The Role of Investment Attraction in Vietnamese Industrial Parks and Economic Zones in the Process of International Economic Integration

Nguyen,Tien Dzung,Nguyen,Anh Tuan,Do,Phu Tran Tinh 한국유통과학회 2019 KODISA ICBE (International Conference on Business Vol.2019 No.-

This study aims to assess the attraction of foreign direct investment in Vietnamese economic zones (including industrial zones and economic zones). The main research method used are synthesis and comparison analysis based on the data collected from the surveyed group comprising of enterprises operating in the economic zones in the Middle (Chu Lai, Nhon Hoi, Dung Quat) and the Southern (the largest island: Phu Quoc). After conducting surveys, research results show that there is a difference between the assessment and the level to meet the requirements of investors with business environment, expressed through the following criteria: (1) the infrastructure; (2) quality of public services; (3) preferential policies; (4) labor; (5) market; and (6) social services. Based on the assessment of the identified criteria, this paper had suggested six number of recommendations to promote the role of attracting foreign direct investment capital into the economic zones in Vietnam: (1) implementing the one-stop-shop policy; (2) continuing to improve the infrastructure of economic zones; (3) prevent and ensure the security of economic zones; (4) implementing vocational training activities to improve quality of human resources; (5) development of supporting industries; (6) raising the quality of capital invested in the economic zone.

Effect of thermal annealing on the ac impedance of Co(75)/Al2O3 (2.3)/Co(5.0)/Al2O3 (2.3)/Co(50) double-barrier MTJs

Nguyen Tuan Anh,Nguyen Anh Tuan,Nguyen Tuyet Nga,Nguyen Anh Tue,Giap Van Cuong 한국물리학회 2014 Current Applied Physics Vol.14 No.10

Double-barrier magnetic tunnel junctions (DBMTJs) were prepared from Co(75 nm)/Al2O3(2.3 nm)/ Co(5 nm)/Al2O3(2.3 nm)/Co(50 nm) sputtering pentalayer films. The ac electrical properties of asdeposited DBMTJs and those annealed in a vacuum at 100e350 C for 30 min were then investigated using a complex impedance spectroscopic technique. The ac impedance responses as a function of annealing temperature were further analyzed based on Maxwell's layered dielectric barrier and Maxwell eWagner capacitor models after considering the DBMTJs as having double-capacitor-type structures. The effect of thermal annealing on the ac transport behavior of the DBMTJs was interpreted by examining the equivalent electric circuits fitted to Nyquist plots of each different sample. The effects were found to be due to changes in the structural characteristics in both bulk and interface morphologies of Co and Al2O3 layers. The structural morphology determined the different ac transport modes that occurred in the DBMTJs.

Inverse MR and Dual-AMR Phenomena in Co/CoO/Ag/Co Sandwiches

Nguyen Anh Tuan,Luong Van Su,Hoang Quoc Khanh,Nguyen Anh Tue,Nguyen Thi Luyen 한국물리학회 2018 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.72 No.7

Band-form Co/CoO/Ag/Co sandwiches were prepared using radio-frequency magnetron sputtering. The sandwiches had rather thick Co (tCO = 63 nm) and Ag (tAg = 2 ÷ 65 nm) layers and a super-thin paramagnetic cobalt monoxide (CoO) layer (< 1 nm) inserted in the Co/Ag interface. The sandwiches exhibited anomalous magnetoresistance (MR) behavior depending on the tAg value. Inverse magnetoresistance (IMR) effect was observed only at thin tAg values of 2 nm and 6 nm, whereas the dual-anisotropic MR (dual-AMR) occurred at thicker tAg values of 12 nm, 25 nm and 65 nm. A superposition of the dual-AMR and the weak IMR effects was obtained at the thickest Ag layer of 65 nm. The origin of these anomalous MR behaviors was discussed to show the prominent role of the CoO layer and large thickness of the Co and Ag layers.

