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Abstract

The implementation of public-private partnerships has become one of the effective models of cooperation between the public and private sectors in the development of infrastructure in Vietnam. This model has been adopted in Vietnam for many years and is intended to help governments build infrastructure and provide an opportunity to reduce government debt profiles. This study aims to identify the most critical factors that could determine the success of these projects. A questionnaire was conducted based on the participants’ experience in the implementation of public-private partnerships projects and a total of 216 respondents were received. A regression analysis shows that six critical success factors, including factors relevant to public sector, factors relevant to private sector, factors relevant to selected process partnerships, factors relevant to risk management systems, factors relevant to project information, and factors relevant to natural environment. The findings indicated that the most effective development projects could be carried out via PPPs if the government could focus on these important factors in the implementation process. The results will influence political development towards PPP and guide partners in developing public-private partnerships projects.
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Authors and Affiliations

Nguyen Quoc Toan
1
ORCID: ORCID
Dinh Tuan Hai
2
ORCID: ORCID

  1. Hanoi University of Civil Engineering, Faculty of Construction Economics and Management, No. 55 Giai Phong Street, Hai Ba Trung District, Hanoi, Vietnam
  2. Hanoi Architectural University, Faculty of Civil Engineering, Km 10, Nguyen Trai Street, Thanh Xuan District, Hanoi City, Vietnam
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Abstract

This paper proposes an advanced Internet of Things (IoT) system for measuring, monitoring, and recording some power quality (PQ) parameters. The proposed system is designed and developed for both hardware and software. For the hardware unit, three PZEM-004T modules with non-invasive current transformer (CT) sensors are used to measure the PQ parameters and an Arduino WeMos D1 R1 ESP8266 microcontroller is used to receive data from the sensors and send this data to the server via the internet. For the software unit, an algorithm using Matlab software is developed to send measurement data to the ThingSpeak cloud. The proposed system can monitor and analyse the PQ parameters including frequency, root mean square (RMS) voltage, RMS current, active power, and the power factor of a low-voltage load in real-time. These PQ parameters can be stored on the ThingSpeak cloud during the monitoring period; hence the standard deviation in statistics of the voltage and frequency is applied to analyse and evaluate PQ at the monitoring point. The experimental tests are carried out on low-voltage networks 380/220 V. The obtained results show that the proposed system can be usefully applied for monitoring and analysing chosen PQ parameters in micro-grid solutions.
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Bibliography

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Authors and Affiliations

Ngo Minh Khoa
1
ORCID: ORCID
Le Van Dai
2
Doan Duc Tung
1
ORCID: ORCID
Nguyen An Toan
1
ORCID: ORCID

  1. Faculty of Engineering and Technology, Quy Nhon University, Vietnam
  2. Faculty of Electrical Engineering Technology, Industrial University of Ho Chi Minh City, Vietnam
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Abstract

For voltage-source-converter based high-voltage-direct-current (VSC-HVDC) transmission systems, fault ride-through (FRT) capability is a very important grid requirement in order to enhance its operational availability under an alternating current (AC) grid fault condition. Voltage sags during a short-circuit fault in power transmission lines can lead to fluctuations in the direct current (DC) link voltage of converter systems, and may induce reversed power flow and even trip a VSC-HVDC transmission system. A practical method is developed in this paper for investigating FRT capability of VSC-HVDC transmission system characteristics during a voltage sag event using experimental results from Smart Grid Laboratory. Symmetrical and asymmetrical voltage sag events with different remaining voltages are applied to an AC grid that lasts with a variable duration. The experimental waveforms of the two converter systems are recorded and analyzed in order to evaluate the FRT capability of VSC-HVDC transmission systems.
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Authors and Affiliations

Ngo Minh Khoa
1
ORCID: ORCID
Nguyen An Toan
1
ORCID: ORCID
Doan Duc Tung
1
ORCID: ORCID

  1. Faculty of Engineering and Technology, Quynhon University, Vietnam
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Abstract

