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Mai Ha Hoang,박지은,Dinh Long Phan,Trinh Tung Ngo,Tuyen Van Nguyen,박창근,조민주,최동훈 한국고분자학회 2018 Macromolecular Research Vol.26 No.9
Two new wide-bandgap conjugated copolymers, T-3MT and 2T-3MT, containing methyl-3-thiophenecarboxylate (3MT) as a weak accepting unit and indacenodithiophene (IDT) or indacenodithienothiophene (IDTT) as ladder-type donating units, were synthesized through Stille coupling polymerization. The effects of the IDT and IDTT units on the physical, optical, and electrochemical properties of these copolymers were investigated. Polymer solar cells (PSCs) were constructed using these new copolymers and different acceptor molecules for inter-comparative analysis of their performance. The PSCs bearing the as-cast active layers with 2,2'-((2Z,2'Z)-((4,4,9,9-tetrakis(4-hexylphenyl)-4,9-dihydro-s-indaceno[1,2-b:5,6-b'] dithiophene-2,7-diyl)bis(methanylylidene))bis(3-oxo-2,3-dihydro-1H-indene-2,1-diylidene))dimalononitrile (IM-IDT) displayed the highest PCEs of 3.78−3.96%, mainly owing to the predominant face-on orientation of blend #ilm, and the relatively high open circuit voltage exceeding 1.0 V.
Hoang, Mai Ha,Cho, Min Ju,Kim, Kyung Hwan,Lee, Tae Wan,Jin, Jung-Il,Choi, Dong Hoon The Chemical Society of Japan 2010 Chemistry letters Vol.39 No.4
<P>We report on the design and synthesis of a new discotic liquid crystalline (LC) semiconducting material based on a triphenylene core. The molecule is readily soluble in common organic solvents to exhibit self-organizing long fiber structures with supramolecularly ordered columnar stacks that lie parallel to the substrate. Compared to all the previously reported triphenylene derivatives, this molecule has a relatively lower band gap energy (<I>E</I><SUB>g</SUB> = 2.53 eV), which makes it suitable for electronic and optoelectronic applications.</P>
The Moderating Role of CSR Associations on the Link between Brand Awareness and Purchase Intention
HOANG, Xuan Lam,NGUYEN, Thi Kim Chi,LY, Hoang Mai,LUONG, Thu Thuy,NGUYEN, Thi Thanh Quy Korea Distribution Science Association 2020 The Journal of Asian Finance, Economics and Busine Vol.7 No.6
This study uses the moderating model to explore the relationships between Corporate Social Responsibility (CSR) associations, brand awareness and consumer purchase intention. Besides investigating the direct effects of CSR associations on brand awareness and consumer purchase intention, this study also focuses on discovering the moderating role of CSR associations on the relationship between brand awareness and consumer purchase intention among Vietnamese students. Adapting scales from previous research, the authors distribute questionnaires to consumers across the country. Then, the validity and reliability are tested via Cronbach's alpha, Exploratory Factor Analysis (EFA) and Confirmatory Factor Analysis (CFA). Moreover, by employing a meta-analytical path analysis with a sample of 686 consumers, the authors show that CSR associations play an important role in shaping purchase intention among Vietnamese consumers regarding the consumption of organic milk products. Also, CSR associations have a strong effect on brand awareness. However, our study shows that purchase intention is not directly affected by brand awareness. In other words, brand awareness does not mediate the relationship between CSR associations and purchase intention. Interestingly, authors show that CSR associations moderate the link between brand awareness and consumer purchase intention. Based on the research, some recommendations are made to companies that produce organic milk products.
A note on local commutators in division rings with involution
Mai Hoang Bien 대한수학회 2019 대한수학회보 Vol.56 No.3
In this paper, we consider a conjecture of I. N. Herstein for local commutators of symmetric elements and unitary elements of division rings. For example, we show that if $D$ is a finite dimensional division ring with involution $\star$ and if $a\in D^*=D\backslash\{0\}$ such that local commutators $axa^{-1}x^{-1}$ at $a$ are radical over the center $F$ of $D$ for every $x\in D^*$ with $x^\star=x$, then either $a\in F$ or $\dim_{F}D= 4$.
Hoang, Mai Ha,Kim, Youngmee,Kim, Minsik,Kim, Kyung Hwan,Lee, Tae Wan,Nguyen, Duc Nghia,Kim, Sung‐,Jin,Lee, Kwangyeol,Lee, Suk Joong,Choi, Dong Hoon WILEY‐VCH Verlag 2012 Advanced Materials Vol.24 No.39
<P><B>Highly conjugated porphyrin derivatives, H<SUB>2</SUB>TP and ZnTP, are synthesized.</B> J‐aggregations of the H‐aggregated dimeric porphyrin pairs are clearly observed by their single crystal structures that facilitate slip‐stacked charge transport phenomenon. In particular, their SC‐FETs show the highest field‐effect mobilities of 0.85–2.90 cm<SUP>2</SUP> V<SUP>−1</SUP>s<SUP>−1</SUP>. Furthermore, the ZnTP‐based OPT displays a dramatic photoinduced current enhancement with a high photoresponsivity of 22 000 A W<SUP>−1</SUP> under a very low light intensity (5.6 m W cm<SUP>−2</SUP>).</P>
The Effect of Technology Spillover on Business Efficiency: A Case Study in Vietnam
Mai Lan PHUNG,Vu Hiep HOANG,Thi Thanh Huyen NGUYEN,Thi Thanh Van PHAM,Viet Tien TRAN,Van Hoa HOANG 한국유통과학회 2021 The Journal of Asian Finance, Economics and Busine Vol.8 No.5
The main objective of this study is to examine the interactive effect of technology spillover channels on business efficiency within the case study of manufacturing industry of Vietnam during the period from 2012 to 2018. The research model was developed with business efficiency as dependent variable and the relevant factors affecting the technology spillover capacity as independent variables. With a sample of 2,776 cross-sectional enterprises, panel data analysis approach was adopted to estimate the impact of technology spillover issue. Different spillover channels were also included in the analysis to enhance the empirical result. The study reveals that technology spillovers positively influence manufacturing business efficiency, in which horizontal spillover channel produces negative impact and vertical spillover channel, creates positive impact. Several factors that negatively affect the technology spillover capacity of businesses could be mentioned such as limited skills and experiences of workers, methods of implementing R&D, and the existence of FDI enterprises. Meanwhile, the rise of other factors related to joint-venture activities can help to increase the technology spillover capacity of businesses. In addition, skill and experience transfer makes a partial impact since this variable only positively affect the vertical spillover channel and provide no evidence of impact regarding horizontal spillover channel model.
Hoang Phuong Mai 경성대학교 한국한자연구소 2016 한자연구 Vol.0 No.14
Based on the reference achievement scholars before, combined with the actual survey results on Nom Tay documents currently stored in Institute of Sino-Nom Studies, conducted article comparing other cases face each other and are similar in structure between the written word: Nom of the Kinh and Tay ethnic group in Vietnam with the letter of the Zhuang ethnic blocks (Guangxi, China). This indicates that, basically 3 types of this writing there are a lot of similarities in terms of composition, the differences are very small and specific characteristics. This sector should be studied in depth and hopefully more will have interesting results in the future.