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An AFM-based Edge Profile Measuring Instrument for Diamond Cutting Tools
Asai, Takemi,Motoki, Takenori,Gao, Wei,Ju, Bing-Feng,Kiyono, Satoshi Korean Society for Precision Engineering 2007 International Journal of Precision Engineering and Vol.8 No.2
This paper describes an atomic force microscope (AFM)-based instrument for measuring the nanoscale cutting edge profiles of diamond cutting tools. The instrument consists of a combined AFM unit and an optical sensor to align the AFM tip with the top of the diamond cutting tool edge over a submicron range. In the optical sensor, a aser beam is emitted from a laser diode along the Y-axis and focused to a small beam spot with a diameter of approximately $10{\mu}m$ at the beam waist, which is then received by a photodiode. The top of the tool edge is first brought into the center of the beam waist by adjusting it in the X-Z-plane while monitoring the variation in the photodiode output. The cutting tool is then withdrawn and its top edge position at the beam center is recorded. The AFM tip can also be positioned at the beam center in a similar manner to align it with the top of the cutting edge. To reduce electronic noise interference on the photodiode output and thereby enhance the alignment accuracy, a technique is applied that can modulate the photodiode output to an AC signal by driving the laser diode with a sinusoidal current. Alignment experiments and edge profile measurements of a diamond cutting tool were carried out to verify the performance of the proposed system.
An AFM-based Edge Profile Measuring Instrument for Diamond Cutting Tools
Takemi Asai,Takenori Motoki,Wei Gao,Bing-Feng Ju,Satoshi kiyono 한국정밀공학회 2007 International Journal of Precision Engineering and Vol.8 No.2
This paper describes an atomic force microscope (AFM)-based instrument for measuring the nanoscale cutting edge profiles of diamond cutting tools. The instrument consists of a combined AFM unit and an optical sensor to align the AFM lip with the top of the diamond cut ling tool edge over a submicron range. In the optical sensor, a laser beam is emitted from a laser diode along the Y-axis and focused to a small beam spot with a diameter of approximately 10 ㎛ at the beam waist. which is then received by a photodiode. The top of the tool edge is first brought into the center of the beam waist by adjusting it in the X-Z-plane while monitoring the variation in the photodiode output. The cutting tool is then withdrawn and its top edge position at the beam center is recorded. The AFM tip can also be positioned at the beam center in a similar manner to align it with the top of the cutting edge. To reduce electronic noise interference on the photodiode output and thereby enhance the alignment accuracy, a technique is applied that can modulate the photodiode output to an AC signal by driving the laser diode with a sinusoidal current. Alignment experiments and edge profile measurements of a diamond cutting tool were carried out to verify the performance of the proposed system.
Self-Tuning Control of a Two-Link Flexible Manipulator using Neural Networks
Minoru Sasaki,Akihiro Asai,Toshimi Shimizu,Satoshi Ito(편집자) 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
In this paper, a self-tuning control of a two-link flexible manipulator using neural networks is presented. The neural networks learn the gains of PI controllers for the flexible manipulator. Numerical results show that this presented neural network control system can suppress the vibration of the flexible manipulator and track the desired joint angles.Simulation results show that the self-tuning control system using neural network can be used effectively for the position control of the two-link flexible manipulator.
Tomoo Nakagawa,Taku Kobayashi,Kiyohiro Nishikawa,Fumika Yamada,Satoshi Asai,Yukinori Sameshima,Yasuo Suzuki,Mamoru Watanabe,Toshifumi Hibi 대한장연구학회 2019 Intestinal Research Vol.17 No.4
Background/Aims: An interim analysis of post-marketing surveillance of CT-P13, an infliximab biosimilar, was performed to evaluate its safety and efficacy in Japanese patients with inflammatory bowel disease. Methods: Patients were prospectively enrolled between November 2014 and March 2017, after the launch of CT-P13 in Japan, and case report forms of patients followed for at least 4 months were analyzed as of July 2018. Results: Of 523 patients in the analysis set, 372 remained on CT-P13 therapy, while 54 (20.2%) of 267 patients with Crohn’s disease, and 97 (37.9%) of 256 patients with ulcerative colitis were withdrawn during follow-up. A total of 144 adverse drug reactions (ADRs) were reported in 106 patients (20.3%). Infusion reaction was the most frequent ADR observed in 49 patients (9.4%). Efficacy parameters decreased immediately after the start of treatment in naïve patients to anti-tumor necrosis factor-α antibody. In the patients switched from originator infliximab for nonmedical reasons, the decreased parameters due to proceeded treatment with the originator were maintained in low ranges, and the treatment continuation rate was high with low ADR incidence. In contrast, in patients switched for medical reasons such as adverse event or loss of response, the incidence of ADRs was high. However, the efficacy parameters were improved, and the treatment continuation rate was not significantly different from that of the naïve patient group. Conclusions: In this interim analysis, CT-P13 was comparable to the originator infliximab with respect to ADRs and efficacy, and is therefore considered to be a cost-efficient interchangeable biosimilar for Japanese patients with inflammatory bowel disease.