# Seminários Lista

20 de fevereiro de 2019, 20:49h
• Seminar on Computer Graphics

20 de fevereiro de 2019, 13:30h  13:3015:00
Auditorium 3, IMPA-2-Auditorium 3 (100) [Live Recording & Streaming, Microphone, Projector]

Title: VR Kino+Theater

Speaker: Luiz Velho – IMPA

Abstract: The VR Kino+Theater platform integrates traditional forms of entertainment (theater and cinema), with advanced interactive media, (virtual reality and gaming). In this way, it solves the scalability of audience and presentation familiarity, while providing greater flexibility for innovative alternative formats.

The operation of such ecosystem entails new roles for producers, performers and participants.

• Seminar on Computer Graphics

20 de fevereiro de 2019, 13:30h  13:3015:00
Auditorium 3

Title: The many faces of stiffness

Speaker: Uri Ascher – Department of Computer Science, University of BC

Abstract: The words "stiff'', "stiffness'', "stiffening", etc., arise often in applications when simulating, calibrating and controlling dynamics. But these words often have different meanings in different contexts.A subset on which we will concentrate includes:- Textbook-type (decaying) numerical ODE stiffness- Highly oscillatory stiffness- Stiffness matrix- Numerical stiffening

Some of these terms are popular in scientific computing, while others come from mechanical engineering. A potential confusion may arise in this way, and it gets serious when more than one meaning is encountered in the context of one application. Such is the case with the simulation of deformable objects in visual computing, where all of the above appear in one way or another under one roof.

In this lecture I will describe the meaning of stiffness in each of these topics, how they arise, how they are related, what practical challenges they bring up, and how these challenges are handled in context. The concepts and their evolution will be demonstrated.

It is about meshes — their resolution and spectral properties — both in time and in space.

• Seminar on Probability and Combinatorics

20 de fevereiro de 2019, 15:30h  15:3017:00
Room 349, IMPA-3-Classroom 349 (40)

Title: The K\”onig Graph Process

Speaker: Natasha Morrison – Cambridge and IMPA

Abstract: Say that a graph $G$ has property $\\mathcal{K}$ if the size of itsmaximum matching is equal to the order of a minimal vertex cover. Westudy the following process. Set $N:= \\binom{n}{2}$ and let $e_1, e_2,\\dots e_{N}$ be a uniformly random ordering of the edges of $K_n$, with$n$ an even integer. Let $\\Gour{0}$ be the empty graph on $n$ vertices.For $m \\geq 0$, $\\Gour{m+1}$ is obtained from $\\Gour{m}$ by adding theedge $e_{m+1}$ exactly if $\\Gour{m} \\cup \\{ e_{m+1}\\}$ has property$\\mathcal{K}$. We analyse the behaviour of this process, focusing mainlyon two questions: What can be said about the structure of $\\Gour{N}$ andfor which $m$ will $\\Gour{m}$ contain a perfect matching? This is jointwork with Nina Kamcev, Michael Krivelevich and Benny Sudakov.

• Seminar on Algebra

20 de fevereiro de 2019, 15:30h  15:3017:00
Room 228, IMPA-2-Classroom 228 (50) [Projector]

Title: A Survey on simple derivations and their isotropy group

Speaker: Daniel Levcovitz – ICMC-USP

Abstract: We will present a survey on recent results on simple derivations of polynomial rings and their isotropy groups.

22 de fevereiro de 2019, 20:49h
• Seminar on Computer Graphics

22 de fevereiro de 2019, 13:30h  13:3015:00
Auditorium 3, IMPA-2-Auditorium 3 (100) [Live Recording & Streaming, Microphone, Projector]

Title: Code-Assisted Music Composition with Python and Logic Pro X

Speaker: Marcelo Cicconet – Harvard University

Abstract: In this talk I will present experiments on how to integrate the power and flexibility of a general purpose programming language (Python, running on Jupyter) with the stability and extensive sound and effects library of a modern digital audio workstation (Logic Pro X) to compose an electronic dance music track. I will introduce and use simple music theory concepts to generate chord progression, bass line, arpeggios and other musical elements, which will be recorded in Logic via MIDI, using Logic's MIDI Clock messages for synchronization. The main advantage of using Python is the fact that it is popular and general-purpose — there's no need to learn a specific music-related programming language. The main advantage of sending algorithmically-generated music to Logic is that this environment holds a comprehensive library of sounds and effects that allow fully producing a music piece into a professional-sounding track. I will present one such track, composed specially for this talk using some of the algorithms to be discussed.

27 de fevereiro de 2019, 20:49h
• Seminar on Computer Graphics

27 de fevereiro de 2019, 13:30h  13:3015:00
Auditorium 3, IMPA-2-Auditorium 3 (100) [Live Recording & Streaming, Microphone, Projector]

Title: VR Tour

Speaker: Luiz Velho – IMPA

Abstract: VR Tour is a technological platform for the exploration of content in virtual reality. We present the core concepts of our platform followed by the conceptual and technical infrastructure which enables it. Then, we detail the elements involved in VR Tour

• Seminar on Computer Graphics

27 de fevereiro de 2019, 13:30h  13:3015:00
Auditorium 3

Title: VR Kino+Theater : The Tempest

Speaker: Luiz Velho – IMPA

Abstract: We present VR Kino+Theater, a platform that integrates traditional forms of entertainment (theater and cinema), with advanced interactive media, (virtual reality and gaming).

The foundations of our plataform lies onto three pillars related to technology, production, and delivery aspects which are the directions for the future media. The operation of such ecosystem entails new roles for producers, performers and participants.

We also show "The Tempest", an experiment based on the Shakespeare’s play that was produced as a proof-of-concept of the VR Kino+Theater platform.

• Seminar on Probability and Combinatorics

27 de fevereiro de 2019, 15:30h  15:3017:00
Room 349, IMPA-3-Classroom 349 (40)

Title: Probability in Number theory : Erdös Covering Systems

Speaker: Julian Sahasrabudhe – Cambridge and IMPA

Abstract: If $A_1,\\ldots,A_n$ are arithmetic progressions $A_i = d_i\\Z + a_i$, we say that $A_1,\\ldots,A_n$form a \\emph{covering system} if $\\bigcup_i^n A_i = \\mathbb Z$. Since their introduction in 1950 by Erdös, the subjectof covering systems has given rise to several attractive results and conjectures.For example, Hough proved (and thereby resolving a long-standing conjecture of Erdös) that one cannot coverthe integers with arithmetic progressions $A_1,\\ldots,A_n$ with \\emph{distinct} differences $d_1< \\cdots <d_n$ if the smallest difference is $> 10^{16}$.In this talk, I will discuss the resolution of some further conjectures on covering systems.This is joint work with Paul Balister, Béla Bollobás, Rob Morris and Marius Tiba.

• Seminar on Computer Graphics

27 de fevereiro de 2019, 18:00h  18:0019:30
Auditorium 3, IMPA-2-Auditorium 3 (100) [Live Recording & Streaming, Microphone, Projector]

Title: VR Tour : After The Tempest

Speaker: Luiz Velho – IMPA

Abstract: VR Tour is a technological platform for the exploration of content in virtual reality. We present the core concepts of our platform followed by the conceptual and technical infrastructure which enables it.

We also show "After The Tempest", a live performance of a new media experiment demonstrating our latest research in this area.

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