Journal of Science and Technology
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Đang duyệt Journal of Science and Technology theo Nhan đề
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- Tài liệuA Reformed K-Nearest Neighbors Algorithm for Big Data Sets(Trường Đại học Nguyễn Tất Thành (Tạp chí Khoa học công nghệ NTT), 2018-03-08) Vo, Ngoc Phu; Vo, Thị Ngoc TranIn This Research, We Propose An Improvement To K-NN To Process Big Datasets In A Shortened Execution Time. The Reformed K-Nearest Neighbors Algorithm (R-K-NN) Can Be Implemented On Large Datasets With Millions Or Even Billions Of Data Records. R-K-NN Is Tested On A Data Set With 500,000 Records. The Execution Time Of R-K-NN Is Much Shorter Than That Of K-NN. In Addition, R-K-NN Is Implemented In A Parallel Network System With Hadoop Map (M) And Hadoop Reduce (R).
- Tài liệuA Sting Algorithm and Multi-dimensional Vectors Used for English Sentiment Classification in a Distributed System(Trường Đại học Nguyễn Tất Thành (Tạp chí khoa học công nghệ NTT), 2017-12-20) Vo, Ngoc Phu; Vo, Thi Ngoc TranIn this research, we have proposed a new model for Big Data sentiment classification in the parallel network environment - a Cloudera system with Hadoop Map (M) and Hadoop Reduce (R). Our new model has used a Statistical Information Grid Algorithm (STING) with multi-dimensional vector and 2,000,000 English documents of our English training data set for English document-level sentiment classification. Our new model can classify sentiment of millions of English documents based on many English documents in the parallel network environment. However, we tested our new model on our testing data set (including 1,000,000 English reviews, 500,000 positive and 500,000 negative) and achieved 83.92% accuracy
- Tài liệuAn analytical approach in accounting for social values of ecosystem services in a Ramsar site:(Trường Đại học Nguyễn Tất Thành (Tạp chí Khoa học công nghệ NTT), 2017-12-28) Ho, Huu Loc; Nguyen, Thi Hong Diep; Vo, Thanh Tuan; Yoshihisa ShimizudPresented a case study in exploring relevant ES and EDS within the context of a protected area using non-monetary methods with the aid of the local community. In particular, through deliberative mapping approach, the manuscript strived to locate, quantify, and assess a full range of relevant ES and EDS as perceived by local inhabitants across the landscape of U Minh Thuong National Park (UMTNP), Vietnam. Within the scope of this paper, we also delved into how socio-cultural perceptions and preferences towards these natural resources diverge among groups of respondents. Through the presented research, we strived to consolidate the baseline understanding regarding the ES profile of the research area with relevant social insights, paving the way for the design and implementation of sustainable management strategies. Finally, this manuscript also sought to present a practical measure to account for social dimensions and their relevance to the general assessment of ES..
- Tài liệuAn Assessment on Impacts of Online Education on Training Quality and Satisfaction of Tourism Undergraduate Students in A Private University and Managerial Implications for Educators(Trường Đại học Nguyễn Tất Thành (Tạp chí Khoa học công nghệ), 2021-09-27) Pham, Nguyen Trong Nhan; Nguyen, Tran Ngoc Phi; Le, Truong Nguyen; Nguyen, Mai Lan; Nguyen, Thi Thuy PhuongThis study was conducted to explore the effects of online learning on learning quality by utilizing a survey sample of undergraduate students in the field of tourism. Through quantitative data analysis, the research results show that the majority of respondents have an above-neutral level of satisfaction (above 3) when participating in answering questions about factors affecting online learning such as the quality of online learning, e-learning activities, criteria for assessing learning results, education and training issues, influencing factors and impacts of virtual tourism on tourism students. The research results might give managerial implications to universities adopting online learning about policies and measures to improve the school's educational quality during the pandemic
