type: other

text:
+publisher:"Vilnius Gediminas Technical University" +contributor:("Barauskas, Rimantas") – OATD
 You searched for +publisher:"Vilnius Gediminas Technical University" +contributor:("Barauskas, Rimantas"). Showing records 1 – 28 of 28 total matches.
 1. Jakušev, Aleksandr. Diferencialinių lygčių ir jų sistemų skaitinio sprendimo algoritmų lygiagretinimo technologijos kūrimas, analizė ir taikymai.
 URL: http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2008~D_20090217_160637-75872 ;
 Šiame darbe pateikiama nauja tiesinės algebros algoritmų, atsirandančių sprendžiant dif. lygtis ir jų sistemas, lygiagretinimo technologija. Ši technologija apjungia "lygiagrečiųjų duomenų" ir "globalios atminties" lygiagretinimo... (more)
 Šiame darbe pateikiama nauja tiesinės algebros algoritmų, atsirandančių sprendžiant dif. lygtis ir jų sistemas, lygiagretinimo technologija. Ši technologija apjungia "lygiagrečiųjų duomenų" ir "globalios atminties" lygiagretinimo modelių privalumus, ir, naudojant apibrėžtos klasės uždavinių yptaumus, leidžia lengvai gauti efektyvų programos kodą, kuris pusiau automatiškai lygiagretinamas. Darbas susideda iš 3 dalių: egzistuojančių priemonių apžvalga, naujos technologijos aprašymas, įvairūs taikymai.
 The new parallelization technology is presented in this work. The technology is suitable for parallelization of linear algebra problems that arise during solution of PDE and PDE systems. The new technology combines the strong points of "data parallel" and "global memory" parallel programming models. Using the pecularities of the problems of a given class, the technology allows to write effective code easily, with the addition of the possibility for semi-automatic parallelization. The work consists of 3 parts: the review of existing technologies, the description of the new one, various applications.
 Advisors/Committee Members: Čiegis, Raimondas (Doctoral dissertation supervisor), Baušys, Romualdas (Doctoral dissertation committee chair), Barauskas, Rimantas (Doctoral dissertation committee member), Dzemyda, Gintautas (Doctoral dissertation committee member), Ivanauskas, Feliksas (Doctoral dissertation committee member), Kačeniauskas, Arnas (Doctoral dissertation committee member), Pranevičius, Henrikas (Doctoral dissertation opponent), Žilinskas, Julius (Doctoral dissertation opponent).
 Subjects/Keywords: Lygiagretieji algoritmai; Lygiagretinimas; Diferencialinių lygčių sistemų sprendimas; C++; MPI; Parallel algorithms; Parallelization; PDE systems solution; C++; MPI
 Jakušev, Aleksandr. (2009). Diferencialinių lygčių ir jų sistemų skaitinio sprendimo algoritmų lygiagretinimo technologijos kūrimas, analizė ir taikymai . (Doctoral Dissertation). Vilnius Gediminas Technical University. Retrieved from http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2008~D_20090217_160637-75872 ;
 Jakušev, Aleksandr. “Diferencialinių lygčių ir jų sistemų skaitinio sprendimo algoritmų lygiagretinimo technologijos kūrimas, analizė ir taikymai.” 2009. Doctoral Dissertation, Vilnius Gediminas Technical University. Accessed October 19, 2019. http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2008~D_20090217_160637-75872 ;.
 Jakušev, Aleksandr. “Diferencialinių lygčių ir jų sistemų skaitinio sprendimo algoritmų lygiagretinimo technologijos kūrimas, analizė ir taikymai.” 2009. Web. 19 Oct 2019.
 Jakušev, Aleksandr. Diferencialinių lygčių ir jų sistemų skaitinio sprendimo algoritmų lygiagretinimo technologijos kūrimas, analizė ir taikymai. [Internet] [Doctoral dissertation]. Vilnius Gediminas Technical University; 2009. [cited 2019 Oct 19]. Available from: http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2008~D_20090217_160637-75872 ;.
 Jakušev, Aleksandr. Diferencialinių lygčių ir jų sistemų skaitinio sprendimo algoritmų lygiagretinimo technologijos kūrimas, analizė ir taikymai. [Doctoral Dissertation]. Vilnius Gediminas Technical University; 2009. Available from: http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2008~D_20090217_160637-75872 ;
 2. Mačiūnas, Darius. Multi-objective global optimization of grillages using genetic algorithms.
 Degree: PhD, Mechanical Engineering, 2013, Vilnius Gediminas Technical University
 URL: http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2013~D_20130614_152610-90019 ;
 The ability to design the rational structure in short terms is obvious economical demand hence the engineer must have at his disposal the methodology of... (more)
 The ability to design the rational structure in short terms is obvious economical demand hence the engineer must have at his disposal the methodology of optimization of such structures. Grillage structures are widely used in engineering practice, e. g. in construction of so-called grillage-type foundations (further grillages). Nowadays the good-performing optimization algorithms for topology optimization of grillages – separately investigating each beam in the grillage – are elaborated therefore the main attention of this work is devoted to the simultaneous topology and size optimization of grillages, which is obviously insufficiently explored so far. The optimal grillage should meet twofold criteria: the number of piles should be minimal, and the connecting beams should receive minimal feasible bending moments what leads to minimal consumption of concrete for beams. Obviously two separate optimization problems are considered here: determination of minimal number of piles and determination of minimal volume of beams. Whereas the carrying capacity of a single pile is known, the first optimization problem can be rendered as minimization of the maximal reactive force in piles among all set of piles. Analogously, the second problem corresponds to the minimization of the maximal bending moments in connecting beams. The bending moments depend also on stiffness of beams hence the cross-sectional dimensions of beams must be identified simultaneously. Both problems can be incorporated... [to full text]
 Sijynų optimizavimo rezultatai turi didelę reikšmę ekonominiu požiūriu, nes ypatingai svarbu gebėti greitai suprojektuoti pigią ir tuo pačiu racionalią bei patvarią konstrukciją. Todėl inžineriniu požiūriu šios problemos sprendimo rezultatai turi didelę reikšmę kuriant efektyvią sijynų optimizavimo technologiją. Sijynai – sudaryti iš polių ir jungiančiųjų sijų – yra labai efektyvios ir paplitusios polinių pamatų inžinerinės konstrukcijos. Šiame darbe dėmesys bus skiriamas iki šiol dar nepakankamai išnagrinėtam sijynų topologijos ir matmenų sinchroniniam optimizavimui. Šioje disertacijoje topologijos optimizavimas suprantamas kaip optimalios polių išdėstymo po jungiančiosiomis sijomis schemos ieškojimas esant duotam polių skaičiui, o matmenų optimizavimas – kaip jungiančiųjų sijų skerspjūvio optimalių matmenų ieškojimas, laikant, kad visų sijų skerspjūvis vienodas. Darbe bus bandoma apjungti topologijos ir matmenų optimizavimą į vieną algoritmo žingsnį, tuo padidinant tikimybę gauti geresnį optimizavimo sprendinį. Ši problema yra daugiakriterio globalaus optimizavimo uždavinys. Iki šiol tokie didelės apimties uždaviniai nėra iki galo išspręsti, nes jie yra pakankamai sudėtingi: tenka optimizuoti nuo didelio projektavimo kintamųjų skaičiaus priklausančią kompromisinę tikslo funkciją. Apytikriai galima laikyti, kad sijynai, kurie turi mažiausią įmanomą polių skaičių bei kurių jungiančiosios sijos yra mažiausio skerspjūvio, yra pigiausi. Matematiniu požiūriu tokių sijynų... [toliau žr. visą tekstą]
 Advisors/Committee Members: Belevičius, Rimantas (Doctoral dissertation supervisor), Kačianauskas, Rimantas (Doctoral dissertation committee chair), Atkočiūnas, Juozas (Doctoral dissertation committee member), Dzemyda, Gintautas (Doctoral dissertation committee member), Gaidys, Rimvydas (Doctoral dissertation committee member), Žilinskas, Julius (Doctoral dissertation committee member), Barauskas, Rimantas (Doctoral dissertation opponent), Turla, Vytautas (Doctoral dissertation opponent).
 Subjects/Keywords: Multi-objective optimization; Global optimization; Grillage; Genetic algorithm; Finite element method; Daugiakriteris optimizavimas; Globalus optimizavimas; Sijynas; Genetinis algoritmas; Baigtinių elementų metodas
 Mačiūnas, D. (2013). Multi-objective global optimization of grillages using genetic algorithms . (Doctoral Dissertation). Vilnius Gediminas Technical University. Retrieved from http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2013~D_20130614_152610-90019 ;
 Mačiūnas, Darius. “Multi-objective global optimization of grillages using genetic algorithms.” 2013. Doctoral Dissertation, Vilnius Gediminas Technical University. Accessed October 19, 2019. http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2013~D_20130614_152610-90019 ;.
 Mačiūnas, Darius. “Multi-objective global optimization of grillages using genetic algorithms.” 2013. Web. 19 Oct 2019.
 Mačiūnas D. Multi-objective global optimization of grillages using genetic algorithms. [Internet] [Doctoral dissertation]. Vilnius Gediminas Technical University; 2013. [cited 2019 Oct 19]. Available from: http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2013~D_20130614_152610-90019 ;.
 Mačiūnas D. Multi-objective global optimization of grillages using genetic algorithms. [Doctoral Dissertation]. Vilnius Gediminas Technical University; 2013. Available from: http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2013~D_20130614_152610-90019 ;
 3. Mamčenko, Jelena. Data mining technologies for distributed servers' efficiency.
 Mamčenko, Jelena. “Data mining technologies for distributed servers' efficiency.” 2009. Doctoral Dissertation, Vilnius Gediminas Technical University. Accessed October 19, 2019. http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2008~D_20090105_150115-82504 ;.
 Mamčenko, Jelena. “Data mining technologies for distributed servers' efficiency.” 2009. Web. 19 Oct 2019.
 Mamčenko J. Data mining technologies for distributed servers' efficiency. [Internet] [Doctoral dissertation]. Vilnius Gediminas Technical University; 2009. [cited 2019 Oct 19]. Available from: http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2008~D_20090105_150115-82504 ;.
 4. Mamčenko, Jelena. Duomenų gavybos technologijų taikymas išskirstytų serverių darbui gerinti.
 Mamčenko, Jelena. “Duomenų gavybos technologijų taikymas išskirstytų serverių darbui gerinti.” 2009. Doctoral Dissertation, Vilnius Gediminas Technical University. Accessed October 19, 2019. http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2008~D_20090105_150124-79076 ;.
 Mamčenko, Jelena. “Duomenų gavybos technologijų taikymas išskirstytų serverių darbui gerinti.” 2009. Web. 19 Oct 2019.
 Mamčenko J. Duomenų gavybos technologijų taikymas išskirstytų serverių darbui gerinti. [Internet] [Doctoral dissertation]. Vilnius Gediminas Technical University; 2009. [cited 2019 Oct 19]. Available from: http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2008~D_20090105_150124-79076 ;.
