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Background There exists a growing need for a cost-effective, reliable, and portable pulsation simulator that can generate a wide variety of pulses depending on age and cardiovascular disease. For constructing compact pulsation simulator, this study proposes to use a pneumatic actuator based on cam-follower mechanism controlled by a DC motor. The simulator is intended to generate pulse waveforms for...
In order to calibrate a built-in vacuum sensor installed in a gas pressure balance such as the PG7601 (Fluke, USA), the sensor should be detached from the platform, which is a laborious and time-consuming task. It is clear that the best way to calibrate such a vacuum sensor installed in a gas pressure balance is to calibrate it directly in the current position without disassembly. For this purpose,...
The capacitance diaphragm gauge (CDG) is one of the most accurate transfer standards for use in atmospheric to medium vacuum regions. Currently, it is practical to cover a wide range of measurements with the least amount of equipment possible. In this study, one CDG with a metal membrane and two CDGs with a ceramic membrane are characterized through calibrations using a reference standard, in this...
The importance of measuring and simulating a radial pulsation is steadily increased in medical science area, because the radial pulsation is a surrogate maker to estimate a central aortic pressure waveform which is clinically imperative for predicting cardiovascular diseases. Due to technical limits, mathematical relationship between the central and radial pressures has not been reliably demonstrated...
This paper discusses an extended usage of conventional pressure balances for measurements of pressure down to a few Pa. Generally pressure balances are widely used as pressure standards but they have a major disadvantage, that is, their inability to operate at pressures below a limit determined by the mass of floating elements. This limit is typically around 5 kPa. Several approaches have been tried...
The skin is an indispensible organ for human because it contributes to the metabolism using its own biochemical functions as well as it protects the human body from the exterior stimuli. Recently, the friction coefficient have been used as the decision index of the progress for the bacterial aliments in the field of the skin physiology and the importance of friction coefficient have been increased...
Blood pressure is defined as the amount of force at unit area which the blood exerts on a wall of a blood vessel. The BP has a clinical importance as the basic index in the medical examination of patients. Especially, the percentage of the hypertensive is more than 15% in an adult population of Korea and hypertension is notorious as ‘a silent killer’ because it has no prior symptoms. The most important...
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