403 research outputs found
Optimisation de forme pour la résistance de vague d'un corps immergé
No full textIn this thesis, we compute the shape of a fully immersed object with a given area which minimises the wave resistance. The smooth body moves at a constant speed under the free surface of a fluid which is assumed to be inviscid and incompressible. The wave resistance is the drag, i.e. the horizontal component of the force exerted by the fluid on the obstacle. We work with the 2D Neumann-Kelvin equations, which are obtained by linearising the irrotational Euler equations with a free surface. The Neumann-Kelvin problem is formulated as a boundary integral equation based on a fundamental solution which handles the linearised free surface condition. We use a gradient descent method to find a local minimiser of the wave resistance problem. A gradient with respect to the shape is calculated by a boundary variation method. We use a level-set approach to calculate the wave-making resistance and to deal with the displacements of the boundary of the obstacle. We obtain a great variety of optimal shapes depending on the depth of the object and its velocity.Dans cette thèse, nous calculons la forme d’un objet immergé d’aire donnée qui minimise la résistance de vague. Le corps, considéré lisse, avance à vitesse constante sous la surface libre d’un fluide qui est supposé parfait et incompressible. La résistance de vague est la traînée, c’est-à-dire la composante horizontale de la force exercée par le fluide sur l’obstacle. Nous utilisons les équations de Neumann-Kelvin 2D, qui s’obtiennent en linéarisant les équations d’Euler irrotationnelles avec surface libre. Le problème de Neumann-Kelvin est formulé comme une équation intégrale de frontière basée sur une solution fondamentale qui intègre la condition linéarisée à la surface libre. Nous utilisons une méthode de descente de gradient pour trouver un minimiseur local du problème de résistance de vague. Un gradient par rapport à la forme est calculé par la méthode de variation de frontières. Nous utilisons une approche level-set pour calculer la résistance de vague et gérer les déplacements de la frontière de l’obstacle. Nous obtenons une grande variété de formes optimales selon la profondeur de l’objet et sa vitesse
Optimisation de forme pour la résistance de vague d'un corps immergé
No full textIn this thesis, we compute the shape of a fully immersed object with a given area which minimises the wave resistance. The smooth body moves at a constant speed under the free surface of a fluid which is assumed to be inviscid and incompressible. The wave resistance is the drag, i.e. the horizontal component of the force exerted by the fluid on the obstacle. We work with the 2D Neumann-Kelvin equations, which are obtained by linearising the irrotational Euler equations with a free surface. The Neumann-Kelvin problem is formulated as a boundary integral equation based on a fundamental solution which handles the linearised free surface condition. We use a gradient descent method to find a local minimiser of the wave resistance problem. A gradient with respect to the shape is calculated by a boundary variation method. We use a level-set approach to calculate the wave-making resistance and to deal with the displacements of the boundary of the obstacle. We obtain a great variety of optimal shapes depending on the depth of the object and its velocity.Dans cette thèse, nous calculons la forme d’un objet immergé d’aire donnée qui minimise la résistance de vague. Le corps, considéré lisse, avance à vitesse constante sous la surface libre d’un fluide qui est supposé parfait et incompressible. La résistance de vague est la traînée, c’est-à-dire la composante horizontale de la force exercée par le fluide sur l’obstacle. Nous utilisons les équations de Neumann-Kelvin 2D, qui s’obtiennent en linéarisant les équations d’Euler irrotationnelles avec surface libre. Le problème de Neumann-Kelvin est formulé comme une équation intégrale de frontière basée sur une solution fondamentale qui intègre la condition linéarisée à la surface libre. Nous utilisons une méthode de descente de gradient pour trouver un minimiseur local du problème de résistance de vague. Un gradient par rapport à la forme est calculé par la méthode de variation de frontières. Nous utilisons une approche level-set pour calculer la résistance de vague et gérer les déplacements de la frontière de l’obstacle. Nous obtenons une grande variété de formes optimales selon la profondeur de l’objet et sa vitesse