 5. Drukteinienė, Asta. Nanometrų skyros judančių daugiamačių pjezorobotų trajektorijų formavimas.
 Degree: Dissertation, Informatics Engineering, 2011, Vilnius Gediminas Technical University
 URL: http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2011~D_20111207_132201-45128 ;
 Pjezoelektriniai judesio keitikliai – rezonansinės sistemos, kurių veikimo principas pagrįstas aukšto dažnio virpesių žadinimu. Disertacijoje tiriamieji pjezorobotai neturi papildomų judesį generuojančių struktūrų, o tik tiesioginius... (more)
 Pjezoelektriniai judesio keitikliai – rezonansinės sistemos, kurių veikimo principas pagrįstas aukšto dažnio virpesių žadinimu. Disertacijoje tiriamieji pjezorobotai neturi papildomų judesį generuojančių struktūrų, o tik tiesioginius kontakto su statine plokštuma taškus. Kadangi judesio trajektorija yra laužyta, klasikiniai trajektorijų formavimo metodai netinka. Pagrindinis tyrimo objektas yra judesio trajektorijų formavimo metodai. Pagrindinis disertacijos tikslas – sukurti precizinių daugiamačių pjezorobotų judesio trajektorijų formavimo algoritmus. Sukurtų algoritmų taikymo sritis – pjezorobotų judesio modeliavimo ir valdymo programinė įranga. Darbe sprendžiami šie pagrindiniai uždaviniai: pjezorobotų konstrukcijų, veikimo principų bei judesio trajektorijų formavimo metodų analizė; pjezorobotų judesio trajektorijų formavimo algoritmų kūrimas atsižvelgiant į elektrodų segmentų žadinimo schemas. Siekiant išanalizuoti sukurtais algoritmais suformuotas judesio trajektorijas, atliekamas judesio trajektorijų kiekybinių charakteristikų tyrimas. Disertaciją sudaro įvadas, trys skyriai, rezultatų apibendrinimas, naudotos literatūros ir autoriaus publikacijų disertacijos tema sąrašai ir šeši priedai. Įvadiniame skyriuje formuluojama problema, aptariamas darbo aktualumas, aprašomas tyrimų objektas, formuluojamas darbo tikslas bei uždaviniai, aprašoma tyrimų metodika, darbo mokslinis naujumas, darbo rezultatų praktinė reikšmė, ginamieji teiginiai. Įvado pabaigoje pristatomos... [toliau žr. visą tekstą]
 Piezoelectric actuators are resonance systems operating principles based on high-frequency oscillations excitation, are used in structures of robots. Observed piezorobots have no additional motion generating structures, but only direct contact points with the static plane. Piezorobot motion trajectory is broken lines, therefore, the classical trajectory formation methods cannot be applied. The main object is motion trajectory formation methods. The main aim of this work is to create motion trajectory formation methods for precision multidimensional piezorobots. The application of these algorithms is piezorobot motion simulation and control software. In order to achieve the objective, the following tasks had to be solved: to analysis of piezorobots designs, operating principles and methods of formation the motion trajectories; creation of motion trajectories formation methods taking into account possible electrode exciting schemes. In order to analyze shaped trajectories, study of motion trajectories of the quantitative characteristics was performed. The dissertation consists of four parts including Introduction, 3 chapters, Conclusions, References, list of the author’s scientific publica-tions on the topic of dissertation and six appendixes . The introduction reveals the investigated problem, importance of the thesis and the object of research and describes the purpose and tasks of the paper, research methodology, scientific novelty, the practical significance of results... [to full text]
 Advisors/Committee Members: Kulvietis, Genadijus (Doctoral dissertation supervisor), Čenys, Antanas (Doctoral dissertation committee chair), Navakauskas, Dalius (Doctoral dissertation committee member), Simutis, Rimvydas (Doctoral dissertation committee member), Turla, Vytautas (Doctoral dissertation committee member), Vasiljevas, Piotras (Doctoral dissertation committee member), Barauskas, Rimantas (Doctoral dissertation opponent), Giniotis, Vytautas (Doctoral dissertation opponent).
 Subjects/Keywords: Trajektorijų formavimas; Algoritmai; Pjezorobotai; Trajectories formation; Algorithms; Piezorobots
 Drukteinienė, A. (2011). Nanometrų skyros judančių daugiamačių pjezorobotų trajektorijų formavimas . (Doctoral Dissertation). Vilnius Gediminas Technical University. Retrieved from http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2011~D_20111207_132201-45128 ;
 Drukteinienė, Asta. “Nanometrų skyros judančių daugiamačių pjezorobotų trajektorijų formavimas.” 2011. Doctoral Dissertation, Vilnius Gediminas Technical University. Accessed October 19, 2019. http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2011~D_20111207_132201-45128 ;.
 Drukteinienė, Asta. “Nanometrų skyros judančių daugiamačių pjezorobotų trajektorijų formavimas.” 2011. Web. 19 Oct 2019.
 Drukteinienė A. Nanometrų skyros judančių daugiamačių pjezorobotų trajektorijų formavimas. [Internet] [Doctoral dissertation]. Vilnius Gediminas Technical University; 2011. [cited 2019 Oct 19]. Available from: http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2011~D_20111207_132201-45128 ;.
 Drukteinienė A. Nanometrų skyros judančių daugiamačių pjezorobotų trajektorijų formavimas. [Doctoral Dissertation]. Vilnius Gediminas Technical University; 2011. Available from: http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2011~D_20111207_132201-45128 ;
 6. Drukteinienė, Asta. Trajectories Formation for Mobile Multidimensional Piezorobots with Nanometer Resolution.
 Degree: PhD, Informatics Engineering, 2011, Vilnius Gediminas Technical University
 URL: http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2011~D_20111207_132209-56061 ;
 Piezoelectric actuators are resonance systems operating principles based on high-frequency oscillations excitation, are used in structures of robots. Observed piezorobots have no additional motion generating... (more)
 Piezoelectric actuators are resonance systems operating principles based on high-frequency oscillations excitation, are used in structures of robots. Observed piezorobots have no additional motion generating structures, but only direct contact points with the static plane. Piezorobot motion trajectory is broken lines, therefore, the classical trajectory formation methods cannot be applied. The main object is motion trajectory formation methods. The main aim of this work is to create motion trajectory formation methods for precision multidimensional piezorobots. The application of these algorithms is piezorobot motion simulation and control software.
 Pjezoelektriniai judesio keitikliai – rezonansinės sistemos, kurių veikimo principas pagrįstas aukšto dažnio virpesių žadinimu. Disertacijoje tiriamieji pjezorobotai neturi papildomų judesį generuojančių struktūrų, o tik tiesioginius kontakto su statine plokštuma taškus. Kadangi judesio trajektorija yra laužyta, klasikiniai trajektorijų formavimo metodai netinka. Pagrindinis tyrimo objektas yra judesio trajektorijų formavimo metodai. Pagrindinis disertacijos tikslas – sukurti precizinių daugiamačių pjezorobotų judesio trajektorijų formavimo algoritmus. Sukurtų algoritmų taikymo sritis – pjezorobotų judesio modeliavimo ir valdymo programinė įranga.
 Subjects/Keywords: Trajectory generation; Piezorobot; Algorithm; Trajektorijos formavimas; Pjezorobotas; Algoritmas
 Drukteinienė, A. (2011). Trajectories Formation for Mobile Multidimensional Piezorobots with Nanometer Resolution . (Doctoral Dissertation). Vilnius Gediminas Technical University. Retrieved from http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2011~D_20111207_132209-56061 ;
 Drukteinienė, Asta. “Trajectories Formation for Mobile Multidimensional Piezorobots with Nanometer Resolution.” 2011. Doctoral Dissertation, Vilnius Gediminas Technical University. Accessed October 19, 2019. http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2011~D_20111207_132209-56061 ;.
 Drukteinienė, Asta. “Trajectories Formation for Mobile Multidimensional Piezorobots with Nanometer Resolution.” 2011. Web. 19 Oct 2019.
 Drukteinienė A. Trajectories Formation for Mobile Multidimensional Piezorobots with Nanometer Resolution. [Internet] [Doctoral dissertation]. Vilnius Gediminas Technical University; 2011. [cited 2019 Oct 19]. Available from: http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2011~D_20111207_132209-56061 ;.
 Drukteinienė A. Trajectories Formation for Mobile Multidimensional Piezorobots with Nanometer Resolution. [Doctoral Dissertation]. Vilnius Gediminas Technical University; 2011. Available from: http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2011~D_20111207_132209-56061 ;
 7. Jakušev, Aleksandr. Development, analysis and applications of the technology for parallelization of numerical algorithms for solution of PDE and systems of PDEs.
 Degree: PhD, Informatics Engineering, 2008, Vilnius Gediminas Technical University
 URL: http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2008~D_20080620_093226-42047 ;
 The new parallelization technology is presented in this work. The technology is suitable for parallelization of linear algebra problems that arise during solution of PDE... (more)
 Subjects/Keywords: PDE; Parallelization; Parallel algorithms; C++; MPI; Diferencialinės lygtys ir jų sistemos; Lygiagretinimas; Lygiagretieji algoritmai; C++; MPI
 Jakušev, Aleksandr. (2008). Development, analysis and applications of the technology for parallelization of numerical algorithms for solution of PDE and systems of PDEs . (Doctoral Dissertation). Vilnius Gediminas Technical University. Retrieved from http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2008~D_20080620_093226-42047 ;
 Jakušev, Aleksandr. “Development, analysis and applications of the technology for parallelization of numerical algorithms for solution of PDE and systems of PDEs.” 2008. Doctoral Dissertation, Vilnius Gediminas Technical University. Accessed October 19, 2019. http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2008~D_20080620_093226-42047 ;.
 Jakušev, Aleksandr. “Development, analysis and applications of the technology for parallelization of numerical algorithms for solution of PDE and systems of PDEs.” 2008. Web. 19 Oct 2019.
 Jakušev, Aleksandr. Development, analysis and applications of the technology for parallelization of numerical algorithms for solution of PDE and systems of PDEs. [Internet] [Doctoral dissertation]. Vilnius Gediminas Technical University; 2008. [cited 2019 Oct 19]. Available from: http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2008~D_20080620_093226-42047 ;.
 Jakušev, Aleksandr. Development, analysis and applications of the technology for parallelization of numerical algorithms for solution of PDE and systems of PDEs. [Doctoral Dissertation]. Vilnius Gediminas Technical University; 2008. Available from: http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2008~D_20080620_093226-42047 ;
 8. Šešok, Dmitrij. Santvarų topologijos optimizavimas genetiniais algoritmais.
 Degree: Dissertation, Mechanical Engineering, 2008, Vilnius Gediminas Technical University
 URL: http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2008~D_20080723_095306-36540 ;
 Disertacijoje nagrinėjamos santvarų globalaus optimizavimo problemos. Pagrindinis darbo tikslas – sukurti technologiją ir ją aprašančius algoritmus santvarų topologijos optimizavimui ir sinchroniniam topologijos ir formos optimizavimui.... (more)
 Disertacijoje nagrinėjamos santvarų globalaus optimizavimo problemos. Pagrindinis darbo tikslas – sukurti technologiją ir ją aprašančius algoritmus santvarų topologijos optimizavimui ir sinchroniniam topologijos ir formos optimizavimui. Optimizavimui naudojami genetiniai algoritmai. Topologijai optimizuoti pasirinkta perdėtai sujungtos struktūros strategija (angl. ground structure approach).
 The dissertation deals with the topology optimization problems of the truss systems. The main aim of the work is to create a technology and implementing algorithms for topology optimization and for simultaneous topology and shape optimization of truss systems. The genetic algorithms are used as the main tool for optimization. The topology optimization problems are formulated using the so-called ground structure approach.
 Advisors/Committee Members: Belevičius, Rimantas (Doctoral dissertation supervisor), Atkočiūnas, Juozas (Doctoral dissertation opponent), Barauskas, Rimantas (Doctoral dissertation opponent), Kačianauskas, Rimantas (Doctoral dissertation committee chair), Čiegis, Raimondas (Doctoral dissertation committee member), Toločka, Rymantas Tadas (Doctoral dissertation committee member), Vekteris, Vladas (Doctoral dissertation committee member), Žilinskas, Julius (Doctoral dissertation committee member).
 Subjects/Keywords: Genetiniai algoritmai; Santvarų topologijos optimizavimas; Globalusis optimizavimas; Genetic algorithms; Topology optimization of truss structures; Global optimization
 Šešok, Dmitrij. (2008). Santvarų topologijos optimizavimas genetiniais algoritmais . (Doctoral Dissertation). Vilnius Gediminas Technical University. Retrieved from http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2008~D_20080723_095306-36540 ;
 Šešok, Dmitrij. “Santvarų topologijos optimizavimas genetiniais algoritmais.” 2008. Doctoral Dissertation, Vilnius Gediminas Technical University. Accessed October 19, 2019. http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2008~D_20080723_095306-36540 ;.
 Šešok, Dmitrij. “Santvarų topologijos optimizavimas genetiniais algoritmais.” 2008. Web. 19 Oct 2019.
