Preliminary time-series observations for short-period variability survey (SPVS) were carried out using a 155mm refractor and a 2k×3k CCD camera at Bohyunsan Optical Astronomy Observatory. We found 21 new variable stars in the 90′×60′ test field region : 9 eclipsing binary stars, 5δ Scuti type stars, a γ Doradus type star, and 6 long period variables. The observing field center is R.A. 05 h00m00s, DEC. 50∘00′00" (J2000.0). The period and amplitude ranges for the short-period variables, i.e., δ Scuti stars, were 0.052day - 0.107day and 0.012mag - 0.064mag, respectively.

Time-series observations were carried out using a 155mm refractor and a 2k×3k CCD camera at Bohyunsan Optical Astronomy Observatory. We found 38 new variable stars in the 2.3°×2.4° region around the Cepheid variable TU Cas: 22 eclipsing binary stars, 11 δ Scuti type stars and an RR Lyrae star, and 4 unclassified variables.

Through time-series CCD photometry using a 130mm refractor of Busan Science Academy, we found a new δ Scuti type variable star, esc 03665-00576. We performed following observations using a 1.8m telescope of Bohyunsan Optical Astronomy Observatory. Three frequencies have been derived by multiple-frequency analysis, which are 10.968, 7.156 and 15.182cycle day−1, respectively. V-amplitude of esc 03665-00576 is ΔV= 0.04.

Through time-series CCD photometry using a 155mm refractor, we found a new δ Scuti type variable star, HD 235428, near a known bright δ Scuti type star, DQ Cep. We performed follow-up observations using a 61cm telescope at Sobaeksan Optical Astronomy Observatory. Four frequencies have been derived by multiple-frequency analysis, which are 15.804, 5.498, 15.351 and 24.516cycle day−1 , respectively. V-amplitude of HD 235428 is ΔV = 0.026.