- Tài liệuẢnh hưởng của đặc điểm cá nhân và đặc điểm tổ chức đến năng suất nghiên cứu khoa học của giảng viên Trường đại học Nguyễn Tất Thành(Tạp chí Thiết bị giáo dục, 2021-07-05) Nguyễn, Lan Phương; Phan, Bùi Gia ThủyThis study aims to estimate the e ect ofpersonal and organizational characteristics on the researchproductivity of lecturers at Nguyen Tat Thanh University, thereby recommending appropriate solutions inimproving research productivity at this university. Analyzing I41 lecturer survey questionnaires of6 differentdisczplines, including technology and socialfields. wefound that there are diflerences in research productivitybetween technical and social fields; obstacles to carrying out scientific research interrupt the research productivity, and the academic environment has a positive relation to the scientific research performance oflecturers. More specifically there exists a nonlinear relationship between the age oflecturers and research productivity
- Tài liệuApproaching human vision perception to designing visual graph in data visualization(Trường Đại học Nguyễn Tất Thành (Tạp chí Khoa học công nghệ NTT), 2020-03) Tran, Phuoc Vinh; Le, Xuan TruongThis research studies the characteristics of human vision perception and the relationships between data variables of dataset to constitute cube models representing dataset as a graph on the cube. The research proposes the process designing multidimensional graph considered as structural graph on cube model to represent multivariate data. Structural graph is designed in the light of the relationships between data variables and human vision perception. After mapping structural graph onto computer screen, the graph is integrated retinal variables to improve objectively visual features and respond subjectively human perception of vision
- Tài liệuBảo tồn nguồn gen cây Hồng Sim (Rhodomyrtus tomentosa) tại Vườn Quốc gia Phú Quốc(Trường Đại học Nguyễn Tất Thành (Tạp chí Khoa học công nghệ NTT), 2020-03-30) Trần, Tuấn Kiệt; Võ, Thanh SangNghiên cứu bảo tồn nguồn gen Hồng Sim tại Vườn Quốc gia Phú Quốc, thống kê 28 hộ dân trồng Hồng Sim cho thấy 50% hộ canh tác với diện tích nhỏ hơn 1 ha, trong khi chỉ 4% hộ trồng trên 5 ha, kết quả khảo sát hình thái thân, lá hoa quả và hạt của Hồng Sim được ghi nhận, đặc biệt khoảng 1 ha Hồng Sim mọc tự nhiên tại Ấp Bãi Thơm - Xã Bãi Thơm đã được khoanh vùng để bảo tồn và 2000 m2, Hồng Sim với mật độ 500 cây ha được trồng bảo tồn thành công tại Ấp Xóm Mới – Xã Bãi Thơm, kết quả nghiên cứu góp phần bảo tồn gen Hồng Sim và giúp người dân có ý thức bảo vệ Hồng Sim Phú Quốc
- Tài liệuCác yếu tố ảnh hưởng đến ý định sử dụng ngân hàng số tại Thành phố Hồ Chí Minh(Trường Đại học Nguyễn Tất Thành (Khoa Tài chính kế toán), 2022-02-19) Nguyễn, Thị Mỹ ĐiểmNghiên cứu nhằm đánh giá các yếu tố ảnh hưởng đến ý định sử dụng ngân hàng số tại Thành phố Hồ Chí Minh, với việc phân tích về các nghiên cứu trước đây để xây dựng một mô hình nghiên cứu để điều tra các yếu tố ảnh hưởng đến ý định sử dụng kỹ thuật số dịch vụ ngân hàng tại Thành phố Hồ Chí Minh, nghiên cứu cũng đề xuất một số khuyến nghị để giúp cải thiện ý định sử dụng các dịch vụ ngân hàng kỹ thuật số ở Thành phố Hồ Chí Minh
- Tài liệuChuyển đổi số trong giáo dục đại học:(Đại học Thái Nguyên, 2021-05-21) Dương, Thái Hà; Hà, Trọng Quỳnh; Phạm, Thị Tuấn LinhNghiên cứu tổng quan phải đáp ứng các tiêu chí: có nội dung về chuyển đổi số trong giáo dục đại học, viết bằng tiếng Anh và có thể tiếp cận toàn văn. Tổng cộng có 24 bài báo được sử dụng để nghiên cứu tổng quan. Dựa vào các kết quả của nghiên cứu tổng quan này, nghiên cứu thực nghiệm trong tương lai có thể xác định và đánh giá các yếu tố ảnh hưởng đến công tác triển khai hoạt động chuyển đổi số trong giáo dục đại học
- Tài liệuDetermining factors affecting the decision to use e-banking mobile applications in Ho Chi Minh City(Trường Đại học Nguyễn Tất Thành (Khoa Tài chính kế toán), 2022-04) Nguyen, Ngoc HoaFollowing the outbreak of COVID-19 in 2021, Ho Chi Minh City was placed under quarantine. This has resulted in a surge in demand for information technology for services provided by banks. Particularly, a series of banks have launched smartphone application services to serve their customers. Although many banks have provided smartphone application services before, the numbers of users and transactions were low, despite their many conveniences. The growth of smartphone application services provided by banks is negatively impacted by a number of factors.
