György Kovács

University of Miskolc · Institute of Manufacturing Science

The study presents a comparative analysis of the reliability of marine and industrial diesel engines, emphasizing the role of heat exchangers. Diesel engines in marine vessels and industrial applications face distinct challenges, influencing their reliability. This paper examines these differences, focusing on operational conditions, load profiles,...

This paper explores the implementation and possibilities of utilizing fuzzy logic theory for optimal operation and early fault detection in marine diesel engines. It emphasizes its role in managing the complexity and ambiguity inherent in engine performance and preventive maintenance. Preventive maintenance is crucial for ensuring the reliability a...

Recently, the main aim of the road freight transportation sector has been the establishment of a cost-effective and sustainable operation because it is one of the most environmentally damaging and most expensive elements of the supply chains’ activities. The efficiency improvement and optimization of these transport activities can result in signifi...

Prognostic and health management (PHM) methods focus on improving the performance and reliability of systems with a high degree of complexity and criticality. These systems include engines, turbines, and robotic systems. PHM methods involve managing technical processes, such as condition monitoring, fault diagnosis, health prognosis, and maintenanc...

Industrial robots have a key role in the concept of Industry 4.0. On the one hand, these systems improve quality and productivity, but on the other hand, they require a huge amount of energy. Energy saving solutions have to be developed and applied to provide sustainable production. The purpose of this research is to develop the optimal control str...

The transportation industry needs lightweight structures to meet economic and environmental demands. Composite sandwich structures offer high stiffness and low mass, making them ideal for weight reduction in high-speed trains. The objective of this research is to develop a method of weight and cost optimization for floors of high-speed trains. The...

Implementing adequate diagnostic strategies for marine engines offers a good possibility to focus on the early recognition of potentialproblems and prevent catastrophic and costly consequences. The successful and increasing application of diagnostic systems and devices for machines depends significantly on the precision of the diagnostic approaches...

Lightweight composite sandwich structures are widely used in the automotive industry, particularly in vehicle body applications, due to their advantageous properties, e.g. low density, high stiffness and high strength-to-weight ratio. The goal of the research was the elaboration of an optimization method for a totally Fiber Reinforced Plastic (FRP)...

Improving the fuel efficiency of heavy-duty trucks is essential for sustainable energy supply and future economic development. Consequently, new technologies are needed to enhance energy security in the transportation sector. In this context, this study investigates the optimal design of a composite sandwich panel as a lightweight structure to repl...

Knowledge-Based Systems apply Artificial Intelligence techniques to solve difficult problems in complex systems that well-trained experts can only manage. These systems can support the decision-making of inexperienced people with the necessary tools to do work that requires high expertise. These systems depend on three main resources: human experti...

Diagnostic strategies play a vital role in achieving high competitiveness, better productivity and improving workplace safety because the technical diagnoses provide solutions for all issues related to the following tasks: determination of the actual technical conditions; detection of the defects; isolation and identification of the component that...

Currently, the most important structural design aims are weight reduction, corrosion resistance, high stiffness and vibration damping in several industrial applications, which can be provided by the application of advanced fiber-reinforced plastic (FRP) composites. The main research aim was to develop novel and innovative multicellular plate struct...

Napjainkban az egyre gyorsabban változó gazdasági környezet, a globális piaci verseny, valamint a világjárvány okozta gazdasági kihívások következtében a gyártó vállalatok egyre nagyobb hangsúlyt fektetnek költségeik csökkentésére és gyártási, szerelési tevékenységeik hatékonyságának javítására versenyképességük megőrzése érdekében. A Lean gyártási...

Nowadays, the application of composite materials and light-weight structures is required in those industrial applications where the primary design aims are weight saving, high stiffness, corrosion resistance and vibration damping. The first goal of the study was to construct a new light-weight structure that utilizes the advantageous characteristic...

The application of fiber-reinforced plastic (FRP) composites as structural elements of air vehicles provides weight saving, which results in a reduction in fuel consumption, fuel cost, and air pollution, and a higher speed. The goal of this research was to elaborate a new optimization method for a totally FRP composite construction for helicopter f...

Nowadays, resources for production (raw materials, human, energy, etc.) are limited, while population, consumption and environmental damage are continuously increasing. Consequently, the current practices of resource usage are not sustainable. Therefore, manufacturing companies have to change to environmentally friendly and innovative technologies...