 Šešok, Dmitrij. Santvarų topologijos optimizavimas genetiniais algoritmais. [Internet] [Doctoral dissertation]. Vilnius Gediminas Technical University; 2008. [cited 2019 Oct 19]. Available from: http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2008~D_20080723_095306-36540 ;.
 Šešok, Dmitrij. Santvarų topologijos optimizavimas genetiniais algoritmais. [Doctoral Dissertation]. Vilnius Gediminas Technical University; 2008. Available from: http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2008~D_20080723_095306-36540 ;
 9. Šešok, Dmitrij. Topology optimization of truss structures using genetic algorithms.
 Degree: PhD, Mechanical Engineering, 2008, Vilnius Gediminas Technical University
 URL: http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2008~D_20080723_095430-52584 ;
 The dissertation deals with the topology optimization problems of the truss systems. The main aim of the work is to create a technology and implementing... (more)
 Subjects/Keywords: Genetic algorithms; Topology optimization of truss structures; Global optimization; Genetiniai algoritmai; Santvarų topologijos optimizavimas; Globalusis optimizavimas
 Šešok, Dmitrij. (2008). Topology optimization of truss structures using genetic algorithms . (Doctoral Dissertation). Vilnius Gediminas Technical University. Retrieved from http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2008~D_20080723_095430-52584 ;
 Šešok, Dmitrij. “Topology optimization of truss structures using genetic algorithms.” 2008. Doctoral Dissertation, Vilnius Gediminas Technical University. Accessed October 19, 2019. http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2008~D_20080723_095430-52584 ;.
 Šešok, Dmitrij. “Topology optimization of truss structures using genetic algorithms.” 2008. Web. 19 Oct 2019.
 Šešok, Dmitrij. Topology optimization of truss structures using genetic algorithms. [Internet] [Doctoral dissertation]. Vilnius Gediminas Technical University; 2008. [cited 2019 Oct 19]. Available from: http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2008~D_20080723_095430-52584 ;.
 Šešok, Dmitrij. Topology optimization of truss structures using genetic algorithms. [Doctoral Dissertation]. Vilnius Gediminas Technical University; 2008. Available from: http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2008~D_20080723_095430-52584 ;
 10. Lieponienė, Jurgita. E. mokymosi rezultatų vertinimo technologijų tyrimas.
 Degree: Dissertation, Informatics Engineering, 2012, Vilnius Gediminas Technical University
 URL: http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2012~D_20120723_105120-72711 ;
 Disertacijoje nagrinėjamos e. mokymosi rezultatų vertinimo problemos, aukštojo mokslo kaitos kontekste. Pagrindinis tyrimo objektas yra automatinis pažymių konvertavimas iš vienos vertinimo skalės į kitą. Šis... (more)
 Disertacijoje nagrinėjamos e. mokymosi rezultatų vertinimo problemos, aukštojo mokslo kaitos kontekste. Pagrindinis tyrimo objektas yra automatinis pažymių konvertavimas iš vienos vertinimo skalės į kitą. Šis objektas yra svarbus įgyvendinant Bolonijos proceso nuostatas. Pagrindinis disertacijos tikslas – sukurti vertinimų automatinio konvertavimo iš vienos vertinimo skalės į kitą modelius. Darbe sprendžiami keli pagrindiniai uždaviniai: atlikti tyrimų e. mokymosi rezultatų vertinimo technologijų srityje analizę; išanalizuoti studijų rezultatų modelius ir sistemas; sukurti vertinimų konvertavimo iš vienos vertinimo skalės į kitą modelius ir juos realizuojančius algoritmus; atlikti sukurtų vertinimo konvertavimo modelių eksperimentinį tyrimą; integruoti vertinimų konvertavimo modelį į e. mokymosi sistemą. Įvadiniame skyriuje aptariama tiriamoji problema, darbo aktualumas, aprašomas tyrimų objektas, formuluojamas darbo tikslas bei uždaviniai, aprašoma tyrimų metodika, darbo mokslinis naujumas, darbo rezultatų praktinė reikšmė, ginamieji teiginiai. Įvado pabaigoje pristatomos disertacijos tema autoriaus paskelbtos publikacijos ir pranešimai konferencijose bei disertacijos struktūra. Pirmasis skyrius skirtas literatūros apžvalgai. Jame pateikta tyrimų e. mokymosi rezultatų vertinimo technologijų srityje analizė, pagrindžiamas nagrinėjamos temos aktualumas. Skyriaus pabaigoje formuluojamos išvados. Antrajame skyriuje pateikta įvairių šalių studijų rezultatų vertinimo sistemų... [toliau žr. visą tekstą]
 The doctoral thesis analyses the issues of the grading of e-learning results in the context of higher education changes. The main object of analysis is the automatic conversion of grades from one grading scale to another. The doctoral thesis mainly aims at developing the models of automatic grades conversion from one grading scale to another. The following main objectives are solved in the thesis: analysis of researches performed in the area of technologies of e-learning results grading; performance of analysis of models and grading systems of study results; development of the models of grading conversion from one grading scale to another as well as the algorithms, implementing such models; experimental analysis of developed grading conversion models; integration of developed grading conversion model into e-learning system. The introduction discusses analyzed problem, relevance of work, description of analysis object, formulation of the aim and objectives of thesis, description of research methodology, the scientific novelty of work, practical significance of work results and defensive statements. The first section is dedicated to the review of literature sources. It includes the analysis of researches in the area of e-learning results grading technology and justification of the relevancy of analyzed topic. The second section provides the analysis of grading systems of studies results in various countries, the ECTS grading scale is analyzed and the issues of the application... [to full text]
 Advisors/Committee Members: KULVIETIENĖ, Regina (Doctoral dissertation supervisor), NAVAKAUSKAS, Dalius (Doctoral dissertation committee chair), BARAUSKAS, Rimantas (Doctoral dissertation committee member), MAŽEIKA, Dalius (Doctoral dissertation committee member), RYBOKAS, Mindaugas (Doctoral dissertation committee member), SIMUTIS, Rimvydas (Doctoral dissertation committee member), DZEMYDIENĖ, Dalė (Doctoral dissertation opponent), KAKLAUSKAS, Artūras (Doctoral dissertation opponent).
 Subjects/Keywords: E. mokymosi rezultatų vertinimo technologijos; Automatinis vertinimų konvertavimas; Dviparametris modelis; Triparametris modelis; E-learning results' assessment technologies; Automatic conversion of grades; Two-parameter model; Three-parameter model
 Lieponienė, J. (2012). E. mokymosi rezultatų vertinimo technologijų tyrimas . (Doctoral Dissertation). Vilnius Gediminas Technical University. Retrieved from http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2012~D_20120723_105120-72711 ;
 Lieponienė, Jurgita. “E. mokymosi rezultatų vertinimo technologijų tyrimas.” 2012. Doctoral Dissertation, Vilnius Gediminas Technical University. Accessed October 19, 2019. http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2012~D_20120723_105120-72711 ;.
 Lieponienė, Jurgita. “E. mokymosi rezultatų vertinimo technologijų tyrimas.” 2012. Web. 19 Oct 2019.
 Lieponienė J. E. mokymosi rezultatų vertinimo technologijų tyrimas. [Internet] [Doctoral dissertation]. Vilnius Gediminas Technical University; 2012. [cited 2019 Oct 19]. Available from: http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2012~D_20120723_105120-72711 ;.
 Lieponienė J. E. mokymosi rezultatų vertinimo technologijų tyrimas. [Doctoral Dissertation]. Vilnius Gediminas Technical University; 2012. Available from: http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2012~D_20120723_105120-72711 ;
 11. Lieponienė, Jurgita. The research of e-learning results’ assessment technologies.
 URL: http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2012~D_20120723_105140-43964 ;
 The doctoral thesis analyses the issues of the grading of e-learning results in the context of higher education changes. The main object of analysis is... (more)
 Subjects/Keywords: E-learning results’ assessment technologies; The automatic conversion of assessments; Two-parameter model; Three-parameter model; E. mokymosi rezultatų vertinimo technologijos; Automatinis vertinimų konvertavimas; Dviparametris modelis; Triparametris modelis
 Lieponienė, J. (2012). The research of e-learning results’ assessment technologies . (Doctoral Dissertation). Vilnius Gediminas Technical University. Retrieved from http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2012~D_20120723_105140-43964 ;
 Lieponienė, Jurgita. “The research of e-learning results’ assessment technologies.” 2012. Doctoral Dissertation, Vilnius Gediminas Technical University. Accessed October 19, 2019. http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2012~D_20120723_105140-43964 ;.
 Lieponienė, Jurgita. “The research of e-learning results’ assessment technologies.” 2012. Web. 19 Oct 2019.
 Lieponienė J. The research of e-learning results’ assessment technologies. [Internet] [Doctoral dissertation]. Vilnius Gediminas Technical University; 2012. [cited 2019 Oct 19]. Available from: http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2012~D_20120723_105140-43964 ;.
 Lieponienė J. The research of e-learning results’ assessment technologies. [Doctoral Dissertation]. Vilnius Gediminas Technical University; 2012. Available from: http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2012~D_20120723_105140-43964 ;
 12. Belevičiūtė, Inga. A system architecture centred on knowledge management processes.
 URL: http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2008~D_20081121_133824-88348 ;
 The thesis “A system architecture centred on knowledge management processes” consists of these chapters: 1. Introduction. 2. Knowledge management and knowledge management tools. 3. Analysis... (more)
 The thesis “A system architecture centred on knowledge management processes” consists of these chapters: 1. Introduction. 2. Knowledge management and knowledge management tools. 3. Analysis of knowledge management systems, their architectures and solutions. 4. A system architecture centred on knowledge management processes. 5. Knowledge management implementations in organizations. 6. General conclusions. The introduction chapter covers relevance, tasks, object, scientific novelty and practical value of the research, and work approbation in international conferences. The first chapter presents knowledge management definitions discussed by many authors in academia and industry. To enter into this subject, knowledge determinations and interpretations widely discussed in literature are analysed. Later, tasks which knowledge management solves in organizations and tools which help to put it into practice are discussed. In the second chapter architectures of knowledge management systems suggested by other researchers in literature are investigated. Thereafter, a classification of them and an investigation of examples of such systems or solutions are made. After the analysis of knowledge management discipline and existing knowledge management system architectures, an architecture for knowledge management systems which is knowledge management processes centred is suggested in the third chapter. Then, specifications of information and communication technologies which could be used for... [to full text]
 Disertaciją Sistemos architektūra, grindžiamos žinių valdymo procesais sudaro šie skyriai: 1. Įvadas. 2. Žinių valdymas bei žinių valdymo technologijos. 3. Žinių valdymo sistemų ir jų architektūrų analizė. 4. Sistemos architektūra, grindžiamos žinių valdymo procesais. 5. Žinių valdymo sistemos taikymas organizacijose. 6. Bendrosios išvados. Įvadas apima tyrimo aktualumą, mokslinį naujumą, darbo tikslus ir uždavinius, praktinę tyrimo vertę bei aprobavimą tarptautinėse konferencijose ir seminaruose. Pirmame skyriuje „Žinių valdymas ir žinių valdymo technologijos“ pateikiamas žinių valdymo sąvokos apibrėžimas, apie kurį diskutuoja daugelis autorių, dirbančių mokslo ir pramonės srityse. Žinių valdymas pradedamas nagrinėti nuo žinių apibrėžimo ir jo interpretavimo, plačiai aptariamo literatūroje. Tuomet pereinama prie priemonių, padedančių įdiegti žinių valdymą praktikoje. Antrame skyriuje „Žinių valdymo sistemų ir jų architektūrų analizė“ analizuojamos kitų tyrėjų veikaluose siūlomos žinių valdymo sistemų architektūros. Klasifikuojami ir tiriami tokių sistemų arba sprendimų pavyzdžiai, suskirstant juos į komercinius ir atvirojo kodo šaltinius. Išanalizavus egzistuojančias žinių valdymo sistemų architektūras, trečiame skyriuje „Sistemos architektūra, grindžiamos žinių valdymo procesais“ siūloma žinių valdymo sistemos architektūra, sutelkta į žinių valdymo procesus. Tuomet apibūdinamos informacinės ir komunikacinės technologijos, kurias galima taikyti kiekvienam žinių valdymo... [toliau žr. visą tekstą]
 Advisors/Committee Members: Kulvietienė, Regina (Doctoral dissertation supervisor), Adomėnas, Petras Gailutis (Doctoral dissertation committee chair), Barauskas, Rimantas (Doctoral dissertation committee member), Navakauskas, Dalius (Doctoral dissertation committee member), Paliulis, Narimantas (Doctoral dissertation committee member), Simutis, Rimvydas (Doctoral dissertation committee member), Dzemydienė, Dalė (Doctoral dissertation opponent), Mažeika, Dalius (Doctoral dissertation opponent).
