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In this paper, we proposed the regression model which could estimate unspecified people's systolic blood pressure (SBP) conveniently and continuously and checked its accuracy through clinical experiments. The method for estimating each individual SBP by using only pulse transit time (PTT) has been studied, but it is difficult to estimate unspecified people's SBP with the method using only PTT. Thus we researched several physical characteristic parameters which might affect blood pressure (BP) with the standard that we can measure them easily and conveniently, chose valid physical characteristic parameters through a clinical testing and correlation analysis, and made the regression model using PTT and valid physical characteristic parameters for estimating unspecified people's SBP. Comparing the result of the proposed method with American National Standards Institute of the Association of the Advancement of Medical Instrument (ANSI/AAMI), we know that the proposed regression model gives an acceptable result.

Résumé -Comparaison des effets de la pression ambiante sur l'atomisation en "spray" de methylester d'huile de soja et de dimethyléther -Le but de cette étude est l'investigation expérimentale de l'effet de diverses pressions ambiantes sur les caractéristiques des sprays (issus d'un système "common rail") de methylester d'huile de soja (SME) et de dimethyléther (DME). La pression ambiante dépend de la chambre et sa valeur la plus haute peut monter jusqu'à 4 MPa. Pour comparer le développement de spray et la caractéristique d'atomisation, des images de spray de SME et DME à différentes pression ambiantes sont obtenues avec une caméra à haute vitesse à deux lampes de métal halide. Les caractéristiques du spray, comme la pénétration, la distance radiale maximale et le diamètre de spray, sont mesurées et analysées. De plus, le diamètre de Sauter (SMD) des deux carburants à différentes pressions est mesuré. On a constaté que, dans les mêmes conditions, la distance de pénétration du spray de SME est supérieure à celle du spray de DME. La pénétration axiale, la distance radiale maximale et le diamètre du spray décroissent quand la pression ambiante croît. Quand la pression ambiante croît, le SMD décroît et le spray de DME montre plus d'atomisation que celui de SME. Abstract -A Comparison of Effects of Ambient Pressure on the Atomization Performance of Soybean Oil Methyl Ester and Dimethyl Ether Sprays -The purpose of this study is the experimental investigation of Soybean oil Methyl Ester (SME) and DiMethyl Ether (DME) spray characteristics injected through the common-rail injection system under various ambient pressures. A high pressure chamber that can be pressurized up to 4 MPa was utilized for a change of ambient pressure. In order tocompare the spray development and atomization characteristics, the images of SME and DME were obtained by using a high speed camera with two metal halide lamps under various ambient pressures in the spray chamber. From these spray images, the spray characteristics such as the spray penetration from the nozzle tip, maximum radial distance, and spray diameter were measured and analyzed. In addition, the Sauter Mean Diameter (SMD) of two fuels under ambient pressure was analyzed using the droplet measuring system. It was revealed that the axial distance of spray from the nozzle tip of the SME spray is longer than that of DME spray under same injection condition. The axial penetration, maximum radial distance, and spray diameter decreased when the ambient pressure in the chamber increased. As the ambient pressure increased, the SMD decreased and the DME spray showed a superior atomization performance compared to the SME spray.