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Deep learning long short-term memory combined with discrete element method for porosity prediction in gravel-bed rivers

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International Journal of Sediment Research 2023年第1期38卷 128-140页

作者： Duong Tran Anh Ahad Hasan Tanim Daniel Prakash Kushwaha Quoc Bao Pham Van Hieu bui HUTECH University Center for River Harbor and Landslide Research Chittagong University of Engineering & Technology Govind Ballabh Pant University of Agriculture and Technology Institute of Applied Technology Thu Dau Mot University Faculty of Mechanical Engineering Thuyloi University

The porosity of gravel riverbed material often is an essential parameter to estimate the sediment transport rate, groundwater-river flow interaction, river ecosystem, and fluvial geomorphology. Current methods of porosity estimation are time-consuming in simulation. To evaluate the relation between porosity and grain size distribution(GSD), this study proposed a hybrid model of deep learning Long Short-Term Memory(LSTM) combined with the Discrete Element Method(DEM). The DEM is applied to model the packing pattern of gravel-bed structure and fine sediment infiltration processes in threedimensional(3D) space. The combined approaches for porosity calculation enable the porosity to be determined through real time images, fast labeling to be applied, and validation to be done. DEM outputs based on the porosity dataset were utilized to develop the deep learning LSTM model for predicting bed porosity based on the GSD. The simulation results validated with the experimental data then segregated into 800 cross sections along the vertical direction of gravel pack. Two DEM packing cases, i.e., clogging and penetration are tested to predict the porosity. The LSTM model performance measures for porosity estimation along the z-direction are the coefficient of determination(R~2), root mean squared error(RMSE), and mean absolute error(MAE) with values of 0.99, 0.01, and 0.01 respectively, which is better than the values obtained for the Clogging case which are 0.71, 0.14, and 0.03, respectively. The use of the LSTM in combination with the DEM model yields satisfactory results in a less complex gravel pack DEM setup, suggesting that it could be a viable alternative to minimize the simulation time and provide a robust tool for gravel riverbed porosity prediction. The simulated results showed that the hybrid model of the LSTM combined with the DEM is reliable and accurate in porosity prediction in gravel-bed river test samples.

关键词： Numerical modeling Discrete element method LSTM Bed porosity Gravel-bed river

Treatment 2.0 Pilot in Vietnam—Early Progress and Challenges

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World Journal of AIDS 2012年第2期2卷 64-70页

作者： Duc Duong bui Fabio Mesquita Thi Nhan Do Masaya Kato Thi thuy Van Nguyen Thi Minh thu Nguyen Adrienne Poon Ministry of Health Vietnam Vietnam Authority for HIV/AIDS Control Ha Noi Vietnam World Health Organization Ha Noi Vietnam World Health Organization Ha Noi Vietnam.

Announced in 2010 at the International AIDS Conference in Vienna and pioneered by the Joint United Nations Programme on HIV/AIDS (UNAIDS) and the World Health Organization's (WHO) leadership at the global level, Treatment 2.0 is a new approach to the HIV response that encourages innovation, efficiency, and sustainability. building upon WHO and UNAIDS' '3 by 5' Initiative, Treatment 2.0 focuses upon scale-up and universal access of life-saving ART treatment through strategic investments and innovations in five priority pillars that include: 1) Optimize drug regimens, 2) Provide point-of-care (POC) and other simplified diagnostic and monitoring tools, 3) Reduce costs, 4) Adapt service delivery, and 5) Mobilize communities [1-3]. The Treatment 2.0 approach is in line with UNAIDS' 2011-2015 Strategy: Getting to Zero with the vision of, 'Zero New infections;Zero discrimination;and Zero AIDS-related deaths', and as well as the four strategic directions for the health sector response outlined under WHO's Global Health Sector Strategy on HIV/AIDS 2011-2015 [4,5]. At the Sixty-fourth World Health Assembly (WHA) in May 2011, it was formally announced that Vietnam has taken the leadership to pilot Treatment 2.0 in two of its provinces, with support from both the WHO and UNAIDS country offices [6,7]. Given that Vietnam is one of the few countries with a concentrated epidemic to pilot Treatment 2.0, the outcomes and experiences of this initiative can provide valuable insight to other countries who may consider implementation. The objectives of this article are therefore to: 1) Describe the early process for translating Treatment 2.0 concept in Vietnam's context;and 2) Highlight early progress and challenges.

