A study to investigate contact detection and recognition of the cutting state by means of the acoustic emission (AE) technique in ultra-precision turning is presented. Detection of accurate cutting-edge position was achieved through investigation of the contact limit between the cutting edge and workpiece through use of the AE technique. Moreover, to recognize the cutting state, changes in AE signals instigated by corresponding changes in the cutting condition were monitored. In the contact-detection experiment, contact between the cutting edge and workpiece was detected with a cut depth of 10 nm. Likewise, in the cutting state recognition experiment, AE signal waveforms were observed to demonstrate changes corresponding to changes in the cutting state. These results confirm the feasibility of using the AE technique in cutting state monitoring experiments.
Abstract-With the approach of the 2020 Tokyo Olympics and Paralympics, interest in sports for participants with disabilities has been steadily increasing. For Japan to be successful in the Paralympic sports, scientific and engineering support similar to that provided to other Olympic competitors is necessary. This study develops a multimodal strategy board to improve Japan's competitiveness in goalball, a team sport for visually impaired players. The proposed tool is composed of an image processing system that determines the ball's position and movement, and a strategy board that provides tactical information. This paper describes the method used to determine ball position from game video and the structure of a haptic device incorporated into the strategy board.Index Terms-Disability sports, goalball, image processing system, haptic device, multimodal strategy board.
The number of patients with chronic respiratory deficiency, such as Chronic Obstructive Pulmonary Disease or Sleep Apnea syndrome, is increasing. For patients with comparatively serious symptoms, the Non-invasive Positive Pressure Ventilation (NPPV) may be prescribed. However, pressure necrosis or anaclisis could affect treatment by occurring at the contact area of nasal mask. In response to this problem, the construction of a simulation environment can be applied. This personal simulation model was created based on these measurement results and the interpolation results using the Free-form-deformation technique. A fundamental numerical analysis was performed, and Von Mises stress distribution was shown when the NPPV nasal mask made contact with the face. It is shown that the maximum stress can be decreased by 19.4% compared with the cases of standard mask. In conclusion, by using this system, the shape of a nasal mask suitable for each patient can be determined.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.