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Automotive Service Quality Investigation Using a Grey-DEMATEL Model

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Computers, Materials & Continua 2022年第12期73卷 4779-4800页

作者： phi-hung nguyen Faculty of Business FPT UniversityHanoi100000Vietnam

In today’s fast-challenging business environment,automobile manufacturers are required to supply customers with high-quality vehicles at competitive ***,existing research on factors influencing service quality lacks a detailed and systematic understanding,and there is no consensus study on causal relationship and measuring the weights of service quality factors in the automotive manufacturing *** study provides an integrated technique for evaluating the automotive service quality in the context of VinFast-the Vietnamese leading ***,the Grey Theory System(GTS)is utilized to estimate the subjective views of the decision maker(DM)and overcome incomplete and vague decision ***,a Decision-Making Trial and Evaluation Laboratory approach integrated with GTS(Grey-DEMATEL)is proposed not only to define the cause-effect factors but also to quantify the causal relationship of proposed criteria,which is based on comprehensive analyses of the current service quality literature and experts’opinions,as well as to capture the criteria *** results show that the weights of main criteria can be sorted as follow:Tangibility>Reliability>Assurance>Pricing>Empathy>*** the proposed sub-criteria,Pricing is the top concern compared to other dimensions,making it a prerequisite for *** causal relationships of VinFast’s service quality are discovered by the Grey-DEMATEL *** findings also indicated a rising need for VinFast to focus on ***,the proposed model might be used as a decision support tool to contribute to the literature on service quality,provide recommendations for future study,and assist managers in improving service qualitymore efficiently.

关键词： MCDM grey theory DEMATEL SERVQUAL automobile industry

A Hybrid Grey DEMATEL and PLS-SEM Model to Investigate COVID-19 Vaccination Intention

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Computers, Materials & Continua 2022年第9期72卷 5059-5078页

作者： phi-hung nguyen Department of Business Management National Taipei University of TechnologyTaipei10608Taiwan Faculty of Business FPT UniversityHanoi100000Vietnam

The main objective of this study is to comprehensively investigate individuals’vaccination intention against COVID-19 during the second wave of COVID-19 spread in Vietnam using a novel hybrid ***,the Decision-Making Trial and Evaluation Laboratory based on Grey Theory(DEMATEL-G)was employed to explore the critical factors of vaccination intention among ***,Partial Least Squares-Structural Equation Modeling(PLS-SEM)was applied to test the hypotheses of individual behavioral intention to get the vaccine to prevent the outbreak of COVID-19.A panel of 661 valid respondents was collected from June 2021 to July 2021,and confidentiality was maintained for all data *** results identified that perception of COVID-19 vaccination and trust in vaccination strategy directly associated with individuals’COVID-19 ***,the perceived severity of COVID-19 has an indirect impact on COVID-19 vaccination intentions via the perception of the COVID-19 *** findings indicated that the government’s information about vaccines is necessary for the new phase of vaccination intervention strategies in ***,the study suggests that the government needs to give complete information about the role of vaccines prioritizes transparency in official information about COVID-19 vaccines to allay concerns about side effects,allowing for the most appropriate policy formulation and implementation to encourage public *** studies can apply PLS-SEM and other MCDM models with the fuzzy,hesitant numbers to re-evaluate the feasibility,validity and reliability of this research’s proposed model.

关键词： COVID-19 vaccination immunization intervention PLS-SEM DEMATEL grey theory vietnam

Agricultural Supply Chain Risks Evaluation with Spherical Fuzzy Analytic Hierarchy Process

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Computers, Materials & Continua 2022年第11期73卷 4211-4229页

作者： phi-hung nguyen Faculty of Business FPT UniversityHanoi100000Vietnam

The outbreak of the COVID-19 pandemic has impacted the development of the global *** most developing and third world countries are heavily dependent on agriculture and agricultural imports,the agricultural supply chains(ASC)in all these countries are exposed to unprecedented risks following ***,it is vital to investigate the impact of risks and create resilient ASC *** this study,critical risks associated with ASC were assessed using a novel Analytical Hierarchy Process based on spherical fuzzy sets(SF-AHP).The findings indicated that depending on the scope and scale of the organization,supply risks,demand risks,financial risks,logistics and infrastructure risks,management and operational risks,policy and regulatory risks,and biological and environmental risks all have a significant impact on *** research highlighted that the most significant criterion is specified as Transportation(TP),followed by Market(MA)and Policy(PO),***,Technology(TL)is the least significant *** study’s findings can help managers with a holistic view of the agriculture supply chain risk ***,this study may assist managers in sharing information about the processing of agricultural products from top to bottom to manage risk in the supply chain.

