REVIEWS
BOOK REVIEWS
Information Visualization: Design for Interaction
Service Oriented Architecture for Dummies
Security Metrics
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The latest GNU compiler provides better support for parallel programming, and GCC also rolls out some new optimization features. We took GCC 4.2 for a test drive.
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KNOW-HOW
Motion Detection
The motion detector software, Motion, monitors the video signal from one or multiple cameras and is able to detect whether a significant part of the picture has changed, record and track movement, or launch arbitrary external commands to trigger other actions.
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KNOW-HOW
PowerTOP
Intel’s PowerTOP analysis tool helps optimize power usage and shows you the power guzzlers hiding out on your operating system.
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LINUXUSER
Workspace: wikiCalc
wikiCalc is a unique tool that offers a combination of spreadsheet functionality and wiki features. This may sound like a strange pairing, but wikiCalc provides a refreshingly new approach to the spreadsheet concept.
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KNOW-HOW
ASK KLAUS!
Klaus Knopper is the creator of Knoppix and co-founder of the LinuxTag expo. He currently works as a teacher, programmer, and consultant. If you have a configuration problem, or if you just want to learn more about how Linux works, send your questions to: klaus@linux-magazine. com
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SYSADMIN
Charly's Column
Some weather forecasts give you the temperature and a windchill adjustment, and a similar forecast for bandwidth would be helpful. If you feel the bandwidth is too low – and it always is – you need some kind of measuring instrument to reveal the truth.
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SYSADMIN
Load Average
What is the real meaning of those little “load average” values in the output of shell commands like procinfo and uptime, and what can you do with these numbers?
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PROGRAMMING
Neural Networks
3, 4, 8, 11… ? A neural network can complete this series without knowledge of the underlying algorithm – by a kind of virtual gut feeling. We’ll show you how neural networks solve problems by simulating the behavior of a human brain.
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PROGRAMMING
Perl: Multimeter to Measure Power Consumption
Today’s digital multimeters can do more than measure current and voltage. Multimeters also measure capacity and temperature. An inexpensive multimeter can talk to your PC via the serial port, and simple Perl scripts let you read and visualize data in neat charts.
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