<p>U ovoj doktorskoj disertaciji predložena je nova metoda za detekciju malicioznih napada injektiranjem loših merenja na elektroenergetski sistem. Predloženi algoritam baziran je na sinergiji statičke i dinamičke estimacije stanja, i u stanju je da detektuje ovaj tip napada u realnom vremenu, za najkritičniji scenario gde napadač ima potpuno znanje o sistemu, i neograničen pristup resursima.</p> / <p>This PhD thesis proposes a novel method for detection of malicious false data<br />injection attacks on power system. The proposed algorithm is based on<br />synergy between static and dynamic state estimators, and is capable of<br />detecting the forementioned attacks in real time, for the most critical scenarios,<br />where an attacker has complete knowledge about the compromised power<br />system and unlimited resources to stage an attack.</p>

<p>U ovom radu efikasnost odabranih derivata tiazola u inhibiciji korozije bakra u kiseloj<br />sulfatnoj sredini određena je u funkciji koncentracije inhibitora metodom merenja<br />gubitka mase, elektrohemijskom impedansnom spektroskopijom i potenciostatskom<br />polarizacijom. Polarizacionim merenjima takođe je određena zavisnost inhibitorske<br />efikasnosti od&nbsp; temperature i kinetički parametri procesa korozije bakra&nbsp; kao i&nbsp; model<br />adsorpcione izoterme prema kojem se odigrava proces adsorpcije&nbsp; inhibitora i&nbsp;odgovarajući termodinamički parametri. Merenjima kvarc kristalnom mikrovagom&nbsp;<em>in&nbsp;</em><br /><em>situ&nbsp; </em>je praćen proces elektrohemijskog rastvaranja bakra i adsorpcije ispitivanih<br />inhibitora. SEM/EDX analizom&nbsp; proučavana&nbsp; je promena morfologije bakarne povr&scaron;ine<br />usled dejstva korozione sredine i rastvora inhibitora.&nbsp; Rezultati eksperimentalnih<br />ispitivanja korelirani su&nbsp; sa teorijskim proračunima na nivou teorije funkcionala<br />gustine.</p> / <p>In this work, the efficiency of selected thiazole derivatives in&nbsp; the inhibition of corrosion of copper in the acidic sulfate solution is determined in&nbsp; the function ofthe inhibitors&nbsp; concentration by weight loss method,&nbsp; electrochemical impedance spectroscopy and potentiostatic polarization. The dependence of the inhibition efficiency of temperature and kinetic parameters of the process of corrosion ofcopper&nbsp; as well as&nbsp; adsorption isotherm model&nbsp; according to which takes place the process of adsorption of inhibitors and the corresponding thermodynamic parameters were also&nbsp; determined by polarization measurements.&nbsp; A process of electrochemical copper&nbsp; dissolution and&nbsp; adsorption of tested inhibitors is followedin situ&nbsp; by&nbsp; quartz crystal microbalance&nbsp; measurements Changes in the morphology of the copper surface due to the effects of corrosive environment and the solutions of the&nbsp; inhibitors were studied by SEM/EDX analysis.The experimental results were correlated with theoretical calculations at the density functional theory level.</p>

<p>U disertaciji je predložen i razvijen metod procene izloženosti za<br />širokopojasna merenja nivoa električnog polja visokih frekvencija.<br />Metod je baziran na određivanju granica izloženosti, kao i njihovom<br />prilagođenju spektralnom sadržaju polja na mernoj lokaciji. Verifi-<br />kacija razvijenog metoda je obavljena analizom rezultata eksperimen-<br />talnih merenja u realnim uslovima.</p> / <p>One new exposure assessment approach for broadband measurements of the<br />high-frequency electric field strength is proposed and developed in the thesis.<br />The approach is based on the determination of the upper and lower<br />exposure boundaries, as well as their adaptation to the specral content of the<br />field at the measurement location. The verification of the developed<br />approach was performed by analyzing the results of experimental<br />measurements in real conditions.</p>

