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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.
Nursing of Children Who Received Shunt Surgery to Treat Hydrocephalus
NISHIMURA Miho,AJIMI Akiko,TKUDA Katsumi 아시아장애사회학회 2008 아시아장애사회학연구 Vol.8 No.-
Hydrocephalus is a condition in which cerebrospinal fluid accumulates in the section of the brain called ventricle in much larger volumes than normal, causing the ventricle to be enlarged and the brain to be under pressure. Many of the children with hydrocephal us receive a surgery called the shunt surgery. There several points to be noted when children with shunt live our normallifestyle. In many cases of hydrocephalus emerging in childhood, it is treated by ventriculo.peritoneal shunt (V.P shunt) surgery. A shunt comprises of a valve and a catheter. By applying an external force , the valve and the catheter may be subjected to pressure. It may case the catheter to become deformed and clogged or damaged. Thus physical activities which may apply pressure on the valve or the catheter or cause some objects to hit them should be avoided. Since the pressure of a programmable valve is adjusted using magnetic force , it may be affected by magnets and so forth. Shunt system can cause shunt troubles. If shunt occlusion or shunt infection occurs, the patient will have symptoms such as headache, vomiting, dizziness, frustration, red swelling of the skin along the catheter and inability to keep balance of the body. If the above symptoms appear, we must suspect a shunt trouble. It may be necessary to caution other children to be careful with a child with shunt when they live together in kindergartens or nursery schools. When nursing children with shunts, the following precautions are required: CD Do not hit the valve or catheter in any way during physical activities. @ Avoid bringing magnets from coming into contact with the valve and strong magnetic fields. @ Do not miss the signs of shunt troubles. @ Inform other children to be careful.
Solvent effect on the excited state of stilbene dendrimers bearing phenylacetylene groups
Nishimura, Yoshinobu,Arai, Tatsuo Korean Society of Photoscience 2014 Rapid communication in photoscience Vol.3 No.4
We studied the characteristics of emissive state of the first (p-G1) and second (p-G2) generation of phenylacetylene dendrimers bearing stilbene as a core by using time-resolved fluorescence spectroscopy in cyclohexane (c-Hex) and N, N-dimethylformide (DMF), which are nonpolar and polar solvents, respectively. Time-dependent red-shift of emission spectra p-G2 both in c-Hex and DMF was observed in comparison with p-G1. Besides, the time constant of red-shift of spectra was found to be larger in DMF than in c-Hex. This indicates that the emissive state of p-G2 has a polar character in DMF as a result of charge delocalization from core to peripheral dendrons followed by stabilization of emissive state.
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.
Nishimura, F .,Morino, K .,Nisitani, H . 대한금속재료학회(대한금속학회) 2000 METALS AND MATERIALS International Vol.6 No.6
In this paper, in order to clarify the effect of crack coalescence for crack growth rate, low cycle fatigue tests were carried out using two kinds of spheroidal graphite cast iron (SGI). Crack propagation behavior from crack initiation to fracture was investigated by observing the surface of specimens and their fracture section. 'The main results obtained are as follows: (1) The variation range in the crack growth curves in SGI is larger than that in its matrix material. This tendency is caused by the occurrence of crack coalescence and the difference in crack initiation length. (2) In most of the cases where the crack growth rate accelerated, there was microshrinkage on the neighboring surface. (3) Crack coalescence is not the main factor in accelerating crack growth rate.