Because of environmental and resource depletion issue, there is a growing interest in eco-friendly vehicle, especially electric car. The small electric city car, called "Micro Mobility" has gained in popularity because of generalization of households under two or less members. In this study, to improve mechanical characteristics of Micron Mobility, 2-speed planetary transmission is designed, manufactured, and its efficiency is verified.

The purpose of this study is to introduce the Inventogram program and create new ideas and looking to take advantage of this product. So all this research is that it can be an easy invention. In this study, we'll demonstrate the idea of creating a derivation of the coffee roaster grinder to crush the coffee green bean utilize Inventogram program to prove it.

There are many risks in using grass cutter because of the pebble in grass and high speed rpm when the cutter hits the hard objects in grass. In this study, the existing patents are surveyed and classified for the new mechanism about the bottom safety cover. The new mechanism was modelled and the planetary gear are designed. The power source (engine or motor) will rotate the sun gear and the carrier of planetary gear is fixed into handle frame. The ring gear will drive the final cutter. The carrier fixed the bottom safety cover through the planetary gear hole at the handle bar. In this paper, we develop a new mechanism and analyze the idea for safe grass cutter and investigate the possibility of having patent through patent search.

Driving mechanism, the central part of a robot, was designed in this study. Power for the motive drive was acquired by directly connecting the motor shaft in worm shape of the low-end DC motor, car window motor, to a decelerator. The decelerator consists of a worm gear to receive power from the motor shaft, a pinion gear to be connected in line with the worm gear, and an output shaft to be engaged to the pinion gear. Motion driving is achieved by the power from the motor shaft with the designed gears, transferred to the deceleration mechanism and to the output gear

World Widely, a lot of gearboxes are being developed for the increase of fuel efficiency. Among them, CVT has an infinite gear and shifts gear at the best situation which makes it have no impact by changing speed and reduce the expense of fuel. We designed and manufactured 2ranked gearbox for V-belt similar to CVT. We studied an energy generated when it is functioning and had an experiment of forwarding power of it. These studies are planned to find out its functions and the efficiency of forwarding power of it.

The Automobiles with a combustion engine use a transmission for increasing drive force, reverse-move and maintaining non-load condition in general. In the Electric automobile system, output-axial can be operated just by controlling the motor manipulated with power. It also does not need reverse-gear by rotating the motor in the opposite direction. Designed to assemble two different types of planetary gear ratio and to be input torque of input-axial in sun gear and divide ring gear Ⅰ, Ⅱ and then after one of ring gear is fixed, in accordance with the planetary gear velocity ratio, the first gear has 0.136 decreased speed and second gear has 0.240 decreased speed, separately. While the planetary gear type transmission showed over the 92% of efficiency in the all of velocity range. The transmission proposed in this study can be expected to apply to the electric vehicle or others.

This paper presents a force control based on the observer without taking any force or torque measurement from the robot which allows realizing more stable and robust human robot interaction for the developed multi-functional upper limb rehabilitation robot. The robot has four functional training modes which can be classified by the human robot interaction types: passive, active, assistive, and resistive mode. The proposed observer consists of internal disturbance observer and external force observer for distinctive performance evaluation. Since four training modes can be quantitatively identified as impedance variation, position-based impedance control with feedback and feedforward controller was applied to the assistive training mode. The results showed that the proposed sensorless observer estimated cleaner and more accurate force compared to the force sensor and the impedance controller embedded with the proposed observer completed the assistive training mode safely and properly.