Logistics Revolution for e-commerce in Vietnam: A Brief Review

Hoang Phuong Nguyen,Minh Tuan Nguyen,Minh Tuan Pham 국제이네비해양경제학회 2019 International Journal of e-Navigation and Maritime Vol.13 No.1

For the whole process of circulation, distribution, application of the logistics system is a higher development step of transportation technology. Multimodal transport has linked all modes of transport together to serve the supply and consumption needs of the manufacturer. Currently, when e-commerce (EC) is on the rise, quality logistics and delivery services are the essential stages to achieve success in transactions. e-commerce today is no longer a fashion trend; it is an essential part of the retail industry. EC is changing the game of Logistics. The e-commerce world has been introducing many risks and complex issues that logistics and supply chain experts have never faced. E-commerce is the main impact on terminal logistics (last mile) and warehousing. However, it is also quite interesting to see how e-commerce is impacting airports and seaports. E-commerce is growing actively in Vietnam at a rate of about 25% per year, which is an excellent opportunity for business logistics services to get more orders. Moreover, the Vietnamese logistics market is small but has a high growth rate (20% - 25% / year). In recent times, this market is expected to change the face and grow faster due to the development of electronic retail in Vietnam and e-Logistics logistics trends in the world. However, to meet the requirements, to grasp the opportunities, logistics enterprises need to link to get a closed and synchronized service chain. So logistics companies need to increase information, respond faster, enhance technology to meet flexible processes, establish networks, and business links to meet changing needs. The article shows that the inadequacies and lack of cohesion between logistics service providers and e-commerce are limiting competitiveness, losing opportunities of enterprises, and the economy in the context of healthy industrial revolution 4.0. The assessment of the correlation and connectivity of logistics and e-commerce enterprises in Vietnam in the paper will contribute significantly to the development of Vietnam's economy in the period 2020-2025.

A New Bearing-Only Navigation Law

Minh Hoang Trinh,Viet Hoang Pham,Phuong Huu Hoang,Jin-Hee Son,Hyo-Sung Ahn 제어로봇시스템학회 2017 제어로봇시스템학회 국제학술대회 논문집 Vol.2017 No.10

This paper proposes a new bearing-only control law which can be used for autonomous navigation task. We firstly compare the proposed control law with a commonly used control law in the literature when the agent navigates with only one beacon. Second, we prove that if there are two or more beacons, the agent can almost globally asymptotically reaches the desired position under the proposed control law. Third, the proposed control law is then applied to a cooperative bearing-only navigation problem. Simulation result is given to support the mathematical analysis.

Line Impedance Estimation Based Adaptive Droop Control Method for Parallel Inverters

Phuong Minh Le,Xuan Hoa Thi Pham,Huy Minh Nguyen,Duc Duy Vo Hoang,Tuyen Dinh Nguyen,Dieu Ngoc Vo 전력전자학회 2018 JOURNAL OF POWER ELECTRONICS Vol.18 No.1

This paper presents a new load sharing control for use between paralleled three-phase inverters in an islanded microgrid based on the online line impedance estimation by the use of a Kalman filter. In this study, the mismatch of power sharing when the line impedance changes due to temperature, frequency, significant differences in line parameters and the requirements of the Plug-and-Play mode for inverters connected to a microgrid has been solved. In addition, this paper also presents a new droop control method working with the line impedance that is different from the traditional droop algorithm when the line impedance is assumed to be pure resistance or pure inductance. In this paper, the line impedance estimation for parallel inverters uses the minimum square method combined with a Kalman filter. In addition, the secondary control loops are designed to restore the voltage amplitude and frequency of a microgrid by using a combined nominal value SOGI-PLL with a generalized integral block and phase lock loop to monitor the exact voltage magnitude and frequency phase at the PCC. A control model has been simulated in Matlab/Simulink with three voltage source inverters connected in parallel for different ratios of power sharing. The simulation results demonstrate the accuracy of the proposed control method.

