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- 저자 : Nghiem, Long Duc (검색결과 74 건)
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Determinants of Technical Efficiency of Microenterprises in Vietnam
Nghiem Tan LE,Hau Long LE,Truc Viet Thanh TRAN 한국유통과학회 2021 The Journal of Asian Finance, Economics and Busine Vol.8 No.6
The aim of this study is to examine the determinants of technical efficiency (TE) of microenterprises (MEs) operating in the coconut handicraft industry in the Mekong Delta of Vietnam. In the first stage of analysis, output-oriented Data Envelopment Analysis (DEA) method is employed to estimate the technical efficiency of the 120 microenterprises operating in the coconut handicraft industry in the Mekong Delta, specifically in Ben Tre province over the year 2019 by using pre-determined three input and one output variables. The estimation results reveal that on average, variable returns to scale technical efficiency (VRS TE), constant returns to scale technical efficiency (CRS TE) and scale efficiency (SE) are 68.4%, 58.0%, and 87.3%, respectively. Tobit regression is applied in the second stage to examine the influences of the determinant factors on VRS TE. The empirical findings of the study imply that firm size, membership in economic association, application of science and technology, and cost-to-revenue ratio positively affect the technical efficiency of the microenterprises operating in the coconut handicraft industry in the Mekong Delta of Vietnam. Considering the results, several governance recommendations are given for business owners to improve firm technical efficiency in order to enhance the brand name of coconut handicrafts.
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Nghiem, Quoc Dat,Pham, Anh Tuan,Kim, Dong Pyo Trans Tech Publications, Ltd. 2006 Materials science forum Vol.510 No.-
<P>Microelectromechanical systems (MEMS) including microchemical devices have been widely concerned, in particular, when made of an extremely stable ceramic material for their use at harsh conditions. SiCBN preceramic polymer was derived from borazine (B3N3H6) modified allylhydridopolycarbosilane (AHPCS) via hydroboration of allyl groups with B-H groups at 0oC for 24 h by following the standard Schenk technique. The extent of polymer-to-ceramic conversion with an ultimate ceramic yield of 92 wt% was investigated by simultaneous TGA, 1H, 13C-NMR, IR, and XRD measurements. The polymer-derived SiCBN ceramic remained as an amorphous solid up to 1400oC. The ceramic product obtained after pyrolysis at 1000-1400oC exhibited excellent oxidation resistance in air. In addition, ceramic microstructures were fabricated by employing soft lithographic technique.</P>
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Synthesis of Inorganic–Organic Diblock Copolymers as a Precursor of Ordered Mesoporous SiCN Ceramic
Nghiem, Q. D.,Kim, D. J.,Kim, D.-P. WILEY-VCH Verlag 2007 Advanced Materials Vol.19 No.17
<B>Graphic Abstract</B> <P>A novel poly(vinyl)silazane-block-polystyrene diblock copolymer is successfully synthesized by living free-radical polymerization via a reversible addition fragmentation chain transfer (RAFT) route (see figure). The obtained diblock copolymer, having an inorganic volume fraction of 0.69, leads to phase-separation at the nanoscale to form an ordered nanostructure, which is converted to well-ordered mesoporous SiCN ceramic after heating at 800 °C and maintained up to 1400 °C. <img src='wiley_img/09359648-2007-19-17-ADMA200602348-content.gif' alt='wiley_img/09359648-2007-19-17-ADMA200602348-content'> </P>
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Synthesis of heat-resistant mesoporous SiOC ceramic and its hydrogen adsorption
