University Library, Kragujevac

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The University Library in Kragujevac is a library of a generally scientific character, and its activity has the function of teaching, scientific and researching processes at the University. This is how it contributes to successful studying, spreading and affirmation of knowledge, teaching and scientific advanced training and creative work of professors and researchers on faculties and institutes of the University in Kragujevac.

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The University Library, as part of its main activity, accomplishes a series of accompanying programs (scientific, literary and cultural, teaching and educational, vocational and publishing). The Library has its own publishing activity and publishes Bibliography of papers of professors and researchers of the University, as well as Bibliography of doctoral dissertations and master theses defended at University of Kragujevac.

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A 55-64-GHz Fully Integrated Miniaturized FMCW Radar Sensor Module for Short-Range Applications
(2019) Milosavljević, Ivan; Glavonjic D.; Krcum D.; Jovanovic G.; Mihajlović V.; Milovanović, Vladimir
© 2001-2012 IEEE. A compact wide-bandwidth frequency-modulated continuous-wave (FMCW) radar sensor module with integrated antennas intended for operation in the unlicensed 60-GHz band is presented. The proposed FMCW transceiver chip is at the heart of the radar module and it incorporates a frequency synthesizer and the analog baseband circuitry. The mm-wave radar sensor achieves sub-2-cm spatial resolutions and enables cutting-edge modulation rates higher than 200~\text {MHz/}\mu \text{s}. Steep frequency slopes are particularly important in the detection of close proximity targets that are below 20-cm range. The FMCW radar sensor prototype chip is implemented in 0.13- \mu \text{m} SiGe BiCMOS technology. It delivers more than +17.5 dBm of effective isotropic radiated power at the output over the complete frequency range of interest while dissipating 690 mW. The module is packed into 32\,\,\text {mm} \times 22\,\,\text {mm} \times 7\,\,\text {mm} aluminum case and covered by plastic lid.
A case study of industrial water polluted with chromium (VI) and its impact to river recipient in Western Serbia
(2010) Cvijovic, Mirjana R.; Djurdjevic, Predrag; Cvetkovic O.; CRETESCU, Igor
In this work the method for the treatment of industrial waste waters effluents containing hexavalent chromium in three companies during process of treating metal surface with chromic acid is described. Industrial water polluted with hexavalent chromium is collected in separate sewage system. Polluted water is collected in precipitation tanks which are directly connected with neutralization reservoirs. The treatment process includes pre-neutralization by lime-milk, sedimentation, flocculation, ion exchange and final neutralization of purified water before its final delivery to river flow. The samples from two river recipient of industrial water have been collected and analyzed. The impact on pollution of these eco systems was evaluated. The toxicity effect of hexavalent chromium on people health was discussed.
A cloud computing model for achieving competitiveness of domestic enterprises
(2020) Dordevic D.; Ćoćkalo, Dragan; Bakator M.; Bogetic S.; Vorkapic M.; Bešić C.
© The Editor(s) (if applicable) and The Author(s), under exclusive license to Springer Nature Switzerland AG 2020. Amidst the globalization of markets and within the framework of the fourth industrial revolution - Industry 4.0, domestic enterprises face challenges when it comes to business and market performance. Domestic enterprises lack necessary productivity and product quality in order to compete on the global market. In this paper cloud computing solutions in various industries are analyzed. The goal is to develop a cloud computing model for improving the competitive ability of domestic enterprises. The model integrates several cloud-based solutions and takes into consideration the business metrics of domestic enterprises. Furthermore, future trends in cloud computing advances and its application are discussed. The paper also presents suggestions and guidelines for improving competitiveness of domestic enterprises through the application of cloud computing solutions. The results of this study significantly contribute to the existing body of literature and provide a solid basis for future research in the domain of cloud computing application in industries in developing countries.
A deuterium-palladium electrode as a new sensor in non-aqueous solutions: Potentiometric titration of weak acids in acetonitrile and benzonitrile
(2010) Pantic, Igor; Mihajlović R.; Mihajlović L.
A deuterium-palladium electrode was employed as a new indicator electrode for the titration of weak acids in acetonitrile and benzonitrile. The investigated electrode showed a linear dynamic response for p-toluenesulfonic acid in the concentration range from 0.001 M to 0.1 M with a Nernstian slope of 48 mV in acetonitrile. Sodium methylate, potassium hydroxide and tetrabutylammonium hydroxide proved to be very suitable titrating agents for these titrations. The response time was less than 10-11 s and the lifetime of the electrode was limitless. Advantages of the electrode are: long-term stability, fast response, reproducibility, easy preparation and low cost. © 2010 Institute of Chemistry, Slovak Academy of Sciences.
