Takahiko Nakamura

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In this paper, a wearable walking support system for people who have difficulties in walking because of weakened lower extremities is proposed. We propose a model-based control algorithm for the wearable device without using biological signals, that is, the knee joint support moment is calculated as a function of the user’s posture and the GRF based(More)
—This paper considers bifurcation phenomena in a simplified hysteresis neural network. The network consists of three cells and has three control parameters. We have discovered that the simple system exhibits various attractors: stable equilibria, periodic orbits, and chaos. Since the system is piecewise linear, the return map and Lyapunov exponents are(More)
— In this paper, to support antigravity muscles during stance phase more strongly, we propose a new wearable antigravity muscles support system, which supports antigravity muscles around the knee and hip joint. In this system, a posture-based control algorithm for the device without using biological signals is implemented to the wearable antigravity muscles(More)
We report a rare case of large cell neuroendocrine carcinoma (LCNEC) of the lung with cancer-associated retinopathy (CAR). To our knowledge, only two cases of LCNEC with CAR have been reported, one in 1995 and another in 2013. CAR, typically associated with small cell lung cancer (SCLC), is one of the paraneoplastic syndromes with deterioration of visual(More)
In this paper, to construct the system, which can assist daily activities of physically weak person more smartly, we propose a new wearable antigravity muscles support system, which supports antigravity muscles based on the posture and motion of user. In this system, a dynamics-based control algorithm for the device without using biological signals is(More)
We have developed a wearable anti-gravity muscle support system, which assists daily activities of physically weak persons by reducing the load to lower extremities. Many activities of human beings are performed smartly by cooperative motions of different body parts to distribute loads. In this paper, we propose a dynamics-based support concept adapted to(More)
A rescue robot in a disaster area should have a mechanism to move on irregular surfaces. Actual disaster spot consists of an irregular surface such as inside of a collapsed house. However, it is mostly surrounded by many flat surfaces such as roads to that spot or undamaged area inside that spot. A robot that works under rescue operation should not only(More)
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