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3D coupled electromagneticthermal analysis of a hybrid electromagnetic system with magnetic flux modulation
Ivan Hadzhiev, Iosko Balabozov, Vultchan Gueorgiev, Ivan Yatchev, 2021, original scientific article

Abstract: This paper presents a study of the electromagnetic and thermal field of a new construction of a hybrid electromagnetic system with magnetic flux modulation. The numerical studies were realised using the finite element method. The coupled problem electromagnetic field-electric circuit-thermal field was solved. A computer model of the hybrid electromagnetic system was developed for the purpose of the study using the software programme COMSOL. Results for the distribution of the electromagnetic and thermal field in the hybrid electromagnetic system with magnetic modulation were obtained at different supply voltages.
Keywords: Coupled problems, finite element analysis, hybrid electromagnetic system, magnetic flux modulation, permanent magnets
Published in DKUM: 13.11.2023; Views: 119; Downloads: 3
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Anxiety and Alcohol Consumption in Young Adults: The Moderating Role of Gender and The Mediating Roles of Avoidant Coping and Satisfaction with Life
Monika Ficjan, 2021, master's thesis

Abstract: Young adults are individuals facing responsibilities, privileges, opportunities, and important developmental changes that accompany the period of emerging adulthood. Increases in various mood changes, anxiety and depression symptoms, widespread use of coping strategies, increased alcohol consumption and alcohol related problems are not uncommon during this time. The main aim of the current study was to examine the relationship between anxiety and alcohol consumption among young adults. Additionally, the effect of gender as a moderator, and avoidant coping and satisfaction with life as mediators, was tested and analysed. The participants were a part of a large national study of young people’s mental health in Ireland (My World Survey 2). The final sample included 5859 young adults aged 18 to 25 years, 71,2% of whom were females. The measures used in the current study were Alcohol Use Disorders Identification Test, Anxiety Subscale in the Depression, Anxiety and Stress Scale, Avoidant Coping Subscale in the Adapted Coping Strategy Indicator and the Satisfaction with Life Scale. The results indicated that anxiety significantly predicted alcohol consumption, however, explained only 0,9 % of the total variance. The gender moderation analysis indicated that gender was a significant moderator in the relationship between anxiety and alcohol consumption. While the results notably indicated that increases in anxiety led to higher alcohol consumption in both males and females, the association was significantly stronger for the former. Further, avoidant coping was found to mediate the relationship between anxiety and alcohol use. Young adults that experienced higher anxiety symptoms were more likely to use avoidant coping strategies, which in turn led to higher alcohol consumption. Satisfaction with life did not mediate the relationship between anxiety and alcohol consumption. As such, the current study offers additional insights on the relationship between anxiety and alcohol consumption among young adults.
Keywords: young adults, alcohol consumption, alcohol-related problems, anxiety, avoidant coping, satisfaction with life
Published in DKUM: 31.05.2021; Views: 961; Downloads: 86
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Effectiveness of proactive password checker based on Markov models : doktorska disertacija
Viktor Taneski, 2019, doctoral dissertation

Abstract: In this doctoral dissertation we focus on the most common method of authentication, the username-password combination. The reason for the frequent use of this authentication mechanism is its simplicity and low cost of implementation. Although passwords are so useful, they have many problems. Morris and Thompson, for the first time almost four decades ago, found that textual passwords were a weak security point of information systems. They have come to the conclusion that users are one of the biggest threats to information system’s security. Since then, we face these problems on a daily basis. Users do not perform the behaviours they need to be done in order to stay safe and secure, although they are aware of the security issues. Because this is a research area that security experts have been dealing with for a long time, in this dissertation we wanted to identify problems related to textual passwords and possible suggested solutions. For this purpose, we first performed a systematic literature review on textual passwords and their security. In doing so, we wanted to evaluate the current status of passwords in terms of their strength, ways of managing passwords, and whether users are still the “weakest link”. We found that one of the less researched solutions is proactive password checking. A proactive password checker could filter out the passwords that are easy-to-guess and only let through the passwords that are harder to guess. In order for a proactive password checking to be more effective, it is necessary for the checker to be able to check the probability that a certain password will be selected by the user. For this purpose, the better password checkers usually use certain tools to calculate password probability i.e., password strength. To find out which method is most suitable for calculating password strength, we have looked at similar solutions throughout history. We have found that Markov models are one of the most common methods used for password strength estimation, although we may encounter some problems when using them, such as sparsity and over-fitting. By reviewing similar solutions, we found that Markov models are mostly trained on only one dataset. This could limit the performance of the model in terms of correctly identifying bad or very strong passwords. As training datasets are important in the development of Markov models, it is clear that they will have some effect in the final assessment of the password’s strength. What we explore in our dissertation, is the importance of this effect on the final password strength estimation. Mainly, we focus on exploring the effect of different but similar datasets on password strength estimation. For the purposes of our study, we analysed publicly available sets of “common passwords” and processed them regarding the frequency distribution of the letters contained in these passwords. We built different Markov models based on these datasets and frequency distribution. This helped us determine if one Markov model was sufficient or if several models were needed to effectively estimate password strength for a wide range of passwords. The results showed statistical differences between the models. In more detail, we found that: - different Markov models (trained on different databases) showed statistically different results when tested on the same dataset, - more diverse datasets are needed to be able to calculate the strength of as many passwords as possible, since one “universal” model, trained on one “universal” dataset is less effective at classifying passwords in different categories (i.e., weak, medium, strong), - different Markov models of 1st and 2nd order, in most cases, give no statistically different outputs, - overall, Markov models can be used as a basis for constructing a more effective password checker that uses multiple different and specific Markov models, which could be more effective if we want to cover a wider range of passwords.
Keywords: passwords, password analysis, password security, password problems, password strength, systematic literature review, Markov models
Published in DKUM: 13.01.2020; Views: 1427; Downloads: 225
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Blind alleys in variable type explanations of the downfall of the former Yugoslavia
Sergej Flere, 2002, original scientific article

