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Nishihara, Kazuharu,Okada, Hiraku,Yamazato, Takaya,Katayama, Masaaki 통신위성우주산업연구회 2003 Joint Conference on Satellite Communications Vol.2003 No.-
To increase the channel efficiency, most of the Low Earth-Orbital satellite (LEOs) systems use the multibeam antenna and reuse the available channels. But in such systems, a beam handover occurs very frequently and a dropping probability becomes very high compared with the one beam systems. In this paper, we propose the nondropping handover and channel allocation scheme in the above LEOs systems. In the proposed scheme, we allocate an extra idle channel for a new call. Because of the predictable change of channel reuse distances, each user can always use the same channel as before. Furthermore, we proposed some cost functions used by channel selection and channel reassignment. For comparison, we show the lower bound of blocking probability by maximal complete dependent set (MCDS). We confirm that the proposed channel selection scheme improves the system performance by computer simulation.
A HAHN-BANACH EXTENSION THEOREM FOR ENTIRE FUNCTIONS OF NUCLEAR TYPE
Nishihara, Masaru Korean Mathematical Society 2004 대한수학회지 Vol.41 No.1
Let Ε and F be locally convex spaces over C. We assume that Ε is a nuclear space and F is a Banach space. Let f be a holomorphic mapping from Ε into F. Then we show that f is of uniformly bounded type if and only if, for an arbitrary locally convex space G containing Ε as a closed subspace, f can be extended to a holomorphic mapping from G into F.
Shougo Nishihara,Takashi shiga,Jun Nishihiro 국립중앙과학관 2023 Journal of Asia-Pacific Biodiversity Vol.16 No.2
Aldrovanda vesiculosa L. is a globally endangered aquatic plant, with only two reintroduced populations known in Japan. In October 2022, we found a population of this species with nearly 10,000 individuals in an agricultural pond in Ishikawa Prefecture. This paper describes the estimated population size, habitat conditions, and the results of a genetic comparison with other populations by comparing its nrDNA (internal transcribed spacer) and cpDNA (trnL intron and trnLetrnF spacer) sequences. All the DNA sequences from voucher specimens and GenBank data, including the population discovered in the present study, were identical. Based on the evidence, we presume that this A. vesiculosa population is a wild one.
Koki Nishihara,Ryoko Kobayashi,Yutaka Suzuki,Katsuyoshi Sato,Kazuo Katoh,노상건 아세아·태평양축산학회 2017 Animal Bioscience Vol.30 No.12
Objective: In the present study, we examined whether the post-prandial reduction in plasma growth hormone (GH) levels is related to the increase in plasma insulin levels in ruminants. Methods: We performed two experiments: intravenous bolus injection of insulin (0.2 IU/kg body weight) or glucose (1.0 mmol/kg body weight) was administered to increase the plasma insulin levels in male Shiba goats. Results: In the insulin injection experiment, significant (p<0.05) increase in GH concentrations was observed, 15 to 20 min after the injection; it was accompanied with a significant (p<0.01) increase in cortisol concentrations at 45 to 90 min, when compared to the concentrations in the saline-injected controls. The glucose injection significantly (p<0.05) increased the plasma GH concentration at 20 to 45 min; this was not accompanied by significantly higher cortisol concentrations than were observed for the saline-injected control. Hypoglycemia induced by the insulin injection, which causes the excitation of the adrenal cortex, might be involved in the increase in insulin levels. Conclusion: Based on these results, we conclude that post-prandial increases in plasma insulin or glucose levels do not induce a decrease in GH concentration after feeding in the ruminants.