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확장된 주변시 표현을 지원하는 머리부착형 시각장치에 관한 연구
허지웅,김광욱 한국정보과학회 2019 정보과학회논문지 Vol.46 No.8
The field of view (FoV) is one of the main properties of virtual reality (VR) systems with head-mounted displays (HMDs). While preceding VR studies have suggested novel methodologies to extend the FoV of HMDs, there were limitations in those methods, including: heavy weight, high cost, and screen distortion. The observation through the human retina indicated that the density of human photoreceptors are distributed variedly between the central and peripheral visual fields. The sparse peripheral display (SPD) was proposed based on these observations. In this study, we suggest and compare the combination of SPD technologies using different number (2-80) of light-emitting diodes (LEDs) and different tasks (visual search and emotion tasks). The results showed that the visual-search task with use of six LEDs and there were no significant differences in the emotion task. Discussion of the potential applications of SPD-HMD systems, including therapeutic techniques to assist handicapped people was done. Head-mounted displays (HMDs) 기반의 Virtual Reality (VR) 장비들은 시야각(Field of View; FoV)이 핵심적 요소이다. 이를 해결하기 위하여 많은 연구들이 진행되었으나, 화면 왜곡현상, HMD 무게 증가 등의 문제점이 존재하였다. 이 문제들을 해결하고자 인간의 시각 시스템에서 중심시와 주변시의 시각세포의 분포가 다르는 점을 활용한 Light Emitting Diode (LED)기반 Sparse Peripheral Display (SPD) HMD가 제안되었다. 본 연구에서는 주변부에 80개에서 2개까지의 다양한 조합의 LED를 배치하고, 탐색과제와 감정반응과제를 통해 그 효과를 확인하였다. 연구 결과에 따르면, 6개의 LED를 HMD의 주변부에 배치하였을 때 탐색실험에서 최적의 효율을 보였으며, 감정반응과제에서는 유의미한 차이를 보이지 않았다. 본 연구 결과에 대한 잠재적 응용과 한계대해 본 논문에서 논의하였다.
Layer-by-layer self-assembled microwave absorbing thin film for stealth applications
허지웅,홍진기,최다희 한국공업화학회 2016 한국공업화학회 연구논문 초록집 Vol.2016 No.0
We demonstrate a simple method for fabricating multilayer thin films containing ferrite nanoparticles, using layer-by-layer (LbL) self-assembly. These films have microwave absorbing properties for possible radar absorbing and stealth applications. To demonstrate incorporation of inorganic ferrite nanoparticles into an electrostatic-interaction-based LbL self-assembly, we fabricated two types of films: (1) a blended three-component LbL film and (2) a tetra layer LbL. We compared surface morphologies, thicknesses, and packing density of the two types of ferrite multilayer film. Ferrite nanoparticles were prepared from an aqueous precursor solution. The ferrite nanoparticles were characterized by X-ray diffraction, energy dispersive X-ray spectroscopy, transmission electron microscopy, and scanning electron microscopy. Thickness growth and surface morphology were measured using a profilometer, atomic force microscope, and scanning electron microscope.