• Proceedings of the Korean Information Science Society Conference
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• 2010.06d
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• pp.196-201
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• 2010

영상보안 시장은 DVR(Digital Video Recorder)을 중심으로 아날로그 시스템을 디지털로 빠르게 대체하며 네트워크를 이용한 고화질 시장으로 발전을 거듭하고 있다. DVR의 핵심적인 기능인 녹화, 검색 기능은 시스템에서 상대적으로 속도가 느린 디스크 자원의 의존도가 높은 기능으로 성능에 직접적인 영향을 미치는 녹화 파일 포맷이 최적화 되지 않을 경우 심각한 성능 문제를 일으킬 수 있다. 본 논문에서는 인덱스를 이용하여 고속 탐색 및 재생 성능을 유지하면서 비디오와 오디오 데이터 외에도 다양한 형태의 이벤트 데이터를 수용하여 DVR의 녹화와 검색 기능의 실제 운용 환경에 적합한 AMS (Advanced Multi-channel Streaming) 파일 포맷을 설계하고 최근 DVR 전용 파일 포맷으로 제안된 ESP 파일 포맷과의 비교 실험을 통하여 기능 및 성능이 향상되었음을 확인 하였다.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2003.05b
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• pp.96-102
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• 2003

Today, stage technology is developing highly by application of digital computer. Performance is composed of audio/video and acoustic technology takes very important position in field of stage technology. Generally speaking, four factors of sound are loudness, pitch, sound timbre and duration. Loudness depends on sound pressure level, yet partly related with spectrum and dulation. Pitch depends mainly on frequence and have a relation with sound pressure and duration. sound timbre depends strongly on spectrum and have a relation with frequence. In this paper, I designed a multi-microphone system which can used in broadcasting and performance stage with vicboss 200MHz-VHF wireless microphone and vicboss 900MHz-VHF wireless microphone. I also studied about multi-microphone which can use conveniently in the super play that needs many microphones. If this multi-microphone is prodused, we could expect better sound quality and a big progress in stereo recording technology.

• Journal of the Korea Safety Management & Science
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• v.6 no.3
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• pp.77-86
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• 2004

Observational methods to evaluate postural load have an intrinsic week point that is the problem of reliability in observing postures subjectively, although they have been widely used in assessing risk factors of work-related musculoskeletal disorders in the industry. In this study, observational reliability was discussed based on reviewing several previous studies. Practical guidelines was presented to reduce the observational errors when using video recording for the assessment of risk factors. In addition, previous studies on observational reliability were summarized and analyzed according to body parts to be observed, media for observation, objective measures, analysis, statistics, etc. It is expected that this basic study can be used to increase the applicability and accuracy of the observational methods.

• Proceedings of the Korean Information Science Society Conference
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• 2003.10c
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• pp.244-246
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• 2003

현재 정부기관이나 은행 등과 같이 침입 탐지의 보안 서비스를 필요로 하는 곳에서는 주로 CCTV(Closed Circuit TV)와 DVR(Digital Video Recording)과 같은 보안 장비들이 사용되고 있다. 하지만 이러한 장비들은 고가이므로 일반 가정이나 소규모 사업장에 이를 도입하는 것은 어렵다. 이에 본 논문에서는 CCTV나 DVR과 같은 고가의 보안 장비를 저렴하게 대체할 수 있는 인터넷 카메라를 이용한 침입탐지 시스템인 IDS(Intrusion Detection System)를 설계 및 구현하였다. IDS는 침입 탐지 보안 시스템이 기본적으로 갖춰야 하는 모니터링, 녹화, 재생. 침입 탐지 등의 기능을 제공할 뿐만 아니라 인터넷을 이용하므로 거리상의 제약점을 극복하였으며, TCP/IP를 이용한 인터넷 카메라를 사용하여 CCTV나 DVR보다 매우 저렴하게 설치 가능하다.