关键词： Treatment 2.0 Vietnam Innovation in Response

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越南语媒体关于孔子学院新闻报道的话语分析

越南语媒体关于孔子学院新闻报道的话语分析

作者：裴氏秋顺（bui Thi thu Thao）华南理工大学

学位级别：硕士

随着中国在世界上地位不断提升,各国家(地区)学习汉语慢慢变成热潮。从2004年来,为了推动汉语加快走向世界,提升中国语言文化影响力,发展中国与其他国家的友好关系,中国开始成立孔子学院。2014年越南正式设立孔子学院,至今也是唯一一所... 详细信息

随着中国在世界上地位不断提升,各国家(地区)学习汉语慢慢变成热潮。从2004年来,为了推动汉语加快走向世界,提升中国语言文化影响力,发展中国与其他国家的友好关系,中国开始成立孔子学院。2014年越南正式设立孔子学院,至今也是唯一一所孔子学院,从2008年越南政府公布设立孔子学院的公告开始,但直到6年后才揭牌。该段时间越南语媒体的对越南设立孔子学院公告一事高度关注,纷纷议论越南该不该设立孔子学院,这一事件非常值得深思。越南语媒体对孔子学院用什么方式来报道?报道特点是什么?而越南语媒体针对越南孔子学院的关注和报道则反映该现状的背后的一些深意,值得本文去研究。本文选取越南语媒体作为研究对象。首先使用量化内容分析法对越南语媒体关于孔子学院的报道篇幅、报道幅度、报道主题、报道版面、新闻曝光度、报道关联度等方面进行分析。然后使用Fairclough的话语分析理论与框架,从文本,话语实线和社会实线(社会情景)三个维度对越南语媒体关于孔子学院报道的文本、风格、修辞进行详细深入的探讨。本研究进一步对越南设立孔子学院通告事件的始末、承办方话语、中国政府形象话语、新闻舆论话语进行分析。研究发现,越南语媒体对孔子学院报道方式有以下几点:第一,在报道标题方面,越南语媒采用修辞的手法刻画出针对孔子学院的争议;第二,在分类孔子学院的词汇方面,越南语媒体运用情态词语、人称代词、构词法把孔子学院和反对孔子学院的那一方进行了明确的划分,而反对孔子学院的那一方是正义,公正的。第三,在语篇句法方面,越南语媒体采用重复方式来强调孔子学院的政治性,用被动句传递主客体关系。越南语媒体运用这手法与方式足够在读者心中刻画一个充满危机的孔子学院。本文找出越南语媒体关于孔子学院报道的主要特点:关注度不够、主要关注孔子学院争议、过度联想、放大对孔子学院的不满。本文进一步探讨其背后的原因:媒体体制不同、中越关系的变动。从此,本研究为越南孔子学院自身的发展提出相关的建议:适当控制孔子学院数量、提高办学质量、吸引越南语媒体对越南孔子学院实际活动报道、推广孔子学院良好形象。

关键词：孔子学院新闻报道 Fairclough话语分析越南语媒体

越南学生汉字在线学习的问题和策略——以初级汉语水平的学生为例

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越南学生汉字在线学习的问题和策略——以初级汉语水平的学生为例

作者：裴氏秋霞（bui Thi thu Ha）西南大学

学位级别：硕士

随着“汉语热”在全球的火爆,越来越多的人想学习汉语,了解中国经济、社会、文化等各种领域,越南学生也不例外。而在学习汉语过程中,把握好汉字是不可缺少的步骤,因为汉字学习就是汉语学习的重点。但是因为疫情的爆发,不想间断学习活动... 详细信息

