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International Journal of Disaster Risk Science 2018年第1期9卷 16-27页

作者： Li-San hung Department of Geography Pennsylvania State University

This exploratory study targets married, heterosexual couples living in Sarasota County, Florida and uses a dyadic interview approach to understand how the interactions of married couples, or intra-household dynamics,could affect household hurricane preparedness. Interview results reveal that couples consider household hurricane preparedness to be a joint process between husband and wife, but in many cases, partners do not have the same opinions about these preparations. This study also shows the relations between household hurricane preparedness and household division of labor, and how the tendency of wives to prioritize relational preparedness activities could be an answer to understanding why some quantitative studies show that females have lower preparedness levels than males. Other potential problems with this previous research, including the selection of survey participants and the measurement of household hurricane preparedness, are likewise discussed.

关键词： Dyadic interviews Gender Household decision making Household hurricane preparedness Intra-household dynamics

Landslide Susceptibility Mapping by Using Landslide RatioBased Logistic Regression:A Case Study in the Southern Taiwan

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Journal of Mountain Science 2015年第3期12卷 721-736页

作者： WU Chun-hung Department of Water Resources Engineering and Conservation Feng Chia University

The object of the research is to compare the model performance and explain the error source of original logistic regression landslide susceptibility model(abbreviated as or-LRLSM) and landslide ratio-based logistic regression landslide susceptibility model(abbreviated as lr-LRLSM) in the Chishan watershed with a serious landslide disaster after 2009 Typhoon Morakot. The landslide inventory induced by 2009 Typhoon Morakot in South Taiwan is the main research material, while the Chishan watershed is the research area. Six variables, including elevation, slope, aspect, geological formation, accumulated rainfall, and bank erosion, were included in the two models. The performance of lr-LRLSM is better than that of or-LRLSM. The Cox & Snell R2, Nagelkerke R2 value, and the area under the relative operating characteristic curve(abbreviated as AUC) of lrLRLSM is larger than those of or-LRLSM, and the average correct ratio for the lr-LRLSM to predict landslide or non-landslide is larger than that of orLRLSM by 5.0%. The increase of the average correct ratio(abbreviated as ACR) difference from or-LRLSM to lr-LRLSM shows in slope, revised accumulated rainfall, aspect, geological formation and bank erosion variables, and only light decreases in elevation variable. The error sources of continuous variables in building the or-LRLSM is the dissimilarity between the distribution of landslide ratio and production of coefficient and characteristic values, while those of categorical variables is due to low correlation of landslide ratio and the coefficient value of each parameter. Using the classification of landslide ratio as the database to build logistic regression landslide susceptibility model(abbreviated as LRLSM) can revise the errors. The comparison of or-LRLSM and lr-LRLSM in the Chishan watershed also shows that building the landslide susceptibility model(abbreviated as LSM) by using lr-LRLSM is practical and of better performance than that by using the or-LRLSM.

关键词： Logistic regression Landslidesusceptibility Landslide ratio Chishan watershed Typhoon Morakot

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

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

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 NOTE ON SINGULAR INTEGRALS WITH DOMINATING MIXED SMOOTHNESS IN TRIEBEL-LIZORKIN SPACES

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Acta Mathematica Scientia 2014年第4期34卷 1331-1344页

作者： hung Viet LE Faculty of Science and Technology Hoa Sen UniversityQuang Trung Software ParkSection 10Ward Tan Chanh HiepDistrict 12Ho Chi Minh CityViet Nam

Let h, be a measurable function defined on R^＋ ×R^＋. Let Ω ∈ L（log L^＋）^υq （S^n1-1 × S^n2-1）（1≤ υq ≤ 2） be homogeneous of degree zero and satisfy certain cancellation conditions. We show that the singular integral Tf（x1,x2）=p.v.∫∫R^n1＋n2 Ω（y′1,y′2）h（｜y1｜,｜y2｜）/｜y1｜^n1｜y2｜^n2 f（x1-y1,x2-y2）dy1dy2maps from Sp,q^α1,α2F（R^n1×R^n2）boundedly to itself for 1 〈 p, q 〈 ∞, α1, α2 ∈R.

