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Naoto Sakamoto,Akio Tsuneda 대한전자공학회 2009 ITC-CSCC :International Technical Conference on Ci Vol.2009 No.7
Initial phase dependence of aperiodic auto-/cross-correlation functions of orthogonal sequences generated by NFSRs is discussed. We investigate side-lobe magnitude of auto-correlation functions and distributions of maximum cross-correlation values. Some dependence on initial phases is revealed.
International Knowledge Flows and Productivity: Intra- vs. Inter-Industry Spillovers
Naoto Jinji,Xingyuan Zhang 한국국제경제학회 2015 International Economic Journal Vol.29 No.3
The effects of international knowledge spillovers on total factor productivity (TFP) at the industry level are examined by using a panel of 13 manufacturing industries across 15 OECD countries over 23 years. We distinguish between intra- and inter-industry spillovers from the information on patent applications and citations. Patent data are taken from the Japan Patent Office and the United States Patent and Trademark Office. Using four alternative spatial panel estimation techniques, we find that international knowledge spillovers within the same industry significantly contribute to sectoral TFP. In contrast, there is little evidence of a positive effect of international knowledge spillovers on TFP across industries.
Naoto Kurihara,Kunhua Fan,Howard T. Thaler,Kan Yang,Martin Lipkin 한국식품영양과학회 2008 Journal of medicinal food Vol.11 No.2
We previously reported hyperproliferation and hyperplasia in C57Bl/6 mouse mammary gland after feeding aWestern-style diet (WD); these findings decreased after supplementing WD with increased calcium and vitamin D3. We nowagain fortified WD with increased calcium and vitamin D3 from two sources: (1) a food source, calcium- and vitamin D3-en-riched yogurt (WDy diet) or (2) adding calcium and vitamin D3 directly to WD (WDCaD diet). After 6 months of feeding thenumber of mammary ducts was higher in mice consuming WD compared to WDy (216.0 vs. 202.7, P. .05) and WDCaD(216.0 vs. 194.9, P. .001). The percentage of small ducts increased in WD compared to AIN-76A controls (23.3% vs. 17.4%)but was lower in the WDy (17.1%) and WDCaD (14.8%) groups. WD mice had higher numbers of epithelial cells per ductthan WDy (33.2 vs. 27.4, P. .001) and WDCaD (33.2 vs. 27.8, P. .001) mice, and AIN-76A-fed mice had higher numbersthan WDy (31.1 vs. 27.4, P. .005) or WDCaD (31.1 vs. 27.8, P. .01) mice. Mitotic index was higher in WD than in WDCaD mice (0.0020 vs. 0.0009, P. .001). Thus, small mammary gland ductules and mitosis increased after feeding WDand decreased after supplementing the diets with increased calcium and vitamin D3, administered either in a dairy food (yo-gurt) or directly as calcium carbonate plus vitamin D3 in WD, suggesting further study of these nutrients for their possiblerelationship to breast cancer prevention.
New Collision Force Suppression Mechanism and Base Control of Human-Friendly Robot
Naoto Tanaka,Takayuki Iwama,Shunsuke Kumagai,Atsuo Takanishi,Hun-ok Lim 제어로봇시스템학회 2018 제어로봇시스템학회 국제학술대회 논문집 Vol.2018 No.10
This paper describes a human-friendly robot capable of securing human safety in human-robot collisions. The upper body of the robot has 11 DOFs, including 3 DOFs in the waist, 2 DOFs in each shoulder, 1 DOF in each elbow and 1 DOF in each hand. The upper body is mounted on the base with four omnidirectional wheels. A new light-weight collision force suppression mechanism that is able to operate with very little backlash was developed and was installed at the elbow of the human-friendly robot. The suppression mechanism consists a drum, a clutch gear, two release air bag, two stopper linings, and four compression springs. Also, a base control method to secure human safety is discussed. Through collision experiments, the effectiveness of the collision force suppression mechanism and control method is verified.
