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Luong Van Duong,Hong-Ro Lee 한국표면공학회 2014 한국표면공학회지 Vol.47 No.4
Red-emitting nitride phosphors recently attracted considerable attention because of their high thermal stability and high color rendering index properties. For excellent phosphor of white light-emitting-diode, ternary nitride phosphor of Sr/SmSi5N8:Eu<SUP>2+</SUP> with different Eu<SUP>2+</SUP> ion concentration were synthesized by solid state reaction method. In this work, red-emitting nitride Sr/SmSi5N8:Eu<SUP>2+</SUP> phosphor was successfully synthesized by using multi-step high frequency induction heat treatment. The effects of molar ratio of component and experimental conditions on luminescence property of prepared phosphors have been investigated. The structure and luminescence properties of prepared Sr/SmSi5N8:Eu<SUP>2+</SUP> phosphors were investigated by XRD and photoluminescence spectroscopy. The excitation spectra of Sr/SmSi5N8:Eu<SUP>2+ </SUP>phosphors indicated broad excitation wavelength range of 300 - 550 nm, namely from UV to visible area with distinct enhanced emission peaks. With an increase of Eu<SUP>2+</SUP> ion concentration, the peak position of emission in spectra was red-shifted from 613 to 671 nm. After via multi-step heat treatment, prepared phosphor showed excellent luminescence properties, such as high emission intensity and low thermal quenching, better than commercial phosphor of Y3Al5O12:Ce<SUP>3+</SUP>. Using Eu₂O₃ as a raw material for Eu<SUP>2+</SUP>dopant with nitrogen gas flowing instead of using commercial EuN chemical for Sr/SmSi5N8:Eu<SUP>2+</SUP> synthesis is one of characteristic of this work.
Van Duong Luong,Doan Dinh Phuong,Phan Ngoc Minh,문경일 한국물리학회 2017 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.70 No.10
With a view to improving the mechanical properties of coatings applied in the field of cutting tools and machine parts, the TiAlBN coatings were deposited by using direction-current (dc) magnetron sputtering with the various contents of nitrogen gas in an argon-nitrogen gas mixture. The structural characteristics of the coatings were determined by using X-ray diffraction, the friction coefficient, and the hardness and elastic modulus of the coatings were investigated by using a tribometer and nano-indentation. The surface morphologies and the roughnesses of the coatings were analyzed by using field emission scaning electron microscopy (FESEM) and atomic force microscopy (AFM). Additionally, the effects of nitrogen gas flow on the properties of the TiAlBN coatings were investigated. The structural characterization results revealed a typical face-centered cubic TiN structure with (111), (220), and (222) diffraction peaks. The strongest intensity in the (111) orientation was obtained for the coating prepared at a nitrogen gas flow of 4 sccm. For this kind of samples were obtained the highest values of the hardness and the stability, a low friction coefficient, and a smooth surface.
Luong, Hoang Van,Long, Nguyen Van,Duong, Vu Binh,Toan, Nguyen Linh,Minh, Nguyen Van,Quang, Le Bach,Kim, Nam-Hyuck,Byun, Sang-Yo The Korean Society for Biotechnology and Bioengine 2009 KSBB Journal Vol.7 No.4
This study was initiated to investigate the impacts of media types and other components on the callogenensis and cell mass production of Panax vietnamensis in the first step of the cell biomass procedure. Four media were checked: Murashige-Skoog (MS), White, Gamborg and Nitch-AII. All the four media were shown potential media for Panax vietnamensis callogenensis and cell mass production, in which the MS medium showed the best results: the successful callogenensis ratio and cell mass formation were 30% and 62,93 ${\pm}$ 3,63 mg (DW) respectively, the Nitch medium showed the lowest results: the successful callogenensis ratio and cell mass formation were 15% and 27,10 ${\pm}$ 2,24 mg (DW) respectively. The results showed that the MS medium is the most suitable medium for Panax vietnamensis callogenensis and cell mass production.
