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GALAXY LUMINOSITY FUNCTION OF THE DYNAMICALLY YOUNG ABELL 119 CLUSTER: PROBING THE CLUSTER ASSEMBLY
Lee, Youngdae,Rey, Soo-Chang,Hilker, Michael,Sheen, Yun-Kyeong,Yi, Sukyoung K. American Astronomical Society 2016 The Astrophysical journal Vol.822 No.2
<P>We present the galaxy luminosity function (LF) of the Abell 119 cluster down to M-r similar to -14 mag based on deep images in the u, g, and r. bands taken by using MOSAIC II CCD mounted on the Blanco 4 m telescope at the CTIO. The cluster membership was accurately determined based on the radial velocity information and on the color-magnitude relation for bright galaxies and the scaling relation for faint galaxies. The overall LF exhibits a bimodal behavior with a distinct dip at r similar to 18.5 mag (M-r similar to -17.8 mag), which is more appropriately described by a two-component function. The shape of the LF strongly depends on the clustercentric distance and on the local galaxy density. The LF of galaxies in the outer, low-density region exhibits a steeper slope and more prominent dip compared with that of counterparts in the inner, high-density region. We found evidence for a substructure in the projected galaxy distribution in which several overdense regions in the Abell 119 cluster appear to be closely associated with the surrounding, possible filamentary structure. The combined LF of the overdense regions exhibits a two-component function with a distinct dip, while the LF of the central region is well described by a single Schechter function. We suggest that, in the context of the hierarchical cluster formation scenario, the observed overdense regions are the relics of galaxy groups, retaining their two-component LFs with a dip, which acquired their shapes through a. galaxy merging process in group environments, before they fall into a cluster.</P>
An intergrated Power Control for Cellular Mobile Network Using an Immune Algorithm(ICPE'04)
YoungDae Lee,KeeHwan Kim 전력전자학회 2004 ICPE(ISPE)논문집 Vol.- No.-
Various information services such as file and image service including voice, email transmission are needed for future cellular networks. In order to support these services with various rate and quality of service, efficient use of the available wireless resource is essential. The biological immune system is expected to provide various feasible ideas to many engineering fields. From the view point of engineering, biological immune algorithm can be recognized as an adaptive optimization system on the various dynamic environments. This paper reports an ongoing work inspired by immune algorithm to maximize the cellular network capacity by integrating transmission rate allocation and a suggested rapid power control algorithm. Computer simulation results showed the validity of the proposed algorithm
A Robust Inverse Kinematics Scheme for Six Axis Robot with Wrist Offset (ICPE’04)
YoungDae Lee,KumBae Cho 전력전자학회 2004 ICPE(ISPE)논문집 Vol.- No.-
This paper proposes a novel algorithm to solve inverse kinematics solution of the six axis robot with non spherical wrist. We have found some shortcomings of the conventional methods in finding inverse kinematics solution. They do not consider the feasible regions of solutions and often falls into local points. In this paper, we got the feasible and exact inverse kinematics solution by assuming that the PUMA robot has a wrist offset. A unidirectional search algorithm is proposed considering the feasible range of<br/> solution. Thus, our algorithm overcomes shortcomings of the<br/> conventional algorithms and guarantees to find the exact solution robustly without errors. Computer simulation results show the validity and efficiency of our approach.