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Transport and Localization in Classical and Quantum Billiards
Črt Lozej, 2020, doktorska disertacija

Opis: In this thesis the classical and quantum dynamics in billiard systems are considered. Extensive numerical studies of the classical transport properties in several examples of billiard families including the ergodic Bunimovich stadium and cut-circle billiards and the mixed-type Robnik and lemon billiards are performed. The analysis of the transport is based on the random model of diffusion which assumes that due the strongly chaotic dynamics the motion of the orbit on the discretized phase space is temporally uncorrelated. The cause of the deviations from the random model dynamics is traced to dynamical trapping due to stickiness. A novel approach to locally quantifying stickiness based on the statistics of the recurrence times is presented and applied to distinguish between exponential decays of recurrence times and other types of decays. This enables the identification of sticky areas in the chaotic components. Detailed maps of their structure for a wide range of parameter values, mapping the evolution of the mixed-phase spaces and revealing some particularly interesting special examples are presented. The recurrence time distributions in sticky areas are found to be well described by a mixture of exponential decays. The transport of particle ensembles in the momentum space of classical billiards is described by using an inhomogeneous diffusion model and the classical transport times are determined. The classical transport times are vital for the analysis of the localization of chaotic eigenstates in quantum billiards. The control parameter that describes the the degree of localization of the chaotic quantum eigenstates is the ratio between the Heisenberg time (Planck's constant divided by the mean level spacing) and the classical transport time. Extensive numerical calculations of the high-lying spectra and eigenstates of the stadium, Robnik and lemon quantum billiards are performed. The spectral statistics are analysed in terms of the standard methods of quantum chaos. The level repulsion exponent of localized eigenstates is found to be a rational function of the control parameter. The degree of localization is determined with respect to localization measures based on the Poincaré-Husimi representation of the eigenstates. The mean localization measure is found to be a rational function of the control parameter and linearly related to the level repulsion exponent. The distributions of the localization measures are analysed and found to be of a universal shape well described by a two parameter empirical distribution in billiards with no apparent stickiness. The nonuniversal system specific features of localization measure distributions are related to the presence of sticky areas in the phase spaces of classical billiards with specific examples shown.
Ključne besede: Transport, localization, chaos, quantum chaos, Hamiltonian systems, level spacing distribution, mixed phase space, billiard, quantum billiard, Husimi functions, stickiness, cantorus, chaotic eigenstates, level repulsion.
Objavljeno: 13.01.2021; Ogledov: 276; Prenosov: 46
.pdf Celotno besedilo (24,93 MB)

Unlimited access to information systems with mobile devices
Igor Bernik, Blaž Markelj, 2011, pregledni znanstveni članek

Opis: Purpose: Mobile devices have become an indispensible part of modern communications; they enable easy access to the Internet and also remote manipulation of data stored in corporate information systems. The number of mobile device users is on the rise, but most of them don’t comprehend completely the less obvious functions of these devices. Users also have almost no control over background computer programs, because they run without their knowledge and volition. From the standpoint of information security, a lack of awareness of the risks can seriously compromise the integrity of corporate networks and information systems. The weakest links are users, but also the technology itself. To ensure the functioning and security of information systems, corporations and individual users should learn about protective mechanisms. It is also important that users adhere to implemented (internal) safety regulations. Design/Methods/Approach: We used descriptive and comparative methods, and made an overview of published literature, as well as processes pertaining to the use of mobile devices and related security issues. We compared general elements of information security in regard to the use of mobile devices. Findings: At present mobile devices are more and more frequently used to access information systems. The majority of users are concerned almost exclusively with the question, how to get uninterrupted remote access to data, but far less with security issues. This paper presents some guidelines for achieving and maintaining information security. Research limitations/implications: It has been noted, that this is a time of turbulent development and evolution in the field of mobile devices, and also related security issues, so best practices haven’t been defined yet. Corporations and other organizations have just recently begun defining guidelines to eliminate security breaches through mobile devices, therefore a comparison of their implemented solutions is practically impossible. VS_ Practical implications: We propose guidelines, which can be used to: minimize information security risks posed by mobile devices; evaluate the current state of information security; and implement protective measures against cyber threats encountered by corporations and individual users of mobile devices. Originality/Value: Information security is a relatively new field because mobile devices and remote access to the Internet and data have just recently come into wider use. At the same time security issues and protective measures have stayed largely overlooked. Security threats are many, so it is impervious that users learn more about them and adopt some necessary security measures.
Ključne besede: information security, blended threats, mobile devices, corporate information systems, business integrity
Objavljeno: 12.05.2020; Ogledov: 422; Prenosov: 22
.pdf Celotno besedilo (884,10 KB)
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International Conference Fluid Power 2019