Composite material-due to low density-causes weight savings, which results in lower fuel consumption of transport vehicles. The aim of the research was to change the existing base-plate of the aluminum airplane container with the composite sandwich plate in order to reduce the weight of the containers of cargo aircrafts. The newly constructed sandw...

Due to globalization and increased market competition, forwarding companies must focus on the optimization of their international transport activities and on cost reduction. The minimization of the amount and cost of fuel results in increased competition and profitability of the companies as well as the reduction of environmental damage. Nowadays,...

The application of fiber-reinforced plastic (FRP) composite materials instead of metals, due to the low density of FRP materials, results in weight savings in the base plates of aircraft pallets. Lower weight leads to lower fuel consumption of the aircraft and thereby less environmental damage. The study aimed to investigate replacing the currently...

Recently, the elements of Industry 4.0 have to be implemented at manufacturing companies in order to maintain their competitiveness. So the optimal operation and control of industrial robots are important tasks. Therefore, the topic of the article is important and up-to-date. Different control techniques are used in case of serial rigid robot manip...

Fiber Reinforced Polymers (FRP) have important role in the construction of the sandwich structures due to their advanced mechanical properties and excellent compatibility. Therefore, these structures are used in many industrial fields, such as automotive, aerospace and civil engineering. In this study, a Finite Element model for a Representative Vo...

Collaborating industrial robots and Simulation, as virtual modelling and design tool are key elements of Industry 4.0 conception. Nowadays, the application of industrial robots results in significant improvement of efficiency of production lines and the quality of the final products. Construction of productive industrial robots requires application...

Recently, the elements of Industry 4.0 as the Artificial Intelligence (AI) and the Machine Learning (ML) are implemented at the manufacturing companies in order to increase their competitiveness. These elements have important role in robotics technology where the main aim is the efficiency improvement, which requires the improvement on the rigid, i...

The application of the Industry 4.0 s elements-e.g., industrial robots-has a key role in the efficiency improvement of manufacturing companies. In order to reduce cycle times and increase productivity, the trajectory optimization of robot arms is essential. The purpose of the study is the elaboration of a new "whip-lashing" method, which, based on...

The aim of the research was to develop a new lightweight sandwich structure, which can be used for elements of air containers. The structure consists of aluminum foam core with fiber reinforced composite face-sheets. Nine different laminated glass or/and carbon fiber reinforced plastic face-sheet combinations were investigated. Finite element analy...

In recent years, industrial robots have played an important role in the revolution of a production line in factories, and especially in the growth of Industry 4.0 concept, due to their flexibility to execute tasks and cooperate with their environment fluently, today manipulator arms takes a large part in the production chain especially in the autom...

In the last decade, industrial robotics sector has known an evolution at level of its technological platform, especially with the appearance of Industry 4.0, therefore we are entering a new era of automation where intelligent production and digital factories produce increasingly complex and high-volume quality products with less human effort. The a...

The aim of the article was to verify the optimum design of solar sandwich panels for microsatellites applications. The sandwich panel consists of aluminum honeycomb core and aluminum materials facesheets. In this study, a methodology for a combined weight and/or cost optimization for sandwich panel with aluminum facesheets and honeycomb core is pre...

Warehousing activity is essential for all manufacturing companies (final assemblers and suppliers) of the global supply chains. Warehouses are also key elements of global automotive supply chains because the optimal formation and operation of warehouses play important role in manufacturing companies in order to maintain and increase their competiti...

A folyamatosan változó és növekvő kereslet csökkenti a termékek piacra jutásának idejét, így a termelési rendszer rendkívüli kihívásokkal néz szembe. Fontos feladat ezért, hogy a mérnökök pontosan megtervezzék a szerelési folyamatot, amelyhez segítséget nyújtanak az MTM-módszerek. A tanulmány célja az MTM (Methods Time Measurement) elemző módszer b...

Global market competition and fluctuating customers’ demands require manufacturing enterprises to focus on cost reduction and efficiency improvement to increase competitiveness and sustainability. The purpose of the research was the elaboration of the methodology and procedure of a new combined efficiency improvement method which basically applies...

A globalizációnak, a piaci versenynek és az egyre egyedibb termékeknek köszönhetően a termelő és a szolgáltató vállalatoknak fókuszálniuk kell a költséghatékony és profitábilis működésre. A késztermékek piaci sikerét a teljes ellátási lánc megfelelő kialakítása jelentősen befolyásolja, ezért elengedhetetlen a globális ellátási láncok optimálása. A...