Luminescence Properties of Ba₃Si<SUB>6</SUB>O<SUB>12</SUB> N₂:Eu<SUP>2+</SUP> Green Phosphor
Van Duong Luong,Dinh Phuong Doan,Hong-Ro Lee 한국표면공학회 2015 한국표면공학회지 Vol.48 No.5
To fabricate white LED having a high color rendering index value, red color phosphor mixed with the green color phosphor together in the blue chip, namely the blue chips with RG phosphors packaging is most favorable for high power white LEDs. In our previous papers, we reported on successful syntheses of Sr₂-Si5N8:Eu<SUP>2+</SUP> and CaAlSiN₃ phosphors for red phosphor. In this work, for high power green phosphor, greenemitting ternary nitride Ba₃Si6O12N₂:Eu<SUP>2+</SUP> phosphor was synthesized in a high frequency induction furnace under N₂ gas atmosphere at temperatures up to 1400℃ using EuF₃ as a raw material for Eu<SUP>2+</SUP>dopant. The effects of molar ratio of component and experimental conditions on luminescence property of prepared phosphors have been investigated. The structure and luminescence properties of prepared Ba₃Si6O12N₂:Eu<SUP>2+</SUP> phosphors were investigated by XRD and photoluminescence spectroscopy. The excitation spectra of Ba₃Si6O12N₂:Eu<SUP>2+</SUP> phosphors indicated broad excitation wavelength range of 250 - 500 nm, namely from UV to blue region with distinct enhanced emission spectrum peaking at ≈ 530 nm.
Hoang Van Luong,Nguyen Van Long,Vu Binh Duong,Nguyen Linh Toan,Nguyen Van Minh,Le Bach Quang,Nam Hyuck Kim,Sang Yo Byun 한국생물공학회 2009 KSBB Journal Vol.24 No.2
This study was initiated to investigate the impacts of media types and other components on the callogenensis and cell mass production of Panax vietnamensis in the first step of the cell biomass procedure. Four media were checked: Murashige-Skoog (MS), White, Gamborg and Nitch-All. All the four media were shown potential media for Panax vietnamensis callogenensis and cell mass production, in which the MS medium showed the best results: the successful callogenensis ratio and cell mass formation were 30% and 62,93 ± 3,63 mg (DW) respectively, the Nitch medium showed the lowest results: the successful callogenensis ratio and cell mass formation were 15% and 27,10 ± 2,24 mg (DW) respectively. The results showed that the MS medium is the most suitable medium for Panax vietnamensis callogenensis and cell mass production.
Impacts of Foreign Direct Investment on Human Capital in ASEAN
Hoi Van NGUYEN,Thuy Thi Thu NGUYEN,Tha Hien TO,Duong Quy DANG,Trang Thi Dai Luong 한국유통과학회 2020 유통과학연구 Vol.18 No.9
Purpose: Research and development of human capital in countries bring sustainable development to the nations. Especially for developing countries, the attraction of foreign direct investment not only brings economic growth to the country but also contributes to improving human capital. This study aims to assess the impact of foreign direct investment on human capital in ASEAN countries. Research design, data and methodology: With data collected from ASEAN countries from 1990 to 2019, panel data analysis is performed with revised model types (the Pooled OLS, Fixed effect model, Random effect model and regression with Driscoll-Kraay standard errors). Result: The results of the regression analysis show that FDI has a positive impact on human capital. At the same time, the study also found that public investment in education also positively affects human capital; the life expectancy factor does not affect human capital. Conclusions: With this research result, the authors also proposed a number of solutions to improve human capital by attracting FDI and improving the efficiency of investment for the education of ASEAN countries. Besides, public expenditure on education also plays an important role in raising human capital. Therefore, investment in education should be promoted further in the future.
