Auswahl der wissenschaftlichen Literatur zum Thema „Eliptická metoda“

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Zeitschriftenartikel zum Thema "Eliptická metoda"

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Latifah, Ummu Wachidatul, und Puguh Wahyu Prasetyo. „IMPLEMENTASI KRIPTOGRAFI KURVA ELIPTIK ELGAMAL DI LAPANGAN GALOIS PRIMA PADA PROSES ENKRIPSI DAN DEKRIPSI BERBANTUAN SOFTWARE PYTHON“. Journal of Fundamental Mathematics and Applications (JFMA) 4, Nr. 1 (01.07.2021): 45–60. http://dx.doi.org/10.14710/jfma.v4i1.9278.

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Perkembangan teknologi memberikan dampak terhadap kemajuan di segala bidang kehidupan manusia terutama dalam bidang informasi. Hal ini memberikan dampak positif dan negatif. Salah satu dampak positifnya adalah mudahnya bertukar informasi dari yang bersifat umum atau rahasia melalui internet. Dampak negatifnya adalah data yang bersifat rahasia menjadi kurang aman dan dapat disalahgunakan oleh pihak yang tidak berwenang. Kriptografi kurva eliptik El-Gamal (ECC: Eliptic Curve Cryptosystem) memberikan solusi untuk keamanan suatu informasi. ECC merupakan salah satu metode kriptografi kunci publik yang mempunyai tingkat keamanan tinggi dibandingkan dengan algoritma kunci publik lainnya. Tujuan dari penelitian ini adalah memahami konsep kriptografi kurva eliptik El-Gamal yang akan didefinisikan di Galois field prima. Hasil dari penelitian ini, yaitu penggunaan kurva eliptik El-Gamal di Galois field prima untuk proses pembentukan kunci, proses enkripsi dan proses dekripsi pada suatu data dengan menggunakan Python.
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Samuel Urath, Jakobus Nifanngelyau und Jakobus Dasmasela. „Pembelajaran Matematika Realistik Berbasis Kepulauan pada Tanjung Kormomolin untuk Membuktikan Geometri Eliptik“. Jurnal Pendidikan Indonesia 2, Nr. 1 (25.01.2021): 85–94. http://dx.doi.org/10.36418/japendi.v2i1.84.

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Tujuannya untuk membuktikan geometri eliptik dan beberapa teorema-teorema dasar pada tanjung Kormomolin pada Pembelajaran Matematika Realistik (PMR), dan dapat dijadikan sebagai suatu pendekatan untuk mentransformasikan konsep matematika kepada peserta didik sehingga dipahami. Salah satunya adalah dengan memanfaatkan objek nyata dilingkungan tempat tinggal peserta didik. Salah satu objek nyata tersebut adalah Tanjung Kormomolin. Tanjung Kormomolin adalah salah satu tempat bersejarah yang terdapat di Desa Meyano Das. Metode dalam penelitian ini adalah studi pustaka yaitu mempelajari, memahami dan mengkaji mengenai buku-buku, jurnal yang relevansi dengan penelitian. Tujuannya untuk membuktikan geometri eliptik dan beberapa teorema-teorema dasar pada tanjung Kormomolin. Hasil penelitian menunjukan bahwa Tanjung Kormomolin dapat digunakan untuk membuktikan geometri eliptik baik tunggal dan ganda serta beberapa teorema dasar yang berkaitan dengan geometri eliptik secara nyata. Kesimpulannya yaitu Matematika perlu dikaitkan dengan ilmu matematika yang bersifat abstrak dan sulit dipahami oleh peserta didik. Dalam Pembelajaran Matematika Realistik peserta didik diberikan kesempatan untuk mempelajari hal-hal dalam kehidupan sehari-hari kemudian mengaitkannya dengan topik atau pembahasan dalam pelajaran matematika atau sebaliknya. Matematika perlu dikaitkan dengan ilmu matematika yang bersifat abstrak dan sulit dipahami oleh peserta didik. Dalam Pembelajaran Matematika Realistik peserta didik diberikan kesempatan untuk mempelajari hal-hal dalam kehidupan sehari-hari kemudian mengaitkannya dengan topik atau pembahasan dalam pelajaran matematika atau sebaliknya. Pada tanjung Kormomolin terdapat bentuk geometri Eliptik tunggal dan geometri Eliptik ganda yang dapat digunakan untuk membuktikan geometri Eliptik dan beberapa teorema-teorema dasar yang berlaku pada geometri Eliptik.
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Kalis, H., und I. Kangro. „FIZIKĀLU PROCESU SKAITLISKĀ MODELĒŠANA PLĀNOS SLĀŅOS“. Environment. Technology. Resources. Proceedings of the International Scientific and Practical Conference 1 (20.06.1999): 64. http://dx.doi.org/10.17770/etr1999vol1.1903.

