Jeong-Hoi Koo

Learn More
To cool down image sensors in observation satellites, a miniature linear cryogenic cooler is used. The cooler operates at a constant frequency and it creates the main vibration disturbance that is transmitted to the image sensors, causing poor image quality. A semi-active vibration system using a tuned vibration absorber (TVA) has shown to be effective for(More)
Miniature cryogenic coolers are widely used to cool down sensitive image sensors in observation and surveillance satellites. The linear actuator in the cooler compressor operates at a relatively constant rate and this is the main source of vibration disturbance transmitted to the imaging sensor. Passive vibration isolation with and without an absorber, and(More)
This paper presents a new miniature haptic button based on MR fluids which conveys realistic and exiting haptic button profiles in small handheld devices. A novel mechanism is presented to maximize the resistive force and create various kinesthetic sensations even in the small size. After construction of a prototype, the performance of the proposed haptic(More)
  • 1