Taxus wallichiana Zucc. 현탁세포에서 Jasmonic Acid-Cellulase 복합 Elicitor가 Paclitaxel 생합성에 미치는 영향
Nguyen Ngoc Hoi,Hoang Van Luong,Nguyen Van Long,Vu Binh Duong,변상요(Sang Yo Byun) 한국생물공학회 2010 KSBB Journal Vol.25 No.2
Taxus wallichiana Zucc. 현탁세포배양에서 항암제 paclitaxel 생합성 연구를 수행하였다. 현탁세포배양에서 exponential phase의 최고 생장 속도는 0.14 day-1이었으며 배가시간이 4.96 day이었다. Paclitaxel은 배양초기에 생성되지 않고 exponential phase 말기부터 서서히 생성되어 stationary phase에서도 이어지며 declined phase에서 최고치를 나타내었다. Paclitaxel의 생산을 촉진하기 위하여 elicitor를 사용하였다. 여러 elicitor 중 jasmonic acid와 cellulase가 paclitaxel의 생성을 증가시켰다. Elicitor는 접종과 동시에 투여했을 때 가장 효과가 좋았으며, jasmonic acid와 cellulase의 combination으로 효과가 더욱 증진했는데 각각 투여할 때보다 1.8배 및 3.1배 paclitaxel 생성이 증가되었다. Cell cultures of Taxus wallichiana Zucc. were made to enhance the production of anticancer agent paclitaxel. In suspension cultures, the maximum cell growth rate in exponential growth phase was 0.14 day-1 which was correlated to 4.96 days of cell doubling time. The production of paclitaxel was non-growth associated. The paclitaxel production was started after the exponential growth phase and increased to declined phase where the maximum concentration was observed. Various elicitors were tested to enhance the production of paclitaxel. The combination of two elicitors of jasmonic acid and cellulase increased the production of paclitaxel 1.8 and 3.1 times compared to paclitaxel production by individual elicitor respectively.
Thanh-Tung Duonga,Phan Huy Hoang,Luu Thi Nhan,Luong Van Duong,Man Hoai Nam,Le Quoc Tuan 한국물리학회 2019 Current Applied Physics Vol.19 No.11
Large-grain-size and void-free CH3NH3PbI3 films with bilayer structure are fabricated by spin-coating a PbI2 layer onto a mesoporous TiO2 layer and sequentially spraying CH3NH3I (methylammonium iodide, MAI) multilayers. The sprayer is controlled by a homemade three-axis computer numerical control machine; thus, the substrates are coated by successive parallel passes achieved by moving the nozzle. Spray deposition at the optimal spray rate and substrate temperature produces a large-grain-size and void-free methylammonium lead iodide (MAPbI3) bilayer structure. The mesoporous TiO2 layer plays an important role in electron transport by preventing the return of electrons to the perovskite layer and decreasing the contact resistance at the perovskite/ compact TiO2/fluorine tin oxide interface. When the films are incorporated into a solar cell device with a conductive carbon counter electrode, a maximum power conversion efficiency of 10.58% is realised.
Nguyen, Tuan Lam,Pham, Thi Quynh Nga,Hoang, Van Minh,Kim, Bao Giang,Phan, Thi Hai,Doan, Thu Huyen,Nguyen, Thuy Linh,Duong, Khanh Van,Luong, Ngoc Khue Asian Pacific Journal of Cancer Prevention 2016 Asian Pacific journal of cancer prevention Vol.17 No.no.sup1
Second-hand tobacco smoke (SHS) exposure at home, especially among children, is a serious issue in Viet Nam. During the past decade, much effort has been taken for tobacco control in the country, including various prgorammes aiming to reduce SHS exposure among adults and children. This article analysed trends and factors associated with SHS exposure at home among school children aged 13-15 in Viet Nam, using the Global Youth Tobacco Surveys conducted in 2007 and 2014. Descriptive and inferential statistical methods with logistic regression were applied. Overall, there was a significant reduction in the level of exposure, from 58.5% (95%CI: 57.6-59.3) in 2007 to 47.1% (95%CI: 45.4-48.8) in 2014. Of the associated factors, having one or both parents smoking was significantly associated with the highest odds of SHS exposure at home (OR=5.0; 95%CI: 4.2-6.1). Conversely, having a mother with a college or higher education level was found to be a protective factor (OR=0.5; 95%CI: 0.3-0.8).