PENGKLASTERAN PASIEN KANKER LEUKEMIA BERDASARKAN DATA EKSPRESI GEN DENGAN MENGGUNAKAN DEKOMPOSISI NILAI SINGULAR
Get PDFInformasi yang terkandung di dalam rangkaian molekular Deo-xyribonucleic acid (DNA) makhluk hidup dapat diketahui melaluiteknologi microarray. Data microarray menyajikan data tingkatekspresi gen yang umumnya berukuran besar. Satu sampel pada data microarray bisa memiliki ribuan atau puluhan ribu gen. Pada penelitian ini diolah data pasien kanker darah (leukemia) yang berukuran 500032dengan entri tak negatif. Data microarray pasien leukemia dapat diolah dengan menggunakan Dekomposisi Nilai Singular sedemikian sehingga sampel yang memiliki sifat yang sama dikelompokkan dalam satu kelompok. Dekomposisi Nilai Singular digunakan untuk mengelompokkan data dengan dua macam keragaman (bi-clustering), yaitu menggunakan nilai vektor singular kedua dan ketiga. Dari implementasi pada data, pasien kanker dapatdikelompokkan menjadi penyakit AML, dan ALL beserta sub tipepenyakit ALL, yakni ALL-T dan ALL-B
Retta language revitalization learning materials in Alor Regency
Get PDFCurrently there are various learning materials that are able to motivate younger generations in learning local and indigenous languages. One example is the creation of songs in Retta language revitalization program in Alor Regency. In this regard, this study seeks to explain the process of revitalizing the Retta language and reviewing the effectiveness of revitalizing the Retta language through local language songs as learning materials. This is important because language and culture transmission through songs is a novelty in a language revitalization program. The research method uses a community—based language revitalization model and a descriptive qualitative approach with observational method from the analysis of Retta language songs in the language revitalization program. As a result, the Retta language revitalization in the South Ternate Village using local language songs is effective in increasing the interest of young speakers in the local language. This is based on the impact felt by the language revitalization participants as young speakers and Retta speakers in general. Besides that, the Retta language revitalization program was also able to raise public and local government awareness with evidence of the signing of a memorandum of understanding to preserve the Retta language in the future. Thus, the Retta language revitalization program using local language songs can continue to be developed by the local government.Bahan pembelajaran revitalisasi bahasa Retta di Kabupaten AlorAda banyak bahan pembelajaran yang dapat menjadi pendukung untuk meningkatkan motivasi penutur muda dalam belajar bahasa daerah. Salah satu contohnya adalah pembuatan lagu berbahasa daerah dalam program revitalisasi bahasa Retta di Kabupaten Alor. Sehubungan dengan hal tersebut, penelitian ini berusaha menjelaskan proses revitalisasi bahasa Retta dan meninjau keefektifan bentuk revitalisasi bahasa melalui lagu berbahasa daerah sebagai bahan pembelajaran. Hal ini disebabkan transmisi bahasa dan budaya melalui lagu termasuk hal baru dalam program revitalisasi bahasa. Metode penelitian menggunakan model revitalisasi bahasa berbasis komunitas dan pendekatan kualitatif deskriptif dengan metode observasi dari analisis lagu berbahasa Retta dalam program revitalisasi bahasa. Hasilnya, revitalisasi bahasa Retta di Desa Ternate Selatan dengan menggunakan lagu berbahasa daerah efektif meningkatkan minat generasi muda terhadap bahasa daerah. Hal ini berdasarkan dampak yang dirasakan oleh peserta revitalisasi bahasa sebagai penutur muda dan penutur bahasa Retta secara umum. Selain itu, program revitalisasi bahasa Retta juga mampu meningkatkan kesadaran masyarakat dan pemerintah daerah dengan bukti penandatanganan nota kesepahaman untuk melestarikan bahasa Retta di masa depan sehingga program dapat terus dikembangkan oleh pemerintah daerah setempat
