REVITALIZATION STRATEGY OF KOREA'S SPECIAL TOURISM ZONES: FOCUSING ON QUY NHON STREET IN ITAEWON

Tran Minh Quy,Lee Young Seon,Lee In Hee,Kwak In Sin 한국베트남학회 2024 베트남연구 Vol.22 No.1

한국은 아시아 관광 산업의 선두 국가이며, 한국 정부는 효율적인 관광 발전에 초점을 맞춘 많은 정책을 시행해 왔다. ‘관광특구’라고 불리는 관광개발 정책은 국가와 지방자치단체가 전략적으로 지정해 활용하고 있다. 이러한 관광특구 개발정책은 지속적으로 국제관광객 유치에 도움을 주고 있다. 본 연구는 오랜 역사와 외국인 거리로 유명한 서울 용산구에 위치한 이태원 관광특구의 효과와 장점, 한계를 분석한다. 서울 이태원 지역의 ‘퀴논 거리’는 서울에서 베트남어로는 처음으로 명명된 유일한 거리이다. 본 연구에서는 AIDA 분석 모델을 활용하여 퀴논 거리 관광 진흥 전략을 제안한다. 본 연구의 의의는 코로나 19 팬데믹 이후 한국 관광특구의 효과적인 회복과 발전을 선도하고, 국내외 관광객, 특히 베트남 관광객에게 이태원 지역 퀴논거리 관광지를 알릴 수 있도록 돕는 데 있다. 서울 용산구를 방문하는 관광객들이 지난 30 년 동안 베트남과 한국 사이의 돈독한 관계의 중요성을 더 잘 이해하는 데 도움이 되길 바란다. South Korea is a leading country in Asia's tourism industry, and the Korean government has implemented many policies that focus on the development of efficient tourism. Tourism development policies called “Special Tourism Zones” have been designated and are used strategically by national and local governments. These special tourism zone development policies are helping to attract international tourists continuously. This study analyzes the effects, strengths, and limitations of the special tourism zone in Itaewon, located in Yongsan-gu, Seoul, which is famous for its long history and foreigner street. This study uses the AIDA analysis model to propose a strategy to promote tourism in Quy Nhon Street. “Quy Nhon Street” in the Itaewon area of Seoul is the only street in Seoul's capital that is specifically named in Vietnamese. The significance of this study is to lead the effective recovery and development of Korea's special tourism zones after the COVID-19 pandemic, and to help domestic and foreign tourists, especially Vietnamese tourists, to get to know Quy Nhon Street tourist attractions in the Itaewon area of Yongsan-gu, Seoul. This will help tourists better understand the significance of the strong relationship between Vietnam and Korea over the past 30 years.

Potentiodynamic Electrodeposition of CoSe₂ Films and Their Excellent Electrocatalytic Activity as Counter Electrodes for Dye-Sensitized Solar Cells

Quy, Vu Hong Vinh,Park, Jeong-Hyun,Kang, Soon-Hyung,Kim, Hyunsoo,Ahn, Kwang-Soon Electrochemical Society 2019 Journal of the Electrochemical Society Vol.166 No.10

<P>Cobalt selenide (CoSe<SUB>2</SUB>) thin films are successfully formed on F-doped SnO<SUB>2</SUB> (FTO) via a single step potentiodynamic electrodeposition process without any post treatment, and are utilized as counter electrodes (CEs) for dye-sensitized solar cells (DSSCs). The electrochemical behavior of the electrodeposited FTO/CoSe<SUB>2</SUB> films is examined through Tafel polarization, cyclic voltammetry, and electrochemical impedance spectroscopy measurements. The results indicate that the FTO/CoSe<SUB>2</SUB> films exhibit outstanding electrocatalytic ability and electrochemical stability toward the I<SUP>−</SUP>/I<SUP>−</SUP><SUB>3</SUB> redox couple. The optimized FTO/CoSe<SUB>2</SUB> film fully covers the FTO substrate and features a nanoporous structure of interconnecting nanocrystalline networks, which is beneficial for the diffusion of ions and provides numerous electrochemical active sites. The optimized DSSC using FTO/CoSe<SUB>2</SUB> as CE exhibits a significantly improved cell efficiency of 7.95% compared to that of the DSSC using FTO/Pt as CE (7.48%).</P>

Autonomous Stair Climbing Algorithm for a Small Four-Tracked Robot

Quy-Hung Vu,Byeong-Sang Kim,Jae-Bok Song 제어로봇시스템학회 2008 제어로봇시스템학회 국제학술대회 논문집 Vol.2008 No.10

In outdoor environments, mobility, adaptability and reliability of a robot are more important than its speed and precise trajectory. From a practical point of view, tracked robots have an advantage over wheeled robots in outdoor applications. The tracked robot is frequently operated by using the remote controller, but the remote operation is not effective for all cases. To overcome some complex obstacles such as rocks or stairs, the information related to the robot posture is required. However, the sensor information is not intuitive to the user to control the robot. In this research, a multi-active crawler robot (MACbot) was developed and the autonomous stair climbing algorithm was implemented to deal with those problems. Various experiments show that the MACbot can climb the stair autonomously.

