Performanse kooperativnih bežičnih telekomunikacionih sistema i mogućnosti povećanja kapaciteta kanala u prisustvu fedinga i međukanalne interferencije

In order to improve the performance of the wireless signal transmission system in the presence of various types of interference, new methods of combining diversion techniques in the relay and on the receiving side have been proposed. When using diversi, the combining technique has shown a significant improvement in the performance of wireless relay signal transmission, and thus a lower probability of system failure. Increasing the capacity of wireless telecommunications systems is feasible in terms of fixed bandwidth and specified modulation format by using the cooperative concept to increase the signal strength to noise and interference ratio. By using mobile stations as a relay, performance improvement can be achieved in M2M communication, which can be rationally used to increase channel information capacity and transmission reliability. A more detailed analysis has been conducted and can answer questions about quantitative measures of improvement in the conditions of fading and inter-channel interference. The cases of relay transmission are discussed, as well as the possibility of applying a diversion technique to improve performance in conditions of simultaneous reception of a signal through a direct connection and through a relay. For the above cases, standard performance measures will be determined using statistical telecommunications theory

Performanse kooperativnih bežičnih telekomunikacionih sistema i mogućnosti povećanja kapaciteta kanala u prisustvu fedinga i međukanalne interferencije

In order to improve the performance of the wireless signal transmission system in the presence of various types of interference, new methods of combining diversion techniques in the relay and on the receiving side have been proposed. When using diversi, the combining technique has shown a significant improvement in the performance of wireless relay signal transmission, and thus a lower probability of system failure. Increasing the capacity of wireless telecommunications systems is feasible in terms of fixed bandwidth and specified modulation format by using the cooperative concept to increase the signal strength to noise and interference ratio. By using mobile stations as a relay, performance improvement can be achieved in M2M communication, which can be rationally used to increase channel information capacity and transmission reliability. A more detailed analysis has been conducted and can answer questions about quantitative measures of improvement in the conditions of fading and inter-channel interference. The cases of relay transmission are discussed, as well as the possibility of applying a diversion technique to improve performance in conditions of simultaneous reception of a signal through a direct connection and through a relay. For the above cases, standard performance measures will be determined using statistical telecommunications theory

Application of SysML on a simplified model of an air surveillance radar / Применение языка SysML на упрощенной модели радиолокационного наблюдения / Primena SysML na pojednostavljen model osmatračkog radara

Systems Modeling Language (SysML) is a Unified Modeling Language (UML) profile intended for application in systems engineering. This text is inspired by lack of literature on SysML in Serbian language. Its goal is to introduce this interesting modeling language to the engineering and academic community, with a special emphasis on the differences from UML. An overview is given, using an original example – a simplified model of an air surveillance radar. A short analysis of practical aspects of SysML is made – its scope of acceptance, the prospects of its further application, etc. We concluded that SysML is a useful, accepted and promising modeling language. / Systems Modeling Language (SysML) представляет собой профиль Unified Modeling Language (UML), предназначенный для применения в системной инженерии. Недостаток литературы о SysML на сербском языке подтолкнул автора данной статьи к ее написанию, с целью представления этого интересного языка моделирования инженерному и академическому сообществу, при этом подчеркиваются различия между языками SysML и UML. Описание профиля приведено на основании конкретного примера – упрощенной модели радиолокационного наблюдения. Проведен краткий анализ практических аспектов SysML о его внедрении, перспективах дальнейшего применения и пр. В заключении приведены выводы о полезности применения языка SysML, его употребляемости и благоприятных перспективах в связи с его внедрением. / Systems Modeling Language (SysML) jeste profil Unified Modeling Language (UML) namenjen za upotrebu u sistemskom inženjerstvu. Ovaj tekst inspirisan je manjkom literature o SysML-u na srpskom jeziku, a ima za cilj upoznavanje inženjerske i akademske zajednice sa ovim interesantním jezikom za modelovanje, pri čemu su posebno naglašene razlike u odnosu na UML. Opis je dat kroz konkretan originalan primer - pojednostavljen model osmatračkog radara. Ukratko su analizirani praktični aspekti SysML-a - koliko je prihvaćen, kakva je perspektiva njegove dalje primene, itd. Može se zaključiti da je SysML koristan, prihvaćen i perspektivan jezik za modelovanje

Biodiesel production from corn oil: A review

This paper deals with biodiesel production from corn oil as a feedstock via the transesterification and esterification reactions. To date, corn oil has not been considered a viable biodiesel feedstock because of its high edible value and relatively high price, but some industrial corn processing co-products, such as corn germ and dried distillers grains with solubles (DDGS), have potential for this application after the extraction of corn distillers oil (CDO). Here, after brief discussion of the issues related to corn botany, cultivation, and use, as well as the corn germ and oil composition, properties and use, the methods of corn processing for germ and DDGS recovery are presented. In addition, the mechanical and solvent extraction techniques for oil recovery from whole ground corn kernels, germs, and DDGS are considered. Furthermore, biodiesel production from corn oil, waste frying corn oil, and CDO is critically analyzed. It is expected that further investigation will be directed toward developing simpler, more effective and energy-saving technologies for biodiesel production from corn oil-based feedstocks, especially from CDO. The integration of biodiesel production directly into corn-based ethanol production will advance the overall economy of industrial plants. Furthermore, the fuel properties, performances and exhaust gas emissions of corn-based biodiesel and its blends with diesel fuel are discussed, taking into account the biodiesel quality standards. Finally, issues related to the environmental and socio-economic impacts of corn-based biodiesel production and use are also tackled