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13:43 Joe Leys, Étienne Ghys, Aurélien Alvarez English 2008

Dimensions | Chapter 6

  • Published: 2008
  • Publisher: Joe Leys, Étienne Ghys, Aurélien Alvarez
  • Language: English
13:52 Joe Leys, Étienne Ghys, Aurélien Alvarez German 2008

Dimensions | Kapitel 4

  • Published: 2008
  • Publisher: Joe Leys, Étienne Ghys, Aurélien Alvarez
  • Language: German
13:52 Joe Leys, Étienne Ghys, Aurélien Alvarez German 2008

Dimensions | Kapitel 2

  • Published: 2008
  • Publisher: Joe Leys, Étienne Ghys, Aurélien Alvarez
  • Language: German
14:05 Joe Leys, Étienne Ghys, Aurélien Alvarez German 2008

Dimensions | Kapitel 1

  • Published: 2008
  • Publisher: Joe Leys, Étienne Ghys, Aurélien Alvarez
  • Language: German
13:58 Joe Leys, Étienne Ghys, Aurélien Alvarez German 2008

Dimensions | Kapitel 8

  • Published: 2008
  • Publisher: Joe Leys, Étienne Ghys, Aurélien Alvarez
  • Language: German
13:18 Joe Leys, Étienne Ghys, Aurélien Alvarez English 2012

Chaos | Chapter 3 : Mechanics - The apple and the Moon

  • Published: 2012
  • Publisher: Joe Leys, Étienne Ghys, Aurélien Alvarez
  • Language: English
13:24 Joe Leys, Étienne Ghys, Aurélien Alvarez English 2012

Chaos | Chapter 2 : Vector fields - The lego race

  • Published: 2012
  • Publisher: Joe Leys, Étienne Ghys, Aurélien Alvarez
  • Language: English
13:21 Joe Leys, Étienne Ghys, Aurélien Alvarez English 2012

Chaos | Chapter 7 : Strange Attractors - The butterfly effect

  • Published: 2012
  • Publisher: Joe Leys, Étienne Ghys, Aurélien Alvarez
  • Language: English
13:20 Joe Leys, Étienne Ghys, Aurélien Alvarez English 2012

Chaos | Chapter 1 : Motion and determinism - Panta Rhei

  • Published: 2012
  • Publisher: Joe Leys, Étienne Ghys, Aurélien Alvarez
  • Language: English
13:21 Joe Leys, Étienne Ghys, Aurélien Alvarez English 2012

Chaos | Chapter 4 : Oscillations - The swing

  • Published: 2012
  • Publisher: Joe Leys, Étienne Ghys, Aurélien Alvarez
  • Language: English
13:20 Joe Leys, Étienne Ghys, Aurélien Alvarez English 2012

Chaos | Chapter 8 : Statistics - Lorenz' mill

  • Published: 2012
  • Publisher: Joe Leys, Étienne Ghys, Aurélien Alvarez
  • Language: English
13:30 Joe Leys, Étienne Ghys, Aurélien Alvarez English 2012

Chaos | Chapter 9 : Chaotic or not - Research today

  • Published: 2012
  • Publisher: Joe Leys, Étienne Ghys, Aurélien Alvarez
  • Language: English
13:19 Joe Leys, Étienne Ghys, Aurélien Alvarez English 2012

Chaos | Chapter 6 : Chaos and the horseshoe - Smale in Copacabana

  • Published: 2012
  • Publisher: Joe Leys, Étienne Ghys, Aurélien Alvarez
  • Language: English
13:15 Joe Leys, Étienne Ghys, Aurélien Alvarez English 2012

Chaos | Chapter 5 : Billiards - Duhem's bull

  • Published: 2012
  • Publisher: Joe Leys, Étienne Ghys, Aurélien Alvarez
  • Language: English
13:51 Joe Leys, Étienne Ghys, Aurélien Alvarez English 2008

Dimensions | Chapter 7

  • Published: 2008
  • Publisher: Joe Leys, Étienne Ghys, Aurélien Alvarez
  • Language: English
13:58 Joe Leys, Étienne Ghys, Aurélien Alvarez English 2008

Dimensions | Chapter 8

  • Published: 2008
  • Publisher: Joe Leys, Étienne Ghys, Aurélien Alvarez
  • Language: English
13:57 Joe Leys, Étienne Ghys, Aurélien Alvarez English 2008

Dimensions | Chapter 9

  • Published: 2008
  • Publisher: Joe Leys, Étienne Ghys, Aurélien Alvarez
  • Language: English
14:16 Joe Leys, Étienne Ghys, Aurélien Alvarez English 2008