 Subjects/Keywords: Knowledge management; Knowledge management system architecture; Knowledge management processes; Žinių valdymas; Žinių valdymo sistemos architektūra; Žinių valdymo procesai
 Belevičiūtė, I. (2008). A system architecture centred on knowledge management processes . (Doctoral Dissertation). Vilnius Gediminas Technical University. Retrieved from http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2008~D_20081121_133824-88348 ;
 Belevičiūtė, Inga. “A system architecture centred on knowledge management processes.” 2008. Doctoral Dissertation, Vilnius Gediminas Technical University. Accessed October 19, 2019. http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2008~D_20081121_133824-88348 ;.
 Belevičiūtė, Inga. “A system architecture centred on knowledge management processes.” 2008. Web. 19 Oct 2019.
 Belevičiūtė I. A system architecture centred on knowledge management processes. [Internet] [Doctoral dissertation]. Vilnius Gediminas Technical University; 2008. [cited 2019 Oct 19]. Available from: http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2008~D_20081121_133824-88348 ;.
 Belevičiūtė I. A system architecture centred on knowledge management processes. [Doctoral Dissertation]. Vilnius Gediminas Technical University; 2008. Available from: http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2008~D_20081121_133824-88348 ;
 13. Belevičiūtė, Inga. Sistemos architektūra, grindžiama žinių valdymo procesais.
 URL: http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2008~D_20081121_133832-10095 ;
 Disertaciją Sistemos architektūra, grindžiamos žinių valdymo procesais sudaro šie skyriai: 1. Įvadas. 2. Žinių valdymas bei žinių valdymo technologijos. 3. Žinių valdymo sistemų ir jų... (more)
 Advisors/Committee Members: KULVIETIENĖ , Regina (Doctoral dissertation supervisor), ADOMĖNAS , Petras Gailutis (Doctoral dissertation committee chair), BARAUSKAS , Rimantas (Doctoral dissertation committee member), NAVAKAUSKAS , Dalius (Doctoral dissertation committee member), PALIULIS , Narimantas Kazimieras (Doctoral dissertation committee member), SIMUTIS , Rimvydas (Doctoral dissertation committee member), DZEMYDIENĖ , Dalė (Doctoral dissertation opponent), MAŽEIKA , Dalius (Doctoral dissertation opponent).
 Subjects/Keywords: Žinių valdymas; Žinių valdymo sistema; Žinių valdymo sistemos architektūra; Žinių valdymo procesai; Knowledge management; Knowledge management system; Knowledge management system architecture; Knowledge management processes
 Belevičiūtė, I. (2008). Sistemos architektūra, grindžiama žinių valdymo procesais . (Doctoral Dissertation). Vilnius Gediminas Technical University. Retrieved from http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2008~D_20081121_133832-10095 ;
 Belevičiūtė, Inga. “Sistemos architektūra, grindžiama žinių valdymo procesais.” 2008. Doctoral Dissertation, Vilnius Gediminas Technical University. Accessed October 19, 2019. http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2008~D_20081121_133832-10095 ;.
 Belevičiūtė, Inga. “Sistemos architektūra, grindžiama žinių valdymo procesais.” 2008. Web. 19 Oct 2019.
 Belevičiūtė I. Sistemos architektūra, grindžiama žinių valdymo procesais. [Internet] [Doctoral dissertation]. Vilnius Gediminas Technical University; 2008. [cited 2019 Oct 19]. Available from: http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2008~D_20081121_133832-10095 ;.
 Belevičiūtė I. Sistemos architektūra, grindžiama žinių valdymo procesais. [Doctoral Dissertation]. Vilnius Gediminas Technical University; 2008. Available from: http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2008~D_20081121_133832-10095 ;
 14. Maknickas, Algirdas. Deformuojamo erdvinio kūno tampriųjų savybių modeliavimas diskrečiųjų elementų metodu.
 Degree: Dissertation, Mechanical Engineering, 2009, Vilnius Gediminas Technical University
 URL: http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2009~D_20090713_142112-78540 ;
 Tobulėjant skaitiniams metodams ir kompiuterinei technikai atsivėrė galimybė naujų, sudėtingesnių mechaninių objektų modeliavimui. Turėdami naujus sudėtingesnių objektų modelius tyrėjai gali pritaikyti aprašytas ir sumodeliuotas šių... (more)
 Tobulėjant skaitiniams metodams ir kompiuterinei technikai atsivėrė galimybė naujų, sudėtingesnių mechaninių objektų modeliavimui. Turėdami naujus sudėtingesnių objektų modelius tyrėjai gali pritaikyti aprašytas ir sumodeliuotas šių objektų savybes su mikro struktūros ypatumais esamų ar busimų savybių nustatymui bei naujų medžiagų kūrimui. Tam intensyviai naudojami kaip eksperimentiniai taip ir skaitiniai metodai, kurių tobulinimui šiuo metu yra skiriamas labai didelis dėmesys. Skaitinis eksperimentas, kaip medžiagos tyrimo būdas pasitelkiamas dar ir todėl kad yra pigesnis ir leidžia interpretuoti jau žinomus eksperimentų rezultatus, o taip suteikia žinių naujiems tyrimams. Vienas iš metodų, kuris modeliuoja makroskopines medžiagų savybes remdamasis medžiagos mikro savybėmis yra diskrečiųjų elementų metodas (DEM). DEM metodas remiasi idėja, kad bet kokia fizikinė struktūra gali būti aprašyta kaip judančių dalelių sistema. Ši idėja pradėta taikyti ir vientisam deformuojamam kūnui aprašyti. Skirtingai nuo biriųjų medžiagų, vientiso kūno dalelės ir tarp jų egzistuojančios sąveikos yra kitokios prigimties, o jų modeliai yra fizikinės ir matematinės abstrakcijos rezultatas. Vientiso deformuojamo kūno modeliavimas diskrečiais elementais yra tik pradinėje stadijoje, o vientiso požiūrio į diskrečių elementų modelius dar nėra. Yra kelios hipotetinės versijos, grindžiamos skirtingais požiūriais. Taikant DEM kūnui, pirmas žingsnis būtu tampriųjų savybių modeliavimas. Tai yra aktuali... [toliau žr. visą tekstą]
 Development of numerical methods and computation environments opened the possibility of new, more sophisticated mechanical objects modelling. In this context it is natural desire of the researchers to describe macroscopic mechanical characteristics of the materials by their microstructure, which can be adapted for simulation of the existing and future materials. For this purpose researchers are using intensively experimental and numerical methods for the development of which the highest priority is given. Numerical experiments are used because they are cheaper and allow the interpretation of already known results of experiments and provide information to new investigations. One of the methods used for modelling of macroscopic properties modelling is based on microscopic properties of material is discrete element method (DEM). The DEM traditionally was applied for the granular materials. The basic idea of DEM is that any physical structure could be described as a system of moving particles. This idea could be also applied to the description of solid deformable body. Particles forming solid body and existing interaction between them are of different nature than the granular materials because their models are often the result of physical and mathematical abstraction. The modelling of solid deformable body with the discrete elements is just at the initial stage and the unified approach to discrete elements models doesn’t exist. There are several versions of models, based on... [to full text]
 Advisors/Committee Members: Kačianauskas, Rimantas (Doctoral dissertation advisor), Belevičius, Rimantas (Doctoral dissertation committee chair), Antonovič, Valentin (Doctoral dissertation committee member), Barauskas, Rimantas (Doctoral dissertation committee member), Bubulis, Algimantas (Doctoral dissertation committee member), Kulvietis, Genadijus (Doctoral dissertation committee member), Atkočiūnas, Juozas (Doctoral dissertation opponent), Tornau, Evaldas (Doctoral dissertation opponent).
 Subjects/Keywords: Kietas kūnas; Tamprumo modulis; Diskrečiųjų elementų metodas; Solids; Elasticity modulus; Discrete element method
 Maknickas, A. (2009). Deformuojamo erdvinio kūno tampriųjų savybių modeliavimas diskrečiųjų elementų metodu . (Doctoral Dissertation). Vilnius Gediminas Technical University. Retrieved from http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2009~D_20090713_142112-78540 ;
 Maknickas, Algirdas. “Deformuojamo erdvinio kūno tampriųjų savybių modeliavimas diskrečiųjų elementų metodu.” 2009. Doctoral Dissertation, Vilnius Gediminas Technical University. Accessed October 19, 2019. http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2009~D_20090713_142112-78540 ;.
 Maknickas, Algirdas. “Deformuojamo erdvinio kūno tampriųjų savybių modeliavimas diskrečiųjų elementų metodu.” 2009. Web. 19 Oct 2019.
 Maknickas A. Deformuojamo erdvinio kūno tampriųjų savybių modeliavimas diskrečiųjų elementų metodu. [Internet] [Doctoral dissertation]. Vilnius Gediminas Technical University; 2009. [cited 2019 Oct 19]. Available from: http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2009~D_20090713_142112-78540 ;.
 Maknickas A. Deformuojamo erdvinio kūno tampriųjų savybių modeliavimas diskrečiųjų elementų metodu. [Doctoral Dissertation]. Vilnius Gediminas Technical University; 2009. Available from: http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2009~D_20090713_142112-78540 ;
 15. Maknickas, Algirdas. Modelling of elasticity properties of solids by the discrete element method.
 Degree: PhD, Mechanical Engineering, 2009, Vilnius Gediminas Technical University
 URL: http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2009~D_20090713_142127-91304 ;
 Development of numerical methods and computation environments opened the possibility of new, more sophisticated mechanical objects modelling. In this context it is natural desire of... (more)
 Subjects/Keywords: Solids; Elasticity modulus; Discrete element method; Kietas kūnas; Tamprumo modulis; Diskrečiųjų elementų metodas
 Maknickas, A. (2009). Modelling of elasticity properties of solids by the discrete element method . (Doctoral Dissertation). Vilnius Gediminas Technical University. Retrieved from http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2009~D_20090713_142127-91304 ;
 Maknickas, Algirdas. “Modelling of elasticity properties of solids by the discrete element method.” 2009. Doctoral Dissertation, Vilnius Gediminas Technical University. Accessed October 19, 2019. http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2009~D_20090713_142127-91304 ;.
 Maknickas, Algirdas. “Modelling of elasticity properties of solids by the discrete element method.” 2009. Web. 19 Oct 2019.
 Maknickas A. Modelling of elasticity properties of solids by the discrete element method. [Internet] [Doctoral dissertation]. Vilnius Gediminas Technical University; 2009. [cited 2019 Oct 19]. Available from: http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2009~D_20090713_142127-91304 ;.