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Apakšzemes slāņainās sistēmās fizikālie parametri vertikālā virzienā ir konstanti lielumi, kuru vērtības mainās plānos slāņos ar lēcieniem. Ņemot vērā sistēmas kārtaino struktūru, aprēķinot fizikālos lielumus (temperatūru, koncentrāciju slāņos), lieto dažāda tipa viduvēšanas [3] vai režģa metodes, izvēloties katrā slānī vismaz vienu režģa līniju [1,2]. Līdz ar to iespējams samazināt risināmās problēmas dimensitāti: paraboliskā vai eliptiskā tipa parciālā diferenciālvienādojuma vietā var risināt 1. un 2. kārtas parasto diferencālvienādojumu sistēmu. Šīs metodes ir taišņu metodes pamatā. Svarīgi ir pēc iespējas samazināt parasto diferenciālvienādojumu skaitu nepieciešamās precizitātes sasniegšanai.Viduvēšanas rezultātā katrā slānī rodas viens diferenciālvienādojums, bet režģa metodē, lietojot integrēšanu un interpolāciju vai galīgo tilpumu elementus, vismaz viens diferenciālvienādojums (1.veida robežnosacījumu gadījumā) vai 3 vienādojumi (3.veida robežnosacījumu gadījumā). Izrādās, ka ar režģa metodi var iegūt 2 diferenciālvienādojumu sistēmu, kuri jāintegrē pa dažādu vidu saskares līnijām, pie tam precizitāte ir augstāka nekā vienkāršai viduvēšanas metodei. Konstantu koeficientu gadījumā ir iespējams iegūt analītiskos atrisinājumus formulu veidā.
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Sibarani, Edy Budi Harjono, M. Zarlis und Rahmat Widya Sembiring. „ANALISIS KRIPTO SISTEM ALGORITMA AES DAN ELLIPTIC CURVE CRYPTOGRAPHY (ECC) UNTUK KEAMANAN DATA“. InfoTekJar (Jurnal Nasional Informatika dan Teknologi Jaringan) 1, Nr. 2 (07.03.2017): 106–12. http://dx.doi.org/10.30743/infotekjar.v1i2.71.

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Kriptografi merupakan salah satu solusi atau metode pengamanan data yang tepat untuk menjaga kerahasiaan dan keaslian data, serta dapat meningkatkan aspek keamanan suatu data atau informasi. Metode ini bertujuan agar informasi yang bersifat rahasia dan dikirim melalui suatu jaringan, seperti LAN atau Internet, tidak dapat diketahui atau dimanfaatkan oleh orang atau pihak yang tidak berkepentingan. Kriptografi mendukung kebutuhan dua aspek keamanan informasi, yaitu perlindungan terhadap kerahasiaan data informasi dan perlindungan terhadap pemalsuan dan pengubahan informasi yang tidak diinginkan. AES-Rinjdael merupakan salah satu algoritma kriptografi yang digunakan dalam mengamankan pesan menggunakan panjang kunci sampai 256 bit, yang mana untuk meghindari kriptanalisis, maka dilakukan metode kombinasi dengan algoritma Eliptic Curve Criptografi (ECC) dalam pengenkripsian pesan.
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Sola-LLano, Rebeca. „Material hibrido organiko-ez-organiko fluoreszenteak aplikazio optikoetarako“. EKAIA Euskal Herriko Unibertsitateko Zientzia eta Teknologia Aldizkaria, Nr. 32 (07.11.2017): 125–35. http://dx.doi.org/10.1387/ekaia.17823.

