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In the harbor area, precise steering is the most important operation. This operation requires a set of adequate thrust devices with exactly taken into account surge, sway and yaw motions. However, at low speed maneuvering, the effectiveness of actuators is nominal, thus using assistance of tugboat is necessary to ensure safe berthing operation. In this paper, the mathematical model of system that...
Most of the present drive systems of the home service robots and the industrial robots use non-holonomic systems that function only when the robots are moving. For instance, the average vehicle can only be steered when driving so instant movement in all directions is not possible. And that is why the holonomic drive system is attracting attention. In this paper, we propose a holonomic system using...
A traveling-wave Mach-Zehnder type electro-optic modulator using InAs/InGaAs columnar quantum dots is fabricated. The device has the measured modulation efficiency of 333.3 deg/Vmiddotmm for TE mode and 300 deg/Vmiddotmm for TM mode at 1.31 mum
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