1,464 research outputs found
Understanding the transmission dynamics of a large-scale measles outbreak in Southern Vietnam
No full textOBJECTIVES: Southern Vietnam experienced a large measles outbreak of over 26,000 cases during 2018-2020. We aimed to understand and quantify the measles spread in space-time dependence and the transmissibility during the outbreak. METHODS: Measles surveillance reported cases between January 2018 and June 2020, vaccination coverage, and population data at provinicial level were used. To illustrate the spatio-temporal pattern of disease spread, we employed the endemic-epidemic multivariate time series model decomposing measles risk additively into autoregressive, spatio-temporal, and endemic components. Likelihood-based estimation procedures were performed to determine the time-varying reproductive number Re of measles. RESULTS: Our analysis showed that the incidence of measles was associated with vaccination coverage heterogeneity and spatial interaction between provincial units. The risk of infections was dominated by between-province transmission (36.1% to 78.8%), followed by local endogenous transmission (4.1% to 61.5%). In contrast, the endemic behavior had a relatively small contribution (2.4% to 33.4%) across provinces. In the exponential phase of the epidemic, Re was above the threshold with a maximum value of 2.34 (95% CI: 2.20-2.46). CONCLUSION: Local vaccination coverage and human mobility are important factors contributing to the measles dynamics in Southern Vietnam, and the high risk of inter-provincial transmission is of most concern. Strengthening the disease surveillance is recommended, and further research is essential to understand the relative contribution of population immunity and control measures in measles epidemics.sponsorship: We would like to thank the VLIR-UOS for awarding T.H.T.N. a scholarship to study the Master of Epidemiology at the Univer-sity of Antwerp, Belgium. We are pleased to acknowledge the Pas-teur Institute in Ho Chi Minh City including the Board of Directors for supporting the research endeavor in terms of data use, col-leagues of the Outbreak Control Unit (Pham Duy Quang, Nguyen Thi Phuong Thuy, Tran Cong Kha, Doan Ngoc Minh Quan, Nguyen Quoc Kien, Tran Anh Tuan, Phan Thi Ngoc Uyen, Nguyen Viet Thinh, Hoang Thi Lien, and Phan Cong Hung), and the EPI Unit (Hoang Anh Thang, Chau Van Luom, Truong Cong Hieu, Vo Ngoc Quang, Nguyen Dieu Thuy, Nguyen Thi Huyen, Phan Thi Quynh Tram, Vien Dang Khanh Linh, Nguyen Thi Thu Trang, Nguyen Van Hoang, Tran Quang Trung, Trinh Trung Truc, Tran Thanh Hai) for their huge efforts and enthusiasm in case monitoring, surveillance and contact tracing, outbreak investigation, and launching the sup-plementary immunization activities during the measles outbreak. We would also like to acknowledge the large contribution of 20 Provincial Centers for Disease Control and Prevention in two cities and 18 provinces in Southern Vietnam in the EPI National Project. (VLIR-UOS)status: Publishe
Safer selection and use of pesticides: Integrating risk assessment, monitoring and management of pesticides
No full textCrop Production/Industries,
Nguyên nhân và kết quả của thái độ đối với trang web bán lẻ
No full textThis study investigates some key determinants affecting behavioral intention to online purchase. The model was tested by a sample of 167 users of internet in HCM city. The results show that currency, product information, trust, customer support significantly impact customers’ attitudes towards a retailing website. In addition, results also show that ease of use and entertainment do not affect customers’ attitudes towards a retailing websiteNghiên cứu này xem xét một số yếu tố ảnh hưởng đến xu hướng mua hàng qua mạng tại Việt Nam. Mô hình được kiểm định với 167 khách hàng tại TP.HCM. Kết quả nghiên cứu cho thấy tính cập nhật, thông tin sản phẩm, tính tin cậy và hỗ trợ khách hàng có ảnh hưởng đến thái độ đối với trang web bán lẻ và xu hướng mua hàng qua mạng. Kết quả còn cho thấy tính dễ sử dụng và tính giải trí không ảnh hưởng đến thái độ đối với trang web bán lẻ. Thái độ đối với trang web bán lẻ có ảnh hưởng đến xu hướng hành vi mua hàng qua mạng
Éponges intercoditales de Nha Trang (Viet Nam)
No full textThanks to the effort of many spongologists from worldwide, we know the most common sponges in the Indo-Pacific area. The author gives a description of 28 intertidal sponges collected in Nha Trang, Vietnam.Reprinted as: Institut Océanographique de Nha Trang Vietnam, Contribution, nr 5
(Table 2) Fluorescence parameters of phytoplankton in the Nha Trang Bay on 24-25 March 1998
No full text(Table 2) Fluorescence parameters of phytoplankton in the Nha Trang Bay on 24-25 March 199
Impact of recent coastal development and human activities on Nha Trang Bay, Vietnam : evidence from a Porites lutea geochemical record
No full textNha Trang Bay (NTB) is located on the Central Vietnam coast, western South China Sea. Recent coastal development of Nha Trang City has raised public concern over an increasing level of pollution within the bay and degradation of nearby coral reefs. In this study, multiple proxies (e.g., trace metals, rare earth elements (REEs), and Y/Ho) recorded in a massive Porites lutea coral colony were used to reconstruct changes in seawater conditions in the NTB from 1995 to 2009. A 14-year record of REEs and other trace metals revealed that the concentrations of terrestrial trace metals have increased dramatically in response to an increase in coastal development projects such as road, port, and resort constructions, port and river dredging, and dumping activities since 2000. The effects of such developmental processes are also evident in changes in REE patterns and Y/Ho ratios through time, suggesting that both parameters are critical proxies for marine pollution
Syntax of Vietnamese Aspect
No full textThe aim of this thesis is two-fold: to develop an articulated Vietnamese clause structure in two syntactic domains: VP-external and VP-internal in the spirit of generative grammar, and to see how this functional architecture is supported empirically from the perspective of second language acquisition.
