## Literature Review  
### Importance of Industry 4.0  
In Europe, the danger of an aging society has long been known, so that each country faces a decline in its workforce [10]. Power-generating technology such as robotization and automation has long existed. The Internet, however, revolutionizes process organization by networking robotic and automated devices. The development of the Internet and technology creates a continuous network of people, machines and companies, and through the continuous sharing of value-creating processes, it is now possible to produce a competitive, fully-customized product for the buyer. By Industry 4.0, we mean the intelligent networking of industrial products and processes. In 2013, the Frauenhofer Institute reviewed the productivity and growth potential of companies using Industry 4.0 technologies. Its main impact comes from five technology areas: Embedded systems, smart factories, strong networks, cloud computing and IT (Information Technology) security [11]. [PERSON] et al. [12], however, collected nine technologies that characterize leading companies in the Fourth Industrial Revolution. These include technical tools and methods. These are automated robots, simulation, horizontal and vertical system integration, industrial IoT, cyber security, cloud-based services, additive production (3D printing), augmented reality, and big data analysis. Today, in an Industry 4.0 factory, machines are connected as a collaborative community. Such evolution requires the use of advance prediction tools, so that data can be systematically processed into information to explain uncertainties and thus make more informed decisions [13]. It can be concluded that the term Industry 4.0 describes different--primarily Information Technology (IT) driven--changes in manufacturing systems. These developments not only have technological but also versatile organizational implications [14]. According to [PERSON] et al. [15], however, Industry 4.0 is the actual digitization of industry, which now covers a new, fairly broad conception, and includes new technologies and concepts relating to the organization of the value chain. Industry 4.0 creates a modularly structured smart factory, meaning the Cyber Physical System (CPS) monitors physical processes, maps the physical world in the virtual world, and decentralizes operational decision-making (autonomous machines). The perception of the productivity of new technologies is influenced, on the one hand, by company-level calculations that have shown that Industry 4.0 investments have clearly increased investor productivity [16]. It is worth considering the possibility that the timing of the studies may distort the conclusions drawn from the results. Most of the large investments of the 2010s were carried out by well-equipped, high-performing leading companies with a good capital base, meaning that these observations cannot be generalized or even predicted at the macro level. At the same time, calculations have also been made at the national economy level, including reference [17], which, by examining 17 countries, clearly demonstrates the effects of industrial robots on economic growth and productivity gains. Using IT investments increases production, resulting in growing revenue and profit as well as higher product quality and performance through the introduction of new tools [18]. In their analysis, [PERSON], [PERSON] and [PERSON] [4] analyzed Industry 4.0 investments in each industry and found that the largest investments are now being carried out by the electronics industry, and it is expected that this will continue to be so in the future. By 2020, the value of investments will reach 243 billion US dollars a year. Accelerated industrial digitization is trying to respond to rapidly changing customer needs. Due to ever new product variants expected by customers, the product lifecycle is considerably shortened, so work on the innovation of the product, and the technology needed to produce it, has to be kept up-to-date.