What Makes Vietnamese (Not) Attend Periodic General Health Examinations? A 2016 Cross-sectional Study

Quan-Hoang Vuong,Quang-Hoi Vu,Thu-Trang Vuong 질병관리본부 2017 Osong Public Health and Research Persptectives Vol.8 No.2

Objectives: General health examinations (GHE) have become an increasingly common measure for preventive medicine in Vietnam. However, little is known about the factors among Vietnamese people who attend or miss GHE. Budget or time constraints remain to be evaluated for better-informed policy making. This study investigates factors affecting behaviors in attending periodic GHE. The main objectives are as follows: (1) to explore empirical relationships between influencing factors and periodic GHE frequencies, and (2) to predict the probabilities of attending GHE under associated conditions. Methods: The study used a 2,068-observational dataset, obtained from a Vietnamese survey in 2016. The analysis was then performed using the methods of baseline-category logits for establishing relationships between predictor and response variables. Results: Significant relationships were found among the expenditure and time consumption, health priority and sensitivity to health data, insurance status, and frequency of GHE, with most p-values = 0.01. Conclusion: Generally, people attended the GHE when they had the resources and health priorities (72.7% probability). Expenditure and time remain key obstacles to the periodic GHE. Health priority and health data are important in improving rates for GHEs. Health insurance should play a positive role in promoting the GHE.

Characteristics of retracted articles based on retraction data from online sources through February 2019

Quan-Hoang Vuong,Viet-Phuong La,Manh-Tung Ho,Thu-Trang Vuong,Manh-Toan Ho 한국과학학술지편집인협의회 2020 Science Editing Vol.7 No.1

Purpose: Although retractions are commonly considered to be negative, the fact remains that they play a positive role in the academic community. For instance, retractions help scientific enterprise perform its self-correcting function and provide lessons for future researchers; furthermore, they represent the fulfillment of social responsibilities, and they enable scientific communities to offer better monitoring services to keep problematic studies in check. This study aims to provide a thorough overview of the practice of retraction in scientific publishing from the first incident to the present. Methods: We built a database using SQL Server 2016 and homemade artificial intelligence tools to extract and classify data sources including RetractionWatch, official publishers’ archives, and online communities into ready-to-analyze groups and to scan them for new data. After data cleaning, a dataset of 18,603 retractions from 1,753 (when the first retracted paper was published) to February 2019, covering 127 research fields, was established. Results: Notable retraction events include the rise in retracted articles starting in 1999 and the unusual number of retractions in 2010. The Institute of Electrical and Electronics Engineers, Elsevier, and Springer account for nearly 60% of all retracted papers globally, with Institute of Electrical and Electronics Engineers contributing the most retractions, even though it is not the organization that publishes the most journals. Finally, reasons for retraction are diverse but the most common is “fake peer review”. Conclusion: This study suggests that the frequency of retraction has boomed in the past 20 years, and it underscores the importance of understanding and learning from the practice of retracting scientific articles.

Research on Macroeconomics Factors Influencing Seaborne Trade in Vietnam: An Autoregressive Distributed Lag Approach

Thu Giang VUONG,Toan Thuyen VUONG 국제이네비해양경제학회 2021 International Journal of e-Navigation and Maritime Vol.16 No.1

It would appear that the diversification of the methods of international transport has made global trade much easier. With the outstanding advantages of cargo volumes, shipping costs and safety of goods, sea transport always accounts for a high proportion of the export and import activities of coastal countries. Today, therefore, seaborne trade is the main method of foreign trade in Vietnam and the world. Towards solutions in the area of seaborne trade development, this study aims to find the essential macroeconomics factors influencing directly seaborne trade by applying autoregressive distributed lag (ARDL) models with a case study of Vietnam. This paper finds that Vietnam’s GDP and FDI have positive impacts on Vietnam’s seaborne trade turnover in both the short run and long run. The findings here make a significant contribution to the search for practical scientific solutions to enhance Vietnam’s seaborne trade development.

