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- 저자 : Tien Ngoc HOANG (검색결과 19 건)
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Self-adjusting on-line cutting condition for high-speed milling process
Tien-Dung Hoang,Quang-Vinh Nguyen,Van-Cuong Nguyen,Ngoc-Hien Tran 대한기계학회 2020 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.34 No.8
The paper presents an intelligent control system for self-adjusting on-line cutting condition for high speed machining (self-HSM) with considering the tool-wear amount to keep the machined product’s quality in allowable limit. For realizing the self-HSM, the empirical analysis of variance (ANOVA) and artifical neural network (ANN) are used. The ANOVA is used for generating the empirical functions which are used as the boundary condition as well as constraint evaluation. The ANN is used for generating the new optimal cutting condition. Then, the self-HSM updates this cutting condition on the real machine - HS Super MC500. The new optimal cutting parameter is sent to the controller for updating the new machining condition to keep the machined part’s quality. The integration of the empirical analysis and ANN enables generating the optimal cutting parameters correctly and efficiently for high-speed milling.
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Tien Ngoc DAO,Ha Thi Thu LE,Phuong Thi Mai CHU,Ngan Hoang PHAM,Trang Thi Dai LUONG,Dung Tri TRAN 한국유통과학회 2021 The Journal of Asian Finance, Economics and Busine Vol.8 No.12
Guided by a resource-based theory, this study is the first one that takes a quantitative approach to identify determinants of competitiveness of women-owned small and medium enterprises (SMEs) in Vietnam. The study employs time series data of Vietnamese SMEs extracted from the Vietnam Small and Medium Enterprises Survey conducted biennially from 2005 to 2015 in ten Vietnamese provinces. Firm competitiveness hereby is indicated by revenue, market share, profitability, and export volume. The research reveals a number of determining factors, of all, research and development, labor skills, business environment, technology investment are the most important factors, followed by capital and headcount. It is indicated that the determining factors have different influences on competitiveness obtained by different measurements. Therefore, it is based on specific targets and situations to make wise business decisions. The authors also make comparisons among groups of women-owned enterprises divided by their firm age, location, ownership, export, age, and educational background of business owners. The findings serve as critical empirical evidence and provide policy recommendations for improving the competitiveness of women-owned SMEs in Vietnam. The recommendations range from technology support, education and professional support for female entrepreneurs, access to capital and human resources to business environment improvement.
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Hoang Vu,Tran Quoc Tien,Nguyen Van Nhat,Ngoc Hai Vu,신서용 한국광학회 2024 Current Optics and Photonics Vol.8 No.4
In this report, we present the design, fabrication, and experiment of a static solar system for electric vehicle (EV) applications. The static concentration component is composed of compound parabolic concentrators (CPCs) couplings with multi-junction solar cells, where a flat silicon panel is added to the bottom of the CPV structure to maximize power generation. This design allows the system to collect both direct sunlight and diffused sunlight. The CPCs were fabricated with acrylic with a geometric concentration ratio of 4×. We built a prototype with a (3 × 3) cell array of CPCs with a thickness of 25 mm, which is as thin as conventional flat photovoltaic panels, and performed an outdoor experiment that showed that after six hours of operation, the system had an acceptance angle of approximately 43° and an average daily efficiency of 22.85%.
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Elimination of Heat Problem in POF-based Daylighting Systems
Hoang Vu,Nguyen Manh Hieu,Tran Quoc Tien,Ngoc Hai Vu,Jongbin Park,Seoyong Shin 한국조명·전기설비학회 2020 조명·전기설비학회논문지 Vol.34 No.8
Daylighting gets more attention as people seek better quality of light meanwhile saving electricity which in buildings. Fiberoptic based daylighting systems give us the freedom to provide natural light to any space in the building including north-facing rooms, basements, etc. Using plastic optical fibers (POFs) will significantly reduce costs for these systems. However, POFs are very sensitive to heat. The POF’s maximum operating temperature is 70℃. So, it is difficult to make a daylighting system using POFs that work stably in the long term. In this paper, a new method of eliminating the heat problem in POF-based daylighting systems was introduced. In the design, a UV-IR filter, a secondary optical element (SOE), and small silica optical fiber (SOF) bundles, were included so that the final temperature of the POFs becomes reduced to 56°C from 266℃ while the ambient temperature is 35℃. This result is promising enough for POF-based daylighting systems to be installed practically. Standardization of this method for a fiberoptic daylighting system will be implemented in the near future.
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Luan, Van Hoang,Tien, Huynh Ngoc,Hur, Seung Hyun Elsevier 2015 JOURNAL OF COLLOID AND INTERFACE SCIENCE - Vol.437 No.-
<P><B>Abstract</B></P> <P>Hybrid 3-dimensional (3D) structures composed of zinc oxide (ZnO) nanorods and reduced graphene oxide hydrogel (rGOH) were fabricated by chemical reaction between Zn ions and GO followed by <I>in-situ</I> lateral growth of ZnO nanorods using Zn ions as seed points. The 3D networked ZnO nanorod–rGOH (ZNR–rGOH) fabricated in this study exhibited excellent methylene blue (MB) removal efficiency due to efficient physical adsorption of dye molecules because of electrostatic attractive forces and enhanced photocatalytic activity by the laterally grown ZnO nanorods. The Langmuir–Hinshelwood rate constant of ZNR–rGOH was 4-fold higher than that of pristine rGO due to the enhanced photocatalytic effects obtained by incorporating laterally grown ZnO nanorods inside the rGOH network.</P> <P><B>Highlights</B></P> <P> <UL> <LI> The Covalently-bonded 3D networked graphene hydrogel was fabricated using Zn ions. </LI> <LI> ZnO nanorods were laterally grown inside rGOH networks using hydrothermal synthesis. </LI> <LI> Dye removal efficiency was highly enhanced by using hybrid structures. </LI> <LI> Visible light photocatalytic activity was also observed in the hybrid structures. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
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The Determinants of Listed Commercial Banks’ Profitability in Vietnam
Hai Thanh PHAN,Tien Ngoc HOANG,Linh Viet DINH,Dat Ngoc HOANG 한국유통과학회 2020 The Journal of Asian Finance, Economics and Busine Vol.7 No.11
The study investigates the factors affecting the profitability of listed commercial banks in Vietnam. Survey data for this research were collected from 10 Vietnamese listed commercial banks for the period from 2008 to 2018. In the study, we have built a model of econometric regression with the dependent variable being listed commercial banks’ profitability results measured through ROA. The research methods used include descriptive statistics, IV regression and OLS regression analysis, and the authors carried out the model verification with Stata 14 software. The results showed that operating efficiency, loans size, retail loans ratio, state ownership, inflation rate, and GDP growth are factors that have a positive impact on profitability On the other hand, variables such as capital size, credit risk, liquidity risk, bank size, and revenue diversification are statistically insignificant; hence, these variables are not statistically adequate to indicate the influence of those independent variables to banks’ profitability. The findings of this study suggest that the quality of assets should be considered in the context that bad debt risks come from lending heavily to the real estate sector. Meeting Basel II’s capital compliance requirements is relatively difficult for small listed commercial banks compared to bigger listed commercial banks in Vietnam.
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