The transport system is considered the “backbone” of the urban development. Along with the rapid economic development, the urban road transport system is being paid attention and invested by Hanoi city. By the year 2050, The Hanoi municipal government is expected to complete and hand over for use about 317 urban road transport projects. Due to the high demands of social and economic efficiency, the urban road transport projects in Hanoi face many risks. In which, there are 13 high dangerous risks for the urban road transport project in Hanoi. These risks have the high probability and severity impacted on the outcome of the projects. The project participant’s risk management standpoint will determine the solutions to respond the respective risks, thereby affecting the results of the project. In this paper, the authors compare the risk management standpoint of three main project participants, including owner/project management board, consultant and main contractor/subcontractor. The difference of the risk management standpoint is shown clearly by the project participants’ assessments of 13 high dangerous risks.
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Authors and Affiliations

Nguyen Quoc Toan
1
ORCID: ORCID
Nguyen Thi Thuy
1
ORCID: ORCID
Dinh Tuan Hai
2
ORCID: ORCID
Pham Xuan Anh
1
ORCID: ORCID

  1. Hanoi University of Civil Engineering, Faculty of Construction Economics and Management, No. 55 Giai Phong Street, Hai Ba Trung, Hanoi, Vietnam
  2. Hanoi Architectural University, Faculty of Civil Engineering, Km 10, Nguyen Trai Street, Thanh Xuan District, Hanoi City, Vietnam
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Abstract

The world has been implementing Building Information Modelling (BIM) successfully to construction projects from small to large scale. In Vietnam and many other countries, BIM is also widely applied in different fields of the construction industry. However, there are still many problems that need to be solved. One of those is to determine the necessary BIM competencies, thereby develop BIM personnel recruitment standards. The article identifies the competencies as well as evaluates their importance when supporting the recruitment of BIM personnel in construction enterprises in Vietnam. Through survey forms such as survey on online recruitment, expert interviews, and survey forms, the study is conducted with Likert scale, relative importance index (RII) for result analysis and ranking the importance of BIM competency for three distinct group of positions in Vietnam. With this result, the authors hope that the study will be an important reference, contributing to the development and concretization of the required competency criteria in the recruitment of BIM personnel in Vietnam and other similar countries.
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Authors and Affiliations

Pham Xuan Anh
1
ORCID: ORCID
Nguyen Quoc Toan
1
ORCID: ORCID
Tran Phuong Nam
1
ORCID: ORCID
Hoang Duy Long
1
ORCID: ORCID
Do Duc Thang
1
ORCID: ORCID

  1. Hanoi University of Civil Engineering, Faculty of Construction Economics and Management, No. 55 Giai Phong Street, Hai Ba Trung District, Hanoi, Vietnam
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Abstract

Materials play an important role in determining the quality and cost of a building, especially in the context of Vietnam’s rapid urbanization today. This study aims to analyze the status quo for supplier selection for construction projects in a developing country, Vietnam. Questionnaires are designed to conduct a survey among several contractors to assess the current situation of how Vietnamese construction enterprises select their material suppliers. Senior managers, project managers, site commanders, site engineers, foreman, office staff of contractors were interviewed. Based on result analysis of 117 valid responses, the most important criteria to consider when selecting material suppliers have been identified, with the most influential ones being price, delivery time, and material quality. However, the supply of materials still reveals some constraints that must be overcome. Vietnamese construction firms should pay more attention to supplier selection to optimize material delivery efficiency. This research contributes to the understanding of the status quo for supplier selection for construction projects in a developing country. This means contractors can adopt suitable measures to select material suppliers for construction projects.
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Authors and Affiliations

Nguyen Quoc Toan
1
ORCID: ORCID
Hanh Nguyen Thi My
1
ORCID: ORCID
Nguyen Van Tam
1
ORCID: ORCID
Pham Xuan Anh
1
ORCID: ORCID
Dinh Tuan Hai
2
ORCID: ORCID
Nguyen Thi Thuy
1
ORCID: ORCID

  1. Hanoi University of Civil Engineering, Faculty of Construction Economics and Management, No. 55 Giai Phong Street, Hai Ba Trung District, Hanoi, Vietnam
  2. Hanoi Architectural University, Faculty of Civil Engineering, Km 10, Nguyen Trai Street, Thanh Xuan District, Hanoi City, Vietnam

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