Export Performance and Stock Return: A Case of Fishery Firms Listing in Vietnam Stock Markets

Quy Thi VO 한국유통과학회 2019 The Journal of Asian Finance, Economics and Busine Vol.6 No.4

The research aims to study the relationship between export performance and stock return of Vietnamese fishery companies. To conduct this study, quarterly data was collected for period from 2010-2018 of 13 fishery companies listing in Ho Chi Minh Stock Exchange (HOSE) and Ha Noi Stock Exchange (HNX). The export performance was measured by export intensity, export growth and export market coverage. In addition, interest rate, exchange rate, GDP, firm size, profitability, and financial leverage were considered as the control variables in the research model. Panel data analysis with Generalized Least Squares model was employed to estimate the predictive regression. The findings indicated that export intensity and export growth have a significant and positive relationship with stock returns. However, export market coverage has not a significant relationship with stock return at the 0.05 level. Profitability, financial leverage, and exchange rate have a positive relationship, while interest rate and GDP have no relation to stock return at the 0.05 significance level. The findings imply that investors should consider the export intensity instead of export growth and export market coverage as selecting stock of fishery exports firms to invest; managers should increase export intensity to increase company’s stock price or firm market value.

Improved electrocatalytic activity of electrodeposited Ni₃S₄ counter electrodes for dye- and quantum dot-sensitized solar cells

Quy, Vu Hong Vinh,Park, Jeong-Hyun,Kang, Soon-Hyung,Kim, Hyunsoo,Ahn, Kwang-Soon Elsevier 2019 Journal of industrial and engineering chemistry Vol.70 No.-

<P><B>Abstract</B></P> <P>Nickel sulfide (Ni<SUB>3</SUB>S<SUB>4</SUB>) films are deposited onto F-doped SnO<SUB>2</SUB> (FTO) substrates using a facile one-step potentiodynamic electrodeposition without any extra treatment. The potential sweep is between −0.9V and 0.7V (vs. Ag/AgCl) for 4–10 cycles. The series resistance is gradually reduced with increased Ni<SUB>3</SUB>S<SUB>4</SUB> film thickness, indicating the metallic conduction of the Ni<SUB>3</SUB>S<SUB>4</SUB> phase. The Ni<SUB>3</SUB>S<SUB>4</SUB> deposited for 8 cycles (denoted FTO/Ni<SUB>3</SUB>S<SUB>4</SUB>-8) exhibits full coverage on the FTO substrate, with 110nm thickness and a distinctive structure of porous and nanoscale interconnecting nanoparticular networks, which provide numerous electrochemical active sites to contact with electrolyte. The film not only exhibits prominent electrocatalytic activities but also shows excellent electrochemical stability in both polysulfide and iodide-based electrolytes compared to FTO/Pt. On the contrary, the FTO/Ni<SUB>3</SUB>S<SUB>4</SUB>-10 shows merged clusters, leading to more compact and less porous morphology, which reduced electrocatalytic activity. The quantum dot-sensitized solar cell (QD-SSC) fabricated using the FTO/Ni<SUB>3</SUB>S<SUB>4</SUB>-8 counter electrode (CE) exhibits power conversion efficiency (PCE) of 4.57%, short-circuit current (J<SUB>sc</SUB>) of 15.92mAcm<SUP>−2</SUP>, open-circuit voltage (V<SUB>oc</SUB>) of 0.545V, and fill factor (FF) of 52.63%. In addition, the dye-sensitized solar cell (D-SSC) using FTO/Ni<SUB>3</SUB>S<SUB>4</SUB>-8 CE achieves a PCE of 8.17%, J<SUB>sc</SUB> of 16.28mAcm<SUP>−2</SUP>,V<SUB>oc</SUB> of 0.735V, and FF of 68.34%. On the other hand, the PCEs of 2.56% and 7.58% are obtained for QD-SSC and D-SSC with Pt CE, respectively. We suggest that the electrodeposited Ni<SUB>3</SUB>S<SUB>4</SUB> should be promising electrocatalytic electrodes for various applications such as QD-SSCs, D-SSCs, supercapacitors, photoelectrochemical water-splitting cells, and batteries.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Ni<SUB>3</SUB>S<SUB>4</SUB> films were electrochemically synthesized on F-doped SnO<SUB>2</SUB> substrates. </LI> <LI> FTO/Ni<SUB>3</SUB>S<SUB>4</SUB> exhibited porous and nanoscale interconnecting nanoparticular networks. </LI> <LI> FTO/Ni<SUB>3</SUB>S<SUB>4</SUB> provided excellent electrocatalytic activity and numerous active sites. </LI> <LI> It led to significantly enhanced charge transfer and mass transport kinetics. </LI> <LI> FTO/Ni<SUB>3</SUB>S<SUB>4</SUB> CE showed better performance than Pt CE for both of QD-SSC and D-SSC. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>

