http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Neighbor-Interactive Bee Colony for Problems with Local Structures
HONG, Phuc Nguyen,AHN, Chang Wook,JEONG, Jaehoon (Paul) 'Institute of Electronics, Information and Communi 2017 IEICE transactions on fundamentals of electronics, Vol.ea100 No.9
<P>In this letter, we integrate domain information into the original artificial bee colony algorithm to create a novel, neighbor interactive bee colony algorithm. We use the Hamming distance measure to compute variable dependency between two binary variables and employ the Gini correlation coefficient to compute variable relation between integer variables. The proposed optimization method was evaluated by minimizing binary Ising models, integer Potts models, and trapped functions. Experimental results show that the proposed method outperformed the traditional artificial bee colony and other meta-heuristics in all the testing cases.</P>
NGUYEN, Phi-Hung,TSAI, Jung-Fa,NGUYEN, Hong-Phuc,NGUYEN, Viet-Trang,DAO, Trong-Khoi Korea Distribution Science Association 2020 The Journal of Asian Finance, Economics and Busine Vol.7 No.12
The COVID 19 pandemic has led to a new global recession and is still causing a lot of issues because of the delays in the employment of people. This scenario has severe consequences for many countries' labor markets in the world. This problem's complexity and importance requires an integrated method of subjective and objective evaluation rather than intuitive decisions. This research aims to investigate sustainable indexes for assessing the unemployment problem by using a Multi-Criteria Decision-Making Model (MCDM). Grey theory and Decision Making Trial and Evaluation Laboratory (GDEMATEL) are deployed to transform the experts' opinions into quantitative data. The analysis based on 20 crucial criteria is employed to determine the weights of sustainability of unemployment problems. The results revealed that the top ten of determinants are Economic growth, Industrialization, Foreign direct investment, Real GDP per capita, Education level, Trade Openness, Capacity Utilization Rate, Urbanization, Employability skills, Education system expansion, which have the most significant effects on the unemployment rate under COVID 19 impacts. Furthermore, GDEMATEL could effectively assess the sustainable indicators for unemployment problems in "deep and wide" aspects. The study proposes the Grey MCDM model, contributes to the literature, provides future research directions, and helps policymakers and researchers achieve the best solutions to the unemployment problems under "economic shocks."
Magnetoresistance Effect in La0.7Sr0.3MnO3 Thin Films Fabricated by Using Pulsed Laser Deposition
Nguyen Van Dai,Nguyen Chi Thuan,Le Van Hong,Nguyen Xuan Phuc 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.52 No.5
La0:7Sr0.₃MnO₃ thin films were fabricated onto (100) n-Si substrates by using pulsed laser deposition (PLD). The thickness of the lms was controlled from 30 nm to 100 nm by varying deposition time. The deposited lms were then annealed at 600℃ for 5 h. Room-temperature X-ray patterns verifed that the lms had a La0:7Sr0:3MnO3 single phase as did the target. The crystalline orientation of the lms was in uenced by the lms thickness. Thinner lms were more oriented in the (104) direction. The Magnetoresistance (MR) measured at 300 K for all the lms exhibited a pure DE behavior that depended on the films thickness. A nonlinear eld dependence of the magnetoresistance was observed in the temperature region far below TC. This obtained result could not be explained by the DE mechanism. Fitting experimental data to the spin polarized tunneling model, we attributed the dominated low-field MR below TC to spin polarized tunneling between grain boundaries. La0:7Sr0.₃MnO₃ thin films were fabricated onto (100) n-Si substrates by using pulsed laser deposition (PLD). The thickness of the lms was controlled from 30 nm to 100 nm by varying deposition time. The deposited lms were then annealed at 600℃ for 5 h. Room-temperature X-ray patterns verifed that the lms had a La0:7Sr0:3MnO3 single phase as did the target. The crystalline orientation of the lms was in uenced by the lms thickness. Thinner lms were more oriented in the (104) direction. The Magnetoresistance (MR) measured at 300 K for all the lms exhibited a pure DE behavior that depended on the films thickness. A nonlinear eld dependence of the magnetoresistance was observed in the temperature region far below TC. This obtained result could not be explained by the DE mechanism. Fitting experimental data to the spin polarized tunneling model, we attributed the dominated low-field MR below TC to spin polarized tunneling between grain boundaries.
A New Cathode for Reduced-Temperature Molten Carbonate Fuel Cells
Nguyen, Hoang Viet Phuc,Kang, Min Goo,Ham, Hyung Chul,Choi, Sun Hee,Han, Jonghee,Nam, Suk Woo,Hong, Seong-Ahn,Yoon, Sung Pil The Electrochemical Society 2014 Journal of the Electrochemical Society Vol.161 No.14
<P>Oxygen solubility is the rate-determining step (RDS) for the reduction reaction on the cathodes of molten carbonate fuel cells (MCFCs), especially at low operating temperatures below 600°C. The poor wetting property of the mixed ionic and electronic conductor (MIEC) coating, such as BYS (Bi<SUB>1.5</SUB>Y<SUB>0.3</SUB>Sm<SUB>0.2</SUB>O<SUB>3-δ</SUB>) on the NiO cathode, to the liquid electrolyte creates openings where oxygen absorption and dissociation take place to provide more oxide ionic species to electrochemical reaction sites (ERSs). Therefore, poor wetting MIEC-coated cells showed a much higher power density compared to standard cells, with a factor of 1.4 at the low operating temperature of 550°C. Long-term operation of 2500 hours with a low voltage loss of 9 mV suggests that BYS is a promising alternative cathode material for molten carbonate fuel cells.</P>
Electromigration with enhanced green emission in the titanium dioxide nanotube/graphene composite
Tri Tuan Nguyen,Tran Thanh Tung,Dusan Losic,Luu Thi Lan Anh,Le Hong Phuc,Xuan Sang Nguyen 한국물리학회 2019 Current Applied Physics Vol.19 No.10
One of the most studied photoluminescence emission peaks of anatase titanium dioxide (TiO2) is green, located at about 520 nm, which is assigned to the radiative recombination between a mobile electron in the conduction band and oxygen vacancy defect as a trapped hole in the bandgap. Composite materials of TiO2 with graphene are normally shown by the gradual quenching of photoluminescence intensity as a result of carrier lifetime extension, which is important to enhance photocatalytic activity. Herein we report an observation of the intensity enhancement of the green PL emission in a composite TiO2 nanotube (TNT) and graphene produced through facile hydrothermal synthesis. The heterojunction formation of graphene and TNT makes the excited photoelectrons easy to diffuse from TNT to graphene. Hence, the recombination rate of mobile electrons in graphene and trapped holes located on the nanotube surface is enhanced due to the high mobility of electrons in graphene.