The Taiwanese-American Occultation Survey ( TAOS ) aims to detect serendipitous occultations of stars by small ( \sim 1 km diameter ) objects in the Kuiper Belt and beyond .
Such events are very rare ( < 10 ^ { -3 } events per star per year ) and short in duration ( \sim 200 ms ) , so many stars must be monitored at a high readout cadence .
TAOS monitors typically \sim 500 stars simultaneously at a 5 Hz readout cadence with four telescopes located at Lulin Observatory in central Taiwan .
In this paper , we report the results of the search for small Kuiper Belt Objects ( KBOs ) in seven years of data .
No occultation events were found , resulting in a 95 % c.l .
upper limit on the slope of the faint end of the KBO size distribution of q = 3.34 to 3.82 , depending on the surface density at the break in the size distribution at a diameter of about 90 km .