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Nishimura,Y.,Suzuki,S.,조백현,박진수,김병묵 大韓成形外科學會 1995 Archives of Plastic Surgery Vol.22 No.4
The general principle of treating a giant pigmented nevus is total resection of the lesion to prevent malignant change, followed by coverage of the skin defect with either flap or free skin graft. The problem in giant pigmented nevus lies in that enough skin to cover such a large defect is not readily available. The authors have developed a bilayer artificial skin composed of an upper silicone sheet and a lower collagen sponge sheet, and have applied it clinically with success. In using the artificial skin, the lower sheet is spontaneously converted to synthesized connective tissue matrix similar to dermis through the invasion of fibroblasts and capillaries, which allows for an easy take of a secondary skin graft. There is no significant histological and cosmetic difference between the area treated with the artificial skin plus very thin split thickness skin graft(0.2mm) and that treated with ordinary split thickness skin graft(about 0.5mm). Our recent experience with the use of an artificial skin combined with a very thin split thickness skin graft would be the best solution of the problem, at least at this stage of the research development, because it permits harvesting skin graft from the same site twice or more times, multiplying the usable skin areas in effect.
Gradient-Based Complex Adaptive IIR Notch Filters for Frequency Estimation
Nishimura, Shotaro,Jiang, Hai Yun 대한전자공학회 1996 APCCAS:Asia Pacific Conference on Circuits And Sys Vol.1 No.1
In this paper, we present a new structure for complex adaptive IIR notch filter which is useful for the detection of complex sinusoids in communication and radar systems. The proposed structure is based on the direct form first-order complex notch filter using gradient-based algorithm. A quantitative analysis for convergence properties is developed. It has been shown that the convergence speed does not depend on the variance of input white noise. The effects of colored Gausaian noise to convergence speed have been analyzed. By using the proposed first-order section, a new cascaded structure for complex adaptive notch filter is also shown. The results of computer simulation are shown which confirm the theoretical prediction.
Photodynamics of an excited triplet state in the presence of molecular oxygen cluster
Nishimura, Yoshinobu Korean Society of Photoscience 2013 Rapid communication in photoscience Vol.2 No.3
Bulk nanobubble is one of the nanoscopic gaseous state found in the solution. We measured transient absorption spectra of eosin Y in the excited triplet state ($^3EY^{2-*}$) to elucidate differences in the dissipation process of the bulk nanobubble of oxygen molecule at air pressure. The time dependence of the oxygen dissipation process was classified three time domains (P1, P2 and P3). The comparison of ordinary bubbling method gave different results at P3 in contrast to similar results at P1 and P2, indicating the existence of characteristic dissolving state in the case of nanobubble.