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2. Private firm valuation using multiples : can artificial intelligence algorithms learn better peer groups?Timotej Jagrič, Dušan Fister, Stefan Otto Grbenic, Aljaž Herman, 2024, original scientific article Abstract: Forming optimal peer groups is a crucial step in multiplier valuation. Among others, the traditional regression methodology requires the definition of the optimal set of peer selection criteria and the optimal size of the peer group a priori. Since there exists no universally applicable set of closed and complementary rules on selection criteria due to the complexity and the diverse nature of firms, this research exclusively examines unlisted companies, rendering direct comparisons with existing studies impractical. To address this, we developed a bespoke benchmark model through rigorous regression analysis. Our aim was to juxtapose its outcomes with our unique approach, enriching the understanding of unlisted company transaction dynamics. To stretch the performance of the linear regression method to the maximum, various datasets on selection criteria (full as well as F- and NCA-optimized) were employed. Using a sample of over 20,000 private firm transactions, model performance was evaluated employing multiplier prediction error measures (emphasizing bias and accuracy) as well as prediction superiority directly. Emphasizing five enterprise and equity value multiples, the results allow for the overall conclusion that the self-organizing map algorithm outperforms the traditional linear regression model in both minimizing the valuation error as measured by the multiplier prediction error measures as well as in direct prediction superiority. Consequently, the machine learning methodology offers a promising way to improve peer selection in private firm multiplier valuation.
Keywords: private firm valuation, multiples, peer group, peer selection, artificial intelligence, self-organizing map
Published in DKUM: 01.07.2025; Views: 0; Downloads: 3
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3. Droplet-based screening of phosphate transfer catalysis reveals how epistasis shapes MAP kinase interactions with substratesRemkes A. Scheele, Laurens H. Lindenburg, Maya Petek, Markus Schober, Kevin N. Dalby, Florian Hollfelder, 2022, original scientific article Abstract: The combination of ultrahigh-throughput screening and sequencing informs on function and intragenic epistasis within combinatorial protein mutant libraries. Establishing a droplet-based, in vitro compartmentalised approach for robust expression and screening of protein kinase cascades (>107 variants/day) allowed us to dissect the intrinsic molecular features of the MKK-ERK signalling pathway, without interference from endogenous cellular components. In a six-residue combinatorial library of the MKK1 docking domain, we identified 29,563 sequence permutations that allow MKK1 to efficiently phosphorylate and activate its downstream target kinase ERK2. A flexibly placed hydrophobic sequence motif emerges which is defined by higher order epistatic interactions between six residues, suggesting synergy that enables high connectivity in the sequence landscape. Through positive epistasis, MKK1 maintains function during mutagenesis, establishing the importance of co-dependent residues in mammalian protein kinase-substrate interactions, and creating a scenario for the evolution of diverse human signalling networks.
Keywords: protein, epistasis, catalysis, phosphate transfer, MAP kinase
Published in DKUM: 04.07.2024; Views: 104; Downloads: 17
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4. Transforming and comparing data between standard SQUID and OPM-MEG systemsUrban Marhl, Anna Jodko-Wladzinska, Rüdiger Brühl, Tilmann Sander, Vojko Jazbinšek, 2022, original scientific article Abstract: Optically pumped magnetometers (OPMs) have recently become so sensitive that they are suitable for use in magnetoencephalography (MEG). These sensors solve operational problems of the current standard MEG, where superconducting quantum interference device (SQUID) gradiometers and magnetometers are being used. The main advantage of OPMs is that they do not require cryogenics for cooling. Therefore, they can be placed closer to the scalp and are much easier to use. Here, we measured auditory evoked fields (AEFs) with both SQUID- and OPM-based MEG systems for a group of subjects to better understand the usage of a limited sensor count OPM-MEG. We present a theoretical framework that transforms the within subject data and equivalent simulation data from one MEG system to the other. This approach works on the principle of solving the inverse problem with one system, and then using the forward model to calculate the magnetic fields expected for the other system. For the source reconstruction, we used a minimum norm estimate (MNE) of the current distribution. Two different volume conductor models were compared: the homogeneous conducting sphere and the three-shell model of the head. The transformation results are characterized by a relative error and cross-correlation between the measured and the estimated magnetic field maps of the AEFs. The results for both models are encouraging. Since some commercial OPMs measure multiple components of the magnetic field simultaneously, we additionally analyzed the effect of tangential field components. Overall, our dual-axis OPM-MEG with 15 sensors yields similar information to a 62-channel SQUID-MEG with its field of view restricted to the right hemisphere.
Keywords: optically pumped magnetometer, magnetoencephalography, superconducting quantum interference device, magnetic field map
Published in DKUM: 26.06.2024; Views: 153; Downloads: 16
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5. Pillars of city spatial sensitivity and their integration into sightseeing routesMelita Rozman Cafuta, Boštjan Brumen, 2020, original scientific article Abstract: Worldwide, many cities have appropriate and necessary conditions for the development of urban tourism. Some locations, although considered important for local tourist destinations as part of a standard repertoire, do not comply with modern standards. For tourism organisations, it is very important to plan the best possible sightseeing routes with the best sightseeing locations. Using the intuitive approach only, is not enough in the modern tourism industry. The focus of the presented research is an innovative approach to identify the most prosperous urban places that should be included in urban tourist offers. Empirical research was conducted, based on the analyticalmethod ofmentalmapping. For the research location,Maribor city (Slovenia, eu) has been chosen. A sample of 200 respondents was taken. They were asked to draw a city map twice, once for the daytime city and once for the nighttime city. Graphical results obtained reflect a subjective mental spatial idea of individual thinkingmode. Some locations in the city seemto be particularly important and visible. They were named "Pillars of Spatial Sensitivity" or, pss locations. pss locations are extremely suitable to be integrated in a tourist offer as building blocks of sightseeing routes.When processing the research results, 34 pss locations weremore or less frequently detected in Maribor city. 32 of them had different appearance frequency between day and night. Based on these results, it is possible to conclude that modified spatial circumstances affect the perception and utilisation of urban space. The research results make it obvious that spatial sensitivity of tourists depends on time. It is possible to design sightseeing routes adapted to the time component.