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Aplikazio optikoetarako material hibrido egokiak aurkitu nahian, koloratzaile desberdinak MgAPO-11 aluminofosfato ez-organikoan kapsulatu dira. Material zeolitiko honek AEL egitura dauka, dimentsio bakarreko nanokanal eliptiko oso estuak dituena, 6.5 x 4 Å2-ko diametrodunak; beraz, erabiliko diren koloratzaileen neurri molekularra kontuan izanik, oso estu kapsulatuak geratuko dira. Hori dela eta, koloratzailea sintesi-nahastera gehitzea beharrezkoa da kapsulatuak gera daitezen. Sintesi-metodo horren bidez koloratzaileak modu oso ordenatuan AELaren kanaletan harrapatzen dira 10 µm baino gehiagoko luzeradun partikuletan, euren ardatz molekular luzearekin kanalekiko paralelo, eta koloratzaile molekulen agregazioa saihesten da. Alde batetik, akridina (AC) eta pironina Y (PY) kromoforoak material zeolitikoan batera kapsulatu direnean, material hibrido oso fluoreszentea lortu da. Gainera, bi kromoforoen trantsizio-momentu dipolarrak bata bestearekiko perpendikularrak direnez, eta haien artean FRET energia-transferentzia eraginkorra gertatzen denez, partikulen emisio fluoreszentearen kolore-aldaketa ikus daiteke (zianetik berdera) materiala argi ultramorearekin kitzikatu ostean, bide optikoan detekzioaren aurretik koka daitezkeen polarizatzaileen norabidearen arabera. Azkenik, LDS 722 koloratzailea sartu da euskarri ez-organikoan eta emaitza gisa espektro elektromagnetikoaren alde gorrian igortzen duen material hibrido oso fluoreszentea eskuratu da. Bere etekin kuantikoa koloratzaileak disoluzio urtsuan azaltzen duena baino 50 bat aldiz altuagoa da, eta gainera, LDS 722ak optika ez-linealerako propietate intrintsekoak dituenez, eta partikuletan molekulek duten ordenamendu maila altua dela eta, material hibrido egokia lortu da bigarren harmonikoaren sorkuntzarako (SHG).
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Ashari, Arif. „POLA LORONG GUA DAN SPELEOGENESIS PADA SISTEM PERGUAAN GESING-JLAMPRONG-SINDEN KARST GUNUNGSEWU“. Geomedia: Majalah Ilmiah dan Informasi Kegeografian 11, Nr. 2 (27.02.2015). http://dx.doi.org/10.21831/gm.v11i2.3452.

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Penelitian ini dilakukan pada sistem perguaan Gesing-Jlamprong-Sinden yangberada di kawasan Karst Gunungsewu, Kabupaten Gunungkidul dengan tujuan untuk: (1)mengetahui pola lorong dan kenampakan speleogen-speleothem dalam gua, (2)mengetahui faktor-faktor yang mengendalikan speleogenesis, (3) merekonstruksi prosesperkembangan gua. Penelitian ini menggunakan metode deskriptif. Data dikumpulkandengan cara observasi, studi pustaka, dan dokumentasi. Dalam observasi dilakukanpengamatan dan pengukuran variabel lorong gua. Analisis dilakukan secara deskriptifdengan memperhatikan aspek-aspek geomorfologi, didukung dengan penalaran sebabakibat. Hasil penelitian menunjukkan Gua Gesing-Jlamprong-Sinden memiliki lorongutama tunggal dengan tipe lorong rectangular, eliptical, cayon, initial canyon, dan jointpassage. Kenampakan dalam gua didominasi oleh speleogen. Karakteristik lorong dankenampakan dalam gua tidak terlepas dari pengaruh faktor pengontrol speleogenesis,antara lain struktur geologi, topografi, litologi, dan hidrologi. Perkembangan Gua GesingJlamprong-Sinden dapat dirangkum dalam tiga tahap sejak akhir pleistosen masingmasing ditandai oleh pengangkatan disertai pembentukan kekar batugamping,perkembangan lorong oleh aliran freatik, serta perkembangan teras gua dan runtuhanlangit-langit gua.Kata kunci: speleogenesis, gua karst, lorong gua, perkembangan gua
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Dissertationen zum Thema "Eliptická metoda"

