Development of Scratching Monitoring System Based On Mathematical Model of Unconstrained Bed Sensing Method

Authors: Takuya Sumi, Syoko Nukaya, Takashi Kaburagi, Hiroshi Tanaka, Kajiro Watanabe, Yosuke Kurihara

Abstract:

We propose an unconstrained measurement system for scratching motion based on mathematical model of unconstrained bed sensing method which could measure the bed vibrations due to the motion of the person on the bed. In this paper, we construct mathematical model of the unconstrained bed monitoring system; and we apply the unconstrained bed sensing method to the system for detecting scratching motion. The proposed sensors are placed under the three bed feet. When the person is lying on the bed, the output signals from the sensors are proportional to the magnitude of the vibration due to the scratching motion. Hence, we could detect the subject’s scratching motion from the output signals from ceramic sensors. We evaluated two scratching motions using the proposed system in the validity experiment as follows: 1st experiment is the subject’s scratching the right side cheek with his right hand, and; 2nd experiment is the subject’s scratching the shin with another foot. As the results of the experiment, we recognized the scratching signals that enable the determination when the scratching occurred. Furthermore, the difference among the amplitudes of the output signals enabled us to estimate where the subject scratched.

Keywords: Unconstrained bed sensing method, scratching, body movement, itchy, piezoceramics.

Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1089341

References:

[1] T. Ebata, et al., "The characteristics of nocturnal scratching in adults with atopic dermatitis”, British Journal of Dermatology Vol. 141, pp.82-86, 1999.
[2] T. Ebata, et al., "Use of a wrist activity monitor for the measurement of nocturnal scratching in patients with atopic dermatitis”, British Journal of Dermatology Vol. 144, pp.305-309, 2001.
[3] T. Ebata, H. Aizawa, R. Kamide, "An Infrared Video Camera System to Observe Nocturnal Scratching in Atopic Dermatitis Patients,” British Journal of Dermatology Vol. 23, pp. 155-155, 1996.
[4] H. Izumi, et al., "A Simplified Method for the Measurement of Nocturnal Scratching with an Infrared Video Camera,” The Skin Vol. 39, pp. 560-563, 1997.
[5] K. Umeda, et al., "A novel acoustic evaluation system of scratching in mouse dermatitis: Rapid and specific detection of invisibly rapid scratch in an atopic dermatitis model mouse,” Life Science Vol. 79, pp. 2144-2150, 2006.
[6] Y. Kawabe. K. Aritake, Y. Noro, K. Umeda, H. Mizutani, "A Study of sensor for Detection of Human Scratching Behavior during Sleep,” Tokai of society related to electricity branch union rally O-329, 2007.
[7] M. Konishi, K. Aritake, Y. Noro, K. Umeda, H. Mizutani, "A Study of sensor for Detection of Human Scratching Behavior during Sleep,” Tokai of society related to electricity branch union rally O-322, 2008.
[8] H. Yokoi, Y. Noro, K. Umeda, H. Mizutani, "Detection of Human Scratching Behavior during Sleep with Acceleration sensor,” Tokai of society related to electricity branch union rally O-323, 2008.
[9] R. Felix, S. Shuster, "A New method for the measurement of itch and the response to treatment,” British Journal of Dermatology Vol. 93, pp. 303-312, 1975.
[10] J. A. Savin, W. D. Paterson, I.Oswald, "Scratching during Dleep,” The Lancet Vol. August 11, pp. 296-297, 1973.
[11] K. Endo, H, Sumitsuji, T. Fukuzumi, J. Adachi, T. Aoki, "Evaluation of Scratch Movements by a New Scrath-Monitor to Analyze Nocturnal Itching in Atopic Dermatitis,” Acta Derm Venereol (Stockh) Vol. 77, pp. 432-435, 1997.
[12] T. Aoki, H. Kushimoto, Y. Hishikawa, J. A. Savin, "Nocturnal scratching and its relationship to the disturbed sleep of itchy subject,” Clinical and Experiment Dermatology Vol. 16, pp. 268-272, 1991.
[13] C. Occhiuzzi and G. Marrocco, "The RFID Technology for Neurosciences: Feasibility of Limbs’ Monitoring in Sleep Diseases,” Information Technology in Biomedicine Vol. 14, No. 1, pp. 37-43, 2010.