health care providers should target parents living in specific locations and focus on the benefits of HBV vaccine.

关键词： Knowledge Hepatitis Health Belief Model Vaccination Questionnaire

A fully automated framework for helicopter rotor blades design and analysis including aerodynamics,structure, and manufacturing

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Chinese Journal of Aeronautics 2016年第6期29卷 1602-1617页

作者： ngoc Anh Vu Jae Woo Lee Tuan Phuong Nam Le Song Thanh Thao nguyen Division of Computational Mechatronics Institute for Computational Science Ton Duc Thang University Faculty of Electrical & Electronics Engineering Ton Duc Thang University Department of Aerospace Information Engineering Konkuk University Faculty of Mechanical Engineering Industrial University of Ho Chi Minh City Department of Aerospace Engineering Ho Chi Minh City University of Technology Vietnam National University-Ho Chi Minh City

This study describes an integrated framework in which basic aerospace engineering aspects(performance, aerodynamics, and structure) and practical aspects(configuration visualization and manufacturing) are coupled and considered in one fully automated design optimization of rotor blades. A number of codes are developed to robustly perform estimation of helicopter configuration from sizing, performance analysis, trim analysis, to rotor blades configuration representation. These codes are then integrated with a two-dimensional airfoil analysis tool to fully design rotor blades configuration including rotor planform and airfoil shape for optimal aerodynamics in both hover and forward flights. A modular structure design methodology is developed for realistic composite rotor blades with a sophisticated cross-sectional geometry. A D-spar cross-sectional structure is chosen as a baseline. The framework is able to analyze all realistic inner configurations including thicknesses of D-spar, skin, web, number and ply angles of layers of each composite part,and materials. A number of codes and commercial software(ANSYS, Gridgen, VABS, Pre VABS,etc.) are implemented to automate the structural analysis from aerodynamic data processing to sectional properties and stress analysis. An integrated model for manufacturing cost estimation ofcomposite rotor blades developed at the Aerodynamic Analysis and Design Laboratory(AADL),Aerospace Information Engineering Department, Konkuk University is integrated into the framework to provide a rapid and dynamic feedback to configuration design. The integration of three modules has constructed a framework where the size of a helicopter, aerodynamic performance analysis, structure analysis, and manufacturing cost estimation could be quickly investigated. All aspects of a rotor blade including planform, airfoil shape, and inner structure are considered in a multidisciplinary design optimization without an exception of critical configuration.

关键词： Design optimization Helicopter rotor blades Integrated framework Modular structure design methodology Perform estimation

On Huppert＇s Conjecture for Alternating Groups of Low Degrees

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Algebra Colloquium 2015年第2期22卷 293-308页

作者： Hung ngoc nguyen Hung P. Tong-Viet Thomas P. Wakefield Department of Mathematics The University of Akron Akron Ohio 44325 USA School of Mathematical Sciences. North-West University (Mafikeng Campus) Mmabatho 2735 South Africa Department of Mathematics and Statistics Youngstown State University One University Plaza Youngstown Ohio 44555 USA

Bertram Huppert conjectured in the late 1990s that the nonabelian simple groups are determined up to an abelian direct factor by the set of their character degrees. Although the conjecture has been established for various simple groups of Lie type and simple sporadic groups, it is expected to be difficult for alternating groups. In [5], Hup- pert verified the conjecture for the simple alternating groups AN of degree up to 11. In this paper, we continue his work and verify the conjecture for the alternating groups of degrees 12 and 13.

关键词： alternating groups character degrees

Effects of low energy (160 keV) X-ray on microbial inactivation,sprouting inhibition and genetic variation in potato

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Food Bioscience 2022年第3期47卷 262-270页

作者： nguyen An Son nguyen Thi Nguyet Ha nguyen Thi Minh Sang Le Doan Dinh Duc Le ngoc Trieu Faculty of Physic and Nuclear Engineering Da Lat UniversityViet Nam Dalat Vocational Training College Viet Nam Faculty of Biology Da Lat UniversityViet Nam

