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Showing 1 to 4 of 4 (0.03 seconds)Spelling suggestions: "subject:"računara""
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Upravljanje komunikacionom mrežom elektroenergetske pametne mreže sa promenljivim komunikacionim zahtevima / Smart grid communication network management with variable communication requirementsČokić Mita 07 October 2020 (has links)
<p>Pametna elektroenergetska mreža predstavlja mrežu nove generacije koja treba da bude efikasna, proširiva, pouzdana i jednostavna za upravljanje. Pametnu mrežu karakteriše veliki broj uređaja i dvosmerna komunikacija sa njima. Ovi uređaji će generisati ogromne količine podataka koje je potrebno pročitati i transportovati do kontrolnog centra, za šta je neophodna odgovarajuća komunikaciona infrastruktura koja obezbeđuje adekvatan kvalitet usluge. U ovoj disertaciji je prikazano rešenje za obezbeđivanje kvaliteta usluge sabraćaja sa dinamičkim promenama prioriteta i propusnog opsega bazirano na programabilnim računarskim mrežama. Takođe je razvijena platforma za evaluaciju komunikacione infrastrukture pametnih mreža kako bi se omogućilo jednostavnije emuliranje različitih mrežnih topologija za potrebe razvoja novih algoritama upravljanja. Performanse rešenja su potvrđene putem šest testnih scenarija i pokazano je da predstavljeno rešenje daje bolje rezultate za sve scenarije sa aspekta obezbeđivanja propusnog opsega i mrežnog kašnjenja.</p> / <p>Smart grid represents the next generation power network which should be efficient, extensible, reliable and easy to manage. The smart grid will have a great number of devices with two-way communication. These devices will generate large amount of data that needs to be read and transported to utility control center, which further requires adequate communication infrastructure with appropriate quality of service. This dissertation presents a solution for providing quality of service for traffic with dynamic priority and bandwidth requirements, based on software defined networks. The platform for smart grid communication infrastructure evaluation is developed to enable easy emulation of different network topologies for the purpose of developing new control algorithms. Solution performance is verified using six test scenarios and it is shown that the proposed solution gives better results for all scenarios from the aspect of bandwidth provision and network latency.</p>
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Dizajniranje, fizičko-hemijska karakterizacija, toksičnost i primena nove klase funkcionalizovanih jonskih tečnosti / Design, physico-chemical characterisation, toxicity and application of newly class of functionalized ionic liquidsAleksandar Tot 03 July 2019 (has links)
<p>U ovoj doktorskoj disertaciji sintetisane su dve različite klase jonskih tečnosti, na bazi imidazolijuma i holinijuma, sa ciljem snižavanja toksičnosti. Imidazolijumove jonske tečnosti su funkcionalizovane hidroksilnom i etarskom grupom u bočnom lancu. Uspešnost sinteza jonskih tečnosti potvrđena je snimanjem IC i NMR spektara. Izmerene su gustine, viskoznosti i provodljivosti čistih imidazolijumovih i holinijumskih jonskih tečnosti. Na osnovu dobijenih eksperimentalnih rezultata,potpomognutim računarskim simulacijama diskutovana je strukturna organizacija između katjona i anjona. Utvrđeno je da prisustvo hidroksilne grupe u bočnom lancu imidazolovog katjona, značajno utiče na lokaciju anjona i samim tim na makroskopska svojstva. U nastavku su izmerene gustine i viskoznosti vodenih rastvora sa ciljem dobijanja informacija o uticaju dodatka holinijumskih i imidazolijumovih jonskih tečnosti na strukturu vode. Na osnovu B koeficijenta iz<br />viskoznosti, ekspanzibilnosti i rezultata simulacija molekulske dinamike, utvrđeno je da sve jonske tečnosti imaju structure making osobine. Takođe, na osnovu izračunatih specifičnih molarnih zapremina i doking analize na receptoru za gorak ukus,<br />ustanovljeno je da vodeni rastvori holinijumskih jonskih tečnosti imaju gorak ukus.<br />Toksičnost funkcionalizovanih imidazolijumovih jonskih tečnosti ispitana je na nekoliko biljnih vrsta (pšenica, ječam i krastavac), kao i na larvama <em>A. salina</em> i ćelijskoj liniji MRC-5. Potvrđeno jeda uvođenje hidroksilne grupe u alkil niz najviše se redukuju<br />toksičnosti imidazolijumovih jonskih tečnosti, dok je uticaj etarske grupe na smanjenje toksičnosti značajno manji. Ispitivanje citotoksičnosti i antibakterijske aktivnosti ukazalo je da holinijumske jonske tečnosti se mogu smatrati netoksičnima, i<br />pokazuju beningnije dejstvo u poređenju sa njihovim polaznim komponentama (askorbinska kiselina, biotin i nikotinska kiselina).</p> / <p><!