关键词： MCDM supply chain risks spherical fuzzy AHP Vietnam

Two-Stage PLS-SEM and Fuzzy AHP Approach to Investigate Vietnamese SMEs’Export Competitiveness

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Computers, Materials & Continua 2022年第8期72卷 4107-4123页

作者： phi-hung nguyen Department of Business Management National Taipei University of TechnologyTaipei10608Taiwan Faculty of Business FPT UniversityHanoi100000Vietnam

Vietnam is paying great to the seafood exporting sector,offering various significant production advantages,concluding that it is critical to understand the competitiveness of the target market and implement effective ***,due to COVID 19,the value of Vietnamese pangasius exports resulted in low and unpredictable profits for pangasius *** is obvious to recognize competitiveness as Multi-Criteria Decision Making(MCDM)problem in the uncertain business ***,this study is the first to propose a two-staged Partial Least Squares-Structural Equation Modeling(PLS-SEM)and Fuzzy Analytic Hierarchy Process(FAHP)analysis to identify potential criteria and comprehensively investigate the competitiveness of Vietnamese pangasius export Small and Medium-sized Enterprises(SMEs)in the context of China ***,a dataset of 186 valid respondents from seafood export SMEs was collected through an online survey from June to December *** PLS-SEM approach was applied to ascertain the positive impact of the proposed criteria contributing to the competitiveness of Vietnamese pangasius against China *** PLS-SEM results showed that all criteria strongly correlated with the pangasius exporting ***,the FAHP method is employed to rank the subjective weights of mentioned criteria based on 12 experts’*** infrastructure(C3)has the highest rank of competitiveness criteria with the highest weight,followed by Product(C4).In contrast,Prices(C6)was indicated as the lowest rank at 0.107 regarding FAHP ***,this study provides insights into stakeholders seeking to improve competitiveness performance.

关键词： PLS-SEM FAHP competitiveness pangasius SMEs MCDM

A Grey Simulation-Based Fuzzy Hierarchical Approach for Diagnosing Healthcare Service Quality

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Computers, Materials & Continua 2023年第2期74卷 3231-3248页

作者： phi-hung nguyen Hong-Anh Pham Faculty of Business FPT UniversityHanoi100000Vietnam

This study aims to assess and rank the service quality of the healthcare system utilizing a Fuzzy Analytical Hierarchical Process(Fuzzy AHP)andGreyRelationalAnalysis(Fuzzy GRA)*** this study,the six primary characteristics of healthcare service quality,comprising Tangibles(A),Healthcare Staff(B),Responsiveness(C),Relationships(D),Support Service(E),and Accessibility(F),are examined through a case study of 20 private and public hospitals in Hanoi,*** weighting results of Fuzzy AHP technique indicated that Responsiveness(C)has the highest ranking,followed by Relationships(D)and Healthcare Staff(B).Meanwhile,Tangibility has finally comprised the next priority for increasing satisfaction with the service quality in the healthcare ***,the highest service quality rankings are top 5 private hospitals via the Fuzzy GRA ***,this proposed approach may be applied to a complex decision-making process,which often makes sense with subjective data or imprecise information.

关键词： MCDM fuzzy sets AHP GRA healthcare Vietnam

Spherical Fuzzy WASPAS-based Entropy Objective Weighting for International Payment Method Selection

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Computers, Materials & Continua 2022年第7期72卷 2055-2075页

作者： phi-hung nguyen Thanh-Tuan Dang Kim-Anh nguyen Hong-Anh Pham Faculty of Business FPT UniversityHanoi100000Vietnam Department of Business Management National Taipei University of TechnologyTaipei1068Taiwan Department of Industrial Engineering and Management National Kaohsiung University of Science and TechnologyKaohsiung80778Taiwan

In international trade,exporters prefer to receive payments as quickly as possible,and importers want to make payments as late as *** this respect,the payment field,an essential condition for trade transactions,also represents the positions of exporters and importers *** addition,there are many cases in which various variables must be considered rather than only one specific variable representatively affecting payment,particularly in the case of import-export Small and Medium-Sized Enterprises(SMEs)from emerging countries.A selection of proper payment methods can be categorized as a Multi-Criteria Decision-Making(MCDM)***,this study aims to propose a novel and efficient Spherical Fuzzy Weighted Aggregated Sum Product Assessment based Entropy Objective Weighting method(SF-EW and WASPAS-SF)to evaluate international payment methods with uncertain ***,SF-EW model is applied to determine the relative weights of critical ***,international payment method alternatives are prioritized by the WASPAS-SF *** essential factors for four international payment methods are proposed based on experts’opinions and the existing literature.A real-world case study from Vietnamese import-export SMEs is presented to validate the applicability of the proposed *** results indicated that“Characteristics of payment method(PA)”had the most significant impact on international payment method *** comparison,“Letters of Credit(L/C)”was the most reliable payment method with the highest ranking available to international ***,a sensitivity analysis was performed to examine the validity and robustness of the proposed decision support ***,this study could contribute to international payment services and in the context of globalization and international trade.

