Data science

p 01-01-1970   Download

This article presents an overview of Stream Algebra, a research field that has emerged after the birth of Relational Algebra used in Database Management Systems (DBMS). When Stream Data appeared and needed to be processed in real-time, the role of Stream Algebra became evident. Since the rise of Big Data, this field has received attention in recent years, the role of Stream Algebra has been further demonstrated.

7p visarada 28-04-2025 1 1   Download

The main objective of this study is to predict accurately the loaddeflection of composite concrete bridges using two popular machine learning (ML) models namely Random Tree (RT) and Artificial Neural Network (ANN). Data from 83 track loading tests conducted on various bridges in Vietnam were collected and analyzed.

9p viengfa 28-10-2024 3 2   Download

In recent years, landslides are taking place very seriously, and tend to increase in both scope and scale, threatening people's lives and properties. Therefore, timely detection of landslide areas is extremely important to minimize damage. In this paper, an improved algorithm for partitioning data with reliability problems using multiple fuzzifiers named as TSSFC is introduced.

9p viengfa 28-10-2024 5 2   Download

This paper develops an Artificial Neural Network (ANN) model based on 96 experimental data to forecast the dynamic modulus of asphalt concrete mixtures. This study applied the repeated KFold cross-validation technique with 10 folds on the training data set to make the simulation results more reliable and find a model with more general predictive power.

9p viengfa 28-10-2024 5 2   Download

At present, artificial intelligence (Al) is one of the most rapidly developing fields in science and technology. In the modern context, Al technologies have become a highly researched area globally, leading to breakthrough technologies that enhance efficiency and effectiveness across various sectors, including environmental security.

15p viuzumaki 28-03-2025 4 1   Download

Artificial intelligence is gradually emerging as a method for optimizing various tasks, offering cost-saving and highly efficient solutions. Nowadays, Al is used as a general term for diverse tasks performed by computers. Fields like machine learning, deep learning, and data science, among others within this scope, are considered part of Al as long as they exhibit the characteristics of artificial intelligence.

12p viuzumaki 28-03-2025 5 1   Download

This research presents an exploratory investigation of sales agents of international insurance firms in Hanoi, aiming to understand the connection between the Uncertainty Avoidance (UA), as discussed by Hofstede (2024), and the digital divide identified by Jan van Dijk (2020). The survey using Google Form was administered to 246 Vietnamese sales agents to collect data for SPSS analysis. The AMOS path diagram was then employed to test the hypotheses based on the conceptual model. The findings indicate that Uncertainty Avoidance negatively impacts the digital divide.

12p tuongmotranh 18-03-2025 15 1   Download

The study attempts to explore economic, financial, and institutional developmental factors that contribute to the growth of the size of corporate bond markets by using the data set from ten Asian economies (China; Hong Kong, Indonesia; Japan; Korea; Malaysia; the Philippines; Singapore; Thailand; and Vietnam). The empirical findings by generalized least squares model show that the level of economic development as shown by GDP per capita is one of the most important factors in the development of corporate bond markets.

9p tuongmotranh 18-03-2025 24 1   Download

The basic characteristics of sensor were investigated, and these experimental data were used for a machine learning. The results of the model validation proved to be a reliable way between the experiment and prediction values.

10p viengfa 28-10-2024 3 2   Download

This study investigated the role of perennial crop systems in enhancing sustainable livelihoods among rural households in Dak Lak province, Vietnam, with a particular focus on coffee and pepper crops. To gather data for this study, structured interviews were conducted with 86 households (90 farms) through a multi-stage sampling approach from January to May 2019.

12p vibecca 01-10-2024 4 2   Download

This study measured production efficiency considering environmental factors (environmental efficiency) to assess the sustainability of pig farms in the district. This study used the data envelopment analysis (DEA) model with undesirable output (COD emissions) to measure environmental efficiency in pig production.

12p vibecca 01-10-2024 5 2   Download

This study aimed to analyze the current situation of vocational training for farmers and farmers’ needs for vocational training in the next years in extremely isolated communities. The primary data were collected from 480 farmers in 16 communes.

13p vibecca 01-10-2024 6 1   Download

This study explored the factors affecting members’ satisfaction with the quality of support activities of cooperatives using data collected from 301 members of horticultural cooperatives in Son La province. The study applied the SEVERQUAL concept and cooperative principles to develop the research model.

14p vibecca 01-10-2024 3 1   Download

This study, therefore, investigated the determinants of the labor productivity of garment firms in Nam Dinh province. The data used for this study were extracted from the Enterprise Survey Dataset in 2021, and descriptive statistics, comparative analysis, and the Cobb-Douglas function in logarithm form were the major methods employed for the study.

9p vibecca 01-10-2024 6 2   Download

This study evaluated the impact of pollution sources on the Ma River Basin in Son La Province, Vietnam, using data from local reports, statistical yearbooks, and scholarly literature. The study recommended implementing centralized wastewater treatment systems in priority areas, promoting sustainable land management practices, and supporting environmentally friendly agricultural and livestock farming methods.

14p tuetuebinhan000 23-01-2025 3 2   Download

SPSS là tên viết tắt của cụm từ Statistical Package for the Social Sciences. Đây là một phần mềm được sử dụng rộng dãi nhất để phân tích thống kê trong nghiên cứu khoa học tự nhiên và khoa học xã hội nói chung. Phiên bản đầu tiên được phát hành năm 1968 do Công ty liên hợp SPSS- Chicago Mỹ sản xuất. Đến tháng 7 năm 2007 đã có phiên bản thứ 16 (SPSS 16.0) Môi trường làm việc của SPSS gồm hai phần: phần soạn thảo dữ liệu đầu vào (SPSS Data Editor) và phần kết quả đầu ra (Output – SPSS Viewer)....

27p beaver123 20-07-2013 224 39   Download

Refers to a natural process converting atmospheric nitrogen to ammonium to yield usable nitrogen source. • Only a few prokaryotic species can "fix" nitrogen. • Nitrogenase complex dinitrogenase dinitrogenase reductase

114p zingzing09 21-10-2012 94 8   Download

Alter the appearance, aroma, texture and flavor of a product. Deliver nutrients more effectively to the body or to make a food that is difficult to digest a bit easier to swallow. Accelerate the good fermentation time, giving a finished product in weeks instead of months.

36p zingzing09 21-10-2012 106 19   Download

Many enzymes are added to grain feeds in order to convert some of the indigestible carbohydrates acting only as dietary fiber to accessible energy sources. amylases and glycases

24p zingzing09 21-10-2012 88 10   Download