High-Resolution Observations of the Molecular Clouds Associated with the
  Huge HII Region CTB 102
  We report the first high-resolution (sub-arcminute) large-scale mapping
$^{12}$CO and $^{13}$CO observations of the molecular clouds associated with
the giant outer Galaxy HII region CTB~102 (KR 1). These observations were made
using a newly commissioned receiver system on the 13.7-m radio telescope at the
Taeduk Radio Astronomy Observatory. Our observations show that the molecular
clouds have a spatial extent of $60 \times 35$ pc and a total mass of $10^{4.8}
- 10^{5.0}$ M$_\odot$. Infrared data from WISE and 2MASS were used to identify
and classify the YSO population associated with ongoing star formation activity
within the molecular clouds. We directly detect 18 class I/class II YSOs and
six transition disk objects. Moving away from the HII region, there is an
age/class gradient consistent with sequential star formation. The infrared and
molecular-line data were combined to estimate the star formation efficiency
(SFE) of the entire cloud as well as the SFE for various sub-regions of the
cloud. We find that the overall SFE is between $\sim5 - 10$%, consistent with
previous observations of giant molecular clouds. One of the sub-regions, region
1a, is a clear outlier, with a SFE of 17 $-$ 35% on a 5 pc spatial scale. This
high SFE is more typical for much smaller (sub-pc scale) star-forming cores,
and we think region 1a is likely an embedded massive protocluster.
