1. Developing an alternative calculation method for the smart readiness indicator based on genetic programming and linear regressionMitja Beras, Miran Brezočnik, Uroš Župerl, Miha Kovačič, 2025, izvirni znanstveni članek Opis: The European Union is planning to introduce a new tool for evaluating smart solutions in buildings—the Smart Readiness Indicator (SRI). As 54 energy efficiency categories must be evaluated, the triage process can be long and time-intensive. Altogether, 228 data points (or inputs) about the smartness of the buildings are required to complete the evaluation. The present paper proposes an alternative calculation method based on genetic programming (GP) for the calculation of Domains and linear regression (LR) for the calculation of Impact Factors and the total SRI score of the building. This novel calculation requires 20% (Domain ventilation and dynamic building envelope) to 75% (Domain cooling) fewer inputs than the original methodology. The present study evaluated 223 case study buildings, and 7 genetic programming models and 8 linear regression models were generated based on the results. The generated results are precise; the relative deviation from the experimental data for Domain scores (modelled with GP) ranged from 0.9% to 2.9%. The R2 for the LR models was 0.75 for most models (with two exceptions, with one with a value of 0.57 and the other with a value of 0.98). The developed method is scalable and could be used for preliminary and portfolio-level screening at early-stage assessments.
Ključne besede: SRI, modelling, genetic programming, linear regression, energy efficient buildings, smart buildings, optimisation
Objavljeno v DKUM: 03.11.2025; Ogledov: 0; Prenosov: 2
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2. Development of Methodology for Estimation of Energy-Efficient Building Renovation Using Application of MINLP-Optimized Timber–Glass Upgrade ModulesMaja Lešnik Nedelko, Stojan Kravanja, Miroslav Premrov, Vesna Žegarac Leskovar, 2025, izvirni znanstveni članek Opis: Vertical addition to already-existing structures is an approach to energy-efficient building renovation. It presents an opportunity for the densification of built-up areas and the construction of new usable spaces. While many studies have dealt with the subject of renovating buildings with a focus on energy efficiency, far fewer studies have specifically examined the potential of vertically extending existing buildings, an approach which could be introduced in new sustainable building policies. The objective of this study is to redevelop optimal timber–glass upgrade modules, considering the ideal proportions of glazing for all cardinal directions, by using discrete Mixed-Integer Non-Linear Programming optimization. The novelty of the suggested method resides in the synchronous optimization of the upgrade modules’ daylighting and energy-efficiency performance, resulting in the creation of optimization methods that can determine the optimal glazing proportions for all cardinal directions and incorporate rational design and window measurement. The impact of the developed Mixed-Integer Non-Linear Programming-optimized upgrade modules is compared to previously designed optimized upgrade modules. Finally, a methodology for estimating the energy efficiency of building renovations incorporating vertical additions using the timber–glass upgrade modules was developed, supporting the quick assessment of the reduction in hybrid buildings’ energy consumption for heating and cooling according to boundary conditions, presuming that they undergo the suggested renovations. The findings are applicable (not exclusively) to Slovenia’s residential building stock, which makes up around 20% of the country’s current housing stock and was mainly constructed between 1946 and 1970. This offers a substantial opportunity to improve the overall sustainability and energy efficiency of the country’s housing stock. The proposed approach offers a holistic solution to drive sustainable development in the built environment by incorporating all three pillars of sustainability (environmental, social, and economic).
Ključne besede: energy efficient building renovation, energy efficiency, building vertical addition, timber–glass upgrade modules, mixed-integer non-linear programming, MINLP, optimization, visual comfort, energy sustainability
Objavljeno v DKUM: 16.01.2025; Ogledov: 0; Prenosov: 6
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3. A brief measure of disgust propensityAnne Schienle, Saša Zorjan, Albert Wabnegger, 2022, izvirni znanstveni članek Opis: In the context of large-scale surveys, pre-screening or longitudinal studies, researchers may be faced with the choice of using a brief measure of disgust propensity (DP: the general tendency to respond with the emotion of disgust to any given situation) or using no measure at all. The goal of the present study was to develop and validate such a short scale based on the Questionnaire for the Assessment of Disgust Propensity (QADP); Schienle et al., 2002). The participants (n=1367; 80% female; mean age = 28 years) completed the QADP, and scales on disgust sensitivity and self-disgust. Brain structural data and disgust rating data were available for subsets of the total sample. Factor analysis revealed a five-factor structure of the QADP. A total of 10 items (two items for each factor) with the highest item-total correlations were selected. The resulting five-factor QADP (Cronbach's alpha =.76) covers a broad range of disgust domains. The short QADP is correlated with the original questionnaire (r=.90), disgust sensitivity, disgust ratings for gustatory, olfactory and visual disgust elicitors, and volume in the insular cortex (a brain region involved in disgust processing). For future investigations, the QADP_brief can be a useful tool for assessing DP with high time efficiency.
