  Variable stars, or particularly eclipsing binaries, are very essential
astronomical occurrence. Surveys are the backbone of astronomy, and many
discoveries of variable stars are the results of surveys. All-Sky Automated
Survey (ASAS) is one of the observing projects whose ultimate goal is
photometric monitoring of variable stars. Since its first light in 1997, ASAS
has collected 50,099 variable stars, with 11,076 eclipsing binaries among them.
In the present work we focus on the period determination of the eclipsing
binaries. Since the number of data points in each ASAS eclipsing binary light
curve is sparse, period determination of any system is a not straightforward
process. For 30 samples of such systems we compare the implementation of
Lomb-Scargle algorithm which is an Fast Fourier Transform (FFT) basis and Phase
Dispersion Minimization (PDM) method which is non-FFT basis to determine their
period. It is demonstrated that PDM gives better performance at handling
eclipsing detached (ED) systems whose variability are non-sinusoidal. More
over, using semi-automatic recipes, we get better period solution and
satisfactorily improve 53% of the selected object's light curves, but failed
against another 7% of selected objects. In addition, we also highlight 4
interesting objects for further investigation.
