Information systems in small and medium-sized enterprises of the textile and clothing industry

Market uncertainty and financial instability in the era of global competition force companies to work faster and increase productivity and business efficiency with continuous cost reduction and qualitative efficiency, which serves as a basis for strengthening the competitiveness and sustainable development of all, including SMEs -small and medium-sized enterprises of the textile and clothing industry. Various innovative contents and adequate technological solutions, as well as reengineering of business/production processes, with massive and adequate implementation of technical-technological innovations based on information and communication technologies -ICT and flexible automation, i.e. on the direct and efficient implementation sector defined information systems, also represent possible elements of functional competitiveness and sustainable development. Otherwise, changes in the environment and ways of doing business of companies require a better understanding and integration of data, as well as their more efficient exploitation in the functioning and development of the company, which imposes the need for permanent generation, adaptation and development of quality and efficient information systems. As a result of such requirements, the responses of industrial production through the implementation of technical-technological innovations are inevitable, whereby quality and efficient ICT infrastructure, coherence of innovative technologies and flexible production, as well as compatibility and complementarity of production and business information systems, are necessary elements and indicators of efficiency and quality. The implementation, efficient exploitation, as well as the development of various business and production information systems, obviously has its benefits, presented through more efficient, better quality and faster operations, but also disadvantages, because it is obviously conditioned by the stochastic laws of the global market, the variable human factor or the lack of high-quality, highly educated professionals staff, requirements for high initial investments, but also the specifics of the textile/clothing industry and SMEs, as well as the incompatibility of the implemented production and business systems

Ispitivanja brzih vlakova u podzvučnom zračnom tunelu

U ovom su radu prikazani rezultati mjerenja raspodjele aerodinamičkih tlakova nastalih pri kretanju vlaka velikih brzina, s ciljem određivanja efekata lokalnih tlakova, koji izazivaju dodatna opterećenja oplate vlaka. Ovaj rad prikazuje rezultate eksperimentalnog istraživanja modela vlaka u zračnom tunelu. Ispitivanje je izvršeno u dvije faze. Prva faza je obuhvatila mjerenje raspodjele tlaka na modelu vlaka. Druga faza obuhvaća mjerenje raspodjele tlaka oko modela vlaka pomoću češlja s 10 sondi. Rezultati eksperimenta uspoređeni su s rezultatima raspodjele tlaka dobivenih numeričkom simulacijom

MODELING OF RELIABILITY AND AVAILABILITY OF DATA TRANSMISSION IN RAILWAY SYSTEM

The analysis of the reliability and availability of the data transmission system within the integral railway system is realized through the modeling of the system, i.e. its conditions and their connections. According to the defined measure of safety of the International union of railways (UIC), i.e. its committee ORE, defined by recommendations A 158 and A 124/RP, based on previous experience and the achieved level of technical development, we can estimate an acceptable value for the probabilities of certain conditions of the integral railway system and data transmission system. In the paper, the reliability and availability analysis was modeled using the Markov model for data transmission in the railway system with four conditions, for: correct system condition, presence of disturbances in the system, illegal (dangerous) system condition and system blocking condition. The validity for the application of process development modeling the reliability and availability of data transmission in the railway system will contribute to reducing the risk of inadmissible (dangerous) failures, improving maintenance planning and spare parts planning, moving from maintenance by time to maintenance by condition and reducing exploitation costs

Safe Operation of Welded Structure with Cracks at Elevated Temperature

The fatigue crack growth rate parameters and conditions for abrupt fracture of thick joint in steel at room and operating temperature were analysed. Fatigue cracks generated from sharp weld defects are initial cracks that grow through either the weld joint region or the base metal in accordance with Paris law. Service life of a welded structure depends on position and orientation of the existing sharp weld defect. Different pre-cracked specimens were used in this experimental investigation. They were cut from the base and weld metals and heat-affected zone. In comparison with the base metal, weld joint region showed higher crack growth rate at operating and room temperatures. Fatigue crack growth rate was higher at operating temperature irrespective of the position. Reliability of structure with initial longitudinal cracks positioned in the heat-affected zone was lower than with initial transversal cracks located in the weld metal

Safe Operation of Welded Structure with Cracks at Elevated Temperature

The fatigue crack growth rate parameters and conditions for abrupt fracture of thick joint in steel at room and operating temperature were analysed. Fatigue cracks generated from sharp weld defects are initial cracks that grow through either the weld joint region or the base metal in accordance with Paris law. Service life of a welded structure depends on position and orientation of the existing sharp weld defect. Different pre-cracked specimens were used in this experimental investigation. They were cut from the base and weld metals and heat-affected zone. In comparison with the base metal, weld joint region showed higher crack growth rate at operating and room temperatures. Fatigue crack growth rate was higher at operating temperature irrespective of the position. Reliability of structure with initial longitudinal cracks positioned in the heat-affected zone was lower than with initial transversal cracks located in the weld metal