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Scale and scope economies in small household rice farming in vietnam

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Journal of Integrative Agriculture 2021年第12期20卷 3339-3351页

作者： viet-Ngu HOANG Trung Thanh nguyen Clevo WILSON Thong Quoc HO Uttam KHANAL School of Economics and Finance Queensland University of TechnologyBrisbaneQLD 4000Australia Institute for Environmental Economics and World Trade Leibniz University HannoverHannover 30167Germany University of Economics Ho Chi Minh City Ho Chi Minh City 72516Vietnam Agriculture Victoria Department of JobsPrecincts and RegionsHorshamVIC 3400Australia

The vietnamese agricultural sector has experienced a dramatic structural change based on increased specialization in rice ***,small-scale rice-farmers have continued to grow multiple crops,especially in less developed *** the literature advocates crop diversification for reasons of both economic and ecological sustainability,there lacks empirical evidence as to whether crop diversification brings efficiency and productivity gains to small *** present study is the first applications of the input-oriented stochastic distance function approach in estimating scale and scope economies using data of multi-crop farming households in *** find strong evidence of product-specific economies of *** economies are also present for rice,vegetable,and other annual crop *** suggests that crop diversification enhances efficiency and ***,there still exists significant technical inefficiency in crop production,indicating opportunities to expand farm output at the existing level of inputs and *** specifically,our empirical results indicate that it is desirable to expand vegetable and other annual crop production in mountainous areas while rice cultivation can be further expanded in delta and coastal regions.

关键词： input distance function stochastic frontier economies of scope economies of scale product-specific

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Sustainable Supplier Selection Model in Supply Chains During the COVID-19 Pandemic

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Computers, Materials & Continua 2022年第2期70卷 3005-3019页

作者： Chia-Nan Wang Chao-Fen Pan viet Tinh nguyen Syed Tam Husain Department of Industrial Engineering and Management National Kaohsiung University of Science and TechnologyKaohsiung80778Taiwan Faculty of Commerce Van Lang UniversityHo Chi Minh City70000Vietnam

As global supply chains become more developed and complicated,supplier quality has become increasingly influential on the competitiveness of businesses during the Covid-19 ***,supplier selection is an increasingly important process for any business around the *** a supplier is a complex decision that can result in lower procurement costs and increased profits without increasing the cost or lowering the quality of the ***,these decision-making problems can be complicated in caseswithmultiple potential ***’s textile and garment industry,for example,has made rapid progress in recent years but is still facing great difficulties as the supply of raw materials and machinery depends heavily on foreign ***,it is extremely important for textile and garment manufacturing companies in vietnam to implement an effective supplier evaluation and selection *** multicriteria decision-making models are frequently employed to assist with supplier evaluation and selection problems,few of these models consider the problem under the condition of a fuzzy decision-making *** aim of this paper is to create a hybrid MCDM model using the Fuzzy Analytical Hierarchy Process(FAHP)model and the Technique for Order of Preference by Similarity to Ideal Solution(TOPSIS)to assist the supplier selection process in the garment industry in a fuzzy decision-making *** this study,the FAHP method is used to evaluate the performance and the weight of each *** is then used to rank all potential *** proposed model is then applied to a real-world case study to demonstrate both the process of calculation as well as its real-world *** results from the case study provide empirical evidence that the model is *** proposed approach can also be used in combination with other MCDM models to better support decision makers and can be modified to be applied in similar suppl

关键词： MCDM model FAHP fuzzy theory TOPSIS garment industry covid-19

A Model for Selecting a Biomass Furnace Supplier Based on Qualitative and Quantitative Factors

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Computers, Materials & Continua 2021年第11期69卷 2339-2353页

