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( Tran Thi Thuy Nga ),권영환 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.0
In this study, we synthesize GAP-base particles as an adsorbent containing azide groups which are known as one of highly reactive groups and its ability to remove metal ions due to a strong coordination with these metal ions. The spherical particles containing azide groups are prepared by suspension method via a reaction of glycidyl azide polymer (GAP) and bis-propargyl succinate (BPS) and an aid of polyvinyl alcohol (PVA). Cu-free Click reaction occurs via azide groups of GAP and alkyne groups of BPS. The changing of agitation speed, concentration of PVA and content of organic phase affects to particle size and particle size distribution. The spherical shape and mechanical properties of particles are obtained by SEM and TGA, DMA, DSC measurements. The efficiency of removing metal ions is obtained by adsorption Hg2+ and Pb2+. Freundlich isotherm model is used to describe the adsorption process. GAP-base particle is the promising adsorbent for wastewater treatment containing metal ions.
( Tran Thi Thuy Nga ),서민영,권영환 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.1
In this study, we synthesized GAP-based particles contain functional azide groups on the surface as a polymeric adsorbent applied to remove metal ions. The stable particles were prepared by suspension method. Glycidyl azide polymer was crosslinked by bis-propargyl succinate via Cu-free Click reaction. Effect of suspension parameters were studied on particle size and partilce size distribution to provide control size of particles. The presence of azide groups on particles was showed at 2097 cm-1 through FTIR result and its spherical morphology was observed by microscope measurement with different sizes from 0.25-1.4mm. TGA results showed high thermal stability of particles through high decomposition temperature at 240°C. Adsorption experiment was studied on Hg(II), Pb(II) metal ions. Freundlich isotherm model was used to describe the heterogeneous adsorption between particles and Pb(II) while Linear isotherm model predicted the adsorption process for Hg(II).
Fabrication and Properties of Azide-containing Nanofibers Electrospun using PVAc/GAP mixtures
( Tran Thi Thuy Nga ),권영환 한국공업화학회 2018 한국공업화학회 연구논문 초록집 Vol.2018 No.0
Electrospinning technology is a simple and direct method for the fabrication of polymer nanofibers which are continuous polymer fibers ranging from several micrometers to several hundred nanometers. There are many types of nanofibers whose applications are in various fields, such as composites, protective clothing, biomedicines and drug delivery, filtration, and agriculture. In this study, the azide-containing nanofibers were fabricated using co-electrospinning PVAc/GAP/BPS solution, followed by Click reaction between GAP and BPS. The parameters of electrospinning process were controlled and then, click reaction was occurred at 50 °C. The morphology of nanofibers before and after click reaction were revealed by SEM result. In the future, we would like to point out the application of nanofiber in wastewater treatment by assembling nanofibers into membrane filtration, wherein PVAc nanofiber with azide functional groups as an adsorbent can remove heavy metal ions from contaminated water.
Banking Sector Depth and Economic Growth: Empirical Evidence from Vietnam
LE, Thi Thuy Hang,LE, Trung Dao,TRAN, Thi Dien,DUONG, Quynh Nga,DAO, Le Kieu Oanh,DO, Thi Thanh Nhan Korea Distribution Science Association 2021 The Journal of Asian Finance, Economics and Busine Vol.8 No.3
The Vietnamese economy is a developing country that has brought many opportunities and challenges for the banking system. Commercial banks have developed strongly from quality to quantity, which plays a vital role in developing the economy. They play an important role in capital formation, which is essential for the economic development of a country. They provide financial services to the general public and businesses, ensuring economic and social stability and sustainable growth of the economy. Therefore, the relationship between bank depth and economic growth is of importance in research. This paper used a VAR (Vector Autoregressive Models) estimator for time series data models. The data is collected quarterly from the first quarter of the year 2000 to 2020. The study uses the VAR model to examine the causal relationships of economic growth, growth in money supply expansion, private sector capital requirement, and banks' domestic credit. The results indicate a general short-run relationship between banking sector depth and economic growth with a positive connection, but in the long term, the relationship between these variables can be reversed because of other macro factors. The findings show the two-way causal relationship between GDP growth and banking depth factors. This research contributes to policy-making by underlining the banking sector depth determinants when setting regulations and policies to develop the banking sector.
서민영,( Tran Thi Thuy Nga ),권영환 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.1
고분자 나노섬유를 제조하는 여러 가지 방법 중 전기방사법은 넓은 표면적, 간편성, 저렴한 비용, 다양한 폴리머의 적용 등 다양한 장점이 있다. 이 연구에서는 높은 인장강도, 내구성, 탄성 등 우수한 기계적 성질을 나타내는 폴리우레탄과 가교제인 bis-propargyl-succinate(BPS)을 혼합한 후 전기방사법으로 나노섬유를 제조하였다. 폴리우레탄은 glycidyl azide polyol (GAP)와 toluene- 2.4-diisocyanate (TDI)를 사용해서 중합 반응하여 용매에 용해되고 높은 점도를 가진 폴리우레탄을 합성하였다. 그리고, 폴리우레탄과 BPS를 전기방사법에 적용하여 나노섬유를 형성한 후, 나노섬유 내에서 폴리우레탄과 BPS와의 Cu-free azide-alkyne Click 반응을 수행하여 보다 더 우수한 기계적 및 열적 성질을 갖는 나노섬유를 만들고자 하였다.