Determinants Influencing Information Transparency in Vietnamese Commercial Banks

NGUYEN, Minh Phuong,NGUYEN, Thi Hong Hai,HOANG, Phuong Dung,TRAN, Manh Dung,PHAM, Quang Trung Korea Distribution Science Association 2020 The Journal of Asian Finance, Economics and Busine Vol.7 No.12

Information transparency ensures that market players all have the opportunity to access the same information to come up with their assessment of the banks' financial situation, performance and risks to reach effective investment decisions. This research is conducted to investigate the levels of impact of determinants on information transparency by examining the case studies of Vietnamese commercial banks. This study combines both qualitative and quantitative research methods, based on interviews of 32 specialists in banking, accounting and auditing fields, which were conducted to explore determinants influencing information transparency and to develop measurement scales. Then, a survey of 160 managers of commercial banks, audit firms, and accounting managers of firms who frequently had transactions with banks was carried out to investigate the statistical significance of these determinants. The results show that, out of seven determinants that have significant impacts on the banks' information transparency, commitment from banks' senior management regarding transparency in information disclosure has the highest impact, followed by state governance, auditing, information infrastructure, credit rating agencies, personnel and bank performance. Accordingly, we provide some recommendations for improving information transparency in the Vietnamese banking industry context as a case study and in emerging countries context in general.

Measurement technology using Z axis adaptation for burrs formed on curved surfaces

Huu Phuong Hoang,Hoang Minh To,고성림 대한기계학회 2015 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.29 No.8

Burr is an undesirable jutting out formed as a result of plastic deformation of a metal during cutting and shearing operations. Burrneeds to be minimized by an effective deburring process to improve the efficiency of machining and the quality of product. There is alsoa growing need for a measurement method or suitable measurement device to inspect burrs, favorably at drilled holes, sizes ranging frommicro to macro. In fact, without an appropriate measurement method, it has become more difficult to examine and measure burrs formedon a free surface. In this work, a burr measurement system is developed using a conoscopic holography sensor, which offers certain advantagesover interferometry, triangulation, and dynamic focusing, for point-by-point distance mapping. The measurement system isfurther improved to measure burrs on curved and inclined exit surfaces, whose range exceeds the measurement range of sensors, by usinga Z axis adaptation method.

Line Impedance Estimation Based Adaptive Droop Control Method for Parallel Inverters

Le, Phuong Minh,Pham, Xuan Hoa Thi,Nguyen, Huy Minh,Hoang, Duc Duy Vo,Nguyen, Tuyen Dinh,Vo, Dieu Ngoc The Korean Institute of Power Electronics 2018 JOURNAL OF POWER ELECTRONICS Vol.18 No.1

This paper presents a new load sharing control for use between paralleled three-phase inverters in an islanded microgrid based on the online line impedance estimation by the use of a Kalman filter. In this study, the mismatch of power sharing when the line impedance changes due to temperature, frequency, significant differences in line parameters and the requirements of the Plug-and-Play mode for inverters connected to a microgrid has been solved. In addition, this paper also presents a new droop control method working with the line impedance that is different from the traditional droop algorithm when the line impedance is assumed to be pure resistance or pure inductance. In this paper, the line impedance estimation for parallel inverters uses the minimum square method combined with a Kalman filter. In addition, the secondary control loops are designed to restore the voltage amplitude and frequency of a microgrid by using a combined nominal value SOGI-PLL with a generalized integral block and phase lock loop to monitor the exact voltage magnitude and frequency phase at the PCC. A control model has been simulated in Matlab/Simulink with three voltage source inverters connected in parallel for different ratios of power sharing. The simulation results demonstrate the accuracy of the proposed control method.

Development of Online 3D Wrinkle Measurement System

호앙후평(Huu Phuong Hoang),토호앙밍(Hoang Minh To),고성림(Sung Lim Ko) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.11

Roll to roll (R2R) system, known as 'web processing', is the process of producing these electronic devices on a roll of flexible plastic. With the need of improved performance and productivity in R2R industry, effective control and on-line supervision for web quality is essential. In this report, we present a system for on-line measurement of wrinkles, one of defects incurring due to compressive stresses developed in the web. This system is able to capture an image generated when a well defined line shape laser beam passes through a transparent web. The system calculates 3D shape information, including the height of the wrinkle on the web, and displays the images for the shape information of the web in real time. By using area scan camera and machine vision laser, this system takes more advantages of setting up as a simple and low cost system compared to the line scan camera systems that widely used in web manufacturing. Specific calibration method and analysis on the achievable accuracy will be discussed.

