As high quality image is required for digital cameras in recent use, the image stabilization technique has drawn much attention to prevent image degradation from shaky disturbance by users. In this paper, the optical image stabilization (OIS) system for DSLR (Digital Single Lens Reflex) camera is considered. First, the analytic model of an OIS system is presented to demonstrate the mechanism of image destabilization due to unknown disturbance that causes blurry images on CCD sensor. Then, to enhance the stabilization performance, a sliding mode control based on the min-max nonlinear control is introduced. Through the experiments and simulations, the effectiveness of the proposed method will be verified.

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Herpes zoster virus (HZV) infection is reactivation of Varicella Zoster virus that entered into the dorsal root ganglia during prior chicken pox infection, then remained in a latent form. HZV is characterized by its typical unilateral vesicles and rash along with a dermatome involvement. In its early stage, the only symptom may be prodromal odontalgia. Therefore, the difficulty in its diagnosis may lead to delayed HZV treatment as well as unnecessary dental procedures. A case of HZV infection of the trigeminal nerve branch is presented here, which was not properly diagnosed at the initial examination, but later confirmed as HZV infection with meningitis.