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Balko, Marek. „Studium přenosu tepla turbulentním prouděním v studeném héliovém plynu v experimentu s Rayleigh-Bénardovou konvekcí na ÚPT AV v Brně“. Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2021. http://www.nusl.cz/ntk/nusl-444294.

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The diploma thesis deals with the study of Rayleigh-Bénard convection for Rayleigh numbers in the range 1E8-1E14. The evaluated data come from an experiment with cryogenic helium in a cylindrical cell in a configuration with cell diameter D = 30 cm, height L = 30 cm and a second configuration with cell diameter D = 30 cm, height L = 15 cm. Miniature sensors recorded temperature fluctuations over time under various physical conditions and properties of helium. Using MATLAB software, the output parameters of the system (Nusselt and Reynolds numbers) and their dependence on the control parameters (Rayleigh and Prandtl numbers) were determined from the measured data. A new approach to the distribution of measured signals according to the direction of large scale circulation was used in the work, which leads to improved analysis. Reynolds numbers were evaluated using the so-called elliptic method. Furthermore, the work deals with the study of the coherent structure of the large scale circulation inside the cell.
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Silveira, Dimas Leopoldo. „Um metodo de elementos finitos para equações eliticas de segunda ordem“. [s.n.], 1987. http://repositorio.unicamp.br/jspui/handle/REPOSIP/306062.

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Orientador: Maria Cristina Cunha Bezerra
Dissertação (mestrado) - Universidade Estadual de Campinas, Instituto de Matematica, Estatistica e Computação Científica
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Resumo: Não informado.
Abstract: Not informed.
Mestrado
Mestre em Matemática Aplicada
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Herbrych, Daniel. „Generování eliptických křivek pro kryptografický protokol“. Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2019. http://www.nusl.cz/ntk/nusl-401955.

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This thesis deals with creation of elliptic curves generator. MIRACL library and C++ language are used. One of important issues is to determine the order of the elliptic curve group. SEA algorithm (Schoof–Elkies–Atkin) is used for point counting on the elliptic curve. Method with this algorithm is called as counting points method, SEA method etc. Next method is CM method. Both methods are available in the generator. The measurements of dependency of basic operations speed on the group size and parameters were done. ECIES hybrid scheme was implemented. It is practical verification of proper functionality of the generator. Another benchmarks measured dependency of ECIES encryption and decryption on various parameters, e.g. size of the curve, generating method, message size etc.
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Valenta, Václav. „Moderní metody řešení eliptických parciálních diferenciálních rovnic“. Master's thesis, Vysoké učení technické v Brně. Fakulta informačních technologií, 2009. http://www.nusl.cz/ntk/nusl-236712.

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Partial differential equations solution and methods for transformation to a large sets of ordinary equations is described in this work. Taylor series method is important for this work. This method needs higher derivatives for correct work. Ways how to compute higher derivatives are also discused in this work.
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Lopes, Gabriela Cantarelli. „Desenvolvimento de modelo numerico tridimensional e eliptico para o estudo de escoamentos no interior de dutos cilindricos“. [s.n.], 2008. http://repositorio.unicamp.br/jspui/handle/REPOSIP/266262.

