• Journal of the Korean Society for Precision Engineering
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• v.23 no.2 s.179
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• pp.21-26
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• 2006

• Proceedings of the IEEK Conference
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• 1998.10a
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• pp.825-828
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• 1998

경혈을 대상으로 인체를 진단하는 의료기기들은 경혈점에 미세한 직류전류를 인가하고, 이 점에서의 전기저항과 세포의 분극에 의해 반응하는 경락체계의 균형상태를 측정하여 인체를 종합적으로 진단한다. 따라서 전 과정이 정확한 경혈의 위치에서 이루어져야만 치료효과와 진단의 신뢰성이 보장된다. 그러나 대부분의 경락관련 치료기들이 정확한 혈위식별에 어려움이 있고 사용자의 전문적 숙련을 요구한다. 따라서 선행연구에서 일정한 주파수로 교호되는 자극패턴(SPAC) 방식을 사용하여 식별률을 높인 혈위식별기 DM96A-1를 개발하였다. DM96A-1은 단일전원이 양방향으로 교호되는 전류로 자극펄스를 출력하고 측정범위가 0.5∼50㎂인 전류메터와 레벨메터를 이용하여 혈위의 전류량을 표시한다. 이에 따라 방향전환 소자의 두 채널 제어신호가 교호되는 과도기에서 두 자극패턴의 중첩 도통에 의해서 누설전류가 발생하는 경우가 있으며 이를 제거하기 위하여 정밀한 조정을 필요로 하는 불편이 있었다. 따라서 이와 같은 단점들을 보완하여 신뢰성 있는 출력 파라메터를 얻을 수 있도록 마이크로프로세서 i80c196kc를 사용하여 DM96A-2를 재 설계하였으며 임상실험에 의하여 개선된 최적 파라메터의 타당성을 검증하였다.

• Journal of the Korean Society for Precision Engineering
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• v.28 no.11
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• pp.1323-1329
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• 2011

The purpose of study was to analyze how the visual information affects balance control of individuals during single leg stance. A total of 27 young normal people (20 males and 7 females, age: $13.7{\pm}2.6$, height: $162.3{\pm}13.2$ cm, weight: $53.9{\pm}13.9$ kg) was voluntarily involved in the experiment. The subjects were requested to maintain balance for 20 seconds with eyes both open and closed on a force plate and then foot ground reaction data were collected for that duration. Results showed that mean velocity of COP in closed eyes condition was larger 1.84 times than that of the open-eyes condition and range of vertical angle was increased approximately one degree in the closed eyes condition. To accomplish a balance, the frequency power in mediolateral and anteroposterior components of the foot-ground reaction force was increased by 1.3~1.4 times. Consequently, visual absence during single leg stance can result in critical loss of balance and lead to instability of body control.

• Transactions of the Korean Society of Mechanical Engineers A
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• v.33 no.1
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• pp.27-33
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• 2009

Human postural responses appeared to have stereotyped modality, such as ankle mode, knee mode and hip mode in response to various perturbations. We examined whether human postural control gain of full-state feedback could be decoupled along with the eigenvector. To verify the model, postural responses subjected to fast backward perturbation were used. Upright posture was modeled as 3-segment inverted pendulum incorporated with feedback control, and joint torques were calculated using inverse dynamics. Postural modalities such as ankle, knee and hip mode were obtained from eigenvectors of biomechanical model. As oppose to the full-state feedback control, independent eigenvector control assumes that modal control input is determined by the linear combination of corresponding modality. We used optimization method to obtain and compare the feedback gains for both independent eigenvector control and full-state feedback control. As a result, we found that simulation result of eigenvector feedback was not competitive in comparison with that of full-state feedback control. This implies that the CNS would make use of full-state body information to generate compensative joint torques.

• Journal of the Institute of Electronics Engineers of Korea TE
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• v.39 no.2
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• pp.34-43
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• 2002

In this paper, with the reference of the pulse wave acquired by the pulse-checking device, it is measured the impedance on the key measuring points of the 12 kyungmaks of the human body's left and right by using 24-channels Yangdorak machine. Then, based on the Fuzzy theory, this study diagnosed the each meridian's strength and weakness. After that, both the strengthening and weakening stimulus of magnetic fields are applied to the dominant direction to find out how the degree of strength and weakness of the meridian changed. Ultimately, the magnetic therapy that can stimulate the magnetic field at the time of diagnosis and thereby balancing the interactive of five-system(O-hang) have been materialized. For the stimulation of magnetic fields, a stimulating device which can change the direction and time on a specific part of the key measuring points of the limbs of 24 kyungmaks have been developed and used. The therapeutic methods are as follows. First, the strength and weakness of the meridian have been determined. Second, both the extremely weak meridian of Yin(Shade) and Yang(Shine), and the extremely strong meridian of Yin and Yang were adjusted by applying appropriate ascending and descending stimuli respectively. All these adjusting processes can now be carried out automatically on a personal computer(PC).