• International Journal of Advanced Culture Technology
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• 제10권4호
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• pp.460-469
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• 2022

Increasing interest in the metaverse world these days, interest in realistic content such as 3D displays is growing. In particular, hologram images seen in movies provide viewers with an immersive display that cannot be seen in conventional 2D images. Since the first discovery of holography by Dennis Gabor in 1948, this technology has developed rapidly. Spatially, this beginning of technology like Optical hologram called analog hologram and Digital hologram such as computer-generated hologram (CGH). In analog and digital holograms, a recording angle and a recording wavelength are having important role when reproducing and display hologram. In the hologram, diffraction of light causes by unexpected formed by the synthesis from interference with object and reference light. When recording, the incident light information and mismatched reproduction light reconstruct the hologram in an undesirable direction. Reproduction light that is out of sync with incident light information with initial condition of recording will cause reconstructed image in an undesirable direction. Therefore, we analyze the holographic interference pattern generated by hologram recording in volume holograms using photopolymer and analyze the characteristics that vary depending on the angle of the reproduced light. This is expected to be used as a basic research on various holographic application that may cause as holograms are applied to industries in the future.

• 한국항행학회논문지
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• 제17권2호
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• pp.234-239
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• 2013

기존의 어학시스템 콘텐츠의 문제점은 수업에 대한 집중력 저하와 실제 학습여부를 판단할 수 없었고, 수업 진행자의 평가로 많은 결정이 되었다. 이로 인해 음성녹음 기반에 유비쿼터스 기술과 가상현실 기술을 조합하여 강의실에 프로젝터를 설치하고 각 강의실의 RFID 리더기 부착과 학생의 RFID 태그 부착된 학생증을 통해 영어 등급에 해당하는 콘텐츠를 학습한다. 3차원 영상 콘텐츠로 가상 현실상의 외국인과의 질의응답을 음성녹음 기술을 이용하여 발음과 억양을 동시에 체크 하여 레벨 패스 또는 레벨 실패를 판가름 한다. 이렇게 구성된 시스템은 학생 교육 데이터를 중앙 서버에 DB로 저장후 피드백 과정을 통해 정보를 제공하게 된다. 본 연구로 어학 콘텐츠에서 공통적으로 가질 수 있는 문제점들을 분석하고 문제점에 대하여 음성 녹음기술을 적용하여 기존의 어학콘텐츠에서 해결하지 못했던 문제점을 해결하였고 레벨위주의 수업이 가능하였다. 또한, 흥미위주의 적극적인 수업참여가 되도록 기여하였다.

• International Journal of Advanced Culture Technology
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• 제10권4호
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• pp.478-486
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• 2022

Holography is a human-friendly technology that can express 3D stereoscopic information without eye fatigue. You can experience the mysterious features of light directly and indirectly, and you can also experience the principles of 3D imaging, which makes it a very good curriculum. As such, although holography is very effective in teaching students optics and 3D imaging technology, it has not yet been systematically established. The reason is the cost burden such as expensive equipment and laboratories, and the lack of easily accessible educational equipment. We implemented a portable holographic recording system to solve this problem. In addition, since silver halides, which use harmful chemicals, are not used in the process of developing the recording medium, and photopolymers are used, it is possible to educate not only the general public but also young students. In order to improve the completeness of the recorded result, the mechanism part, light source, and recording medium part of the production system were newly constructed to complement all the existing problems. The proposed system will make holography easily accessible to many people in a variety of fields, not just education. Through the interesting experience of various features and principles of light and the production of holograms with high satisfaction, we hope to popularize them in various fields such as education.

