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Publikacije (46563)

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S. Koric, D. Abueidda

Abstract The paper explores the possibility of using the novel Deep Operator Networks (DeepONet) for forward analysis of numerically intensive and challenging multiphysics designs and optimizations of advanced materials and processes. As an important step towards that goal, DeepONet networks were devised and trained on GPUs to solve the Poisson equation (heat-conduction equation) with the spatially variable heat source and highly nonlinear stress distributions under plastic deformation with variable loads and material properties. Since DeepONet can learn the parametric solution of various phenomena and processes in science and engineering, it was found that a properly trained DeepONet can instantly and accurately inference thermal and mechanical solutions for new parametric inputs without re-training and transfer learning and several orders of magnitude faster than classical numerical methods.

Amra Gadžo, Sanel Halilbegović, Alma Osmanović Đaković, Adis Hodzic

Abstract Considering the burning problem of corruption and non-transparency of public enterprises in the Federation of Bosnia and Herzegovina (FBiH), the paper aims to investigate whether the Beneish M-score model can be used to predict inaccurate financial statements. Where, the cause of inaccurate financial statements are intentional or unintentional errors. On a sample of 200 financial statements of public enterprises and related audit reports issued by the Audit Office of the Institutions in FBiH, we made a link between the Beneish M score model with its partial indicators (DSRI, GMI, AQI, SGI, DEPI, SGAI, LVGI, TATA) and four types of opinions: positive, opinion with distraction, negative and refraining from giving opinions. The research was conducted using descriptive statistics and an artificial neural network with the “scaled conjugate gradient backpropagation (trainscg)” algorithm for pattern recognition and classification. The research results show that it is possible on the basis of 8 partial indicators (DSRI, GMI, AQI, SGI, DEPI, SGAI, LVGI, TATA) i.e. 24 balance sheet position for their calculation, predict the auditor’s opinion on the quality of financial statements of public companies with an accuracy ranging between 98 and 100% in repeated procedures. The results of the research have their practical usefulness and can serve to researchers, creditors, customers, suppliers and state auditors in planning resources and priorities for performing financial audits at public companies in the FBiH.

G. Sulejmanpasić, Amra Memić-Serdarević, Selma Šabanagić-Hajrić, Nermina Bajramagic

Background: The VEPs provide an objective measure of brain function, analyzing integrity of visual processing. With patients affected with schizophrenia, the changes with the implementation of VEP are evident, such as symmetrical deceleration of the impulse and the continuance of latency, which points to a degenerative illness, suggesting the presence of optical neuritis or hemianopsia conjoined with mentioned intracranial illness. Objective: The aim of the study was to determine the correlation of positive and negative symptoms (PANSS scores) and P100 latency between patients with schizophrenia and patients with migraine headache according to gender and age. Visual evoked potentials (VEPs) were applied. Methods: The sample included 80 subjects: a) S group- 40 patients with schizophrenia (21 males; 19 females); b) H group-40 healthy subjects with migraine headache (10 males; 30 females). The study was conducted at the Department of Psychiatry and Neurology University Clinical Center Sarajevo. Results: Our research revealed positive correlation of the P100 latency and the PANSS score of negative symptoms, which means that the subjects of the observed group with a higher latency of the P100 wave of the entire visual field in both eyes have higher PANSS scores of negative symptoms. The correlation is significantly higher in female subjects (37% shared variance) than in male subjects (12% shared variance). All male subjects have a PANSS negative symptoms score of 17 or higher, while all female subjects have a PANSS negative symptoms score of less than 17 positive correlations were registered in P100 latency in left view field of both eyes and in P100 amplitude in the region of right eye (p=0.01) in comparation with left eye region (p=0.05) in patients with schizophrenia. Conclusion: Results imply that the cognitive impairment seen in schizophrenia is not just due to deficits in higher order aspects of cognition but also encompasses significant deficits in early sensory processing. Our study is useful to initiate new questions and recommendations for further studies, specifically on changes in the occipital lobe in the schizophrenic patient’s brain.