- Tài liệuEnglish sentiment classification using a Gower-2 coefficient and a genetic algorithm With a fitness-proportionate selection in a Parallel network environment(Trường Đại học Nguyễn Tất Thành (Tạp chí Khoa học công nghệ NTT), 2018-02-28) Vo, Ngoc Phu; Vo, Thi Ngoc TranWe have already studied a data mining field and a natural language processing field for many years. There are many significant relationships between the data mining and the natural language processing. Sentiment classification Has HAd many crucial contributions to many different fields in everyday life, such as in political Activities, commodity production, and commercial Activities. A new model using a Gower-2 Coefficient (HA) and a Genetic Algorithm (GA) with a fitness function (FF) which is a Fitness-proportionate Selection (FPS) has been proposed for the sentiment classification. This can be applied to a big data.
- Tài liệuEnglish Sentiment Classification using Only the Sentiment Lexicons with a Johnson Coefficient in a Parallel Network Environment(Trường Đại học Nguyễn Tất Thành (Tạp chí Khoa học công nghệ NTT), 2017-12-20) Vo, Ngoc Phu; Vo, Thi Ngoc TranSentiment classification is significant in everyday life, such as in political activities, commodity production and commercial activities. In this survey, we have proposed a new model for Big Data sentiment classification. We use many sentiment lexicons of our basis English Sentiment Dictionary (bESD) to classify 5,000,000 documents including 2,500,000 positive and 2,500,000 negative of our testing data set in English. We do not use any training data set in English
- Tài liệuEnhanced adsorption of methylene blue onto graphene oxide-doped XFe2O4 (X 5Co, Mn, Ni) nanocomposites: kinetic, isothermal, thermodynamicand recyclability studies(Trường Đại học Nguyễn Tất Thành (Tạp chí Khoa học công nghệ NTT), 2017-10-30) Bach, Long Giang; Tran, Van Thuan; Nguyen, Duy Trinh; Pham, Van Thinh; Do, Sy TrungAbstract The nanocomposites XFe2O4/GO with various metal sites (X = Co, Mn, and Ni) were successfully synthesized via the polymerized complex method. The XFe2O4/GO family was characterized using X-Ray diffraction analysis, scanning electron microscopy (SEM), and a vibrating sample magnetometer. We also investigated the effect of three fundamental parameters (initial concentration, dosage, and pH) on the removal of methylene blue using the response surface methodology. A high F value, very low P value (\ 0.00001), a non-significant lack of fit, and the determination coefficient (R2 [ 0.95) demonstrated a strong corre- lation between experimental and predicted values of the responses. The predicted optimal conditions for maximum removal efficiency were easily determined to adhere to the following trend for actual test experiments: MnFe2O4/GO (60.1%) \ CoFe2O4/GO (80.3%) \ NiFe2O4/GO (87.7%).
- Tài liệuGenetic Diversity of a Novel Oil Crop, Camellia brevistyla, Revealed by ISSR DNA Markers(Hiệp hội Hàn Quốc, 2017-06-19) Mong-Huai Su; Te-Hua Hsu; Chun-Neng Wang; Kuan-Hung LinCluster analysis revealed seven groups of populations plus one outlier (C. kissii). Five individuals from two populations in the southern region were grouped into cluster V, and six populations from both regions were grouped into cluster VII. The remaining populations from the northern region were separated into different clusters from V and VII. Results of an analysis of molecular variance indicated that the variation within populations (75%) was predominantly greater than variations among counties (18%) and among regions (7%). Overall, the gene flow (Nm = 0.509) estimated from genetic differentiation (Gst = 0.534) suggested that gene flow among regions was limited. Higher genetic diversity (H = 0.317), Shannon’s index (I = 0.477), and gene flow (Nm = 0.538) of populations were found in the northern region compared to the southern region. The DNA sequences of C. brevistyla amplified by two oil-biosynthesis genes showed 99-100% homology with those of C. oleifera. Camellia brevistyla populations are highly differentiated and can serve as a basis for the food oil industry as a germplasm resource.
- Tài liệuGiải pháp nâng cao nhận thức cho người dân khu vực đô thị tham gia chính quyền điện tử tại Phường An Hội, Thành Phố Bến Tre, Tỉnh Bến Tre(Tạp chí Thiết bị Giáo dục, 2021-10-24) Nguyễn, Thị Thúy Phượng; Nguyễn, Trần Ngọc Phi; Phạm, Nguyễn Trọng Nhân; Đặng, Mai Giang TânThe article presents the situation and solutions of raising the awareness for people in urban areas participating in e-government in An Hoi ward, Ben Tre city, Ben Tre province.
