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1.
Presence of alien Prunus serotina and Impatiens parviflora in lowland forest fragments in NE Slovenia
Mirjana Šipek, Eva Horvat, Ivana Vitasović Kosić, Nina Šajna, 2022, izvirni znanstveni članek

Opis: Temperate alluvial, riparian and lowland forests are the European forests with the greatest presence of invasive alien plants. Consequently, identifying the environmental conditions for and other drivers behind the establishment of invasive species in natural forest communities is crucial for understanding the invasibility of these habitats. We focused on fragments (patches) of Illyrian oak-hornbeam forest in NE Slovenia, which are the least studied in this regard. Because alien phanerophytes and therophytes are significantly over-represented compared to native plantsin lowland forests, we selected two representative invasives: the phanerophyte Prunus serotina and the therophyte Impatiens parviflora. By using logistic regression models on vegetation surveys, environmental data based on Ellenberg´s indicator values, and patch metrics, we identified patch characteristics explaining the presence of each species. Moreover, we included human impact in the models. We reveal significant characteristics differentiating P. serotina from I. parviflora. We also show that the perimeterarea ratio and soil nutrients of the forest patches correlate significantly with the presence of P. serotina, while human disturbance correlates significantly with the presence of I. parviflora. Our results and a similar approach for other invasive plant species can be applied to assess habitat invasibility on potential and species’ current geographic distribution, as well as to develop management plans.
Ključne besede: biological invasions, forest fragmentation, landscape metrics, habitat characteristics, human presence, anthropogenic factors, neophytes, Slovenia
Objavljeno v DKUM: 12.07.2024; Ogledov: 80; Prenosov: 5
.pdf Celotno besedilo (460,99 KB)
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Gaussian null coordinates for rotating charged black holes and conserved charges
Mirjam Cvetič, Christopher N. Pope, Aritra Saha, Alejandro Satz, 2020, izvirni znanstveni članek

Opis: Motivated by the study of conserved Aretakis charges for a scalar field on the horizon of an extremal black hole, we construct the metrics for certain classes of four-dimensional and five-dimensional extremal rotating black holes in Gaussian null coordinates. We obtain these as expansions in powers of the radial coordinate, up to sufficient order to be able to compute the Aretakis charges. The metrics we consider are for 4-charge black holes in four-dimensional STU supergravity (N = 2 supergravity coupled to three vector multiplets) (including the Kerr-Newman black hole in the equal-charge case) and the general 3-charge black holes in five-dimensional STU supergravity. We also investigate the circumstances under which the Aretakis charges of an extremal black hole can be mapped by conformal inversion of the metric into Newman-Penrose charges at null infinity. We show that while this works for four-dimensional static black holes, a simple radial inversion fails in rotating cases because a necessary conformal symmetry of the massless scalar equation breaks down. We also discuss that a massless scalar field in dimensions higher than four does not have any conserved Newman-Penrose charge, even in a static asymptotically flat spacetime.
Ključne besede: supergravitiy, flat spacetime, black hole, four-dimensional rotating, metrics
Objavljeno v DKUM: 16.10.2023; Ogledov: 290; Prenosov: 15
.pdf Celotno besedilo (244,90 KB)
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4.
T-branes and G(2) backgrounds
Rodrigo Barbosa, Mirjam Cvetič, Jonathan J. Heckman, Craig Lawrie, Ethan Torres, Gianluca Zoccarato, 2020, izvirni znanstveni članek

Opis: Compactification of M-string theory on manifolds with G(2) structure yields a wide variety of 4D and 3D physical theories. We analyze the local geometry of such compactifications as captured by a gauge theory obtained from a three-manifold of ADE singularities. Generic gauge theory solutions include a nontrivial gauge field flux as well as normal deformations to the three-manifold captured by noncommuting matrix coordinates, a signal of T-brane phenomena. Solutions of the 3D gauge theory on a three-manifold are given by a deformation of the Hitchin system on a marked Riemann surface which is fibered over an interval. We present explicit examples of such backgrounds as well as the profile of the corresponding zero modes for localized chiral matter. We also provide a purely algebraic prescription for characterizing localized matter for such T-brane configurations. The geometric interpretation of this gauge theory description provides a generalization of twisted connected sums with codimension seven singularities at localized regions of the geometry. It also indicates that geometric codimension six singularities can sometimes support 4D chiral matter due to physical structure "hidden" in T-branes.
Ključne besede: Yang-Mills connections, spin(7), holonomy, bundles, metrics
Objavljeno v DKUM: 16.10.2023; Ogledov: 212; Prenosov: 12
.pdf Celotno besedilo (710,65 KB)
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5.
Effects of differential time and difficulty weighting on the improvement of OSCE quality metrics
Matic Mihevc, Klara Masnik, Tadej Petreski, Nejc Pulko, Sebastjan Bevc, 2022, izvirni znanstveni članek

Ključne besede: OSCE, clinical skills, peer assessment, quality metrics, weighting, outliers
Objavljeno v DKUM: 17.01.2023; Ogledov: 430; Prenosov: 45
.pdf Celotno besedilo (309,40 KB)
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6.
Quantitative model for economic analyses of information security investment in an enterprise information system
Rok Bojanc, Borka Jerman-Blažič, 2012, izvirni znanstveni članek