The Effectiveness of Financial Sources for Climate Change in Vietnam

Thi Nhung NGUYEN(Thi Nhung NGUYEN ),Minh Hoa NGUYEN(Minh Hoa NGUYEN ),Thi Phuong Anh VU(Thi Phuong Anh VU ),Thi Hoang Anh DO(Thi Hoang Anh DO ) 한국유통과학회 2023 The Journal of Asian Finance, Economics and Busine Vol.10 No.1

This research aims to give information about the current situation of five financial sources for climate change in Vietnam, including (i) the State budget used by ministries; (ii) the State budget used by provinces; (iii) Bilateral funds; (iv) Multilateral funds; and (v) Private funds, and then classify them in line with the effectiveness. The working paper’s secondary data on spending on CC-related activities, collected from reports of six ministries and 29 provinces, show that the State budget has been crucial in subsidizing CC-related activities in Vietnam. Moreover, domestic investment has accounted for a major part of the total expenditure of ministries and provinces for climate change. In addition, by using primary data collected from surveys sent to twelve experts from 5 groups, such as researchers, practical experts, managers of private funding organizations (such as banks and enterprises), managers of international funding organizations and beneficiaries, and then analyzing the data through the AHP method, the study shows that all climate finance sources in Vietnam are still not very effective. However, private sector funds are considered the most effective financial source for responding to climate change.

An effective combination of reusable Pd@MOF catalyst and deep eutectic solvents for high-performance C–C coupling reaction

Minh-Huy Dinh Dang,Trang Thi Thu Nguyen,Bao Quang Gia Le,Linh Ho Thuy Nguyen,Ngoc Xuan Dat Mai,My Van Nguyen,Phuong Hoang Tran,Tan Le Hoang Doan 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.111 No.-

Pd-incorporated Zr-based metal–organic framework containing sulfone groups, named Pd(II)BUT-11, wassuccessfully prepared by dispersing the sulfone-functionalized MOF in Pd(OAc)2 solution. X-ray diffraction,scanning electron microscopy, N2 isotherm sorption, X-ray photoelectron spectroscopy, and thermogravimetricanalysis were applied to determine the features of the Pd-incorporated MOF. In the catalyticstudies, Pd(II)@BUT-11 was shown to be an efficient heterogeneous catalyst for synthesizing various stilbenederivatives via the cross-coupling Heck reaction with DABCO-derived deep eutectic solvent (DES) asa green solvent. Notably, the catalyst and the solvent could be recovered and reused, with their activityand structure remaining stable throughout several trials. The method provides an alternative solution tothe conventional catalysts and solvents, resulting in a green and efficient stilbene synthesis process. Furthermore, the stilbenes were separated by extraction with ethyl acetate due to the low solubility ofDES with this solvent.

Using sulfate-functionalized Hf-based metal–organic frameworks as a heterogeneous catalyst for solvent-free synthesis of pyrimido[1,2-a] benzimidazoles via one-pot three-component reaction

Minh-Huy Dinh Dang,Linh Ho Thuy Nguyen,Trang Thi Thu Nguyen,Ngoc Xuan Dat Mai,Phuong Hoang Tran,Tan Le Hoang Doan 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.103 No.-

Functionalized metal–organic frameworks have recently received significant attention in heterogeneouscatalysis applications due to their high catalytic activity. In this work, a sulfate-functionalized Hf-clusterbasedmetal–organic framework was prepared via sulfation of a Hf-MOF, named Hf-BTC, constructed byHf6 clusters and 1,3,5-tricarboxylate linkers. The Hf-BTC-SO4 material was consequently demonstrated tobe an efficiently reusable superacid catalyst for a one-pot three-component reaction of pyrimido[1,2-a]benzimidazoles synthesis. The reaction catalyzed by the sulfated Hf-BTC could be carried out under mildand solvent-free conditions and give superior performance in a wide range of substrates. According todetailed investigation, the good catalytic performance of the sulfated-functionalized MOF likely originatesfrom the high-porosity framework and the high active sites of the functionalized clusters. Importantly, the catalyst could be easy to recover and reuse the functionalized framework several timeswith minor changes in catalytic efficiency.