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Orientador: Jose Roberto Nunhez
Dissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Quimica
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Resumo: Processos que envolvem escoamentos de fluidos no interior de dutos estão presentes em muitas aplicações industriais. Na indústria petroquímica um desses processos que vem se tornando cada vez mais importante é o craqueamento catalítico de frações pesadas do petróleo, já que as converte em frações leves e mais nobres. Por causa da crescente demanda mundial por gasolina e GLP e à sua alta rentabilidade para uma refinaria de petróleo, unidades de craqueamento catalítico em leito fluidizado (FCC) estão presentes em todo o mundo. Testes experimentais costumam ser usados no estudo dos fenômenos envolvidos nesse processo. Porém esse tipo de análise possui alto custo, que pode ser reduzido com o uso de simulações computacionais em seu estudo inicial. Assim, o objetivo deste trabalho foi desenvolver um modelo tridimensional e elíptico, em linguagem Fortran, capaz de fornecer dados para a análise preliminar de escoamentos no interior de reatores de FCC. Na modelagem desses problemas são usadas equações diferenciais parciais, e essas não possuem solução analítica conhecida, sendo necessário o emprego de métodos numéricos para esse fim. Neste trabalho foi usado o Método dos Volumes Finitos, que tem a função de substituir as equações diferenciais parciais por equações algébricas aplicadas a pequenos volumes de controle finitos pertencentes ao domínio. Uma das maiores dificuldades encontradas no tratamento numérico de escoamentos incompressíveis é a determinação de um campo de pressão que satisfaça a Equação da Continuidade. Esse problema foi resolvido fazendo-se uso da abordagem acoplp.da de solução. Para análise do modelo foram obtidos perfis numéricos de velocidade e pressão para fluidos escoando em regimes laminar e turbulento, que foram validados usando-se os dados obtidos com a solução analítica das equações, por correlações (semi-) empíricas ou por dados experimentais, conforme cada um dos casos. Notou-se que o modelo representa muito bem casos laminares, e gue 11.oS casos turbulentos foi necessário um maior refino da malha próximo a parede do tubo. Também foram feitas simulações para que se pudessem observar as características tridimensionais, elípticas e transientes da modelagem do escoamento. De maneira geral o modelo se mostrou bastante rápido, convergindo em poucas iterações. Palavras-Chave: Fluidodinâmica computacional; dutos cilíndricos; modelo tridimensional e elíptico; método dos Volumes Finitos; solução acoplada; turbulência
Abstract: Processes involving fluid flow in tubes are present in many industrial applications. In petrochemical industry one of these processes that are becoming more and more important is the fluid catalytic cracking of heavy petroleum fractions. This fact is due to the process capacity to convert heavy fractions in light and valuable ones. Because of the increasingly worldwide demand for gasoline and LPG and its high yield for a petroleum refinery, fluid catalytic cracking (FCC) units are present in the whole world. Experimental tests are used in the study of the phenomena involved in this processo However this kind of analysis has high cost which can be reduced by using computational simulations in its initial study. Thus, the aim of this work was the development of a three-dimensional and elliptical mo dei in Fortran language in order to provide data for fluid flow preliminary analysis in FCC reactors. Partial differential equations were used in the modeling of these problems. These equations do not have known analytical solution, being necessary therefore the use of numerical methods. In this work the Finite Volume Method were applied with this purpose. This method has as a role to substitute the partial differential equations of the mo dei for algebric equations applied to small finite control volumes of the domain. One of the biggest difficulties found in the numerical treatment of incompressible fluid flows is the determination of apressure field that satisfies the Continuity Equation. This problem was solved using the coupled solution approach. For model analysis, numerical velocity and pressure proJ:iles for laminar and turbulent flows were obtained, that had been validated using the data obtained through the analytical solution of the equations, by empirical correlations or by experimental data, according to each one of the cases. The model represented well laminar cases, and in the turbulent ones the mesh had to be more refined near the tube wall. Other simulations were performed, in aQalyzing the three-dimensional, elliptical and transient model characteristics. In general, the mo dei was very fast, converging in a few interations. Keywords: Computational fluid dyn~mic; cylindrical ducts; three-dimensional and elliptical model; Finite Volume Method; coupled solution; turbulence
Mestrado
Desenvolvimento de Processos Químicos
Mestre em Engenharia Química
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Guimarães, Angelo. „Existência e multiplicidade de soluções de problemas elípticos com termo semilinear côncavo-convexo“. Universidade Federal de Goiás, 2017. http://repositorio.bc.ufg.br/tede/handle/tede/6901.

