The influence of façade colour, glazing area and geometric configuration of urban canyon on the spectral characteristics of daylightNataša Šprah
, Jaka Potočnik
, Mitja Košir
, 2024, original scientific article
Abstract: Since the non-image-forming (NIF) effect of daylight on the human circadian system is widely accepted, adequate exposure to daylight is now considered one of the elements of a healthy life. In urban environment, one of the prerequisites for adequately lit indoor spaces is the amount and quality of daylight reaching the window, which is highly dependent on the characteristics of the urban environment. The aim of the study was to determine whether there are correlations between urban density (i.e., distance between buildings, building height), façade surface characteristics (i.e., colour and Window-to-Wall Ratios – WWR) and NIF potential of daylight. The study was conducted on a parametric geometric model of a street canyon covering a wide range of characteristics. Simulation results were interpreted using the Relative Melanopic Efficacy coefficient and Sky View Factor. The results indicate that the colour of the opposite façade can substantially impact the resulting NIF potential, especially for orange-red or blue hues. The results of the study show that this influence for building heights between 3 and 8 storeys becomes significant when the width of the urban canyon is less than 25 m and becomes substantially smaller at WWRs above 30 %.
Keywords: urban planning, daylight, non-image forming effects of light, circadian light, urban canyon, façade colour
Published in DKUM: 19.01.2024; Views: 113; Downloads: 2
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Method for planning, optimizing, and regulating EV charging InfrastructureAmor Chowdhury
, Saša Klampfer
, Klemen Sredenšek
, Sebastijan Seme
, Miralem Hadžiselimović
, Bojan Štumberger
, 2022, original scientific article
Abstract: 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.
Keywords: service system, capacity planning, bursts, rush-hour, normal distribution, stochastic process
Published in DKUM: 24.08.2023; Views: 438; Downloads: 31
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Daylight provision requirements according to EN 17037 as a restriction for sustainable urban planning of residential developmentsNataša Šprah
, Mitja Košir
, 2020, original scientific article
Abstract: The attempt at a more sustainable land use by increasing urban density may have a negative effect on the daylighting of residential buildings. In densely built areas, obstructions generated by the surrounding buildings can substantially reduce the available amount of daylight, causing poorly daylit spaces and a less healthy indoor environment with higher electricity consumption as a consequence of artificial lighting. European standard EN 17037, Daylight in Buildings, was established in 2018 to ensure appropriately daylit spaces. In this paper, a three-step methodology was developed to investigate the relationship between certain urban planning parameters and the daylighting of a typical room defined by specific (Slovenian) legislative restrictions about its geometry and minimum required window to floor area ratio, in order to establish the maximum densities of residential developments still fulfilling the minimum requirements for daylight provision defined by EN 17037. The results show that a relatively low urban density is required to fulfil the stipulations for minimum daylight provision for the deepest permissible room according to the Slovenian legislation. The impact of the development floor area ratio on the daylighting potential of buildings was identified as significant, followed by the site coverage, development layout, and building typology. Furthermore, the developed methodological approach clearly demonstrates a substantial potential for application in urban planning, with indoor daylight environmental conditions being linked to the planning of residential developments in the earliest stages of the project.
Keywords: sustainable urban planning, daylighting, vertical daylight factor, residential developments, solar potential
Published in DKUM: 14.07.2023; Views: 305; Downloads: 28
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Assembly line optimization using MTM time standard and simulation modeling—A case studyMatic Breznik
, Borut Buchmeister
, Nataša Vujica-Herzog
, 2023, original scientific article
Abstract: 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.
Keywords: optimization, production planning, assembly line, MTM time standard, simulation, industry 4.0
Published in DKUM: 23.05.2023; Views: 313; Downloads: 38
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Planning and construction of the lifting and towing device of the autonomous mobile robot MiR 100 for the delivery of transport trolleys in intralogisticsTone Lerher
, Aleš Belšak
, Rok Skerbiš
, Jure Tumpej
, Žiga Volavšek
, Domen Stamenov
, Marko Motaln
, 2022, published scientific conference contribution
Abstract: Intralogistics is a very important area in warehousing and production for managing the flow of materials and informational flow. In recent years, automation and especially robotisation have had a major impact on throughput performance in intralogistics. Especially important is the transport of materials and products based on automated guided vehicles (AGVs) and autonomous mobile robots (AMRs) with different top modules,
such as the lifting and towing device.
In this paper, planning and construction of the lifting and towing device of the autonomous mobile robot MiR 100 for the delivery of transport trolleys in intralogistics is presented. Using the engineering design methods, a new design of the lifting and towing device has been proposed and evaluated.
Keywords: intralogistics, material handling systems, automation and robotisation, planning and construction, lifting and towing mechanism, simulation and animation
Published in DKUM: 15.03.2023; Views: 456; Downloads: 66
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A framework for managing future supply chain trends: utilization of lean, agile and leagile strategiesWaleed Rashad
, 2020, doctoral dissertation
Abstract: 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
Keywords: Keywords: supply chain strategies, lean, agility, leagility, supply chain future trends, supply chain management, grounded theory, scenario planning, supply chain collaboration, sourcing.
Published in DKUM: 04.03.2021; Views: 1209; Downloads: 141
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Mobilna aplikacija za ocenjevanje truda pri agilnih razvojnih metodah : diplomsko deloIvona Colakovic
, 2019, undergraduate thesis
Abstract: Ocenjevanje truda pri razvoju programske opreme je proces, ki lahko zelo pomaga pri planiranju projekta. V diplomskem delu predstavimo proces ocenjevanja truda, elemente procesa ter aktivnosti, katere se izvajajo. Osredotočamo se na ocenjevanje truda pri agilnem razvoju informacijskih sistemov ter klasificiramo obstoječe metode in pregledamo njihove prednosti in slabosti. Odločimo se za predstavitev pogosto uporabljene metode za ocenjevanje truda pri agilnem razvoju, in sicer Planning poker. Po analizi trga ugotovimo pomanjkljivosti obstoječih rešitev in določimo funkcionalnosti lastne rešitve. Prikažemo arhitekturo lastne rešitve in končni izdelek. Na koncu prikažemo izvedeni eksperiment z mobilno aplikacijo ter rezultate eksperimenta.
Keywords: ocenjevanje truda, agilni razvoj, mobilna aplikacija, Planning poker
Published in DKUM: 25.11.2019; Views: 1394; Downloads: 111
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The development of sustainable mobility plan (SUMP), example for city of Sinj, CroatiaAnđelo Marunica
, 2019, master's thesis
Abstract: 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.
Keywords: SUMP, city of Sinj, sustainable mobility plan, sustainable mobility, sustainable mobility planning methodology
Published in DKUM: 23.09.2019; Views: 981; Downloads: 95
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