The Effect of Trade Integration on Business Cycle Synchronization in East Asia

NGUYEN, Vinh Thi Hong,HOANG, Thuy Thi Thanh,NGUYEN, Sang Minh Korea Distribution Science Association 2020 The Journal of Asian Finance, Economics and Busine Vol.7 No.8

The paper aims to investigate the impact of trade integration on business cycle synchronization for the East Asian countries during 2005- 2017 based on the endogeneity hypothesis of Optimum Currency Area criteria. We test the determinants of business cycles by calculating bilateral trade, financial integration, and business cycle synchronization. Applying the system Generalized Method of Moments for dynamic panel data models, the results show that business cycle synchronization is highly associated with trade and financial integration. These findings confirm the endogeneity hypothesis that more trade integration will mitigate asymmetric shocks, and have a positive impact on the business cycle synchronization. The increased trade intensity and financial linkage lead to more correlated business cycles in East Asia. Apart from trade and financial integration, the trade structure differential, monetary policy similarity also influence the business cycle comovement. The significantly negative impact of trade structure differential on business cycle synchronization suggests that countries with less similar structures are more likely to undergo asymmetric shocks. The results also indicate that monetary policy matters for output comovement. This study recommends that the East Asian countries should focus on bilateral trade as well as financial integration with each other to reap benefits from the integration process.

Predation rates of Neoseiulus womersleyi (Schicha) and Euseius ovalis (Evans) feeding on tetranychid mites (Acari: Phytoseiidae, Tetranychidae)

Thanh Vinh Nguyen,Chain-Ing Thomas Shih 한국응용곤충학회 2011 Journal of Asia-Pacific Entomology Vol.14 No.4

Predation rates of Neoseiulus womersleyi and Euseius ovalis feeding on eggs, larvae, or protonymphs of Tetranychus urticae, Tetranychus kanzawai, or Oligonychus mangiferus were measured in a chamber at 25 °C. N. womersleyi immatures consumed 9.73 T. urticae eggs, 13.53 larvae, or 11.57 protonymphs, while gravid females consumed 12.13 T. urticae eggs, 14.37 larvae, or 12.07 protonymphs daily. Female N. womersleyi consumed a total of 218.12 T. urticae eggs, 260.85 larvae, or 222.33 protonymphs, while male N. womersleyi consumed a total of 96.39 T. urticae eggs, 112.23 larvae, or 99.65 protonymphs. When O. mangiferus larvae or protonymphs were offered to E. ovalis, immatures consumed 18.57 larvae or 17.47 protonymphs. Gravid females consumed 16.83 larvae or 12.83 protonymphs daily, with a total of 330.68 larvae or 252 protonymphs. Adult E. ovalis males consumed fewer O. mangiferus larvae (107.69) or protonymphs (91.51) than females. Conversion rate of predation to reproduce was expressed as “Food–reproduction exchange rate” of N. womersleyi was lower on T. urticae than on T. kanzawai. E. ovalis showed a higher food–reproduction exchange rate on O. mangiferus than on T. urticae. The results suggest that N. womersleyi and E. ovalis feed mainly on larvae and protonymphs rather than on the eggs of T. urticae, T. kanzawai, and O. mangiferus. We recommended using T. urticae eggs are suitable food for mass rearing for both N. womersleyi and E. ovalis.

Development of Neoseiulus womersleyi (Schicha) and Euseius ovalis (Evans) feeding on four tetranychid mites (Acari: Phytoseiidae, Tetranychidae) and pollen

Thanh Vinh Nguyen,Chain-Ing Thomas Shih 한국응용곤충학회 2010 Journal of Asia-Pacific Entomology Vol.13 No.4

The development of the predatory mites, Neoseiulus womersleyi (Schicha) and Euseius ovalis (Evans), feeding on four tetranychid mites (Tetranychus urticae, Tetranychus kanzawai, Oligonychus mangiferus, Panonychus citri), maize pollen or Chinese loofah pollen was studied at 25 °C. Immature stages of N. womersleyi feeding on T. urticae and T. kanzawai had shorter developmental duration (4.71 and 5.02 days for females, 4.77 and 5.19 days for males, respectively) than those feeding on other food sources. Immature stages of E. ovalis females feeding on O. mangiferus and T. urticae developed in 4.99 and 5.13 days, respectively, the shortest developmental duration measured. Immature stages of E. ovalis males feeding on O. mangiferus and T. urticae developed in 5.12 and 5.37 days, respectively. The longevity of N. womersleyi males (13.31 to 14.51 days) and females (17.67 to 21.81 days) feeding on T. urticae, T. kanzawai or maize pollen was longer than the longevity of N. womersleyi feeding on O. mangiferus, P. citri or loofah pollen. E. ovalis males (12.91 to 16.74 days) and females (16.24 to 23.77 days) feeding on O. mangiferus, T. urticae or maize pollen lived longer than E. ovalis males and females feeding on T. kanzawai, P. citri or loofah pollen.

