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High-frequency Permeability of Fe-Co and Co Granular Composite Materials
Teruhiro Kasagi,Takanori Tsutaoka,Aiko Tsurunaga,Kenichi Hatakeyama 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.62 No.12
The relative complex permeability and permittivity spectra of Fe50Co50 (Permendur) and Cogranular composite materials containing heat-treated particles have been studied in the microwavefrequency range up to 20 GHz. Fe50Co50 granular composite materials have a larger relative permeabilityvalue than Co composites at the same particle content owing to the differences in themagnetizations and the magnetic anisotropies between Fe50Co50 and Co particles. Negative permeabilitydispersions were observed in both composites at frequencies above 6 GHz. The effect of a dcmagnetic field on the permeability spectra revealed that the permeability dispersion of Co compositescould mainly be attributed to the gyromagnetic spin resonance in the microwave range. Fromthe relative permittivity spectrum, these two metal granular composites have a dielectric propertyeven at high particle contents.
A Consideration on Information Floating by Probe Data
Naoyuki KARASAWA,Keisuke NAKANO,Kazuyuki MIYAKITA,Kyosuke KASAGI,Hiroshi TAMURA 대한전자공학회 2015 ITC-CSCC :International Technical Conference on Ci Vol.2015 No.6
In this paper, we consider how to decide places where a message is virtually floated to guide mobile nodes to a certain place in Delay Tolerant Networks. We propose a method to decide the places for Information Floating using probe data. In the proposed method, we estimate the number of visiting nodes by inducement in each place using the volume of traffic between target places. We evaluate the proposed method by computer simulation in a lattice street mobility model.
Precise spectral analysis using a multiple band-pass filter for flash-visual evoked potentials
( Fumitaka Asano ),( Ichiro Shimoyama ),( Yasufumi Kasagi ),( Alex Lopez ) 한국감성과학회 2002 춘계학술대회 Vol.2002 No.-
The fast Fourier transform (FFT) is a good method to estimate spectral density, but the frequency resolution is limited to the sampling window, and thus the precise characteristics of the spectral density for short signals are not clear. To solve the limitation, a multiple band-pass filter was introduced to estimate the precise time course of the spectral density for flash visual evoked potentials (VEPs). Signals were recorded during -200 and 600 ms using balanced noncephalic electrodes, and sampled at 1 K Hz in 12 bits. With 1 Hz and 10 ms resolutions, spectral density was estimated between 10 and 100 Hz. Background powers at the alpha-and beta-bands were high over the posterior scalp, and powers around 200ms were evoked at the same bands over the same region, corresponding to P110 and N165 of VEPs. normalized``s spectral density showed evoked powers around 200 ms and suppressed powers following the evoked powers over the posterior scalp. The evoked powers above the 20Hz band were not statistically significant. However, the gamma band was significantly evoked intra-individually; details in the gamma bands were varied among the subjects. Details of spectral density were complicated even for a simple task such as watching flashes; both synchronization and desynchronization occurred with different distributions and different time courses.