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Relation between Lumbar Twist Angle and Surface Electromyogram (EMG)
Yasuko Maekawa,Akira Shiozaki,Yukie Majima 대한전자공학회 2009 ITC-CSCC :International Technical Conference on Ci Vol.2009 No.7
This study measured the twist angle of the lumbar region and the surface electromyogram (EMG) and examined their correlation to elucidate the influence of “twist” on lower back pain (LBP). Using a goniometer (two-way angle and twist sensors) and an EMG (SX230;DKH Co., Ltd.), we conducted measurement by affixing the goniometer on the lumbar vertebral column and the EMG sensor on the right and left sides of L4 (of the erector muscle of the spine). The results show that EMG has higher correlation with twist angle in a standing posture keeping feet closed and has higher correlation with the twist angular velocity in a standing posture keeping feet open in breadth of shoulders. And twist with anteversion has an influence on the lumbar region more.
Hand Gesture Region Extraction Using Skin-Color Histogram
Akio Ogihara,Hiroshi Matsumoto,Akira Shiozaki 대한전자공학회 2007 ITC-CSCC :International Technical Conference on Ci Vol.2007 No.7
The objective of this work is to improve the precision of extracting the region of hand gesture by using the color histogram of the hand gesture region.
Shin-ichiro Iwamo,Akira Shiozaki 대한전자공학회 2007 ITC-CSCC :International Technical Conference on Ci Vol.2007 No.7
In the acquisition of projection data in X-ray CT, logarithm operation is indispensable. But noise distribution is asymmetrically projected by the nonlinearity of logarithm operation, and the precision of the CT number of a reconstructed image degrades remarkably. Previously we proposed a simple correction method of the projection data according to the statistical distribution of noise. But when captured photons are very few, a detector output-signal frequently has negative value and we have to carry out clamp processing compulsorily due to the non-zero/non-negative restriction in the logarithm operation. In this paper, we propose a new method for statistically rectifying not only the influence of the nonlinearity of logarithm operation but also the influence of clamp processing. Furthermore, computer simulations using numerical phantoms are carried out to check the validity of the proposed method, and the quality of reconstructed images is compared with that of a conventional method.