The Japanese Journal of Ergonomics

[title in Japanese]

[in Japanese]

1982 Volume 18 Issue 1 Pages 1
Published: February 15, 1982
Released on J-STAGE: March 11, 2010

DOIhttps://doi.org/10.5100/jje.18.1

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Home accidents and consumer products safety

Michiko AOYAMA

1982 Volume 18 Issue 1 Pages 3-10
Published: February 15, 1982
Released on J-STAGE: March 11, 2010

DOIhttps://doi.org/10.5100/jje.18.3

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Safety packaging of household medicines for poison prevention

Fuminae KUBO

1982 Volume 18 Issue 1 Pages 11-14
Published: February 15, 1982
Released on J-STAGE: March 11, 2010

DOIhttps://doi.org/10.5100/jje.18.11

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Self-contained smoke detectors

Seiichi IKEDA

1982 Volume 18 Issue 1 Pages 15-18
Published: February 15, 1982
Released on J-STAGE: March 11, 2010

DOIhttps://doi.org/10.5100/jje.18.15

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Sefety problem of building (apartment house) in megalopolis

Shoichi HOSHINO

1982 Volume 18 Issue 1 Pages 19-21
Published: February 15, 1982
Released on J-STAGE: March 11, 2010

DOIhttps://doi.org/10.5100/jje.18.19

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Design of household electrical appliances for safety

Yoshiharu IWATA

1982 Volume 18 Issue 1 Pages 23-28
Published: February 15, 1982
Released on J-STAGE: March 11, 2010

DOIhttps://doi.org/10.5100/jje.18.23

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How to prevent over-turning of furniture during earthquake motions

Yuji ISHIYAMA

1982 Volume 18 Issue 1 Pages 29-33
Published: February 15, 1982
Released on J-STAGE: March 11, 2010

DOIhttps://doi.org/10.5100/jje.18.29

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Classification of myo-electric discharges from the surface EMG power spectrum-with a special reference to static and dynamic movement of the leg

Akira NAGATA, Masuo MURO

1982 Volume 18 Issue 1 Pages 35-42
Published: February 15, 1982
Released on J-STAGE: March 11, 2010

DOIhttps://doi.org/10.5100/jje.18.35

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The surface electromyogram (EMG) was analyzed to assess the frequency characteristics of the myo-electric signals (as ZONES determined by the most contributed power spectral density) in four male subjects. The static movement of the muscle contraction was consisted of four different isometric exercises; standing, back-inclination, fore-inclination, and squat position. The dynamic movement was composed of two exercises of continuous vertical jumping and landing from the standardized table.
During 60sec bout of movement, the significantly contributed EMG power spectral density (over-40dB) was classified into three frequency zones, namely the lower (<45Hz), middle (46-80Hz) and higher (>81Hz) bands according to the Claster and Discriminant Analyses. Three frequency zones were linearly related to these movement patterns, i. e., the lower frequency zone was appeared in the static movement of M. Rectus Femoris whereas the middle and higher zones were shown in the dynamic movement of M. Gastrocnemius. These frequency zones analyzed in the present study were appeared to be quite dependent on the movement pattern and the muscle fiber type. The frequency of the anti-gravitational (tonic activity) muscle groups showed the greatest contribution of the lower frequency zone during the sustained muscluar contraction. In contrast, the kinetic (phasic activity) and fast contractive muscle groups were characterized with the higher frequency zones during the active muscular contraction of the jumping or the landing movement.

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Miss-judgment in visual inspection and about its mechanism

Ikuo ITO

1982 Volume 18 Issue 1 Pages 43-49
Published: February 15, 1982
Released on J-STAGE: March 11, 2010

DOIhttps://doi.org/10.5100/jje.18.43

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So-called Type 1 and 2 errors were discussed with the one channel entropy model which was introduced by the assumption that the inspectator will judge on criterion to minimize the cost expected by miss-judgments. The discrepancies of actual data from the entropy model were computed, and it was found these discrepancies varied widely by the cost ratio of good's manufacturing and recovering of rejectives.
The fact was also found that reactions were introduced naturally to move the criterion point to make even the results when the same kind of result of judgment had continued.

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Information of '81 HFS annual meeting

Yoshitomo OKADA

1982 Volume 18 Issue 1 Pages 49-50
Published: February 15, 1982
Released on J-STAGE: March 11, 2010

DOIhttps://doi.org/10.5100/jje.18.49

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Age change of temporal accuracy performance in rhythmic movement

Tomoko NIIHARA, Katsuhiko KUSANO

1982 Volume 18 Issue 1 Pages 51-55
Published: February 15, 1982
Released on J-STAGE: March 11, 2010

DOIhttps://doi.org/10.5100/jje.18.51

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1093 boys and girls, aged from 5 to 17 years, were measured for their temporal accuracy in rhythmic movement in order to observe cross-sectionaly the age change pattern of timing anticipation performance. As the level index of temporal accuracy, mean timing error of movement to a required tempo (900msec time intervals) was calculated from the simultaneous polygraphic records of 30 repetitive switch depression and sound stimuli which is presented throughout the exercise. The results indicated that the developmental change of temporal accuracy was essentially complete by the age of twelve. The same age change pattern also appeared in the case of leg stepping movement, though its accuracy level was lower than that of the finger. No performance difference was found between boys and girls.

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