 Maknickas A. Modelling of elasticity properties of solids by the discrete element method. [Doctoral Dissertation]. Vilnius Gediminas Technical University; 2009. Available from: http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2009~D_20090713_142127-91304 ;
 16. Ragauskas, Paulius. Identification Of Elastic Properties Of Layered Composite Materials.
 Degree: PhD, Mechanical Engineering, 2010, Vilnius Gediminas Technical University
 URL: http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2010~D_20101119_134738-62490 ;
 In this thesis the problems of identification accuracy of elastic properties of materials are examined. The main object of study is samples of various materials... (more)
 In this thesis the problems of identification accuracy of elastic properties of materials are examined. The main object of study is samples of various materials and their elastic properties. This is an important subject of theoretical studies of various materials. The main thesis objective is to create an effective technology for precise identification of all the elastic characteristics of the sample. The de-veloped algorithms are to be applied in the material manufacturing industry. Thesis also aims at exploring accuracy and sensitivity of the identification of elastic properties of materials. The paper deals with a number of objectives: 1) to optimize the geometric parameters of the sample striving for more accurate identification results of elas-tic properties; 2) to identify mode shapes of sample and regulate their place in spectrum of eigenvalues in order to minimize the distortion of the objective function; 3) to create the implementation algorithms of proposed technologies and verify their capabilities experimentally. The first task is formulated taking into account the relatively high level of identification error of elastic properties of composite materials. The second objective relates to distortion of the objec-tive function in the process of updating the mathematical model with the pre-sumed elastic characteristics of material. The thesis is composed of four chapters, the summary of results, the list of literature and the list of author’s publications on the topic... [to full text]
 Disertacijoje nagrinėjamos medžiagų tamprumo rodiklių identifikavimo tikslumo problemos. Pagrindinis tyrimo objektas yra įvairių medžiagų bandiniai, jų tamprumo rodikliai. Šis objektas yra svarbus įvairių medžiagų teoriniams tyrimams. Pagrindinis disertacijos tikslas yra sukurti efektyvią technologiją, leidžiančią pakankamu tikslumu surasti visus bandinio tamprumo rodiklius. Sukurtų algoritmų taikymo sritis yra medžiagų gamybos pramonė. Disertacijoje tiriamas siūlomos technologijos tikslumas ieškant įvairių medžiagų tamprumo rodiklių. Darbe sprendžiami keli pagrindiniai uždaviniai: optimizuojami bandinio geometriniai parametrai siekiant tikslesnių tamprumo rodiklių identifikavimo rezultatų; atpažįstamos bandinio modų formos ir reguliuojama jų vieta tikrinių reikšmių spektre siekiant sumažinti tikslo funkcijos iškraipymus; sukuriami pasiūlytų technologijų įgyvendinimo algoritmai ir bandymais patikrinamos jų galimybės. Pirmasis uždavinys suformuluotas atsižvelgiant į palyginti didelę kompozitinių medžiagų tamprumo rodiklių identifikavimo paklaidą. Antrasis siejasi su tikslo funkcijos iškraipymu atnaujinant matematinį medžiagos modelį spėjamais tamprumo rodikliais. Disertaciją sudaro keturi skyriai, rezultatų apibendrinimas, naudotos literatūros ir autoriaus publikacijų disertacijos tema sąrašai. Įvadiniame skyriuje aptariamas problemos aktualumas, tyrimo objektas, formuluojamas darbo tikslas bei uždaviniai, aprašoma tyrimų metodika, darbo mokslinis naujumas, darbo rezultatų... [toliau žr. visą tekstą]
 Advisors/Committee Members: Belevičius, Rimantas (Doctoral dissertation advisor), Kačianauskas, Rimantas (Doctoral dissertation committee chair), Atkočiūnas, Juozas (Doctoral dissertation committee member), Fedaravičius, Algimantas (Doctoral dissertation committee member), Leonavičius, Mindaugas Kazimieras (Doctoral dissertation committee member), Žiliukas, Antanas (Doctoral dissertation committee member), Barauskas, Rimantas (Doctoral dissertation opponent), Turla, Vytautas (Doctoral dissertation opponent).
 Subjects/Keywords: Elastic proeprties; Composites; Identification; Genetic algorithms; Optimization; Tamprumo rodikliai; Kompozitai; Identifikavimas; Genetiniai algoritmai; Optimizavimas
 Ragauskas, P. (2010). Identification Of Elastic Properties Of Layered Composite Materials . (Doctoral Dissertation). Vilnius Gediminas Technical University. Retrieved from http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2010~D_20101119_134738-62490 ;
 Ragauskas, Paulius. “Identification Of Elastic Properties Of Layered Composite Materials.” 2010. Doctoral Dissertation, Vilnius Gediminas Technical University. Accessed October 19, 2019. http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2010~D_20101119_134738-62490 ;.
 Ragauskas, Paulius. “Identification Of Elastic Properties Of Layered Composite Materials.” 2010. Web. 19 Oct 2019.
 Ragauskas P. Identification Of Elastic Properties Of Layered Composite Materials. [Internet] [Doctoral dissertation]. Vilnius Gediminas Technical University; 2010. [cited 2019 Oct 19]. Available from: http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2010~D_20101119_134738-62490 ;.
 Ragauskas P. Identification Of Elastic Properties Of Layered Composite Materials. [Doctoral Dissertation]. Vilnius Gediminas Technical University; 2010. Available from: http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2010~D_20101119_134738-62490 ;
 17. Ragauskas, Paulius. Sluoksniuotų kompozitinių medžiagų tamprumo rodiklių identifikavimas.
 Degree: Dissertation, Mechanical Engineering, 2010, Vilnius Gediminas Technical University
 URL: http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2010~D_20101119_134748-33503 ;
 Disertacijoje nagrinėjamos medžiagų tamprumo rodiklių identifikavimo tikslumo problemos. Pagrindinis tyrimo objektas yra įvairių medžiagų bandiniai, jų tamprumo rodikliai. Šis objektas yra svarbus įvairių medžiagų teoriniams... (more)
 Subjects/Keywords: Tamrpumo rodikliai; Kompozitai; Identifikavimas; Genetiniai algoritmai; Optimizavimas; Elastic properties; Composites; Identification; Genetic algorithms; Optimization
 Ragauskas, P. (2010). Sluoksniuotų kompozitinių medžiagų tamprumo rodiklių identifikavimas . (Doctoral Dissertation). Vilnius Gediminas Technical University. Retrieved from http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2010~D_20101119_134748-33503 ;
 Ragauskas, Paulius. “Sluoksniuotų kompozitinių medžiagų tamprumo rodiklių identifikavimas.” 2010. Doctoral Dissertation, Vilnius Gediminas Technical University. Accessed October 19, 2019. http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2010~D_20101119_134748-33503 ;.
 Ragauskas, Paulius. “Sluoksniuotų kompozitinių medžiagų tamprumo rodiklių identifikavimas.” 2010. Web. 19 Oct 2019.
 Ragauskas P. Sluoksniuotų kompozitinių medžiagų tamprumo rodiklių identifikavimas. [Internet] [Doctoral dissertation]. Vilnius Gediminas Technical University; 2010. [cited 2019 Oct 19]. Available from: http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2010~D_20101119_134748-33503 ;.
 Ragauskas P. Sluoksniuotų kompozitinių medžiagų tamprumo rodiklių identifikavimas. [Doctoral Dissertation]. Vilnius Gediminas Technical University; 2010. Available from: http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2010~D_20101119_134748-33503 ;
 18. Vadluga, Vaidas. Simulation of dynamic deformation and fracture behaviour of heterogeneous structures by discrete element method.
 URL: http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2008~D_20080213_082157-83281 ;
 Research area and topicality of the work. Mechanical properties and their evolution under loading are the most significant factors for the development of various mechanical... (more)
 Research area and topicality of the work. Mechanical properties and their evolution under loading are the most significant factors for the development of various mechanical structures, technologies and equipment. It seems to be natu-ral that deeper understanding of the behaviour of existing and design of new materials presents a challenge in different research areas. It should be noted, that all the materials are heterogeneous in meso- and micro- scales. They exhibit essential differences, compared to the macroscopic continuum behaviour. Basically, both experimental and numerical simulation methods are extensively applied for investigation purposes. Experimental techniques, capable of giving a realistic view of the inside of the material and extracting the real data, are very expensive. Therefore, the nu-merical simulation tools are extensively used as an alternative for investigation purposes. They have considerable advantages allowing the reproduction of multiple experiments and providing comprehensive data about ongoing phe-nomena. Recently, numerical technologies have become highly multidisciplinary subjects. They comprise phenomenological and statistical ideas, while mathe-matical models employ the relations of continuum mechanics, classical discre-tization methods and molecular dynamics. The Discrete Element Method (DEM) is one of new methods. It is aimed at simulating the dynamic behaviour of the contacting particles. Variable topology of the system of particles is an... [to full text]
 Tyrimų sritis ir darbo aktualumas. Kuriant modernias ��vairios paskirties mechanines sistemas, technologijas ir įrangą, svarbiomis tampa jas sudarančios medžiagos. Savaime suprantama, kad žinomos ir naujai kuriamos medžiagos dabar kur kas išsamiau nagrinėjamos daugelyje mokslo šakų, įskaitant ir me-džiagų mechaniką. Visos medžiagos mezo- ir mikrostruktūros požiūriu yra ne-vienalytės. Jų mikroskopinės savybės skirtingos, lyginant su įprastu kontinuu-mu. Medžiagų savybėms tirti dažniausiai taikomi eksperimentiniai metodai. Eksperimentiniais metodais ištirti medžiagos struktūras ir jose vykstančius procesus ir įvertinti tam tikras jų savybes labai brangu. Tai viena priežasčių, kodėl skaitinis modeliavimas tampa realia tyrimų alternatyva. Skaitinį eksperi-mentą galima kartoti daug kartų, valdant bandinio parametrus, išlaikant tas pa-čias sąlygas, ir stebėti reiškiniui būdingus rodiklius visame tūryje. Šiuolaikiniai modeliavimo metodai yra kompleksiniai. Jie jungia fenome-nologines ir statistines idėjas, o matematiniai modeliai sudaromi taikant konti-nuumo mechanikos ir jų diskrečiųjų modelių bei molekulinės dinamikos pri-klausomybes. Diskrečiųjų elementų metodas (DEM) taip pat priskiriamas šiuo-laikinių metodų kategorijai. Jis skirtas kontaktuojančių dalelių sistemų dinami-niam modeliavimui. Kintanti dalelių sistemos topologija – būdingas metodo požymis. Pastaruoju metu DEM jau taikomas kontinuumui modeliuoti ir praktikoje aktualiems irimo uždaviniams spręsti. Reikia pastebėti,... [toliau žr. visą tekstą]
 Advisors/Committee Members: Kačianauskas, Rimantas (Doctoral dissertation supervisor), Džiugys, Algis (Doctoral dissertation advisor), Belevičius, Rimantas (Doctoral dissertation committee chair), Balevičius, Robertas (Doctoral dissertation committee member), Daunys, Mykolas (Doctoral dissertation committee member), Dzemyda, Gintautas (Doctoral dissertation committee member), Leonavičius, Mindaugas Kazimieras (Doctoral dissertation committee member), Atkočiūnas, Juozas (Doctoral dissertation opponent), Barauskas, Rimantas (Doctoral dissertation opponent).
 Subjects/Keywords: DEM; FEM; Dynamic deformation; Brittle fracture; DEM; BEM; Dinaminis deformavimas; Trapus irimas
 Vadluga, Vaidas. (2008). Simulation of dynamic deformation and fracture behaviour of heterogeneous structures by discrete element method . (Doctoral Dissertation). Vilnius Gediminas Technical University. Retrieved from http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2008~D_20080213_082157-83281 ;
 Vadluga, Vaidas. “Simulation of dynamic deformation and fracture behaviour of heterogeneous structures by discrete element method.” 2008. Doctoral Dissertation, Vilnius Gediminas Technical University. Accessed October 19, 2019. http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2008~D_20080213_082157-83281 ;.
 Vadluga, Vaidas. “Simulation of dynamic deformation and fracture behaviour of heterogeneous structures by discrete element method.” 2008. Web. 19 Oct 2019.
 Vadluga, Vaidas. Simulation of dynamic deformation and fracture behaviour of heterogeneous structures by discrete element method. [Internet] [Doctoral dissertation]. Vilnius Gediminas Technical University; 2008. [cited 2019 Oct 19]. Available from: http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2008~D_20080213_082157-83281 ;.