Opis: The International Fluid Power Conference is a two day event, intended for all those professionally-involved with hydraulic or pneumatic power devices and for all those, wishing to be informed about the ‘state of the art’, new discoveries and innovations within the field of hydraulics and pneumatics. The gathering of experts at this conference in Maribor has been a tradition since 1995, and is organised by the Faculty of Mechanical Engineering at the University of Maribor, in Slovenia. Fluid Power conferences are organised every second year and cover those principal technical events within the field of fluid power technologies in Slovenia, and throughout this region of Europe. This year's conference is taking place on the 19th and 20th September in Maribor.
Ključne besede: fluid power technology, components and systems, control systems, fluids, maintenance and condition monitoring
Objavljeno: 24.02.2020; Ogledov: 303; Prenosov: 23
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Blockchain-Based digital identity management
Nejc Schneider, 2019, magistrsko delo

Opis: Centralized identity management systems are most commonly used. However, they pose certain threats to identity owners using them. Most of these problems revolve around users not being in control of their data. Self-sovereign identity seeks to aid this issue by putting the user in control. The research goal is to find out whether decentralized networks implementation in the domain of identity management can prove beneficial for the identity owners. This research addresses the following questions: • How is the user data managed on centralized servers and how can it be managed in a decentralized environment? • What are the blockchain features that could benefit the domain of digital identity management? • Can the blockchain-based solutions fulfill the requirements of SSI as well as GDPR regulations? • What new challenges do they bring and why has a massive adaptation of blockchain technology beyond the field of cryptocurrencies not yet occurred? Previous academic research and industry reports show the massive potential of Blockchain technology. However, there are only a few examples of how to implement this technology to overcome the barriers (Wadhwa, 2019). Blockchain offers immutability, which can be very valuable for certain purposes. However, it may not be an ideal solution for storing personal data. To offer a comprehensive solution, our use-case combines both centralized and decentralized data storage to protect the user data.
Ključne besede: blockchain, self-sovereign identity, management systems, identity data, Sovrin network.
Objavljeno: 25.11.2019; Ogledov: 498; Prenosov: 174
.pdf Celotno besedilo (1,03 MB)

Call recording with the help of the integration of systems Cisco Unified Communications Manager and Asterisk
Simon Ocvirk, 2019, diplomsko delo

Opis: At the beginning of the thesis, we present the integrating systems Cisco Unified Communications Manager and Asterisk, which will be used for call recording. We later introduce the development frameworks Laravel and Angular, with the help of which the Telephone Interface Communications Manager is built upon. We have researched the methods of encryption and decryption and how we would apply these for development of our own solution, which will prevent unauthorized managing with files. Finally, we analysed options for limiting access to files and developed an integrated solution for a secure recording and managing with call recordings.
Ključne besede: call recording, Asterisk, Cisco, Cisco Unified Communications Manager, integration of systems
Objavljeno: 08.11.2019; Ogledov: 504; Prenosov: 77
.pdf Celotno besedilo (3,04 MB)

Yield performance and agronomic efficiency in oil pumpkins (Cucurbita pepo L. group Pepo) depending on production systems and varieties
Manfred Jakop, Silva Grobelnik Mlakar, Martina Bavec, Martina Robačer, Tjaša Vukmanič, Urška Lisec, Franc Bavec, 2017, izvirni znanstveni članek