Change in type of heavy metal compounds after oxygen exposure of fly ash
( Naoto Kakinoki ),( Shinya Suzuki ),( Ayako Tachifuji ) 한국폐기물자원순환학회(구 한국폐기물학회) 2019 한국폐기물자원순환학회 심포지움 Vol.2019 No.1
Under the revision of the Waste Management and Public Cleansing Law in 1991, it was regulated that the fly ash must be landfilled after chelate treatment or cement solidification for preventing from the heavy metal leaching. However, it was reported that Pb eluted again from such treated fly ash if it was left for a certain period under the wet and oxidative condition. Therefore, the O<sub>2</sub> exposure experiment was conducted to clarify the re-elution mechanism under such condition. As the results, the Pb concentration in the elution of leaching test increased after O<sub>2</sub> exposure (Fig. 2). It suggests that the chelate bond is cleaved or the insoluble Pb compounds (PbO<sub>2</sub>) change to the water soluble compounds (PbO, PbCl<sub>2</sub>) by H<sub>2</sub> generated by the alkali hydration reaction with Al. Whereas the concentration of soluble Zn, which is amphoteric metal same as Pb, was decreased. From these results, it was considered that Zn was related to such chemical change of Pb. In this study, the change in the Zn compounds of fly ash after O<sub>2</sub> exposure was investigated to clarify the influence of O<sub>2</sub> on the change of insoluble metal compounds to soluble one. In all three experiments, the content of soluble Zn compounds and Zn oxide decreased as that of organic Zn and Zn sulfide increased (Fig. 2). It means that the soluble Zn reacted with hydrogen sulfur produced by H<sub>2</sub> and formed the insoluble ZnS under alkaline conditions. Such mechanism is also expected from the slight decrease in the concentration of the SO<sub>4</sub> <sup>2- </sup>after the O<sub>2</sub> exposure. From these results, it is estimated that O<sub>2</sub> contribute to the change in the charge of metal compounds and consequently is increased the soluble metal compounds.
Structural and Magnetic Properties of Antiferromagnetic Heusler Ru2MnGe Epitaxial Thin Films
Naoto Fukatani,Hirohito Fujita,Tetsuya Miyawaki,Kenji Ueda,Hidefumi Asano 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.63 No.3
Structural and magnetic properties were investigated for Heusler-type alloy Ru2MnGe thin films. Ru2MnGe films on MgO substrate were subjected to an in-plane compressive strain, and exhibitedenhanced antiferromagnetic (AFM) transition temperature (TN) up to 353 K, which exceeds by 37K from the cubic bulk material (TN = 316 K). We also observed the exchange coupling betweenRu2MnGe and Heusler-type ferromagnetic (FM) half-metal Fe2CrSi thin films. The present AFMHeusler alloy with relatively high TN is useful to fabricate high-quality all Heusler-type half-metalAFM/FM junctions and is a promising material for the emerging field of AFM spintronics.
Parameter dependence of nickel oxide nanoparticles prepared by pulsed-laserablation
Naoto Koshizaki,Takeshi Sasaki,Leszek Zbroniec 한양대학교 세라믹연구소 2005 Journal of Ceramic Processing Research Vol.6 No.2
Nickel oxide nanoparticles were fabricated by a laser ablation technique using the third harmonic of an Nd:YAG laser and sintered NiO targets in an on-axis configuration under argon pressures of 0.67, 1.33, and 2.00 Pa. The effects of the number of irradiating laser pulses, gas pressure, and target-to-substrate (T-S) distance on the average particle size, size distribution, and particle areal density were investigated. The nanoparticles obtained were always crystalline and 2 to 6 nm in diameter, irrespective of the preparation conditions as determined by high-resolution transmission electron microscopic (HRTEM) analysis. The average particle size increased with the number of laser pulses, indicating the particle growth on the substrate. The particle areal density was strongly affected by the target-to-substrate distance. The formation process of the nanoparticles is also discussed.