--[if gte mso 9]><xml> <w:WordDocument> <w:View>Normal</w:View> <w:Zoom>0</w:Zoom> <w:TrackMoves/> <w:TrackFormatting/> <w:PunctuationKerning/> <w:ValidateAgainstSchemas/> <w:SaveIfXMLInvalid>false</w:SaveIfXMLInvalid> <w:IgnoreMixedContent>false</w:IgnoreMixedContent> <w:AlwaysShowPlaceholderText>false</w:AlwaysShowPlaceholderText> <w:DoNotPromoteQF/> <w:LidThemeOther>EN-US</w:LidThemeOther> <w:LidThemeAsian>X-NONE</w:LidThemeAsian> <w:LidThemeComplexScript>X-NONE</w:LidThemeComplexScript> <w:Compatibility> <w:BreakWrappedTables/> <w:SnapToGridInCell/> <w:WrapTextWithPunct/> <w:UseAsianBreakRules/> <w:DontGrowAutofit/> <w:SplitPgBreakAndParaMark/> <w:DontVertAlignCellWithSp/> <w:DontBreakConstrainedForcedTables/> 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5"/> <w:LsdException Locked="false" Priority="71" SemiHidden="false" UnhideWhenUsed="false" Name="Colorful Shading Accent 5"/> <w:LsdException Locked="false" Priority="72" SemiHidden="false" UnhideWhenUsed="false" Name="Colorful List Accent 5"/> <w:LsdException Locked="false" Priority="73" SemiHidden="false" UnhideWhenUsed="false" Name="Colorful Grid Accent 5"/> <w:LsdException Locked="false" Priority="60" SemiHidden="false" UnhideWhenUsed="false" Name="Light Shading Accent 6"/> <w:LsdException Locked="false" Priority="61" SemiHidden="false" UnhideWhenUsed="false" Name="Light List Accent 6"/> <w:LsdException Locked="false" Priority="62" SemiHidden="false" UnhideWhenUsed="false" Name="Light Grid Accent 6"/> <w:LsdException Locked="false" Priority="63" SemiHidden="false" UnhideWhenUsed="false" Name="Medium Shading 1 Accent 6"/> <w:LsdException Locked="false" Priority="64" SemiHidden="false" UnhideWhenUsed="false" Name="Medium Shading 2 Accent 6"/> <w:LsdException Locked="false" Priority="65" SemiHidden="false" UnhideWhenUsed="false" Name="Medium List 1 Accent 6"/> <w:LsdException Locked="false" Priority="66" SemiHidden="false" UnhideWhenUsed="false" Name="Medium List 2 Accent 6"/> <w:LsdException Locked="false" Priority="67" SemiHidden="false" UnhideWhenUsed="false" Name="Medium Grid 1 Accent 6"/> <w:LsdException Locked="false" Priority="68" SemiHidden="false" UnhideWhenUsed="false" Name="Medium Grid 2 Accent 6"/> <w:LsdException Locked="false" Priority="69" SemiHidden="false" UnhideWhenUsed="false" Name="Medium Grid 3 Accent 6"/> <w:LsdException Locked="false" Priority="70" SemiHidden="false" UnhideWhenUsed="false" Name="Dark List Accent 6"/> <w:LsdException Locked="false" Priority="71" SemiHidden="false" UnhideWhenUsed="false" Name="Colorful Shading Accent 6"/> <w:LsdException Locked="false" Priority="72" SemiHidden="false" UnhideWhenUsed="false" Name="Colorful List Accent 6"/> <w:LsdException Locked="false" Priority="73" SemiHidden="false" UnhideWhenUsed="false" Name="Colorful Grid Accent 6"/> <w:LsdException Locked="false" Priority="19" SemiHidden="false" UnhideWhenUsed="false" QFormat="true" Name="Subtle Emphasis"/> <w:LsdException Locked="false" Priority="21" SemiHidden="false" UnhideWhenUsed="false" QFormat="true" Name="Intense Emphasis"/> <w:LsdException Locked="false" Priority="31" SemiHidden="false" UnhideWhenUsed="false" QFormat="true" Name="Subtle Reference"/> <w:LsdException Locked="false" Priority="32" SemiHidden="false" UnhideWhenUsed="false" QFormat="true" Name="Intense Reference"/> <w:LsdException Locked="false" Priority="33" SemiHidden="false" UnhideWhenUsed="false" QFormat="true" Name="Book Title"/> <w:LsdException Locked="false" Priority="37" Name="Bibliography"/> <w:LsdException Locked="false" Priority="39" QFormat="true" Name="TOC Heading"/> </w:LatentStyles></xml><![endif]--><!--[if gte mso 10]><style> /* Style Definitions */ table.MsoNormalTable{mso-style-name:"Table Normal";mso-tstyle-rowband-size:0;mso-tstyle-colband-size:0;mso-style-noshow:yes;mso-style-priority:99;mso-style-qformat:yes;mso-style-parent:"";mso-padding-alt:0in 5.4pt 0in 5.4pt;mso-para-margin-top:0in;mso-para-margin-right:0in;mso-para-margin-bottom:10.0pt;mso-para-margin-left:0in;line-height:115%;mso-pagination:widow-orphan;font-size:11.0pt;font-family:"Calibri","sans-serif";mso-ascii-font-family:Calibri;mso-ascii-theme-font:minor-latin;mso-fareast-font-family:"Times New Roman";mso-fareast-theme-font:minor-fareast;mso-hansi-font-family:Calibri;mso-hansi-theme-font:minor-latin;mso-bidi-font-family:"Times New Roman";mso-bidi-theme-font:minor-bidi;}</style><![endif]--></p><p class="MsoNormal">In this doctoral thesis, ionic liquids based on imidazolium and cholinium cation were synthesized, in order to obtain new class of ILs with reduced toxicity. Imidazolium based ionic liquids were functionalized with hydroxyl and ether group in order to reduce their lipophilicity. All newly synthesized compounds were confirmed by measuring IR and NMR spectra. For pure ionic liquids, density, conductivity and viscosity were measured. Based on the obtained experimental results supported with results of molecular simulations, it was concluded that presence of oxygen in alkyl side chain of imidazolium