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Michiharu Niimi,Shinpei Noda,Hideki Noda 대한전자공학회 2009 ITC-CSCC :International Technical Conference on Ci Vol.2009 No.7
We have proposed a lossless information hiding method for binary images. A half of pixels in noisy blocks on cover images is candidate for embeddable pixels. Among the candidate pixels, we select compressive pixels by bit patterns of its neighborhood, which is called as neighborhood bit pattern, to compress the pixels effectively. Thus, embeddable pixels in our method are compressive pixels in noisy blocks. This paper reports the influence of block size and neighborhood bit pattern on our method.
Reaction Evaluation of Metal Surface Using Surface Potential Distribution Measurement
Youhei Hirohata,Ayumu Yokota,Kazuhiko Noda,Hideki Katayama,Hiroyuki Masuda 한국표면공학회 2010 한국표면공학회 학술발표회 초록집 Vol.2010 No.11
A surface potential measurement device with non-contact probe is applied to measure the potential of the passive metals. The surface potential distribution of high corrosion resistance materials shows difference behavior between titanium and type 304 stainless steel. From these results, the measurement of the surface potential using a surface potential measurement device is quite suitable to investigate the atmospheric corrosion behavior of high corrosion resistance materials.
Initial Corrosion Behavior of Galvanized Steels in Atmospheric Environment
Ayumu Yokota,Youhei Hirohata,Kazuhiko Noda,Hideki Katayama,Hiroyuki Masuda 한국표면공학회 2010 한국표면공학회 학술발표회 초록집 Vol.2010 No.11
The corrosion prevention mechanism of Zn/Fe galvanic couple changes with time and have been investigated by atmospheric exposure tests and surface potential distribution measurement. The samples used in experiment were non-chromate treated galvanized steel and chromate treated galvanized steel. Corrosion products were observed on the surface of non-chromate treated galvanized steel after atmospheric exposure tests. On the other hand, the corrosion products were not observed on the surface of chromate treated galvanized steels. The experimental results show that chromate conversion treatments increase corrosion resistance of the galvanized steel. The sacrificial anodic reaction in non-chromate treated galvanized steels was seen at the Zn/Fe boundary. However, the effect of corrosion prevention by the sacrificial anodic reaction was less seen on chromate treated galvanized steels. From these results, chromate conversion treatments increase the corrosion resistance of the coatings, while decreasing the effect of sacrificial anodic reaction at the Zn/Fe boundary. The expansion of sacrificial anodic reaction was confirmed by surface potential distribution measurement due to the corrosion product at the Zn/Fe boundary.