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351 results on '"Warisawa, Shin'ichi"'

153. Pin-on-plate test method for evaluation of the life of an artificial joint

Author

sawano, hiroshi, Warisawa, Shin'ichi, and Ishihara, Sunao

Subjects
耐用年数, life, pin-on-plate test, wear, 超高分子量ポリエチレン, ピンオンプレート摺動試験, UHMWPE, 摩耗, Artificial Joint, 人工関節
Abstract

The sliding test with an artificial joint simulator is applied for evaluation of the life of an artificial joint. However, an artificial joint simulator is very expensive and easier sliding test method for evaluation of the life of an artificial joint is required. A pin-on-plate test method with 1 axis and a pin-on-plate test method are easy, but insufficient to evaluate the life of an artificial joint. Then, in this work, 2 axes pin-on-plate method is proposed for evaluation of the life of an artificial joint.

Published
2008

154. 人工関節の耐摩耗性を向上させるためのMPC高分子のグラフト重合

Author

sawano, hiroshi, Warisawa, Shin'ichi, and Ishihara, Sunao

Subjects
グラフト重合, surgical procedures, operative, 接触角, MPC, 超高分子量ポリエチレン, UVランプ, immune system diseases, Ultra High Molecular Polyethylene, Ultraviolet Lamp, Artificial Joint, Contact Angle, 人工関節, Graft Polymerization
Abstract

In order to investigate the mechanism of low wear of the UHMWPE (ultra high molecular weight poly ethylene) implant grafted by MPC (2-methacryloyloxyethyl phosphorylcholine) polymer, the experiment was conducted. In the experiment, MPC polymer was grafted to an UHMWPE plate by using a 100 W high pressure mercury lamp. The contact angle analysis and XPS (X-ray photoelectron spectroscopy) analysis before grafting and after grafting on the UHMWPE plate was conducted.

Published
2007

162. Improvement in Roundness of the Femoral Head of an Artificial Hip Joint by Means of Abrasive Waterjet

Author

sawano, hiroshi, Warisawa, Shin'ichi, Mitsuishi, Mamoru, and Kuramoto, Kouichi

Subjects
アブレシブウォータージェット, ultra-precision finishing, 人工股関節, 超精密仕上げ, 骨頭, artificial hip joint, femoral head, 真円度, roundness, abrasive waterjet
Abstract

In order to extend the life of an artificial hip joint, it is necessary to reduce the amount of UHMWPE cup wear. One of remedies to reduce the wear is to improve surface roughness and roundness of the femoral head. Its surface roughness was successfully improved by ultra-precision finishing by means of abrasive in the previous paper. Furthermore, in order to improve roundness of femoral head, a machining model of the proposed method was developed. In this paper, to improve roundness of a femoral head, a nozzle feed speed planning method is proposed. The feed speed planning can be conducted by feed-forward calculation of machining amount according to the machining model. Nozzle feed speed control experiments showed effective improvement of the roundness, and thus the machining model and feed speed control method were verified to be feasible in practical use.

Published
2004

163. Analysis of Removal Amount in Ultra-precision Finishing for the Femoral Head of the Artificial Hip Joint by Means of Abrasive Waterjet

Author

sawano, hiroshi, Warisawa, Shin'ichi, Mitsuishi, Mamoru, and Kuramoto, Kouichi

Subjects
アブレシブウォータージェット, ultra-precision finishing, 人工股関節, 加工量, 超精密仕上げ, 骨頭, artificial hip joint, removal amount, femoral head, abrasive waterjet
Abstract

In order to extend the life of an artificial hip joint, it is necessary to reduce the amount of UHMWPE cup wear. One of remedies to reduce the wear is to improve its surface roughness and roundness. In the last paper, ultra-precision finishing by means of abrasive waterjet was proposed. Its surface roughness was successfully improved by the method, however, its roundness got worse. In the paper, then, a machining model of the proposed method is developed. The model takes into consideration the machining ability distribution within a jet and effects of stand-off distance and abrasive density upon the machining ability. The machining error of experiments and simulations based on the proposed model in changing the abrasive density has good correspondence qualitatively.

Published
2004

169. Data model for health telemonitoring and persuasive system design

Author

Maret, Pierre, Pawar, Pravin Amrut, Warisawa, Shin'ichi, Muhlenbach, Fabrice, Lopez, Guillaume, and Yamada, Ichiro

Abstract

The health telemonitoring systems are expected to accomplish two basic tasks: continuously collect data from data sources wherever they may be; and allow remote communication between the stakeholders to access data. This data is further used by decision making systems to infer a patient's condition and possibly to motivate a patient to follow a healthy lifestyle by using persuasive system approach. The implementation and maintenance of such systems require specific attention of software engineers for data management because of the complexity involved in the management of various data sources and privacy-related issues of personal data. In this paper, we propose a data model that is generic enough to describe and to support many kinds of telemonitoring applications. These applications include data mining applications which analyse and combine sensor data for a decision making, and persuasive systems which motivate a patient to follow a healthy lifestyle. We show that our data model is useful for a smooth management of data mining outputs and that it avoids the integration efforts in dealing with heterogeneous storage mechanisms. We also show that our data model eases the management of the granularity of data and that it facilitates software designers' tasks for the implementation of privacy protection mechanisms.

Published
2017
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183. Wearable Eating Habit Sensing System Using Internal Body Sound

Author

SHUZO, Masaki, primary, KOMORI, Shintaro, additional, TAKASHIMA, Tomoko, additional, LOPEZ, Guillaume, additional, TATSUTA, Seiji, additional, YANAGIMOTO, Shintaro, additional, WARISAWA, Shin'ichi, additional, DELAUNAY, Jean-Jacques, additional, and YAMADA, Ichiro, additional

Published
2010
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