Kwang-Joon Yoon

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Design and development of Unmanned Aerial Vehicles has attracted increased interest in the recent past. Rotorcraft UAVs, in particular have more challenges than its fixed wing counterparts. More research and experiments have been conducted to study the stability and control of RUAVs. A model-based control system design is particularly of our interest since(More)
We describe the design of four ornithopters ranging in wing span from 10 cm to 40 cm, and in weight from 5 g to 45 g. The controllability and power supply are two major considerations, so we compare the efficiency and characteristics between different types of subsystems such as gearbox and tail shape. Our current ornithopter is radio-controlled with(More)
It has been over two years since we successfully develop our own design of flapping micro air vehicle with its dimension of 50cm. But more specified and detailed development to adopt the flight mechanism of natural flyers was required during downsizing its dimension. So this has driven us to the further research on efficient flight system especially on its(More)
During the past decade, lots of diverse researches have been conducted on application of smart materials to build small-scale robots. Several small, powerful, and reliable piezoelectric actuators using piezoelectric ceramic materials have been invented. Among them, LIPCA was introduced as the best unimorph actuator suitable for bio-inspired robots. The(More)
This paper introduces an insect-mimicking flapping-wing system, where wing rotation, wing corrugation, and wing clap of real insects have been mimicked. The flapping system is actuated by a unimorph piezoceramic actuator unlike most motor-driven flapping systems. The artificial wing is made of a thin polyethylene sheet and the wing corrugation is(More)
This paper describes the development of a small flying robot with semi-autopilot system, which was prepared to participate 3<sup>rd</sup> European-US Micro Air Vehicle Competition. Since there was a limitation of size and available weight in a small air robot "KU-Hawk" with 50 cm wing span, we decided to install a small lightweight semi-autopilot system.(More)
Now robot assisted laparoscopy has some problem to depend only on image of the surgical field. However, there is a research result which shows that it is possible to measure the operation force on commercialized instrument inside patient without sensors [1]. By using measured information, haptic technique can be implemented into surgical robot system.(More)
This paper presents small flying robot with a rotary wing system and an autonomous guidance and control system. Nowadays, a small flying robot such as small/micro air vehicle (MAV) can play a significant role for human's reconnaissance mission. Small hovering robot will be able to approach a dangerous area where human cannot go. In addition, comparing with(More)
There have been persistent interests in high performance actuators suitable for the actuation of control surfaces of small aircraft and helicopter blades and for active vibration control of aerospace and submarine structures that require high specific force and displacement. What really needed for active actuation is a large-displacement actuator with a(More)