Opis: In 2013 and 2014, a long-term trial (which was established in 2007) was conducted at the University Agricultural Centre in Pivola near Hoče. It included different production systems (conventional, integrated, organic, biodynamic), carried out in a field trial with oil pumpkins. The aim of the research was to analyse the effects of different production systems, varieties (hybrid and population variety) and years of production, on formation of oil pumpkin yields. The agricultural practice has been carried out in accordance with the applicable legislations and standards for the individual production system. When sowing, before fertilizing with nitrogen in early June and after the harvest, the amount of soil mineral nitrogen was monitored. We evaluated the number and weight of harvestable, unripe and decayed fruits, and yield of oil seed pumpkins and calculated the agronomic efficiency of the applied nutrients. The results showed that the year of production, the production system and the variety have a significant effect on some fruit characteristics and the yield of oil pumpkin seeds. The content of soil mineral nitrogen in May and September was significantly influenced by the production system and the year. In June, only the production system had a significant effect. The hybrid significantly increased the yields of oil pumpkin seeds in all production systems, even in the year that was less suitable for production. The agronomic efficiency of the applied nutrients in the biodynamic and organic production system is higher or equal than in the conventional production system, similarly, agronomic efficiency is higher in the hybrid compared to the oldest population variety efficiently. A comparable oil pumpkin yield can be expected in biodynamic and organic production, when proper nutrition and well carried out cultivation practices are combined with a new variety, when compared to less sustainable production systems, which often cause damage to the environment.
Ključne besede: production systems, variety, oil pumkins, mineral nitrogen, agronomic efficiency, yield
Objavljeno: 10.10.2018; Ogledov: 1053; Prenosov: 258
.pdf Celotno besedilo (290,91 KB)
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Corporate governance and corporate social responsibility synergies
Jelena Nikolić, Dejana Zlatanović, 2018, izvirni znanstveni članek

Opis: Respecting the importance of corporate governance (CG), particularly various corporate governance mechanisms for improving corporate social responsibility (CSR) activities, the paper highlights relevant CG–CSR synergies from the perspective of systems thinking. The paper further aims to demonstrate the ways in which selected systems methodologies can support CG–CSR synergies. Accordingly, we selected appropriate systems methodologies, such as dialectical systems theory, soft systems methodology, and system dynamics. We defined the dialectical system, consisting of essential corporate governance mechanisms, which contribute to CSR; we also identified the key stakeholders and their perceptions of CG–CSR relations through CATWOE analysis; thus, the appropriate root definition and conceptual model, including the activities that are relevant for CG–CSR relations, were developed. Developed systemic framework provided a relevant methodological support to highlight the various issues of corporate governance, such as institutional framework, market for corporate control, ownership structure, board structure, and their contribution to CSR.
Ključne besede: corporate governance, corporate social responsibility, CG–CSR synergies, systemic approach, combined use of selected systems methodologies
Objavljeno: 10.10.2018; Ogledov: 614; Prenosov: 71
.pdf Celotno besedilo (1,14 MB)
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Systems methodology for strategic decision-making in complex healthcare system
Tadeja Jere Lazanski, 2017, izvirni znanstveni članek

Opis: Systems methodology as a support for strategic decision- making will be discussed in the paper. A society will be presented as a complex system, which is comprised of many smaller, complex systems as its component parts. The healthcare system is one of them. The support to the strategic decision-making in a healthcare system will be shown through systems thinking and systems modelling. We will develop models of a healthcare system in frame of a systems dynamics; a qualitative causal loop diagram (CLD), which helps us to discuss the challenges categorically and a quantitative model, which is a simulation model. Both models illustrate the discussed methodology.
Ključne besede: systems methodology, healthcare system, strategic decision-making, systems thinking, modelling
Objavljeno: 09.10.2018; Ogledov: 620; Prenosov: 51
.pdf Celotno besedilo (783,10 KB)
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Inoculation of safety in healthcare
Bojan Dobovšek, Boštjan Slak, 2017, pregledni znanstveni članek

Opis: The purpose of this paper is to analyse - through a prism of informal institutions - the role and importance of security in healthcare and the manner in which healthcare sector copes with security threats in postmodern society. We note that bad informal institutions are differently reflected in Slovenia. In the forefront are the problems of systemic corruption, various forms of clientelism and nepotism. This is (in)directly reflected in the (lack of) quality of Slovenian healthcare system. Inadequate public procurement system and conflicts of interest in healthcare sector are causing inferior quality of the healthcare system, while informal institutions in politics and economics are weakening Slovenian economy, consequently affecting the funding of Slovenian healthcare system which is also undermined by the financial crisis. Additionally, globalisation, which has a (negative) impact on human health, has caused the importation of improper business practices into healthcare system. It is therefore necessary to develop a preventive action that will inoculate the idea of a safe country for the benefit of people and not for the benefit of bad informal networks.
Ključne besede: informal institutions, corruption, health systems, security
Objavljeno: 09.10.2018; Ogledov: 528; Prenosov: 71
.pdf Celotno besedilo (566,97 KB)
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