Ljubica Kazi's research while affiliated with University of Novi Sad and other places

Air pollution is one of the most challenging and complex problems of our time. This research presents the prediction of air pollutant values based on using an R program with linear regression. The research sample consists of obtained values of air pollutants such as sulphur dioxide (SO2), particulate matter (PM10, PM2.5), carbon monoxide (CO), nitrite oxides (NO, NO2, and NOX), atmospheric data pressure (p), temperature (T), and relative humidity (rh). The research data were collected from the city of Belgrade air quality monitoring reports, published by the Environmental Protection Agency of the Republic of Serbia. The report data were transformed into a form suitable for processing by the R program and used to derive prediction functions based on linear regression upon pairs of air pollutants. In this paper, we describe the R program that was created to enable the correlation of air pollutants with linear regression, which results in functions that are used for the prediction of pollutant values. The correlation of pollutants is presented graphically with diagrams created within the R GUI environment. The predicted data were categorized according to air pollution standard ranges. It has been shown that the derived functions from linear regression enable predictions that are well correlated with the data obtained by automatic acquisition from air quality monitoring stations. The R program was created by using R language statements without any additional packages, and, therefore, it is suitable for multiple uses in a diversity of application domains with minor adjustments to appropriate data sets.

This paper analyzes the concept of clean code, in context of software structural quality. It presents a review of quality attributes of a clean code, related to ISO 25010 standard for quality of a software product and attributes of structural aspect of software quality. It also provides an overview of clean code effects experiments and clean code attributes measurements methods. This paper also addresses methods, practices and effects of refactoring existing code to clean code.

This paper describes the concept of interoperability of distributed business web applications, as well as the division of application into layers, and the explanation of individual layers. This paper presents an example of the problems of data exchange between retail and wholesale. An example is implemented using software tools such as Microsoft SQL Server Management Studio, software development environment Microsoft Visual Studio 2017 and Notepad++.

The social network Facebook is used every day, and it has a big impact on people. The greatest use is among young people and this is shown in this paper. In addition, the time spent at the daily level is displayed, as well as the way of communication, whether more important is written or verbal communication, as well as the importance of real friends versus virtual friends. The population over which the research was carried out in most cases is young and on the territory of the Middle Banat.