 Vadluga, Vaidas. Simulation of dynamic deformation and fracture behaviour of heterogeneous structures by discrete element method. [Doctoral Dissertation]. Vilnius Gediminas Technical University; 2008. Available from: http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2008~D_20080213_082157-83281 ;
 19. Vadluga, Vaidas. Nevienalyčių struktūrų dinaminio deformavimo ir irimo modeliavimas diskrečiųjų elementų metodu.
 URL: http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2008~D_20080213_082217-82695 ;
 Tyrimų sritis ir darbo aktualumas. Kuriant modernias įvairios paskirties mechanines sistemas, technologijas ir įrangą, svarbiomis tampa jas sudarančios medžiagos. Savaime suprantama, kad žinomos ir naujai... (more)
 Tyrimų sritis ir darbo aktualumas. Kuriant modernias įvairios paskirties mechanines sistemas, technologijas ir įrangą, svarbiomis tampa jas sudarančios medžiagos. Savaime suprantama, kad žinomos ir naujai kuriamos medžiagos dabar kur kas išsamiau nagrinėjamos daugelyje mokslo šakų, įskaitant ir me-džiagų mechaniką. Visos medžiagos mezo- ir mikrostruktūros požiūriu yra ne-vienalytės. Jų mikroskopinės savybės skirtingos, lyginant su įprastu kontinuu-mu. Medžiagų savybėms tirti dažniausiai taikomi eksperimentiniai metodai. Eksperimentiniais metodais ištirti medžiagos struktūras ir jose vykstančius procesus ir įvertinti tam tikras jų savybes labai brangu. Tai viena priežasčių, kodėl skaitinis modeliavimas tampa realia tyrimų alternatyva. Skaitinį eksperi-mentą galima kartoti daug kartų, valdant bandinio parametrus, išlaikant tas pa-čias sąlygas, ir stebėti reiškiniui būdingus rodiklius visame tūryje. Šiuolaikiniai modeliavimo metodai yra kompleksiniai. Jie jungia fenome-nologines ir statistines idėjas, o matematiniai modeliai sudaromi taikant konti-nuumo mechanikos ir jų diskrečiųjų modelių bei molekulinės dinamikos pri-klausomybes. Diskrečiųjų elementų metodas (DEM) taip pat priskiriamas šiuo-laikinių metodų kategorijai. Jis skirtas kontaktuojančių dalelių sistemų dinami-niam modeliavimui. Kintanti dalelių sistemos topologija – būdingas metodo požymis. Pastaruoju metu DEM jau taikomas kontinuumui modeliuoti ir praktikoje aktualiems irimo uždaviniams spręsti. Reikia pastebėti,... [toliau žr. visą tekstą]
 Advisors/Committee Members: Kačianauskas, Rimantas (Doctoral dissertation supervisor), Džiugys, Algis (Doctoral dissertation advisor), Balevičius, Robertas (Doctoral dissertation committee member), Belevičius, Rimantas (Doctoral dissertation committee chair), Daunys, Mykolas (Doctoral dissertation committee member), Dzemyda, Gintautas (Doctoral dissertation committee member), Atkočiūnas, Juozas (Doctoral dissertation opponent), Barauskas, Rimantas (Doctoral dissertation opponent), Leonavičius, Mindaugas Kazimieras (Doctoral dissertation committee member).
 Subjects/Keywords: Diskrečiųjų elementų metodas; Nevienalytės struktūros; Tamprus dinaminis deformavimas; Trapus irimas; Discrete element method; Heterogeneous structure; Elastic dynamic deformation; Brittle fracture
 Vadluga, Vaidas. (2008). Nevienalyčių struktūrų dinaminio deformavimo ir irimo modeliavimas diskrečiųjų elementų metodu . (Doctoral Dissertation). Vilnius Gediminas Technical University. Retrieved from http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2008~D_20080213_082217-82695 ;
 Vadluga, Vaidas. “Nevienalyčių struktūrų dinaminio deformavimo ir irimo modeliavimas diskrečiųjų elementų metodu.” 2008. Doctoral Dissertation, Vilnius Gediminas Technical University. Accessed October 19, 2019. http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2008~D_20080213_082217-82695 ;.
 Vadluga, Vaidas. “Nevienalyčių struktūrų dinaminio deformavimo ir irimo modeliavimas diskrečiųjų elementų metodu.” 2008. Web. 19 Oct 2019.
 Vadluga, Vaidas. Nevienalyčių struktūrų dinaminio deformavimo ir irimo modeliavimas diskrečiųjų elementų metodu. [Internet] [Doctoral dissertation]. Vilnius Gediminas Technical University; 2008. [cited 2019 Oct 19]. Available from: http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2008~D_20080213_082217-82695 ;.
 Vadluga, Vaidas. Nevienalyčių struktūrų dinaminio deformavimo ir irimo modeliavimas diskrečiųjų elementų metodu. [Doctoral Dissertation]. Vilnius Gediminas Technical University; 2008. Available from: http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2008~D_20080213_082217-82695 ;
 20. Jasevičius, Raimondas. The Numerical Modelling of Normal Interaction of Ultrafine Particles.
 Degree: PhD, Mechanical Engineering, 2011, Vilnius Gediminas Technical University
 URL: http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2010~D_20110224_161120-06365 ;
 Recently, powders of the size d (0.1 μm < d < 10 μm) have been referred to ultrafine particles. The particle shape considered is assumed... (more)
 Recently, powders of the size d (0.1 μm < d < 10 μm) have been referred to ultrafine particles. The particle shape considered is assumed to be a sphere of the diameter d. The handling of powders is of great importance for processing of pharmaceuticals, cement, chemicals and other products. Most of these technological processes involve powder compaction, storage, transportation, mixing, etc, therefore, understanding of the fundamentals of particles interaction behaviour is very essential in the design of machines and equipment as well as in powder technology, cleaning of environment and other areas. The dynamic behaviour of particulate systems is very complicated due to the complex interactions between individual particles and their interaction with the surroundings. Understanding the underlying mechanisms can be effectively achieved via particle scale research. The problem of a normal contact may be resolved in a number of ways. In spite of huge progress in experimental techniques, direct lab tests with individual particles are still rather time-consuming and expensive. The interaction of particles as solid bodies is actually a classical problem of contact mechanics. In the case of ultrafine particles, the reduction of the particle size shifts the contact zones into the nanoscale or subnanoscale. Thus, steadily increasing contribution of adhesion has to be considered in the development of the physically correct constitutive models and numerical tools. Consequently, it may be... [to full text]
 Ultrasmulkios dalelės yra šiuolaikinės chemijos, farmacijos, maisto ir kitų pramonės šakų produktų sudėtinė dalis. Tiriant pramoninius technologinius procesus, neišvengiamai reikalingos teorinės žinios apie ultrasmulkių dalelių elgseną. Išsamus supratimas įmanomas tik atlikus įvairius tyrimus. Pastaruoju metu milteliai, klasifikuojami kaip ultrasmulkios (0,1 < d < 10 μm) dalelės, imti plačiai naudoti pramoniniuose procesuose, todėl suprasti ultrasmulkių dalelių elgsenos fundamentalumą miltelių technologijoje yra labai svarbu. Ultrasmulki dalelė yra itin maža, todėl su ja atlikti fizinį eksperimentą, kuris reikalauja specialios įrangos bei žinių, labai sunku. Tokiu atveju dažniausiai naudojamas skaitinis eksperimentas, kurį galima atlikti virtualiai. Skaitinio eksperimento metu yra tiriamos dinaminės ultrasmulkios dalelės savybės bei sprendžiamas dinaminis uždavinys. Taikant skaitinius modelius bei dalelės judėjimą aprašančias jėgų lygtis, naudojami sąveikos modeliai, apimantys adhezinę, klampią, tamprią bei tampriai plastinę sąveikas. Mikroskopinis adhezinės sąveikos modeliavimas – aktualus mechanikos mokslo uždavinys. Taikant sąveikos modelius, svarbu pritaikyti ir diskrečiųjų elementų metodą, kadangi, norint aprašyti dalelių elgseną, visų pirma reikia su-vokti ir aprašyti dalelės modelį. Dalelės elgsenos skaitiniam modeliavimui siūlomi teoriniai modeliai leidžia tirti dalelės sąveiką su dalele ar tampria puserdve bei sąveikos dinamiką. Šie modeliai galėtų būti pritaikyti ir... [toliau žr. visą tekstą]
 Advisors/Committee Members: Kačianauskas, Rimantas (Doctoral dissertation supervisor), Markauskas, Darius (Doctoral dissertation advisor), Leonavičius, Mindaugas Kazimieras (Doctoral dissertation committee chair), Balevičius, Robertas (Doctoral dissertation committee member), Balevičius, Saulius (Doctoral dissertation committee member), Barauskas, Rimantas (Doctoral dissertation committee member), Bogdevičius, Marijonas (Doctoral dissertation committee member), Džiugys, Algis (Doctoral dissertation opponent), Turla, Vytautas (Doctoral dissertation opponent).
 Subjects/Keywords: Elastic-plastic contact of ultrafine particle; Adhesion; Energy dissipation; Discrete element method; Coefficient of restitution; Ultrasmulkios dalelės tampriai plastinis kontaktas; Adhezija; Energijos sklaida; Diskrečiųjų elementų metodas; Atsistatymo koeficientas
 Jasevičius, R. (2011). The Numerical Modelling of Normal Interaction of Ultrafine Particles . (Doctoral Dissertation). Vilnius Gediminas Technical University. Retrieved from http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2010~D_20110224_161120-06365 ;
 Jasevičius, Raimondas. “The Numerical Modelling of Normal Interaction of Ultrafine Particles.” 2011. Doctoral Dissertation, Vilnius Gediminas Technical University. Accessed October 19, 2019. http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2010~D_20110224_161120-06365 ;.
 Jasevičius, Raimondas. “The Numerical Modelling of Normal Interaction of Ultrafine Particles.” 2011. Web. 19 Oct 2019.
 Jasevičius R. The Numerical Modelling of Normal Interaction of Ultrafine Particles. [Internet] [Doctoral dissertation]. Vilnius Gediminas Technical University; 2011. [cited 2019 Oct 19]. Available from: http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2010~D_20110224_161120-06365 ;.
 Jasevičius R. The Numerical Modelling of Normal Interaction of Ultrafine Particles. [Doctoral Dissertation]. Vilnius Gediminas Technical University; 2011. Available from: http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2010~D_20110224_161120-06365 ;
 21. Baravykaitė, Milda Marija. Lygiagrečiųjų algoritmų šablonų tyrimas ir kūrimas.
 Degree: Dissertation, Informatics Engineering, 2006, Vilnius Gediminas Technical University
 URL: http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2006~D_20060710_151037-11447 ;
 ► Parallel computations are used in many areas where large computation amounts are required and/or faster response is critical. The development of parallel algorithms and parallel... (more)
 ▼ Parallel computations are used in many areas where large computation amounts are required and/or faster response is critical. The development of parallel algorithms and parallel programming are complicated and require additional knowledge. To ease the parallel programming and algorithm parallelization many tools are developed. One class of such tools is algorithm templates. The idea of algorithm templates is to separate the problem specific and general parts of the algorithm. The general part can be implemented as a reusable module. The problem specific part of the algorithm should be implemented by the user. When these ideas are used for parallel programming, the template has to specify the main parts of the parallel algorithm: partitioning, communications, mapping, synchronization. Master – slave algorithms are very popular and widely used in parallel programming. It is efficient both for homogeneous and heterogeneous parallel computers. Parallelization tools of master – slave algorithms using popular communication libraries are useful. Many problems of engineering, economics and other fields are formulated as optimization problems. Optimization problems are often complicated and computation intensive. Therefore the creation of automatic parallelization tools of popular branch and bound optimization algorithms is relevant. Grillage type foundations are popular in case of weak grounds. It consists of beams that are supported by piles or reside on other beams. In order to... [to full text] Advisors/Committee Members: Mockus, Jonas (Doctoral dissertation committee member), Baušys, Romualdas (Doctoral dissertation committee member), Barauskas, Rimantas (Doctoral dissertation committee member), Dementjev, Aleksandr (Doctoral dissertation opponent), Baronas, Romas (Doctoral dissertation committee member), Dzemyda, Gintatutas (Doctoral dissertation committee chair), Vasilecas, Olegas (Doctoral dissertation opponent).
