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Atsushi KOBAYASHI,Toshiki HIROGAKI,Eiichi AOYAMA 제어로봇시스템학회 2020 제어로봇시스템학회 국제학술대회 논문집 Vol.2020 No.10
In recent years, electronic devices have become lighter, thinner, shorter, smaller, and more multifunctional, leading micro drilling technology to become more sophisticated. In order to meet these demands on electronics, this paper proposes a drilling machine tool with a counterbalance vibration control mechanism. A finite element analysis model of the machine tool is created and analysis results are compared with vibration measurement experiment results. Finally, the vibration characteristics of the resulting machine tool equipped with a vibration damping mechanism are examined. Model validity was confirmed by comparing analytic and experimental results. Results show that mounting this mechanism on a drilling machine tool reduces vibration, improves hole position accuracy, and reduces wear and chipping of the drill tip surface.
Ryotaro Yonemoto,Toshiki Hirogaki,Eiichi Aoyama 제어로봇시스템학회 2020 제어로봇시스템학회 국제학술대회 논문집 Vol.2020 No.10
This study investigates an improved method for super finishing of a die surface by means of a robot that holds fixed abrasive grains. A low-pressure grinding method was previously investigated to exploit the characteristics of the fine grinding stone by means of a voice coil motor (VCM). However, the VCM proved disadvantageous in that the grinding pressure changed when the height of the grinding surface was changed or the volume of the grinding stone was reduced. To solve this problem, a feedback control mechanism of the force was employed in this study, such that a constant pressure could be achieved for long periods of polishing. It was found that this allowed for the stable execution of long-term polishing, along with the previously set low pressure being maintained simultaneously with high accuracy. In addition, increased improvement of surface roughness was also achieved because polishing can be carried out at high pressures for a long period of time without any decrease in pressure occurring.
Ryuji Nagata,Shun Sato,Aldrine Kilua,Naoki Fukuma,Yasunori Nakayama,Eiichi Kitazono,Toshiaki Aoyama,Kyu Ho Han,Michihiro Fukushima 한국식품과학회 2021 Food Science and Biotechnology Vol.30 No.11
BARLEYmax, a barley variety, and cocoapolyphenols (CPPs) have been reported to affect bacterialmetabolites in the colon. This study aimed to evaluate thecombined effects of BARLEYmax and CPPs supplementationon fecal microbiota in vitro using pig feces for 48 h. The relative abundances of the family Clostridiaceae andthe genus Clostridium and ammonia–nitrogen productionwere decreased by both BARLEYmax and CPP supplementation,and there was a positive correlation betweentheir abundances and the ammonia–nitrogen concentration. Although acetate and n-butyrate production was decreasedby CPP supplementation, their concentrations were maintainedat a higher level in the BARLEYmax ? CPP groupthan in the cellulose (control) and cellulose ? CPP groups. Therefore, this study demonstrated that a combination ofBARLEYmax and CPPs may be beneficial in maintaininghigher short-chain fatty acid production and the eliminationof potentially harmful factors.