<p>The paper examines the current state and the possibilities of using contemporary approaches and tools in HelpDesk systems development with the aim to examine its disadvantages. Disadvantages are accurately analyzed and the paper gives clear guidance how to eliminate them. It has been noticed that current design and development approaches have their own advantages and disadvantages. The application of the unified approach that combines the best individual characteristics of the existing approaches enables development of an automated HelpDesk system that is capable of expanding its own expertise. By combining unified aspect approach with the zero tolerance model driven approach, a new innovative approach to the development of a wide range of expert systems is obtained. This innovative approach is characterized by the highest possible degree of modularity. The application of the aforementioned approaches has also enabled expansion and improvement of the existing expert systems used for servicing numerous companies operating in various fields of business.</p>

<p>This article discusses the properties of concrete composite materials based on their contexture. Systematic and interactive approaches are required in order to achieve optimal material properties in the preparation of composite materials. In order to predict the physical and mechanical properties of each component of the composite material but also as a whole, its optimization, not only the mechanical but also the material properties under different working conditions, requires a combination of different methods and technologies. The advantage of each composite is its specific properties that cannot be achieved by any component of the composite material alone. The strength of the materials based on polymer concrete mixtures can be compared to the strength properties of metals. On the other hand, this material has elastic properties which give the material a high degree of flexibility. When compared to conventional materials, the value of polymer composites is assessed not only in terms of excellent mechanical properties but also in terms of their low weight and cost. The aim of the paper is to describe the advantages and disadvantages of composites based on polymer concrete mixtures.</p>

<p>The substantial advantage of 3D printing is the ability to fabricate complex shapes objects from liquid molecules or powder grains which joins or solidifies using computer design files (CAD) to produce a three-dimensional object with material being added together layer by layer. This process is considered as an industrial technology. The most-commonly used 3D printing procedure is a material extrusion technique called fused deposition modelling. The producers of 3D printers have already developed prototypes for education purposes. The importance of the incorporation this printing method in schools is the fact. The learning experience for digital media is becoming a priority in school education. The practical application of this technique can be incorporated into a wide variety of school subjects to simplify the sophisticated theoretical concepts. 3D printing is the example of cooperation within material science and mathematics but this platform is very often not supported by the high school curriculum, but latest trends propose different approaches and make education close to the science achievements and contemporary life. Building lessons plans and project could help students to learn more contemporary achievement in this field. It is new trend to support enthusiastic teachers who want to implement this method of additive manufacturing in education. This paper provides an overview of 3D printing methods and highlights the possibility of their implementation in educational techniques.</p>

<p>U radu će biti izvršena komparativna analiza vodećih ERP sistema otvorenog koda. Na početku će biti opisan pojam ERP sistema otvorenog koda, prednosti i nedostaci u odnosu na vlasničke ERP sisteme sa aspekta fleksibilnosti, cene proizvoda, troškova održavanja i korisničke podrške. Biće izvršena analiza faktora koji imaju uticaj na opredeljenje za ERP sisteme otvorenog koda i komparacija četiri rešenja - Compiere, ADempiere, Odoo i Openbravo. Za svaki od njih biće prikazane funkcionalnosti, korišćene tehnologije, prednosti i nedostaci upotrebe. Nakonprikaza svakog od rešenja biće izvršeno njihovo poređenje po različitim kriterijumima sa ciljem olakšavanja procesa odlučivanja i odabira optimalnog ERP sistema. Neki od kriterijuma poređenja biće funkcionalnosti, korišćena tehnologija, cena proizvoda, troškovi održavanja, korisnička podrška i kastomizacija. Na kraju rada biće iznet zaključak kao sumarni rezultat istraživanja.</p>