JEFF SZIELENSKI

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Five One Hour Trance Sessions for Coding

August 22, 2018

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Here are a couple solid trance and house sessions to keep you in the zone. #hacktheplanet

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dB vs. dBW vs. dBm Tutorial

Alexander Graham Bell, after which the bel, and therefore the decibel, is named. dB The decibel (dB) is a dimensionless unit used for quantifying the power ratio between two values. The unit is useful for describing the gain or loss in a system. It is used when characterizing amplifiers, attenuators, mixers, or RF chains as a whole. It is based on the bel and is defined as follows: A power ratio is defined as: power ratio = ouput_power / input_power A bel is defined as: power in bels = log10(output_power / input_power) A decibel is 1/10 as large as a bel so ten decibels make up one bel: 1 bel = 10 decibels And therefore power in decibels is defined as: power in decibels = 10 * log10(output_power / input_power) The table below shows the loss/gain as a power ratio compared to the loss/gain in decibels for several different values: The table below shows a amplitude ratio, power ratio (which is just the amplitude ratio squared), and associated dB

Git Client & Server Intranet Configuration How-To

Git is a free and open source distributed version control system designed to handle everything from small to very large projects with speed and efficiency. There are websites like github and bitbucket that host repositories but you can also have your own local repository on your intranet quite easily and for free. Below are the instructions for setting up a Git Client and Git Server on networked Windows 7 machines. Git Server Setup 1. Install Windows 7 32-bit or 64-bit. Set computer name to gitserver. Set IP address to 20.0.0.1. 2. Create user accounts for each git user. All should have administrator privileges. 3. Log on with an administrator account. 4. Right click Windows Explorer icon and select "run as administrator". 5. Create repository directory "c:\repositories". 6. Share repositories directory. Right click "repositories" then "properties"" then "sharing" then "advanced sharing" then click "shar

Algorithm Space and Time Complexities Big-O

I have put together a spreadsheet with the time and space complexities of various algorithms and data structures. This is useful in the design and analysis of algorithms. Download it here: big-o spreadsheet

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2018 (C) Jeff Szielenski