<p>U radu je predložena metoda merenja moždanih ERP potencijala zasnovana na merenju harmonika epohe. Predložena metoda je zasnovana na pristupu takozvanog stohastičkog digitalnog merenja na intervalu (SDMI), a hardver sa kojim se ova metoda može implementirati je zasnovan na brzim A/D konvertorima i FPGA strukturi. Metoda je ispitana brojnim simulacijama i eksperimentima i pokazano je da SDMI manjeg broja epoha, sa zadovoljavajućom tačnošću, meri latenciju ERP-a, što je korisno kod vremenski kraćih merenja, kada tačno merenje amplitude ERP komponente nije od značaja.</p>

<p>Cilj doktorske disertacije je da poveže teorijska znanja iz oblasti<br />matematičkog modelovanja sa eksperimentalnim ispitivanjem<br />sagorevanja pšenične slame u nepokretnom sloju, u cilju formiranja<br />matematičkog modela koji će kroz računarske simulacije omogućiti<br />analizu uticaja radnih parametara (gustine sloja, količine vazduha za<br />sagorevanje) na odvijanje procesa sagorevanja, odnosno određivanje<br />brzine sagorevanja, temperaturskog profila u sloju i koncentracije<br />pojedinih gasova u sloju.<br />Takođe, kroz eksperimentalna merenja, osim validacije modela,<br />urađena je analiza i opisivanje pojava i fenomena koji se odvijaju pri<br />sagorevanju pšenične slame u nepokretnom sloju.</p> / <p>The goal of doctoral dissertation is to bring together theoretical knowledge in<br />the field of mathematical modelling and experimental investigation of wheat<br />straw combustion in fixed bed, with the aim of developing a mathematical<br />model which will, through computer simulation, enable the analysis of effects<br />of operational parameters (bed density, amount of combustion air) on the<br />combustion process, as well as the determination of burning rate, bed<br />temperature profile and concentration of certain gases in the bed.<br />Also, through experimental measurements, in addition to validating the<br />mathematical model, the analysis and description of the phenomena that<br />occurre during the combustion of wheat straw in a fixed bed, was performed.</p>

<p>U postupku praćenja stanja građevinskih struktura vr&scaron;i se nadzor nad fizičkim (mehaničkim), meteorolo&scaron;kim i hemijskim parametrima. U praksi se za merenje navedenih parametara koristi veliki broj instrumenata-senzora. Na osnovu uvida u aktuelno stanje iz oblasti istraživanja, zatim evidentne potrebe za istraživanjima o potencijalu postojećih i novih instrumenata i senzora za merenje geometrijskih deformacija i ekspanziji kori&scaron;ćenja fiber optičke senzorske tehnologije definisana je oblast istraživanja ove doktorske disertacije. U doktorskoj disertaciji izvr&scaron;eno je teorijsko i eksperimentalno istraživanje postojećih metoda za praćenje geometrijskih deformacija i razvoj sistema baziranog na fiber optičkom senzoru zakrivljenosti (eng. Fiber Optic Curvature Sensor &ndash; FOCS).</p> / <p>In the process of structural health monitoring (SHM) inspection of physical (mechanical), meteorological and chemical parameters is performed. In practice, a large number of instruments-sensors are used to measure these parameters. The field of research of this doctoral dissertation is based on the insight into the current state in the field of research, then the evident need for research on the potential of existing and new instruments and sensors for measuring geometric deformations and the usage expansion of fiber optic sensor technology. In the doctoral dissertation, theoretical and experimental study of the existing methods for monitoring geometric deformations and the development of a fiber optic curvature sensor (FOCS) system is performed.</p>

