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Infectious keratitis in Vietnam:etiology,organisms,and management at Vietnam National Eye Hospital

International Journal of Ophthalmology(English edition) 2022年第1期15卷 128-134页

作者： Pham ngoc Dong Do Thi Thuy Hang nguyen Thi Nga Duong Mai Thi Lien Angela C.Chen Anthony J.Aldave Vietnam National Eye Hospital Hanoi 10000Vietnam Nam Dinh Eye Hospital Nam Dinh 420000Vietnam Stein Eye Institute UCLA David Geffen School of MedicineLos AngelesCA 90095USA

AIM:To report the etiologies,risk factors,treatments,and outcomes of infectious keratitis(IK)at a major Vietnamese eye ***:This is a retrospective review of all cases of IK at Vietnam National Eye Hospital(VNEH)in Hanoi,*** histories,demographics,clinical features,microbiological results,and treatment outcomes were ***:IK was diagnosed in 1974 eyes of 1952 patients,with ocular trauma being the greatest risk factor for IK(34.2%),frequently resulting from an agriculturerelated injur y(53.3%).The mean duration between symptom onset and presentation to VNEH was 19.3±14.4 d,and 98.7%of patients had been treated with topical antibiotic and/or antifungal agents prior to evaluation at *** on smear results of 1706 samples,the most common organisms identified were bacteria(n=1107,64.9%)and fungi(n=1092,64.0%),with identification of both bacteria and fungi in 614(36.0%)***-five of 374 bacterial cultures(14.7%)and 426 of 838 fungal cultures(50.8%)were positive,with the most commonly cultured pathogens being Pseudomonas aeruginosa,Streptococcus pneumonia,Fusarium spp.,and Aspergillus *** perforation and descemetocele developed in 391(19.8%)and 93(4.7%)eyes,*** treatment was successful in resolving IK in 50.4%eyes,while 337(17.1%)eyes underwent penetrating or anterior lamellar *** was performed in 7.1%of eyes,most commonly in the setting of fungal ***:Ocular trauma is a major risk factor for IK in Vietnam,which is diagnosed in almost 400 patients each year at *** this,and as approximately one quarter of the eyes that develop IK require corneal transplantation or evisceration,greater emphasis should be placed on the development of prevention and treatment programs for IK in Vietnam.

关键词： infectious keratitis bacterial keratitis fungal keratitis microsporidial keratitis Acanthamoeba keratitis herpes simplex virus keratitis Vietnam

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Optimizing Bidders Selection of Multi-Round Procurement Problem in Software Project Management Using Parallel Max-Min Ant System Algorithm

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Computers, Materials & Continua 2021年第1期66卷 993-1010页

作者： Dac-Nhuong Le Gia Nhu nguyen arish Garg Quyet-Thang Huynh Trinh ngoc Bao nguyen ngoc Tuan Institute of Research and Development Duy Tan UniversityDa Nang550000Vietnam Faculty of Information Technology Duy Tan UniversityDa Nang550000Vietnam Faculty of Information Technology Haiphong UniversityHaiphong180000Vietnam Graduate School Duy Tan UniversityDa Nang550000Vietnam School of Mathematics Thapar Institute of Engineering and TechnologyPatiala147004India Hanoi University of Science and Technology Hanoi100000Vietnam Hanoi University Hanoi100000Vietnam Department of ICT Ministry of Education and TrainingHanoi100000Vietnam

This paper presents a Game-theoretic optimization via Parallel Min-Max Ant System(PMMAS)algorithm is used in practice to determine the Nash equilibrium value to resolve the confusion in choosing appropriate bidders of multi-round procurement problem in software project *** this end,we introduce an approach that proposes:(i)A Game-theoretic model of multiround procurement problem(ii)A Nash equilibrium strategy corresponds to multi-round strategy bid(iii)An application of PSO for the determination of global Nash *** balance point in Nash Equilibrium can help to maintain a sustainable structure not only in terms of project management but also in terms of future *** an alternative of procuring entities subjectively,a methodology to support decision making has been studied using Nash equilibrium to create a balance point on benefit in procurement where buyers and suppliers need multiple rounds of *** goal focus on the balance point in Nash Equilibrium to optimizing bidder selection in multi-round procurement which is the most beneficial for both investors and selected *** PMMAS algorithm is implemented based on MPI(message passing interface)to find the approximate optimal solution for the question of how to choose bidders and ensure a path for a win-win relationship of all participants in the procurement *** also evaluate the speedup ratio and parallel efficiency between our algorithm and other proposed *** the experiment results,the high feasibility and effectiveness of the PMMAS algorithm are verified.