The purpose of the research was to develop a new sandwich plate (aluminium face-sheets and honeycomb core), which can be used for manufacturing of a lightweight base plate for air cargo containers. The application of lightweight containers results significant weight savings compared to the conventional aluminium base plate, lower fuel consumption a...

Many international manufacturing and development companies are competing to design lightweight containers to meet the requirements of shipping and airlines carriers. Nowadays, honeycomb sandwich structure are widely applied in the field of industry of shipping and air cargo container which, consist of Aluminum honeycomb core and composite material...

Smart Factory is a complex system that integrates the main elements of the Industry 4.0 concept (e.g., autonomous robots, Internet of Things, and Big data). In Smart Factories intelligent robots, tools, and smart workpieces communicate and collaborate with each other continuously, which results in self-organizing and self-optimizing production. The...

Recent tendencies – such as the life-cycles of products are shorter while consumers require more complex and more unique final products – poses many challenges to the production. The industrial sector is going through a paradigm shift. The traditional centrally controlled production processes will be replaced by decentralized control, which is buil...

Tables of demography and representativeness of the study population. Distribution of centers recruiting the study population.

Comorbidities and complications in acute pancreatitis.

Joint effect of aging and comorbidities on local and systemic complications of AP.

Results of univariate analysis on the effects of individual comorbidities on the outcomes of acute pancreatitis.

Correlation between age and LOH (A panel), and CCI and LOH (B panel).

Figures of demography and representativeness of the study population.

Data used in multivariate analysis.

Results of multivariate analysis on the effects of individual comorbidities on the outcomes of acute pancreatitis.

Aging and complications in acute pancreatitis.

Presently, an increasing human population, customer consumption, and global market competition result in the reduction of natural resources and growing environmental damage. Therefore, the current practice in the use of resources is not sustainable. The production companies have to focus not only on cost-effective and profitable operation, but at t...

Due to the optimization and efficiency improvement of freight transportation, fuel consumption and environmental damage are reduced. Furthermore, if companies are more profitable, they can afford to invest in environmentally friendly technologies. Consequently, transportation will become more economic, sustainable and environmentally friendly. Thre...

The underside of the containers floor is prone to wear and abrasion result of forklifts which are used to move the containers in ways they are not actually designed. The test of abrasion gives a good indication which the materials are suitable for these application. The device Taber Abraser uses for this test. This device is utilized as a way to fo...

In the changing economic environment, global competition where the customer demands are changing continuously, the enterprises have to focus on cost reduction, efficiency improvement, higher productivity and profitability. In the production, the resources (raw materials, humans, machines, equipment, etc.) are always limited. It is very important fo...

Due to growing market globalization, increasing global competition the forwarding companies are compete together for client orders. Clients will choose the quality and cheap service providers. In the study a precise calculation method and a total prime cost function are elaborated, the cost components of the prime cost function and calculation meth...

The transport activity is one of the most expensive processes in the supply chain and the fuel cost is the highest cost among the cost components of transportation. The goal of the research is to optimize the transport costs in case of a given transport task both by the selecting the optimal petrol station and by determining the optimal amount of t...

The selection of the petrol station for refuel and the amount of refilled fuel are not determined centrally at most transport companies, but depend on the individual decision of the driver, so that the total cost of the burned fuel is not minimal. The goal of this study is to elaborate a precise and reliable mathematical model and method for the de...

The transport activity is one of the most expensive processes in the supply chain. Forwarding and transport companies focuses on the optimization of transportation and the reduction of transport costs. The goal of this study is to develop a method which calculate the first (prime) cost of a given transport task more precisely than the state of the...

The world around us is a very complex and multi-parametric system, like the weather, traffic, operation of machines, production processes, service processes, etc. Understanding of the characteristics, operation and behaviour of these systems and processes is not easy due to their complexity. The design of optimal production and service procedures i...

Changing market environment, global competition, rapidly fluctuating customer demands and more complex global network of supply chains require new production conceptions (Pull, Lean) and technologies. Novel supply chain paradigms (1. Lean-, 2. Agile-, 3. Leagile Supply Chain) are forms in order to increase and maintain competitiveness of companies....

