1 / 20

Resistance is Useless

R. Resistance is Useless. Georg Simon Ohm and Modern Engineering Sciences. Georg Simon Ohm – Monument at TUM. Born on 16.3.1789 in Erlangen Died on 6.7.1854 in Munich. Ohm Resistor. Late Reconition in Germany. Ohm’s Law published the Galvanic Chain – Mathematically Treated – 1827

hija
Télécharger la présentation

Resistance is Useless

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. R Resistance is Useless Georg Simon Ohm and Modern Engineering Sciences

  2. Georg Simon Ohm – Monument at TUM Born on 16.3.1789 in Erlangen Died on 6.7.1854 in Munich

  3. Ohm Resistor

  4. Late Reconition in Germany • Ohm’s Law published • the Galvanic Chain – Mathematically Treated – 1827 • Copley Medal – 1841 • Member Royal Society London – 1842 • Professor for Physics in Munich – 1849 • Bavarian Academy of Sciences – 1850

  5. Ohm‘s Experiment Silk Thread Magnetic Needle Magnifying Lense Mercury Pads for Connecting Copper Wires Bismuth Copper

  6. Ohm‘s Experiment

  7. Experimental Setup – Schematically

  8. Data Acquisition – Measurements Copper wires of length [inches] 2, 4, 6, 10 18, 34, 66 and 130 and of thickness 7/8 inch

  9. The Model

  10. Mathematical Model for Measurement Data • – Strength of magnetic force • – Length of copper wire • – Constant, only dependent on exciting force • – Constant, only dependent on the invariant part of the setup

  11. Experimentally measured data Data calculatedfrommodel

  12. Ohm‘s Law • Scientific discovery in physics via • - empirical measurements followed by • - mathematical modeling • - no explanation of physical processes •  Impact on Modern Engineering Sciences

  13. Modern Engineering Science Black-Box Model measurable observable Output Input Abstract Input-Output Description

  14.  Modeling Human Visual Perception Example: Compressed Digital Video Decoder Encoder (Compression) Data Stream Video Visual Quality Control

  15. Test persons judge visual quality of video  entries in - Vector Subjective Testing

  16. Subjective testing

  17. Black-Box Modeling • Find a (linear) model for input-output relation • measurable features in video  u – variables • observable video quality  y – variable measurbale observable Blur Blocking HVS Subj. Quality Video Input Noise

  18. Black-Box Model for subjective image quality Objective Measurement Subjective test Video [Visual Quality] [Blur, Blocking, Detail, Motion, …,Noise] Blocking Motion Detail Noise Blur Video1 Video2 Video3 Video4 : VideoN PLSR, PCR … Regression- techniques (PCR ≈ SVD)

  19. Results

  20. Thanks

More Related