M. Demić, Aleksandar Đurić, A. Grkić, Momir Drakulić, S. Muždeka

Motor vehicles are complex dynamic systems due to spatial vibratory displacements during movement, changes in the characteristics of components during life cycle, a large number of influences and disturbances, the occurrence of clearance, friction, hysteresis, etc. The mentioned dynamic phenomena, especially vibrations, cause fatigue of the driver and passengers, reduce the life cycle of the vehicle and its systems, etc. In the general case, the movement of motor vehicles is done on uneven roads (terrain) and curvilinear paths in flat roads (terrains). Oscillatory movements cause loading of vehicle parts, but they also negatively affect human health. Therefore, even in the design phase of the vehicle, special attention must be paid to the harmonization of the mutual movement of the vehicle subsystem, and in particular, the suspension system. Theoretical, experimental or combined methods can be used for this purpose, and it is very useful to have experimental results of vibration of the vehicle subsystems in real operational conditions. Therefore, it is very useful to have experimental results of vibration of vehicle subsystems in operational conditions. Bearing that in mind, the aim of this wpaper was to use the movement of FAP 1118, 4x4 wheel formula, in operational conditions (due to higher speeds - in road conditions) to define laboratory conditions for testing. This is made possible by registering and identifying statistical parameters of registered quantities.

Momir Drakulić, Lazar Stojnić, I. Blagojević, Aleksandar Đurić, S. Perić

The vehicle steering system is one of the most important systems on the vehicle, both in terms of safety and performance. Based on the geometry of the steering trapezoid, the geometry of the suspension system, the alignment angles of the wheels, as well as the characteristics of the tires, a mathematical model for the design of the formula student vehicle "Road Arrow" steering system was developed. Based on the dynamic state of the vehicle, the mathematical model provides information on the stress of the steering system, the torque on the steering wheel and the slip angles of the steered wheels. The mathematical model was developed using the MATLAB software, and validation of the results was performed by comparing the results with the ones obtained by simulations in MSC ADAMS. Analysing the obtained results, it is possible to conclude that the average value of relative error of the stress is approximately 15%, for slip angles of the steered wheels is approximately 7%, and the error for torque on the steering wheel is approximately 6%.

I. Salimović-Bešić, A. Dedeić-Ljubović, Edin Zahirović, Medina Hasanović, Merima Šehić, Maja Vukovikj, Golubinka Boshevska, S. Vegar-Zubović et al.

Circulation of the Omicron variant with the reemergence of the N501Y mutation along with many others in the spike protein has once again stirred the academic community. Interestingly, tracing the genetic diversity of SARS-CoV-2 shed light on a less frequent N501Y + Delta variant which has been in the global circulation for some time before the Omicron appearance. This paper aims to present the molecular characteristics of the SARS-CoV-2 Spike_N501Y + Delta variant detected in Bosnia and Herzegovina. The study was conducted during November and December 2021. All patients were tested using real-time RT-PCR for detection of SARS-CoV-2. A representative number of SARS-CoV-2 positive samples was pre-screened using VirSNiP SARS-CoV-2 Spike N501Y kit. The characterization of the viruses was carried out with Illumina RNA Prep with enrichment and the Respiratory Virus Oligo Panel kit. Among the analyzed sequences, we found two isolates of the Delta variant that differ from their most related clade- GK AY.4.3 in additional mutations N501Y and L54F. In this study, we described the presence of a rare form of Delta variant with Spike_N501Y mutation in the shadow of the Omicron emergence. Despite the set of mutations in the Spike protein, this form of Delta variant does not indicate the large-scale consequences for the general population. Further functional studies of this form could provide more information about its antigenicity and infectivity.

M. Pezer, M. Odak, Zeljko Marusic

The development of mobile health (mHealth) applications has revolutionized health and fitness management by providing users with innovative digital tools to monitor and improve their well-being. These apps integrate features such as step counting, health tracking, and activity monitoring, making them valuable for personalized health interventions. However, ensuring effective user engagement remains a critical challenge. Persuasive System Design (PSD) strategies are essential for influencing user behaviour, improving adherence to health interventions, and enhancing app usability. Despite extensive research on PSD strategies, a structured framework that prioritizes the most effective strategies for mHealth apps is lacking. This study aims to address this gap by utilizing the Fuzzy Analytic Hierarchy Process (Fuzzy AHP) to identify and rank the most influential PSD strategies for health and fitness mobile applications. By gathering expert opinions from product managers, this research will develop a structured Top 10 PSD Strategies Model that offers product designers a prioritized framework for implementing persuasive techniques. The findings will help improve user retention, engagement, and overall app success.

