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Spatial Interpolation of Meteorologic Variables in Vietnam using the Kriging Method
( Xuan Thanh Nguyen ),( Ba Tung Nguyen ),( Khac Phong Do ),( Quang Hung Bui ),( Thi Nhat Thanh Nguyen ),( Van Quynh Vuong ),( Thanh Ha Le ) 한국정보처리학회 2015 Journal of information processing systems Vol.11 No.1
This paper presents the applications of Kriging spatial interpolation methods for meteorologic variables, including temperature and relative humidity, in regions of Vietnam. Three types of interpolation methods are used, which are as follows: Ordinary Kriging, Universal Kriging, and Universal Kriging plus Digital Elevation model correction. The input meteorologic data was collected from 98 ground weather stations throughout Vietnam and the outputs were interpolated temperature and relative humidity gridded fields, along with their error maps. The experimental results showed that Universal Kriging plus the digital elevation model correction method outperformed the two other methods when applied to temperature. The interpolation effectiveness of Ordinary Kriging and Universal Kriging were almost the same when applied to both temperature and relative humidity.
Do, Khac Phong,Nguyen, Ba Tung,Nguyen, Xuan Thanh,Bui, Quang Hung,Tran, Nguyen Le,Nguyen, Thi Nhat Thanh,Vuong, Van Quynh,Nguyen, Huy Lai,Le, Thanh Ha Korea Information Processing Society 2015 Journal of information processing systems Vol.11 No.4
This paper presents the applications of spatial interpolation and assimilation methods for satellite and ground meteorological data, including temperature, relative humidity, and precipitation in regions of Vietnam. In this work, Universal Kriging is used for spatially interpolating ground data and its interpolated results are assimilated with corresponding satellite data to anticipate better gridded data. The input meteorological data was collected from 98 ground weather stations located all over Vietnam; whereas, the satellite data consists of the MODIS Atmospheric Profiles product (MOD07), the ASTER Global Digital Elevation Map (ASTER DEM), and the Tropical Rainfall Measuring Mission (TRMM) in six years. The outputs are gridded fields of temperature, relative humidity, and precipitation. The empirical results were evaluated by using the Root mean square error (RMSE) and the mean percent error (MPE), which illustrate that Universal Kriging interpolation obtains higher accuracy than other forms of Kriging; whereas, the assimilation for precipitation gradually reduces RMSE and significantly MPE. It also reveals that the accuracy of temperature and humidity when employing assimilation that is not significantly improved because of low MODIS retrieval due to cloud contamination.
Indigenous Trichoderma spp. fungi that can antagonize Fusarium spp. fungi causing pineapple stem rot
Ly Ngoc Thanh Xuan,Tran Tri Thong,Phan Tan Nhut,Nguyen Duc Trong,Vo Minh Thuan,Tran Chi Nhan,Le Thi My Thu,Do Thi Xuan,Le Thanh Quang,Nguyen Quoc Khuong 한국미생물학회 2024 미생물학회지 Vol.60 No.3
In this study, we selected indigenous Trichoderma spp. Fungi that antagonized best against Fusarium spp. fungi, which caused the pineapple stem rot disease (PSRD). The experiments consisted of the following: (i) selecting fungi causing the PSRD from rhizosphere and stem of infected pineapple; (ii) evaluating the control ability of Trichoderma spp. fungi selected from soils of healthy pineapple plants to the Fusarium spp. fungi. The selection resulted in 10 out of 20 Fusarium spp. fungi that caused the disease by over 20% severity after six weeks of infection. From 50 Trichoderma spp. fungi, the three Trichoderma strains, T. asperellum T-LM-12, T. asperellum T-LM-22, and T. hamatum T-LM-42, isolated from pineapple farms produced chitinase contents at 208.1, 243.9, and 147.2 U/ml, respectively, which were higher than those of other fungi. Furthermore, the average antagonizing indices of the T-LM-12, T-LM-22, and T-LM-42 strains against the 10 selected Fusarium spp. fungi (Fusarium equiseti strains, Fs-LM-02, Fs-LM-04, Fs-LM-07, Fs-LM-10, Fs-LM-13, and Fs-LM-14; F. incarnatum strains, Fs-LM-09; F. oxysporum strain, Fs-LM-16, and Fs-LM-18; and F. solani strain, Fs-LM-19) were 52.1%, 52.4%, and 46.2%, respectively, 144 h after of inoculation.
( Khac Phong Do ),( Ba Tung Nguyen ),( Xuan Thanh Nguyen ),( Quang Hung Bui ),( Nguyen Le Tran ),( Thi Nhat Thanh Nguyen ),( Van Quynh Vuong ),( Huy Lai Nguyen ),( Thanh Ha Le ) 한국정보처리학회 2015 Journal of information processing systems Vol.11 No.4
This paper presents the applications of spatial interpolation and assimilation methods for satellite and ground meteorological data, including temperature, relative humidity, and precipitation in regions of Vietnam. In this work, Universal Kriging is used for spatially interpolating ground data and its interpolated results are assimilated with corresponding satellite data to anticipate better gridded data. The input meteorological data was collected from 98 ground weather stations located all over Vietnam; whereas, the satellite data consists of the MODIS Atmospheric Profiles product (MOD07), the ASTER Global Digital Elevation Map (ASTER DEM), and the Tropical Rainfall Measuring Mission (TRMM) in six years. The outputs are gridded fields of temperature, relative humidity, and precipitation. The empirical results were evaluated by using the Root mean square error (RMSE) and the mean percent error (MPE), which illustrate that Universal Kriging interpolation obtains higher accuracy than other forms of Kriging; whereas, the assimilation for precipitation gradually reduces RMSE and significantly MPE. It also reveals that the accuracy of temperature and humidity when employing assimilation that is not significantly improved because of low MODIS retrieval due to cloud contamination.
