blog dds

2016.12.02

Computer vs Human 0-1

Earlier today the Athens State Orchestra played the Symphony No. 3 in C minor, Op. 78 by Camille Saint-Saens, which is also known as the Organ Symphony. The French organist and composer Thierry Escaich was supposed to play the organ. There was a slight delay at the beginning: a lady appeared on stage and explained that there were technical problems with the organ's "brain".

Continue reading "Computer vs Human 0-1"

2016.11.17

The State of Software Engineering Research

At the 2016 Foundations of Software Engineering conference, a panel discussed the state of software engineering research. The panelists were asked to reflect on three questions.

Continue reading "The State of Software Engineering Research"

2016.10.27

Netdata on a Raspberry Pi

A couple of days ago I had the privilege to see a demo of netdata by Costa Tsaousis, the person behind this project. The project offers comprehensive real time monitoring of a Linux computer with low overhead in a single easily-installed and self-contained system. I thought this was too good to be true, but the number of users and installations hinted that this could well be the case. I therefore decided to install the system on a Raspberry Pi I'm configuring to replace an ancient 20 year old IBM PS/2 server.

Continue reading "Netdata on a Raspberry Pi"

2016.10.13

Debugging a File Synchronization Problem

In Effective Debugging I write that if a web search doesn't return you any useful results, then maybe you're barking at the wrong tree. Here's an example.

Continue reading "Debugging a File Synchronization Problem"

2016.09.13

Revision Control Smells

As software developers, we talk about code smells, design smells, and even configuration smells. While reviewing some code, it occurred to me that revision control smells are also distinguishable and important. Here are some obvious ones and my recommendations for avoiding them. An orderly revision control repository is a sign of professionalism.

Continue reading "Revision Control Smells"

2016.05.07

The Computer Tube

I've been reading the book ENIAC in Action, which details the fascinating ten-year history of the first general-purpose programmable electronic computer. In it I found a reference to 7AK7, the so-called computer tube, which improved the reliability of tube computers.

Continue reading "The Computer Tube"

2016.03.18

Verifying the Substitution Cipher Folklore

A substitution cipher has each letter substituted with another. Cryptography folklore has it that simple substitution ciphers are trivial to break by looking at the letter frequencies of the encrypted text. I tested the folklore and the results were not quite what I was expecting.

Continue reading "Verifying the Substitution Cipher Folklore"

2015.12.13

Raspberry Pi vs USB vs Mac Audio

The audio hardware of Raspberry Pi is known to produce relatively poor sound quality. I bought a cheap USB sound card to try as an alternative. Here is what I found.

Continue reading "Raspberry Pi vs USB vs Mac Audio"

2015.11.29

Raspberry Pi Zero vs Elliott 405

Twitter users @SadHappyAmazing and @HistoricalPics posted yesterday two photographs (copy) showing the Raspberry Pi Zero juxtaposed in front of the Norwich City Council Treasurer's Department building, where the delivery of the Elliott 405 computer was photographed in 1957. Here is how the two computers compare.

Continue reading "Raspberry Pi Zero vs Elliott 405"

2015.06.28

Impact Factor of Computer Science Journals 2014

The Thomson Reuters Web of Knowledge has published the 2014 Journal Citation Reports. Following similar studies I performed in the past eight years (2007, '08, '09, '10, '11, '12, '13, '14) here is my analysis of the current status and trends for the impact factor of computer science journals.

Continue reading "Impact Factor of Computer Science Journals 2014"


Creative Commons License Last update: Saturday, December 3, 2016 0:26 am
Unless otherwise expressly stated, all original material on this page created by Diomidis Spinellis is licensed under a Creative Commons Attribution-Share Alike 3.0 Greece License.