Abstract: In this paper certain attractive explanations, present in sociological and other scholarship, on the dismemberment of Yugoslavia are considered, by reviewing them in light of certain thus far unpublished survey and census data on the former Yugoslavia, immediately preceding the dismemberment. Particularly one influential, but biased explanation of the dissolution of the former Yugoslavia is considered. Books by the sociologist Stjepan Meštrović merit particular attention in the depiction of bias towards the Yugoslav break-up. It is refuted that there was an in-depth incompatibility based on authoritarianism of any nationality, on emotional instability of any nationality, of ethnic stratification, of ethnic distance among the basic groups, which may explain the break-up. Instead, it is proposed that the break-up be explained by a maturation of nationalities, where the former Yugoslavia served as a nation-building institution, but for numerous nationalities.
Keywords: Yugoslavia, sociology, authoritarianism, dissolution, ethnic problems, cultural incompatibility
Published in DKUM: 12.10.2017; Views: 854; Downloads: 99
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Specific behavioural phenotype and secondary cognitive decline as a result of an 8.6 Mb deletion of 2q32.2q33.1
Hojka Gregorič Kumperščak, Danijela Krgović, Nadja Kokalj-Vokač, 2016, original scientific article

Abstract: Chromosomal abnormalities involving 2q32q33 deletions are very rare and present with a specific phenotype. This case report describes a 37-year-old female patient with 2q32q33 microdeletion syndrome presenting with the characteristic features, but with the addition of secondary cognitive decline. Molecular karyotyping was performed on the patient and her parents. It revealed an 8.6 megabase deletion with the proximal breakpoint in the chromosome band 2q32.2 and the distal breakpoint in 2q33.1. The deletion encompassed 22 known genes, including the GLS, MYO1B, TMEFF2, PGAP1 and SATB2 genes. The observed deletion was confirmed using a paralogue ratio test. This case report provides further evidence that the SATB2 gene, together with GLS, MYO1B, TMEFF2 and possibly PGAP1, is a crucial gene in 2q32q33 microdeletion syndrome. The SATB2 gene seems to be crucial for the behavioural problems noted in our case, but deletion of the GLS, MYO1B and TMEFF2 genes presumably contributed to the more complex behavioural characteristics observed. Our patient is also, to our knowledge, the only patient with 2q32q33 microdeletion syndrome with secondary cognitive decline.
Keywords: 2q32q33 microdeletion syndrome, behavioural problems, secondary cognitive decline, developmental delay, SATB2 gene
Published in DKUM: 13.07.2017; Views: 1150; Downloads: 355
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Some basic difference equations of Schrodinger boundary value problems
Andreas Ruffing, Maria Meiler, Andrea Bruder, 2009, original scientific article

Abstract: We consider special basic difference equations which are related to discretizations of Schrödinger equations on time scales with special symmetry properties, namely, so-called basic discrete grids. These grids are of an adaptive grid type. Solving the boundary value problem of suitable Schrödinger equations on these grids leads to completely new and unexpected analytic properties of the underlying function spaces. Some of them are presented in this work.
Keywords: differential equations, discretization, Schrödinger equations, value problems
Published in DKUM: 26.06.2017; Views: 1153; Downloads: 394
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Monte Carlo simulation-based approach to optimal bus stops allocation in the Municipality of Laško
Dejan Dragan, Tomaž Kramberger, Martin Lipičnik, 2011, original scientific article

Abstract: The paper addresses the problem of optimal bus stop allocation. The aim is to achieve reduction of costs on account of appropriate re-design of the process of obligatory transportation of children from their homes to the corresponding schools in the Laško municipality. The proposed algorithm relies on optimization based on the Monte Carlo simulation procedure. The number of calculated bus stops is required to be minimal possible, which can still assure maximal service area within the prescribed radius, while keeping the minimal walking distances pupils have to go across from their homes to the nearest bus stop and vice versa. The main issues of the proposed algorithm are emphasised and the working mechanism is explained. The presentation of calculated results is given and comparison with some other existing algorithms is provided. The positions of the calculated bus stops are going to be used for the purpose of physical bus stops implementation in order to decrease the current transportation costs.
Keywords: location problems, maximal covering problems, optimization, Monte Carlo simulation
Published in DKUM: 05.06.2017; Views: 1169; Downloads: 364
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The role of the psychosocial dimension in the improvement of quality of care : a systematic review
Irena Makivić, Janko Kersnik, Zalika Klemenc-Ketiš, 2016, review article