A deuterium-palladium electrode as a new sensor in non-aqueous solutions: Potentiometric titration of weak acids in N,N-dimethylformamide and N-methylpyrrolidone
(2010) Mihajlović L.; Mandić, Snežana; Pantic, Igor; Mihajlović R.
A deuterium-palladium electrode was employed as a new indicator electrode for the titration of weak acids in N,N-dimethylformamide and methylpyrrolidone. The investigated electrode showed a linear dynamic response for p-toluenesulfonic acid in the concentration range from 0.1 to 0.001 M, with a nernstian slope of 78.0 mV in N,N-dimethylformamide and of 64 mV per decade in N-methylpyrrolidone. Sodium methylate, potassium hydroxide, and tetrabutylammonium hydroxide proved to be very suitable titrating agents for these titrations. The potential in the course of the titration and at the titration end point was rapidly established. The response time was less than 10-11 s, and the lifetime of the electrode is long. The experimental results obtained for the proposed electrochemical sensor and a conventional glass electrode were in good agreement. The advantages of the electrode are log-term stability, fast response, reproducibility, and easy preparation. © 2009 Springer-Verlag.
A fast method for the analysis of municipal solid waste in developing countries - Case study of Serbia
(2010) Vujić G.; Jovicic, Nemanja; Redžić N.; Jovicic G.; Batinic B.; Stanisavljević N.; Abuhress O.
This study aimed to develop a methodology for fast analysis of municipal solid waste applicable in developing countries. For this purpose, a case-study of quantification and morphological municipal solid waste analysis in ten Serbian municipalities with diverse socio-economic status was conducted from July 2008 to May 2009. The methodology was based on collating quantitative and qualitative data directly from the field and represents the first reliable information on the municipal waste characteristics at the national level. Random household solid waste samples were collected for morphological analysis, done manually, whilst for quantitative evaluation, MSW was collected and weighed over a seven-day period in three different seasons. Data analysis showed that the quantity of generated waste varies from 0.28 kg capita-1 day -1 to 1.54 kg capita-1 day-1, following the average income of the municipality under study. By extrapolation, Serbia annually produces over two million tonnes of municipal waste. Morphological composition analysis shows that organic waste represent 49.76% of the total mass quantity. It is followed by plastics and cardboard with their sub-categories (12% and 8% respectively); glass (5.44%), paper (5.34%) etc. This methodology is applicable to any region with under-developed waste management systems and the results are valuable starting point for developing waste management strategies as well as for creating laws and regulations in this field.
A fuzzy approach to evaluation and management of therapeutic procedure in diabetes mellitus treatment
(2010) Tadić, Danijela; Popovic P.; Dukić A.
In this paper a new fuzzy model (FMOTPD2) is developed and by this model the measures of beliefs are determined so that one of the groups of possible therapeutic procedures is optimal for each patient of type 2 diabetes on hospital treatment. The choice of therapeutic procedure on individual level, which is one of the demands of modern medicine, means that each therapeutic procedure is to be evaluated by multiple and different criteria. In this paper, evaluation criteria are classified into two groups: (1) common criteria by which medicines used by the type 2 diabetes patients are being evaluated and (2) specific criteria, by which the patients' 1h state of health with type 2 diabetes mellitus is being estimated. Generally, the relative importance and values of these criteria are different. It is assumed that (a) the relative importance of evaluation criteria is defined by a team of medical experts and described by linguistic expressions and (b) the values of evaluation criteria are determined by evidence data, anamnesis and a diagnostic process. They can be crisp or uncertain. The most often used linguistic expressions describing the relative importance of evaluation criteria are modeled by triangular fuzzy numbers. The rest of uncertainties, which exist in developed model are described by discrete fuzzy numbers. A new algorithm for determining a unified fuzzy portrait of treated therapeutic procedures for each patient is given. It enables calculation of the measures of beliefs that some therapeutic procedures are more optimal than the others. The developed model is illustrated by examples with real word data collected in a hospital.
