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2011年以来越南与南非贸易合作研究

2011年以来越南与南非贸易合作研究

作者：邓玉龄（LINH dang ngoc LINH）云南大学

学位级别：硕士

从20世纪下半叶到现在,贸易自由化的趋势一直非常强烈。面对全球化浪潮,各国正不断努力扩大各种双边和多边合作活动,越南也不例外。贸易活动在越南经济中扮演着重要角色。但是,在国际贸易背景下,特别是国际经济在多方面发生变化的情况下... 详细信息

从20世纪下半叶到现在,贸易自由化的趋势一直非常强烈。面对全球化浪潮,各国正不断努力扩大各种双边和多边合作活动,越南也不例外。贸易活动在越南经济中扮演着重要角色。但是,在国际贸易背景下,特别是国际经济在多方面发生变化的情况下,越南国际贸易伙伴的结构也发生了一定的变动。除了与美国和欧盟等传统伙伴保持和发展贸易合作关系外,越南还一直积极拓展与新伙伴的关系。在最近一段时间,越南政府为扩大与非洲,特别是与越南在非洲多年来的第一大贸易伙伴——南非的合作关系作出了巨大努力。发展与南非的贸易关系将是越南深入非洲12亿人口市场中的重要一步。除此之外,贸易合作领域中的成功也为两国之间的文化、政治和经济合作活动创造了一定的便利。本论文的主要内容如下:首先,论文对越南与南非在1992-2010年期间的贸易关系历史进行概述,然后与1992-2010年阶段进行比较,论文对2011-2018年期间两国间的贸易发展现状进行了分析,同时指出了两国主要出口产品的贸易强度指数和显示性比较优势指数。在分析了现状之后,论文得出了2011-2018年期间两国间贸易关系的共同特点。其次,论文指出了开展两国贸易关系的有利条件与制约因素。第三,论文通过分析影响双边贸易关系的潜在因素,对未来越南与南非之间的贸易关系进行了预测和展望。最后,论文根据一系列描述性分析和定量性分析结果,从政府和企业两个层面分别给予了促进越南对南非双边贸易发展的有效性建议。通过分析越南与南非自2011年以来的贸易关系,论文得出以下四个主要特点:首先,在两国间贸易情况的现实基础之上,两国之间的贸易关系完全有能力继续扩大)。第二,双边贸易关系将在未来呈现出增长趋势,各方将继续专注于生产和出口两国具有更大比较优势的商品,这点将通过RCA指数来体现。第三,总体而言,越南和南非仍然不是彼此的战略贸易伙伴,但是双方之间的合作潜力巨大。最后,诸如CPTPP、RCEP、AEC、TFTP和AFCFTA等多边自由贸易协定的出现将对未来两国的贸易产生影响。

关键词：越南南非贸易合作

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越南玉米产业发展概况

广东农业科学 2009年第8期36卷 371-372页

作者：张衍荣赵秀娟 dang ngoc HA 王芳李智军广东省农科院作物研究所广东广州510640 广东科贸职业学院广东广州510430 越南农业科学院

对越南发展玉米的自然条件、玉米发展历程和国家育种、栽培及今后的发展方向进行了介绍和分析,以期为我国开展玉米产业的国际合作提供借鉴。

关键词：越南玉米产业

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微电网电压稳定控制策略研究

机电工程 2015年第1期32卷 82-88页

作者：艾欣 LE Kim Anh dang ngoc Huy 华北电力大学新能源电力系统国家重点实验室北京102206

针对微电网中的分布式电源自身的不稳定性将导致微电网电压不稳定的问题,给出了一种交直流混联结构微电网的典型系统,建立了双向AC/DC变流器(整流模式和逆变模式)、分布式电源逆变器及其控制系统的数学模型,提出了一种新型的双向AC/DC... 详细信息

针对微电网中的分布式电源自身的不稳定性将导致微电网电压不稳定的问题,给出了一种交直流混联结构微电网的典型系统,建立了双向AC/DC变流器(整流模式和逆变模式)、分布式电源逆变器及其控制系统的数学模型,提出了一种新型的双向AC/DC变流器控制方法,根据微电网的电压与功率关系,设计了一种基于电压外环、电流内环和功率环等的反馈控制器,并给出了相应的下垂控制策略。通过理论分析分布式电源的功率、电压特性及其对微电网电压稳定性的影响,提出了能够有效抑制分布式电源功率波动、提高微电网电压质量的控制策略。研究结果表明,该双向AC/DC变流器能稳定地控制微电网电压,具有很好的稳态性。

