Svetlana Čičević

Exploring college students' generational differences in Facebook usage

In recent years the usage of social networks among students has become the subject of numerous studies. In this study we were interested in differences in patterns of online behaviour and the use of Facebook (FB) among the second and third generation of students. The results showed that 66% of the second year students had a FB account, while in the third generation all of the respondents had a FB account. One third of the second year students avoid any involvement in FB. Lack of interest was one of the main reasons the respondents indicated for not being engaged in FB, as well as their unwillingness to put personal information online. Currently, most of them are satisfied using FB, and do not plan to turn off their profile. The newer generations of students use FB mainly for overcoming boredom. Based on the results of the study, it can be concluded that the time spent online increases, as well as the number of FB users, and also the number of virtual friends increases in order to exchange information. We concluded that the number of users of Facebook increases among older students in comparison to younger one.We found that increasing the number of friends on Facebook is more pronounced among older students.Membership in groups is more popular within older students.Most students do not consider that they are addicted to Facebook.

The importance of spatial orientation and knowledge of traffic signs for children's traffic safety

Pre-school children, as well as children from lower grades in primary school, who although rarely, completely independently participate in traffic, represent a vulnerable population from the standpoint of traffic safety. The greatest number of children were injured or killed in road traffic crashes on their way from home to kindergarten or school. Mostly due to lack of experience, childrens behavior is confusing and often reckless and hasty. Safe behavior in the traffic environment demands certain cognitive skills. Unlike adults, children have less than fully developed peripheral vision. Also, changes occur in color perception, i.e. discrimination. All this leads to the conclusion that the stage of physical and mental development of the child is very important for safe participation in traffic. So, to estimate if they are sufficiently equipped to participate safely in traffic, a sensitive test for young children that may be suitable for their level of cognitive development is required. Accordingly, road safety education should be arranged in such a way that considers the childs level of development, as has been shown to be more effective when started at younger ages. Play is the most natural and easiest way of learning because it is the lens through which children experience their world, and the world of others. Having this in mind, if we want to measure the abilities of a child, and their preparedness for safety participation in traffic, unavoidable is to use non-verbal tests. The purpose of this study is to explore primary schoolers spatial, and abilities of color perception and memorization, as well as their performances in interpreting the meaning of traffic signs. In addition, neighborhood environmental correlates (rural-urban) and possible individual differences influences on the relationship among these abilities was examined. Knowledge about these factors affecting childrens safety can be applied to improve relevant intervention measures for promoting safe participation of young children in traffic. It may constitute the basis for effective classroom work which implies the creation of individualized educational plans and programs, through which road safety skills could be acquired and adopted through play.

MERENJE EMISIJE BUKE MOTORNIH VOZILA NA TERITORIJI GRADA KRAGUJEVCA

Buka u životnoj sredini definise se kao buka koju stvaraju svi izvori, iskljucujuci buku koja nastaje na samom radnom mestu u industrijskim pogonima. Buka u životnoj sredini je oduvek predstavljala veoma važan problem sa kojim se covek suocavao i težio da njom upravlja i da je kontrolise. Danas je problem mnogo izraženiji. Ogroman broj motornih vozila se krece u urbanim gradskim sredinama, odnosno gradovima, kao i autoputevima. Teski kamioni sa dizel motorima i velikom bukom krstare putevima sirom države. Avioni i vozovi takođe daju svoj doprinos povecanju ukupne buke.

Triangular Proportional Scheme and Concept of the Two Serbian Medieval Churches

Serbian medieval architectural heritage is notable for its sacred architecture including numerous Christian Orthodox churches built at the territory of former Raska state during the period from the 12th to the 14th centuries. Built in the so-called Raska architectural style, characterized by overlapping features of Romanesque and Byzantine traditions, two monuments—the church of the Mother of God in Studenica monastery complex and the church of Holy Dormition in Žica monastery complex, are exquisite sacred structures and cultural monuments of exceptional importance. They are also remarkable due to geometric-proportional regularities of their design. This paper highlights the importance of geometric concept in relation to proportional analysis of these two structures. Here presented study is conducted by two means: first one—by investigating geometric scheme with equilateral triangles, incorporated into the layout and cross section patterns of each church structure; the second one—by classical proportioning that includes proportional roots, golden section and numeric ratios.