A highly linear and fully-integrated FMCW synthesizer for 60 GHz radar applications with 7 GHz bandwidth
(2017) Milosavljević, Ivan; Glavonjić Ɖ.; Krcum, Dusan; Saranovac, Lazar; Milovanović, Vesna
© 2016, Springer Science+Business Media New York. A highly linear and fully-integrated frequency-modulated continuous-wave (FMCW) generator based on a fractional-N phase-locked loop (PLL) that is able to synthesize modulation schemes in 57–64 GHz range is proposed in this paper. The fractional-N PLL employs Colpitts voltage-controlled oscillator (VCO) at 60 GHz with 13.5% tuning range. Automatic amplitude and frequency calibrations are implemented to avoid drifts due to process, voltage and temperature variations and to set the center frequency of the VCO. Five-stage multi-modulus divider is used for division ratio switching, controlled by the sigma-delta (Σ Δ) modulator MASH 1-1-1. The frequency sweep (chirp) bandwidth and duration are fully programmable via serial peripheral interface allowing up to 16 different chirps in complex modulation scheme. The PLL reference signal is 250 MHz provided by external low-noise signal generator which is also used for digital modules clock. The overall PLL phase noise is lower than −80 dBc/Hz at 10 kHz offset and the chirp linearity is better than 0.01%. The complete FMCW synthesizer is implemented and verified as a stand-alone chip in a commercially available SiGe HBT 130 nm BiCMOS technology. The total chip area is 2.04mm2, and the total power consumption is 280 mW.
A model of gear transmission: Fractional order system dynamics
(2010) Hedrih K.; Nikoli-Stanojevi V.
A theoretical model of multistep gear transmission dynamics is presented. This model is based on the assumption that the connection between the teeth of the gears is with properties within the range from ideal clasic to viscoelastic so that a new model of connection between the teeth was expressed by means of derivative of fractional order. For this model a two-step gear transmision with three degrees of freedom of motion has been used. The obtained solutions are in the analytic form of the expansion according to time. As boundary cases this model gives results for the case of ideally elastic connection of the gear teeth and for the case of viscoelastic connection of the gear teeth, as well. Eigen fractional modes are obtained and a vizualization is done. © 2010 K. S. Hedrih and V. Nikoliá-Stanojeviá.
A note on Stone's, Baire's, Ky Fan's and Dugundji's theorem in tvs-cone metric spaces
(2011) Simi V.
Recently, Ayse Sonmez [A. Sonmez, On paracompactness in cone metric spaces, Appl. Math. Lett. 23 (2010) 494497] proved that a cone metric space is paracompact when the underlying cone is normal. Also, very recently, Kieu Phuong Chi and Tran Van An [K.P. Chi, T. Van An, Dugundji's theorem for cone metric spaces, Appl. Math. Lett. (2010) doi:10.1016/j.aml.2010.10.034] proved Dugundji's extension theorem for the normal cone metric space. The aim of this paper is to prove this in the frame of the tvs-cone spaces in which the cone does not need to be normal. Examples are given to illustrate the results. © 2011 Elsevier Ltd. All rights reserved.
A polynomial characterization of hypergraphs using the Ihara zeta function
(2011) Ren P.; Aleksic D.; Wilson R.; Hancock, Edwin
The aim of this paper is to seek a compact characterization of irregular unweighted hypergraphs for the purposes of clustering. To this end, we develop a polynomial characterization for hypergraphs based on the Ihara zeta function. We investigate the flexibility of the polynomial coefficients for learning relational structures with different relational orders. Furthermore, we develop an efficient method for computing the coefficient set. Our representation for hypergraphs takes into account not only the vertex connections but also the hyperedge cardinalities, and thus can distinguish different relational orders, which is prone to ambiguity if the hypergraph Laplacian is used. In our experimental evaluation, we demonstrate the effectiveness of the proposed characterization for clustering irregular unweighted hypergraphs and its advantages over the spectral characterization of the hypergraph Laplacian. © 2010 Elsevier Ltd. All rights reserved.
A Propositional Metric Logic with Fixed Finite Ranges
(2020) Djordjević Radosav; Ikodinović N.; Stojanović, Nenad
© 2020 - IOS Press and the authors. All rights reserved. The aim of this article is developing a formal system suitable for reasoning about the distance between propositional formulas. We introduce and study a formal language which is the extension of the classical propositional language obtained by adding new binary operators D≤s and D≥s, s Range, where Range is a fixed finite set. In our language it is allowed to make formulas of the form D≤s(α β) with the intended meaning 'distance between formulas α and β is less than or equal to s'. The semantics of the proposed language consists of possible worlds with a distance function defined between sets of worlds.