关键词： Parallel min-max ant system multi-objective multi-round procurement software project management project conflicts Nash equilibrium game theory MPI

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Empirical Analysis on Impact Factors of Green Marketing on Consumer's Willingness to Buy Hygiene Products in Vietnam

Empirical Analysis on Impact Factors of Green Marketing on C...

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作者： nguyen ngoc MINH AN 北京化工大学

学位级别：硕士

COVID-19大流行给越南整体经济带来许多变化,特别是个人和家庭卫生行业。随之而来的是环保意识的增强和各种规模的绿色营销活动的爆发。然而,目前并没有研究关注绿色营销对消费者购买卫生用品意愿的影响。因此,论文以越南为研究对象,针... 详细信息

COVID-19大流行给越南整体经济带来许多变化,特别是个人和家庭卫生行业。随之而来的是环保意识的增强和各种规模的绿色营销活动的爆发。然而,目前并没有研究关注绿色营销对消费者购买卫生用品意愿的影响。因此,论文以越南为研究对象,针对绿色营销对消费者购买卫生用品意愿的影响因素展开实证分析。论文主要工作:(1)研究以4P理论为基础,通过调查问卷的形式对350名受访者的购买意愿进行调查。(2)构建逻辑回归模型,对影响购买意愿的人口统计因素进行探究。(3)引入SEM模型,探究绿色促销、绿色产品、绿色价格和绿色场所对卫生用品购买意愿的影响。论文主要结论:(1)350份调查问卷中,回收了342份有效问卷,并通过了相关检验测试。(2)受访者中,性别、收入和认知度是影响购买决策的关键因素。(3)除绿色促销外、绿色产品、绿色价格和绿色场所均对卫生用品的购买行为产生显著的正向影响。然而,作用强度间存在显著差异,回归系数分别为0.255、0.106和0.191。基于主要结论,文章从绿色促销、绿色产品、绿色价格和绿色场所方面提出了一些政策建议,以期为增强绿色营销对消费者购买意愿的影响。

关键词：绿色营销卫生用品购买意

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Three-Dimensional Meshfree Analysis of Interlocking Concrete Blocks for Step Seawall Structure

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Computers, Materials & Continua 2021年第1期66卷 165-178页

作者： Hau nguyen-ngoc Hnguyen-Xuan Magd Abdel-Wahab Soete Laboratory Faculty of Engineering and ArchitectureGhent UniversityTechnologiepark Zwijnaarde 903B-9052ZwijnaardeBelgium University of Science and Technology The University of DanangDa Nang CityVietnam CIRTech Institute Ho Chi Minh City University of TechnologyHo Chi Minh CityVietnam Division of Computational Mechanics Ton Duc Thang UniversityHo Chi Minh CityVietnam Faculty of Civil Engineering Ton Duc Thang UniversityHo Chi Minh CityVietnam

This study adapts the flexible characteristic of meshfree method in analyzing three-dimensional(3D)complex geometry structures,which are the interlocking concrete blocks of step *** elastostatic behavior of the block is analysed by solving the Galerkin weak form formulation over local support *** 3D moving least square(MLS)approximation is applied to build the interpolation functions of *** pre-defined number of nodes in an integration domain ranging from 10 to 60 nodes is also investigated for their effect on the studied *** accuracy and efficiency of the studied method on 3D elastostatic responses are validated through the comparison with the solutions of standard finite element method(FEM)using linear shape functions on tetrahedral elements and the well-known commercial software,*** results show that elastostatic responses of studied concrete block obtained by meshfree method converge faster and are more accurate than those of standard *** studied meshfree method is effective in the analysis of static responses of complex geometry *** amount of discretised nodes within the integration domain used in building MLS shape functions should be in the range from 30 to 60 nodes and should not be less than 20 nodes.

