This paper discusses the design and implementation of a three dimensional magnetic tweezer system to achieve measurement of mechanical properties of living cells by touching a magnetically levitated micro probe to specimen cells. The system consists of a three dimensional magnetic tweezer, an inverted optical microscope for 3D probe position measurement, and control/interface software. For reducing assembly error in the magnetic tweezer and accurate adjustment of the gap distance between sextuple magnetic poles that are sharpen-tipped permalloy rods having a driving coil on each, a pole positioning mechanism was implemented in the magnetic tweezer. Finally, two experiments were performed on the fabricated prototype: trajectory tracking in which a magnetic particle of 4.5μm diameter floating in medium was steered to follow target trajectories, and homogeneity evaluation that compared force generation from each magnetic pole.

This paper describes the relationship between overall speech quality and individual psychological factors, which are extracted based on conversational quality evaluation experiments, for developing an opinion model for high-quality speech communications. We propose the concept of an opinion model for such services taking into account psychological aspects, as well as overall quality. The experimental results showed that such services had four psychological factors, such as fidelity, activity, harmony, and potency. We also develop part of the model and demonstrate the validity of the proposed concept.