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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - CAPES
In this work we study existence and multiplicity of weak solutions for the eliptic problem with semilinear concave convex term, in a limited domain of a N-dimensional euclidean space. If we take f=0 and σ=1 we have a problem homogeneous with critical Sobolev exponent in which we use the Mountain Pass Theorem to find existence of a solution when pNeste trabalho estudaremos existência e multiplicidade de soluções fracas do problema elíptico com termo semilinear côncavo-convexo, em um domínio limitado de um espaço euclidiano de dimensão N. Ao tomarmos f=0 e σ=1 temos um problema homogêneo com expoente crítico de Sobolev em que utilizamos o Teorema do Passo da Montanha para encontrar existência de uma solução quando p
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Breitenbacher, Dominik. „Paralelizace faktorizace celých čísel z pohledu lámání RSA“. Master's thesis, Vysoké učení technické v Brně. Fakulta informačních technologií, 2015. http://www.nusl.cz/ntk/nusl-234905.

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This paper follows up the factorization of integers. Factorization is the most popular and used method for RSA cryptoanalysis. The SIQS was chosen as a factorization method that will be used in this paper. Although SIQS is the fastest method (up to 100 digits), it can't be effectively computed at polynomial time, so it's needed to look up for options, how to speed up the method as much as possible. One of the possible ways is paralelization. In this case OpenMP was used. Other possible way is optimalization. The goal of this paper is also to show, how easily is possible to use paralelizion and thanks to detailed analyzation the source codes one can reach relatively large speed up. Used method of iterative optimalization showed itself as a very effective tool. Using this method the implementation of SIQS achieved almost 100 multiplied speed up and at some parts of the code even more.
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Colnago, Marilaine. „Um método de interface imersa de alta ordem para a resolução de equações elípticas com coeficientes descontínuos“. Universidade de São Paulo, 2017. http://www.teses.usp.br/teses/disponiveis/55/55134/tde-24072018-104953/.

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Problemas de interface do tipo elípticos são frequentemente encontrados em dinâmicas de fluidos, ciências dos materiais, mecânica e outros campos de estudo. Em particular, o clássico Método de Interface Imersa (IIM) figura como uma das abordagens numéricas mais robustas para resolver problemas dessa categoria, o qual tem sido empregado recorrentemente para simular o comportamento de fluxos sobre corpos imersos em malhas cartesianas. Embora esse método seja eficiente e robusto, técnicas construídas com base no IIM impõem como restrições matemáticas diversos tipos de condições de salto na interface a fim de serem passíveis de utilização na prática. Nesta tese, introduzimos um novo método de Interface Imersa para resolver problemas elípticos com coeficientes descontínuos em malhas cartesianas. Diferentemente da maioria das formulações existentes que dependem de vários tipos de condições de salto para produzirem uma solução para o problema elíptico, o esquema aqui proposto reduz significativamente o número de restrições ao solucionar a EDP estudada, isto é, apenas os saltos de ordem zero das incógnitas devem ser fornecidos. A técnica apresentada combina esquemas de Diferenças Finitas, abordagem do Ponto Fantasma, modelos de correções e regras de interpolação em uma metodologia única e concisa. Além disso, o método proposto é capaz de produzir soluções de alta ordem, incluindo cenários onde há poucos dados disponíveis onde o quesito alta precisão é indispensável. A robustez e a precisão do método proposto são verificadas através de uma variedade de experimentos numéricos envolvendo diversos problemas elípticos com interfaces arbitrárias. Finalmente, a partir dos testes numéricos conduzidos, é possível concluir que o método projetado produz aproximações de alta ordem a partir de um número muito condensado de restrições matemáticas.
Elliptic interface problems are often encountered in fluid dynamics, material sciences, mechanics and other relevant fields of study. In particular, the well-known Immersed Interface Method (IIM) figures among the most effective approaches for solving non-trivial problems, where the method is traditionally used to simulate the flow behavior over complex bodies immersed in a cartesian mesh. Although their powerfulness and versatility, techniques that are built in light of the IIM impose as constraints different types of jump conditions at the interface in order to be properly managed and applicable for specific purposes. In this thesis, we introduce a novel Immersed Interface Method for solving Elliptic problems with discontinuous coefficients on cartesian grids. Different from most existing formulations that rely on various jump conditions types to get a valid solution, the present scheme reduces significatively the number of constraints when solving the PDE problem, i.e., only the ordinary jumps of the unknowns are required to be given, a priori. Our technique combines Finite Difference schemes, Ghost node strategy, correction models, and interpolation rules into a unified and concise methodology. Moreover, the method is capable of producing high-order solutions, succeeding in many practical scenarios with little available data wherein high precision is indispensable. We attest the robustness and the accuracy of the proposed method through a variety of numerical experiments involving several Elliptic problems with arbitrary interfaces. Finally, from the conducted numerical tests, we verify that the designed method produces high-order approximations from a very limited number of valid jump constraints.
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9

