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이우일 空軍士官學校 2001 論文集 Vol.48 No.-
Clustering is a property to put the logically related objects, which are likely to be accessed together, in the physically same page, And it is necessary to improve a query processing performance. Also, high storage utilization of the index structure keeps its height low so that the number of pages accessed by a query becomes small. Accordingly, for efficient processing of spatial queries, spatial access methods must not only have the clustering property but also guarantee high storage utilizations. In this paper, we show that the center transformation technique, a kind of SAMs, has the clustering property. Futhermore, we compare the split patterns and storage utilizations of the center transformation technique with those of the corner transformation technique. As a resutl, we show that the center trasnsformation technique is more suitable for uneven distribution of spatial objects such as real data
이우일,우정옥 경북대학교 전자기술연구소 1993 電子技術硏究誌 Vol.14 No.1
TiO₂ films for window material of color sensor have been fabricated by RF reactive sputtering method onto glass substrate. TiO₂ films were investigated under the different deposition conditions. The optimum depositions of TiO₂ films for window material of color sensor were such that RF power was 120 W, substrate temperature was 100℃, oxygen concentration was 50%, working pressure was 50 mTorr, and thickness was 1000 Å. In this case, the optical transmittance of TiO₂ films at 550 ㎚ wavelength was 85%, resistivity was 2×10^9 Ω·㎝, refractive index was 2.3, and optical bandgap was 3.58 eV. The imposition ratio of O to Ti by AES analysis was 1.7. When TiO₂ films were annealed at 400℃ for 30 min. in O₂ ambient, the optical transmittance characteristics of TiO₂ films at 300㎚∼580㎚ wavelength were improved from 0 % bo 25 %.