Space Vector Modulation Scheme for Three-Level T-Type Quasi-Switched Boost Inverter to Reduce Common Mode Voltage

Vinh-Thanh Tran,Duc-Tri Do,Minh-Khai Nguyen,Dinh-Tuyen Nguyen 전력전자학회 2019 ICPE(ISPE)논문집 Vol.2019 No.5

In this paper, a space vector pulse-width modulation (SVPWM) control scheme for the three-level quasi-switched boost T-type inverter (TL-qSBT2I) to reduce common mode is presented. The magnitude and slew rate of common-mode voltage (CMV) are reduced by using the proposed method. By properly selecting the shoot-through (ST) phase, the ST states are inserted within a small vector so that the active states and output voltage are unchanged. In this method, the ST duty cycle is kept constant to obtain the modulation index as high as possible while the duty cycles of the two additional switches are the control variables. The proposed method can mitigate the peak value of CMV up to 50% and the RMS value up to 35.3% as compared to the conventional SVPWM control method. To verify the operating principle of the TL-qSBT<SUP>2</SUP>I, the simulation and experimental results are shown.

Al₂O₃/SiON stack layers for effective surface passivation and anti-reflection of high efficiency n-type c-Si solar cells

Nguyen, Huong Thi Thanh,Balaji, Nagarajan,Park, Cheolmin,Triet, Nguyen Minh,Le, Anh Huy Tuan,Lee, Seunghwan,Jeon, Minhan,Oh, Donhyun,Dao, Vinh Ai,Yi, Junsin Institute of Physics 2017 Semiconductor science and technology Vol.32 No.2

<P>Excellent surface passivation and anti-reflection properties of double-stack layers is a prerequisite for high efficiency of n-type c-Si solar cells. The high positive fixed charge (<I>Q</I> <SUB>f</SUB>) density of N-rich hydrogenated amorphous silicon nitride (a-SiN<SUB>x</SUB>:H) films plays a poor role in boron emitter passivation. The more the refractive index (<I> <B>n</B> </I>) of a-SiN<SUB>x</SUB>:H is decreased, the more the positive <I>Q</I> <SUB>f</SUB> of a-SiN<SUB>x</SUB>:H is increased. Hydrogenated amorphous silicon oxynitride (SiON) films possess the properties of amorphous silicon oxide (a-SiO<SUB>x</SUB>) and a-SiN<SUB>x</SUB>:H with variable <I> <B>n</B> </I> and less positive <I>Q</I> <SUB>f</SUB> compared with a-SiN<SUB>x</SUB>:H. In this study, we investigated the passivation and anti-reflection properties of Al<SUB>2</SUB>O<SUB>3</SUB>/SiON stacks. Initially, a SiON layer was deposited by plasma enhanced chemical vapor deposition with variable <I> <B>n</B> </I> and its chemical composition was analyzed by Fourier transform infrared spectroscopy. Then, the SiON layer was deposited as a capping layer on a 10 nm thick Al<SUB>2</SUB>O<SUB>3</SUB> layer, and the electrical and optical properties were analyzed. The SiON capping layer with <I> <B>n</B> </I>?=?1.47 and a thickness of 70 nm resulted in an interface trap density of 4.74?=?10<SUP>10</SUP> cm<SUP>−2</SUP> eV<SUP>−1</SUP> and <I>Q</I> <SUB>f</SUB> of −2.59?=?10<SUP>12</SUP> cm<SUP>−2</SUP> with a substantial improvement in lifetime of 1.52 ms after industrial firing. The incorporation of an Al<SUB>2</SUB>O<SUB>3</SUB>/SiON stack on the front side of the n-type solar cells results in an energy conversion efficiency of 18.34% compared to the one with Al<SUB>2</SUB>O<SUB>3</SUB>/a-SiN<SUB>x</SUB>:H showing 17.55% efficiency. The short circuit current density and open circuit voltage increase by up to 0.83 mA cm<SUP>−2</SUP> and 12 mV, respectively, compared to the Al<SUB>2</SUB>O<SUB>3</SUB>/a-SiN<SUB>x</SUB>:H stack on the front side of the n-type solar cells due to the good anti-reflection and front side surface passivation.</P>

A Numerical Calculation of the Nuclear Spin-Parity and Magnetic Moment Based on the Single-Particle Shell Model

Nguyen Ngoc Duy,Latsamy Xayavong,Nguyen Kim Uyen,Vinh Nguyen Thanh Pham,Tran Viet Nhan Hao 한국물리학회 2019 새물리 Vol.69 No.10

Nuclear physics is an obligatory subject for the general physics program of undergraduates in most of the natural science universities worldwide. In nuclear physics, the shell model is one of the most important models, and is well used to determine the spin-parity and the magnetic moment of a nucleus. Over ten years of teaching general physics, we have realize that most undergraduate students find calculating these parameters by using this shell model to be difficult due to the classification of the subshells and the intrinsic spin of nucleons. With the hope to help these students, in the present study, we introduce a graphical-user-interface (GUI) program to execute our selfdeveloped Shell Model Calculator (SMC) code written in the Visual Basic 6.0 (VB6) programming language. Our SMC validation results for the quantum quantities in a series of nuclei Z = 1 - 20 were compared with experimental data and found to be in good agreement. In general, we successfully developed an SMC program that can be used for teaching, learning, and researching nuclear physics in universities.