Ferraz, Paola Cunha 1988. „Implementação de um algoritmo multi-escala para sistemas de equações lineares de grande porte mal condicionados provenientes da discretização de problemas elípticos em dinâmica de fluidos em meios porosos“. [s.n.], 2015. http://repositorio.unicamp.br/jspui/handle/REPOSIP/307022.

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Orientador: Eduardo Cardoso de Abreu
Dissertação (mestrado) - Universidade Estadual de Campinas, Instituto de Matemática Estatística e Computação Científica
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Resumo: O foco deste trabalho é aproximação numérica de problemas envolvendo equações diferenciais parciais (EDPs), de natureza elíptica, no contexto de aplicações em dinâmica de fluidos em meios porosos. Especificamente, a dissertação pretende contribuir com uma implementação de um algoritmo multiescala e multigrid, recentemente introduzido na literatura, para resolução aproximada de sistemas de equações lineares de grande porte e mal condicionados, proveniente dessa classe de EDPs, tipicamente associada a problemas de Poisson de pressão-velocidade com condições de contornos típicas de fluxo em meios porosos. O problema concreto de Poisson discutido neste trabalho será desacoplado do sistema de transporte de EDPs de convecção-difusão, com convecção dominante, e linearizado por meio do emprego de uma técnica de decomposição de operadores. A metodologia para a discretização do problema elíptico de Poisson é elementos finitos mistos híbridos. A resolução numérica do sistema linear resultante deste procedimento será realizado via um método do tipo Gradientes Conjugados com Pré-condicionamento (PCG) multiescala e multigrid. Combinamos as metodologias multi-escala e multigrid de modo a capturar os distintos comprimentos de onda associados aos diferentes comprimentos de onda do operador diferencial auto-adjunto de Poisson, fortemente influenciado pela heterogeneidade das propriedades geológicas do meio poroso, em particular da permeabilidade absoluta, que pode exibir flutuações em várias ordens de grandeza. Experimentos computacionais em aplicações de problemas de dinâmica de fluidos em meios porosos são apresentados e discutidos para verificação dos resultados obtidos
Abstract: The focus of this work is the numerical approximation of differential problems involving partial differential equations (PDE's) of elliptic nature, in the context of modelling and simulation in fluid dynamics in porous media. The dissertation aims to contribute with an implementation of a multiscale multigrid algorithm, recently introduced in the literature, designed for solving ill-conditioned large linear systems of equations derived from those classes of PDE's, typically associated with Poisson problems of pressure-velocity with boundary conditions typical of flow in porous media. The Poisson problem discussed here is identified from the coupled convection-diffusion transport system counterpart of PDE's, with dominated convection, and by a linearization by means the use of an operator splitting approach. The methodology used for the discretization of the Poisson elliptic problem is by mixed hybrid finite elements. The numerical solution of the resulting linear system will be addressed by a multiscale multigrid preconditioned conjugate gradient (PCG) method. We combine both methodologies in order to capture the distinct wavelengths associated with the different wavelengths from the assosiated self-adjoint Poisson operator, strongly influenced by the heterogeneity of the geological properties of the porous media, in particular to the absolute permeability tensor, which in turn might exhibit very large fluctuations of orders of magnitude. Numerical experiments in applications of fluid dynamics problems in porous media are presented and discussed for a verification of the results obtained by direct numerical simulations with the multiscale multigrid algorithm under consideration
Mestrado
Matematica Aplicada
Mestra em Matemática Aplicada
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Gonçalves, João Luis 1982. „Indicadores de erros a posteriori na aproximação de funcionais de soluções de problemas elípticos no contexto do método Galerkin descontínuo hp-adaptivo“. [s.n.], 2011. http://repositorio.unicamp.br/jspui/handle/REPOSIP/306590.

