Wie nehmen Schüler die Körpersprache des Lehrers wahr

Der Begriff der Körpersprache bezieht sich auf die körperlichen Ausdrucksbewegungen, die in einer Sprachgemeinschaft bestimmte festgelegte Bedeutungen haben und eine wichtige Rolle im alltäglichen Sozialverhalten spielen. Mehr als zwei Drittel der menschlichen Kommunikation laufen nichtverbal ab. Die Körpersprache lässt sich in vier Grundkategorien einteilen: Mimik, Gestik, Kinesik und Proxemik. Im Rahmen dieser Diplomarbeit wurde eine Untersuchung durchgeführt, die auf die Bedeutung der Körpersprache des Lehrers im Fremdsprachenunterricht hinweisen soll. Mit Hilfe einer Online-Umfrage wurden drei Hypothesen überprüft, die Folgendes gezeigt haben: 1) Schüler sind schon im Grundschulalter in der Lage, die Körpersprache wahrzunehmen und richtig zu interpretieren; 2) Schülerinnen verstehen die Körpersprache besser als Schüler; 3) Unabhängig von ihrem Alter oder Geschlecht haben die Schüler Schwierigkeiten in der Interpretation, wenn der Lehrer widersprüchliche Signale sendet

Reduction of torque ripple in DTC induction motor drive with discrete voltage vectors

This paper presents а practical implementation of direct torque control (DTC) of an induction machine on MSK2812 DSP platform, and the analysis of possibilities for reduction of torque ripple. Basic theoretical background relating the DTC was primarily set and the obtained experimental results have been given. It is shown that the torque ripple can be reduced by adjusting the intensity of voltage vectors and by modification of hysteresis comparator, while the simplicity of the basic DTC algorithm has been maintained. [Projekat Ministarstva nauke Republike Srbije, br. TR33016

Agent Based Onboard Firefighting System

This paper presents a model of agent-based architecture for fighting fires on ships. The introduction of agent technology in firefighting decision-making is a step towards safe autonomous vessels. The human factor can be excluded through the introduction of agent-based technology for the detection and extinguishing of fires onboard ships. The aim is to reduce the number of injuries and deaths, and minimize loss of ships and cargo. Another advantage of agent-based technology is its easy interoperability with other automated onboard systems. The presented model was implemented on a prototype in a simulation environment. The results of the experiment conducted on the implemented prototype are also presented

A Survey of Agent-Based Modelling and Simulation Tools for Educational Purpose

Simulation is an experimentation with the imitation or model of the observed system, and observation of its behaviour over time, with the purpose of better understanding and/or improving the system. It is often used in situations where research cannot include the real system because of its inaccessibility, dangerous or unacceptable involvement, the fact that the system is designed but not built yet, in situations where the system is abstract or simply does not exist. Elements of these systems can be implemented as software entities which can percept their environment and autonomously react to the stimulation, i.e. intelligent agents. These tools, which allow the research of complex natural, social and technical phenomena and systems, are called agent-based modelling and simulation tools. This paper presents a review of some of these modern computer tools that can be successfully implemented in the teaching process

Protection against electric shock in electrical engineering didactic laboratories

This study was supported by the Ministry of Education, Science and Technological Development of the Republic of Serbia, and these results are parts of the Grant No.451-03-68/2022-14/200132 with University of Kragujevac - Faculty of Technical Sciences Čačak.In order to rise safety level of the users in real laboratory environment related to the courses of electrical engineering the description and application examples of cover for laboratory screw terminals for use in research laboratories and experimental electrical systems and equipment is depicted in this paper. The main advantage of the described covers is the protection of laboratory personnel and students against direct contact to metal parts of terminal, which are under high voltage potentials. The paper points out the necessity for protection measures and contains examples of use of different covers for electrical machines, power converters, electric meters and other laboratory equipment.Publishe

Application of standard and modified Eh-Star test method for induction motor stray load losses and efficiency measurement

The aim of this paper is to present the application of one simple and accurate method for the measurement of stray load losses (additional load losses) in induction machines. That is the Eh-Star method given in the IEC 60034-2-1 standard. In this paper the theoretical background of the method and the measurement procedure have been explained. All measurements have been performed using modern measurement systems based on a personal computer, data acquisition cards and LabVIEW software. According to the measured results for the stray load losses, the efficiency of the induction motor has been calculated. The efficiency obtained has been compared with the IEC standard efficiency classes, in order to determine the efficiency class of the tested motor. Additionally, measurements have been performed using the modified Eh-Star method. The results obtained have been compared with those obtained using the Eh-Star method. The advantages and disadvantages of both methods have been analyzed in this paper