Development of New Haptic Interface using "Dielectric Elastomers

nguyen Huu Lam Vuong,Nguyen Huu Chuc,Sungmoon Jin,Baek Chul Kim,Duk Sang Kim,Kuang Jun An,Vuong Hong Phuc,Ja Choon Koo,Hyungpil Moon,Youngkwan Lee,Jae Do Nam,Hyouk Ryeol Choi 제어로봇시스템학회 2009 제어로봇시스템학회 합동학술대회 논문집 Vol.2009 No.12

EDTA Linker for S-scheme CdS/Spinel Oxides Heterojunction Photocatalyst for Visible-Light-Driven Hydrogen Production

VUONG HOAI THANH,MAHVELATISHAMSABADI TAHEREH,DANG THANH TRUONG,허승현,정진석 한국화학공학회 2024 Korean Journal of Chemical Engineering Vol.41 No.1

Herein, the fabrication of S-scheme CdS/ZMO photocatalysts through EDTA bridges for hydrogen production was reported. In this system, the role of EDTA molecules as a linker for binding CdS and ZMO (ZnMn 2 O 4 /Mn 3 O 4 spinel oxides composite) was investigated in detail. The optimized sample showed superior photocatalytic hydrogen evolution rate of 26.34 mmol. g −1 .h −1 , nearly two times higher than the system without EDTA. The outstanding photocatalytic activity could be due to the effi cient charge transfers caused by the interaction between EDTA molecules and two semiconductors. This study provides a clear insight into the critical role of inexpensive organic electron mediators in enhancing the photocatalytic performance of heterojunction photocatalysts.

Realization of an open space ensemble for nanowires: a strategy for the maximum response in resistive sensors

Vuong, Nguyen Minh,Jung, Hyuck,Kim, Dojin,Kim, Hyojin,Hong, Soon-Ku The Royal Society of Chemistry 2012 Journal of materials chemistry Vol.22 No.14

<P>Here, we used NO as a test gas to propose a strategy for a nanowire gas sensor with the maximum response—the lowest detection limits. The apparatus uses an open space ensemble structure of nanowires with diameters at near total-depletion. For this purpose, a series of open space nanowire structures of WO<SUB>3</SUB> was fabricated with diameters varying from 35 to 82 nm, and a corresponding conduction nanowire sensor model was proposed. The nanowire structures revealed the highest response and a lowest detection limit of 30 ppb. Furthermore, the sensor response was maximum with nanowires of ∼40 nm, which is the diameter corresponding to total depletion conditions; the response was decreased at smaller diameters. The sensor model successfully explained the ultimate lower limits of the size effect in the nanowire sensors. To realize optimum sensor performance with the practical ensemble type nano-structures, an open space morphology is critical to remove the effect of gas diffusion throughout the structure.</P> <P>Graphic Abstract</P><P>High porosity is a requirement to high performance of nanowire-ensemble sensors whose resistances are controlled by the surface depletion mechanism. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c2jm15971f'> </P>

Determining Ideal Strength and Electronic Properties of Ge/Si Core-Shell Nanowires

Vuong Van Thanh,Nguyen Tuan Hung,Tran The Quang,Do van Truong 한국정밀공학회 2019 한국정밀공학회지 Vol.36 No.8

Core/shell nanowire (NW) is recognized as promising one-dimensional material for nanoelectronic and nanoelectromechanical systems. However, its mechanical properties so important for engineering applications remain largely unexplored. Based on the density functional theory (DFT), we theoretically investigate mechanical and electronic properties of the Ge-core/Si-shell NWs along the [100] direction within the cross sectional size of 1.0 nm and 1.4 nm under the axial strain. Our results show that ideal strength of Ge-core/Si-shell NWs strongly depends on wire cross sectional size compared with that of the Si and Ge NWs. Ideal strength (maximum tensile strength) of Ge-core/Si-shell NWs increases significantly when increasing thickness of the Si-shell. We found that bond lengths around interfaces between the core and the shell play a predominant role in ideal strength of Ge-core/Si-shell NWs. Additionally, band structures of NWs are modififed by applying axial strain. Band gaps of NWs decrease with increasing strain. Our results provide important insight into intrinsic mechanical behavior and electronic properties of Ge-core/Si-shell NWs, useful for the design of nanodevices with Ge-core/Si-shell NWs in future applications.