Z. Su, Barry L. Bentley, A. Cheshmehzangi, D. McDonnell, J. Ahmad, S. Šegalo, Hengcai Chen, C. D. da Veiga et al.

Violence against women is rampant in China. Even though meaningful strides have been made in the country, it remains disturbingly common for men to assault women-verbally or physically, who may or may not be their partners-in broad daylight in China. To make the situation worse, COVID-19, along with its restrictions, has both undermined women's ability to escape from abuse or violence and society's ability to provide timely help to victims. In light of the rising violence against women post-COVID, in this paper, we discuss the policy imperatives for countries like China to establish effective guardrails and support systems to protect women from the dehumanizing and destabilizing crime that is violence against women-a social malaise that not only harms and undermines the safety of society's daughters, mothers, and grandmothers, but also the integrity of local communities and social contract, let along shared humanity and global solidarity at large.

Dragan Smiljanić, S. Sremac, G. Stojić, Željko Stević

One important activity that is insufficiently researched in the field of supply chain for dangerous goods concerns the locations where vehicles carrying dangerous goods are parked. In the territory of Serbia, where the research was conducted, there are no prescribed locations of this type. This paper presents an example of selecting suitable parking locations for vehicles carrying dangerous goods along a road section of the highway network in the Republic of Serbia. For that purpose, the integrated MCDM model, consisting of the FUCOM and MARCOS methods, has been applied. FUCOM is used to determine the weighting coefficients, while the MARCOS method is used to rank locations. The results represent the selection of the most suitable locations in relation to the length of the observed section and the direction. Verification of the proposed model was performed through sensitivity and comparative analyses, and the calculation of correlation coefficients.

Jiaqi Li, C. Beghein, S. McLennan, A. Horleston, C. Charalambous, Quancheng Huang, G. Zenhäusern, E. Bozdağ et al.

The most distant marsquake recorded so far by the InSight seismometer occurred at an epicentral distance of 146.3 ± 6.9o, close to the western end of Valles Marineris. On the seismogram of this event, we have identified seismic wave precursors, i.e., underside reflections off a subsurface discontinuity halfway between the marsquake and the instrument, which directly constrain the crustal structure away (about 4100−4500 km) from the InSight landing site. Here we show that the Martian crust at the bounce point between the lander and the marsquake is characterized by a discontinuity at about 20 km depth, similar to the second (deeper) intra-crustal interface seen beneath the InSight landing site. We propose that this 20-km interface, first discovered beneath the lander, is not a local geological structure but likely a regional or global feature, and is consistent with a transition from porous to non-porous Martian crustal materials. The authors show that the Martian crust, ~4300 km from the InSight landing site, has a subsurface interface similar to that beneath the lander, suggesting it is a regional or global feature that may be related to the closure of pore spaces at depth.

Denis Mačkić, F. Čustović, E. Begić

BACKGROUND: Prosthetic mechanical valve endocarditis (PVE) can be manifested as early PVE (acquired perioperatively) and late PVE (resulting from infections unrelated to the valve operation). Causes of both are similar but are late PVE are more prone to less virulent microbes. PVE resulting with paravalvular abscess is confirmed through echocardiography (transthoracic or transesophageal), it results with a high mortality rate especially if it is not early recognized. The aim of article was to present a patient with heart failure symptoms caused by PVE. CASE PRESENTATION: Male patient, 44 years old, was admitted because of dyspnea and swelling of lower extremities. The patient is a long-standing heroin addict who had aortic valve replacement done 8 years ago due to endocarditis. The implanted valve was a mechanical aortic valve – Edwards MIRA bi-leaflet valve No 32 (Edwards Lifesciences; Irvine, California). He also was already diagnosed with hepatitis C years before. In multiple occasions were hospitalized on the Department of cardiology due to signs and symptoms of heart failure. On transthoracic echocardiography, dilatation of all heart chambers was found. The left ventricular systolic function was moderately reduced with an ejection fraction of left ventricle of 42% according to Simpson with restrictive filling pattern. Hypoechoic mass along the right side of the mechanical aortic valve was noted measuring 3.57 × 1.03 cm. CONCLUSION: Paravalvular abscess of mechanical heart valves is a very serious complication with a high mortality rate. It is essential to recognize this type of pathology as early as possible, so aggressive parenteral antibiotic therapy could be started, while in many cases, surgical reoperation is needed.

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