<p>U okviru ovog rada je razvijen ravanski model koji sadrži sve važne aspekte interakcije vode, nanosa i zagađivača u prirodnim vodotocima. Model obuhvata procese<br />strujanja vode, oba oblika kretanja nanosa (suspendovani i vučeni), mehanizme<br />razmene mase između nanosa u suspenziji i nanosa u aktivnom sloju, deformacije korita usled erozije i deponovanja nanosnog materijala, mehanizme razmene<br />mase između nanosa u aktivnom sloju i aktivnom stratumu, kao i procese transporta nekonzervativne zagađuju&acute;ce materije koja je u interakciji sa nanosom preko<br />procesa adsorpcije/desorpcije. Formulisane jednačine transporta zagađivača obuhvataju njegovu pojavu u rastvorenom i adsorbovanom obliku. Razmena između<br />dva vida pojave zagađivača (rastvoreni i adsorbovani) je opisana preko kinetickih<br />procesa prvog reda, pri cemu je modelisanje koeficijenata razmene usko povezano<br />sa dostupnom povrˇsinom za adsorpciju. Sa druge strane, razmena između materije<br />adsorbovane na suspendovani nanos, odnosno materije adsorbovane na nanos u aktivnom sloju je neposredno vezana za nanosne procese uvlačenja zrna u suspenziju i<br />deponovanja istih iz suspenzije. Početni &scaron;ematski testovi su podrazumevali proveru<br />razvijenog algoritma za re&scaron;avanje advektivnih članova jednačina. Druga grupa &scaron;ematskih testova je podrazumevala implementaciju razvijenog modela transporta<br />zagađujuće materije, pri čemu su testirani i kvalitativno ocenjeni mehanizmi<br />razmene i interakcije. Za testiranje modela na primerima aluvijalnih vodotokova<br />izabrane su dve deonice reke Dunav. Prva lokacija se nalazi u pograniˇcnoj zoni<br />između Mađarske i Srbije gde su testirani aspekti modela koji se odnose na<br />proracun tečenja i pona&scaron;anje nanosa. Druga deoncia se nalazi kod Beograda<br />gde je, pored proračuna strujanja i nanosa, vr&scaron;ena analiza modela transporta zagađujuće materije obuhvatajući sve relevantne mehanizme i aspekte izučavanih<br />procesa. Upoređivanjem terenskih merenja i rezultata proračuna je konstatovano<br />da razvijeni model može simulirati interakciju vode, nanosa i zagađivača u prirodnim vodotocima sa zadovoljavajucom tačno&scaron;ću i pouzdano&scaron;ću.<br />&nbsp;</p> / <p>This work presents the development of a two-dimensional model for flow, sediment<br />and pollutant interaction in natural watercourses. The model incorporates water<br />flow computation, both aspects of sediment transport (suspended and bed-load),<br />the mechanisms of exchange between suspended and bed sediment, bed evolution<br />due to erosion and deposition, the mechanisms of exchange between active layer<br />and active stratum sediment, as well as the processes of nonconservative pollutant<br />transport including its interaction with sediment particles by adsorption/desorption.<br />Deriving the governing equations for pollutant transport included the dissolved and<br />adsorbed pollutant. The exchange between the dissolved and adsorbed pollutant<br />was described using a first order kinetic process, while the modeling of the exchange<br />coefficients remained closely related to the sediment surface available for adsorption.<br />On the other hand, the exchange between the pollutant adsorbed on suspended sediment and the pollutant adsorbed on active layer sediment was directly related<br />to the sediment processes of entrainment and deposition. Numerical tests included<br />the evaluation of the developed algorithm for advection terms. The second group<br />of numerical tests targeted the pollutant transport model, with the emphasis on<br />the mechanisms of exchange and interaction. For field test cases two reaches of the<br />Danube River were used. The first reach was located in the border area between<br />Hungary and Serbia. Field data collected there was used to analyze the developed<br />model&rsquo;s ability to simulate flow and sediment transport. Data collected on the second reach near Belgrade was used to perform flow, sediment and pollutant transport<br />simulations, taking into account all the relevant mechanisms of the studied processes.<br />Comparing the computed and measured values, it was concluded that the developed<br />model is able to simulate the interaction of flow, sediment and pollutant in natural<br />watercourses with acceptable precision and reliability.</p>

