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  • Fukashi Andoh
  • 2008
This paper presents a novel approach to the inertia identification problem of mechatronic servo systems with limited strokes. In the proposed approach, the product of the integral of torque reference input and motor speed of mechatronic servo system in periodic motion is calculated. Then its time average over one period is used to calculate inertia. The(More)
In an effort to evaluate flow characteristics of the saphenous vein grafts (SVG) after coronary artery bypass grafting, we performed duplex scanning of SVG which were anastomosed to the left anterior descending artery in 12 patients, and compared those indexes with 34 internal thoracic artery grafts (ITAG). The SVG were observed with a 7.5 MHz duplex(More)
  • Fukashi Andoh
  • 2008
In this article, a novel approach to the Coulomb friction identification problem of mechatronic servo systems with limited strokes is presented. The proposed approach utilizes two sinusoidal position reference inputs having the same amplitude to frequency ratio, and the first order time integral of torque reference inputs over multiple time intervals of the(More)
  • Fukashi Andoh
  • 2007
An algorithm to identify the inertia of mechatronic servo systems with infinitesimal motions is proposed. The proposed algorithm utilizes a position control with sinusoidal position reference input, and identifies total inertia of the motor and a mechanical load attached to the motor based on the amplitude of motor position at steady state. The proposed(More)
Doppler echocardiography has several advantages such as frequent use, noninvasive approach, and physiological evaluation. Supine bicycle exercise testing was conducted for 30 patients undergoing CABG with LITA to LAD. Doppler echocardiography studies were performed before and after exercise to observe the change. On the basis of the angiographic data,(More)
For the past 25 years we have performed 61 reoperations in 58 patients with congenital heart disease who previously underwent total correction for the diagnosed ventricular septal defect, tetralogy of Fallot, atrioventricular septal defect, atrial septal defect, total anomalous pulmonary venous connection (TAPVC), and other involvement for 27, 11, 5, 4, 4,(More)
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