• Electronics and Telecommunications Trends
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• v.29 no.3
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• pp.17-26
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• 2014

방송의 디지털 전환 완료 후, 세계 각국은 3DTV 및 UHDTV(Ultra High Definition Television)로 대표되는 실감방송서비스 및 기술개발에 박차를 가하고 있다. 특히 3DTV의 경우, 현재 시판되고 있는 평면TV의 필수기능으로 포함되어 있으며, 우리나라를 비롯한 선진 각국에서는 상용 3DTV 방송서비스가 제공되고 있다. 또한, UHDTV의 등장으로 무안경 다시점 3DTV의 걸림돌이던 해상도 저하문제가 해결되면서 시점당 해상도가 향상된 다시점 3D 디스플레이 상용품 및 시제품들이 속속 발표되고 있다. 이에 따라, 무안경 다시점 3DTV 방송 서비스도 가시화 될 것으로 보며, 이를 위해서는 다시점 디스플레이뿐만 아니라 다시점 비디오 부호화 등의 표준기술이 필요하다. 본고에서는 무안경 다시점 3DTV 기술의 핵심이 되는 디스플레이 기술과 다시점 3D 비디오 부복호화 기술을 중심으로 알아본다.

• Journal of Korea Multimedia Society
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• v.15 no.3
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• pp.323-335
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• 2012

In this paper, we propose an AR(augmented reality) system using user's bare hand based on computer vision. It is important for registering a virtual object on the real input image to detect and track correct feature points. The AR systems with markers are stable but they can not register the virtual object on an acquired image when the marker goes out of a range of the camera. There is a tendency to give users inconvenient environment which is limited to control a virtual object. On the other hand, our system detects fingertips as fiducial features using adaptive ellipse fitting method considering the geometric characteristics of hand. It registers the virtual object stably by getting movement of fingertips with determining the shortest distance from a palm center. We verified that the accuracy of fingertip detection over 82.0% and fingertip ordering and tracking have just 1.8% and 2.0% errors for each step. We proved that this system can replace the marker system by tacking a camera projection matrix effectively in the view of stable augmentation of virtual object.

• Journal of the Economic Geographical Society of Korea
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• v.5 no.1
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• pp.69-87
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• 2002

This study examines the spatial diffusion and locational charateristics of convenience stores in Daegu which had increased rapidly in the 1990s. The first convenience store (CVS) was introduced in the zone of transition of (Namgu district) adjacent to the city center or CBD in 1992. Thereafter they diffused into CBD and residential areas, but they have centered around places where their steady purchasing population was distributed. As a result, the spatial distribution of CVSs in Daegu shows a very uneven pattern concentrated in areas with many high school, in commercial and business areas, and apartment residential areas. It seems that this pattern is derived from two basic locational factors. Primarily, the location of CVSs in Daegu is very closely related with the spatial distribution of the demand population which will be clients for CVSs. Secondarily, it is also affected by the accessibility of streets which the demand population utilizes easily.

• The Proceeding of the Korean Institute of Electromagnetic Engineering and Science
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• v.19 no.4
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• pp.15-32
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• 2008

본 연구는 미래 네트워크 중심전의 핵심으로 등장하고 있는 군용 정보 통신 체계 및 구성 장비의 특성과 발전 동향을 소개하는 차원에서 분석 제시한다. 1장에서는 네트워크 중심전이 태동하게 된 배경을 살펴보았고, 2장에서는 미래 네트워크 중심전의 핵심 전력인 군 전술 정보 통신 체계의 국내외 발전 동향에 대해 분석하였다. 3장에서 군용 정보 통신 체계를 구성하는 정보 통신 장비의 종류 및 기술의 발전 추세를 분석하여 제시한 후, 4장에서 미래전에 대한 시사점을 결론적인 차원에서 제시하였다.

• The Journal of the Acoustical Society of Korea
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• v.17 no.4
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• pp.72-75
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• 1998

본 논문에서는 기존에 제시된 수정된 K-평균 방법을 이용한 VQ 학습 알고리즘을 분석하고, 보다 개선된 성능을 보이는 학습 알고리즘을 제안한다. 수정된 K-평균 학습 알고 리즘은 자기 집단에 속하는 데이터의 중심을 데이터의 중심을 새로운 코드워드로 삼는 것이 아니라 현재 코드워드와 새로 구한 집단의 중심을 연결한 선상에서 새로 구한 중심 너머의 일정한 점을 새로운 코드워드로 선택하는 방식이다. 본 논문에서는 이렇게 구한 새로운 코 드워드가 어떠한 조건을 만족할 때 알고리즘이 반복적 감소의 성질을 가지는지 살펴보고, 그 조건을 만족시키는 영역 중 기존의 방식보다 더 좋은 성능을 보이는 코드워드 선택법을 제시함으로써 개선된 학습 알고리즘을 제안한다.

