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Dynamic Modeling and Experiment of a Fish Robot with a Flexible Tail Fin

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Journal of Bionic Engineering 2013年第1期10卷 39-45页

作者： phi luan nguyen Van Phu Do Byung Ryong Lee ~ Intelligent Control and Mechatronics Lab School of Mechanical Engineering University of Ulsan Daehak-ro 93 Nam-gu Ulsan 680-749 South Korea School of Mechanical Engineering University of Ulsan Daehak-ro 93 Nam-gu Ulsan 680-749 South Korea

This paper presents the dynamic modeling of a flexible tail for a robotic fish. For this purpose firstly, the flexible tail was simplified as a slewing beam actuated by a driving moment. The governing equation of the flexible tail was derived by using the Euler-Bernoulli theory. In this equation, the resistive forces were estimated as a term analogous to viscous damping. Then, the modal analysis method was applied in order to derive an analytical solution of the governing equation, by which the relationship between the driving moment and the lateral movement of the flexible tail was described. Finally, simulations and experiments were carried out and the results were compared to verify the accuracy of the dynamic model. It was proved that the dynamic model of a fish robot with a flexible tail fin well explains the real behavior of robotic fish in underwater environment.

关键词： robotic fish flexible tail dynamic modeling lateral movement

Thrust and Swimming Speed Analysis of Fish Robot with Non-uniform Flexible Tail

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Journal of Bionic Engineering 2016年第1期13卷 73-83页

作者： phi luan nguyen Byung Ryong Lee Kyoung Kwan Ahn School of Mechanical Engineering University of Ulsan Ulsan Korea

We present a dynamic model of a fish robot with a Non-uniform Flexible Tail （NFT）. We investigate the tendencies of the thrust and swimming speed when the input driving moment changes. Based on the proposed dynamic model of the NFT, we derive the thrust estimation, equation of motion, and performance evaluation of a fish robot with a NFT. By defining the optimal stiffness of the NFT in simulation, a fish robot prototype is then designed and fabricated. A series of experiments are performed to verify the proposed model. Experiment results are in good agreement with simulation data. The results show that the thrust and swimming speed of the fish robot are proportional to the amplitude of the driving moment. There are two resonant fre- quencies （f = 1.4 Hz and 2.2 Hz）, the maximum thrust and swimming speed （about 0.7 BL.s-1） are found to be around f = 1.4 Hz. The above results inidicate the proposed model is suitable for predicting the behavior, thrust and swimming speed of a fish robot with a NFT.

关键词： fish robot flexible tail dynamic modeling swimming speed thrust Froude efficiency

Privacy-preserving explainable AI: a survey

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Science China(Information Sciences) 2025年第1期68卷 23-56页

作者： Thanh Tam nguyen Thanh Trung HUYNH Zhao REN Thanh Toan nguyen phi Le nguyen Hongzhi YIN Quoc Viet Hung nguyen School of Information and Communication Technology Griffith University School of Computer and Communication Sciences Ecole Polytechnique Federale de Lausanne Faculty of Mathematics and Computer Science University of Bremen Faculty of Information Technology HUTECH University Department of Computer Science Hanoi University of Science and Technology School of Electrical Engineering and Computer Science The University of Queensland

As the adoption of explainable AI(XAI) continues to expand, the urgency to address its privacy implications intensifies. Despite a growing corpus of research in AI privacy and explainability, there is little attention on privacy-preserving model explanations. This article presents the first thorough survey about privacy attacks on model explanations and their countermeasures. Our contribution to this field comprises a thorough analysis of research papers with a connected taxonomy that facilitates the categorization of privacy attacks and countermeasures based on the targeted explanations. This work also includes an initial investigation into the causes of privacy leaks. Finally, we discuss unresolved issues and prospective research directions uncovered in our analysis. This survey aims to be a valuable resource for the research community and offers clear insights for those new to this domain. To support ongoing research, we have established an online resource repository, which will be continuously updated with new and relevant findings.

关键词： privacy-preserving explainable AI privacy attacks privacy defences PrivEx PPXAI

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

Fully Completed Spherical Fuzzy Approach-Based Z Numbers(phiModel)for Enhanced Group Expert Consensus

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Computers, Materials & Continua 2024年第7期80卷 1655-1675页

作者： phi-Hung nguyen Research Center of Applied Sciences Faculty of BusinessFPT UniversityHanoi100000Vietnam

This study aims to establish an expert consensus and enhance the efficacy of decision-making processes by integrating Spherical Fuzzy Sets(SFSs)and Z-Numbers(SFZs).A novel group expert consensus technique,the phimodel,is developed to address the inherent limitations of both SFSs and the traditional Delphi technique,particularly in uncertain,complex *** such contexts,the accuracy of expert knowledge and the confidence in their judgments are pivotal *** study provides the fundamental operational principles and aggregation operators associated with SFSs and Z-numbers,encompassing weighted geometric and arithmetic operators alongside fully developed operators tailored for SFZs ***,a case study and comparative analysis are conducted to illustrate the practicality and effectiveness of the proposed operators and *** the phi model with SFZs numbers represents a significant advancement in decision-making frameworks reliant on expert ***,this combination serves as a comprehensive tool for decision-makers,enabling them to achieve heightened levels of consensus while concurrently assessing the reliability of expert *** case study results demonstrate the phi model’s utility in resolving complex decision-making scenarios,showcasing its ability to improve consensus-building processes and enhance decision ***,the comparative analysis highlights the superiority of the integrated approach over traditional methodologies,underscoring its potential to revolutionize decision-making practices in uncertain environments.

关键词： Spherical fuzzy sets Delphi method Z-numbers expert consensus phi model uncertainty

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

Schistosomal appendicitis:A serious and often misdiagnosed condition

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World Journal of Clinical Cases 2025年第10期13卷 62-64页

作者： phi Duong nguyen Thanh Kien Lam Orthopaedic-Burn-Plastic Surgery City Children’s HospitalHo Chi Minh City 71815Viet Nam The Faculty of Medical Technology Van Lang UniversityHo Chi Minh City 700000Viet Nam

Schistosomal appendicitis(SA)is a rare but serious complication of schistosomiasis,a parasitic disease affecting over 250 million people worldwide.A recent retrospective study by Wang et al provides important insights into the clinicopathological characteristics of *** study compared 136 cases of SA to 5418 cases of non-SA over a ten-year *** findings include a higher average age of SA patients(61.73 years vs 35.8 years for non-SA),a higher proportion of acute on chronic appendicitis(33.1%vs 16%),and a significantly higher incidence of colorectal cancer(11.7%vs 2.2%).Despite these differences,SA remains a diagnostic challenge due to its nonspecific clinical presentation and lack of specific laboratory *** study also highlights the persistent prevalence of SA,accounting for 1.6%-3.4%of all appendicitis cases each year from 2013 to *** findings underscore the need for enhanced awareness,early detection,and prompt treatment of SA in endemic *** the association with colorectal cancer,patients with SA require thorough screening and *** research into the pathogenesis and diagnostic markers of SA is *** the global battle against schistosomiasis continues,targeted efforts to diagnose and manage SA can significantly improve patient outcomes.

关键词： Schistosomal appendicitis Schistosomiasis Colorectal cancer Misdiagnosis Clinicopathological characteristics