Keywords: urban tourism, pillars of spatial sensitivity, mental map, sightseeing location
Published in DKUM: 29.01.2024; Views: 289; Downloads: 30
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6. Sensitivity Analysis of Hybrid Powertrain Pre-calibration Algorithms : magistrsko deloSimon Šegula, 2023, master's thesis Abstract: Currently, meeting the new fuel consumption and emissions standards is the biggest challenge in the automotive industry. One of the solutions is hybridization of the vehicle’s powertrain. This brings with it larger complexity of the vehicle control unit and its pre-calibration. This thesis explores gear shift map and load point shift map, which are two pre-calibration maps included in the vehicle control unit. More specifically it delves in to how the pre-calibration maps are created and how changing their parameters impacts the fuel consumption of the vehicle. Algorithms and optimization simulations were created and performed using AVL’s tool called the Powertrain system optimizer (PSO) which was created within the MATLAB software.
Keywords: Hybrid electric vehicle, Hybrid powertrain, Gear shift map, Load point shift map, Pre-calibration.
Published in DKUM: 23.11.2023; Views: 393; Downloads: 0 |
7. Jordan maps and zero Lie product determined algebrasMatej Brešar, 2022, original scientific article Abstract: Let ▫$A$▫ be an algebra over a field ▫$F$▫ with ▫$\mathrm{char} (F) \ne 2$▫. If ▫$A$▫ is generated as an algebra by ▫$[[A,A],[A,A]]$▫, then for every skew-symmetric bilinear map ▫$\Phi:A \times A \to X$▫, where ▫$X$▫ is an arbitrary vector space over ▫$F$▫, the condition that ▫$\Phi(x^2,x)=0$▫ for all ▫$x \in A$▫ implies that ▫$\Phi(xy,z) +\Phi(zx,y) + \Phi(yz,x)=0$▫ for all ▫$x,y,z \in A$▫. This is applicable to the question of whether ▫$A$▫ is zero Lie product determined, and is also used in proving that a Jordan homomorphism from ▫$A$▫ onto a semiprime algebra ▫$B$▫ is the sum of a homomorphism and an antihomomorphism.
Keywords: bilinear map, zero Lie product determined algebra, derivation, Jordan derivation, Jordan homomorphism, functional identity
Published in DKUM: 18.08.2023; Views: 421; Downloads: 46
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8. Organizational mental map and conative competencesDarko Kovač, Andrej Bertoncelj, 2008, original scientific article Abstract: Employees with their knowledge, skills, behavior and personal traits impact the organizational learning. The concept of organizational mental map and conative competences, as inborn underlying characteristic that is influenced by employees being involved as well as endogenous and exogenous factors, is presented. Three Slovene small to mid-sized companies were studied in respect to the individual factors, especially conative competences, of their employees. The study suggests that conative side of mind and thus conative competences can actually influence the organizational learning. What matters in contemporary management practice is how hidden potentials are set free and how they intrinsically motivate employees according to their personal differences in capabilities. As conative competences are inborn and can not be learned but only encouraged, contrary to cognitive competences, it is important to better understand employees' personal traits.
Keywords: organizational learning, SME, conation, conatice competences, organizational mental map
Published in DKUM: 10.01.2018; Views: 1289; Downloads: 445
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9. On bilinear maps on matrices with applications to commutativity preserversMatej Brešar, Peter Šemrl, 2006, original scientific article Abstract: Let ▫$M_n$▫ be the algebra of all ▫$n times n$▫ matrices over a commutative unital ring ▫$mathcal{C}$▫, and let ▫$mathcal{L}$▫ be a ▫$mathcal{C}$▫-module. Various characterizations of bilinear maps ▫${,.,,,.,}: M_n times M_n to mathcal{L}$▫ with the property that ▫${x,y} = 0$▫ whenever ▫$x$▫ any ▫$y$▫ commute are given. As the main application of this result we obtain the definitive solution of the problem of describing (not necessarily bijective) commutativity preserving linear maps from ▫$M_n$▫ into ▫$M_n$▫ for the case where ▫$mathcal{C}$▫ is an arbitrary field; moreover, this description is valid in every finite dimensional central simple algebra.
Keywords: mathematics, matrix algebra, central simple algebra, functional identity, nonassociative product, Lie-admissible algebra, commutativity preserving map
Published in DKUM: 10.07.2015; Views: 1315; Downloads: 105
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10. On automorphisms of Banach algebrasMatej Brešar, 2002, original scientific article Abstract: Podana je razširitev Jacobsonovega izreka o gostoti na Banachove algebre z avtomorfizmi. Zatem so obravnave aplikacije tega izreka. Med drugim so karakterizirani avtomorfizmi ▫$alpha$▫ na Banachovi algebri z lastnostjo, da je preslikava ▫$alpha-1$▫ spektralno omejena.
Keywords: matematika, funkcionalna analiza, teorija operatorjev, avtomorfizem, Banachova algebra, izrek o gostoti, spektralno omejena preslikava, mathematics, functional analysis, operator theory, automorphism, Banach algebra, density theorem, spectrally bounded map
Published in DKUM: 10.07.2015; Views: 1286; Downloads: 114
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