Opis: The paper presents a mathematical model for the optimal security-technology investment evaluation and decision-making processes based on the quantitative analysis of security risks and digital asset assessments in an enterprise. The model makes use of the quantitative analysis of different security measures that counteract individual risks by identifying the information system processes in an enterprise and the potential threats. The model comprises the target security levels for all identified business processes and the probability of a security accident together with the possible loss the enterprise may suffer. The selection of security technology is based on the efficiency of selected security measures. Economic metrics are applied for the efficiency assessment and comparative analysis of different protection technologies. Unlike the existing models for evaluation of the security investment, the proposed model allows direct comparison and quantitative assessment of different security measures. The model allows deep analyses and computations providing quantitative assessments of different options for investments, which translate into recommendations facilitating the selection of the best solution and the decision-making thereof. The model was tested using empirical examples with data from real business environment.
Ključne besede: modelling, security technology, economic metrics, investment, enterprise information system
Objavljeno v DKUM: 22.01.2018; Ogledov: 1170; Prenosov: 382
.pdf Celotno besedilo (2,18 MB)
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7.
Usage, Potentials and Challenges of Building Information Modelling (BIM) in Slovenia, Austria, Germany and Switzerland
Amanda Jus, 2017, magistrsko delo

Opis: In the master’s thesis, the main potentials, challenges and usage of Information Building Modelling (BIM) in Slovenia, Austria, Germany and Switzerland are presented, including its, because BIM is currently the most widely discussed topic in civil engineering. The study was based on a questionnaire that was carefully created at the HSLU (Hochschule Luzern) in Switzerland. We participated in the last phases of its development. With the help of the results of the questionnaire, we evaluated the current usage and acceptance of BIM among all participants in the building process.
Ključne besede: civil engineering, BIM, Building Information Modelling, BIM metrics
Objavljeno v DKUM: 25.09.2017; Ogledov: 2180; Prenosov: 238
.pdf Celotno besedilo (6,88 MB)
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8.
XML Schema metrics for quality evaluation
Maja Pušnik, Marjan Heričko, Zoran Budimac, Boštjan Šumak, 2014, izvirni znanstveni članek

Opis: In XML Schema development, the quality of XML Schemas is a crucial issue for further steps in the life cycle of an application, closely correlated with the structure of XML Schemas and different building blocks. Current research focuses on measuring complexity of XML Schemas and mainly do not consider other quality aspects. This paper proposes a novel quality measuring approach, based on existing software engineering metrics, additionally defining the quality aspects of XML Schemas using the following steps: (1) definition of six schema quality aspects, (2) adoption of 25 directly measurable XML Schema variables, (3) proposition of six composite metrics, applying 25 measured variables and (4) composite metrics validation. An experiment was conducted using 250 standard XML Schemas collected from available e-business information systems. The results illustrate the influence of XML Schemaʼs characteristics on its quality and evaluate the applicability of metrics in the measurement process, a useful tool for software developers while building or adopting XML Schemas.
Ključne besede: XML, metrics, quality variables, quality index, evaluation, validation
Objavljeno v DKUM: 06.07.2017; Ogledov: 1381; Prenosov: 406
.pdf Celotno besedilo (765,37 KB)
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9.
On automata and language based grammar metrics
Matej Črepinšek, Tomaž Kosar, Marjan Mernik, Julien Cervelle, Rémi Forax, Gilles Roussel, 2010, izvirni znanstveni članek

Opis: Grammar metrics have been introduced to measure the quality and the complexity of the formal grammars. The aim of this paper is to explore the meaning of these notions and to experiment, on several grammars of domain specific languages and of general-purpose languages, existing grammar metrics together with the new metrics that are based on grammar LR automaton and on the language recognized. We discuss the results of this experiment and focus on the comparison between grammars of domain specific languages as well as of general-purpose languages and on the evolution of the metrics between several versions of the same language.
Ključne besede: grammar metrics, software language engineering, grammar engineering, grammarware
Objavljeno v DKUM: 06.07.2017; Ogledov: 1497; Prenosov: 410
.pdf Celotno besedilo (282,41 KB)
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10.
A programming language independent framework for metrics-based software evolution and analysis
Črt Gerlec, Gordana Rakić, Zoran Budimac, Marjan Heričko, 2012, izvirni znanstveni članek

Opis: Knowledge about different aspects of software quality during software evolution can be valuable information for developers and project managers. It helps to reduce the number of defects and improves the internal structure of software. However, determining softwarećs quality and structure in heterogeneous systems is a difficult task. In this paper, a programming language independent framework for evaluating software metrics and analyzing software structure during software development and its evolution will be presented. The framework consists of the SMIILE tool for calculation of software metrics, extended with an analysis of software structure. The data are stored in a central repository via enriched Concrete Syntax Tree (eCST) for universal source code representation. The framework is demonstrated in a case study. The development of such a framework is a step forward to consistent support for software evolution by providing a change analysis and quality control. The significance of this consistency is growing today, when software projects are more complex, consisting of components developed in diverse programming languages.[Acknowledgments. Work of the second and third author is partially supported by the Serbian Ministry of Science and Technological Development through project no. OI174023 ĆIntelligent Techniquesand Their Integration into Wide-Spectrum Decision SupportĆ. Bilateral project between Slovenian Research Agency and Serbian Ministry of Science and Technological Development (Grant BI-SR/10-11-027) enabled the exchange of visits and ideas between authors of this paper and their institutions.]
Ključne besede: software evolution, software development, quality, structure, metrics
Objavljeno v DKUM: 06.07.2017; Ogledov: 2041; Prenosov: 372
.pdf Celotno besedilo (264,50 KB)
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