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210 results on '"Hara, Masaaki"'

31. A high speed Viterbi decoder using Path Limited PRML method and its application to 1/2 inch HD full bit rate digital VCR

Author

Hara, Masaaki, Yoshinaka, Tadaaki, Sugizaki, Yasuo, and Ohura, Seiji

Subjects
Decoders -- Design and construction, Business, Electronics and electrical industries, Engineering and manufacturing industries
Abstract

A new algorithm called Path Limited PRML is described, which has been used to implement a high-speed Viterbi decoder LSI. This LEI has been used to realize an experimental 1/2' DVCR at 1.3Gbps.

Published
2001

34. A study of the electrostatic potential on MR heads using metal powder tapes

Author

Ikeyama, Chiaki, Makita, Shinya, Iino, Hiroshi, Sawai, Jun, Hara, Masaaki, and Soda, Yutaka

Subjects
Electromagnetism -- Research, Business, Electronics, Electronics and electrical industries
Abstract

The authors have measured the potential of electrostatic discharge using a commercial VCR drive with metal powder (MP) tapes that are widely used in business. They set up an experimental drive, which has a surface voltage meter and a magneto-resistive read (MR) head with a current-measuring circuit. Using this system, they can measure the surface voltage and current while the tape is running and can investigate how the electrostatic potential from the tape can damage the head. In their assumption that if the media surface voltage is low and current flowing into the head is lower than the sensing current of the head, the MR head can be used in a VCR. It can be not only AMR but may also be giant magnetoresistive and TMR in the future. The results of their experiments show that the peak surface voltage is low and the peak current is only about 3.6 [micro]A with a middle-resistance tape. The peak current is lower than the breakdown current since the sensing current is typically 10 mA. Therefore, an MR head can be used with an MP tape. The authors found that the optimum surface resistance of middle-resistance tape is [10.sup.6] to [10.sup.7]. [OMEGA]sq. Index Terms--Electrostatic, ESD, helical scan tape system, MR head, surface resistance, surface voltage.

Published
2003

35. Analysis of mainland Japanese and Okinawan populations using the Precision ID Ancestry Panel

Author

Nakanishi, Hiroaki, Pereira, Vania, Børsting, Claus, Yamamoto, Toshimichi, Tvedebrink, Torben, Hara, Masaaki, Takada, Aya, Saito, Kazuyuki, Morling, Niels, Nakanishi, Hiroaki, Pereira, Vania, Børsting, Claus, Yamamoto, Toshimichi, Tvedebrink, Torben, Hara, Masaaki, Takada, Aya, Saito, Kazuyuki, and Morling, Niels

Abstract

We typed 165 AIMs in 49 mainland Japanese and 47 Okinawa Japanese using the Precision ID Ancestry Panel (Thermo Fisher Scientific). None of the 165 SNPs showed significant deviation from Hardy-Weinberg equilibrium in the mainland Japanese. One SNP (rs3943253) showed significant deviation from Hardy-Weinberg equilibrium in Okinawa Japanese. Fisher’s exact tests showed that the genotype frequencies of 14 loci were significantly different (p < 0.05) between the two populations before correction for multiple testing. After Bonferroni correction, only rs671 remained statistically significant (p < 0.0003). This SNP is located in the ALDH2 gene. The mutant A allele is associated with increased side effects after alcohol intake. The frequency of the GG genotype (wild type) was higher in the Okinawa Japanese (78.7%) than in mainland Japanese (34.7%; Bonferroni corrected P < 0.001). For 31 (63.3%) of the mainland Japanese and 42 (89.4%) of Okinawa Japanese, the highest population likelihood was obtained with the Japanese reference population. However, only in a few individuals, the likelihoods were significantly different from those calculated using reference data from neighboring populations. The likelihoods for mainland Japanese and Okinawa Japanese were not significantly different from each other for any of the investigated individuals. STRUCTURE and PCA analyses showed that mainland Japanese, Okinawa Japanese, and East Asians could not be differentiated with the Precision ID Ancestry Panel.

Published
2018

37. FRAGMENT SIZE ANALYSIS OF FREE FETAL DNA IN MATERNAL PLASMA USING Y-STR LOCI AND SRY GENE AMPLIFICATION

Author

KIMURA, MACHIKO, HARA, MASAAKI, ITAKURA, ATSUO, SATO, CHIAKI, IKEBUCHI, KENJI, and ISHIHARA, OSAMU

Subjects
Electrophoresis, Prenatal diagnosis, Free fetal DNA, social sciences, geographic locations, Size fractionation
Abstract

Free fetal DNA (ffDNA) in maternal plasma has now become a valuable source for noninvasive prenatal diagnosis. Being able to accurately identify the size of ffDNA in maternal plasma is essential for a noninvasive prenatal diagnosis. Furthermore, it is important to investigate the molecular characteristics related to apoptosis which gives rise to ffDNA. We investigated the fragment size of ffDNA in each sample more precisely, using both Y-STR and SRY primers, in 20 maternal plasma samples from the 17th to 39th weeks of gestation. PCR was conducted with Y-STR and SRY primers which can be used to amplify 100–524 bp fragments. In samples from 10 pregnant women carrying male fetuses, the maximum fragment size detected by Y-STR and SRY primers ranged from 219 to 313 bp. As a result, the mean average maximum fragment size of free fetal DNA detected by Y-STR and SRY primers was 286±28 bp. The Y-STR alleles detected in each maternal plasma DNA sample were all in agreement with the results of their cord blood samples. We concluded that the fragment size of ffDNA comprises 2 nucleosomal complexes or less, but not exceeding 3.

Published
2011

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