A Narrative Approach to Authorship: The Work of Evi Tampold from Her Mother/Publisher’s (and Her Own) Perspective
No full textCollaborative authorship in graphic medicine is examinable from a number of perspectives. One neglected approach is to look for developments in how an individual artist collaborates over the course of illustrating different graphic medicine novels. In the first, the artist collaborated with her younger self in trying to regain memories of an until then forgotten past. In the second, she worked closely with the writer to try to determine exactly what the author intended, adding a new dimension to the piece unavailable without the illustrations. In the third still to be completed work, her illustrations are based on collaboration with only the text and a few photographs, lacking direct contact with the author. How this artist’s three methods of collaboration have defined her collaborative authorship will be the focus. What is unique is this study will be undertaken from the stand point of the illustrator’s publisher, who is also her mother. </jats:p
PERKALIAN MATRIKS PERSEGI MENGGUNAKAN ALGORITMA STRASSE
Get PDFPerkalian matriks merupakan salah satu operasi dasar dalam aljabar linear dan sering digunakan dalam komputasi ilmiah.Kasus komputasi ilmiah yang melibatkan perkalian matriks umumnya menggunakan matriks berordo besar.Algoritma Strassen merupakan salah satu algoritma yang dapat menjadi alternatif digunakan pada perkalian matriks yang berordo besar. Algoritma Strassen melakukan perkalian matriks persegi menggunakan 18 bentuk penjumlahan skalar dan 7 bentuk perkalian skalar sebagai dasar perhitungannya, yang diteruskan secara rekursif hingga diperoleh hasil perkalian. Algoritma ini memiliki kompleksitas waktu O(n2,81) untuk mengalikan matriks ordo n×n. Saat awal perkembangannya, algoritma ini hanya dapat digunakan untuk matriks ordo syarat yaitu, bilangan pangkat dari 2. Namun algoritma ini terus dikembangkan sehingga telah dapat digunakan untuk semua matriks persegi ordo sebarang dengan menambahkan baris dan kolom nol hingga memenuhi ordo syarat. Hasil yang diperoleh dari perhitungan flops (jumlah operasi aritmatika dasar yang diperlukan algoritma) menunjukkan bahwa, algoritma Strassen lebih optimal apabila digunakan pada matriks dengan ordo yaitu bilangan pangkat dari 2, yaitu tepatnya mulai dari ordo 1024×1024. Namun untuk perkalian matriks ordo bilangan pangkat dari 2 dibawah 1024×1024, penggunaan algoritma Strassen tidak menunjukkan keoptimalannya. Oleh karena itu algoritma Strassen dapat disarankan sebagai suatu alternatif pada proses komputasi ilmiah yang melibatkan perkalian matriks persegi dengan ordo besar mulai dari 1024×1024 dimana ordo matriks merupakan bilangan pangkat dari 2. Kata Kunci :Perkalian Matriks, Kompleksitas Waktu, Algoritma Strassen.PERKALIAN MATRIKS PERSEGI MENGGUNAKAN ALGORITMA STRASS
PENYELESAIAN PERSAMAAN GELOMBANG DENGAN METODE DALEMBERT
Get PDFPermasalahan di bidang teknik dan fisika dapat dimodelkan ke dalam bentuk persamaan diferensial parsial, seperti masalah fluida, transfer panas, teori elektromagnetik, dan perambatan gelombang. Penelitian ini mengkaji terbentuknya persamaan gelombang dan mencari penyelesaian persamaan gelombang dengan metode Dalembert. Penyelesaian persamaan gelombang dengan metode Dalembert dilakukan dengan cara mengenalkan variabel bebas baru, kemudian variabel bebas tersebut diturunkan sehingga terbentuk penyelesaian persamaan gelombang. Dengan mensubstitusikan nilai awal diperoleh persamaan khusus dari persamaan gelombang yang disebut sebagai penyelesaian Dalembert . Kata Kunci : Metode Dalembert, Persamaan Diferensial Parsial, Persamaan Gelombang
My Audio Installation Artwork Air Free /Air Free 2 as a practice research output. Here you can listen to the Audio of the installation and read the words that the visitors could read while listening.