• Journal of The Korean Radiological Technologist Association
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• v.29 no.1
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• pp.25-30
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• 2003

Purpose : The purpose of this study is to present computer-capturing method of dynamic images on fluoroscopic studies, as a substitution for video-recording method, and to help the quantitative analysis of the dynamic studies. Materials and Methods: Compu

• Journal of the Semiconductor & Display Technology
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• v.18 no.3
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• pp.31-35
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• 2019

Human beings have been fascinated by the applicability of the medium of photography since the device was first introduced in the thirteenth century to acquire images by attempting primitive and rudimentary approaches. In the 21st century, it has been developed as a wide range of technology that enables not only the application of artistic expression as a method of replacing the human-hand-painted screen but also the planar recording form in the format of video or image. It is more effective to use the information extracted from the image data rather than to use a randomly given file name in order to provide a variety of services in the offline or online system. When extracting an identifier from a region of an image, high cost cannot be avoided. This paper discusses the image entropy-based approach and proposes a linear methodology to measure the image entropy in an effort to devise a solution to this method.

• Proceedings of the Korean Institute of Interior Design Conference
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• 2002.04a
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• pp.62-65
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• 2002

The purpose of this study was first, to confirm of the key hypothetical concepts through the research of previous literature analysis results, and second, to Identify responses of various prospective consumers on key hypothetical concepts and the validity of the plan for improvement before construction was employed through the small group workshop. The participants in workshop were working housewives with 1 or 2 children, residing in an apartment of a net area of 25.7py. The materials used in the process were questionnaire, existing apartment floor plan, developing floor plan for universal apartment, small scale model, endoscopy images, computer simulation images, and recording equipment like audio recorder, video tape recorder, and camera.

• Proceedings of the Korea Information Processing Society Conference
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• 2014.11a
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• pp.902-904
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• 2014

사람감지를 통한 영상녹화 시스템은 컴퓨터가 입력받은 영상으로부터 사람인 부분을 감지하고 녹화하는 시스템이다. 영상처리를 기반으로 한 사람감지 방법은 그 내용이 비교적 난해하고 학습량이 방대하기 때문에 관련 분야의 입문자들이 직접 구현하기에 어려움이 수반된다. 따라서 이 논문은 초보자들이 해당 분야에 보다 쉽게 접근할 수 있도록 하기 위해 공개 소스 컴퓨터 비전(OpenCV) 라이브러리의 사람 감지 API를 제공한다. 또한, 이를 이용해 웹캠을 통해 입력받은 영상에서 사람인 부분을 표시해주고, 녹화하는 시스템을 구현하였다.

• Electrical & Electronic Materials
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• v.8 no.5
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• pp.633-639
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• 1995

Dropouts in magnetic media are a primary quality deficiency which is detrimental to magnetic signal quality and thus the major impediment to error-free recording, especially in high density digital recorders. The specific form of defects and causes found to be responsible for signal dropouts occurring in magnetic tape were studied. Dropout occurred when the RF signal falls to low level due to the various types of surface defects. However, the fall in the level of the RF signal in gravure roll coated tapes was most often caused by foreign particles adhering to the magnetic tape. It was also shown from the present study that scattered particles trapped under the tape surface or put on the top can lift it as it crosses the head, creating a spherical tent shaped defect and causing a temporary signal drop. Dropout producing substances were identified through optical and microchemical analyses. The results were correlated with measured electrical signal losses combined with analytical microscopy to clarify source identification of defects.

• Korean Journal of Applied Biomechanics
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• v.13 no.2
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• pp.29-47
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• 2003

This study is to analyze the kinematic variables in release motion of discuss throwing. For the matter, 5 people from the national team and collegiate discuss throwing in the year 2001 were chosen as the subjects and two S-VHS video cameras set in 60frames/sec were used for recording their motions. Coordinated raw positions data through digitizing are smoothing by butter-worth 's low-pass filtering method at a cut off frequency 6.0Hz. and the direct linear transformation(DLT) method was employed to obtain 3-D position coordinates. The conclusions were as follows; 1. The better record players showed the shorter approach time in the last support phase. 2. In the displacement CG, the better record players showed the shorter displacement in medial-lateral direction, and the longer displacement in horizontal direction. In the motion, the COG showed longer displacement vertical direction. 3. The better record players showed the faster horizontal velocity than vertical velocity in the release. 4. The better record players showed to take the posture of vertical axis in the release.