关键词： Meshfree method local support domain moving least square shape function 3D elastostatic behavior complex geometry

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软木塞基碳量子点的水热合成及其生物相融荧光成像应用

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新型炭材料 2022年第3期37卷 595-602页

作者： Quang Ngo Khoa Hieu nguyen ngoc Bao Vo Van Quoc Phuoc Vo Thi ngoc Le Xuan Diem Doc Luong Quang Tri nguyen Minh Son Le Vu Truong Son Le Van Thanh Ha Che Thi Cam University of Sciences Hue University77 Nguyen HueHueVietnam Faculty of Environmental and Natural Sciences Duy Tan UniversityDa Nang550000Vietnam Institute for Research and Training in Medicine Biology and PharmacyDuy Tan UniversityDa Nang550000Vietnam University of Agriculture and Forestry Hue University102 Phung HungHueVietnam University of Science and Education The University of Da Nang459 Ton Duc ThangLien ChieuDa NangVietnam

以废弃酒瓶软木塞为原料,采用低成本、简单的水热方法合成碳量子点。通过TEM、FTIR、Raman、UV-Vis、PL光谱对碳量子点的结构和光学性能进行分析表征。结果表明,碳量子点的平均直径为6.2±2.7 nm,PL激发谱和碳量子点表面的官能团有关。... 详细信息

以废弃酒瓶软木塞为原料,采用低成本、简单的水热方法合成碳量子点。通过TEM、FTIR、Raman、UV-Vis、PL光谱对碳量子点的结构和光学性能进行分析表征。结果表明,碳量子点的平均直径为6.2±2.7 nm,PL激发谱和碳量子点表面的官能团有关。用硫酸奎宁作为参考,碳量子点的量子效率为1.54%。将获得的碳量子点应用在骨髓间充质干细胞的细胞生物成像上,发现用碳量子点处理后,骨髓间充质干细胞分别在320~380 nm、450~490 nm和450~490 nm范围显示绿色、黄色和红色荧光,表明了碳量子点在荧光成像领域具有潜在的应用价值。

关键词：碳点水热合成荧光荧光图像废酒瓶塞

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The Impact of Transport Infrastructure on Foreign Direct Investment Inflows:A Comparative Analysis of Landlocked and Coastal Countries in Developing Asia

The Impact of Transport Infrastructure on Foreign Direct Inv...

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作者： nguyen ngoc HA 上海财经大学

学位级别：硕士

In today's globalized economy,foreign direct investment(FDI)has been identified as an important driver of economic growth in developing Asian ***,the inflow of FDI is influenced by various factors,and FDI in each region,each country,and each group of economies may involve different set of determinants depending on the destination's own economic,geographical or political characteristics,as well as the investing motives of the *** study examines the impact of infrastructure on FDI inflows in developing Asian countries,with a particular focus on the differences between landlocked and coastal *** results show that transport infrastructure and gross fixed capital formation(GFCF)as a comprehensive proxy for infrastructure have a positive and significant impact on FDI inflows in landlocked ***,for coastal countries,transport infrastructure has no significant effect on FDI *** findings have important theoretical and managerial implications for policymakers to consider when making decisions about infrastructure development and FDI attraction strategies in developing Asian countries.

关键词： FDI developing countries Asia infrastructure transport landlocked countries determinants

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Surface PEGylation of hollow mesoporous silica nanoparticles via aminated intermediate

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Progress in Natural Science:Materials International 2019年第6期29卷 612-616页

作者： Thi ngoc Tram nguyen Diem-Huong nguyen-Tran Long Giang Bach Tran Hoang Du Truong ngoc Thuy Trang Le Dai Hai nguyen Tra Vinh University Institute of Applied Materials Science Vietnam Academy of Science and Technology Graduate University of Science and Technology Vietnam Academy of Science and Technology nguyen Tat Thanh University 5. Institute of Research and Development Duy Tan University

A hybrid of organic/inorganic system, hollow mesoporous silica nanoparticles functionalized with poly(ethylene glycol), was synthesized in the presence of coupling agent and aminated ends. Doxorubicin(DOX) was used as a model drug to evaluate the effect of PEGylation on the loading capacity and release pattern of the *** with transmission electron microscopy(TEM) and scanning electron microscopy(SEM), X-ray diffraction(XRD), nitrogen adsorption-desorption, thermogravimetric analysis(TGA) and Fourier transformed infrared(FTIR) confirmed the PEG conjugation, as well as the amorphous mesoporous nature of the synthesized particles. Due to the capping effect of PEG molecules over the pores in the silica structure, the synthesized system was able to retain higher amount of cargo and establish a controlled manner when releasing.

