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공간증강현실 구현을 위한 적외선 센서 기반 동적 물체 정밀 추적 시스템
오지수(JiSoo Oh),박진호(Jinho Park) 한국컴퓨터그래픽스학회 2017 컴퓨터그래픽스학회논문지 Vol.23 No.3
4 차 산업혁명 시대로 접어들면서 증강현실은 사회 전반에 걸쳐 무한한 가능성을 보여주고 있다. 하지만 현재의 헤드-마운트 디스플레이, 핸드-헬드 디스플레이 방식의 증강현실은 착용의 번거로움, 멀미 등의 여러 문제점이 있고 이에 따라 프로젝터 기반의 증강현실 기술인 공간증강현실이 각광받고 있다. 공간증강현실은 증강현실의 실재감을 높이고 사용자의 몰입을 유도하기 위해 가상 영상을 투영할 움직이는 물체에 대한 정밀한 추적이 필수적이다. 본 논문에서 개발한 적외선 센서 기반의 정밀 추적 알고리즘은 평균 오차율 1.5% 이내의 매우 견고한 추적 성능을 통해 기술적으로는 임의의 물체에 대한 추적과 같은 진보된 증강현실 기술을 향한 길을 열었고, 사회적으로는 비전문가도 사용하기 쉬운 추적 알고리즘을 통해 디자이너, 학생, 어린이들이 쉽게 자신만의 증강현실 콘텐츠를 제작, 즐길 수 있게 하였다. As the era of the fourth industrial revolution began, augmented reality showed infinite possibilities throughout society. However, current augmented reality systems such as head-mount display and hand-held display systems suffer from various problems such as weariness and nausea, and thus space-augmented reality, which is a projector-based augmented reality technology, is attracting attention. Spacial augmented reality requires precise tracking of dynamic objects to project virtual images in order to increase realism of augmented reality and induce user’s immersion. The infrared sensor-based precision tracking algorithm developed in this paper demonstrates very robust tracking performance with an average error rate of less than 1.5% and technically opens the way towards advanced augmented reality technologies such as tracking for arbitrary objects, and Socially, by easy-to-use tracking algorithms for non-specialists, it allows designers, students, and children to easily create and enjoy their own augmented reality content.
( Jisoo Park ),( Eun-kyung Kim ),( Mi-ae Kim ),( Tae-hyung Kim ),( Jung Hyun Chang ),( Yon Ju Ryu ),( Sei Won Lee ),( Yeon-mok Oh ),( Suk Joong Yong ),( Won-il Choi ),( Kwang Ha Yoo ),( Ji-hyun Lee ) 대한결핵 및 호흡기학회 2018 Tuberculosis and Respiratory Diseases Vol.81 No.4
Background: Obstructive airway disease patients with increased variability of airflow and incompletely reversible airflow obstruction are often categorized as having asthma-chronic obstructive pulmonary disease (COPD) overlap syndrome (ACOS). ACOS is heterogeneous with two sub-phenotypes: asthma-ACOS and COPD-ACOS. The objective of this study was to determine the difference in risk of exacerbation between the two sub-phenotypes of ACOS. Methods: A total of 223 patients exhibiting incompletely reversible airflow obstruction with increased variability (spirometrically defined ACOS) were enrolled. These patients were divided into asthma-ACOS and COPD-ACOS according to their physician’s diagnosis and smoking history of 10 pack-years. Within-group comparisons were made for asthma-ACOS versus COPD-ACOS and light smokers versus heavy smokers. Results: Compared to patients with COPD-ACOS, patients with asthma-ACOS experienced exacerbation more often despite their younger age, history of light smoking, and better lung function. While the light-smoking group showed better lung function, they made unscheduled outpatient clinic visits more frequently. On multivariate analysis, asthma-ACOS and poor inhaler compliance were significantly associated with more than two unscheduled clinic visits during the previous year. Conclusion: Spirometrically defined ACOS includes heterogeneous subgroups with different clinical features. Phenotyping of ACOS by physician’s diagnosis could be significant in predicting future risk of exacerbation.
Oh, Hyeju,Kang, Jisoo,Kang, Seon-Young,Choi, Keeyoung,Lee, Hak-Tae,Jung, Hyuntae,Moon, Woo-Choon The Korean Society for Aeronautical and Space Scie 2016 International Journal of Aeronautical and Space Sc Vol.17 No.4
In this paper, Human-in-the-Loop (HiTL) simulations of Remotely Piloted Aircraft System (RPAS) operations in two different Air Traffic Management (ATM) concepts, conventional radar vectoring and Trajectory Based Operations (TBO), were performed to assess the impacts of RPAS integration in the future ATM environment. TBO concept maximizes the throughput by planning and sharing 4-D trajectories between pilots and controllers, and it is considered one of the key concepts to enable RPASs to operate with manned aircraft in congested airspaces. RPASs are characterized by having communication delay or temporary loss of communication. TBO capability was added to the integrated air traffic simulation system for this study, which was developed in the Inha University. HiTL simulations were performed by a trainee air traffic controller with three scenarios, and the data were analyzed using safety, efficiency, and controller workload metrics. The results suggest that TBO were effective in reducing delays and controller workload while maintaining the level of safety.
Performance of thyristor memory device formed by a wet etching process
Yoo, Jisoo,Oh, Gyujin,Kim, Min-Won,Song, Seung-Hyun,Yoo, Sang-Dong,Shim, Tae-Hun,Kim, Eun Kyu IOP 2019 Nanotechnology Vol.30 No.3
<P>Thyristor random access memory without a capacitor has been highlighted for its significant potential to replace current dynamic random access memory. We fabricated a two-terminal (2-T) thyristor by wet chemical etching techniques on n<SUP>+</SUP>–p–n–p<SUP>+</SUP> silicon epitaxial layers, which have the proper thicknesses and carrier concentrations, as provided by technology computer-aided design simulation. The etched features such as etch rate, surface roughness, and morphologies, in a potassium hydroxide (KOH) and an isotropic etchant, were compared. The type of silicon etchant strongly affected the etched shapes of the side wall and therefore critically influenced the device performance with varying turn-on voltages. The turn-on voltage of thyristor fabricated with a KOH solution showed a consistent tendency of operation voltage in the range of 2.2–2.5 V regardless of the cell size, while the thyristor formulated with isotropic etchant had an operation voltage which increased from about 2.3–4.4 V as the device dimension decreased from 200 <I>μ</I>m to 10 <I>μ</I>m. The optimized 2-T thyristor showed a memory window of about 2 V, a nearly zero-subthreshold swing, and a current on-off ratio of about 10<SUP>4</SUP>–10<SUP>5</SUP>.</P>