P ロ rpose ： In order to obtain relevant information for optimizing the performance of air mat ・ tresses for elderly individuals ， the study was designed to ， 1)Establish the relat 童 onship between the internal air pressure of the mattress and interface pressure wh 童 le the subjects were at different positions ． 2)To see whether healthy young individuals could serve as valld controls for this kind of evaluation ． Subjects ； The sublects co 蝨 sisted of 8 elderly bed ・ bOund individuals withah 量 story of pressure ulcer and 8 healthy females agod 20 years ． The interface pressure was measured by a con − tact pressure distribution measurement device mads by NEC ・ Sanei Co ． with subjects in either asupine or lateral recumbent position and the head of the Gatch − bed raised to 30 ， 450r 70 degrees． The maximum interface pressure at the internal pressure setting of l80r 36 mmHg was compared to the known pressure level associated with ulcer formation ， This was performed while the subject was lying ln a range of different positions ． The cellular type aiternating Pressure mattress was used in the study ． Res 腿 蓋 ts l 1 ) When the Gatch − bed was set at any ang 】 e reductlon of internal air pressure effectively achieved more uniform pressure distribution at the tissue interface for the elderly ， although Gatch − bed ang 】 es with a head elevation greater than 45 degrees were associated with the

Greenhouses in Japan are usually made of steel pipes and plastic films. A greenhouse comprises arch and straight pipes. The structure is simple, and the construction cost is reasonable. However, typhoons and other disasters have caused considerable damage involving collapse of many structures, including greenhouses. This was caused by the lack of structural strength because of its simplicity. Snows and storms have only brought minor damages in the Nara prefecture until recent years. However, the number of incidents causing damage has been increasing because of the abnormal weather. Therefore, the farmers in the Nara prefecture need strong greenhouses. The basic greenhouse model is the two-dimensional structure of the arch pipe. Some studies conducted stress analysis on this two-dimensional structure. It has been observed that almost all greenhouses have undergone a three-dimensional collapse. This research proposes a new trussbased structure; structural design was conducted using a three-dimensional model. We focused on the rigidity and attempted to analyse the eigenvalues for both the new structure and the conventional one. Consequently, the number of eigenmodes in the new structure was found to be less than the number of those in the conventional one between 0 Hz and 10 Hz. We consider that the numbers of eigenmodes were transferred to a higher frequency range. The new structure showed good resistance to collapse by resonance.