Iskanje po katalogu digitalne knjižnice

Opis: The paper presents and solves the problems of modeling and designing the required EV charging service capacity for systems with a slow dynamic component. This includes possible bursts within a peak hour interval. A simulation tool with a newly implemented capacity planning method has been developed and implemented for these needs. The method can be used for different system simulations and simultaneously for systems with high, medium, and low service dynamics. The proposed method is based on a normal distribution, a primary mechanism that describes events within a daily interval (24 h) or a peak hour interval (rush hour). The goal of the presented approach, including the proposed method, is to increase the level and quality of the EV charging service system. The near-optimal solution with the presented method can be found manually by changing the service capacity parameter concerning the criterion function. Manual settings limit the number of rejected events, the time spent in the queue, and other service system performance parameters. In addition to manual search for near-optimal solutions, the method also provides automatic search by using the automation procedure of simulation runs and increasing/decreasing the service capacity parameter by a specifically calculated amount.
Ključne besede: service system, capacity planning, bursts, rush-hour, normal distribution, stochastic process
Objavljeno v DKUM: 24.08.2023; Ogledov: 357; Prenosov: 23
Celotno besedilo (5,63 MB)
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Opis: This study presents an approach to solving the assembly line balancing problem (ALBP) using the Methods-Time Measurement (MTM) time standard and simulation software. ALBP is a common problem in manufacturing where a set of tasks with fixed times must be assigned to a series of sequential workstations in order to minimize the total idle time and reduce the assembly cost per product. This study uses MTM, a widely used production process scheduling method, to create a new time analysis of an assembly process that was previously balanced using the Work-Factor method and time study. This literature review shows that there are a lack of combinations of updated time analyses with newer simulation approaches in the current literature, and this was the motivation for the present work. An assembly line simulation was performed using Simio software to evaluate different design options and operating scenarios. The results show that the use of MTM and simulation can help minimize idle time and improve assembly line performance, thereby reducing costs and increasing efficiency. This study shows that the approach of using MTM and simulation is effective in solving ALBP and is a useful tool for manufacturing companies to improve the performance of their assembly lines and reduce costs.
Ključne besede: optimization, production planning, assembly line, MTM time standard, simulation, industry 4.0
Objavljeno v DKUM: 23.05.2023; Ogledov: 236; Prenosov: 28
Celotno besedilo (3,25 MB)

Opis: The supply chain has become very essential to run any business nowadays. Throughout the history of business, the professionals have been trying always to find out the best practice, and as long as the business concept is evolved over time, the practice, methodologies and techniques of doing the business also have been evolved. This evolvement led to the concept of supply chain initially and then later it became essential to have strategy for supply chain. The evolvement of the markets, globalization, and new technologies became very decisive subjects for building any supply chain and developing its strategy, but there are many other events that may take place which could enforce the supply chain decision makers to change the current approach of running their business. The dynamic business environment and the possible future trends of the global markets represent a real challenge for development of appropriate supply chain strategies, like lean, agility, and leagility. Therefore, it is very important to assess how different possible strategies are suitable for the future changes of the markets? This is to enable the supply chain to be prepared with adequate strategies for different future scenarios. To achieve this aim of preparing the supply chains for the future with adequate strategies, a deep study is done to research lean, agility and leagility, explaining the similarities and differences of these concepts. These strategies are dealing with the most important factors in supply chains; the time and the cost, what is the key reason for selecting these particular strategies lies in the fact, that they are concerned with improving the effectiveness and responsiveness in the supply chain and this is extremely important for the future. We continued study of these strategies by development of three possible future scenarios for energy scarcity, new international monetary system, and wars. The reason of developing these particular scenarios is because they are concerned with the most important political and economic events which could happen and affect the supply chains in the future (EY, 2013; Cook, 2006; Sokov, 2015). These scenarios are established to anticipate the possible challenges which could face the supply chain strategies in the future and to evaluate the suitability of supply chain strategies for such future scenarios. A survey of 150 supply chain professionals, who are working currently in the field of supply chain management, is done in two phases. The first phase is focusing on recognition of the opinions of surveyed supply chain professionals towards the supply chain strategies and their utilization. Based on the theoretical knowledge of the academic literature reviewed in this research, proposed scenarios, and the feedback of professionals in the survey, it was evident that supply chains’ managers need adequate framework, which will support improvement of current and future supply chain management. Therefore, the grounded theory methodology is used to create a new conceptual framework. The core idea of the proposed framework is to improve the global sourcing practice, which consequently will enable improving the management of supply chains according to the predicted scenarios. A second phase of survey is conducted to present the proposed framework to the supply chain professionals for evaluation. The proposed framework adds value to the global sourcing process, which enhancing the supply chain collaboration and helps to support the selected supply chain strategies for consideration – i.e., lean, agility, and leagility, to work better in the future. The proposed framework represents scientific contribution to the supply chain strategies utilization in practice. The results of this contribution are obviously to fill the gap highlighted by the supply chain professionals in the survey, who highlighted the essential need for improvement to the supply chain collaboration globally, and this will be the basic c
Ključne besede: Keywords: supply chain strategies, lean, agility, leagility, supply chain future trends, supply chain management, grounded theory, scenario planning, supply chain collaboration, sourcing.
Objavljeno v DKUM: 04.03.2021; Ogledov: 1102; Prenosov: 138
Celotno besedilo (3,64 MB)

Opis: SUMP (Sustainable Urban Mobility Plan) is an innovative way of planning urban traffic in order to meet the needs of citizens in a sustainable way. Unlike the traditional approach to traffic planning, SUMP places a special emphasis on citizen and other stakeholders involvement and participation, in which different decisions regarding various sectors such as traffic, spatial planning, economic development, social activities, health, safety, energy, etc. are coordinated . The SUMP concept for the city of Sinj proposes 30 measures compiled in 6 themed packages, which are expected to greatly improve the quality of traffic in the city, in addition to reducing air pollution and improving the quality of life for residents of Sinj, while simultaneously, to a certain extent, stimulating economic growth and reversing demographic decline which is currently affecting the municipality of Sinj.
Ključne besede: SUMP, city of Sinj, sustainable mobility plan, sustainable mobility, sustainable mobility planning methodology
Objavljeno v DKUM: 23.09.2019; Ogledov: 923; Prenosov: 95
Celotno besedilo (3,78 MB)

Ključne besede: environmental impact assessment, EIA, sustainability, infrastructure planning
Objavljeno v DKUM: 11.05.2018; Ogledov: 1788; Prenosov: 91
Celotno besedilo (1,12 MB)
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