Dimensions | Chapter 3

  • Published: 2008
  • Publisher: Joe Leys, Étienne Ghys, Aurélien Alvarez
  • Language: English
13:51 Joe Leys, Étienne Ghys, Aurélien Alvarez German 2008

Dimensions | Kapitel 5

  • Published: 2008
  • Publisher: Joe Leys, Étienne Ghys, Aurélien Alvarez
  • Language: German
13:52 Joe Leys, Étienne Ghys, Aurélien Alvarez English 2008

Dimensions | Chapter 4

  • Published: 2008
  • Publisher: Joe Leys, Étienne Ghys, Aurélien Alvarez
  • Language: English
13:43 Joe Leys, Étienne Ghys, Aurélien Alvarez German 2008

Dimensions | Kapitel 6

  • Published: 2008
  • Publisher: Joe Leys, Étienne Ghys, Aurélien Alvarez
  • Language: German
13:51 Joe Leys, Étienne Ghys, Aurélien Alvarez German 2008

Dimensions | Kapitel 7

  • Published: 2008
  • Publisher: Joe Leys, Étienne Ghys, Aurélien Alvarez
  • Language: German
14:16 Joe Leys, Étienne Ghys, Aurélien Alvarez German 2008

Dimensions | Kapitel 3

  • Published: 2008
  • Publisher: Joe Leys, Étienne Ghys, Aurélien Alvarez
  • Language: German
13:51 Joe Leys, Étienne Ghys, Aurélien Alvarez English 2008

Dimensions | Chapter 5

  • Published: 2008
  • Publisher: Joe Leys, Étienne Ghys, Aurélien Alvarez
  • Language: English
13:52 Joe Leys, Étienne Ghys, Aurélien Alvarez English 2008

Dimensions | Chapter 2

  • Published: 2008
  • Publisher: Joe Leys, Étienne Ghys, Aurélien Alvarez
  • Language: English
13:57 Joe Leys, Étienne Ghys, Aurélien Alvarez German 2008

Dimensions | Kapitel 9

  • Published: 2008
  • Publisher: Joe Leys, Étienne Ghys, Aurélien Alvarez
  • Language: German
47:24 EuroPython English 2014

DevOps Risk Mitigation

Schlomo Schapiro - DevOps Risk Mitigation: Test Driven Infrastructure The (perceived) risk of the DevOps is that too many people get the right to "break" the platform. Test Driven Infrastructure is about adapting proven ideas from our developer colleagues to the development and operations of Infrastructure services like virtualization, OS provisioning, postfix configuration, httpd configuration, ssh tuning, SAN LUN mounting and others. This talk shows how ImmobilienScout24 utilizes more and more test driven development in IT operations to increase quality and to mitigate the risk of opening up the infrastructure developmen to all developers. ----- Common wisdom has it that the test effort should be related to the risk of a change. However, the reality is different: Developers build elaborate automated test chains to test every single commit of their application. Admins regularly “test” changes on the live platform in production. But which change carries a higher risk of taking the live platform down? What about the software that runs at the “lower levels” of your platform, e.g. systems automation, provisioning, proxy configuration, mail server configuration, database systems etc. An outage of any of those systems can have a financial impact that is as severe as a bug in the “main” software! One of the biggest learnings that any Ops person can learn from a Dev person is Test Driven Development. Easy to say - difficult to apply is my personal experience with the TDD challenge. This talk throws some light on recent developments at ImmobilienScout24 that help us to develop the core of our infrastructure services with a test driven approach: * How to do unit tests, integration tests and systems tests for infrastructure services? * How to automatically verify Proxy, DNS, Postfix configurations before deploying them on live servers? * How to test “dangerous” services like our PXE boot environment or the automated SAN mounting scripts? * How to add a little bit of test coverage to everything we do. * Test Driven: First write a failing test and then the code that fixes it.
  • Published: 2014
  • Publisher: EuroPython
  • Language: English
43:12 REcon English 2011

Checkpoint-Restart: Proprietary Hardware and the "Spiderweb API"