• 한국멀티미디어학회논문지
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• 제15권10호
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• pp.1185-1195
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• 2012

모바일 방송 단말기의 일반적인 녹화 방법은 대상 콘텐츠의 내용과 관계없이 녹화 시작 및 종료 시점까지의 모든 수신 데이터를 저장하게 되는데, 이러한 경우 콘텐츠 중간에 삽입되는 광고 등 시청자가 원하지 않는 콘텐츠도 같이 녹화되는 현상이 발생하게 된다. 이러한 문제를 해결하기 위하여, 본 논문에서는 녹화 대상 방송 스트림에서 광고 등이 삽입되어 MPEG-2 (Moving Picture Expert Group-2) TS (Transport Stream) 패킷 스트림의 단절이 발생하는지를 파악한 후, 단절이 발생할 경우에는 그 시점을 예측하여 이를 녹화 과정에 적용하는 끊김 없는 (seamless) 녹화 방법을 제안한다. 제안한 끊김 없는 녹화 방법에서는 먼저 TS 패킷 확장 헤더인 적응 필드 (adaptation field)의 관련 플래그 (flag)를 통해 스트림의 단절 유무를 파악한 후, 단절이 발생할 것으로 판단된 경우에는 적응 필드의 splice_countdown값을 분석하여 단절 시점을 예측한다. 이와 같이 TS 스트림의 단절 시점을 파악한 후 단절 이후의 TS 스트림은 저장하지 않고 광고 등이 종료되어 다시 원 TS 스트림으로 복귀한 이후의 데이터를 저장함으로써, 콘텐츠의 내용이 끊기지 않는 녹화 콘텐츠를 제공할 수 있다. 기존의 모바일 방송 단말기의 소프트웨어를 일부 수정하여 실시한 모의실험을 통해 제안한 끊김 없는 녹화 방법의 우수성을 확인하였다.

• PNF and Movement
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• 제10권3호
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• pp.33-38
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• 2012

Purpose : The purpose of this study was to record, analyze and describe in detail, content of PNF intervention for recovery of function after stroke using SPIRIT intervention recording tools. Methods : A convenience sample of 21 physical therapist from a rehabilitation hospital recorded the intervention for 69 patients with stroke who treated during 30 minutes. The content of the treatment sessions was recorded using the Stroke Physiotherapy Intervention Recording Tool(SPIRIT). Descriptive statistics assessed for describe the intervention. Results : A convenience sample of 21 physical therapist from a rehabilitation recorded the interventions for 64 patients with stroke who treated during 30 minutes. The content of the treatment sessions was recorded using the Stroke Physiotherapy Intervention Recording Tool(SPIRIT). Descriptive statistics assessed for describe the interventions accurately and investigate the difference according to time since stroke. Conclusion : Facilitation techniques were the most frequently used intervention(n=1226,35.6%), practice(n=967, 28.0%) and exercise(n-670, 19.4%) in clinical practice of physical therapist. In contrast, Teaching careers and health care professionals to do or assist category is not frequently used intervention(n=5, 0.1%). Therefore, We need to be careful again with category of teaching careers and health care professionals.

• 정보저장시스템학회논문집
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• 제3권4호
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• pp.173-177
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• 2007

A photo-reactive methacrylate monomer having triazine as a core component was examined for photochromic diffractive image formation. Photochromic photopolymer films as a recording media contained a monomer mixture of triazine difunctional metharylate (DT) and ethylene glycol phenyl ether acrylate, binder polymer, photo initiator, and a photochromic spiro-oxazine dye. The content of photochromic dye was changed to examine the effect of photochromophore on diffraction efficiency and real holographic image formation. Holographic recording was performed on the photopolymer film by the combination of reference and probe beam. The diffraction efficiency of the photopolymer film in real-time measurement reached a maximum of $\sim90%$ within 30s. It was highly dependent on the photochromophore contents. After holographic recording, the color of the recorded area was changed under UV light (365 nm) and reversibly bleached to original color upon exposure to a visible light source. Films containing only photochromophore without monomer mixture were not reactive under the recording beam (491nm). Diffractive image formation and mechanism of the holographic recording in the presence of photochromophore will be presented.