作者： Chia-Nan Wang Hsin-Pin Fu Hsien-Pin Hsu Van Thanh nguyen viet Tinh nguyen Ansari Saleh Ahmar Department of Industrial Engineering and Management National Kaohsiung University of Science and TechnologyKaohsiung80778Taiwan Department of Marketing and Distribution Management National Kaohsiung University of Science and TechnologyKaohsiung80778Taiwan Department of Supply Chain Management National Kaohsiung University of Science and TechnologyKaohsiung80778Taiwan Faculty of Commerce Van Lang UniversityHo Chi Minh City70000Vietnam Faculty Department of Statistics Faculty of Mathematics and Natural SciencesUniversitas Negeri MakassarMakassar90223Indonesia

In developing countries,solar energy is the largest source of energy,accounting for 35%–45%of the total energy *** energy resource plays a vital role in meeting the energy needs of the world,especially in *** has favorable natural conditions for this energy *** it is hot and humid,and it has much rainfall and fertile soil,biomass develops very ***,byproducts from agriculture and forestry are abundant and continuously ***,byproducts that are considered natural waste have become the cause of environmental pollution;these include burning forests,straw,and sawdust in the North;and rice husks dumped into rivers and canals in the Mekong Delta *** energy is provided in a short cycle,is environmentally safe to use and is encouraged by organizations that support sustainable *** advantage of this energy source provides energy for economic development and ensures environmental *** to the abovementioned favorable conditions,many biomass energy plants are being built in *** other renewable energy investment projects,the selection of the construction contractor,the selection of equipment for the installation of the power plant,and the choice of construction site are complex multi-criteria *** this case,decisionmakers must evaluate many qualitative and quantitative *** factors interact with each other and it is difficult to use personal experience to choose the optimal solution for such complex decision-making problems,especially in a fuzzy decision-making ***,in this study,the authors use a Multi-Criteria Decision-Making(MCDM)model that uses a Fuzzy Analytic Hierarchy Process(FAHP)model and the Combined Compromise Solution(CoCoSo)algorithm to select biomass furnace suppliers utilizing both qualitative and quantitative ***,the results of this work will provide the first look at a hybrid CoCoSo/FAHP method that decision-m

关键词： Biomass energy supplier selection biomass furnace MCDM optimization CoCoSo algorithm fuzzy theory FAHP model industry 4.0

Numerical investigation of the effect of seasonal variations of depthof-closure on shoreline evolution

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International Journal of Sediment Research 2021年第1期36卷 1-16页

作者： Xuan Tinh nguyen Minh Thanh Tran Hitoshi Tanaka Trung viet nguyen Yuta Mitobe Cong Dien Duong Department of Civil Engineering Tohoku University

The current study presents the effects of seasonal variations in the depth-of-closure（D;） on shoreline evolution using a numerical,one-line shoreline *** erosion of the southern beach of the Nha Trang Coast,which is located in south central of vietnam,is selected as the study *** study area is immensely influenced by the tropical monsoon climate that has a clear pattern of large waves in the northeast monsoon season and calm waves in the non-monsoon *** analysis of the long-term measured shoreline variations from a video-camera system has found a strong correlation of these variations to the monsoon-dominated wave characteristics in the Nha Trang ***,a new approach for determining the depth-of-closure with consideration of the seasonal wave climate changes is purposed in the current *** implementing this new approach into a numerical,one-line shoreline model,it is found that the seasonal variations of D;appear to better describe the periodical shoreline evolution due to the monsoon-dominated wave characteristics for the Nha Trang *** important findings are considered to commonly apply for monsoon-dominated coastal regions in *** findings are useful information not only for scientific readers but also for the coastal authorities and managers in order to make better countermeasure plans against this kind of erosion mechanism in the future.

关键词： Video camera Shoreline change One-line theory Nha Trang Beach Depth-of-closure Monsoon wave climate

Aerodynamic force generation of an insect-inspired flapper actuated by a compressed unimorph actuator

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Chinese Science Bulletin 2009年第16期54卷 2871-2879页

作者： nguyen Quoc-viet PARK Hoon C GOO Nam S BYUN Doyoung Department of Advanced Technology Fusion Konkuk University National Research Laboratory for Biomimetics and Intelligent Microsystems Konkuk University Department of Aerospace Engineering Konkuk University