Ključne besede: disgust propensity, short questionnaires, time-efficient assesments
Objavljeno v DKUM: 18.11.2024; Ogledov: 0; Prenosov: 11
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4. Are African stock markets efficient? : a comparative analysis between six African markets, the UK, Japan and the USA in the period of the pandemicRui Dias, João M. Pereira, Luísa Cagica Carvalho, 2022, izvirni znanstveni članek Opis: The aim of this study is to test and compare the efficient market hypothesis,
in its weak form, on the stock markets of Botswana, Egypt, Kenya, Morocco,
Nigeria, South Africa, Japan, the UK and the USA from 2 September 2019 to 2
September 2020. This study is based on the following research question: has
the global pandemic (COVID-19) reduced the efficiency – in its weak form – of
African financial markets compared to the mature markets of the UK, Japan and
the USA? The results sustain the evidence that the random walk hypothesis is not
supported by the financial markets analysed in the period of the global pandemic.
The variance ratio values are lower than the unit, which implies that the returns
are self-correlated over time. A reversion to the average is also observed, with
no differences identified between mature and emerging financial markets. In
corroboration, the Detrended Fluctuation Analysis (DFA) exponents show that the
financial markets present signs of (in)efficiency in its weak form, thus showing
persistence in the yields. This therefore implies the existence of long memories
validating the results of the variance using the Wright’s Rank and Signs Test
(2000), which prove the rejection of the random walk hypothesis.
Ključne besede: African stock markets, efficient market hypothesis, mean reversion, random walk
Objavljeno v DKUM: 19.06.2023; Ogledov: 399; Prenosov: 31
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5. A new approach to rebates after Intel caseSandra Fišer Šobot, 2018, izvirni znanstveni članek Opis: Although heated debates are quite common in the law on abuses of dominant position, it is not an exaggeration to state that Intel case has generated an unusual storm of comments and discussions. In 2009, the European Commission fined Intel 1.06 billion % for abusing dominant position by granting exclusivity rebates. In 2014, the General Court rendered judgment in support of the European Commission's decision. In 2017, the Court of Justice of the European Union set aside that judgment and referred the case back to the General Court in order for it to examine Intel's arguments regarding the capacity of the rebates at issue to restrict competition. This long awaited ruling in the Intel case is so far one of the most important judgments regarding exclusivity rebates and Art. 102 TFEU enforcement. The paper addresses relevant issues and conclusions in relation to the exclusivity rebates. Additionally, the author attempts to assess possible effects and implications of the Courts of Justice's judgment.
Ključne besede: Art. 102 TFEU, abuse of dominant position, exclusivity rebates, the "as efficient competitor" test, effects-based approach
Objavljeno v DKUM: 15.01.2021; Ogledov: 787; Prenosov: 24
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6. The development of ARM-based portable and adaptable power supply : magistrsko deloTomislav Brlek, 2019, magistrsko delo Opis: This master’s thesis describes a development of a portable and adjustable power supply. The first part of the thesis introduces us to the working principle of power supplies in general. Next, we present a functional design of a portable and adjustable power supply and a list of its required functionalities. Chapter “switched-mode power supplies” introduces us to the theoretical basics of the said power supplies, while chapter “linear regulators” introduces us to different types of linear regulators and tells us more about how they work. Everything regarding which microcontroller was used and why it was used is described in the “ARM microcontroller” chapter. Besides microcontrollers, it also talks about which integrated development environment is used and how the microcontroller is programmed. A full and detailed description of each part of the analog circuitry can be found in the chapter “describing the development of the portable and adjustable power supply”. Lastly, the user interface is described in detail.