关键词： Hollow mesoporous silica nanoparticles mPEG PEGylation Surface modification

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Land subsidence prediction for a new urban mass rapid transit line in Hanoi

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Underground Space 2020年第2期5卷 93-104页

作者： Pham Huy Giao Vu Thi Hue nguyen Dang Han nguyen Thi Hai Anh nguyen ngoc Minh Asian Institute of Technology BangkokThailand Institute of Foundation and Underground FECONHanoiViet Nam Sonhai JSC Viet Nam

The rapidly increasing population,urbanization,and industrialization of Hanoi city in the last few decades have necessitated the urgent development of a new underground public transport infrastructure such as the urban mass rapid transit(UMRT)system that is now under ***,concerns on the possible effects of land subsidence on the to-be-constructed and operated UMRT lines must be *** of the difficulties while assessing land subsidence in Hanoi is the insufficient subsidence monitoring ***,a good geotechnical characterization of the subsoil profile and proper numerical analysis can help predict groundwater pumping-induced subsidence *** UMRT line No.2 that was selected for this study is special as it runs across the old quarter downtown,located at the very heart of Hanoi *** this paper,the Hanoi aquifer system,groundwater extraction,and subsidence monitoring network of Hanoi are reviewed *** data from 30 investigation boreholes were analyzed to characterize the subsoil profile underlying a segment of the UMRT line No.2 that consists of both elevated and underground *** soil layers were identified up to a depth of 50 m,including a compressible soft clay layer 10-15 m thick that is supposed to be most vulnerable to subsidence by groundwater *** on the long-term groundwater monitoring data,one-dimensional finite element method(FEM)consolidation analyses were carried out for three drawdown boundary conditions of 5,10,and 15 m and yielded a total subsidence of 0.15,0.35,and 0.5 m,respectively,after 25 years with 1994 as the reference *** results of this study confirmed that land subsidence in particular should be considered in the construction and maintenance of the UMRT lines in Hanoi,in particular for underground sections that are founded on soft to medium clay layers.

关键词： Hanoi aquifer system Groundwater pumping Land subsidence UMRT line Geotechnical characterization

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Effects of C/N ratio on nitrate removal and floc morphology of autohydrogenotrophic bacteria in a nitrate-containing wastewater treatment process

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Journal of Environmental Sciences 2018年第7期30卷 52-60页

作者： Tran ngoc Phu nguyen Shu-Ju Chao Pei-Chung Chen Chihpin Huang Institute of EnvironmentaZ Engineering National Chiao Tung University Hsinchu 300 Chinese Taipei

The effects of C/N ratio of a nitrate-containing wastewater on nitrate removal performed by autohydrogenotrophic bacteria as well as on the morphological parameters of floc such as floc morphology, floc number distribution, mean particle size（MPS）, aspect ratio and transparency were examined in this study. The results showed that the nitrate reduction rate increased with increasing C/N ratio from 0.5 to 10 and that the nitrogen removal of up to 95% was found at the C/N ratios of higher than 5（between 0.5–10）. Besides, high C/N ratio values reflected a corresponding high nitrite accumulation after 12-hr operation, and a fast decreasing rate of nitrite in the rest of operational time. The final p H values increased with the C/N ratio increasing from 0.5 to 2.5, but decreased with the C/N ratio increasing from2.5 to 10. There were no significant changes in floc morphology with the MPSs ranging from35 to 40 μm. Small and medium-sized flocs were dominant in the sludge suspension, and the number of flocs increased with the increasing C/N ratios. Furthermore, the highest apparent frequency of 10% was observed at aspect ratios of 0.5 and 0.6, while the transparency of flocs changed from 0.1 to 0.7.

关键词： Autohydrogenotrophic bacteria C/N ratio Floc morphology Nitrate reduction Nitrite accumulation Nitrogen removal

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The Continuous Knapsack Problem with Capacities

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Journal of the Operations Research Society of China 2021年第3期9卷 713-721页

作者： Huynh Duc Quoc nguyen Chi Tam Tran Hoai ngoc Nhan Department of Mathematics College of Natural ScienceCan Tho UniversityCan Tho City 900900Vietnam Faculty of Basic Sciences Vinh Long University of Technology EducationVinh Long 940000Vietnam

We address a variant of the continuous knapsack problem,where capacities regarding costs of items are given into *** prove that the problem is NP-complete although the classical continuous knapsack problem is solvable in linear *** the case that there exists exactly one capacity for all items,we solve the corresponding problem in O(n log n)time,where n is the number of items.

关键词： Knapsack problem Complexity Capacity Polynomially solvabl

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