• 정보과학회 컴퓨팅의 실제 논문지
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• 제24권1호
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• pp.33-39
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• 2018

현재 국방시뮬레이션 분야에서 통합시험을 위해 각각의 실 장비 및 모의기(Simulator)들 자체 로깅정보는 자동화가 되어있다. 통합시험시스템의 특이사항은 시험일지로 작성하고 있지만, 자동화가 되어 있지 않아 여전히 운용자의 수기작성 또는 파일작성에 의존하고 있어, 기록 내용 부실 및 동일 내용 반복작성 등 비효율적인 면이 존재한다. 본 논문에서는 이러한 문제점들을 해결하기 위해 자동 시험일지 기록 프로그램을 제안하고자 한다. 자동 시험일지 기록프로그램은 프레임워크 기반 기술을 활용해 시험일지에 기록해야 할 정보를 운용통제컴퓨터와 운용자로부터 수신 받아 일지를 기록해준다. 자동 시험일지 기록프로그램이 운용자의 반복적인 시험내용을 안정적으로 기록할 수 있게 한다. 또한, 시험 운용인원이 제한적이어도 운용자가 통합시험에만 집중할 수 있도록 효율성을 높여주었다.

• 방송공학회논문지
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• 제24권7호
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• pp.1189-1198
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• 2019

The study explores the effects of recording and viewing distances in stereoscopic 3D on presence, perceptual characteristics, and negative experiences. Groups of 20 participants were randomly assigned to each of the three viewing distances, and all participants were exposed to five versions of the stereoscopic 3D music video that differs in recording distance. The results showed that first, viewers felt a higher experience of presence and had a better perception of objects positioned near the cameras. Second, viewers felt a greater perception of screen transmission as the viewing distance increased. Finally, viewers felt a greater negative experiences due to the joint effects of recording and viewing distance. As investigating the influence of stereoscopic 3D content and viewing environments on psychological factors, the study expects to provide a guideline of human factors in 3D.

• 한국정보통신학회:학술대회논문집
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• 한국해양정보통신학회 2003년도 추계종합학술대회
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• pp.963-966
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• 2003

방송 환경이 디지털화되면서 기존 방송 단말에서 지원하던 방송 프로그램 녹화 기능이 새로운 저작권 문제를 불러일으키고 있다. 그러나 방송 단말에 저장되는 방송 콘텐츠를 위한 적절한 보호방안이 마련된다면, 이러한 콘텐츠를 이용한 새로운 비즈니스 모델을 창출해 낼 수 있다. 본 논문에서는 방송 단말에 저장된 콘텐츠를 효과적으로 보호하고 이를 이용한 콘텐츠 유통을 지원할 수 있으며 기존의 방송 서비스 환경에 쉽게 적용될 수 있는 디지털 콘텐츠 보호 방법에 대하여 논한다.

• 한국직업건강간호학회지
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• 제10권1호
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• pp.74-92
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• 2001

This study was carried out to investigate the types of health documents for nurses, the content of informations in the documents, and writing behaviors of occupational health nurses. Health documents were collected from 7 nurses who were working in 7 group occupational health agencies (GOHA) located at Seoul and Inchon area in Korea. The collected health documents written in January to June 1999 were analyzed, and revealed the following results. 1) The occupational health nurses were using 9 to 18 different types of health documents. The contents of the documents were considered quite similar to each other with slightly different headings and items to record. Among different types of health documents. Health Management Card for Workplace', Nursing performance sheet and Workplace environmental checklist were in common among nurses and were used for content analysis. 2) The 'Health Management Card for Workplace' was the only formal sheet of small-scale-enterprises (SSE) for health management, in which health and safety related information was recorded. The information on nursing services were recorded on the Nursing performance sheet, which has slightly different names on each type with similar contents. The Workplace environment checklist was for the information on general work environment management and mainly status of workplace hygiene. This checklist is to be used by or with nurses among the 3 types health professional team such as doctor, hygienist, and nurse, but it seemed not being used frequently by nurses. 3) Analysis on recording tendencies of nurses revealed that the writing styles of occupational health nurses were associated with 'memo' using a few number of words and short sentences. The amount of information by this kind of recording style was considered not enough for health management situation. The possible reasons for nurses to use this writing style might be insufficient time for recording and improper designed format of health documents. Because nurses working in SSE spend more time on the roads to visit workplaces, nurses may not found enough time for recording properly within their working time. In addition, the health records were designed to focus on the frequency of nurse's performance in certain types of work rather than on the method they used to deal with health problems. In conclusion, this study suggests that some steps are necessary to develop health documents and recording system which is appropriate to occupational health nurses. The educational need for nurses on appropriate recording behavior is also recommended.