"Aviation and Erlang" is a presentation that I gave during BarCamp Shanghai on June 12, 2010. I talked about two fields that I am interested in and I tried to link them together. For the second part of the presentation I was showing some code examples, that are not part of the slide show itself.

1. Aviation and Erlang
Thomas Karsten
barcamp Shanghai, 2010-06-12

2. About me
• Thomas Karsten
• Hometown: Berlin, Germany
• Current location: Shanghai, China
• Developer and scrum master at The
NetCircle
• Aviation, long distance cycling

3. Introduction
• Aviation
• Wind Correction Angle
• Glidepath
• Erlang Server
• TCP Connection
• Erlang Interface
• Aviation and Erlang
• Storage Application

4. 1 Aviation
• All about aircrafts
• Design, Operation, Navigation

5. 1 Aviation
Wind Correction Angle (wca)

6. 1 Aviation
Wind Correction Angle (wca)

7. 1 Aviation
Wind Correction Angle (wca)
vw
v

8. 1 Aviation
Wind Correction Angle (wca)
vw
v

9. 1 Aviation
Wind Correction Angle (wca)
vw
wca
v

10. 1 Aviation
Wind Correction Angle (wca)
vw
wca=atan(vw/v)
with v=150kt, vw=20kt:
wca=7.6
wca
v

11. 1 Aviation
Wind Correction Angle (wca)
vw
v

12. 1 Aviation
Wind Correction Angle (wca)
vw
v

13. 1 Aviation
Wind Correction Angle (wca)
vw
vw90
vw90=sin(wta)*vw
v

14. 1 Aviation
Wind Correction Angle (wca)
vw
vw90
wca=atan(vw90/v)
v

15. 1 Aviation
Glidepath

16. 1 Aviation
Glidepath
120kt=120nm/h=2nm/min
t=10.3nm/2nm/min
t=5.15min

17. 1 Aviation
Glidepath
5000ft/5.15min=971ft/min

18. 1 Aviation
Glidepath
5000ft/5.15min=971ft/min

19. 1 Aviation
Glidepath
(5000ft-1416ft)/5.15min=696ft/min

20. 1 Aviation

21. 2 Erlang Server
Erlang
• Developed at Ericsson 1986
• Open source since 1998
• Distributed, fault-tolerant applications
• Processes are lightweight
• RabbitMQ, ejabberd

22. 2 Erlang Server
TCP Connection
-module(server).
-export([start/0, stop/0]).
-export([listen/0]).
listen() ->
case gen_tcp:listen(Port, ?TCP_OPTIONS) of
{ok, LSocket} ->
NewState=State#state{lsocket=LSocket},
case gen_tcp:accept(LSocket) of
{ok, Socket} ->
do_something(Socket),
{error, Reason} ->
{error, Reason}
end
{ok, NewState};
{error, Reason} ->
{stop, Reason}
end.

23. 2 Erlang Server
Erlang Interface
-module(listen).
-export([start/0, stop/0]).
-export([listen/0]).
start() ->
register(?MODULE, spawn(fun() -> listen() end)).
stop() ->
?MODULE ! stop.
listen() ->
receive
{Pid, Request} ->
io:format("From: ~p~nReceived: ~p~n", [Pid, Request]);
Any ->
io:format("Received: ~p~n", [Any])
end.

24. 2 Erlang Server
Erlang Interface
int main(int ac, char** av)
{
erl_init(NULL, 0);
if (erl_connect_init(1, cookie, 0) == -1)
erl_err_quit("err_connect_init");
if ((fd=erl_connect(node)) < 0)
erl_err_quit("erl_connect: Cannot connect to node");
tuple=create_tuple();
erl_reg_send(fd, RECIPIENT, tuple);
return 0;
}

25. 3 Aviation and Erlang
Code examples

26. 4 Storage Application
Code examples

27. Lessons learned
• How to land an airplane in cross-wind
• Different communication types in Erlang
• How to program a server in Erlang

28. Aviation and Erlang
Thank you very much for listening
Any questions?