Through the short-period variability survey program, we obtained time-series BV CCD images for 1.5° X 1.0° region around the young open cluster NGC 457. As a result, we have detected 61 variable stars including 31 new ones after checking light curves of all stars by eyes. The 61 variable stars were included 14 δ Scuti variable stars, a β Cephei variable star, 10 variable Be and slowly pulsating B stars, 13 eclipsing binary stars, 21 semi-long periodic or slow irregular variables and an RR Lyrae variable star, respectively. Many variable B-type stars were known through a well-defined zero-age main sequence to the β Cepheid region of NGC 457. Most of the variable B-type stars found this paper were known variable stars. But, 11 out of 14 δ Scuti variable stars were newly discovered. The new variable stars except for δ Scuti stars were 4 variable B-type stars, 5 eclipsing binaries and 11 semi-long periodic or slow irregular variables. We have performed frequency analysis for all δ Scuti stars, a β Cepheid star and an RR Lyrae star.

Through time-series BV CCD photometry of the open cluster NGC 225 region, we have detected 30 variable stars including 22 new ones. They are five δ Scuti-type variable stars, a slowly pulsating B star, six eclipsing binary stars and 18 semi-long periodic or slow irregular variables, respectively. We have performed multiple-frequency analysis to determine pulsation frequencies of the δ Scuti-type stars and a slowly pulsating B star, using the discrete Fourier transform and linear least-square fitting methods. We also have derived the periods and amplitudes of 6 eclipsing binaries and a long-period variable star from the phase tting method, and presented the light curves of all variable stars. A slowly pulsating B star is a member of NGC 225, but δ Scuti-type stars are not members from the positions in the color-magnitude diagram and the radial distancies from the center of the cluster. From Dias et al. (2014, A&A, 564, 79), only three variable stars including the slowly pulsating B star are members of clusters: two are in NGC 225 and one is in Stock 24. But a variable star in Stock 24 is not a member of the cluster because of its position of color-magnitude diagarm.

As a part of the short-period variability survey (SPVS) at Bohyunsan Optical Astronomy Observa- tory, we obtained time-series BV CCD images in the region of the open cluster NGC 1039 (M34). The observations were performed for 22 nights from July 29, 2008 to September 26, 2010. We also made LOAO observations for 10 days from September 18, 2009 to October 30, 2010 to confirm the small variabilties of δ Scuti-type variable stars. In this paper we presented the observational properties of 28 variable stars found in the region. They are seven δ Scuti-type variable stars, two Doradus-type variable stars, four- teen eclipsing binary stars and five semi-long periodic or slow irregular variables, respectively. Only three variables were listed in the GCVS and the rest are newly discovered ones. We have performed multiple- frequency analysis to determine pulsation frequencies of the δ Scuti-type and ɤ Doradus-type variable stars, using the discrete Fourier transform and linear least-square fitting methods. We also have derived the periods and amplitudes of 12 eclipsing binaries from the phase fitting method, and presented the light curves of all variable stars.

This is the second paper on a systematic search for variable stars in Cyg OB3 region. In this paper we present the observational properties of 46 variable stars found in the region. Among them, 27 are eclipsing binaries and others are semi-long periodic or slow irregular variables. Only 5 are known variables and the rest are newly discovered ones. We have obtained the period and amplitude of 20 eclipsing binaries using the phase fitting method, and present the light curves of 46 variable stars.

이 연구에서는 농촌지역에 대한 발전수준을 종합적으로 판단할 수 있는 지표체계를 설정하였으며, 실제 데 이터를 이용해 세 가지 유형의 시ㆍ군 지역 (일반시, 도농통합시, 군)별로 설정된 지표의 수준을 비교, 분석하 였다. 또한 각 지표의 분포가 어떤 통계분포에 적합한지를 시ㆍ군 유형별로 추정하였다. 지표의 체계는, 지역 주민들이 쾌적한 일상생활을 살아가는데 필요한 각종 생활환경시설을 나타내는 생활환경지표와, 지역이 경제 적으로 얼마나 활성화되어 있는가와 지역의 성장에 가장 중요한 인적 자원의 규모와 구조가 어떠한가를 보여 주는 지역활력지표의 2가지로 분류한다. 생활환경지표는 주택, 도로, 상ㆍ하수도 등 생활환경을 대표하는 4개 의 지표로 구성되며, 지역활력지표는 경제, 재정, 인구 등의 부문을 대표하는 5개의 지표로 구성된다. 주택부문 의 수준은 군 지역이 다른 지역보다 더 떨어진 것을 알 수 있었으며, 도로부문의 지표는 일반시가 다른 유형 의 시ㆍ군 지역보다 월등히 높은 것으로 나타났다. 상ㆍ하수도 개발 수준은 일반시가 가장 높으며, 다음으로 도농통합시, 군 지역의 순이다. 고용수준은 군 지역이 가장 높고, 소득의 대리변수로 채택한 1인당지방세액 수 준은 도농통합시가 가장 높게 나타났다. 지방재정의 지표에 있어서는 군 지역이 월등히 높았고, 인구증가율은 일반시와 도농통합시, 군 지역이 정체 상태로 모두 비슷한 수준을 나타내고 있어 유형별로도 별 차이가 없다 는 것을 알 수 있다. 총인구수에 대한 노동가능인구수의 비율에 있어서는 일반시가 가장 높게 나타났다.