A5101731550- Advanced Optical Imaging Technologies
- Urbanization and City Planning
- Korean Urban and Social Studies
- Digital Holography and Microscopy
- Geography Education and Pedagogy
- Financial Crisis of the 21st Century
- Virtual Reality Applications and Impacts
- Liquid Crystal Research Advancements
- Regional Development and Environment
- Spatial Cognition and Navigation
- Geographic Information Systems Studies
- Photorefractive and Nonlinear Optics
- Interactive and Immersive Displays
- Advanced Vision and Imaging
- Tactile and Sensory Interactions
- Energy Load and Power Forecasting
- Orbital Angular Momentum in Optics
- Urban, Neighborhood, and Segregation Studies
- Augmented Reality Applications
- Regional Economics and Spatial Analysis
- Innovation and Knowledge Management
- Regional Economic and Spatial Analysis
- Photopolymerization techniques and applications
- Digital Games and Media
- Environmental Education and Sustainability
Kyungpook National University
2014-2024
Seoul National University of Education
2016
In this paper, we propose a real-time incoherent digital holographic (IDH) recording system free from bias and twin-image noises. A motionless three-step polarization-encoded phase-shifter operating at 99 Hz is realized with two electrically controllable birefringence-mode liquid crystal cells in tandem geometric phase lens polarizers. Based on the proposed optical configuration, coaxial straight-line self-interference IDH devised. Notably, elimination of noise three phase-shifted images...
We propose a near-eye display optics system that supports three-dimensional mutual occlusion. By exploiting the polarization-control properties of phase-only liquid crystal on silicon (LCoS), we achieve real see-through scene masking as well virtual digital imaging using single LCoS. Dynamic depth control mask and image is also achieved by focus tunable lens (FTL) pair opposite curvatures. The proposed configuration LCoS curvature FTL enables self-alignment at an arbitrary without distorting...
Recently, self-healing materials have evolved to recover specific functions such as electronic, magnetic, acoustic, structural or hierarchical, and biological properties. In particular, the development of protection coatings that can be applied lens components in vision systems augmented reality glasses, actuators, image time-of-flight sensors has received intensive attention from industry. present study, we designed polythiourethane dynamic networks containing a photothermal...
This article investigated the pedagogical potential of SimCity simulation game in an urban geography course. University students used to build their own cities and applied a wide range theories support structures. Moreover, critically evaluated logic functioning compared real-world contexts principles. The believed activity provided them with opportunities promote geographic creativity, resulting diverse, unique, interesting cities. findings demonstrate that use can be effective tool for education.
This article examined the role of task demand and its effects on transfer in geographic learning. Student performance was measured through eye-movement analysis two related experiments. In Experiment 1, participants were told that they would travel an area depicted photographs either driving automobile or observing scenery. 2, a map administered which students asked to find target road map. The results showed condition, focused structural information images, such as routes connections....
While understanding green energy development and what drives it are important, there is increasing consensus that sustainability transitions concerning usage need to be viewed in terms of the place specific contexts, including education, critically mold them. In order support transitions, information knowledge building not enough; must turned into action. This research examines potential efficacy Korea's efforts this regard via an analysis K3–K12 geography education curriculum texts...
A geometric phase (GP) integral floating display can provide multifocal three-dimensional (3D) augmented reality (AR) images with enhanced depth expression by switching the focal modes of GP lens via polarization control. However, using temporal multiplexing to switch between optics causes flickering as each 3D AR image is fully presented in different frames and their luminance profile becomes easily recognizable, particularly number available increases. Here, we propose a novel technique...
Here, we present triple sets of wavefront modulation by proposing quarter‐waveplate‐based GPL (QWP GPL). We demonstrate nine depth‐switchable AR imaging functions with a bi‐stack condition the QWP modules. The presented QWP‐based module scheme is advantageous for increasing layers without switchable optic units required. In addition, display optics based on can further improve form‐factor issues and properties.
도시 공간의 역동성에서 젠트리피케이션은 교외화와 더불어 매우 중요한 연구 주제이다. 본 연구는 젠트리피케이션에 대한 논의의 비판적 재고찰을 통하여 향후 연구에 방향을 모색하는데 그 목적이 있다. 이를 위해 젠트리피케이션의 개념, Smith와 Ley를 중심으로 한 공급 측면과 수요 측면의 논의, 그리고 이들 간의 논쟁을 고찰하였다. 또한 최근 연구의 초점이 되고 있는 세계화와 다양한 국가의 젠트리피케이션, 이주와 소셜 믹스(Social Mix), 공간성, 신규 개발 젠트리피케이션 등의 주제를 검토하고, 토대로 역동성 이해, 요인의 복합적 고려, 공간 스케일의 국내 현상에의 적용 측면에서 제시하였다.