This summary describes a package to transparently checkpoint and restart applications which run over Infiniband. Infiniband is rapidly growing as a high-speed interconnect, even appearing on departmental clusters. The current work grew out of the needs of high performance computing. As of November, 2010, 43% of the TOP500 supercomputers run Infiniband. However, the ability to checkpoint immediately provides access to a poor man's reversible debugger. Using our DMTCP (Distributed MultiThreaded CheckPointing), we can already checkpoint a GDB session today: if we have executed 100 commands since the last checkpoint, we can undo the last instruction by restarting the checkpoint and going forward 99 commands. Since many apps access Infiniband through MPI (Message Passing Interface) instead of direct communication with Infiniband, we also integrated DMTCP into the OpenMPI dialect so as to transparently debug an MPI-based application. Infiniband's primary mechanism to provide fast latency is Remote Direct Memory Access (RDMA). One host can directly read or write the RAM of another host, without intervention by the CPU or software. The previously mentioned debugger logs commands and allows you to go back in history, through restarting and re-executing. It means that we can now conceive of time as a spatial dimension instead of a temporal dimension. So we can write a binary search program acting over the process's lifetime. This is illustrated in a later section. In a complex Infiniband computation, memory is written to and read from with latencies of less than 1 microsecond. Assert statements or breakpoints would change the course of execution because the program no longer runs at native speed.
  • Published: 2011
  • Publisher: REcon
  • Language: English
42:34 REcon English 2011

Hardware Stuff for Software People

This talk will be an introduction to doing "hardware stuff" stuff, for people accustomed to plying their trade against software. I will discuss how to build tools (and use existing tools) to sniff/spy on a variety of hardware communications channels from UART Serial (the kind in your computer) to the very ubiquitous SPI/I2C serial busses used in virtual everything (from EEPROM in your portable DVD player to the HDMI/VGA cables between your computer and monitor). I will demonstrate how these simple hardware taps can be used to begin reverse engineering, spoofing, and fuzzing in places where (as a software person) you might not have previously felt comfortable. I will be bringing along a number of custom hardware and software tools (used specifically for these purposes) as well as a mock lab environment for demonstrations. Other than these practical skills, I am new to this "hardware stuff" so please don't expect a "embedded-JTag-SCADA-mobile" buzzword soliloquy. I'll just be sharing some stories and showing some neat hardware and software I've recently found useful.
  • Published: 2011
  • Publisher: REcon
  • Language: English
1:14:39 REcon English 2011

Internet Filtering

Many countries in the world perform extensive network surveillance, filtering in the form of website blocking or protocol specific censorship; recently many networked authoritarian events in the Middle East/North Africa and across most of the world have come to light. During some specific political uprisings came increased invasive filtering events. I've run a series of tests in many of these countries, during these events with the specific purpose of identifying specific hardware and software in use. Some of the technical details are not novel but their application certainly makes a positive contribution. In some contexts, it's possible to identify specific network links that flag, drop, or inject data at the country level. I intend to show real world data such as block pages, network traces, scans of filters, interesting network blocks and I will discuss techniques for gathering useful data.
  • Published: 2011
  • Publisher: REcon
  • Language: English
13:59 African Institute for Mathematical Sciences (South Africa) English 2014

Topology & Geometry - Lecture 15 Part 01/03

This video forms part of a course on Topology & Geometry by Dr Tadashi Tokieda held at AIMS South Africa in 2014. Topology and geometry have become useful tools in many areas of physics and engineering, and of course permeate every corner of research in today's mathematics. They often help us make fresh progress precisely because they are very unlike, and complement,traditional differential-equation-based methods. Yet they are almost never taught to students outside advanced pure mathematics. This course teaches a minimal amount of topology and geometry of maximal usefulness in applications, relying on pictures and avoiding abstract algebraic machinery. The motto of the course is: look at the generic situation, spot invariants, solve your problem by deformation. I hope that the course will train you to THINK IN PICTURES. Note: Some of you may have studied point-set topology (metric and topological spaces, continuous maps, compactness, etc.). The content of this course is different: it is usually called algebraic and differential topology. This course is designed so that familiarity with point-set topology is unnecessary.
  • Published: 2014
  • Publisher: African Institute for Mathematical Sciences (South Africa)
  • Language: English
25:37 African Institute for Mathematical Sciences (South Africa) English 2014

Topology & Geometry - Lecture 14 Part 02/02

This video forms part of a course on Topology & Geometry by Dr Tadashi Tokieda held at AIMS South Africa in 2014. Topology and geometry have become useful tools in many areas of physics and engineering, and of course permeate every corner of research in today's mathematics. They often help us make fresh progress precisely because they are very unlike, and complement,traditional differential-equation-based methods. Yet they are almost never taught to students outside advanced pure mathematics. This course teaches a minimal amount of topology and geometry of maximal usefulness in applications, relying on pictures and avoiding abstract algebraic machinery. The motto of the course is: look at the generic situation, spot invariants, solve your problem by deformation. I hope that the course will train you to THINK IN PICTURES. Note: Some of you may have studied point-set topology (metric and topological spaces, continuous maps, compactness, etc.). The content of this course is different: it is usually called algebraic and differential topology. This course is designed so that familiarity with point-set topology is unnecessary.
  • Published: 2014
  • Publisher: African Institute for Mathematical Sciences (South Africa)
  • Language: English
34:31 African Institute for Mathematical Sciences (South Africa) English 2014

