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固体音の予測手法として縦波と横波, 及び二種類の減衰項を考慮したFDTD法が提案されている.この手法では平均媒質定数を用いることで, 固体流体を問わず, 媒質の粘弾性挙動をただひと組の運動方程式と構成方程式で表現し, リープフロッグアルゴリズムを用いてそれらの式を離散化する.離散化されたすべての参照点で逐次計算を行うため, 過渡応答を直接的に求めることができ, 目や耳に訴える直感的な予測結果を得るのに有効であると思われる.本報では不等間隔グリッドを用いた直交異方性不均質媒体解析のための定式化といくつかの数値計算例を紹介する., The finite-difference time-domain method considering longitudinal and shear waves and two types of damping terms has been proposed as a prediction method for structure-borne sound. In the method, both solids and fluids are assumed to be governed by a unique set of motion equations and viscoelastic constitutive equations using averaged material parameters. These equations are discretized with a difference scheme of the leap-flog algorithm. The method seems to be especially effective for providing both visible and audible predictions because time responses can be obtained directly. Herein the formulation for heterogeneous orthotropic media with irregular grid systems and some numerical examples are introduced., 本文データは学協会の許諾に基づきCiNiiから複製したものである

We tried horticultural therapy on the users of the Aged People day-care facility once a week for three months. As a new approach of assessment, we used the original assessment sheet (Awaji horticultural therapy assessment sheet : AHTAS) and examined the practical utility of AHTAS and the relation between AHTAS and the existing measures for evaluation ; QOL-D, MMSE, Vitality Index etc. AHTAS contains 10 questions. Items include 6 questions on mental issues, 3 questions on motivation issues and the remaining question on the issue of communication. All things considered AHTAS assesses the quality of life. After three months horticultural therapy we analyzed the data and recognized that the reliability and the ease of use of AHTAS resulted in a strong correlation between AHTAS and existing measures for evaluation. Our new horticultural therapy assessment method for the elderly using AHTAS and the existing measures for evaluation could give an objective assessment of horticultural therapy for the elderly that are experiencing problems with their quality of life, mental function, motivation and their communication ability. This study has also indicated that the use of only AHTAS could still assess motivation, mental function, communication faculty and the quality of life.