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RISS 인기검색어
- 검색키워드
- 저자 : Yusuke Yasuda (검색결과 3 건)
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PID Gain Tuning for Disturbance Attenuation Using FRIT Method
Yusuke Yasuda,Shiro Masuda,Manabu Kano 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
Fictitious reference iterative tuning (FRIT) is a method for designing the feedback controller of an unknown plant model by optimizing the performance index that consists of the fictitious reference output computed from one-shot experimental input-output data. This paper proposes a PID gain tuning for disturbance attenuation using FRIT method. While the conventional FRIT tunes the PID gains so that the plant output follows the reference model output, the proposed one tunes the PID gains so that the disturbance response follows the reference model output. The proposed approach has the advantage that it more directly tunes the PID gains for the disturbance attenuation than the conventional ones. The efficiency of the proposed method is shown through a numerical example.
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Yusuke Uchinami(Yusuke Uchinami ),Koichi Yasuda(Koichi Yasuda ),Hideki Minatogawa(Hideki Minatogawa ),Yasuhiro Dekura(Yasuhiro Dekura ),Noboru Nishikawa(Noboru Nishikawa ),Rumiko Kinoshita(Rumiko Kino 대한방사선종양학회 2024 Radiation Oncology Journal Vol.42 No.1
Purpose: To investigate the clinical significance of adaptive radiotherapy (ART) in locally advanced nasopharyngeal carcinoma treated with intensity-modulated radiotherapy (IMRT). Materials and Methods: Eligible patients were treated with concurrent chemoradiotherapy using IMRT. Planning computed tomography in ART was performed during radiotherapy, and replanning was performed. Since ART was started in May 2011 (ART group), patients who were treated without ART up to April 2011 (non-ART group) were used as the historical control. The Kaplan-Meier method was used to calculate overall survival (OS), locoregional recurrence-free survival (LRFS), progression-free survival (PFS), and distant metastasis-free survival (DMFS). LRFS for the primary tumor (LRFS_P) and regional lymph node (LRFS_LN) were also studied for more detailed analysis. Statistical significance was evaluated using the log-rank test for survival. Results: The ART group tended to have higher radiation doses. The median follow-up period was 127 months (range, 10 to 211 months) in the non-ART group and 61.5 months (range, 5 to 129 months) in the ART group. Compared to the non-ART group, the ART group showed significantly higher 5-year PFS (53.8% vs. 81.3%, p = 0.015) and LRFS (61.2% vs. 85.3%, p = 0.024), but not OS (80.7% vs. 80.8%, p = 0.941) and DMFS (84.6% vs. 92.7%, p = 0.255). Five-year LRFS_P was higher in the ART group (61.3% vs. 90.6%, p = 0.005), but LRFS_LN did not show a significant difference (91.9% vs. 96.2%, p = 0.541). Conclusion: Although there were differences in the patient backgrounds between the two groups, this study suggests the potential effectiveness of ART in improving locoregional control, especially in the primary tumor.
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Synthesis of metallic copper nanoparticles and metal-metal bonding process using them
Kobayashi, Yoshio,Nakazawa, Hiroaki,Maeda, Takafumi,Yasuda, Yusuke,Morita, Toshiaki Techno-Press 2017 Advances in nano research Vol.5 No.4
Metallic copper nanoparticles were synthesised by reduction of copper ions in aqueous solution, and metal-metal bonding by using the nanoparticles was studied. A colloid solution of metallic copper nanoparticles was prepared by mixing an aqueous solution of $CuCl_2$ (0.01 M) and an aqueous solution of hydrazine (reductant) (0.2-1.0 M) in the presence of 0.0005 M of citric acid and 0.005 M of n-hexadecyltrimethylammonium bromide (stabilizers) at reduction temperature of $30-80^{\circ}C$. Copper-particle size varied (in the range of ca. 80-165 nm) with varying hydrazine concentration and reduction temperature. These dependences of particle size are explained by changes in number of metallic-copper-particle nuclei (determined by reduction rate) and changes in collision frequency of particles (based on movement of particles in accordance with temperature). The main component in the nanoparticles is metallic copper, and the metallic-copper particles are polycrystalline. Metallic-copper discs were successfully bonded by annealing at $400^{\circ}C$ and pressure of 1.2 MPa for 5 min in hydrogen gas with the help of the metalli-ccopper particles. Shear strength of the bonded copper discs was then measured. Dependences of shear strength on hydrazine concentration and reduction temperature were explained in terms of progress state of reduction, amount of impurity and particle size. Highest shear strength of 40.0 MPa was recorded for a colloid solution prepared at hydrazine concentration of 0.8 M and reduction temperature of $50^{\circ}C$.
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