Challenges and Promises of Mobile Devices Usage for Spatial Visualization Skills Assessment in Technical Drawing for Engineering Course

Modern education systems and curricula attend are largely based on the application of new technologies. The traditional way of working on subjects from group based on engineering drawing using computers includes adequate theoretical training and practical exercises which are solved by drawing and constructing a pen and aids on paper. The modern method has brought numerous news. The tasks that were solved with a pen on paper, in this case, are solved by using computers and appropriate software tools. There has been a wide acceptance of CAD software packages. Spatial visualization skills is the ability to which it is the application of new technologies and specialized software had both a positive and a negative impact. Due to the great importance of this skill in all areas of engineering, it is necessary to work on its improvement. This present study was designed to determine challenges and promises of mobile devices usage for spatial visualization skills and achievement in Technical Drawing for Engineering course for students at University of Belgrade.

A model for the comparison of business units

Purpose The purpose of this paper is to propose a methodology for the comparison of business units and to illustrate its implementation. Job stress is introduced as a mediator variable. A postal company is taken as a case study and its three business units are compared. The units (i.e. employees who have direct contact with customers) analyzed are postal clerks, couriers and call center operators. Design/methodology/approach Quantitative data were collected using two questionnaires: the first to assess the state of predefined organizational parameters, and the second to measure the stress levels of employees. The χ2 test of independence (χ2 test) and Fisher’s exact test are used to calculate correlation. Work stress score and stress distribution index, which are proposed in this study, are used to quantify the levels of stress, the state of organizational parameters and possible improvement points, as well as to compare the business units. Findings According to the results, the most demanding job is that of couriers, followed by postal clerks and call center operators. Originality/value The proposed model could be used to assess and improve businesses and to reduce the stress levels of employees. Further, a model for the comparison of business units might be a useful tool for managers in defining working hours, breaks, length of holiday periods and even in creating a wage structure.

System Usability Scale Implementation for Interfaces on Mobile Touch Screen Devices Assessment

The indisputable fact is that touch screen mobile devices flooded the marketplace and that they have become an essential element in the enormous number of fields and applications. But a huge presence, as well as daily use, does not necessarily unambiguously reflect their optimal usability. Therefore, it is essential to adopt appropriate research methodologies that can evaluate the usability of mobile device interfaces. The main focus of the study was to examine a practical tool for usability assessment in a mobile work context which has to be simple and above all, proved to give a single score as its outcome. To achieve this goal System Usability Scale (SUS) was applied to test the Tablet PC usability. This study contributed with the proposal of a framework for usability testing which could help, both practitioners and researchers to make decisions how to improve the usability of interfaces on touch screen mobile devices.

Gender differences in the relations between vocal and graphomotoric characteristics in stress condition

The aim of this investigation was to explore exam stress influences on gender differences in the relations between vocal and graphomotoric characteristics. One hundred students of medicine (equal number of males and females) participated in this study. The subjects had to pronounce aloud and simultaneously to write the results of subtracting serial seven (SSS) arithmetic task, beginning from thousand, for five minutes, just before the exam. Voice characteristics (loudness, duration of pronunciation and pauses) and the magnitude and distance of the written numbers, written length of paper and number of rows during graphomotoric part of task were analyzed. The distance among written results and among rows positively correlated with pauses between utterances of correct numbers, whereas distance among written results negatively correlated with the quotient between utterances and pauses in women. Also, the distance from left margin of the written paper negatively correlated, whereas broad and length of written part of paper positively correlated with average and maximal intensity of voice in women. The distance among written results negatively correlated with maximal intensity of voice in men. The exam stress induces gender dependent correlations of written and oral speech during SSS task solving.

Perception and attitudes towards digital billboards

Given that digital billboards are a relatively new phenomenon in Belgrade, we aimed to examine how its citizens really perceive them, as well as to reveal their attitudes towards digital billboards. The results showed that the length of exposure to advertising content has a crucial influence on their perception.

The risks associated with using a mobile phone by young drivers

AbstractA substantial body of research has shown that mobile phone usage could lead to the impairment of driving performance and increase the likelihood of driving accidents. The use of mobile phone while driving is a major problem for inexperienced drivers. The reason for this lies in the fact that they have not developed abilities to process different types of information simultaneously. Mobile phone use may result in reduced attention allocation to the various tasks during driving. The research of young drivers’ habits related to mobile phone usage while driving is presented in this paper. A series of questions were administered, including along with demographic measures, self-reported number of traffic accidents and several kinds of driving behaviour such as alcohol consumption. The results have shown that 68% of young drivers used mobile phone while driving. Additionally, a relationship was found between frequency of mobile phones usage and the number of traffic accidents, consequences of traffic acc...