Growing market globalization, increasing global competition, more complex products results in application of new technologies, methods and business processes – due to the abovementioned tendencies novel supply chain strategies (Lean, Agile and Leagile Supply Chains) are established. In this study these supply chain concepts are being described and...

In a competitive market the manufacturing companies have to produce cost effective products which can be realized by minimized production cost and higher effectiveness. The application of Lean manufacturing philosophy in order to optimize costs and quality is gaining a competitive advantage. There are lots of Lean tools which can result the improve...

In a competitive market the manufacturing companies have to produce cost effective products which can be realized by minimized production cost and higher effectiveness. The effective facility planning can significantly reduce the operational costs of companies. An adequate facility layout can result in the improvement of the performance of the prod...

The growing market globalization, increasing global competition, more and more complex products require new technologies, methods and processes. The shorter life cycle and the complexity of final products and new customer requirements require efficient operation of supply chains (SC). Optimization of supply chains results new models, concepts of va...

The growing market globalization, increasing global competition, and more complex products results in application of new technologies, methods and business processes. Fast changing market environment and fluctuating customer demands require efficient operation of logistical processes. In this study the logistical tendencies and challenges are intro...

Optimization of supply chains results new models, concepts of value chains and new organization and cooperation forms of members. Nowadays growing market globalization, increasing global competition, more and more complex products requires new production technologies, methods and processes. The product life cycle is getting shorter and shorter, the...

The production process consists of activities that are required in transforming an input set to valuable outputs. Input set includes human resources, raw materials, components, equipments, energy, money, information, etc. Market globalization, increasing global competition, and more complex products result in application of new production and logis...

Determination of optimal petrol station selection and the optimal quantity of the amount of refilled fuel during long international transport loops is not defined by a central decision making process at forwarding companies, but it depends on the individual decision of the camion driver. Therefore the total cost of the burned fuel is not optimal. T...

Determination of optimal petrol station selection and the optimal quantity of the amount of refilled fuel during long international transport loops is not defined by a central decision making process at forwarding companies, but it depends on the individual decision of the camion driver. Therefore, the total cost of the burned fuel is not optimal....

This study shows the optimization method for a new complex structural model: laminated carbon fiber-reinforced plastic (CFRP) deck plates with polystyrene foam (EPS) inner core. The structure is designed for both minimal cost and minimal weight, taking into consideration the design constraints as follows: maximum deflection of the total structure,...

In this paper is introduced a virtual logistics enterprise's conception which support the examination of outsourcing in the case of finished goods warehouse. The paper is defined the outsourcing's alternatives of the possibility examinations regarding the finished goods storage. There is reviewed the VLE's fundamentals (performers, databases, progr...

This study shows single and multi-objective optimization of a new complex structural model [laminated carbon fiber reinforced plastic (CFRP) deck plates with aluminium (Al) stiffeners] which is depicted in Figure 1. The structure was designed for both minimal cost and minimal weight. Design constraints on maximum deflection of the total structure,...

Presentation of the possibilities of efficiency improvement in point-to-point passenger transport services. Determination of the possible types and the definition of the absolute and partial parallelism. Demonstration of the method used for eliminating the parallelisms. Presentation of the conditions required for the adoption of the ellaborated dec...

Presentation of the possibilities of efficiency improvement in maintenance networks. Presentation of the elements of the examined maintenance networks and description of its operation. Determination of the activities and the features of the maintenance de-centre. Demonstration of the recording method and the set of logistic indices to be evaluated....

This study presents the optimal design of a new complex structural model (laminated carbon fiber reinforced plastic (CFRP) deck plates with aluminium (Al) stiffeners). The structure was designed both for minimal cost and minimal weight. Design constraints on maximum deflection of the total structure, buckling of the composite plates, buckling of th...

The paper examines a warehouse system which is including some storage buildings and divided into storage zones based on product groups in case of changing structure and volume of order picked products. The products of a commission are collected from different zones of different storage buildings. Warehouses are through-stores: loading in is complet...

Az elmúlt négy évben elvégeztük számos, különféle kialakítású szerkezet analízisét. Az optimálás során több evolúciós módszert alkalmaztunk és hasonlítottunk össze. Különböző evolúciós módszerek összehasonlítása és alkalmazása: - genetikus algoritmus, - a differenciális evolúció módszere, - a részecskecsoport módszer. Az alkalmazott és továbbfejles...