UBV I CCD photometry of NGC 2353 is performed as a part of the "Sejong Open cluster Survey" (SOS). Using photometric membership criteria we select probable members of the cluster. We derive the reddening and distance to the cluster, i.e., E(B - V ) = 0.10 ± 0.02 mag and 1.17 ± 0.04 kpc, respectively. We find that the projected distribution of the probable members on the sky is elliptical in shape rather than circular. The age of the cluster is estimated to be log(age)=8.1 ± 0.1 in years, older than what was found in previous studies. The minimum value of binary fraction is estimated to be about 48 ± 5 percent from a Gaussian function fit to the distribution of the distance moduli of the photometric members. Finally, we also obtain the luminosity function and the initial mass function (IMF) of the probable cluster members. The slope of the IMF is Γ = -1.3 ± 0.2.

UBV I CCD photometry is obtained for the open clusters NGC 4609 and Hogg 15 in Crux. For NGC 4609, CCD data are presented for the first time. From new photometry we derive the reddening, distance modulus and age of each cluster - NGC 4609 : E(B-V ) = 0.37 ± 0.03, V0 - MV=10.60 ± 0.08, log τ = 7.7 ± 0.1; Hogg 15 : E(B - V ) = 1.13 ± 0.11, V0 - MV = 12.50 ± 0.15, log τ ≲ 6.6. The young age of Hogg 15 strongly implies that WR 47 is a member of the cluster. We also determine the mass function of these clusters and obtain a slope Γ = -1.2 (±0.3) for NGC 4609 which is normal and a somewhat shallow slope (Γ =-0.95 ± 0.5) for Hogg 15.

UBVI CCD photometry is obtained for the Ruprecht 93 (Ru 93)region. We are unable to confirm the existence of an intermediate-age open cluster in Ru 93 from the spatial distribution of blue stars. On the other hand, we find two young star groups in the observed field: the nearer one (Ru 93 group) comprises the field young stars in the Sgr-Car arm at d ≈ 2.1 kpc, while the farther one (WR 37 group) is the young stars around WR 37 at d ≈ 4.8 kpc. We derive an abnormal extinction law (RV = 3.5) in the Ruprecht 93 region.