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Orientador: Sônia Maria Gomes, Philippe Remy Bernard Devloo, Igor Mozolevski
Tese (doutorado) - Universidade Estadual de Campinas, Instituto de Matemática, Estatística e Computação Científica
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Resumo: Neste trabalho, estudamos indicadores a posteriori para o erro na aproximação de funcionais das soluções das equações biharmônica e de Poisson obtidas pelo método de Galerkin descontínuo. A metodologia usada na obtenção dos indicadores é baseada no problema dual associado ao funcional, que é conhecida por gerar os indicadores mais eficazes. Os dois principais indicadores de erro com base no problema dual já obtidos, apresentados para problemas de segunda ordem, são estendidos neste trabalho para problemas de quarta ordem. Também propomos um terceiro indicador para problemas de segunda e quarta ordem. Estudamos as características dos diferentes indicadores na localização dos elementos com as maiores contribuições do erro, na caracterização da regularidade das soluções, bem como suas consequências na eficiência dos indicadores. Estabelecemos uma estratégia hp-adaptativa específica para os indicadores de erro em funcionais. Os experimentos numéricos realizados mostram que a estratégia hp-adaptativa funciona adequadamente e que o uso de espaços de aproximação hp-adaptados resulta ser eficiente para a redução do erro em funcionais com menor úmero de graus de liberdade. Além disso, nos exemplos estudados, a qualidade dos resultados varia entre os indicadores, dependendo do tipo de singularidade e da equação tratada, mostrando a importância de dispormos de uma maior diversidade de indicadores
Abstract: In this work we study goal-oriented a posteriori error indicators for approximations by the discontinuous Galerkin method for the biharmonic and Poisson equations. The methodology used for the indicators is based on the dual problem associated with the functional, which is known to generate the most effective indicators. The two main error indicators based on the dual problem, obtained for second order problems, are extended to fourth order problems. We also propose a third indicator for second and fourth order problems. The characteristics of the different indicators are studied for the localization of the elements with the greatest contributions of the error, and for the characterization of the regularity of the solutions, as well as their consequences on indicators efficiency. We propose an hp-adaptive strategy specific for goal-oriented error indicators. The performed numerical experiments show that the hp-adaptive strategy works properly, and that the use of hp-adapted approximation spaces turns out to be efficient to reduce the error with a lower number of degrees of freedom. Moreover, in the examples studied, a comparison of the quality of results for the different indicators shows that it may depend on the type of singularity and of the equation treated, showing the importance of having a wider range of indicators
Doutorado
Matematica Aplicada
Doutor em Matemática Aplicada
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Bücher zum Thema "Eliptická metoda"

1

Li, Zi-Cai. Global Superconvergence of Finite Elements for Eliptic Equations and Its Applications: Tuo yuan fang cheng you xian fang fa de zheng ti chao shou lian ji qi ying yong. Beijing: SCIENCE PRESS, 2012.

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Bjorstad, Petter, Barry Smith und William Gropp. Domain Decomposition: Parallel Multilevel Methods for Elliptic Partial Differential Equations. Cambridge University Press, 2004.

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