Field reversal DC machine braking with DCM drive

This study was supported by the Ministry of Education, Science and Technological Development of the Republic of Serbia, and these results are parts of the Grant No. 451-03-68/2022-14/200132 with University of Kragujevac Faculty of Technical Sciences Čačak.This paper gives a detailed description of implementation of braking by field reversal at laboratory setup of DC machine with modern Siemens DCM drive. The main focus of the paper is implementation of braking procedure of the DC machine using field reversal through didactic approach suited to students of electrical engineering within the course of the electric drives at Faculty of Technical Sciences Čačak. The laboratory test bench allows students to upgrade parts of the setup and test different operation regimes of DC and AC machines, as well as gaining experience of tuning and optimization of the overall motor-load system.Publishe

Razvoj laboratorijskog sistema za merenje karakteristika fotonaponskotermičkog panela

The emissions of harmful gases into the atmosphere, air pollution and global warming can be greatly reduced by increasing the use of renewable energy sources such as solar energy to heat domestic hot water, space heating and generating electricity. This paper describes the systems of combined (hybrid) PV/T panels that can simultaneously generate both heat and electricity, as well as the characteristics of the PV/T panel. A prototype of the laboratory setting for the examination of these systems along with the used components is also shown. The temperature, fluid flow rate values, obtained heat and electric gain are also presented. Deficiencies and proposed changes in the laboratory setup and used equipment were laid out, in order to improve the accuracy of the measurements.Publishe

Application of nanofat for treatment of traumatic faecal incontinence after sphincteroplasty – A pilot study

Aim: The aim of this study was to investigate whether the application of nanofat contain-ing stem cells improves continence in women who had previously undergone anal sphinc-teroplasty with unsatisfactory long-term outcomes.Method: This prospective pilot study included nine women with various degrees of anal incontinence who had previously undergone anal sphincteroplasty due to obstetric trauma. In all patients, the Wexner Incontinence Score (WS) and Faecal Incontinence Quality of Life Score (FIQLS), as well as anal manometry and endoanal ultrasound meas-urements, were performed before the procedure and during follow-up. In all patients, liposuction was performed and 50 ml of raw lipoaspirate was obtained and processed using a NanoFat Kit device. Approximately 20 ml of the mechanically emulsified and fil-trated fat was obtained and the anal sphincter complex was infiltrated with it. Patient fol-low-up was conducted in person or via telephone 6 and 12 months after the procedure.Results: The squeeze pressure was significantly increased 6 months after the proce-dure (p= 0.01). The external anal sphincter measured at the 12 o'clock position was sig-nificantly thicker (p= 0.04). A significant decrease in the WS was observed both 6 and 12 months after the procedure compared with baseline values (p< 0.05 for both).Conclusion: This study is the first to show that the application of nanofat as an inject-able product improves continence in patients with unsatisfactory results after sphinc-teroplasty, suggesting it to be a promising and effective therapeutic tool. The procedure is safe and can be easily performed as an ambulatory procedure

Long non-coding RNA H19 expression in rectal cancer and therapy response

Background & objectives: Long non coding RNA, H19 is an imprinted, maternally expressed gene, usually deregulated in diferent cancer types, including rectal cancer. This study aimed to investigate H19 role as a potential biomarker to predict therapy response in rectal cancer patients. Methods: The study included 14 patients diagnosed with rectal cancer, treated with neoadjuvant chemoradio therapy (nCRT). RNA was isolated by TRIzol reagent from samples of rectal cancer tissue before and after nCRT. Relative expression of H19 was normal- ized to housekeeping GAPDH gene, and expression was analysed by quantitative real-time PCR. Relative expression of H19 was calculated by 2-ΔCt method. Results: Relative expression of H19 was significantly increased in rectal cancer tissue after nCRT (0.244±0.408) compared to the tissue before nCRT (0.043±0.055), p=0.004, Wilcoxon test. According to tumour regression grade (TRG), 85.71% (12/14) of patients did not respond, while 14.28% (2/14) responded to pre- operative CRT. Responders (TRG1, TRG2) and non-responders (TRG3, TRG4) did not differ in H19 expression in tumour tissue before (p=0.659, Mann-Whitney U test) as well as after nCRT (p=0.999, Mann-Whitney U test). Receiver operating curve analy- sis indicates that H19 expression in colorectal tissue before nCRT can not be used as a biomarker for distinguishing responders from non-responders (AUC=0.625, 95%CI=0.257-0.992, p=0.583). Conclusion: Our study suggests H19 upregulation upon neoadju- vant chemoradiotherapy in rectal cancer. The potential predictive value of H19 as a biomarker of therapy response should be studied in a larger group of patients