Combination of an inverse solution and an ANN for damage identification on high-rise buildings

Quy T. Nguyen,Ramazan Livaoğlu 국제구조공학회 2021 Smart Structures and Systems, An International Jou Vol.28 No.3

Structural health monitoring (SHM) is currently applied to control regularly the health of high-rise buildings which have deteriorated after being subjected to a sudden loading. Damage detection at element levels of a structure consisting of an enormous number of elements becomes the main objective. In this study, the complicated problem is simplified by a two-step solution. Damaged storeys are preliminarily detected before a full damage scenario at an element level is achieved. In Step 1, to overcome the issues related to the huge number of degrees of freedom (DOFs), the full building is simplified to a beam-like system using the Guyan condensation technique. As the natural characteristics of the two lowest modes at the intact and a damaged stage are obtained, the eigenvalue problem based inverse solution is applied to approximately detect damaged storeys. Furthermore, an updating procedure that is proposed in this study effectively enhances the first prediction. In Step 2, an artificial neural network (ANN) model is designed to indicate damaged members on detected storeys using only the first three modal modes. Compared to other approaches applied to detect damages on high-rise buildings, the robustness of the proposed method is that the required number of lowest modal modes is two and three in Step 1 and Step 2 respectively. Furthermore, regardless of the extension of the building in the horizontal direction, only one lateral displacement of each storey is measured to detect damaged storeys in Step 1 and generally detect damaged elements in Step 2. For light and asymmetrical damage scenarios, two more vertical displacements should be considered to obtain accurate element-level detection. However, for all cases, the required number of DOFs is significantly lower than the full system.

Recursive Coarse-to-Fine Localization for Fast Object Detection

Quy Nguyen Trung,Dung Phan,Soo Hyung Kim,In Seop Na,Hyung Jeong Yang 보안공학연구지원센터 2014 International Journal of Control and Automation Vol.7 No.1

A high-performance triode-type carbon nanotube field emitter for mass production

Quy, Nguyen Van,Hoa, Nguyen Duc,An, Myungchan,Cho, Yousuk,Kim, Dojin IOP Pub 2007 Nanotechnology Vol.18 No.34

<P>A triode-type field emission device based on carbon nanotubes (CNTs) synthesized on an anodic aluminum oxide (AAO) template was fabricated. For the improvement of device performance, in addition to the basic advantages of using AAO to obtain uniform CNTs with strong adhesion, several considerations were taken into account, including highly crystalline CNTs synthesized through thermal chemical vapor deposition (CVD) at 1200 °C, lowering the contact resistance with a Ti buffer layer and reducing the pixel size and gate-to-emitter distance. The triode-type field emitter showed a high current density of 20 mA cm<SUP>−2</SUP> and a low turn-on voltage of 16 V. The very high field enhancement factor of 1.6 × 10<SUP>6</SUP> cm<SUP>−1</SUP> confirmed the high efficiency of the triode structure in electron extraction.</P>

험지주행 및 전복시 자세복구가 가능한 멀티-트랙 로봇의 개발

Quy-Hung Vu,김병상(Byeong-Sang Kim),송재복(Jae-Bok Song) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.5

Neural-Network-Based Low-Speed-Damping Controller for Stepper Motor With an FPGA

Quy Ngoc Le,Jae-Wook Jeon IEEE 2010 IEEE transactions on industrial electronics Vol.57 No.9

<P>We present a low-speed-damping controller for a stepper motor using artificial neural networks (ANNs). This controller is designed to remove nonlinear disturbance at low speeds. The proposed controller improves the stepper motor performance at less than the resonance speed of the stepper motor system. Due to its ability to learn, the proposed controller can adapt to different resonant speed ranges without any identification process for system parameters. Conversely, we also introduce the implementation of an ANN-based controller, online backpropagation learning, and a microstep driver on a single field-programmable gate array. An implementation and experimental results are conducted to verify the feasibility and the effectiveness of the proposed controller.</P>