Abstract: The aim of our systematic review was to analyse the published literature on the psychosocial dimension of care in family medicine and its relationship with quality of care. We wanted to find out whether there is any evidence on the psychosocial approach in (family) medicine. The recommended bio-psycho-social approach, besides the biomedical model of illness, takes into account several co-influencing psychological, sociological and existential factors. An online search of nine different databases used Boolean operators and the following selection criteria: the paper contained information on the holistic approach, quality indicators, family medicine, patient-centred care and/or the bio-psycho-social model of treatment. We retrieved 743 papers, of which 36 fulfilled our inclusion criteria. Including the psychosocial dimension in patient management has been found to be useful in the prevention and treatment of physical and psychiatric illness, resulting in improved social functioning and patient satisfaction, reduced health care disparities, and reduced annual medical care charges. The themes of patient-centred, behavioural or psychosocial medicine were quite well presented in several papers. We could not find any conclusive evidence of the impact of a holistic biopsycho-social-approach. Weak and variable definitions of psychosocial dimensions, a low number of welldesigned intervention studies, and low numbers of included patients limited our conclusions.
Keywords: general practice, social problems, psychosocial care, quality of health care, reviews
Published in DKUM: 05.04.2017; Views: 957; Downloads: 168
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Detection of mutations in the CYP21A2 gene : genotype-phenotype correlation in Slovenian couples with conceiving problems
Špela Stangler Herodež, Lusien Fijavž, Boris Zagradišnik, Nadja Kokalj-Vokač, 2015, original scientific article

Abstract: The objective of this study was to compare the CYP 21A2 genetic profiles of couples with unexplained fertility problems (UFP) with genetic profiles of healthy controls (HCs). Furthermore, we analyzed associations between mutations in the CYP21A2 gene and various clinical and laboratory parameters. Allele-specific polymerase chain reaction (PCR) was used in 638 probands with UFP and 200 HCs. Statistic analysis with χ2 was used to study the association of mutations with infertility. The effect of mutations on particular clinical and laboratory parameters was assessed with the analysis of variance (ANOVA) test. With regard to the CYP21A2 gene, 0.6% of probands with UFP and 0.5% of HCs were positive for the c.290-13A/C>G mutation; 0.6% of probands with UFP and 1.5% of HCs were positive for the p.I172N mutation; there were no probands with UFP positive for the p.P30L mutation, whereas 0.5% of HCs were; and 0.2% of probands with UFP and 0.5% of HCs were found to have the p.V281L mutation. We found a significant association between c.290-13A/C>G mutation and the frequency of significant hormone deviations (χ2 = 6.997, p = 0.008). Similar association was also observed between the c.29013A/C>G mutation and the frequency of polycystic ovary syndrome (PCOS) (χ2 = 16.775, p = 0.000). Our findings indicate that no significant difference in the prevalence of CYP 21A2 mutations can be found in probands with UFP when compared with HCs without infertility history. The results also imply the significant association of the c.290-13A/ C>G mutation in the CYP21A2 gene, not only with the frequency of PCOS, but also with the frequency of significant hormone deviations.
Keywords: CYP21A2 gene, genetics, infertility, mutations, unexplained infertility problems (UFP), healthy controls (HCs)
Published in DKUM: 30.03.2017; Views: 1200; Downloads: 167
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Simultaneous embeddings of graphs as median and antimedian subgraphs
Kannan Balakrishnan, Boštjan Brešar, Manoj Changat, Sandi Klavžar, Matjaž Kovše, Ajitha R. Subhamathi, 2010, original scientific article

Abstract: Razdalja ▫$D_G(v)$▫ vozlišča ▫$v$▫ v grafu ▫$G$▫ je vsota razdalj med ▫$v$▫ in vsemi drugimi vozlišči grafa ▫$G$▫. Množica vozlišč grafa ▫$G$▫ z maksimalno (minimalno) razdaljo je antimedianska (medianska) množica grafa ▫$G$▫. Dokazano je, da za poljubna grafa ▫$G$▫ in ▫$J$▫ ter za poljubno naravno število ▫$r ge 2$▫ obstaja povezani graf ▫$H$▫, tako da je ▫$G$▫ antimedianski in ▫$J$▫ medianski podgraf grafa ▫$H$▫ ter da pri tem velja ▫$d_H(G,J) = r$▫. V primeru, ko sta oba ▫$G$▫ in ▫$J$▫ povezana, lahko dodatno naredimo, da sta ▫$G$▫ in ▫$J$▫ konveksna podgrafa v ▫$H$▫.
Keywords: matematika, teorija grafov, problemi razmeščanja, medianske množice, antimedianske množice, konveksni podgrafi, mathematics, graph theory, facility location problems, median sets, antimedian sets, convex subgraphs
Published in DKUM: 10.07.2015; Views: 1003; Downloads: 98
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