Ključne besede: portable power supply, ARM processor, variable laboratory bench power supply, LCD touchscreen, energy efficient, lithium battery, battery charger, voltage control
Objavljeno v DKUM: 13.11.2019; Ogledov: 1164; Prenosov: 152
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7. Long memory in the Croatian and Hungarian stock market returnsMejra Festić, Alenka Kavkler, Silvo Dajčman, 2012, izvirni znanstveni članek Opis: The objective of this paper is to analyze and compare the fractal structure of the Croatian and Hungarian stock market returns. The presence of long memory components in asset returns provides evidence against the weak-form of stock market effi ciency. The starting working hypothesis that there is no long memory in the Croatian and Hungarian stock market returns is tested by applying the Kwiatkowski-Phillips-Schmidt-Shin (KPSS) (1992) test, Loʼs (1991) modified rescaled range (R/S) test, and the wavelet ordinary least squares (WOLS) estimator of Jensen (1999). The research showed that the WOLS estimator may lead to different conclusions regarding long memory presence in the stock returns from the KPSS and unit root tests or Loʼs R/S test. Furthermore, it proved that the fractal structure of individual stock returns may be masked in aggregated stock market returns (i.e. in returns of stock index). The main finding of the paper is that both the Croatian stock index Crobex and individual stocks in this index exhibit long memory. Long memory is identified for some stocks in the Hungarian stock market as well, but not for the stock market index BUX. Based on the results of the long memory tests, it can be concluded that while the Hungarian stock market is weak form efficient, the Croatian stock market is not.
Ključne besede: stock market, long memory, efficient-market hypothesis, Croatia, Hungary
Objavljeno v DKUM: 18.07.2017; Ogledov: 1163; Prenosov: 103
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8. Partitioning the vertex set of ▫$G$▫ to make ▫$G \Box H$▫ an efficient open domination graphTadeja Kraner Šumenjak, Iztok Peterin, Douglas F. Rall, Aleksandra Tepeh, 2016, izvirni znanstveni članek Opis: A graph is an efficient open domination graph if there exists a subset of vertices whose open neighborhoods partition its vertex set. We characterize those graphs ▫$G$▫ for which the Cartesian product ▫$G \Box H$▫ is an efficient open domination graph when ▫$H$▫ is a complete graph of order at least 3 or a complete bipartite graph. The characterization is based on the existence of a certain type of weak partition of ▫$V(G)$▫. For the class of trees when ▫$H$▫ is complete of order at least 3, the characterization is constructive. In addition, a special type of efficient open domination graph is characterized among Cartesian products ▫$G \Box H$▫ when ▫$H$▫ is a 5-cycle or a 4-cycle.
Ključne besede: efficient open domination, Cartesian product, vertex labeling, total domination
Objavljeno v DKUM: 10.07.2017; Ogledov: 1085; Prenosov: 176
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9. Efficient open domination in graph productsDorota Kuziak, Iztok Peterin, Ismael G. Yero, 2014, izvirni znanstveni članek Opis: A graph ▫$G$▫ is an efficient open domination graph if there exists a subset ▫$D$▫ of ▫$V(G)$▫ for which the open neighborhoods centered in vertices of ▫$D$▫ form a partition of ▫$V(G)$▫. We completely describe efficient open domination graphs among lexicographic, strong, and disjunctive products of graphs. For the Cartesian product we give a characterization when one factor is ▫$K_2$▫.
Ključne besede: graph theory, efficient open domination, graph products, total domination
Objavljeno v DKUM: 10.07.2017; Ogledov: 1379; Prenosov: 171
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10. Process integration of a steam turbineAndreja Goršek, Peter Glavič, 2003, izvirni znanstveni članek Opis: Cogeneration consists of combined production of electricity and heat using only one fuel which allows remarkable energy savings in comparison with a system producing electricity and heat separately. The possibilities for integrating a cogeneration system with chemical processes has been studied in this paper. Improvement in the systems where high temperature streams exist can be achieved by direct integration of steam turbine with them. Hot reactor utility was used instead of fuel to produce electricity and steam for further process heat requirements. A thermodinamics oriented approach to identify and preliminary design a cogeneration plant that completely satisfies process heat and power demand is highlighted. Pinch analysis with extended grand composite curve enables rational choice of utilities. The acrylic acid process was used to illustrate the procedure proposed. Economic attractiveness based on payback time and net present worth indicated that the steam turbine based cogeneration system would yield return period of less than 3 months, showing that the investment in cogeneration could be of interest for this plant.
Ključne besede: process energetics, efficient energy use, process industry, cogeneration systems, acrylic acid, technological processes
Objavljeno v DKUM: 01.06.2012; Ogledov: 2071; Prenosov: 106
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