The effects of low energy X-ray irradiation on microbial inactivation,sprouting inhibition and genetic variation were *** was an inverse correlation between the exposure dose in range of 0 Gy–5000 Gy and the survival rate of *** dose of 1000 Gy seemed to be suitable for inactivation of microorganisms because the respective survival rate is relatively low (0.59%).Dose rate of 13.87 Gy/min was the most appropriate to inactivate the microorganisms,with the survival rate of 0.37%.Applying the irradiation dose of 1000 Gy and dose rate of 13.87 Gy/min,there was a significant sprouting inhibition of irradiated potatoes compared to the control for six months *** effect of irradiation dose (100–1200 Gy) and dose rate (8.63–19.62 Gy/min) on genetic variation of the irradiated samples was assessed by DNA fingerprints induced from using three molecular techniques including Random Amplified Polymorphic DNA (RAPD),Start Codon Targeted Polymorphism (SCoT) and CAAT box – derived polymorphism (CBDP).At the irradiation dose of 1000 Gy and dose rate of 13.87 Gy/min,the level of genetic variation was relatively low (4.85%).Thus,this treatment is a suitable condition of irradiation for potato treatment with the purpose of preservation.

关键词： Dose Dose rate Low energy X-ray Microbial inactivation Potato

COVID-19 vaccination intention among healthcare workers in Vietnam

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Asian Pacific Journal of Tropical Medicine 2021年第4期14卷 159-164页

作者： Giao Huynh Thien Thuan Tran Han Thi ngoc nguyen Le An Pham Faculty of Public Health University of Medicine and Pharmacy at Ho Chi Minh CityHo Chi Minh CityVietnam Infection Control Department University Medical Center Ho Chi Minh CityHo Chi Minh CityVietnam Family Medicine Training Center University of Medicine and Pharmacy at Ho Chi Minh CityHo Chi Minh CityVietnam

Objective:To assess the acceptance of coronavirus disease(COVID-19)vaccine among healthcare workers at two general hospitals in Vietnam when it is ***:A cross-sectional study was conducted using a convenience sampling from January to February 2021 among 410 healthcare workers at two general hospitals in Vietnam via a selfadministered questionnaire.A multivariable regression analysis was performed to determine predictors of vaccine acceptance including the demographic factors,COVID-19 knowledge,and vaccine beliefs based on the domains of Health Belief ***:Among 410 healthcare workers,76.10%showed vaccination *** of acceptance were determined that the group reporting as“vaccine acceptance”was more likely to be positive towards the perceived susceptibility and severity of COVID-19(OR 2.45;95%CI 1.48-4.06,P<0.05),perceived benefits of vaccination,and cues to action(OR 4.36;95%CI 2.35-8.09,and OR 5.49;95%CI 2.84-10.61,respectively,all P<0.001),but less likely to have the perceived barriers to vaccination(OR 0.19;95%CI 0.09-0.38;P<0.001)compared with the no acceptance ***,people who had a good knowledge regarding the severity of illness were 3.37 times more likely to have identified as vaccine acceptance(OR 3.37;95%CI 1.04-10.86,P<0.05).The demographic factors were also associated with willingness to receive the vaccine,with participants who were staff and received COVID-19 information from relatives were less likely to accept the vaccine over those who were doctors and not receiving information from relatives(OR 0.36;95%CI 0.13-0.96,and OR 0.37;95%CI 0.17-0.78,respectively,all P<0.05).Conclusions:A rate of willingness to get vaccinated against COVID-19 was relatively high with discrepancies between occupation,receiving information from relatives,knowledge toward the severity of illness,and the elements of Health Belief *** findings will provide information for the management authorities to develop relevant interv

关键词： Acceptance COVID-19 Healthcare workers Intention SARS-CoV-2 Vaccination

The future of COVID-19 vaccination rates for children

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Asian Pacific Journal of Tropical Medicine 2022年第9期15卷 381-382页

作者： Giao Huynh Kimberly H.nguyen Han Thi ngoc nguyen Tuan Diep Tran Pham Le An Faculty of Public Health University of Medicine and Pharmacy at Ho Chi Minh CityHo Chi Minh CityVietnam Department of Public Health and Community Medicine Tufts University School of MedicineBostonMAUSA Infection Control Department University Medical Center Ho Chi Minh CityHo Chi Minh CityVietnam Faculty of Medicine University of Medicine and Pharmacy at Ho Chi Minh CityHo Chi Minh CityVietnam Family Medicine Training Center University of Medicine and Pharmacy at Ho Chi Minh CityHo Chi Minh CityVietnam

The COVID-19 pandemic has been ongoing for over two years since the first case was reported in the end of January *** has successfully controlled the pandemic through its vaccination campaign,targeted messages and applications of various public health interventions including social distancing,quarantining,masking,and hand washing,which have made some significant achievements in reducing hospitalizations and deaths[1].

关键词： vaccination targeted COV