We examined experimentally the flapping performance in terms of aerodynamic force generation of an insect-inspired flapper actuated by both of original LIPCA and compressed LIPCA. Flapping tests for two artificial wing shapes of horse botfly and hawk moth were conducted at the wing rotation angle of 60° and a flapping frequency range from 6 Hz to 12 Hz to find the optimum flapping frequency and to investigate the effect of compressed LIPCA and wing shape on the force generation. Flapping tests in the vacuum were also undertaken to measure the induced inertia force. The aerodynamic force was calculated by subtracting the inertia force from the total force measured in the air. It was found that the average inertia force was relatively small when compared with the average total force. The use of the compressed LIPCA could significantly improve the flapping angle of the flapper from 110° to 130° (18.2% increase) resulting in 24.5% increase in the average aerodynamic force. It was also found that flapper with hawk moth wings could produce larger force than the flapper with horse botfly wings.

关键词：空气动力驱动器插板压缩部队昆虫压电片单层

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STRONG CONVERGENCE OF AN INERTIAL EXTRAGRADIENT METHOD WITH AN ADAPTIVE NONDECREASING STEP SIZE FOR SOLVING VARIATIONAL INEQUALITIES

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Acta Mathematica Scientia 2022年第2期42卷 795-812页

作者： nguyen Xuan LINH Duong viet THONG Prasit CHOLAMJIAK Pham Anh TUAN Luong Van LONG Department of Mathematics Mathematics Falcuty of Information TechnologyNational University of Civil Engineering Division of Applied Mathematics Thu Dau Mot UniversityBinh Duong ProvinceVietnam School of Science University of PhayaoPhayao 56000Thailand Paculty of Mathematical Economics National Economics UniversityHanoi CityVietnam

In this work,we investigate a classical pseudomonotone and Lipschitz continuous variational inequality in the setting of Hilbert space,and present a projection-type approximation method for solving this *** method requires only to compute one projection onto the feasible set per iteration and without any linesearch procedure or additional projections as well as does not need to the prior knowledge of the Lipschitz constant and the sequentially weakly continuity of the variational inequality mapping.A strong convergence is established for the proposed method to a solution of a variational inequality problem under certain mild ***,we give some numerical experiments illustrating the performance of the proposed method for variational inequality problems.

关键词： Inertial method Tseng’s extragradient viscosity method variational inequality problem pseudomonotone mapping strong convergence

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Combining SnO_(2-x)and g-C_(3)N_(4)nanosheets toward S-scheme heterojunction for high selectivity into green products of NO degradation reaction under visible light

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Journal of Materiomics 2022年第1期8卷 1-8页

作者： Pham Van viet Thanh-Dat nguyen Dai-Phat Bui Cao Minh Thi Faculty of Materials Science and Technology University of ScienceVNU-HCM227 Nguyen Van Cu StreetDistrict 5Ho Chi Minh City700000Viet Nam vietnam National University-Ho Chi Minh City Thu Duc DistrictHo Chi Minh City700000Viet Nam Ho Chi Minh City University of Technology(HUTECH) 475A Dien Bien Phu StreetBinh Thanh DistrictHo Chi Minh City700000Viet Nam

NOx emissions cause many negative impacts on the living *** photocatalysis of semiconductors is superior for nitric oxide(NO)degradation due to their low redox *** this report,we combine SnO_(2-x)/g-C_(3)N_(4)heterojunction photocatalyst toward the high selectivity into green products under visible light *** show that SnO_(2-x)/g-C_(3)N_(4)heterojunction degraded 40.8%of NO,which is 1.6 times higher than that of g-C_(3)N_(4).In addition,the selectivity coefficient of SnO_(2-x)/g-C_(3)N_(4)is higher 3 times than both pure SnO_(2-x)and g-C_(3)N_(4).Furthermore,SnO_(2-x)/g-C_(3)N_(4)expresses a superior stability for NO photocatalytic-degradation after five *** scavenger trapping test results,and electron spin resonance(ESR)analysis also provide more understanding of the charge transfer mechanism of ***_(2-x)/g-C_(3)N_(4)heterojunction shows a high removal efficiency of NO gas,making it an up-and-coming environmental treatment candidate.