Detection of pathogenic microorganisms using biosensor based on multi-walled carbon nanotubes dispersed in DNA solution

Nguyen Thi Thuy,Phuong Dinh Tam,Mai Anh Tuan,Anh-Tuan Le,Le Thi Tam,Vu Van Thu,Nguyen Van Hieu,Nguyen Duc Chien 한국물리학회 2012 Current Applied Physics Vol.12 No.6

The present paper introduces a facile and cost-effective route for the direct dispersion of multi-walled carbon nanotubes (MWCNTs) in DNA solution. Their application in detecting Escherichia coli O157:H7using DNA biosensorwas demonstrated. The dispersion state of theMWCNTswas characterized via UVeVis spectroscopy, transmission electron microscopy, and field emission scanning electron microscopy. The interaction between DNA sequence and the MWCNTs was investigated using Raman spectroscopy and Fourier transform infrared spectroscopy. As-obtainedMWCNT solutionwas used in the preparation of DNA sensor. Results revealed that the developed DNA sensor can detect a DNA target as low as 1 nM in a buffer solution. The sensitivity of the DNA sensor reached approximately 0.19 nM/mV. The effect of dispersion parameters, including pH values, DNA concentration, ion strength, and sonication time, on sensor response was also studied. TheDNA sensor can respondwell to 120 min of sonication time, a pH value of 9, and 20 mM of DNA sequence concentration. The results of the present study showed a potential application of the DNA sensor in the detection of Escherichia coli O157:H7.

A Comprehensive Sensitivity Analysis of a Data Center Network with Server Virtualization for Business Continuity

Nguyen, Tuan Anh,Min, Dugki,Park, Jong Sou Hindawi Limited 2015 Mathematical problems in engineering Vol.2015 No.-

<P>Sensitivity assessment of availability for data center networks (DCNs) is of paramount importance in design and management of cloud computing based businesses. Previous work has presented a performance modeling and analysis of a fat-tree based DCN using queuing theory. In this paper, we present a comprehensive availability modeling and sensitivity analysis of a DCell-based DCN with server virtualization for business continuity using stochastic reward nets (SRN). We use SRN in modeling to capture complex behaviors and dependencies of the system in detail. The models take into account (i) two DCell configurations, respectively, composed of two and three physical hosts in a DCell0unit, (ii) failure modes and corresponding recovery behaviors of hosts, switches, and VMs, and VM live migration mechanism within and between DCell0s, and (iii) dependencies between subsystems (e.g., between a host and VMs and between switches and VMs in the same DCell0). The constructed SRN models are analyzed in detail with regard to various metrics of interest to investigate system’s characteristics. A comprehensive sensitivity analysis of system availability is carried out in consideration of the major impacting parameters in order to observe the system’s complicated behaviors and find the bottlenecks of system availability. The analysis results show the availability improvement, capability of fault tolerance, and business continuity of the DCNs complying with DCell network topology. This study provides a basis of designing and management of DCNs for business continuity.</P>

Cloud-in-the-loop simulation: A cloud-based digital twin HW/SW framework for multi-mode AI control simulation of eVTOL KADA-UAM Personal Aerial Vehicles

Tuan Anh Nguyen(투안안),Jueying Li(이각영),Minseok Jang(장민석),Aye Aye Maw(아이아이모),Vinh Pham(빈팜),Jae-Woo Lee(이재우) 한국항공우주학회 2022 한국항공우주학회 학술발표회 논문집 Vol.2022 No.4

DYNAMIC MODELING OF FRICTION CHARACTERISTIC BETWEEN PILE AND SOIL

TUAN, NGUYEN ANH,NGAN, NGUYEN HONG 경북대학교 트라이볼로지연구소 2001 INTERNATIONAL SYMPOSIUM ON HIGH PERFORMANCE OF TRI Vol.2001 No.-

The mechanical properties, fracture behaviors and micro-mechnism of damage have been studied for three spheroidized steels. It is shown that void formation and growth induced by decohesion at the interface between the ferrite matrix and non-metallic particles or by particle cracking are the main reasons for the failure of these materials during plastic deformation. Experimental results show that the void volume fractions of these materials increase as strain increases, with the increasing rate being larger for the material with more carbide particles. Analytical expressions of strain hardening exponent and fracture strain for plastically damaged materials with second-phase particles are derived, and shown to be in good agreement with experimental data.