关键词： International payment Vietnam MCDM spherical fuzzy theory entropy WASPAS

Study of relationship between motion of mechanisms in gas operated weapon and its shock absorber

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Defence Technology（防务技术） 2024年第3期33卷 42-54页

作者： Jiri Balla Roman Vitek Dung nguyen Van Zbynek Krist hung nguyen Van Department of Weapons and Ammunition University of Defence BrnoCzech Republic Department of Weapons Le Quy Don Technical UniversityHanoiViet Nam Department of Design and Special Engineering Alexander Dubcek University of TrencinSlovakia

The article deals with the motion of the breech block carrier and the weapon casing of an automatic weapon mounted on a flexible carriage and the base of the *** works,which did not consider the dynamic properties of the base of the weapon,did not allow to reconcile the calculated and experimental results of the weapon casing displacement when shooting from firing *** the analysis of the motion of individual parts,the methods of mathematical modelling and firing experiments using a high-speed camera were *** show the best accord with experiment when modelling the system with 4 degrees of *** oscillation of the system regarding the movement of the breech block carrier and the weapon casing was investigated under changed conditions of rate of fire,the use of a muzzle brake and different types of shock *** velocities and displacements of the weapon casing and the breech block carrier at different values of the impulse of the gases to the breech block carrier were determined.

关键词： Shock absorber Gas-operated weapon Force-impulse diagram Recoil system Breech block carrier

Forecasting measured responses of structures using temporal deep learning and dual attention

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Frontiers of Structural and Civil Engineering 2024年第6期18卷 832-850页

作者： Viet-hung DANG Trong-Phu nguyen Thi-Lien PHAM Huan X.nguyen Department of Structural Mechanics Hanoi University of Civil EngineeringHanoi 11600Vietnam Faculty of Applied Science University of Economics-Technology for IndustriesHanoi 11600Vietnam London Digital Twin Research Centre Faculty of Science and TechnologyMiddlesex UniversityLondon NW44BTUK International School Vietnam National UniversityHanoi 11600Vietnam

The objective of this study is to develop a novel and efficient model for forecasting the nonlinear behavior of structures in response to time-varying random *** key idea is to design a deep learning architecture to leverage the relationships,between external excitations and structure's vibration signals,and between historical values and future values,within multiple time-series *** proposed method consists of two main steps:the first step applies a global attention mechanism to combine multiple-measured time series and time-varying excitation into a weighted time series before feeding it to a temporal architecture;the second step utilizes a self-attention mechanism followed by a fully connected layer to predict multi-step future *** viability of the proposed method is demonstrated via two case studies involving synthetic data from a three-dimensional(3D)reinforced concrete structure and experimental data from an 18-story steel ***,comparison and robustness studies are carried out,showing that the proposed method outperforms conventional methods and maintains high performance in the presence of noise with an amplitude of less than 10%.

关键词： structural dynamic time-varying excitation deep learning signal processing response forecasting

Heterogeneous decentralised machine unlearning with seed model distillation

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CAAI Transactions on Intelligence Technology 2024年第3期9卷 608-619页

作者： Guanhua Ye Tong Chen Quoc Viet hung nguyen Hongzhi Yin School of Information Technology and Electrical Engineering The University of QueenslandSt LuciaQueenslandAustralia School of Information and Communication Technology Griffith UniversityBrisbaneQueenslandAustralia

As some recent information security legislation endowed users with unconditional rights to be forgotten by any trained machine learning model,personalised IoT service pro-viders have to put unlearning functionality into their *** most straight-forward method to unlearn users'contribution is to retrain the model from the initial state,which is not realistic in high throughput applications with frequent unlearning *** some machine unlearning frameworks have been proposed to speed up the retraining process,they fail to match decentralised learning scenarios.A decentralised unlearning framework called heterogeneous decentralised unlearning framework with seed(HDUS)is designed,which uses distilled seed models to construct erasable en-sembles for all ***,the framework is compatible with heterogeneous on-device models,representing stronger scalability in real-world *** experiments on three real-world datasets show that our HDUS achieves state-of-the-art performance.

关键词： data mining data privacy machine learning