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Dynamic Simulation of Product Deformation in Rapid Prototyping
Kishinami, Takeshi,Tanaka, Fumiki,Tadaki, Toshihide 대한기계학회 1996 International Sessions in Celebration of the 50th Vol.1 No.1
One of the most important factors in determining accuracy in stereolithography is the deformation phenomenon caused by the volume shrinkage of resins that accompanies photopolymerization. The objective of the work described in this paper is to perform finite element analysis of this deformation of parts built by stereolithography. We propose an element division method for the analysis of shape and dynamic resin material models based on the properties of resin after photopolymerization. Utilizing these, we will demonstrate simulation parts building, and demonstrate the usefulness of them and influence of their parameters on the deformation of parts.
PANORAMIC VIEWS OF GALAXY CLUSTER EVOLUTION: GALAXY ECOLOGY
Kodama, Tadayuki,Koyama, Yusei,Hayashi, Masao,Ken-ichi, Tadaki The Korean Astronomical Society 2010 天文學論叢 Vol.25 No.3
Taking the great advantage of Subaru's wide field coverage both in the optical and in the near infrared, we have been providing panoramic views of distant clusters and their surrounding environments over the wide redshift range of 0:4 < z < 3. From our unique data sets, a consistent picture has been emerging that the star forming activity is once enhanced and then truncated in galaxy groups in the outskirts of clusters during the course of cluster assembly at z < 1. Such activity is shifted into cluster cores as we go further back in time to z ~ 1.5. At z = 2 - 2.5, we begin to enter the epoch when massive galaxies are actually forming in the cluster core. And by z ~ 3, we eventually go beyond the major epoch of massive galaxy formation. It is likely that the environmental dependence of star forming activity is at least partly due to the external environmental effects such as galaxy-galaxy interaction in medium density regions at z < 1, while the intrinsic effect of galaxy formation bias overtakes the external effect at higher redshifts, resulting in a large star formation activity in the cluster center.