关键词： singular integrals Marcinkiewicz integrals mixed smoothness Triebel-Lizorkin spaces

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

Effect of Carboxymethyl Cellulose(CMC) Functionalization on Dispersion, Mechanical, and Corrosion Properties of CNT/Epoxy Nanocomposites

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Chinese Journal of Polymer Science 2023年第8期41卷 1277-1286,I0010页

作者： Da-Wei Zhang Leonard chia Ying Huang Department of Civil Construction and Environmental EngineeringNorth Dakota State UniversityFargo 58108USA

Carbon nanotube(CNT)/epoxy nanocomposites have a great potential of possessing many advanced ***,the homogenization of CNT dispersion is still a great challenge in the research field of *** study applied a novel dispersion agent,carboxymethyl cellulose(CMC),to functionalize CNTs and improve CNT dispersion in *** effectiveness of the CMC functionalization was compared with mechanical mixing and a commonly used surfactant,sodium dodecylbenzene sulfonate(Na DDBS),regarding dispersion,mechanical and corrosion properties of CNT/epoxy nanocomposites with three different CNT concentrations(0.1%,0.3%and 0.5%).The experimental results of Raman spectroscopy,particle size analysis and transmission electron microscopy showed that CMC functionalized CNTs reduced CNT cluster sizes more efficiently than Na DDBS functionalized and mechanically mixed CNTs,indicating a better CNT *** peak particle size of CMC functionalized CNTs reduced as much as 54%(0.1%CNT concentration)and 16%(0.3%CNT concentration),compared to mechanical mixed and Na DDBS functionalized *** of the better dispersion,it was found by compressive tests that CNT/epoxy nanocomposites with CMC functionalization resulted in 189%and 66%higher compressive strength,224%and 50%higher modulus of elasticity than those with mechanical mixing and Na DDBS functionalization respectively(0.1%CNT cencentration).In addition,electrochemical corrosion tests also showed that CNT/epoxy nanocomposites with CMC functionalization achieved lowest corrosion rate(0.214 mpy),the highest corrosion resistance(201.031Ω·cm^(2)),and the lowest porosity density(0.011%).

关键词： CNT/epoxy composites Carboxymethyl cellulose Dispersion Mechanical properties Corrosion properties

Porous Cube-like In_2O_3 Nanoparticles and Their Sensing Characteristics toward Ethanol

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Journal of Materials Science & Technology 2008年第4期24卷 667-674页

作者： Chih-chia HUANG Chen-Sheng YEH Natl Cheng Kung Univ Dept Chem Tainan 70101 Taiwan

Porous cube-like crystalline In2O3 nanoparticles with an average diagonal length of 34.8 nm were fabricated by a laser ablation-reflux process to form In（OH）3, followed by a calcination treatment to yield porous In2O3. HRTEM （high-resolution transmission electronic microscopy）, XRD （X-ray diffraction）, BET （Brunauer-Emmett-Teller）, and XPS （X-ray photoelectron spectroscopy） analysis were used to characterize their crystalline structures, grain sizes, surface areas, and surface compositions. The as-prepared porous in-dium oxides were tested for their sensing properties toward ethanol. Non-porous In2O3 nanopowder （about 40 nm） was also examined in order to compare the results with the as-prepared porous In2O3 nanomaterials. The porous In2O3 exhibited much better performance than that of non-porosus In2O3, and showed enhanced sensitivity with a lower detection limit than other reported In2O3-based materials when exposed to ethanol. Good gas sensitivity and linear behavior as a function of ethanol concentration were observed in the porous In2O3 nanoparticles.

关键词： In2O3 Porosity Nanoparticles Gas sensor