关键词：分布式电源微电网电压稳定双向AC/DC变流器控制策略

基于分层控制的微电网电压和频率控制策略研究

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华北电力技术 2015年第6期 6-13页

作者： dang ngoc Huy 艾欣 Le Kim Anh 华北电力大学新能源电力系统国家重点实验室北京102206

针对分布式电源接入微电网后对频率和电压产生的影响,提出了一种分层控制的方法。根据微电网电压与功率的关系、孤岛和并网运行的特性,分层控制分为2层。其中,初级控制采用了下垂控制的方法,提出了基于电压外环、电流内环和功率环的反... 详细信息

针对分布式电源接入微电网后对频率和电压产生的影响,提出了一种分层控制的方法。根据微电网电压与功率的关系、孤岛和并网运行的特性,分层控制分为2层。其中,初级控制采用了下垂控制的方法,提出了基于电压外环、电流内环和功率环的反馈控制器。二级控制通过对初级信号进行控制,重新控制逆变器的输出电压幅值和频率,使之达到平衡,实现系统运行的稳定性。为了验证分层控制方法的可靠性,使用Matlab/Simulink软件进行仿真,分析了微电网运行中各分布式电源的功率、电压和频率的变化规律。仿真结果表明,微电网中分布式电源的分层控制策略性能良好。

关键词：分布式电源微电网下垂控制分层控制控制策略

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微电网的分层控制研究

现代电力 2014年第5期31卷 1-6页

作者：黎金英艾欣邓玉辉华北电力大学电气与电子工程学院北京102206

微电网技术具有许多优点,然而微电网中的分布式电源自身的不稳定性将导致微电网的运行控制困难。针对此问题,提出了分层控制方法。这种控制方法将分层控制分为三层,每一层独立完成自身的控制任务,通过通信通道向下层传达命令,且传达命... 详细信息

微电网技术具有许多优点,然而微电网中的分布式电源自身的不稳定性将导致微电网的运行控制困难。针对此问题,提出了分层控制方法。这种控制方法将分层控制分为三层,每一层独立完成自身的控制任务,通过通信通道向下层传达命令,且传达命令过程中不会影响系统的稳定性。基于下垂控制方法,微电网分层控制的第一层为分布式电源和负荷控制,第二层为在第一层控制信号基础上的频率和电压幅值控制,第三层为微电网功率和主网功率控制。利用Matlab/simulink对微电网接入主电网进行建模仿真,结果表明分层控制方法能够较好地实现对微电网的控制。

关键词：分布式电源微电网并网运行下垂控制分层控制

Fluctuating temperature modifies heat-mortality association around the globe

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The Innovation 2022年第2期3卷 65-72页