Nghiem, Quoc Dat,Cho, Sung June,Kim, Dong-Pyo Royal Society of Chemistry 2006 Journal of materials chemistry Vol.16 No.6
<P>High-temperature stable mesoporous SiOC ceramic was prepared by the self-assembling reaction between an anionic surfactant and the inorganic precursor <I>N</I>-trimethoxylsilylpropyl-<I>N</I>,<I>N</I>,<I>N</I>-trimethylammonium chloride, followed by calcination at 600 °C under nitrogen. The preferred structure was adjusted by varying the co-structure directing agent (CSDA)/surfactant ratio, which allows for better control of the nanoscale morphologies of mesoporous SiOC. The microstructural change was thoroughly investigated by BET, SAXS, TEM, and <SUP>29</SUP>Si NMR. The obtained SiOC products exhibited a high surface area, up to 1762 m<SUP>2</SUP> g<SUP>−1</SUP>, with uniform pore size distribution, which was only reduced to 1403 m<SUP>2</SUP> g<SUP>−1</SUP> when exposed to 800 °C in air. In particular, the mesoporous product showed 1.1 wt% of H<SUB>2</SUB> sorption at 298 K and 25 atm, which could be extended into hydrogen storage materials.</P> <P>Graphic Abstract</P><P>Mesoporous SiOC ceramics with a high surface area (1762 m<SUP>2</SUP> g<SUP>−1</SUP>), which are thermally stable even at temperatures of up to 800 °C, were synthesized using an anionic surfactant as a template for applications such as hydrogen storage. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=b514078a'> </P>
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Nghiem Thi Thu Huong 한국외국어대학교 통번역연구소 2018 한국외국어대학교 통번역연구소 학술대회 Vol.2018 No.10
본 논문은 한반도의 남부의 ‘대한민국(남한)’ 문학을 지칭하는 ‘한국 문학’이라는 용어를 사용한다. 베트남에서 열풍을 일으키고 있는 한류를 한국 문학과 관련지어 연구하고, 바람직한 한류 모델을 제시하여 그 결과 베트남-한국간의 우호 관계 촉진에 기여하기를 바라며, 저자는 베트남에서 이루어지고 있는 한국 문학 번역의 현재 실정을 다방면에 걸쳐 검토하였다. 그 결과, 번역 경험을 바탕으로 하여 (1) 베트남인에게 한국 문학을 이해하기 위한 특정 틀(모델)을 설정, 제시할 필요성, (2) 독자들이 한국 문학으로 다가가는 문을 활짝 열어 줄 필요성, 그리고 (3) 독자가 책에 접근하는 통로를 다양화한다 등을 제언하고자 한다. 이러한 모든 노력이 시너지 효과를 발휘하여 한국 문학이 베트남에서 뚜렷하고 중요한 자취를 남기기를 바라는 것이 저자의 소망이다. The concept of ‘Korean literature’ used in this research means literature developed in the Southern part of the Korean peninsula. This research studies the Hallyu or Korean cultural wave in Vietnam, focusing on the models and positive effects such cultural wave may have. At the same time, the writer - in the position of a translator - also assesses the role of Korean literature as introduced into Vietnam in the Hallyu. The research shows that (1) the importance of molding a typical style for Korean literature in the Vietnamese’s reading map, (2) the importance of opening up doors through which Vietnamese readers can access Korean literature and (3) the need to have diverse ways in bringing books to readers. Through her efforts, the author hopes that Korean literature will play a positive role in the promotion and deepening of the friendship between Vietnam and Korea.
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Preparation of Mesoporous SiCBN Ceramic Templated by Mesoporous Carbon
Nghiem, Quoc Dat,Ryoo, Hyang-Im,Kim, Dong-Pyo The Korean Ceramic Society 2007 한국세라믹학회지 Vol.44 No.7
Well-ordered mesoporous SiCBN ceramics have been successfully synthesized by infiltrating a polymeric precursor, which was prepared from borazine and 2,4,6-trimethyl-2,4,6-trivinylcyclotrisilazane via a hydroboration reaction, into a mesoporous carbon (CMK-3) as a hard template. This was followed by pyrolysis at $1400^{\circ}C$ under nitrogen gas and subsequent oxidative removal of the carbon template without chemical etching. The prepared mesoporous SiCBN ceramic was characterized by a small-angle XRD, TEM, and BET surface area. The resulting mesoporous SiCBN ceramic revealed a BET surface area of $275 m^2g^{-1}$ and a pore volume of $0.8 cm^3 g$ with no crystallization.
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