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유광일,김순철,이수곤 대한건축학회 2001 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.21 No.2
In the building structures, horizontal floor slabs can be classified as thin rectangular plates. Due to the restraint effect afforded by the edge beams, the plates(or slabs) are neither simply supported nor fixed along the edges. In other words, plates are partially fixed along the edges. The free vibration analysis for the fundamental frequencies of the partially fixed plates is performed by the finite element method. The parameters considered in the analysis are aspect ratio, λ and fixity factors, fx and fy along the edges, respectively. The changes of the frequency are represented by the second order algebraic equation of the above mentioned parameters. The frequencies estimated by the proposed algebraic equation coincide fairly well with those obtained by finite element analysis. The fundamental frequency of a slab can be determined through an on-site vibration test. Once the frequency is known, the fixity factors, fx and fy can estimated by using the proposed algebraic equation. The estimated fixity factors will help the structural engineers better assesment of the bearing capacity and serviceability of the slab.
한국 미기록 부유성 요각류 Paracalanus gracilis
유광일,이원철 ( Kwang Il Yoo,Won Cheol Lee ) 한국환경생물학회 1994 환경생물 : 환경생물학회지 Vol.12 No.2
During the survey of the copepod community in Korean waters, Paracalanus gracilis, a planktonic calanoid copepod, appeared to near the East China Sea and off the East coast of Korea. P. gracilis not reported from the world ocean, except the first record by Chen & Zhang(1965). Authors report the occurrence of this species in the neighbouring waters of Korean Peninsula and describe it.