作者： Yao Wu Bo Wen Shanshan Li Antonio Gasparrini Shilu Tong Ala Overcenco Ales Urban Alexandra Schneider Alireza Entezari Ana Maria Vicedo-Cabrera Antonella Zanobetti Antonis Analitis Ariana Zeka Aurelio Tobias Barrak Alahmad Ben Armstrong Bertil Forsberg CarmenÍñiguez Caroline Ameling César De la Cruz Valencia ChristoferÅström Danny Houthuijs Do Van Dung Dominic Royé Ene Indermitte Eric Lavigne Fatemeh Mayvaneh Fiorella Acquaotta Francesca de’Donato Francesco Sera Gabriel Carrasco-Escobar Haidong Kan Hans Orru Ho Kim Iulian-Horia Holobaca Jan Kyselý Joana Madureira Joel Schwartz Klea Katsouyanni Magali Hurtado-Diaz Martina SRagettli Masahiro Hashizume Mathilde Pascal Micheline de Sousa Zanotti Stagliorio Coélho Noah Scovronick Paola Michelozzi Patrick Goodman Paulo Hilario Nascimento Saldiva Rosana Abrutzky Samuel Osorio Tran ngoc dang Valentina Colistro Veronika Huber Whanhee Lee Xerxes Seposo Yasushi Honda Michelle L.Bell Yuming Guo Department of Epidemiology and Preventive Medicine School of Public Health and Preventive MedicineMonash UniversityMelbourne 3004Australia Climate Air Quality Research UnitSchool of Public Health and Preventive MedicineMonash UniversityMelbourne 3004Australia Department of Public Health Environments and SocietyLondon School of Hygiene&Tropical MedicineLondon WC1E 7HTUK Centre for Statistical Methodology London School of Hygiene&Tropical MedicineLondon WC1E 7HTUK Centre on Climate Change&Planetary Health London School of Hygiene&Tropical MedicineLondon WC1E 7HTUK Shanghai Children’s Medical Centre Shanghai Jiao Tong UniversityShanghai 200025China School of Public Health Institute of Environment and Human HealthAnhui Medical UniversityHefei 230032China Center for Global Health Nanjing Medical UniversityNanjing 211166China School of Public Health and Social Work Queensland University of TechnologyBrisbane 4000Australia National Agency for Public Health of the Ministry of Health Labour and Social Protection of the Republic of MoldovaChisinau MD-2009Republic of Moldova Institute of Atmospheric Physics Czech Academy of SciencesPrague 14100Czech Republic Faculty of Environmental Sciences Czech University of Life SciencesPrague 16500Czech Republic Institute of Epidemiology Helmholtz Zentrum M€unchen-German Research Center for Environmental HealthNeuherberg 85747Germany Faculty of Geography and Environmental Sciences Hakim Sabzevari UniversitySabzevar ***Iran Institute of Social and Preventive Medicine University of BernBern 3012Switzerland Oeschger Center for Climate Change Research University of BernBern 3012Switzerland Department of Environmental Health Harvard T.H.Chan School of Public HealthHarvard UniversityBostonMA 02115USA Department of Hygiene Epidemiology and Medical StatisticsNational and Kapodistrian University of AthensAthens 11527Greece Institute for Environment Healthand SocietiesBrunel University LondonLondon UB83PNUK Institute of Environmental Assessment and

Studies have investigated the effects of heat and temperature variability(TV)on ***,few assessed whether TV modifies the heat-mortality *** on daily temperature and mortality in the warm season were collected from 717 locations across 36 *** was calculated as the standard deviation of the average of the same and previous days’minimum and maximum temperatures.

关键词： deviation modif heat

Assessing Asian Economies Renewable Energy Consumption Efficiency Using DEA with Undesirable Output

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Computer Systems Science & Engineering 2022年第10期43卷 347-362页

作者： Chia-Nan Wang ngoc-Ai-Thy Nguyen Thanh-Tuan dang Jing-Wein Wang Department of Industrial Engineering and Management National Kaohsiung University of Science and TechnologyKaohsiung80778Taiwan Department of Logistics and Supply Chain Management Hong Bang International UniversityHo Chi Minh723000Vietnam Institute of Photonics Engineering National Kaohsiung University of Science and TechnologyKaohsiung80778Taiwan

Along with vast non-fossil potential and significant expertise,there is a question of whether Asian nations are attaining efficient consumption and exploitation of renewable *** this perspective,the paper aims to evaluate the efficiency of 14 potential Asia countries in renewable energy consumption during the six-year periods(2014-2019).In analyzing the performance of the renewable energy sector,the data envelopment analysis(DEA)with an undesirable output model approach has been widely utilized to measure the efficiency of peer units compared with the best practice *** consider four inputs and two outputs to a DEA-based efficiency *** force,total energy consumption,share of renewable energy,and total renewable energy capacity are *** outputs consist of CO_(2)emissions as an undesirable output and gross domestic product as a desirable *** results show that United Arab Emirates,Saudi Arabia,Japan,and South Korea consistently outperform in the evaluation,achieving perfect efficiency scores during the research *** is found to have the lowest average efficiency of renewable energy utilization.

