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Analysis of Ti-Silicide Formation with a Thin Ta Interlayer on Si (100)
전형탁,HeykyoungWon,YangdoKim,JaeseobLee,R.J.Nemanich 한국물리학회 2002 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.40 No.5
The phase formation of Ti-silicide with a Ta interlayer deposited on Si (100) substrates has been studied. The Ti layer of 100 A was deposited on top of a 5 A Ta interlayer on a Si (100) substrate. After metal deposition, the Si substrate was in-situ annealed at temperatures between 580 and 830 C. Ti-silicides were formed and analyzed with using X-ray diractometer (XRD), scanning electron microscope (SEM), Auger electron spectroscopy (AES), and transmission electron microscope (TEM) to verify the phase transition and the surface and interface morphologies. The change in the temperature of the phase transition from C49 to C54 TiSi2 was observed. The C49 to C54 TiSi2 phase transition temperature was below 630 C for the samples with the Ta interlayer and was about 830 C for the samples without the Ta interlayer. The temperature of the phase transition from C49 to C54 TiSi2 with the Ta interlayer was observed to be lowered by about 200 C. The AES data showed a 1:2 ratio of Ti:Si in the Ti-silicide layer and indicated that the Ta layer remained at the interface between TiSi2 and the Si (100) substrate. A retarded agglomeration of Tisilicide was observed with the Ta interlayer. The present results for Ti-silicide with a Ta interlayer conrmed that the areal coverage and island morphologies of TiSi2 on Si (100) were uniform and smooth.
A Method for Data-mining of Defects on Building Façade Elements
Jaeseob Lee,Yongdeok Jeon,Kichang Jeong,Yeonwoo Shin,Wooram Kim 보안공학연구지원센터 2016 International Journal of Smart Home Vol.10 No.12
It has been recognized that the value of buildings gradually decreases over time due to aesthetic, functional, and structural deteriorations caused by various defects. In response to these deteriorations, the value of buildings can be restored by various types of maintenance operations. However, minimizing depreciation is better than maintenance. In this regard, the defects that cause depreciation should be reduced through data analysis on existing buildings. This study suggests the “Pixelization Method (PM)” for data mining on building façade elements to collect data on façade defects. PM is a technique that supports the creation of a database by simplifying the analysis of building façades as well as the input data. The database, developed with PM, is expected to be used in various areas such as analysis of the relationship between the defects and the facade elements or the prediction of defects.