본 연구의 목적은 지리교육과정에서 라틴 아메리카 도시 공간 모델에 대한 비판적 고찰과 고등학교 지리교육에의 함의를 제시하는 것이다. 이를 위해 모델 연구에 함께, 세계지리 교육과정에서 소개된 모델의 내용을 분석하였다. 연구는 1970년대부터 시작되어 Griffin and Ford(1980), Crowley(1995), Ford(1996)를 중심으로 발전하였다. 이후, Ford와 Crowley간의 논쟁, 파편화, 다원화되는 최근 연구 경향을 확인하였다. 바탕으로 2007, 2009 개정 교육과정의 교과에서 라틴아메리카 5종 교과서의 분석 결과, Ford 모델(1996)에 적용의 일부 부적절성과 제약 사항이 확인되었다. 토대로 공간을 보다 잘 반영하는 내용구성과 선택이 필요한 것으로 판단된다.
We propose a novel near-eye display optics that supports three-dimensional mutual occlusion. By exploiting the polarization-control properties of phase-only liquid crystal on silicon (LCoS), we achieve real see-through scene masking as well virtual digital imaging using single LCoS. Dynamic depth control mask and image is also achieved by focus tunable lens (FTL) pair opposite curvatures. The proposed configuration LCoS curvature FTL enables self-alignment at arbitrary without distorting...
We propose a novel near-eye display optics that supports three-dimensional mutual occlusion. By exploiting the polarization-control properties of phase-only liquid crystal on silicon (LCoS), we achieve real see-through scene masking as well virtual digital imaging using single LCoS. Dynamic depth control mask and image is also achieved by focus tunable lens (FTL) pair opposite curvatures. The proposed configuration LCoS curvature FTL enables self-alignment at arbitrary without distorting...
동남아시아 도시 공간구조는 고유한 지리적, 역사적 특성으로 인해 서구 도시와 다른 특성을 지녔으며, 이와 관련한 연구들이 수행되었다. 본 연구는 공간구조를 설명하는 모델과 개념을 비판적으로 검토하고, 그 유용성과 가치를 탐색하고자 하였다. 도시구조 McGee의 모델(1967)에 의해 본격화되었으며, Ford의 모델(1993)이 이어졌다. 이후 빠르게 변화되는 동남아시아의 대도시지역을 설명하기 위해 광역 대도시지역 모델(Extended Metropolitan Region: EMR) 모델, 주변부 지역(Peri-urban region), 인터페이스(Peri-urban interface)의 개념이 제시되었다. 특히, 기존 대도시지역의 중심부와 주변 농촌 사이의 점이지역은 데사코타(desakota) 개념으로 설명되었다. 그리고 공간구조 모델에 대한 비판적 고찰을 토대로, 고등학교 지리교육에서의 의미를 탐색하였다. 「세계지리」의 분석 결과, 최근 우리나라와 활발히 교류하고 방문하는...
도농복합시는 1995년 지방자치제가 본격 시행되면서 주민 편의를 증진하고, 도시와 농촌 지역의 균형발전을 목적으로 설치되었다. 본 연구는 우리나라 전체 54개 도농복합시를 대상으로 도시 스프롤 측면에서 도시공간구조를 분석하고자 하였다. 이를 위해 밀도 기반의 측정 지수를 적용하여 2000년, 2010년, 2020년 도농복합시의 스프롤을 인구밀도 및 고용밀도의 탐색하였다. 분석 결과, 인구 스프롤은 전반적으로 증가한 반면, 고용 감소하는 경향을 보였다. 그리고 규모별 차별화되어 진행되었음을 확인하였다.
A real-time incoherent hologram acquisition method is proposed, utilizing liquid crystal based geometric phase switching device. The principle involves recording three phase-shifted interferograms at high speed to create a single complex-valued hologram.
We propose an augmented reality near-eye-display which can present varifocal virtual images with corresponding masks. The mask occludes the real scene behind images, enhancing their visibility.