 Subjects/Keywords: Polinių pamatų optimizavimas; Lygiagretieji algoritmai; Šakų ir rėžių; Šeimininkas - darbininkai; Šablonai
 Baravykaitė, M. M. (2006). Lygiagrečiųjų algoritmų šablonų tyrimas ir kūrimas . (Doctoral Dissertation). Vilnius Gediminas Technical University. Retrieved from http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2006~D_20060710_151037-11447 ;
 Baravykaitė, Milda Marija. “Lygiagrečiųjų algoritmų šablonų tyrimas ir kūrimas.” 2006. Doctoral Dissertation, Vilnius Gediminas Technical University. Accessed October 19, 2019. http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2006~D_20060710_151037-11447 ;.
 Baravykaitė, Milda Marija. “Lygiagrečiųjų algoritmų šablonų tyrimas ir kūrimas.” 2006. Web. 19 Oct 2019.
 Baravykaitė MM. Lygiagrečiųjų algoritmų šablonų tyrimas ir kūrimas. [Internet] [Doctoral dissertation]. Vilnius Gediminas Technical University; 2006. [cited 2019 Oct 19]. Available from: http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2006~D_20060710_151037-11447 ;.
 Baravykaitė MM. Lygiagrečiųjų algoritmų šablonų tyrimas ir kūrimas. [Doctoral Dissertation]. Vilnius Gediminas Technical University; 2006. Available from: http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2006~D_20060710_151037-11447 ;
 22. Baravykaitė, Milda Marija. Lygiagrečiųjų algoritmų šablonų tyrimas ir kūrimas.
 Degree: PhD, Informatics Engineering, 2006, Vilnius Gediminas Technical University
 URL: http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2006~D_20060712_091845-57089 ;
 Daugelyje mokslo sričių susiduriama su uždaviniais, kuriuos išspręsti esamais kompiuteriais užtruktų nepriimtinai ilgai arba neįmanoma dėl tų uždavinių dydžio ir skaičiavimų apimties. Lygiagrečiaisiais skaičiavimais siekiame... (more)
 Daugelyje mokslo sričių susiduriama su uždaviniais, kuriuos išspręsti esamais kompiuteriais užtruktų nepriimtinai ilgai arba neįmanoma dėl tų uždavinių dydžio ir skaičiavimų apimties. Lygiagrečiaisiais skaičiavimais siekiame spręsti uždavinius greičiau, arba spręsti didesnius uždavinius. Tačiau tiek lygiagrečiųjų algoritmų sudarymas, tiek jų programinis realizavimas yra sudėtingi procesai, reikalaujantys daug žinių ir įgūdžių. Taupant laiką ir pastangas, yra kuriami lygiagretinimo įrankiai, lengvinantys įvairių lygiagrečiųjų programų ar metodikų naudojimą. Šeimininkas – darbininkai algoritmai yra dažnai naudojami ir paplitę įvairiose lygiagrečiųjų skaičiavimų srityse. Lygiagrečiųjų ���eimininkas – darbininkai algoritmų programų kūrimo automatizavimas palengvina daugelio uždavinių sprendimą. Šeimininkas – darbininkai algoritmas efektyvus vykdant tiek homogeniniuose, tiek heterogeniniuose lygiagrečiuosiuose kompiuteriuose. Duomenims tarp procesorių perduoti naudojamos duomenų perdavimo bibliotekos sparčiai vystomos. Nemažai anksčiau kurtų lygiagretinimo įrankių naudoja PVM duomenų perdavimo biblioteką. Išpopuliarėjus MPI duomenų perdavimo bibliotekai aktualu pritaikyti įrankius jos naudojimui. Daug praktinių uždavinių gali būti formuluojami kaip optimizavimo uždaviniai. Daugelis optimizavimo uždavinių sudėtingi ir reikalaujantys daug skaičiavimų. Šakų ir rėžių algoritmo principai taikomi kuriant tikslius ir euristinius algoritmus optimizavimo uždavinių sprendimui. Optimizavimo... [to full text]
 Parallel computations are used in many areas where large computation amounts are required and/or faster response is critical. The development of parallel algorithms and parallel programming are complicated and require additional knowledge. To ease the parallel programming and algorithm parallelization many tools are developed. One class of such tools is algorithm templates. The idea of algorithm templates is to separate the problem specific and general parts of the algorithm. The general part can be implemented as a reusable module. The problem specific part of the algorithm should be implemented by the user. When these ideas are used for parallel programming, the template has to specify the main parts of the parallel algorithm: partitioning, communications, mapping, synchronization. Master – slave algorithms are very popular and widely used in parallel programming. It is efficient both for homogeneous and heterogeneous parallel computers. Parallelization tools of master – slave algorithms using popular communication libraries are useful. Many problems of engineering, economics and other fields are formulated as optimization problems. Optimization problems are often complicated and computation intensive. Therefore the creation of automatic parallelization tools of popular branch and bound optimization algorithms is relevant. Grillage type foundations are popular in case of weak grounds. It consists of beams that are supported by piles or reside on other beams. In order to... [to full text]
 Advisors/Committee Members: Dementjev, Aleksandr (Doctoral dissertation opponent), Vasilecas, Olegas (Doctoral dissertation opponent), Barauskas, Rimantas (Doctoral dissertation committee member), Mockus, Jonas (Doctoral dissertation committee member), Baronas, Romas (Doctoral dissertation committee member), Dzemyda, Gintatutas (Doctoral dissertation committee chair), Baušys, Romualdas (Doctoral dissertation committee member).
 Subjects/Keywords: Šablonai; Lygiagretieji algoritmai; Šeimininkas - darbininkai; Patterns; Parallel algorithms; Master - workers
 Baravykaitė, M. M. (2006). Lygiagrečiųjų algoritmų šablonų tyrimas ir kūrimas . (Doctoral Dissertation). Vilnius Gediminas Technical University. Retrieved from http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2006~D_20060712_091845-57089 ;
 Baravykaitė, Milda Marija. “Lygiagrečiųjų algoritmų šablonų tyrimas ir kūrimas.” 2006. Doctoral Dissertation, Vilnius Gediminas Technical University. Accessed October 19, 2019. http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2006~D_20060712_091845-57089 ;.
 Baravykaitė MM. Lygiagrečiųjų algoritmų šablonų tyrimas ir kūrimas. [Internet] [Doctoral dissertation]. Vilnius Gediminas Technical University; 2006. [cited 2019 Oct 19]. Available from: http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2006~D_20060712_091845-57089 ;.
 Baravykaitė MM. Lygiagrečiųjų algoritmų šablonų tyrimas ir kūrimas. [Doctoral Dissertation]. Vilnius Gediminas Technical University; 2006. Available from: http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2006~D_20060712_091845-57089 ;
 23. Stupak, Eugeniuš. Dvimačių struktūrų irimo modeliavimas naudojant prisitaikančiuosius baigtinių elementų tinklus.
 Degree: Dissertation, Mechanical Engineering, 2004, Vilnius Gediminas Technical University
 URL: http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2004~D_20041111_085744-71834 ;
 ► In this work the h-adaptive FE strategy for solving 2D problems of fracture mechanics is developed and applicated. The stress indicator employed in the adaptive... (more)
 ▼ In this work the h-adaptive FE strategy for solving 2D problems of fracture mechanics is developed and applicated. The stress indicator employed in the adaptive analysis is able to capture high gradients of stress in the vicinity of the defect. Performance of this technique is checked against the defects of different geometry. Finally the above-mentioned technique exposes its suitability for solving fracture problems. Advisors/Committee Members: Daunys, Mykolas (Doctoral dissertation committee member), Atkočiūnas, Juozas (Doctoral dissertation opponent), Leonavičius, Mindaugas (Doctoral dissertation committee chair), Kaklauskas, Gintaris (Doctoral dissertation committee member), Kačianauskas, Rimantas (Doctoral dissertation supervisor), Barauskas, Rimantas (Doctoral dissertation opponent), Belevičius, Rimantas (Doctoral dissertation committee member), Dundulis, Gintautas (Doctoral dissertation committee member).
 Subjects/Keywords: Adaptive finite element meshes; Irimas; Fracture; Prisitaikantieji baigtinių elementų tinklai
 Stupak, Eugeniuš. (2004). Dvimačių struktūrų irimo modeliavimas naudojant prisitaikančiuosius baigtinių elementų tinklus . (Doctoral Dissertation). Vilnius Gediminas Technical University. Retrieved from http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2004~D_20041111_085744-71834 ;
 Stupak, Eugeniuš. “Dvimačių struktūrų irimo modeliavimas naudojant prisitaikančiuosius baigtinių elementų tinklus.” 2004. Doctoral Dissertation, Vilnius Gediminas Technical University. Accessed October 19, 2019. http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2004~D_20041111_085744-71834 ;.
 Stupak, Eugeniuš. “Dvimačių struktūrų irimo modeliavimas naudojant prisitaikančiuosius baigtinių elementų tinklus.” 2004. Web. 19 Oct 2019.
 Stupak, Eugeniuš. Dvimačių struktūrų irimo modeliavimas naudojant prisitaikančiuosius baigtinių elementų tinklus. [Internet] [Doctoral dissertation]. Vilnius Gediminas Technical University; 2004. [cited 2019 Oct 19]. Available from: http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2004~D_20041111_085744-71834 ;.
 Stupak, Eugeniuš. Dvimačių struktūrų irimo modeliavimas naudojant prisitaikančiuosius baigtinių elementų tinklus. [Doctoral Dissertation]. Vilnius Gediminas Technical University; 2004. Available from: http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2004~D_20041111_085744-71834 ;
 24. Stupak, Eugeniuš. Dvimačių struktūrų irimo modeliavimas naudojant prisitaikančiuosius baigtinių elementų tinklus.
 Degree: PhD, Mechanical Engineering, 2004, Vilnius Gediminas Technical University
 URL: http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2004~D_20041112_115243-41376 ;
 ► This summary of doctoral dissertation deal with modeling of fracture in various 2D structures. The standard experimental specimens with defects, which are used in evaluation... (more)
 ▼ This summary of doctoral dissertation deal with modeling of fracture in various 2D structures. The standard experimental specimens with defects, which are used in evaluation of fracture parameters, are investigated numerically in this work. The original FE generation technique based on the adaptive approach is developed for the 2D structures with defects. The stress indicator employed in the adaptive analysis is able to capture high gradients of stress in the vicinity of the defect. Performance of this technique is checked against the defects of different geometry. Finally the above-mentioned technique exposes its suitability for solving fracture problems. Advisors/Committee Members: Kaklauskas, Gintaris (Doctoral dissertation committee member), Barauskas, Rimantas (Doctoral dissertation opponent), Leonavičius, Mindaugas (Doctoral dissertation committee chair), Daunys, Mykolas (Doctoral dissertation committee member), Kačianauskas, Rimantas (Doctoral dissertation supervisor), Belevičius, Rimantas (Doctoral dissertation committee member), Atkočiūnas, Juozas (Doctoral dissertation opponent), Dundulis, Gintautas (Doctoral dissertation committee member).
 Subjects/Keywords: Adaptive finite element meshes; Prisitaikantieji baigtinių elementų tinklai; Fracture; Irimas
 Stupak, Eugeniuš. (2004). Dvimačių struktūrų irimo modeliavimas naudojant prisitaikančiuosius baigtinių elementų tinklus . (Doctoral Dissertation). Vilnius Gediminas Technical University. Retrieved from http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2004~D_20041112_115243-41376 ;
 Stupak, Eugeniuš. “Dvimačių struktūrų irimo modeliavimas naudojant prisitaikančiuosius baigtinių elementų tinklus.” 2004. Doctoral Dissertation, Vilnius Gediminas Technical University. Accessed October 19, 2019. http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2004~D_20041112_115243-41376 ;.
 Stupak, Eugeniuš. Dvimačių struktūrų irimo modeliavimas naudojant prisitaikančiuosius baigtinių elementų tinklus. [Internet] [Doctoral dissertation]. Vilnius Gediminas Technical University; 2004. [cited 2019 Oct 19]. Available from: http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2004~D_20041112_115243-41376 ;.