Get PDFAir Free/Air Free 2 – Audio Installation Exhibited in: THE NEW NEW, 83rd Thessaloniki International Fair’s Pavilion 2 - Thessaloniki, Greece. 8-16 September 2018 FREIRAUM in Berlin, On the State of Freedom in Europe: Exhibition, discussion, concert, performance in Berlin. ZK/U Center for Art and UrbanisticsSiemensstraße 27, 10551 Berlin. 12-17 March 2019. Freiraum Exhibition: From Berlin to Thessaloniki. LABattoir -Thessaloniki, Greece. 17-24 May 2019. Created for a collaboration with the Goethe Institut, ArtBOX&Artecitya in the Freiraum project. Co-Funded by the Creative Europe Programme of the European Union. As an academic researcher and audio practitioner, one of my main interests is understanding the intimate qualities of mediated sound. The radio voice, this fragment of an otherwise unknown person, contains some of their most intimate qualities. In this project a space is created that simulates the unseen intimacies of the airwaves. Voices meet and converse privately yet freely, through the intimacy of the voice as pure sound. The voices in this artwork were collected in Thessaloniki-Greece and Carlisle- UK. The anonymous Greek-speaking voices were collected for me in Thessaloniki by Maria Kyrou, Stella Massia & Eleni Papoulidou from the community group Media Lab by LABattoir, after workshops where I taught audio documentary, theory and practice. The aim was for local people to bring me the voices of their community, rather than me selecting these as an outsider who might carry preconceptions. The English-speaking voices belong to poets from the Speak Easy poetry group in Carlisle: Jane Moss-Luffrum, Phil Hewitson, Susan Cartwright Smith, James Scott Riddick, John Chambers, Ruby Evans, Kim Braschko(& her 2 children Maya and Henry). The poets were sent audio clips of the voices from Greece along with three short poems I wrote in English, deriving from the content of the stories collected in Thessaloniki. The poets were asked to write poems as responses to these voices and my poem. Despite only listening to voices they could not understand and my poems being a very abstract representation of those voices, the poets in Carlisle absolutely captured the essence of those stories and provided very emotive responses. I edited these voices together in a conversation that reveals how the intricacies, fears, aspirations of distant communities might be much closer than they seem. The voices in this artwork are an intimate aural tapestry of all those things that we have in common. The work was listened to via headphones, within an intimate, private audio booth. Poems written by Evi K based on the interviews and stories collected in Greece: 1. I am a grandmother Eighty-one years old when I was eleven, There was guerrilla fighting then. My mother sent me back to the village To get a police permit Night fell, I was taken In by a friend. The fighters took my friend. They did not take me cause I was thin, a fake. I made it back to Neapoli. I went to school, they gave us cocoa and raisin bread. Then they took us to the islands, in Mytilene For eight months My dad, they were sad They filled in the paperwork and they took us back I finished primary school. My story is this one story. I have many but I cannot tell any more. 2. I am twenty years old. I come from Albania. People there do not warm up to me. I cannot quite speak like them. I came to Thessaloniki when I was ten months old. Life here is better than it is there. For me. Here I can open up to people. Cause this is the language I speak. 3. I am fifty-three years old. I am a musician. Today With millions of people around Here, now, I am sitting in my bedroom. Twenty meters away lives my best friend Five meters away, my cousin. I do not want to get in touch. It is so sweet to be alone. I am replete. I want good friends. I want a wife. I have a child. I am not really lonely. This is why I want to be alon
BILANGAN DOMINASI EDGE-VERTEX DAN VERTEX-EDGE PADA GRAF LINTASAN, CYCLE, CENTIPEDE DAN MASING-MASING MIDDLE GRAPHNYA
Get PDFSebuah himpunan , adalah himpunan dominasi pada graf jika semua simpul yang tidak berada pada himpunan bertetangga sedikitnya dengan satu simpul dari dan kardinalitas minimum dari disebut bilangan dominasi . Ada banyak jenis bilangan dominasi yang telah dikembangkan diantaranya bilangan dominasi edge-vertex dan bilangan dominasi vertex-edge. Sebuah himpunan adalah himpunan dominasi edge-vertex jika untuk semua simpul pada ada sisi sedemikian sehingga mendominasi dan kardinalitas minimum dari disebut bilangan dominasi edge-vertex . Sebuah himpunan adalah himpunan dominasi vertex-edge jika untuk semua sisi pada ada simpul sedemikian sehingga mendominasi dan kardinalitas minimum dari disebut bilangan dominasi vertex-edge . Hasil dari penelitian diperoleh bilangan dominasi edge-vertex pada graf lintasan, cycle dan centipede serta pada middle graph dari graf tersebut yaitu , , , , dan . Bilangan dominasi vertex-edge pada graf lintasan, cycle dan centipede serta pada middle graph dari graf tersebut yaitu , , , , dan . Kata Kunci: bilangan dominasi, edge-vertex, vertex-edge, graf lintasan, cycle, centiped
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