关键词： G-C_(3)N_(4) NO removal Oxygen vacancies Photocatalysis S-scheme

New urban map of Eurasia using MODIS and multi-source geospatial data

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Geo-Spatial Information Science 2017年第1期20卷 29-38页

作者： Bayan Alsaaideh Ryutaro Tateishi Dong Xuan phong nguyen Thanh Hoan Ahmad Al-Hanbali Bai Xiulian Center for Environmental Remote Sensing(CEReS) Chiba UniversityChibaJapan COPRONA Inc.International Consulting Company Vung TauVietnam Institute of Geography Vietnamese Academy of Science and Technology(VAST)HanoiVietnam Geosphere environmental technology corp. tokyoJapan

Urban areas are of paramount significance to both the individuals and communities at local and regional ***,the rapid growth of urban areas exerts effects on climate,biodiversity,hydrology,and natural ecosystems ***,regular and up-to-date information related to urban extent is necessary to monitor the impacts of urban areas at local,regional,and potentially global *** study presents a new urban map of Eurasia at 500 m resolution using multi-source geospatial data,including Moderate Resolution Imaging Spectroradiometer(MODIS)data of 2013,population density of 2012,the Defense Meteorological Satellite Program’s Operational Linescan System(DMSP-OLS)nighttime lights of 2012,and constructed Impervious Surface Area(ISA)data of *** Eurasian urban map was created using the threshold method for these data,combined with references of fine resolution Landsat and Google Earth *** resultant map was compared with nine global urban maps and was validated using random sampling *** of the accuracy assessment showed high overall accuracy of the new urban map of 94%.This urban map is one product of the 20 land cover classes of the next version of Global Land Cover by National Mapping Organizations.

关键词： Urban area mapping population density MODIS data integration accuracy assessment eurasia

Towards understanding structure–property relations in materials with interpretable deep learning

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npj Computational Materials 2023年第1期9卷 157-168页

作者： Tien-Sinh Vu Minh-Quyet Ha Duong-nguyen nguyen viet-Cuong nguyen Yukihiro Abe Truyen Tran Huan Tran Hiori Kino Takashi Miyake Koji Tsuda Hieu-Chi Dam Japan Advanced Institute of Science and Technology NomiIshikawaJapan HPC SYSTEMS Inc. MinatoTokyoJapan Applied Artificial Intelligence Institute Deakin UniversityGeelongVICAustralia School of Materials Science and Engineering Georgia Institute of TechnologyAtlantaGAUSA Research and Services Division of Materials Data and Integrated System National Institute for Materials ScienceTsukubaIbarakiJapan Research Center for Computational Design of Advanced Functional Materials National Institute of Advanced Industrial Science and TechnologyTsukubaIbarakiJapan Department of Computational Biology and Medical Sciences Graduate School of Frontier SciencesUniversity of TokyoKashiwa-shiChiba-kenJapan International Center for Synchrotron Radiation Innovation Smart(SRIS) Tohoku UniversityAoba-kuSendaiJapan

Deep learning(DL)models currently employed in materials research exhibit certain limitations in delivering meaningful information for interpreting predictions and comprehending the relationships between structure and material *** address these limitations,we propose an interpretable DL architecture that incorporates the attention mechanism to predict material properties and gain insights into their structure–property *** proposed architecture is evaluated using two well-known datasets(the QM9 and the Materials Project datasets),and three in-house-developed computational materials ***–test–split validations confirm that the models derived using the proposed DL architecture exhibit strong predictive capabilities,which are comparable to those of current state-of-the-art ***,comparative validations,based on first-principles calculations,indicate that the degree of attention of the atoms’local structures to the representation of the material structure is critical when interpreting structure–property relationships with respect to physical *** properties encompass molecular orbital energies and the formation energies of *** proposed architecture shows great potential in accelerating material design by predicting material properties and explicitly identifying crucial features within the corresponding structures.

关键词： properties property structure