Adhesion of Human Osteoblasts Cell on CrN Thin Film Deposited by Cathodic Arc Plasma Deposition

Vuong Hung Pham,Sun Kyu Kim 한국표면공학회 2009 한국표면공학회지 Vol.42 No.5

Interaction between human osteoblast (hFOB 1.19) and CrN films was conducted in vitro. CrN films were produced by cathodic arc plasma deposition. The surface was characterized by atomic force microscopy (AFM). CrN films, glass substrates and TiN films were cultured with human osteoblasts for 48 and 72 hours. Actin stress fiber patterns and cell adhesion of osteoblasts were found less organized and weak on CrN films compared to those on the glass substrates and the TiN films. Human osteoblasts also showed less proliferation and less distributed microtubule on CrN films compared to those on glass substrates and TiN films. Focal contact adhesion was not observed in the cells cultured on CrN films, whereas focal contact adhesion was observed well in the cells cultured on glass substrates and TiN films. As a result, the CrN film is a potential candidate as a surface coating to be used for implantable devices which requires minimal cellular adhesion.

Kinesin-II recruits Armadillo and Dishevelled for Wingless signaling in <i>Drosophila</i>

Vuong, Linh Thuong,Mukhopadhyay, Bibhash,Choi, Kwang-Wook The Company of Biologists Limited 2014 Development (Cambridge) Vol.141 No.16

<P>Wingless (Wg)/Wnt signaling is fundamental in metazoan development. Armadillo (Arm)/β-catenin and Dishevelled (Dsh) are key components of Wnt signal transduction. Recent studies suggest that intracellular trafficking of Wnt signaling components is important, but underlying mechanisms are not well known. Here, we show that Klp64D, the <I>Drosophila</I> homolog of Kif3A kinesin II subunit, is required for Wg signaling by regulating Arm during wing development. Mutations in <I>klp64D</I> or RNAi cause wing notching and loss of Wg target gene expression. The wing notching phenotype by Klp64D knockdown is suppressed by activated Arm but not by Dsh, suggesting that Klp64D is required for Arm function. Furthermore, <I>klp64D</I> and <I>arm</I> mutants show synergistic genetic interaction. Consistent with this genetic interaction, Klp64D directly binds to the Arm repeat domain of Arm and can recruit Dsh in the presence of Arm. Overexpression of Klp64D mutated in the motor domain causes dominant wing notching, indicating the importance of the motor activity. Klp64D shows subcellular localization to intracellular vesicles overlapping with Arm and Dsh. In <I>klp64D</I> mutants, Arm is abnormally accumulated in vesicular structures including Golgi, suggesting that intracellular trafficking of Arm is affected. Human KIF3A can also bind β-catenin and rescue <I>klp64D</I> RNAi phenotypes. Taken together, we propose that Klp64D is essential for Wg signaling by trafficking of Arm via the formation of a conserved complex with Arm.</P>

A new assumed strain solid–shell formulation “SHB6” for the six-node prismatic finite element

Vuong-Dieu Trinh,Farid Abed-Meraim,Alain Combescure 대한기계학회 2011 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.25 No.9

This paper presents the development of a new prismatic solid–shell finite element, denoted SHB6, obtained using a purely threedimensional approach. This element has six nodes with displacements as the only degrees of freedom, and only requires two integration points distributed along a preferential direction, designated as the “thickness”. Although geometrically three-dimensional, this element can be conveniently used to model thin structures while taking into account the various phenomena occurring across the thickness. A reduced integration scheme and specific projections of the strains are introduced, based on the assumed-strain method, in order to improve performance and to eliminate most locking effects. It is first shown that the adopted in-plane reduced integration does not generate “hourglass” modes, but the resulting SHB6 element exhibits some shear and thickness-type locking. This is common in linear triangular elements, in which the strain is constant. The paper details the formulation of this element and illustrates its capabilities through a set of various benchmark problems commonly used in the literature. In particular, it is shown that this new element plays a useful role as a complement to the SHB8PS hexahedral element, which enables one to mesh arbitrary geometries. Examples using both SHB6 and SHB8PS elements demonstrate the advantage of mixing these two solid–shell elements.