关键词： Asia renewable energy efficiency frontier data envelopment analysis bad output

An Ontology-Based Question Answering System for University Admissions Advising

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Intelligent Automation & Soft Computing 2023年第4期36卷 601-616页

作者： Thi Thanh Sang Nguyen dang Huu Trong Ho ngoc Tram Anh Nguyen School of Computer Science and Engineering International UniversityVNU-HCMCVietnam National UniversityHo Chi Minh CityVietnam

Question-Answer systems are now very popular and crucial to support human in automatically responding frequent questions in manyﬁ***,these systems depend on learning methods and training ***,it is necessary to prepare such a good dataset,but it is not an easy *** ontol-ogy-based domain knowledge base is able to help to reason semantic information and make effective answers given user *** study proposes a novel chatbot model involving ontology to generate efﬁcient responses automatically.A case study of admissions advising at the International University–VNU HCMC is taken into account in the proposed chatbot.A domain ontology is designed and built based on the domain knowledge of university admissions using Protégé.The Web user interface of the proposed chatbot system is developed as a prototype using *** includes a search engine reasoning the ontology and generat-ing answers to users’*** experiments are carried out to test how the system reacts to different ***ﬁrst experiment examines questions made from some templates,and the second one examines normal questions taken from frequent *** results have shown that the ontology-based chatbot can release meaningful and long *** results are analysed to prove the proposed chatbot is usable and promising.

关键词： Ontology chatbots answer-question systems domain knowledge base admissions advising

Is convenience really king? Comparative evaluation of catastrophic costs due to tuberculosis in the public and private healthcare sectors of Viet Nam: a longitudinal patient cost study

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贫困所致传染病(英文) 2024年第2期13卷 1-12页

作者： Nguyen Hoa Binh Quang Vo Luan Nguyen Forse Rachel Jeanette Wiemers Anja Maria Christine Huynh Huy Ba Dong Thuy Thi Thu Phan Yen Thi Hoang Creswell Jacob dang Thi Minh Ha Nguyen Lan Huu Shedrawy Jad L?nnroth Knut Nguyen Tuan Dinh Van Dinh Luong Annerstedt Kristi Sidney Codlin Andrew James National Lung Hospital Ha Noi Viet Nam Friends for International TB Relief Ha Noi Viet Nam Department of Global Public Health WHO Collaboration Centre On Tuberculosis and Social Medicine Karolinska Institute Stockholm Sweden Stop TB Partnership Geneva Switzerland Pham ngoc Thach Hospital Ho Chi Minh City Viet Nam

Background In Viet Nam, tuberculosis (TB) represents a devastating life-event with an exorbitant price tag, partly due to lost income from daily directly observed therapy in public sector care. Thus, persons with TB may seek care in the private sector for its flexibility, convenience, and privacy. Our study aimed to measure income changes, costs and catastrophic cost incurrence among TB-affected households in the public and private *** Between October 2020 and March 2022, we conducted 110 longitudinal patient cost interviews, among 50 patients privately treated for TB and 60 TB patients treated by the National TB Program (NTP) in Ha Noi, Hai Phong and Ho Chi Minh City, Viet Nam. Using a local adaptation of the WHO TB patient cost survey tool, participants were interviewed during the intensive phase, continuation phase and post-treatment. We compared income levels, direct and indirect treatment costs, catastrophic costs using Wilcoxon rank-sum and chi-squared tests and associated risk factors between the two cohorts using multivariate *** The pre-treatment median monthly household income was significantly higher in the private sector versus NTP cohort (USD 868 vs USD 578;P=0.010). However, private sector treatment was also significantly costlier (USD 2075 vs USD 1313;P=0.005), driven by direct medical costs which were 4.6 times higher than costs reported by NTP participants (USD 754 vs USD 164;P<0.001). This resulted in no significant difference in catastrophic costs between the two cohorts (Private: 55% vs NTP: 52%;P=0.675). Factors associated with catastrophic cost included being a single-person household [adjusted odds ratio [(aOR=13.71; 95% confidence interval (CI): 1.36–138.14;P=0.026], unemployment during treatment (aOR=10.86; 95%CI: 2.64–44.60;P<0.001) and experiencing TB-related stigma (aOR=37.90; 95%CI: 1.72–831.73;P=0.021).Conclusions Persons with TB in Viet Nam face similarly high risk of catastrophic costs whether treated in the

关键词： Tuberculosis Patient cost Catastrophic cost Private sector Comparative analysis Viet Nam