<p>Uvod: Individualno kreiran program vežbi lumbalne stabilizacije, mogao bi da doprinese boljem oporavku pacijenata sa hroničnim bolom u donjem delu leđa. Program vežbi u lečenju hroničnog lumbalnog bola je prilično raznolik, ali je dokazano da su vežbe stabilizacije najefikasnije, posebno vežbe u zatvorenom kinetičkom lancu. Cilj: je bio da se uporedi program vežbi lumbalne stabilizacije u otvorenom i zatvorenom kinetičkom lancu, u odnosu na program vežbi lumbalne stabilizacije i torakalne mobilizacije u zatvorenom kinetičkom lancu kao i da se proceni klinička efikasnost oba programa vežbi. Metode: Istraživanje je sprovedeno kao prospektivna, eksperimentalna studija na 80 ispitanika oba pola (35 mu&scaron;karaca, 45 žena), prosečne životne dobi (48.45+/- 10.22 godina) sa hroničnim lumbalnim bolom. Istraživanje je sprovedeno na Klinici za rehabilitaciju &bdquo;dr Miroslav Zotović&ldquo; u Beogradu u periodu od juna 2017. do marta 2018. godine. Ispitanici su podeljeni u dve grupe od 40 pacijenata. Prva grupa ispitanika je sprovodila program vežbi lumbalne stabilizacije i torakalne mobilizacije u zatvorenom kinetičkom lancu (LSTMZ), a druga program vežbi lumbalne stabilizacije u zatvorenom i otvorenom kinetičkom lancu (LSZO). Pored op&scaron;tih demografskih, antropometrijskih podataka o ispitanicima, kori&scaron;ćeni su sledeći upitnici i testovi: za procenu intenziteta bola u leđima i donjim ekstremitetima- vizuelna analogna skala (VAS), za procenu neuropatske komponente bola- DN4 (Douleur Neuropathique en 4 Questions), za procenu funkcionalnog statusa kori&scaron;ćen je Osvestrijev upitnik o onesposobljenosti (ODI), procena sagitalne pokretljivosti lumbosakralne kičme Schober testom, procena mi&scaron;ićne snage - manuelnim mi&scaron;ićnom testom; Ispitivanje senzitivnosti na ključnim senzornim tačkama za dermatome je vr&scaron;eno prema ASIA (American Spinal Injury Association) skali, testom istezanja ishiadičnog (Lazarevićev) i femoralnog nerva ispitivano je prisustvo kompresije nervnih korenova, za procenu stabilnosti lumbosakralne kičme- je kori&scaron;ćen test nestabilnosti u proniranom položaju (Prone Instability test). Ispitanici su ergonomski edukovani, sprovedena je transkutana elektro-nervna stimulacija (TENS) i primenjivana je laseroterapija male snage. Pacijentima je određena osmonedeljna kineziterapija koja je obuhvatala vežbe za jačanje dubokih stabilizatora lumbalne kičme. Retestiranje je rađeno nakon 4 i 8 nedelja. Rezultati: Kod obe grupe ispitanika u svim intervalima merenja je nađena visoka statistički značajna (p&lt; 0,001) redukcija intenziteta bola prema VAS skali za lumbalnu kičmu i donje ekstremitete,&nbsp;&nbsp; pobolj&scaron;anje funkcionalnog statusa (Oswestry) i sagitalne pokretljivosti (Schober). Statistički značajan (p&lt;0,05) oporavak ispitanika grupe 1 u odnosu na grupu 2, ostvaren je u svim intervalima merenja kod parametara: Intenzitet bola (VAS LS i VAS za nogu), stepen onesposobljenosti (ODI),vrednost motornog skora za trup merenog ASIA skalom i vrednost neuropatske komponente bola (DN4). Statistički značajan (p&lt; 0,05) oporavak ispitanika u grupi 2 u odnosu na grupu 1, ostvaren je posle 8 nedelja kod parametra za procenu vrednosti&nbsp; senzornog skora dodir prema ASIA skali. Utvrđeno je da veće početne vrednosti intenziteta bola prema skalama Vas ls i Vas za nogu i stepena onesposobljenosti prema ODI, negativno utiču na krajnji ishod ovih parametara kod pacijenata sa HLB-om u obe grupe (p&lt;0,05). Pacijenti sa pozitivnom neuropatskom komponentom bola imaju lo&scaron;iji ishod lečenja HLB-a vežbama stabilizacije i torakalne mobilizacije (p&lt;0,05). Zaključci: Pacijenti koji su radili program vežbi lumbalne stabilizacije i torakalne mobilizacije u zatvorenom kinetičkom lancu su imali bolji funkcionalni oporavak i značajniju redukciju intenziteta bola u odnosu na ispitanike koji su radili program vežbi lumbalne stabilizacije u zatvorenom i otvorenom kinetičkom lancu.