- Tài liệuHigh Photocatalytic Activity of Oliver-Like BiVO4 for Rhodamine B Degradation under Visible Light Irradiation(Trường Đại học Nguyễn Tất Thành, 2018-02-01) Nguyen, Huu Vinh; Tran, Van Thuan; Do, Sy Trung; Nguyen, Duy TrinhReport the facial synthesis of BiVO4 crystals with different morphologies by the solvothermal and hydrothermal process. The phase structure and morphology as-synthesized samples were characterized by XRD, FE-SEM, and UV-vis DRS spectroscopy. We also investigated the photocatalytic activity of BiVO4 for the decomposition of rhodamine B (RhB) under visible light irradiation. The results showed that oliver-like BiVO4 was obtained when using the mixed solvent of ethylene glycol and water while starflower-like BiVO4 was obtained using the mixed solvent of ethylene glycol monomethyl ether and water. The hydrothermal evolution process the BiVO4 product with a rod-like morphology. Oliver-like BiVO4 with pure monoclinic scheelite phase and high specific surface area exhibits efficient photodegradation of RhB (k = 7.82x10-3 min-1).
- Tài liệuHoạt động nghiên cứu khoa học của giảng viên Trường Đại Học Nguyễn Tất Thành(Tạp chí Thiết bị giáo dục, 2021-07-05) Trần, Ái Cầm; Nguyễn, Hoàng Sơn; Phan, Bùi Gia ThủyThis study aims to analyze and compare the differences in awareness of the importance and status of scientific research activities of lecturers at Nguyen Tat Thanh University for gender and disciplines. Analyzing 141 lecturer survey questionnaires of 6 different disciplines, including technology and social fields, we found that the scientific research activities of lecturers are not commensurate with the development orientation of the school. In addition, there were no differences in terms of awareness and scientific research activities between male and female lecturers, but there were significant differences between the natural and social fields.
- Tài liệuHow to effortlessly write a high quality scientific paper in the field of computational engineering and sciences(Trường Đại học Nguyễn Tất Thành (Tạp Chi Khoa học công nghệ NTT), 2021-10-30) Nguyen, Phu Vinh; Stephane Bordasb; Alban de VaucorbeilcThis paper outlines a scientific writing process that helps us to have a nearly complete paper when the last analysis task has been finished. The key ideas of this process are: (1) writing should start early in the research project, (2) research and writing are carried out simultaneously, (3) best tools for writing should be used. The process seems working well as it has helped us writing thousands of pages without feeling a pain. We hope it works for you too. Due to our personal preferences, the discussion is confined to LATEX based typesetting where we present guidelines to prepare high-quality images, tables, algorithms and source codes using LATEX. We also discuss writing guidelines such as paper structure, major components of a paper from title, abstract, introduction, results to references, and some common mistakes
- Tài liệuHyperpolarization-activated cyclic nucleotide-gated gene signatures and poor clinical outcome of cancer patient(NTT Institute of Hi-Technology, Nguyen Tat Thanh University, Ho Chi Minh City, Vietnam, 2017-07-22) Phan, Nhut Nam; Huynh, Thanh Tung; Yen-Chang LinMeta-analysis of public microarray data from Oncomine and NextBio Research databases to discover the mRNA expression level of HCN1-4 in cancers. Survival analysis was also used to investigate the correlation between overexpression of HCN gene family with overall survival rate of cancer patients using Kaplan-Meier Plotter database and PROGgene V2 database. Results: HCN genes (HCN1-4) over-expression and under-expression in multiples types of cancers such as CNS and brain cancer, breast cancer, colorectal cancer, melanoma, and lymphoma were found. HCN1 was significantly correlated with low overall survival of breast cancer [hazard ratio (HR) =7.42, P=0.0019] and colorectal cancer (HR =1.66, P=0.0071) patients. The lower survival rates of lung cancer (HR =2.5, P= 0.0107), kidney cancer (HR =1.1, P=0.004) and gastric cancer (HR =1.33, P=0.0037) patients were significantly correlated with the expression of HCN2. HCN3 was significantly correlated to lower survival rates of breast cancer (HR =1.65, P=0.0016), and kidney cancer (HR =1.17, P=0.0049). HCN4 was highly correlated with the lower survival rates of breast cancer of gastric cancer (HR =1.25, P=0.022), lung cancer (HR =5.37,
- Tài liệuImpacts of Online Education on Teaching Quality and Satisfaction of Medical Students During Covid-19:(Trường Đại học Nguyễn Tất Thành, 2022-03) Nguyen, Tran Ngoc Phi; Nguyen, Thi Thuy Phuong; Pham, Nguyen Trong Nhan; Ta, Duc Luan; To, Dinh Khuong; Nguyen, Huu VinhThis study was conducted with the aim of surveying and evaluating the views of students of the Faculty of Medicine at Nguyen Tat Thanh University on the influence of online learning on learning quality. Using data from survey questionnaires, the results show that the online learning has impacted different learning aspects of students such as: time management, online satisfaction, training problems. At the same time, the study also recognizes the contributions of students in improving the quality of online teaching of Nguyen Tat Thanh University.