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2007, 8

Yoshifumi Fujita, Mitsuo Ohta

A trial on correlative effect of higher order between utility and risk based on acoustic and magnetic fields around VDT

language: English

received 03.01.2007, published 12.03.2007

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In this paper, first, a methodological principle trial for the quantitative evaluation of the correlative and/or cumulative effect on indoor high-technology pollution has been proposed under an absolutely inseparable relationship between utility and risk at the same time and in the same ring. Then, the effectiveness of the proposed method is partly confirmed through some principle experiment between sound (served for utility) and leaked magnetic field (served for risk) especially before and after attachment of a magnetic oscillator called Tecno AO (CE mark, ISO sanction).

10 pages, 7 figures

Сitation: Yoshifumi Fujita, Mitsuo Ohta. A trial on correlative effect of higher order between utility and risk based on acoustic and magnetic fields around VDT. Electronic Journal “Technical Acoustics”,, 2007, 8.


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Yoshifumi Fujita received his B. E. degree in 1974 from Kyoto Institute of Technology and his M. S. degree in 1976 from Kyoto University, and his Dr. degree of Eng. in 2004 from Okayama University of Science. He was a Research Associate in 1976, Lecturer in 1982, and Associate Professor in 1987 in the Department of Mech. Eng., Kure Techinical College, Associate Professor in 1993, and Professor in 1995 in the Department of Management and Information Science, Onomichi Junior College, and Professor in 2001 in the Faculty of Economics, Management and Information Science. He is engaged in research on random signal processing and evaluation for EM and sound waves in environment. He is a member of the Acoust. Soc. Jap., IIAV, Inst. Syst. Contr. Inf. Eng. and IEICE.

e-mail: fujita(at)


Mitsuo Ohta was born in 1928. He received his B.Sc. degree in physics in 1952 and his D.Sc. degree from Kyoto Univ. in 1961. After working as an associate professor at Kobe Univ. and serving as a professor at Fukui Univ. and Hiroshima Univ., he retired from Hiroshima Univ. (as an emeritus professor) and then Kinki Univ. He was named as a fellow of the International Institute of Acoustics and Vibration (IIAV) in 1999 and as a fellow of the Society of Instrument and Control Engineers of Japan in 1996. He has also received the title on Advising Engineer authorized by the Japanese Society of Noise Control Engineering. His research fields of study include microwave, dielectric, ultrasound and electromagnetic wave propagation and control engineering. In recent years he has conducted research in sound and vibration, stochastic systems engineering, signal information processing and EMC. He got two prizes in praise of his paper and his merit from the Acoustical Society of Japan and a prize of environmental protection from Japanese government and also Marquis Who’s Who in Science & Engineering 2005-2006.

e-mail: ryxyj592(at)