Thermocouple made from a nail and copper wire.

Thermocouple is a simple device to measure temperature by using Seebeck effect where a current is created in a heated conductor. The amount of current depends on temperature and the material from which the conductor was made. It's a common tool when...

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Is it possible to write a program in C without using semicolons?

Yes, it's possible! In this text I will show a set of tricks to do it. I will present this on a simple program that that reads two numbers from STDIN and prints theirs sum to the STDOUT. Normally I would start this program from declaring two variables: int a, b; Unfortunately, there's a semicolon...

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Breaking CAPTCHA in Python

Usually CAPTCHAs are analyzed by using neural network, it's a good approach, but it may be overcomplicated in simple cases. Presented below, much shorter algorithm can produce sufficient results for uncomplicated CAPTCHAs. In this algorithm an image...

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Edge Detection by using Genetic Algorithms

Abstract In this post I will present an algorithm for searching edges in images by using genetic approach. Algorithm The image is preprocessed before its usage, firstly Gaussian blur is used to remove small artifacts that could pollute the result....

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Virtual Machine implemented as a Domain Specific Language in Ruby

Abstract Some time ago I created a simple programming language that was compiled to its own assembly language, a file in this assembly language could be executed in a Virtual Machine or be compiled to an executable form. Today I will present an idea how to use Domain Specific Language (DSL) created...

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Motion estimation in super-resolution algorithms

Abstract One of important steps in super resolution algorithms is the estimation of initial constants, without this the algorithms will produce useless higher resolution images. From mathematical view, we may say that during taking a photo, the original...

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How to prevent this program from printing anything?

Place something instead of blanks to prevent below program from printing anything. #include <stdio.h> int main() { if (     ) { printf("foo"); } else { printf("bar"); } return 0; ...

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German tank problem

Sometimes science is applied in really amazing ways, one of examples is German tank problem. During World War II, the Allies observed that the Nazis created a new model of tank. Total number of manufactured units was unknown, but the Allies, know serial numbers of some tanks. In this case, the first...

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Zapper built from NAND gates

Zapper, what's that? The zapper is a simple device intended to fight against parasites that, if present in the human body, can do a lot of harm. As far as I know, it's not proved by any scientific source that it actually works, and despite time, it still...

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