• 한국정보디스플레이학회:학술대회논문집
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• 한국정보디스플레이학회 2007년도 7th International Meeting on Information Display 제7권2호
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• pp.1803-1806
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• 2007

We have developed a 2D/3D time sequential LCD autostereoscopic display, which is capable of simultaneous displaying 2D and 3D graphics at a frame rate up to 120 Hz. Left and right sets of viewing zones are formed by a combination of a fast LC shutter and a lenticular lens array.

• Transactions on Electrical and Electronic Materials
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• 제18권6호
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• pp.341-344
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• 2017

Infrared (IR) filters were developed to implement integrated three-dimensional (3D) image sensors that are capable of obtaining both color image and depth information at the same time. The combination of light filters applicable to the 3D image sensor is composed of a modified IR cut filter mounted on the objective lens module and on-chip filters such as IR pass filters and color filters. The IR cut filters were fabricated by inorganic $SiO_2/TiO_2$ multilayered thin-film deposition using RF magnetron sputtering. On-chip IR pass filters were synthetized by dissolving various pigments and dyes in organic solvents and by subsequent patterning with photolithography. The fabrication process of the filters is fairly compatible with the complementary metal oxide semiconductor (CMOS) process. Thus, the IR cut filter and IR pass filter combined with conventional color filters are considered successfully applicable to 3D image sensors.

• 디지털산업정보학회논문지
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• 제8권4호
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• pp.159-165
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• 2012

The accurate focusing position should be determined for accurate measurements In VMS. Camera lens focusing is an important problem in computer vision and video measuring systems (VMS) that use CCD cameras and high precision XYZ stages. Camera focusing is a very important step in high precision measurement systems that use computer vision technique. The auto focusing process consists of two steps, the focus value measurement step and the exact focusing position determination step. It is suitable for eliminating high frequency noises with lower processing time and without blurring. An automatic focusing technique is applied to measure a crater with a one-dimensional search algorithm for finding the best focus. Throughout this paper, the suggested algorithm for the Auto focusing was combined with the learning. As a result, it is expected that such a combination would be expanded into the system of recognizing voices in a noisy environment.

• 한국정밀공학회지
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• 제16권4호통권97호
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• pp.19-25
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• 1999

This paper addresses a development work of a SLA apparatus on laboratory basis. The SLA test machine is composed of optical, movement, curing and control subsystems. Optical part is performed by a He-Cd laser with mirror combination and mechanical movement is achieved by X-Y table. The developed system is evaluated by several test runs, and shows a good precision capability in forming a basic part. The technique used in this work can be extended to replace the high technology transfer cost of commercial RP machine.

• 전자공학회논문지D
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• 제35D권12호
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• pp.92-98
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• 1998

본 논문에서는 기준빔의 입사각을 AOD(acoustic-optic device)를 사용하여 전자적으로 제어함으로써 정확한 어드레스와 빠른 엑세스 시간(10㎲)을 갖는 각다중화 고밀도 체적 홀로그래픽 메모리 시스템을 구현하였다. 물체빔의 주파수 보상이 불필요한 AOD 각다중화 메모리 시스템을 설계하고, AOD의 편향각을 렌즈조합으로 확장하여 저장용량을 6배 증가시켜 1㎤의 Fe:LiNbO₃ 광굴절 매질에 51개의 이미지를 저장하는 실험을 수행하였다.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2007년도 하계학술대회 논문집 Vol.8
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• pp.22-23
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• 2007

We tried to find the possibility of mono-crystalline silicon solar cell for photovoltaic concentrating system which is major cost portion for PV system using fresnel lens. With solar simulator and I-V curve tracer, we analyzed maximum output characteristics and measured the temperature of concentrated area using infrared camera. Because of temperature increase, there was no merit when concentrating. But at low radiant power, it showed more efficient operation. The combination of heat-sink technology and tracking system to our concentrating PV system would give better performance results.

• 대한방사성의약품학회지
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• 제6권2호
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• pp.102-115
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• 2020

In the state of Positronium (Ps), which is an unstable material created by the temporary combination of electrons and positrons, the imaging technology through photo-conversion methodology is emerging as a new research theme under resonance conditions through terahertz electromagnetic waves. Normally, Positronium can be observed in the positron emission computed tomography (PET) process when an unstable, separate state that remains after the pair annihilation of an electron and a positron remains. In this study, terahertz (THz) waves and Cherenkov radiation (CR) are generated using the principle of ponderomotive force in the plasma wake-field acceleration, and electrons and positrons are simultaneously generated by using a relativistic electron beam without using a PET device. We confirm the possibility of Positronium photoconversion technology in terahertz electromagnetic resonance conditions through experimental studies that generate an unstable state. Here, a relativistic electron beam (REB) energy of 0.5 MeV (γ=2) was used, and the terahertz wave frequencies is G-band. Meanwhile, a THz wave mode converting three-stepped axicon lens was used to apply the photoconversion technology. Through this, light emission in the form of a luminescence-converted Bessel beam can be verified. In the future, it can be used complementarily with PET in nuclear medicine in the field of medical imaging.

