How to increase size of DOSBox window?

I am running Turbo C on DOSBox in Ubuntu 12.04.

The problem is that two black stripes are coming on either of screen. I want to remove them.

My computer is a Dell Studio 15z with screen resolution 1366×768. I don’t have a problem even if distortion occurs.

Relevant part of my dosbox.conf file:

[sdl]
fullscreen=true
fulldouble=false
fullresolution=1366x768
windowresolution=1366x768
output=overlay
autolock=true
sensitivity=100
waitonerror=true
priority=higher,normal
mapperfile=mapper-0.74.map
usescancodes=true

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