Stress Assessment

OData support
Dr. Jobbágy Ákos Andor
Department of Measurement and Information Systems

For the subject of my thesis I chose to augment and examine the stress level measurement system which was developed and built in the past two semesters.

It is proved that the growth of the normal stress level cause performance degradation, and the standard of living and health can deteriorate.

People's stress tolerance is individual. This is why the individual is on the focus of the method I devepoled. It helps the person to learn a stress-relieving technique that can lead to the solution of the problems.

The galvanic skin reflex (the change in the skin's conductance) is one of the most reliable indicator of the stress level. In this measurement the alteration is immediately detectable and can be measured easily. The base of the measurement is the change in the skin's conductance.

Two commonly used diagnostic tools are the use of electrocardiogram and the pulse oximeter (photopletizmograph). The heart rate and its variability can be calculated, and this is another indicator of the change of the stress level.

In my thesis I present the developed system's expansion and examination. In recent semesters the GSR measurement system and the user program (written in Java) has been completed. In this semester the expansion of the hardware and the software has been done.

The microcontroller's program needs to be updated to be able to handle all three measured parameters. The Java program needs to be modified to be able to recieve and process the data. The user program needs to show the data in two graphics, it needs to save and open the measured signals.

The other task is to examine the parameters of the system. We need to know the long term stability and noisiness of the system.

The reproducibility of the measurements is a fundamental question. The sampling frequency limit, and the limit of data transmission speed towards the PC must be known.

In my thesis I describe in detail the steps of the development and how I implanted them, what problems I went into and how I found the solutions for them.


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