 Stupak, Eugeniuš. Dvimačių struktūrų irimo modeliavimas naudojant prisitaikančiuosius baigtinių elementų tinklus. [Doctoral Dissertation]. Vilnius Gediminas Technical University; 2004. Available from: http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2004~D_20041112_115243-41376 ;
 25. Vojevodina, Dovilė. E-verslo procesų nukrypimų valdymo modeliavimas darbų sekų metodu.
 Degree: Dissertation, Informatics Engineering, 2007, Vilnius Gediminas Technical University
 URL: http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2007~D_20070206_154454-58795 ;
 ► The introduction of the dissertation gives a short overview of the scope of the research. The first chapter discusses the ways and methods of business... (more)
 ▼ The introduction of the dissertation gives a short overview of the scope of the research. The first chapter discusses the ways and methods of business process modelling and gives summary on exception types and their nature. The second chapter discusses in detail the exception models, occurring in e-business processes. The third chapter describes the results of the research on handling exceptions in B2C environment. The last, fourth, chapter discusses the method of handling exceptions in B2B environment. At the end of the research the general conclusions are made. Advisors/Committee Members: Simutis, Rimvydas (Doctoral dissertation committee member), Dzemydienė, Dalė (Doctoral dissertation committee member), Mažeika, Dalius (Doctoral dissertation committee member), Kulvietis, Genadijus (Doctoral dissertation supervisor), Kaklauskas, Artūras (Doctoral dissertation opponent), Adomėnas, Petras Gailutis (Doctoral dissertation committee chair), Baušys, Romualdas (Doctoral dissertation committee member), Barauskas, Rimantas (Doctoral dissertation opponent).
 Subjects/Keywords: Workflow; Darbų sekos; E-verslas; Verslo procesai; Business process; Exception; E-business; Nukrypimai
 Vojevodina, D. (2007). E-verslo procesų nukrypimų valdymo modeliavimas darbų sekų metodu . (Doctoral Dissertation). Vilnius Gediminas Technical University. Retrieved from http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2007~D_20070206_154454-58795 ;
 Vojevodina, Dovilė. “E-verslo procesų nukrypimų valdymo modeliavimas darbų sekų metodu.” 2007. Doctoral Dissertation, Vilnius Gediminas Technical University. Accessed October 19, 2019. http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2007~D_20070206_154454-58795 ;.
 Vojevodina, Dovilė. “E-verslo procesų nukrypimų valdymo modeliavimas darbų sekų metodu.” 2007. Web. 19 Oct 2019.
 Vojevodina D. E-verslo procesų nukrypimų valdymo modeliavimas darbų sekų metodu. [Internet] [Doctoral dissertation]. Vilnius Gediminas Technical University; 2007. [cited 2019 Oct 19]. Available from: http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2007~D_20070206_154454-58795 ;.
 Vojevodina D. E-verslo procesų nukrypimų valdymo modeliavimas darbų sekų metodu. [Doctoral Dissertation]. Vilnius Gediminas Technical University; 2007. Available from: http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2007~D_20070206_154454-58795 ;
 26. Vojevodina, Dovilė. E-Verslo procesų nukrypimų valdymo modeliavimas darbų sekų metodu.
 Degree: PhD, Informatics Engineering, 2007, Vilnius Gediminas Technical University
 URL: http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2007~D_20070302_152145-10390 ;
 ► The introduction gives a short overview of the scope of the research. The first chapter discusses the ways and methods of business process modelling and... (more)
 ▼ The introduction gives a short overview of the scope of the research. The first chapter discusses the ways and methods of business process modelling and gives summary on exception types and their nature. The second chapter discusses in detail the exception models, occurring in e-business processes. The third chapter describes the results of the research on handling exceptions in B2C environment. The last, fourth, chapter discusses the method of handling exceptions in B2B environment. At the end of the research the general conclusions are made. Advisors/Committee Members: Barauskas, Rimantas (Doctoral dissertation opponent), Adomėnas, Petras Gailutis (Doctoral dissertation committee chair), Mažeika, Dalius (Doctoral dissertation committee member), Baušys, Romualdas (Doctoral dissertation committee member), Kaklauskas, Artūras (Doctoral dissertation opponent), Dzemydienė, Dalė (Doctoral dissertation committee member), Kulvietis, Genadijus (Doctoral dissertation supervisor), Simutis, Rimvydas (Doctoral dissertation committee member).
 Subjects/Keywords: Nukrypimas; E-verslas; Business process; E-business; Workflow; Verslo procesai; Exception; Darbų sekos
 Vojevodina, D. (2007). E-Verslo procesų nukrypimų valdymo modeliavimas darbų sekų metodu . (Doctoral Dissertation). Vilnius Gediminas Technical University. Retrieved from http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2007~D_20070302_152145-10390 ;
 Vojevodina, Dovilė. “E-Verslo procesų nukrypimų valdymo modeliavimas darbų sekų metodu.” 2007. Doctoral Dissertation, Vilnius Gediminas Technical University. Accessed October 19, 2019. http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2007~D_20070302_152145-10390 ;.
 Vojevodina D. E-Verslo procesų nukrypimų valdymo modeliavimas darbų sekų metodu. [Internet] [Doctoral dissertation]. Vilnius Gediminas Technical University; 2007. [cited 2019 Oct 19]. Available from: http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2007~D_20070302_152145-10390 ;.
 Vojevodina D. E-Verslo procesų nukrypimų valdymo modeliavimas darbų sekų metodu. [Doctoral Dissertation]. Vilnius Gediminas Technical University; 2007. Available from: http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2007~D_20070302_152145-10390 ;
 27. Vasiliauskienė, Lina. Prisitaikančiosios baigtinių elementų strategijos plokštuminiams tamprumo teorijos uždaviniams.
 Degree: Dissertation, Mechanical Engineering, 2006, Vilnius Gediminas Technical University
 URL: http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2006~D_20060622_134743-74080 ;
 ► The advent of modern computer technologies provided a powerful tool in numerical simulations. One of the most frequently used method for the discretization of the... (more)
 ▼ The advent of modern computer technologies provided a powerful tool in numerical simulations. One of the most frequently used method for the discretization of the physical domain is Finite element Method (FEM). One of the main problems in a finite element analysis is the adequacy of the finite element mesh. Since the quality of the finite element solution directly depends on the quality of meshes, the additional process to improve the quality of meshes is necessary for reliable finite element approximation. In order to perform quality-assessed numerical simulation, the adaptive finite element strategies have been developed. These strategies integrate the finite element analysis with error estimation and fully automatic mesh modification, user interaction with this process is limited by initial geometry data and possible error tolerance definition. The finite element solution, obtained during adaptive finite element strategy process, approximates quite good different engineering structures. Despite many works in this area the problem of the adequate finite element mesh is not fully solved and additional developments are needed in order to improve adaptive mesh refinement strategy process. The aim and tasks of the work – to obtain methodology for quality assessed discretization to finite elements for complex geometry engineering structures by adaptive finite element strategies. To realize this purpose the following scientific tasks have been dealt: to develop an automatic... [to full text] Advisors/Committee Members: Dzemyda, Gintautas (Doctoral dissertation committee member), Kulvietis, Genadijus (Doctoral dissertation committee member), Barauskas, Rimantas (Doctoral dissertation opponent), Leonavičius, Mindaugas Kazimieras (Doctoral dissertation committee chair), Kačianauskas, Rimantas (Doctoral dissertation opponent), Atkočiūnas, Juozas (Doctoral dissertation committee member), Ivanauskas, Feliksas (Doctoral dissertation committee member).
 Subjects/Keywords: Tinklo optimalumo kriterijai; Mesh optimality criteria; Baigtiniai elementai; Singular points; Finite elements; Adaptive strategies; Prisitaikančiosios strategijos; Singuliarūs taškai
 Vasiliauskienė, L. (2006). Prisitaikančiosios baigtinių elementų strategijos plokštuminiams tamprumo teorijos uždaviniams . (Doctoral Dissertation). Vilnius Gediminas Technical University. Retrieved from http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2006~D_20060622_134743-74080 ;
 Vasiliauskienė, Lina. “Prisitaikančiosios baigtinių elementų strategijos plokštuminiams tamprumo teorijos uždaviniams.” 2006. Doctoral Dissertation, Vilnius Gediminas Technical University. Accessed October 19, 2019. http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2006~D_20060622_134743-74080 ;.
 Vasiliauskienė, Lina. “Prisitaikančiosios baigtinių elementų strategijos plokštuminiams tamprumo teorijos uždaviniams.” 2006. Web. 19 Oct 2019.
 Vasiliauskienė L. Prisitaikančiosios baigtinių elementų strategijos plokštuminiams tamprumo teorijos uždaviniams. [Internet] [Doctoral dissertation]. Vilnius Gediminas Technical University; 2006. [cited 2019 Oct 19]. Available from: http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2006~D_20060622_134743-74080 ;.
 Vasiliauskienė L. Prisitaikančiosios baigtinių elementų strategijos plokštuminiams tamprumo teorijos uždaviniams. [Doctoral Dissertation]. Vilnius Gediminas Technical University; 2006. Available from: http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2006~D_20060622_134743-74080 ;
 28. Vasiliauskienė, Lina. Prisitaikančiosios baigtinių elementų strategijos plokštuminiams tamprumo teorijos uždaviniams.
 Degree: PhD, Mechanical Engineering, 2006, Vilnius Gediminas Technical University
 URL: http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2006~D_20060623_094658-90290 ;
 ▼ The advent of modern computer technologies provided a powerful tool in numerical simulations. One of the most frequently used method for the discretization of the physical domain is Finite element Method (FEM). One of the main problems in a finite element analysis is the adequacy of the finite element mesh. Since the quality of the finite element solution directly depends on the quality of meshes, the additional process to improve the quality of meshes is necessary for reliable finite element approximation. In order to perform quality-assessed numerical simulation, the adaptive finite element strategies have been developed. These strategies integrate the finite element analysis with error estimation and fully automatic mesh modification, user interaction with this process is limited by initial geometry data and possible error tolerance definition. The finite element solution, obtained during adaptive finite element strategy process, approximates quite good different engineering structures. Despite many works in this area the problem of the adequate finite element mesh is not fully solved and additional developments are needed in order to improve adaptive mesh refinement strategy process. The aim and tasks of the work – to obtain methodology for quality assessed discretization to finite elements for complex geometry engineering structures by adaptive finite element strategies. To realize this purpose the following scientific tasks have been dealt: to develop an automatic... [to full text] Advisors/Committee Members: Leonavičius, Mindaugas Kazimieras (Doctoral dissertation committee chair), Dzemyda, Gintautas (Doctoral dissertation committee member), Atkočiūnas, Juozas (Doctoral dissertation committee member), Kulvietis, Genadijus (Doctoral dissertation committee member), Ivanauskas, Feliksas (Doctoral dissertation committee member), Barauskas, Rimantas (Doctoral dissertation opponent), Kačianauskas, Rimantas (Doctoral dissertation opponent).
 Subjects/Keywords: Prisitaikančiosios strategijos; Baigtiniai elementai; Adaptive strategies; Mesh optimality criteria; Tinklo optimalumo kriterijai; Singular points; Singuliarūs taškai; Finite elements
 Vasiliauskienė, L. (2006). Prisitaikančiosios baigtinių elementų strategijos plokštuminiams tamprumo teorijos uždaviniams . (Doctoral Dissertation). Vilnius Gediminas Technical University. Retrieved from http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2006~D_20060623_094658-90290 ;
 Vasiliauskienė, Lina. “Prisitaikančiosios baigtinių elementų strategijos plokštuminiams tamprumo teorijos uždaviniams.” 2006. Doctoral Dissertation, Vilnius Gediminas Technical University. Accessed October 19, 2019. http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2006~D_20060623_094658-90290 ;.
 Vasiliauskienė L. Prisitaikančiosios baigtinių elementų strategijos plokštuminiams tamprumo teorijos uždaviniams. [Internet] [Doctoral dissertation]. Vilnius Gediminas Technical University; 2006. [cited 2019 Oct 19]. Available from: http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2006~D_20060623_094658-90290 ;.
 Vasiliauskienė L. Prisitaikančiosios baigtinių elementų strategijos plokštuminiams tamprumo teorijos uždaviniams. [Doctoral Dissertation]. Vilnius Gediminas Technical University; 2006. Available from: http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2006~D_20060623_094658-90290 ;