随着“汉语热”在全球的火爆,越来越多的人想学习汉语,了解中国经济、社会、文化等各种领域,越南学生也不例外。而在学习汉语过程中,把握好汉字是不可缺少的步骤,因为汉字学习就是汉语学习的重点。但是因为疫情的爆发,不想间断学习活动的话,教师与学生必须要选择在线教学与学习方式。也就是说,在疫情时间,越南学生也必须要通过各种在线学习方式来学习汉字。在这个过程中,他们要面对不少问题,而这些问题却直接影响到学生的学习汉字兴趣和汉语水平能力。本研究以初级汉语水平越南学生为调查对象,采用问卷调查的方式深入地了解越南学生对汉字在线学习的情况与态度,从而发现和分析初级汉语水平越南学生汉字在线学习过程中常遇到的问题,并给他们提出一些解决问题策略。本文分为五个部分,第一部分是绪论,包括选题缘由、文献综述、研究目的与意义、研究内容与方法。第二部分是关于汉字在线学习的界定,包括“汉字在线学习”的含义、汉字在线学习的优势、线上与线下汉字学习的区别以及学生汉字在线学习的条件。第三部分是初级汉语水平的越南学生汉字在线学习的问卷调查设计。第四部分是初级汉语水平越南学生汉字在线学习的调查结果。第五部分是初级汉语水平越南学生在线学习汉字常见问题的分析。最后部分是初级汉语水平越南学生汉字在线学习的策略。本文的研究目的是调查、分析以及总结初级汉语水平越南学生汉字在线学习的情况、存在的问题和在学习过程中遇到的问题,最终能给初级汉语水平越南学生提供一些学习方法,笔者希望越南教师能通过本文了解初级汉语水平越南学生汉字在线学习存在的问题,从而找到行之有效的在线教学策略。

关键词：初级汉语水平越南学生,汉字在线学习

High-dose methylprednisolone pulse therapy for the treatment of patients with severe COVID-19: Results from a prospective observational study

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Journal of Intensive Medicine 2022年第3期2卷 197-198页

作者： Thinh N.bui Hoang-Anh Ngo Nhat M.Huynh Nguyen-Huy Do-Tran Lac Duy Le thu-Anh Nguyen COVID-19 Intensive Care Unit 2 Thu Duc City HospitalThu Duc CityHo Chi Minh CityTam Phu 721400Vietnam Woolcock Institute of Medical Research 298 Kim MaBa DinhHanoi 118000Vietnam Usher Institute Old Medical SchoolUniversity of EdinburghEdinburgh EH89AGUnited Kingdom School of Medicine Vietnam National UniversityDong HoaHo Chi Minh CityDi AnBinh Duong 590000Vietnam Sydney School of Medicine The Faculty of Medicine and HealthThe University of SydneyCamperdownNSW 2050Australia

To the Editor:Recent randomized controlled trials,as well as high-quality systematic reviews and meta-analyses,strongly support the use of corticosteroids in patients with coronavirus disease 2019(COVID-19)who require oxygen support.[1]The use of pulse cor-ticosteroid therapy has been reported in case series and studies,showing significant improvement in patients and a reduction in mortality rate.[2]In this letter,we report the mortality rate among patients with severe COVID-19 receiving pulse corticos-teroids with methylprednisolone(500 mg/day)for≥3 days and≥24 h before intubation(median duration of therapy:3 days)compared with standard of care.

关键词： patients mortality therapy

Some Characteristics of Treatment of Wastewater from Paper Production and Recycling Containing Lignin in Vietnam

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Journal of Environmental Science and Engineering(B) 2020年第4期9卷 133-138页

作者： bui Thi thu Ha Faculty of Environment HoChiMinh City University of Natural Resources and EnvironmentHo Chi Minh CityVietnam

Lignin is a difficult-to-treat pollutant in wastewater from paper production and paper *** lignin and lignin derivatives are useful materials in many different *** paper summarizes some characteristics of the lignin recovery process,lignin application and lignin *** the paper also presents some characteristics in paper wastewater treatment,paper recycling wastewater in Vietnam.

