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Hirata, M.,Iwamoto, T.,Otozu, W.,Kiyota, D. Asian Australasian Association of Animal Productio 2002 Animal Bioscience Vol.15 No.5
The effects of recording interval (1, 2, 3, 4, 5, 10, 15, 20 and 30 min) on the estimation of some grazing behavior variables in beef cows and calves (<4 months old) were investigated in a daytime grazing (7 h) system utilizing a bahiagrass (Paspalum notatum Flugge) pasture (a 1.1 ha paddock and a 0.4 ha resting area). Recording intervals of 10-30 min tended to underestimate the time spent grazing and ruminating and overestimate the time spent resting by animals, whereas intervals of 1-5 min resulted in almost constant estimates. In all grazing activities, the errors of estimation became larger when the recording interval exceeded 5 min. The accuracy of estimation was higher for grazing time>rumination time>resting time. An increase in recording interval always decreased estimates of the distance walked by animals. It was concluded that recording intervals of 1-5 min provide reliable estimates of the time spent grazing, ruminating and resting. It was also concluded that positioning of animals at 1 min intervals may provide estimates of walking distance with acceptable bias toward underestimation.
Hirata Kourou,Iwanaga Kengo,Yamasaki Yuji,Takagi Ken-ichi 한국분말야금학회 2006 한국분말야금학회 학술대회논문집 Vol.2006 No.1
Injection molding of corrosive super engineering plastics and engineering plastics with various fillers is conducted under severe conditions and causes corrosion and wear problems. We have developed boride base cermets, which have excellent corrosion-and wear-resistances, and tried to apply them into plastic molding machine parts. In this paper, the effects of V substitution for Cr on the mechanical properties, corrosion resistance and microstructure of Ni-5.0B-51.0Mo-(17.5-X)Cr-XV (mass%) model cermets were investigated. Both transverse rupture strength (TRS) and hardness increased monotonically with increasing V content and reached 2.94GPa and at 10.0%V, respectively. The improvements of TRS and hardness were attributed to microstructural refinement.
Hirata, Yoshihiro,Shimonosono, Taro The Korean Ceramic Society 2016 한국세라믹학회지 Vol.53 No.1
This analyzed a Young's modulus (E), a thermal expansion coefficient (TEC, ${\beta}$) and a thermal conductivity (${\kappa}$) of the material with simple cubic particulate inclusion using two model structures: a parallel structure and a series structure of laminated layers. The derived ${\beta}$ equations were applied to calculate the ${\beta}$ value of the W-MgO system. The accuracy was higher for the series model structure than for the parallel model structure. Young's moduli ($E_c$) of sintered porous alumina compacts were theoretically related to the development of neck growth of grain boundary between sintered two particles and expressed as a function of porosity. The series structure model with cubic pores explained well the increased tendency of $E_c$ with neck growth rather than the parallel structure model. The thermal conductivity of the three phase system of alumina-mullite-pore was calculated by a theoretical equation developed in this research group, and compared with the experimental results. The pores in the sintered composite were treated as one phase. The measured thermal conductivity of the composite with 0.5-25% porosity (open and closed pores) was in accordance with the theoretical prediction based on the parallel structure model.
Vanishing skyrmion Hall effect at the angular momentum compensation temperature of a ferrimagnet
Hirata, Yuushou,Kim, Duck-Ho,Kim, Se Kwon,Lee, Dong-Kyu,Oh, Se-Hyeok,Kim, Dae-Yun,Nishimura, Tomoe,Okuno, Takaya,Futakawa, Yasuhiro,Yoshikawa, Hiroki,Tsukamoto, Arata,Tserkovnyak, Yaroslav,Shiota, Yoi Springer Science and Business Media LLC 2019 Nature nanotechnology Vol.14 No.3
Design of Low Power All-Optical Networks with Dynamic Lightpath Establishment
Hirata, Kouji,Ito, Kohei,Fukuchi, Yutaka,Muraguchi, Masahiro The Korea Institute of Information and Commucation 2016 Journal of communications and networks Vol.18 No.4
In multifiber all-optical networks, optical amplifiers are used for amplifying multiple optical signals with different wavelengths in fibers. An optical amplifier operates when any of lightpaths passes through it. Therefore, it should simultaneously amplify as many lightpaths as possible for efficiently utilizing its power. This paper proposes a dynamic lightpath establishment scheme considering the use efficiency of the optical amplifiers and the depletion of the wavelength resources in multifiber all-optical networks. The proposed scheme provides a routing and wavelength assignment strategy that reduces both the power consumption of the optical amplifiers and the blocking probability of the lightpath establishment. Through simulation experiments, we demonstrate the effectiveness of the proposed scheme.