베트남의 홍수 지역을 위한 플로팅 주택에 관한 연구

뉴엔탄빙(Nguyen, Thanh Vinh),전영일(Jeon, Young-Il) 대한건축학회 2011 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.31 No.1(계획계)

이온성 폴리머-금속 복합재료 작동층을 사용한 플랩 밸브 마이크로 펌프의 설계, 개발 및 특성 규명

구옌탄텅(Thanh Tung Nguyen),구남서(Nam Seo Goo),구옌빈칸(Vinh Khanh Nguyen),유영태(Youngtai Yoo) 한국항공우주학회 2007 韓國航空宇宙學會誌 Vol.35 No.4

본 연구에서는 이온성 폴리머-금속 복합재료 (IPMC) 작동기를 사용한 플랩 밸브 마이크로 펌프의 설계, 제작 및 실험적 특성 규명을 수행하였다. 나피온/실리케이트 층과 나피온/실리카 나노복합재료를 기반으로 한 다층형 IPMC를 마이크로 펌프의 작동층으로 사용하였다. 마이크로 펌프의 핵심 요소인 IPMC 다이아프램의 주위를 유연한 폴리디메틸 실옥산(PDMS)을 사용하여 지지하도록 함으로써 상당히 큰 작동 변위를 내도록 설계하였다. 이렇게 개발된 마이크로 펌프의 크기는 20×20×5㎣ 이고, 최대 유량은 760 ㎕/min, 최대 배압은 1.5 ㎪이었다. 본 연구에서 개발한 마이크로 펌프는 간단하고 효율적인 설계를 수행하여 제작이 용이할 뿐 아니라, 동작 전압이 1-3V라는 장점이 있다. In this paper, a flap valve micropump with an ionic polymer-metal composite (IPMC) actuator was designed, fabricated, and experimentally characterized. A multilayered IPMC based on Nafion/layered silicate and Nafion/silica nanocomposites was fabricated for the actuation section of the micropump. The IPMC diaphragm, a key element of the mircopumo, was designed so that the IPMC actuator was supported by a flexible polydimethylsiloxane (PDMS) structure at its perimeter. This design feature enabled a significantly high displacement of the IPMC diaphragm. The overall size of the micropump is 20×20×5 ㎣. Water flow rates of up to 760 ㎕/min and a maximum backpressure of 1.5 ㎪ were recorded. A significant advantage of the proposed micropump is its low driven voltage from only 1-3 V. In addition, a simple and effective design, and an ease of manufacturing are other advantages of the present micropump.

Chemical constituents from Vietnamese mangrove <i>Calophyllum inophyllum</i> and their anti-inflammatory effects

Van Thanh, Nguyen,Jang, Hyun-Jae,Vinh, Le Ba,Linh, Kieu Thi Phuong,Huong, Phan Thi Thanh,Cuong, Nguyen Xuan,Nam, Nguyen Hoai,Van Minh, Chau,Kim, Young Ho,Yang, Seo Young Elsevier 2019 Bioorganic chemistry Vol.88 No.-

<P><B>Abstract</B></P> <P>In a search for anti-inflammatory activity in resources from Vietnamese mangroves, we found that a methanolic extract from the leaves of <I>Calophyllum inophyllum</I> (CIL) showed significant anti-inflammatory effects <I>in vitro</I>. Using various chromatographic techniques, we subsequently isolated 12 compounds (<B>1</B>–<B>12</B>) from a methanolic extract of CIL, including two novel compounds (<B>1</B>–<B>2</B>). The inhibitory effects of these compounds on lipopolysaccharide-induced nitric oxide (NO) production in RAW264.7 cells were also evaluated. Compound <B>1</B> significantly suppressed NO production (IC<SUB>50</SUB> = 2.44 ± 0.88 µM), the secretion of pro-inflammatory cytokines (including interleukin-1 beta and tumor necrosis factor alpha), and the expression of inducible nitric oxide synthase through downregulation of nuclear factor-kappa-B signaling cascades. These results suggest that <I>C. inophyllum</I> leaves might be a useful resource for the development of drugs for the treatment of inflammation.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Twelve compounds were isolated from Vietnamese mangrove <I>Calophyllum inophyllum</I>. </LI> <LI> Two new compounds <B>1</B> and <B>2</B> were determined by spectroscopic methods. </LI> <LI> Compound <B>1</B> showed significant anti-inflammatory activity. </LI> <LI> These results suggested that <I>C. inophyllum</I> might useful as the anti-inflammation drug. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>

A new rearranged abietane diterpene from Clerodendrum inerme with antioxidant and cytotoxic activities

Ba Vinh, Le,Thi Minh Nguyet, Nguyen,Young Yang, Seo,Hoon Kim, Jang,Thi Vien, Le,Thi Thanh Huong, Phan,Van Thanh, Nguyen,Xuan Cuong, Nguyen,Hoai Nam, Nguyen,Van Minh, Chau,Hwang, Inkyu,Ho Kim, Young Taylor & Francis Health Sciences 2018 NATURAL PRODUCT RESEARCH Vol.32 No.17