To address theoretical issues, on the one hand, it brings together interesting semantic and syntactic contrasts of aspectual morphemes in Vietnamese, i.e., the distributional and interpretative independence of Vietnamese tense and aspect as well as the way they interact with other syntactic phenomenon such as negation, quantification and definiteness. On the other hand, it reveals to what extent the mechanisms that Vietnamese recruits to encode aspect are different from those employed in Indo- European languages and other areally-related languages, especially including Chinese.
Based on a detailed semantic-syntactic investigation of Vietnamese aspect, the thesis sets out the properties that need to be acquired by Chinese learners. It distinguishes between those properties which are acquirable without difficulties and those that are ‘problematic’ in order to verify the proposed Vietnamese functional clause. It also sets out to validate some recent hypotheses in the realm of second language acquisition.
The thesis is organized as follows. Chapter 1 sets out the theoretical approach of the thesis. Chapter 2 systematically reviews a set of semantic and syntactic studies on aspect that are relevant to the discussion. Chapter 3 lays out previous research on Vietnamese tense and aspect as points of departure for my proposals. Chapters 4 and 5 are devoted to an analysis of how tense and aspect are realized in Vietnamese both pre- and post-verbally. Chapter 6 provides a brief comparison between Vietnamese and Chinese aspectual systems, focusing on the particular properties investigated in the following chapter. Chapter 7 presents a set of experiments examining Chinese learners’ acquisition of Vietnamese aspect-related constructions, these shed light on current generativist hypotheses about second language acquisition. Chapter 8 concludes the thesis
Tam roi Phranang Luat Khao yon adit su muang Trang
No full textThe author narrates the tale concerning Phranang Luat Khao. The story of Phranang Luat Khao is recounted in many southern provinces, including Phatthalung and Trang. According to the story, Phranang Luat Khao and her husband, Phraya Kuman, were the great patronages of Buddhism. People believed that they built a number of Buddhist temples and Buddha statues in the Southern region, especially in Trang province
(Table 1) Phytoplankton biomass and concentration of chlorophyll a in the Nha Trang Bay on 24-25 March 1998
No full text(Table 1) Phytoplankton biomass and concentration of chlorophyll a in the Nha Trang Bay on 24-25 March 199
Sự thỏa mãn của khách hàng đối với trang web mua sắm theo nhóm qua mạng Hotdeal.vn
No full textNghiên cứu nhằm mục tiêu nhận biết mức độ thỏa mãn của khách hàng và các yếu tố ảnh hưởng đến mức độ thỏa mãn của khách hàng đối với trang web mua sắm theo nhóm qua mạng Hotdeal.vn. Thang đo EtailQ được sử dụng.
Kết quả phân tích dữ liệu cho thấy mức độ thỏa mãn của khách hàng đối với trang Hotdeal.vn ở mức trung bình. Kiểm định độ tin cậy Cronbach’s Alpha, phân tích nhân tố và phân tích hồi quy đa biến cho kết quả có 4 thành phần chính tác động đến sự thỏa mãn của khách hàng sử dụng trang Hotdeal.vn theo thứ tự là “Độ tin cậy”, “Dịch vụ khách hàng”, “Thiết kế trang web”, “Độ an toàn”. Từ những kết quả thu được, nghiên cứu đã có những kiến nghị nhằm cải thiện và nâng cao chất lượng dịch vụ trang Hotdeal.vn nhằm gia tăng sự thỏa mãn của khách hàng
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