• The korean journal of orthodontics
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• v.32 no.1 s.90
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• pp.59-69
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• 2002

The purpose of this study was to evaluate the reproducibility of lateral cephalometric landmarks according to radiographic image enhancement, and to contribute to the identification of cephalometric landmarks. Lateral cephalograms of ten individuals were taken and stored into computer. The images were then enhanced up to four grades by Quick Ceph Image Pro$^{TM}$ on condition that the gray-scale equalization number was 50 and the detail enhancement number was 50. After thirty two landmarks were identified on monitor images by five observers, the deviations from the mean, the distances estimated between identified points and the mean point of five identified points, were evaluated for each landmark at each enhancement grade. Through the statistical analysis, following results were obtained. 1. In case of unenhanced radiographic images, the inter-observer reproducibility of the landmarks showed a large variation. 2. The comparison of deviation from the mean according to the degree of radiographic image enhancement for each landmark showed that the inter-observer reproducibility was significantly different at 5 landmarks. 3. The landmark of pterygomaxillary fissure showed higher reproducibility at enhancement grade 1 and 2 images than at unenhanced images. So did the landmark of posterior nasal spine at enhancement grade 1 images, and the landmark of menton at enhancement grade 2, 3 and 4 images respectively. The above results suggest that the reproducibility of some landmarks can be increased by radiographic image enhancement during the identification of the lateral cephalometric landmarks on the monitor.

• Progress in Medical Physics
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• v.13 no.3
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• pp.135-138
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• 2002

Fractionated stereotactic radiosurguy (FSRS) requires precise and reproducible patient set up. For these reasons non-invasive mask fixation methods have been used in Linac based FSRS. In this study, we measured and assessed the isocenter reproducibility using a commercial head mask fixation system based on thermoplastic materials. For the verification and the measurement of isocenter deviation a special acrylic brain phantom was designed. The designed phantom has 22 vertical rods and each rod has different lengths. At the end of the 8 rods, the monochromic film is attached and irradiated due to planned target position. Deviations of isocenter were measured separately for each direction. The mean deviation showed 0.4 mm in longitudinal direction, 0.1 mm in the lateral direction, 0.1 mm in the anterior-posterior direction of the treatment couch. The data demonstrates the high accuracy and reproducibility. This study reinforces previous literature published.

• KOREAN POULTRY JOURNAL
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• v.33 no.5 s.379
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• pp.64-69
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• 2001

최근 백화점, 할인점, 대형 마트 등의 대형 매장이 하루가 다르게 늘어나고 있다. 특히 대형 할인점은 국내기업과 외국기업간에 시장 점유율을 높이기 위하여 매장을 계속하여 늘려 가고 있고, 이에 따라 인근 중소형 마트 매장은 경쟁력을 상실하고 폐업하는 사태가 속출하고 있다. 이러한 유통시장 변화는 계란유통도 변화를 가져오리라 보는데 대형 할인매장 중심으로 계란유통현황을 살펴보았다.

• KOREAN POULTRY JOURNAL
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• v.36 no.5 s.415
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• pp.108-110
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• 2004

사료가격 인상. 외국산 축산물의 유입. 힘들게 생산해도 판로가 없다. 우리나라의 현실이다. 일본 역시, 사료원료의 수입과 외국산 농축산물이 수입 그리고 경기침체로 인한 소비부진, 저난가 사료가격 인상이라는 공통점을 가지고 있는 일본 산란계 농가의 현황을 알고 싶어서 농장에 체류하면서 일본 산란계 농장을 경험하였다. 필자가 방문한 곳은 고상식계사로 250,000수 수용이 가능하고 자체 GP시설을 가동하면서 판매점으로 직판하는 곳이었다.

• Journal of the Korean Geographical Society
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• v.40 no.5 s.110
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• pp.491-513
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• 2005

The Republic of Korea is planning to build the now Multi-functional Administrative city (NMAC). The purpose of this paper is to suggest the conceptual framework for this new city that relies on the Korean geomancy, oriental viewpoint on man and nature relationship, particularly in Korea. According to the Geomancy which could conceptualize the human-environment relationship in the site, the overall landscape image of the city could be symbolized by two flying crane with three Taegueks. In transforming the overall landscape image to urban form, two diamonds which means eternity and strength arises from the western spatial viewpoint, as means to protect and harmonize the human, land and mountain relationship in this site and the symbolic meaning of this site as generative and sacred place in Korean people's mind. On the one hand, through juxtaposing of the two diamonds a geometric structure shows up, on the other hand the main axis of the city could be established from two crane and three Taegueks. On the North-South axis from the core of the symbolic green axis, symbolic things will be located, and the administrative offices will be Placed on the East-West axis. Peripherals of the central axis also play a role in developing overall land use from image. The buildings and residents could be arranged and located according to undulations and this is based on the oriental theory of geomancy. We can build cultural amenities on the head part of the crane and on the core area.