A SiGe Highly Integrated FMCW Transmitter Module with a 59.5-70.5-GHz Single Sweep Cover
(2018) Milosavljević, Ivan; Krcum D.; Glavonjic D.; Jovanovic I.; Mihajlović V.; Tasovac D.; Milovanović, Vladimir
© 1963-2012 IEEE. A fully integrated wide-bandwidth transmitter (TX) module intended for use in short-range frequency-modulated continuous-wave radar applications is proposed. By incorporating an on-chip fractional-N phase-locked loop based on the fundamental voltage-controlled oscillator, the TX is able to synthesize highly programmable 11-GHz linear chirps around the 65-GHz central frequency, hence theoretically enabling sub-1.5-cm spatial resolutions. Implemented in a 0.13-μm BiCMOS process, the test-chip delivers more than +5 dBm of output power and achieves the measured root-mean-square ramp error (nonlinearity) of 340 kHz for a 60-GHz/ms modulation rate signal over the complete range of interest. The presented TX module dissipates 550mW and also includes an adequate on-board directional 4 × antenna array.
Aberrant T-lymphocyte development and function in mice overexpressing human soluble amyloid precursor protein-α: Implications for autism
(2012) Bailey A.; Hou H.; Obregon D.; Tian J.; Zhu Y.; Zou Q.; Nikolic W.; Bengtson M.; Mori T.; Murphy T.; Tan J.
Abnormalities in T-lymphocyte populations and function are observed in autism. Soluble amyloid precursor protein α (sAPP-α) is elevated in some patients with autism and is known to be produced by immune cells. In light of the well-established role of sAPP-α in proliferation, growth, and survival of neurons, we hypothesized an analogous role in the immune system. Thus, we explored whether sAPP-α could modulate immune development and function, especially aspects of the pinnacle cell of the adaptive arm of the immune system: the T cell. To do this, we generated mice overexpressing human sAPP-α and characterized elements of T-cell development, signal transduction, cytokine production, and innate/adaptive immune functions. Here, we report that transgenic sAPP-α-overexpressing (TgsAPP-α) mice displayed increased proportions of CD8 + T cells, while effector memory T cells were decreased in the thymus. Overall apoptotic signal transduction was decreased in the thymus, an effect that correlated with dramatic elevations in Notch1 activation; while active-caspase-3/total-caspase-3 and Bax/Bcl-2 ratios were decreased. Greater levels of IFN-γ, IL-2, and IL-4 were observed after ex vivo challenge of TgsAPP-α mouse splenocytes with T-cell mitogen. Finally, after immunization, splenocytes from TgsAPP-α mice displayed decreased levels IFN-γ, IL-2, and IL-4, as well as suppressed ZAP70 activation, after recall antigen stimulation. Given elevated levels of circulating sAPP-α in some patients with autism, sAPP-α could potentially drive aspects of immune dysfunction observed in these patients, including dysregulated T-cell apoptosis, aberrant PI3K/AKT signaling, cytokine alterations, and impaired T-cell recall stimulation. © FASEB.
Abortion and breast cancer: Case-control study
(2013) Ilic, Milena; Vlajinac H.; Marinkovic J.; Sipetic Grujicic S.
Aims and background. The aim of the present study was to examine if certain aspects of a woman's experience of abortion might be associated with the risk of breast cancer. Methods and study design. The case-control study was conducted in Kragujevac (Serbia) during the period 2004-2005. The case group (191 women) consisted of patients with newly diagnosed first primary breast cancer, which was histologically confirmed. The control group (191 women), individually matched by age (± 2 years), hospital admittance and place of residence (rural/urban) to the respective cases, was selected from female patients admitted for other diseases. The analysis was restricted to parous women (168 cases and 171 controls). Results. Breast cancer risk was reduced among women who had a history of any abortion (adjusted OR, 0.46; 95% CI, 0.24-0.88). The protective effect was found for both induced abortion (adjusted OR, 0.47; 95% CI, 0.25-0.90) and spontaneous abortion (adjusted OR, 0.31; 95% CI, 0.10-0.98). It seems that these associations did not depend on the number of abortions, age at first abortion, or gestational age at first aborted pregnancy. Conclusions. Our study suggests that even short pregnancies ending in abortion add to the protection against breast cancer.
Air quality and impact on food safety
(2019) Vesković-Moračanin, Slavica; Memiši, Nurgin; Dukić D.; Milijasevic M.; Borović B.; Rašeta M.
© Published under licence by IOP Publishing Ltd. Air is an important potential source of contamination in different areas of human endeavor (medicine, pharmaceuticals, agriculture, food industry etc.). During the various technological procedures of producing and processing food, its contamination by polluting substances contained in air, such as suspended particles (physical contamination), combustion products and volatile organic substances (chemical contamination) and biological pollutants (bacteria, viruses, molds and mites) very often occurs. Although the sources of air contamination are numerous (poor construction aspects of the building, improper air conditioning and ventilation, etc.), basic and common sources are people and their activities in food production plants. The task of responsible food production is to adequately and continuously implement good production practices, and thereby, prevent potentially harmful practices, to ensure environmental health and safety for the life and work of the staff in that environment, and to create conditions for safe food production, while protecting the environment.
