We describe a methodology to estimate the pulse pressure variation ∆Pp index from the arterial blood pressure (ABP) signal alone. This eliminates the need for simultaneously acquiring and monitoring airway pressure. The technique uses nonlinear rank-order filters to demodulate the respiratory component modulating the ABP signal. Furthermore, we present a simple mathematical model that can be us...

This work presents a convenient and non-contact acoustic sensing approach for measuring ground vibration. This approach, which uses an instantaneous dynamic tire pressure sensor (DTPS), possesses the capability to replace the accelerometer or directional microphone currently being used for inspecting pavement conditions. By measuring dynamic pressure changes inside the tire, ground vibration ca...

An intrauterine pressure catheter (IUPC) is a device placed inside a pregnant woman?s uterus [2] to monitor uterine contractions during labor. During labor, a woman?s uterus [2] contracts to dilate, or open, the cervix [3] and push the fetus [4] into the birth canal. The catheter measures the pressure within the amniotic space during contractions and allows physicians to evaluate the strength, ...

Cardiovascular disease is the leading cause of death globally. Cardiovascular monitoring is important to prevent diseases from progressing. The jugular venous pressure waveform (JVP) is able to provide important information about cardiac health. Factors such as mechanical deformations, electric abnormalities, and irregular external forces change the fundamental shape of the JVP. However, curren...

This paper overviews findings, potential and limitations of a low-cost vertical distance measurement system, as regards lab research and experimental education on MEMS barometric pressure sensors, and future research directions are also recommended.

In this paper, we focus on the frequent glitches of general family cars. Based on the Neural Network theory and combining with the Micro-chip processor technology, we design an expert system-‘‘Integrated Cars Repairing Tools” (ICRT) and the size of the proposed ICRT is quite small and achieves the following attractive functions: (1) Portable Electric-jack, (2) Electric Tire-pressure-meter, (3) ...

Pressure ulcers are a major problem for wheelchair users [1]. Pressure ulcer prevention typically involves the use of a pressure-distributing wheelchair cushion and/or by periodic pressure relief (PR) or weight shift activities performed by the subject [2]. In order to gauge the efficacy of these PRs in preventing pressure ulcers, it is necessary to compile a record of their nature and frequenc...

Nacrtak The motion resistance ratio, gross traction ratio and net traction ratio of a wheel cable skidder were determined and mathematical models derived for three tire inflation pressure values with or without tire chains on forest road in mountainous conditions. The motion resistance ratio increases with the increase of tire inflation pressure. On the contrary, the gross traction ratio increa...

introduction pressure ulcers are tissue damages resulting from blood flow restriction, which occurs when the tissue is exposed to high pressure for a long period of time. these painful sores are common in patients and elderly, who spend extended periods of time in bed or wheelchair. in this study, a continuous pressure and temperature monitoring system was developed for pressure ulcer preventio...