</p> / <p>Introduction: An individual program of lumbar stabilization exercises could contribute to a better recovery of patients with chronic lower back pain. The exercise program in the treatment of chronic lumbar pain is quite diverse, but it has been proven that stabilization exercises are most effective, especially in a closed kinetic chain. Objective: was to compare the program of lumbar stabilization exercises in the open and closed kinetic chain, in relation to the program of lumbar stabilization exercises and thoracic mobilization in a closed kinetic chain, and to evaluate the clinical efficacy of both exercise programs. Methods: The study was conducted as a prospective, experimental study of 80 subjects of both sexes (35 men, 45 women), average life expectancy (48.45 +/- 10.22 years) with chronic lumbar pain. The research was conducted at the Rehabilitation Clinic &quot;Dr. Miroslav Zotović&quot; in Belgrade in the period from June 2017 to March 2018. Respondents were divided into two groups of 40 patients. The first group of respondents carried out a lumbar stabilization and thoracic mobilization program in a closed kinetic chain (LSTMZ) and the second, program of lumbar stabilization exercises in closed and open kinetic chain (LSZO). In addition to general demographic, anthropometric data on respondents, the following questionnaires and tests were used: for assessing the intensity of back pain and lower extremities - visual analogue scale (VAS), for assessing the neuropathic pain component DN4 (Douleur Neuropathique en 4 Questions),&nbsp; for functional status assessment was used Oswestry disability index (ODI), for assessment of sagittal mobility of the lumbosacral spine- Schober test, muscular strength assessment - manual muscle test; Sensitivity testing at key sensory points for dermatomas was performed according to the ASIA (American Spinal Injury Association) scale, stretching test of the ishiadic (Lazarević) and femoral nerves was udes for detection of nerve root irritation, and the Prone Instability test was used to assess the stability of the lumbosacral spine. Respondents were ergonomically educated, transcutaneous electrical-nerve stimulation (TENS) and low-power laser therapy were performed. Patients were given an eight-week kinesiotherapy that included exercises to strengthen the deep lumbar spine stabilizers. Retesting was done after 4 and 8 weeks. Results: In both groups of subjects, high statistically significant (p &lt;0.001) reduction of pain intensity to VAS scale for lumbar spine and for the leg, functional disability (Oswestry) sagital mobility of lumbar spine (Schober) improvement were found at all measurement intervals. The statistically significant (p &lt;0.05) recovery of group 1 subjects compared to group 2 was achieved at all measurement intervals in the parameters: Pain intensity (VAS LS and VAS for the leg), degree of disability (ODI), motor score value for the trunk measured by the ASIA scale and the value of the neuropathic pain component (DN4). Statistically significant (p &lt;0.05) recovery of group 2 subjects compared to group 2 was achieved after 8 weeks with the parameter for assessing the sensory touch score value to the ASIA scale. It has been found that higher initial pain intensity values to VAS ls and VAS for leg and degree of disability to ODI, negatively affect the final outcome of these parameters in patients with chronic low back pain in both groups of subject (p&lt;0,05). Patients with a positive neuropathic pain component have a lower outcome of chronic low back pain treatment with lumbar stabilization and thoracic mobilization exercises (p&lt;0,05). Conclusions: Patients who performed lumbar stabilization and thoracic mobilization exercises program in a closed kinetic chain had better functional recovery and a significant reduction in pain intensity compared to respondents who performed a lumbar stabilization program in a closed and open kinetic chain.</p>