Topology & Geometry - Lecture 13 Part 01/02

This video forms part of a course on Topology & Geometry by Dr Tadashi Tokieda held at AIMS South Africa in 2014. Topology and geometry have become useful tools in many areas of physics and engineering, and of course permeate every corner of research in today's mathematics. They often help us make fresh progress precisely because they are very unlike, and complement,traditional differential-equation-based methods. Yet they are almost never taught to students outside advanced pure mathematics. This course teaches a minimal amount of topology and geometry of maximal usefulness in applications, relying on pictures and avoiding abstract algebraic machinery. The motto of the course is: look at the generic situation, spot invariants, solve your problem by deformation. I hope that the course will train you to THINK IN PICTURES. Note: Some of you may have studied point-set topology (metric and topological spaces, continuous maps, compactness, etc.). The content of this course is different: it is usually called algebraic and differential topology. This course is designed so that familiarity with point-set topology is unnecessary.
  • Published: 2014
  • Publisher: African Institute for Mathematical Sciences (South Africa)
  • Language: English
31:04 African Institute for Mathematical Sciences (South Africa) English 2014

Topology & Geometry - Lecture 12 Part 02/02

This video forms part of a course on Topology & Geometry by Dr Tadashi Tokieda held at AIMS South Africa in 2014. Topology and geometry have become useful tools in many areas of physics and engineering, and of course permeate every corner of research in today's mathematics. They often help us make fresh progress precisely because they are very unlike, and complement,traditional differential-equation-based methods. Yet they are almost never taught to students outside advanced pure mathematics. This course teaches a minimal amount of topology and geometry of maximal usefulness in applications, relying on pictures and avoiding abstract algebraic machinery. The motto of the course is: look at the generic situation, spot invariants, solve your problem by deformation. I hope that the course will train you to THINK IN PICTURES. Note: Some of you may have studied point-set topology (metric and topological spaces, continuous maps, compactness, etc.). The content of this course is different: it is usually called algebraic and differential topology. This course is designed so that familiarity with point-set topology is unnecessary.
  • Published: 2014
  • Publisher: African Institute for Mathematical Sciences (South Africa)
  • Language: English
27:56 African Institute for Mathematical Sciences (South Africa) English 2014

Topology & Geometry - Lecture 01 Part 01/02

This video forms part of a course on Topology & Geometry by Dr Tadashi Tokieda held at AIMS South Africa in 2014. Topology and geometry have become useful tools in many areas of physics and engineering, and of course permeate every corner of research in today's mathematics. They often help us make fresh progress precisely because they are very unlike, and complement,traditional differential-equation-based methods. Yet they are almost never taught to students outside advanced pure mathematics. This course teaches a minimal amount of topology and geometry of maximal usefulness in applications, relying on pictures and avoiding abstract algebraic machinery. The motto of the course is: look at the generic situation, spot invariants, solve your problem by deformation. I hope that the course will train you to THINK IN PICTURES. Note: Some of you may have studied point-set topology (metric and topological spaces, continuous maps, compactness, etc.). The content of this course is different: it is usually called algebraic and differential topology. This course is designed so that familiarity with point-set topology is unnecessary.
  • Published: 2014
  • Publisher: African Institute for Mathematical Sciences (South Africa)
  • Language: English
20:15 African Institute for Mathematical Sciences (South Africa) English 2014

Topology & Geometry - Lecture 02 Part 03/03

This video forms part of a course on Topology & Geometry by Dr Tadashi Tokieda held at AIMS South Africa in 2014. Topology and geometry have become useful tools in many areas of physics and engineering, and of course permeate every corner of research in today's mathematics. They often help us make fresh progress precisely because they are very unlike, and complement,traditional differential-equation-based methods. Yet they are almost never taught to students outside advanced pure mathematics. This course teaches a minimal amount of topology and geometry of maximal usefulness in applications, relying on pictures and avoiding abstract algebraic machinery. The motto of the course is: look at the generic situation, spot invariants, solve your problem by deformation. I hope that the course will train you to THINK IN PICTURES. Note: Some of you may have studied point-set topology (metric and topological spaces, continuous maps, compactness, etc.). The content of this course is different: it is usually called algebraic and differential topology. This course is designed so that familiarity with point-set topology is unnecessary.
  • Published: 2014
  • Publisher: African Institute for Mathematical Sciences (South Africa)
  • Language: English
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