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RISS 인기검색어
- 검색키워드
- 저자 : TAKAYOSHI NAKANO (검색결과 6 건)
- 무료
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FIELD ORIENTED CONTROL SYSTEM FOR INDUCTION MACHINE WITHOUT SPEED SENSOR
TAKAYOSHI NAKANO,KIYOAKI SASAGAWA,MAKOTO HASHII 전력전자학회 1989 ICPE(ISPE)논문집 Vol.- No.-
A variable speed drive system by the field oriented control method without a speed sensor is described. In this system, the speed actual value is estimated from the position of the flux vector calculated from the terminal voltage and current.<br/> The control system is apllied to a 165 kW induction motor drive and a GTO PWM inverter, and tested. The error of the speed control is within ± 0.5 % for a speed control range of 1 : 20. The indicial response of speed control is about 15 rad/sec.<br/> Also, subjects for future are described.<br/>
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Bioavailability of Iron-fortified Whey Protein Concentrate in Iron-deficient Rats
Nakano, Tomoki,Goto, Tomomi,Nakaji, Tarushige,Aoki, Takayoshi Asian Australasian Association of Animal Productio 2007 Animal Bioscience Vol.20 No.7
An iron-fortified whey protein concentrate (Fe-WPC) was prepared by addition of ferric chloride to concentrated whey. A large part of the iron in the Fe-WPC existed as complexes with proteins such as ${\beta}$-lactoglobulin. The bioavailability of iron from Fe-WPC was evaluated using iron-deficient rats, in comparison with heme iron. Rats were separated into a control group and an iron-deficiency group. Rats in the control group were given the standard diet containing ferrous sulfate as the source of iron throughout the experimental feeding period. Rats in the iron-deficiency group were made anemic by feeding on an Fe-deficient diet without any added iron for 3 wk. After the iron-deficiency period, the iron-deficiency group was separated into an Fe-WPC group and a heme iron group fed Fe-WPC and hemin as the sole source of iron, respectively. The hemoglobin content, iron content in liver, hemoglobin regeneration efficiency (HRE) and apparent iron absorption rate were examined when iron-deficient rats were fed either Fe-WPC or hemin as the sole source of iron for 20 d. Hemoglobin content was significantly higher in the rats fed the Fe-WPC diet than in rats fed the hemin diet. HRE in rats fed the Fe-WPC diet was significantly higher than in rats fed the hemin diet. The apparent iron absorption rate in rats fed the Fe-WPC diet tended to be higher than in rats fed the hemin diet (p = 0.054). The solubility of iron in the small intestine of rats at 2.5 h after ingestion of the Fe-WPC diet was approximately twice that of rats fed the hemin diet. These results indicated that the iron bioavailability of Fe-WPC was higher than that of hemin, which seemed due, in part, to the different iron solubility in the intestine.
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Classification and visualization of primary trabecular bone in lumbar vertebrae
Basaruddin, Khairul Salleh,Omori, Junya,Takano, Naoki,Nakano, Takayoshi Techno-Press 2014 Advances in biomechanics & applications Vol.1 No.2
The microarchitecture of trabecular bone plays a significant role in mechanical strength due to its load-bearing capability. However, the complexity of trabecular microarchitecture hinders the evaluation of its morphological characteristics. We therefore propose a new classification method based on static multiscale theory and dynamic finite element method (FEM) analysis to visualize a three-dimensional (3D) trabecular network for investigating the influence of trabecular microarchitecture on load-bearing capability. This method is applied to human vertebral trabecular bone images obtained by micro-computed tomography (micro-CT) through which primary trabecular bone is successfully visualized and extracted from a highly complicated microarchitecture. The morphological features were then analyzed by viewing the percolation of load pathways in the primary trabecular bone by using the stress wave propagation method analyzed under impact loading. We demonstrate that the present method is effective for describing the morphology of trabecular bone and has the potential for morphometric measurement applications.
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Peng Wang,Kousaku Souma,Tastunori Yano,Masayuki Nakano,Hideki Okamoto,Binghai Cao,Chihiro Sato,Takayoshi Masuko 한국초지조사료학회 2009 한국초지조사료학회 학술대회논문집 Vol.2009 No.08
The objective of this study was evaluated the influences of the nitrogen fertilization level on timothy silage fermentation quality, nutritive value, and nutrient intake. In both the first and second crops, high level nitrogen fertilization (H) led to a lower WSC content and higher CP content than standard nitrogen fertilization (S). The silage fermentation quality was good in the presence of a Lactobacillus inoculant (SI and HI) than uninoculant (SC and HC). In the first crop silage, the TDN content and intake were significantly higher (P<0.01) for HI than for SI. In the second silage, the DM, DE, and TDN intakes did not significantly differ among the 4 treatments.
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Sung‑Hyun Park,Ozkan Gokcekaya,Ryosuke Ozasa,Myung‑Hoon Oh,Young‑Won Kim,Hyoung Seop Kim,Takayoshi Nakano 대한금속·재료학회 2024 METALS AND MATERIALS International Vol.30 No.5
The microstructural evolution and crystallographic texture formation of β-solidifying Ti-44Al-6Nb-1.2Cr alloy were identifiedunder single- and multi-track exposures via laser powder bed fusion (L-PBF) for various process parameters. Undersingle-track exposure, the microstructure of the melt pool was divided into the band-like α2 phase in the melt pool boundaryand β phase in the melt pool center. Numerical and thermodynamic simulations revealed that the underlying mechanism ofphase separation was related to the variation in the cooling rate in the melt pool, whereas microsegregation induced a shiftin the solidification path. Meanwhile, the crystallographic texture of the α2 phase region was identical to that of the substrateowing to the epitaxial growth of the β phase and subsequent α phase nucleation. In contrast, the β phase exhibited a ± 45°inclined <100> alignment in the melt pool, which was tilted to align along the build direction toward the center of the meltpool corresponding to the simulated thermal gradient direction. Furthermore, the narrow hatch space condition maintainedthe crystallographic texture to the subsequent scan, forming a continuous band-like α2 phase with a strong selection. However,the crystallographic texture in a wide hatch space condition manifested a random distribution and constituted a finemixture of the β and α2 phases. For the first time, these results will offer an understanding of an anisotropic microstructurecontrol via the L-PBF process and ensure the tailoring of the mechanical properties in the β-solidifying γ-TiAl-based alloysby approaching hatch spacing control.
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Laser Powder Bed Fusion Additive Manufacturing of Recycled Zircaloy-4
Soung Yeoul Ahn,Sang Guk Jeong,Eun Seong Kim,Suk Hoon Kang,Jungho Choe,Joo Young Ryu,Dae Woon Choi,Jin Seok Lee,Jung‑Wook Cho,Takayoshi Nakano,Hyoung Seop Kim 대한금속·재료학회 2023 METALS AND MATERIALS International Vol.29 No.9
Interest in Zircaloy-4 scrap recycling has increased in recent years. Zircaloy-4’s high melting temperature and powder reactivitypose significant challenges for metal additive manufacturing (MAM). In this study, Zircaloy-4 parts were built usinglaser powder bed fusion MAM for the first time. The reactivity of the Zircaloy-4 powder was successfully suppressed duringthe entire manufacturing process. The mechanical properties of the printed Zircaloy-4 were evaluated at room temperatureand reactor operating temperature of 316 °C. Remarkable yield strengths at both temperatures were obtained. This studywill serve as a starting point for safe Zircaloy-4 additive manufacturing.
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