Tracking the establishment of local endemic populations of an emergent enteric pathogen
Holt, Kathryn E.,Thieu Nga, Tran Vu,Thanh, Duy Pham,Vinh, Ha,Kim, Dong Wook,Vu Tra, My Phan,Campbell, James I.,Hoang, Nguyen Van Minh,Vinh, Nguyen Thanh,Minh, Pham Van,Thuy, Cao Thu,Nga, Tran Thi Thu National Academy of Sciences 2013 PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF Vol.110 No.43
<P><I>Shigella sonnei</I> is a human-adapted pathogen that is emerging globally as the dominant agent of bacterial dysentery. To investigate local establishment, we sequenced the genomes of 263 Vietnamese <I>S. sonnei</I> isolated over 15 y. Our data show that <I>S. sonnei</I> was introduced into Vietnam in the 1980s and has undergone localized clonal expansion, punctuated by genomic fixation events through periodic selective sweeps. We uncover geographical spread, spatially restricted frontier populations, and convergent evolution through local gene pool sampling. This work provides a unique, high-resolution insight into the microevolution of a pioneering human pathogen during its establishment in a new host population.</P>
( The Thien Ho ),권영환,( Thi Thuy Nga Tran ) 한국공업화학회 2017 한국공업화학회 연구논문 초록집 Vol.2017 No.1
In this study, the time temperature superposition principle (TTSP) will be applied to obtain the master curves and predict life time of materials. The materials used in this study include three types of polyurethane (PU) composites based on hydroxyl-terminated polybutadiene (HTPB), polycaprolactone triol (PCL) and ether modified dimethylsiloxane (PDMS) as prepolymer and isophorone diisocyanate (IPDI) as curing agent. PU composites are prepared with four different volume particle contents ranging from 0 % to 75 %. Dynamic mechanical analyser (DMA) is used to evaluate the storage modulus, loss modulus, tan delta and glass transition temperature (Tg) for each PU composite to show time (frequency) and temperature dependent behavior on deformation. The master curve of storage modulus is generated for each PU composite samples and used to predict the life time of PU composites.
Factors Affecting the Internal Control System: A Case Study of Chemical Enterprises in Vietnam
Hoang Thanh NGO,Tung Dao NGUYEN,Nga Thuy Thi NGUYEN,Ha Ngoc DAO,Anh Phuong Tran VU 한국유통과학회 2021 The Journal of Asian Finance, Economics and Busine Vol.8 No.12
The article analyzes the impact of factors affecting the internal control system of chemical enterprises in Vietnam, providing more empirical evidence on factors affecting the system of internal control. Research data is collected in the form of face-to-face interviews and email interviews with managers and employees working in different positions, managers at all levels, chief accountants, and accountants of 52 chemical enterprises in Vietnam. The survey results collected 310 questionnaires. After eliminating the invalid questionnaires due to many blank cells, the authors chose to use 297 questionnaires. Quantitative research was carried out with SPSS 25 software. Research results show that Business Strategy, Organizational Structure, Organization’s perception of the instability of the external environment, and Organizational culture are the factors that positively affect the internal control system of chemical enterprises. This can be explained that, for chemical enterprises, Business strategy, Organizational structure, Organization’s perception of the instability of the external environment, and Good organizational culture will positively impact the internal control system of chemical enterprises. Based on the research results, the authors have proposed recommendations to enhance the effectiveness of the internal control system of chemical enterprises in Vietnam, thereby contributing to improving the performance of enterprises in the chemical Vietnamese.
Robot Supporting for Deaf and Less Hearing People
Nguyen Truong Thinh,Tuong Phuoc Tho,Tran Thi Thuy Nga 제어로봇시스템학회 2017 제어로봇시스템학회 국제학술대회 논문집 Vol.2017 No.10
This paper discusses the development of a service robot for translating spoken language text into signed languages and vice versa. The motivation for our study is the improvement of accessibility to public information announcements for deaf and less hearing people. The robot can translate Vietnamese sign language into speech and recognize Vietnamese/English speech to suitable gesture/sign language. The paper describes the use of service robot in a sign language machine translation system. Several sign language visualization methods were evaluated on the robot. In order to perform this study a machine translation service robot that uses display screen on robot as service-delivery device was developed as well as a 3D avatar. It was concluded that service robot are suitable service-delivery platforms for sign language machine translation systems.