RU2317779C1 - Method for determining professional pc user fatigue state - Google Patents

Abstract

FIELD: medicine.

SUBSTANCE: method involves periodically producing acoustic oscillations in bandwidth of 0.5-0.6 kHz. They are amplified to acoustic pressure level that is no more than 10% as high as auditory threshold. It is broadcasted into room where working on computers takes place. A user is considered to reach impermissible fatigue level, if registration time growing longer than 2 s.

EFFECT: enhanced effectiveness in obtaining objective fatigue level estimate in computer operation time.

Description

The invention relates to the field of medicine, namely to the field of functional diagnostics, and can be used to determine optimal modes and working conditions by professional users of a personal computer, preferably persons engaged in working with students.

Traditionally, the working day, including for professional users of a personal computer, is 8 hours. However, from the practice of monitoring the operation of these users, it is known that the attention of users and their perception of information in the process of work is usually weakened. Therefore, it is desirable in the process of professional users using a personal computer to determine the point in time when attention is weakened and it is necessary to stop working due to the high probability of a personal computer user making errors in work.

Known (RU, patent 2196510) is a method for assessing human fatigue by periodically measuring the critical frequency of fusion of light flickers. According to the known method, the rate of change of the critical frequency of light flicker is calculated from the measured values and the phase trajectory of the dynamics of the critical frequency of light flicker is plotted in coordinates "the value of the critical frequency of light flicker is the rate of change of the critical frequency of light flicker", while the absolute value of the critical frequency of light flicker display the coordinate value along the X axis, the rate of change of the critical frequency of light flicker display the coordinate along the axis Y, while if the rate of change is positive, the point is above the X axis, if negative, below the X axis, the time of onset of fatigue and overfatigue is determined by the change in the direction of the phase trajectory.

The disadvantage of this method with respect to determining the time for graduation by a professional user of a personal computer should be recognized as its complexity, which prevents the use of the known method as a method of rapid diagnosis.

Known (RU, patent 2191536) a method for the diagnosis of fatigue. According to the known method, the threshold sensitivity of the retina of each eye is determined, the arithmetic mean value of the threshold sensitivity of the retina of both eyes is calculated, the average arithmetic value of the threshold sensitivity of the retina of both eyes is compared with a value of 100 μA and the presence of fatigue is diagnosed with an average arithmetic threshold sensitivity of the retina of both eyes of 100 μA or more.

The disadvantage of this method with respect to determining the time for graduation by a professional user of a personal computer should be recognized as its complexity, which prevents the use of the known method as a method of rapid diagnosis.

The closest analogue of the present invention can be recognized (RU, patent 2241377) a method for the diagnosis of general fatigue of the body. According to the known method, the tuning time of the tuning fork with a sound frequency of 128 Hz for each ear in seconds is determined, the two obtained values are added up, the total value of the tuning time of the tuning fork is compared with a value of 141 s and the presence of fatigue is diagnosed with a total tuning time of tuning of a tuning fork of 141 s or more.

Although the known method is technically uncomplicated, it is still not suitable for use as an express diagnostic method for determining the time of fatigue of a professional user with a personal computer and, accordingly, the time for stopping work.

The technical problem solved by the proposed method consists in optimizing the choice of the duration of the professional user using a personal computer.

The technical result obtained by implementing the proposed method consists in obtaining an objective assessment of the fatigue of a professional user with a personal computer in the process of work

To achieve the specified technical result, it is proposed to use a method for determining the end time for a professional user using a personal computer, including generating sound vibrations and registering them by the user, and when implementing the method, sound vibrations are periodically generated in the range from 0.5 to 0.6 kHz, amplify them to values of sound pressure, not more than 10% above the threshold of audibility, and broadcast to the workroom in which classes take place, while achieving and the user of the level of fatigue, which impedes full-fledged work, is judged by the increase in the time of registration of the value over 2 seconds. Upon reaching the specified limit, it is advisable to stop working.

During the development of the proposed method, it was experimentally established that professional users with a personal computer are most sensitive to recording acoustic vibrations precisely in the region from 0.5 to 0.6 kHz, lying in a range located significantly below the usual range of acoustic waves detected by the human ear (1 , 0-5.0 kHz). Moreover, the specified range of acoustic waves (0.5-0.6 kHz) lies significantly higher than the range of infrasound and does not cause the listener a state of discomfort. The time of registration (detection) by a personal user of a personal computer of acoustic radiation in the indicated frequency range with a slight (up to 10%) excess of the sound pressure of the auditory threshold over 2 seconds unambiguously characterizes the user's fatigue level.

Using the frequency range below 0.5 kHz significantly increases the sound recognition time and, in addition, approaching the infrasound range causes a feeling of depression. The use of a frequency range above 0.6 kHz is not typical for professional users of a personal computer. Using the specified excess of the auditory threshold allows you to detect fatigue within the first seconds after the start of the generation of acoustic vibrations.

Users designate registration by any known method acceptable for use in the workplace (press the registrar button, light the lamp located in front of each user, simply raise their hand, perform a predetermined operation using a personal computer).

To justify the operability of the proposed method, parallel studies of the fatigue state of the software compilers of the Arkhangelsk Computing Center of the Ministry of Internal Affairs were conducted using the proposed method and the method used as the closest prototype analogue.

Example 1. The subject - operator M., 27 years old. At the beginning of an 8-hour working day, the duration of perception of a tuning fork with a sound frequency of 128 Hz for air conduction of sound was: 57 s with the right ear and 63 s with the left ear. The total duration of perception is 120 s. There is no general fatigue of the body. The recording time of the acoustic signal of 0.56 kHz with a sound pressure of 9 dB, exceeding the hearing limit of 7.7% left 0.9 s. Fatigue is absent. Two hours later, under the same conditions, the duration of perception by the right ear was 61 s, by the left ear - 77 s, a total of 138 s, the registration of the acoustic signal was 1.3 s. Fatigue is practically absent. The number of errors when typing for dictation of text for 1000 characters is 1.6%. Four hours later, respectively 66 s, 88 s, 154 s and 1.6 s. Fatigue is practically absent. The number of errors when typing dictation of a text of the same degree of difficulty per 1000 characters is 2.2%. After six hours, respectively 71 s, 97 s, 168 s and 1.9 s. Fatigue is significant, but the number of errors when typing dictated text of the same degree of difficulty per 1000 characters is 3.8%. By the end of the working day (seven hours thirty minutes), the duration of perception of the tuning fork was 82 s with the right ear and 114 s with the left ear. The total duration of perception is 2196 s. Signal perception - 2.2 s. Diagnosis: General fatigue of the body. The number of errors when typing dictated text of the same degree of difficulty per 1000 characters - 8.7%

The results of the proposed method are fully correlated with the results of the prototype method.

The application of the method allows you to reasonably determine the duration of the personal user using a personal computer.

Claims (1)

A method for determining the state of fatigue of a professional user by a personal computer, including generating sound vibrations and registering them by the user, characterized in that periodically generate sound vibrations in the range from 0.5 to 0.6 kHz, amplify them to a sound pressure value of not more than 10 % exceeding the hearing threshold, and broadcast to the room in which the computer is working, while the user reaches an unacceptable level of fatigue is judged by the increase in registration time and values above 2.