ionic liquids significantly contribute to position of anion. Further, density and viscosity of diluted aqueous ILs solutions were measured with a purpose to investigate their influence on water structure. Based on obtained values for viscosicty B coefficient, expansibility and from MD simulations, all ionic liquids express structure making tendency. From calculated specific apparent molar volumes for cholinium ionic liquids it was noted bitter taste. The toxicity of functionalized imidazolium ionic liquids was investigated on different plant species (wheat , barley and cucumber), on larvae of <em><span style="font-family:"Calibri","sans-serif";mso-ascii-theme-font:minor-latin;mso-hansi-theme-font:minor-latin;mso-bidi-font-family:"Times New Roman";mso-bidi-theme-font:minor-bidi"> A. salina</span></em> and cell line MRC-5. From<br />obtained results it was concluded that introduction of hydroxyl group in alkyl side chain reduce toxicity significantly more than ether group. Experiments on cytotoxicicity and antibacterial effects allowed to conclude that those newly synthesized cholinium ionic liquids can be considered as non-toxic.</p>
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Pristup agregaciji mrežnih veza u operativnom sistemu sa mikrojezgrom / Link aggregation approach to a microkernel operating systemStričević Lazar 18 July 2016 (has links)
<p>Teza se bavi povećanjem ukupne oslonljivosti modularnog mikrokernel<br />operativnog sistem MINIX 3 kroz povećanje pouzdanosti njegovog<br />mrežnog podsistema. To je postignuto tako što je ovom operativnom<br />sistemu dodata agregacija mrežnih veza, čime je podražana<br />tolerancija na poremećaj komunikacionih linija. Na kraju je data<br />analiza kako dodati deo utiče na ukupne mrežne performanse.</p> / <p>The thesis deals with the way to increase the dependability of the modular<br />microkernel operating system MINIX 3 through the increase of the reliability<br />of its network subsystem. This is achieved by adding link aggregation to this<br />operating system, which added fault tolerance for the communication lines. At<br />the end, the analysis is given of how new module affects the overall network<br />performance.</p>
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Metode i postupci ubrzavanja operacija i upita u velikim sistemima baza i skladišta podataka (Big Data sistemi) / The methods and procedures for accelerating operations and queries in large database systems and data warehouses ( Big Data Systems )Ivković Jovan 29 September 2016 (has links)
<p>Predmet istraživanja ove doktorske disertacije je mogućnost uspostavljanja modela Big Data sistema sa pripadajućom softversko – hardverskom arhitekturom za podršku senzorskim mrežama i IoT uređajima. Razvijeni model počiva na energetsko efikasnim, heterogenim, masovno paralelizovaim SoC hardverskim platformama, uz podršku softverske aplikativne arhitekture (poput OpenCL) za unifikovan rad.<br />Pored aktuelnih hardverskih, softverskih i mrežnih računarskih tehnologija i arhitektura namenjenih za rad podkomponenata modelovanog sistema u radu je predstavljen istorijski osvrt na njihov razvoj. Time je naglašena tendencija cikličnog kretanja koncepcijskih paradigmi računarstva, kroz svojevrstne ere centralizacije – decentralizacije computinga. U radu su predstavljene tehnologije i metode za ubrzavanje operacija u bazama i skladištima podataka. Istražene su mogućnosti za bolju pripremu Big Data informacionih sistema koji treba da zadovolje potrebe novo najavljene informatičke revolucije opšte primene računarstva tzv. Ubiquitous computing-a i Interneta stvari (IoT).</p> / <p>The research topic of this doctoral thesis is the possibility of establishing a model for Big Data System with corresponding software-hardware architecture to support sensor networks and IoT devices. The developed model is based on energy efficient, heterogeneous, massively parallelized SoC hardware platforms, with the support of software application architecture. (Such as an open CL) for unified operation. In addition to current hardware, software and network computing technologies, and architecture intended to operate subcomponents of the system modeled in this paper is presented as an historical overview of their development. Which emphasizes the tendency of the cyclic movement of the conceptual paradigm of computing, through the unique era of centralization/decentralization of computing. The thesis presents the technology and methods to accelerate operations in databases and data warehouses. We also investigate the possibilities for a better preparation of Big Data information systems to meet the needs of the newly announced IT revolution in the announced general application of computing called Ubiquitous computing and the Internet of Things (IoT).</p>
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