Anatomic characteristics and novel transplantation model of the canine uterus
Xuan-Hai Do,Thanh-Hai Tong,Trung-Chuc Nguyen,Tuan-Anh Ngo,Minh-Trang Thi Tran 대한이식학회 2023 Korean Journal of Transplantation Vol.37 No.2
Background: In Vietnam, the rate of absolute uterine factor infertility is increasing, but no study has been published on uterine transplantation. The present study was designed to comprehensively observe the canine uterine anatomy and to examine the possibility of using a living canine donor for uterine transplantation training and further research. Methods: Ten female Vietnamese mixed-breed dogs were sacrificed for anatomical research, and 15 additional pairs were used to evaluate the novel uterine transplant model. Results: The anatomic features of the canine uterus differed considerably from those of the human uterus, with the uterine vessels originating from branches of the pudendal vessels (also known as the vaginal vessels). The uterine vascular pedicle had a small diameter (1 to 1.5 mm for arteries and 1.2 to 2.0 mm for veins) and required manipulation under a microscope. To perform uterine transplantation, the donor specimen’s artery and vein lengths were successfully reconstructed by anastomosis between both sides of the vasculature using autologous Y-shaped subcutaneous veins. The living-donor uterine transplantation model constructed in this study was feasible, with the transplanted uterus surviving in 86.7% of cases (13/15). Conclusions: Uterine transplantation was successfully performed in a Vietnamese canine living donor model. This model could be helpful in uterine transplantation training and improve the transplantation success rate in humans.
Fabrication and Photoluminescence Properties of ZnS Nanoribbons and Nanowires
Ngo Xuan Dai,Do Thanh Long,Nguyen Ngoc Long,Nguyen Thi Thuc Hien 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.52 No.5
Zinc-sulfide (ZnS) nanoribbons and nanowires were fabricated via thermal evaporation of ZnS powder using a gold catalyst. The ZnS nanoribbons had thicknesses of about 100 nm, lateral di- mensions of several micrometers and lengths of hundreds to thousands of micrometers. The ZnS nanowires have diameters of 200 nm and lengths of thousands of micrometers. The photolumines- cence of the as-synthesized ZnS nanostructures in temperature range from 15 K to room temperature was investigated. We observed two groups of lines, one in the ultraviolet (UV) and one in the visible regions of the photoluminescence spectrum, at 15 K for the ZnS nanoribbons and nanowires. The UV lines were located at 3.777 eV (328.3 nm), 3.735 eV (332.0 nm), 3.699 eV (335.2 nm), 3.657 eV (339.0 nm), 3.618 eV (342.7 nm), 3.573 eV (347.0 nm) and 3.391 eV (365.6 nm). The visible lines were located at 3.024 eV (410.0 nm), 2.842 eV (436.3 nm) and 2.450 eV (506.1 nm). The origins of these emission lines will be discussed. Zinc-sulfide (ZnS) nanoribbons and nanowires were fabricated via thermal evaporation of ZnS powder using a gold catalyst. The ZnS nanoribbons had thicknesses of about 100 nm, lateral di- mensions of several micrometers and lengths of hundreds to thousands of micrometers. The ZnS nanowires have diameters of 200 nm and lengths of thousands of micrometers. The photolumines- cence of the as-synthesized ZnS nanostructures in temperature range from 15 K to room temperature was investigated. We observed two groups of lines, one in the ultraviolet (UV) and one in the visible regions of the photoluminescence spectrum, at 15 K for the ZnS nanoribbons and nanowires. The UV lines were located at 3.777 eV (328.3 nm), 3.735 eV (332.0 nm), 3.699 eV (335.2 nm), 3.657 eV (339.0 nm), 3.618 eV (342.7 nm), 3.573 eV (347.0 nm) and 3.391 eV (365.6 nm). The visible lines were located at 3.024 eV (410.0 nm), 2.842 eV (436.3 nm) and 2.450 eV (506.1 nm). The origins of these emission lines will be discussed.
NGUYEN, Xuan Hung,DANG, Thuy Quynh,DINH, Thi Thao Quyen,DO, Phuong Thanh,PHAM, Thu Uyen,MAI, Duc Duong Korea Distribution Science Association 2022 The Journal of Asian Finance, Economics and Busine Vol.9 No.6
The objective of this article is to assess the impact of corporate social responsibility (CSR) implementation on Corporate Brand Value (CBV) and Corporate Financial Performance (CFP). At the same time, the article examines the mediated role of CBV on the relationship between CSR implementation and CFP. In-depth interviews and observation techniques were used in this article on 4 experts to collect qualitative information. Quantitative analysis was based on primary data obtained from 454 employees working at enterprises providing Bancassurance services. The article uses various models of Cronbach's Alpha coefficient, Exploratory Factor Analysis (EFA), Confirmatory Factor Analysis (CFA), and Structural Equation Analysis (SEM) using SPSS 22.0 and AMOS 20.0 software. In addition, a 5-point Likert scale is used to measure observed variables. Research results show that CBV plays an intermediate role in the relationship between CSR implementation and CFP. At the same time, the implementation of CSR toward communities, customers, and workers directly impacts CBV and CFP. The article draws a new conclusion; there is no relationship found between the implementation of CSR and CFP. The result proposes implications for the state and Bancassurance service providers to develop and implement CSR-related policies and activities to enhance their brand value and financial performance.