• 만화애니메이션 연구
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• 통권46호
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• pp.181-206
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• 2017

오늘날 일상에서의 인터넷과 스마트폰처럼 가까운 미래에는 현실과 가상이 공존하는 혼합현실 환경 속에서 살 것으로 전망된다. 현재 구체화하고 있는 혼합 현실의 개념을 바탕으로 관련 콘텐츠가 확장되고 있으며, 이에 대한 연구가 더욱 필요한 시점이다. 본 연구는 혼합현실 콘텐츠의 현황과 분석을 통하여 발전방향을 고찰하고자 한다. 혼합현실 콘텐츠 방식은 웨어러블 기기 착용 방식과 기기 착용이 없는 방식으로 나눌 수 있다. 웨어러블 기기 착용 방식의 대표적인 사례인 머리에 착용하는 혼합현실 웨어러블 기기인 홀로렌즈(HoloLens)를 분석하고 기기 착용이 없는 방식의 사례인 텔레프레즌스 아바타로 영상을 합성한 커뮤니케이션 시스템인 룸투룸(Room2Room)을 중심으로 살펴보고자 한다. 혼합현실의 콘텐츠는 현실, 가상현실, 그리고 증강현실의 인터랙티브한 결합을 통한 확장된 정보 활용과 더욱 더 자연스러운 현실감을 구현하는 방향으로 발전될 것이다. 혼합현실 콘텐츠의 발전전망으로써, 머리에 착용하는 웨어러블 기술이 발달함에 따라 편의성과 가격 경쟁력을 확보하면 혼합현실 디바이스 사용자의 확대를 통해 대중화될 것이다. 편의성을 증대하기 위해 웨어러블 혼합현실 디바이스를 통합할 수 있는 방식을 구축하고, 여가 활용 콘텐츠의 다양화를 통해 혼합현실을 기반으로 하는 환경이 조성될 것이다. 텔레프레즌스 아바타는 장소의 한계를 벗어나 언제 어디서나 출현 가능한 혼합현실 콘텐츠로써 모바일 홀로그램 아바타 형태로 발전될 것으로 전망된다. 텔레프레즌스 아바타의 다른 발전가능성은 사용자의 생각대로 움직이는 아바타와 증강휴먼기술과 혼합현실의 결합이다.

• 대한한의학회지
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• 제25권1호
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• pp.161-171
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• 2004

Objectives: Sasang Constitutional Medicine is popularly appliedto treatment in Korea. Constitution is a holistic concept contained internal and external characteristics, and physical traits including ordinary symptoms. Skin is one of constitutional property elements. So we researched a correlation female facial skin and sasang constitution. This is a basic study to find constitution can be a major factor to care and manage skin. Methods: We examined sasang constitution and facial skin condition of 100 healthy women who aged from 30 to 59. Hydration and sebum of facial skin was measured by skin diagnostic instrument and skin type was calculated from the data. Keratin, pore size, acne, and brightness of face was measured by skin magnifying lens and subjective skin troubles in ordinary times was also investigated. Constitution diagnosis and Skin diagnosis was investigated separately as a blind test andthe data was statistically analyzed with chi-square test, Correlation analysis, One-way analysis of variance. Results: 1. In sasang constitution, Taeeumingroup bad significant tendencies of larger hydration and sebum amount, combination degree of forehead and cheek was also higher than other constitutions(p<0.05). 2. Facial skin type was significantly different according to Sasang Constitution, Soeumin and Soyangin had a tendency of dry skin comparatively, but Taeeumin had mainly a tendency of combination skin and secondly dry skin(p<0.05). On the other hand, there was no correlation between age and skin type. 3. In subjective skin trouble, Soeumin group had less acne trouble than Soyangin and Taeeumin group(p<0.1). Pore size trouble was more frequent in Soyangin group than Soeumin group(p<0.05). Keratin trouble was more frequent in Soeumin group than Soyangin and Taeumin group(p<0.1). Conclusions: Korean healthy women's skin condition was different according to sasang constitution.

• Journal of the Optical Society of Korea
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• 제10권3호
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• pp.105-111
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• 2006

A novel image quality evaluation method, which is based on combination of the rigorous grating diffraction theory and the ray-optic method, is proposed. It is applied for design optimization and, tolerance analysis of optical imaging systems implementing diffractive optical elements (DOE). The evaluation method can predict the quality and resolution of the image on the image sensor plane through the optical imaging system. Especially, we can simulate the effect of diffraction efficiencies of DOE in the camera lenses module, which is very effective for predicting different color sense and MTF performance. Using this method, we can effectively determine the fabrication tolerances of diffractive and refractive optical elements such as the variations' in profile thickness, and the shoulder of the DOE, as well as conventional parameters such as decenter and tilt in optical-surface alignments. A DOE-based 2M-resolution camera lens module designed by the optimization process based on the proposed image quality evaluation method shows ${\sim}15%$ MTF improvement compared with a design without such an optimization.