Multiple Feeding Strategy for Phase Transformation of GMP in Continuous Couette–Taylor Crystallizer

Nguyen, Anh-Tuan,Joo, Yong Lak,Kim, Woo-Sik American Chemical Society 2012 Crystal Growth & Design Vol.12 No.6

<P>A continuous Couette–Taylor (CT) crystallizer with a multiple feed mode was developed to promote the phase transformation of guanosine 5-monophosphate (GMP). In drowning-out crystallization, amorphous GMP is initially precipitated and then transformed into hydrate GMP crystals via the spontaneous nucleation of hydrate crystals and consecutive dissolution of the amorphous GMP and growth of hydrate GMP crystals. Importantly, the multiple feeding strategy had a significant accelerating effect on the phase transformation process, resulting in the complete conversion of the amorphous GMP into hydrate crystals within an overall mean residence time of 2.5 min, even with a high GMP feed concentration of 152.8 g/L and low rotation speed of 300 rpm. Thus, the phase transformation in the continuous CT crystallizer with the multiple feed mode (feeding mode IV) was at least 2 times faster than the phase transformation with the conventional feeding mode (feeding mode I), and 10 times faster when compared to the phase transformation in a continuous MSMPR crystallizer. The effectiveness of the multiple feeding mode for the phase transformation can be explained in terms of independently controlling the supersaturation, mean residence time, seeding effect, and mass transfer rates in each region of CT crystallizer depending on the multiple feeding strategy and feeding distribution ratio.</P><P>The multiple feeding strategy had a significant accelerating effect on the phase transformation process, resulting in the complete conversion of the amorphous GMP into hydrate crystals within an overall mean residence time of 2.5 min, even with a high GMP feed concentration of 152.8 g/L and low rotation speed of 300 rpm. This result indicated that the phase transformation in the continuous Couette−Taylor crystallizer with the multiple feed mode (feeding mode IV) was at least 2 times faster than the phase transformation with the conventional feeding mode (feeding mode I), and 10 times faster when compared to the phase transformation in a continuous MSMPR crystallizer.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/cgdefu/2012/cgdefu.2012.12.issue-6/cg201361e/production/images/medium/cg-2011-01361e_0008.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/cg201361e'>ACS Electronic Supporting Info</A></P>

Viet Tropical climate Its parameters Influence on the Wear of cast iron

Tuan, Nguyen Anh,Hung, Pham Van ENGINEERING TRIBOLOGY RESEARCH INSTITUTE KYUNGPOOK 2000 INTERNATIONAL SYMPOSIUM ON HIGH PERFORMANCE OF TRI Vol.2000 No.-

The influence of air environment on the wear of machine parts was investigated by comparing measure wear for friction pairs of different relative humidify. With changing humidity, the wear of cast iron materials has different results. However the relative humidity is not complete so that to study the effect of different factors of ambient air. The temperature and the air pollution are very important compositions of environment. So when to study the effect of atmosphere on the wear cast iron material, the experiments have performed in the conditions of changing humidity, temperature and beginning to be interested in the some polluted factors.

Spatially Adaptive Noise Removal Algorithm Using Local Statistics

NGUYEN, Tuan-Anh,SONG, Won-Seon,HONG, Min-Cheol The Institute of Electronics, Information and Comm 2011 IEICE transactions on fundamentals of electronics, Vol.ea94 No.1

<P>In this letter, we propose a spatially adaptive noise removal algorithm using local statistics. The proposed algorithm consists of two stages: noise detection and removal. In order to solve the trade-off between the effective noise suppression and the over-smoothness of the reconstructed image, local statistics such as local maximum and the local weighted activity is defined. With the local statistics, the noise detection function is defined and a modified Gaussian filter is used to suppress the detected noise components. The experimental results demonstrate the effectiveness of the proposed algorithm.</P>