关键词： Lignin recovery coagulant chemical biological treatment wastewater treatment

Agrobacterium-Mediated Transformation of Cry8db Gene in Vietnam Sweet Potato Cultivar

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Journal of Life Sciences 2015年第6期9卷 262-271页

作者： Pham Bich Ngoc Vu Thi Lan Tran thu Trang Nguyen Hoai thuong Le thu Ngoc Chu Hoang Ha Le Tran Binh Institute of Biotechnology Vietnam Academy of Science and Technology 18-Hoang Quoc Viet Cau Giay Ha Noi 10000 Vietnam College of Science Thai Nguyen University Tan Thinh Thai Nguyen 23000 Vietnam University of Science and Technology of Ha Noi 18-Hoang Quoc Viet Cau Giay Ha Noi 10000 Vietnam

Sweet potato [Ipomoea batatas （L.） lam.] is an important food crop in the world as well as in Vietnam. It is well known as a recalcitrant crop for gene transformation and tissue culture because of its genotype dependent in vitro responses. In present study, Agrobacterium-mediated transformation of cry8Db from Bacillus thuringiensis into KB 1 sweet potato variety has been studied. The C58cv strain carrying a pBl 121 backbone which contained cry8Db delta-endotoxin gene regulated under 35 S CaMV prom oter, and the selection marker gene, neomycin phosphotransferase （npt11） gene, was subjected for plant transformation. Callus induced from shoot tips and leaf explants were inoculated and cocultured with A. tumefaciens. The selection occurred during callus producing and plant regenerating steps. A total of 201 transgenic putative plant lines were produced, and 21 transgenic lines were positively confirmed by PCR and finalized by Southern blot. Four putative transgenic lines confirming a single copy of the crySEIb gene were transferred into soil pots in greenhouse. Biological activity evaluation for the insecticidal capacity of these transgenic lines under controlled conditions showed that the level of infestation by sweet potato weevils （Cylasformicarius） in untransformed plants was higher than that of transgenic lines.

关键词： Sweet potato Agrobacterium tumefaciens plant transformation cry8Db sweet potato weevil resistance cylas formicarius.

Application of Regional Ocean Modeling System for Hydrodynamics in Binh Cang-Nha Trang Bay, Vietnam

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Journal of Marine Science 2019年第1期1卷 1-6页

作者： Pham Xuan Duong Phan Minh-thu bui Hong Long Dept.Marine Physics Institute of OceanographyVietnam Academy of Science and Technology (VAST)Nha TrangVietnam Dept.Marine Ecology Institute of OceanographyVASTNha TrangVietnam Graduate University of Science and Technology VASTVietnam

Based on the data collected at the Cau Da station, the Regional Ocean Modeling System (ROMS) is applied for hydrodynamics (e.g. circulation and temperature-salinity) in Binh Cang - Nha Trang Bay, Vietnam. The results present the several cases of hydrodynamic regimes in the Bay during two mainly monsoon seasons (northeast and southwest monsoons). The clearly hydrodynamic regime occurs in the bay due to the impacts of rivers and monsoon conditions. These changes could be contributed to the hydrodynamic systems and water exchanges, that support basic scientific information for sustainable development of Binh Cang - Nha Trang bay.

关键词： ROMS Binh Cang – Nha Trang Bay Hydrodynamics

Transformation CodA Gene to Lily Plants by Agrobacterium tumefaciences Mediated

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Journal of Agricultural Science and Technology(B) 2018年第6期8卷 375-381页

作者： bui Thi thu Huong Dong Huy Gioi Le Tran Binh Faculty of Biotechnology Vietnam National University of AgricultureTrau QuyGia Lam 12406HanoiVietnam Institute of Biotechnology Vietnam Academy of Science and TechnologyNghia TanCau Giay 11308HanoiVietnam

Glycinebetaine(GB),an osmotic substance,could improve some stress tolerance in *** gene,originating from bacteria,could translate choline oxidase which stimulates the synthesis of GB in *** create lily lines resistant to heat,Belladonna lily and Yelloween lily had been transferred CodA gene through Agrobacterium *** bacteria harbored a binary vector carrying the hygromycin phosphotransferase,choline oxidase(CodA)and intron-containingβ-glucuronidase(Gus)genes were co-cultivated with lily bulb scales *** result showed that most the bulb scales had developed into bulblets in a regulator-free growth medium,while some expressed the hygromycin-resistance,heat tolerance and Gus gene *** them,one line demonstrated primarily the transcription level expression through reverse transcription polymerase chain reaction(RT-PCR).Moreover,they were tested with the accumulation of GB which was evident that the transferred line had four times of GB volumes higher than that of wild *** original evidence could open a right approach to enhance stress tolerance in lily plants.

关键词： Agrobacterium tumefaciens CodA gene genetic transformation glycinebetaine lily stress tolerance in plants