Blogs de Ciência

The fuzzy logic is a generalization of classic sets theory.In the classic sets theory, a element is in a set or not.For example, the fruit's universe, the orange is in set of citric fruits, and the apple is not in that set.But, if we analyze the people's universe and make 2 sets: rich people and poor people. If anyone has more than US$ 500,000.00, that's rich, if anyone has less than US$ 500,000.00, that's poor.Thus, someone has US$10,000.00; US$30,000.00; US$50,000.00; US$70,000.00; US$100,000.00; US$120,000.00; US$180,000.00; US$210,000.00; US$220,000.00; US$300,000.00; US$450,000.00; US$480,000.00; US$492,000.00; US$497,000.00; US$499,800.00; US$499,930.00; US$499,981.00; US$499,996.00; US$499,999.20; US$499,999.98; that's a poor people. And other someone has US$1,000,000.00; US$980,000.00; US$840,000.00; US$770,000.00; US$680,000.00; US$610,000.00; US$590,000.00; US$540,000.00; US$510,000.00; US$508,000.00; US$502,000.00; US$501,000.00; US$500,100.00; US$500,010.00; US$500,001.00; US$500,000.10; that's a rich people.But, let's think: if anyone has US$499,999.97 and other one has US$500,000.01 they have the same money, because US$0.04 is almost no money, but they aren't in same set.The fuzzy logic add the pertinence concept for each element. So, all elements are in all sets, but each element has a specific pertinence in each set.We can use fuzzy logic in any situation, ...

GPIB (General Purpose Interface Bus) is a communication interface between diferents devices, as USB, serial port, parallel port, etc....The National Instrument$ and Angilent ($$$) support this interface (developing drivers and aplications), this is the first and problably the last post that I do about anything that use proprietary software, I want only show that is possible use free software in this type of situation.So, the GPIB was developed by cientists, for your devices, and they earn rates about 5MB/s (yes, 5 Mega Bytes). Few time later the IEEE maked the standard IEEE-488.This standard is very commom is devices of materials analysis, radio-frequency, etc.... those are used in "down engeneering".But the Scilab has a toolbox for GPIB systems (here) and it works on GNU/Linux (if the toolbox doesn't work on GNU/Linux I don't make this post)!About the GPIB:Supports until 32 devices simultaneously;In a GPIB network exists 3 types of elements: talkers, listeners and controllers;Each device can be acessed and controlled individually.For GNU/Linux developers, exists free libraries for GPIB developing to C/C++ and Python languages.I'm having sucess with Scilab and GPIB.Finishing: we don't need use MetLab ...

This is my first post in english. I like the Scilab, so it's the subject of this post.The Scilab is a simulation enviroment to numeric computation, i. e., the Scilab have many resources to solve complicated problems.Examples of aplications that I work in Scilab:Neural networks;Genetics Algorithms;Analysis os temporal series (in economy);Digital images and signals processing;Computational vision;Electromagnetism.The most important work that I developed was a new algorithm to detect and localize critical points in digital images, I have used details enhacement in this work and the classical technics uses boundary analysis.The Scilab has many toolboxes, for example: SIVP - Scilab Image and Video Processing toolbox and SWT - Scilab Wavelets Toolbox (this have functions for signals and images). The Scicos is a graphical simulation enviroment, this is on the Scilab (called by "scicos" in prompt), with the Scicos is possible to develop "getting blocks", this is a easy and fast mode to work.To finish, the Scilab is a free software and doesn't have less resources than proprietary softwares.