An application of learning machine methods in prediction of wear rate of wear resistant casting parts
(2013) Slavkovic R.; Knezevic Jugovic, Zorica; Dragicevic D.; Jovicic A.; Slavkovic V.
In this paper, a method of floating ball wear rate identification, using two machine-learning techniques Support Vector Machine (SVM) and Improved Support Vector Machine (ISVM) are proposed. Both models are used to relate the wear rate and technological parameters of the wear resistant drip moulding using different kernel functions. The models for determining the wear rate of white iron casting with low chromium content (flotation balls), was trained and tested by using the existing exploitation data from the Bor Flotation Plant, Serbia. In order to select the best model parameters the statistical indicators for both models are presented. Results show that the ERBF (SVM) and ERBF+POLY (ISVM) achieved the best classification accuracy compare to other kernels used: the absolute mean error of ERB (SVM) is 5.85%, while the error of ERBF+POLY (ISVM) is 6.67%. The tuned ISVM model with mixture of kernels is able to accurately predict the wear rate and can be used to define the optimum chromium content in liquid metal alloys for the casting of flotation balls. © 2013 Elsevier Ltd. All rights reserved.
An approach to an NVH investigation of vehicle hydraulic pumps
(2011) Lukić J.
This work presents a method for analyzing the noise and vibration problems caused by hydraulic pumps in vehicles. This methodology is based on experimental research and coherent analysis of observed systems. Experimental investigations are conducted in order to determine dominant excitation of hydraulic systems. Vibrations and sound pressure levels of pumps were investigated with respect to the determination of the influences on pump NVH. Measurements were performed in different operating conditions. Pressure of oil in the hydraulic system was varied. A new method of assessment and determination of dominant NVH pump excitation is presented. Experimental results are used as input and output data for coherent analysis. Performed analyses of coherent functions showed dependence of pump velocity and sound pressure level especially in the low frequency region to 4.5 kHz. Results showed that the number of measuring channels can be reduced, especially in high frequency domain. Results can be used in experimental design.
An FMCW fractional-N PLL-based synthesizer for integrated 79 GHz automotive radar sensors
(2017) Milosavljević, Ivan; Glavonjic D.; Krcum, Dusan; Tasovac D.; Saranovac, Lazar; Milovanović, Vladimir
© 2017 IEEE. A fully-integrated and highly linear 79 GHz FMCW synthesizer that is based on fractional-N PLL and intended for automotive radar applications is presented. The frequency synthesizer covers complete automotive band 77-81 GHz of interest and is able to generate complex modulation waveforms with up to 16 different chirp slopes in the single modulation scheme. This helps eliminating potential ghost targets in multitarget environments by careful radar signal post-processing. High chirp linearity with the worst-case frequency error that is lower than 200 kHz across the full 4 GHz tuning range enables high ranging and radial velocity resolutions. The proposed FMCW synthesizer occupies 1.8mm2 of area and dissipates 0.35 W as a stand-alone chip solution in the standard SiGe:C HBT 130nm BiCMOS process technology.
An intelligent based-model role to simulate the factor of safe slope by support vector regression
(2019) Sari P.; Suhatril M.; Osman N.; Mohammed, Mu'azu; Dehghani H.; Sedghi Y.; Safa M.; Hasanipanah, Mahdi; Wakil, Karzan; Khorami, Majid; Djuric P.
© 2018, Springer-Verlag London Ltd., part of Springer Nature. An infrastructure development in landscape and clearing of more vegetated areas have provided huge changes in Malaysia gradually leading to slope instabilities accompanied by enormous environmental effects such as properties and destructions. Thus, prudent practices through vegetation incorporating to use slope stability is an option to the general stabilized technique. Few researches have investigated the effectiveness of vegetative coverings related to slope and soil parameters. The main goal of this study is to provide an intelligent soft computing model to predict the safety factor (FOS) of a slope using support vector regression (SVR). In the other words, SVR has investigated the surface eco-protection techniques for cohesive soil slopes in Guthrie Corridor Expressway stretch through the probabilistic models analysis to highlight the main parameters. The aforementioned analysis has been performed to predict the FOS of a slope, also the estimator’s function has been confirmed by the simulative outcome compared to artificial neural network and genetic programing resulting in a drastic accurate estimation by SVR. Using new analyzing methods like SVR are more purposeful than achieving a starting point by trial and error embedding multiple factors into one in ordinary low-technique software.

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