Yearly Archives: 2017

Unmanned Aerial Vehicles – Innovation and Challenges

 in Cyprus Computer Society / IEEE / Student Branch / Student Clubs / University of Cyprus  tagged Challenges / Innovation / Monitoring Power Systems Lines using Drones / Regulations on drone aviation / UAV in Emergency Response / Unmanned Aerial Vehicles by

The IEEE and the Cyprus Computer Society present the state of art of drone technologies and applications.

3 October 2017
University of Cyprus
Building KOD 07, Room 10
Starts at 17.00
Free Food and Drinks

Presentations:

  • [download id=”3817″]
  • [download id=”3824″]

[download id=”3742″]

[download id=”3743″]

  • Presentations on the state of art of drone technologies & applications
  • Drone Piloting
  • Prize draw for IEEE student members:
    One-day piloting course worth €250, by DJI Cyprus

Program

  • 17:00-17:25: “UAV in Emergency Response: Research and Innovation Challenges”
    Dr. Panayiotis Kolios, KIOS Research and Innovation Center of Excellence
  • 17:25-18:15: “Demonstration of UAV automated functionalities”
    Mr. Petros Petrides, KIOS Research and Innovation Center of Excellence
  • 18:15-18:30: Coffee break
  • 18:30-18:50: “Regulations on drone aviation in Cyprus”
    Mr. Marios Louka, DJI Cyprus
  • 18:50-19:10: “Monitoring Power Systems Lines using Drones”
    Mr. Costas Stasopoulos, EAC, IEEE Region 8 Past-Director
  • 19:10-19:15: “Contribution of Cyprus Computer Society (CCS) in Cyprus”
    Mr. Costas Agrotis, CCS Chairman
  • 19:15-19.30: “Introduction of IEEE: Its Vision and Role”
    Mr. Nicos Michaelides, CYTA, IEEE Cyprus Section Chair
  • 19:30: Drinks and snacks @ U-Pub – Prize draw for IEEE student members

[download id=”3742″]

[download id=”3743″]

Innocence (L’innocence) – William Adolphe Bouguereau (1893)

 in Funny  tagged 1893 / Innocence / L’innocence / William Adolphe Bouguereau by

William-Adolphe Bouguereau’s L’Innocence: Women, young children and lambs are all symbols of innocence.

 

William-Adolphe Bouguereau (November 30, 1825 – August 19, 1905) was a French academic painter and traditionalist. In his realistic genre paintings he used mythological themes, making modern interpretations of classical subjects, with an emphasis on the female human body. During his life he enjoyed significant popularity in France and the United States, was given numerous official honors, and received top prices for his work. As the quintessential salon painter of his generation, he was reviled by the Impressionist avant-garde. By the early twentieth century, Bouguereau and his art fell out of favor with the public, due in part to changing tastes. In the 1980s, a revival of interest in figure painting led to a rediscovery of Bouguereau and his work. Throughout the course of his life, Bouguereau executed 822 known finished paintings, although the whereabouts of many are still unknown.

— From Wikipedia: https://en.wikipedia.org/wiki/William-Adolphe_Bouguereau

CentOS 7: Setup a DHCP server and provide specific IP based on MAC address

 in GNU/Linux  tagged CentOS / daemon / DHCP / mac filter / server / static ip by

Step 1: Install DHCP service

We installed the Dynamic host configuration protocol software (DHCP service) using the command:

yum install dhcp;

The dhcp package provides the ISC DHCP service and relay agent.

Step 2: Configure the DHCP service

Afterwards, we created the file /etc/dhcp/dhcpd.conf using the following content:

subnet 192.168.0.0 netmask 255.255.255.0 {
 option routers                  192.168.0.254;
 option subnet-mask              255.255.255.0;
 option domain-name              "bytefreaks.net";
 option domain-name-servers       192.168.0.1;
 option time-offset              -18000;     # Eastern Standard Time
 range 192.168.0.90 192.168.0.99;
}

host coolServer {
 hardware ethernet 0e:e0:4b:b4:28:82;
 fixed-address 192.168.0.80;
}

This configuration allowed us to provide a DHCP service to the network for the subdomain 192.168.0.x with the range [90,99].
Also, we statically defined the IP for our coolServer using a filter based on the MAC address of the machine.
If you do not want to provide any range, only static IPs, then comment out (#) the line that starts with the word range .

Step 3: Start DHCP service

systemctl start dhcpd.service;

Step 4: Check the status of DHCP service

systemctl status dhcpd.service;

It is a good idea to verify that there are no errors, so be sure to check the status of the service.
You can ignore the error that says “you did not define a subnet declaration for all devices” if you do not really need to do it.

Step 5: Permanently enable the DHCP service

systemctl enable dhcpd.service;

Additional:

Disable the DHCP service

systemctl disable dhcpd.service;

Stop the DHCP service

systemctl stop dhcpd.service;

Bash: After redirected input file is done, allow user to control application via STDIN 1

 in Bash  tagged cli / concatenate / end of file / eof / keyboard / mix / stdin by

Recently, we needed to start an application using a script, which application had its own CLI.
After starting it, we had to feed it with some input to configure it before handing it over to the end user.

The application we used was named dog. We wrote into a plain text file (named food) the commands that we needed to feed the application and then we started the execution using a plain input redirect like so dog < food;.
Doing so, resulted into properly feeding the dog application the food data  but it would cause the application to terminate immediately after the food was done as it would also feed the EOF (End Of File) directive to dog.
Apparently, the application after receiving the EOF, it would then terminate without allowing the end user to take control.

To mitigate the problem, we used the cat command to concatenate the input file along with the stdin stream, permitting us to first feed all the data in the food file and then allow the user to input data using the standard input stream.
Our final command resulted in the following solution as below

cat <(cat food) - | dog;

Where - is the special sign for standard input stdin.
cat food can be of course replaced with other commands that produce output on the standard output (stdout).

A bad side-effect of this solution, is that we lost some functionality of the terminal including, but not limited to, using the backspace and navigation.