• Journal of the Korean Institute of Telematics and Electronics S
• /
• v.35S no.9
• /
• pp.95-103
• /
• 1998

This paper proposes an image segmentation algorithm based on fusion of range and intensity images. Based on Bayesian theory, a priori knowledge is encoded by the Markov random field (MRF). A maximum a posteriori (MAP) estimator is constructed using the features extracted from range and intensity images. Objects are approximated by local planar surfaces in range images, and the parametric space is constructed with the surface parameters estimated pixelwise. In intensity images the ${\alpha}$-trimmed variance constructs the intensity feature. An image is segmented by optimizing the MAP estimator that is constructed using a likelihood function based on edge information. Computer simulation results shw that the proposed fusion algorithm effectively segments the images independentl of shadow, noise, and light-blurring.

• The Journal of the Acoustical Society of Korea
• /
• v.22 no.1
• /
• pp.78-87
• /
• 2003

High-frequency (126-㎑) bottom backscattering measurements with various bottom types were conducted at the water tank in Ocean Acoustic Laboratory, Hanyang University. For the purpose of investigating the energy distribution of bottom scattering with various bottom types, the sediment was varied with gravel, sand, sandy mud and mixed bottoms. To examine the anisotropic nature of the scattering due to the orientations of bottom ripple, the footprints were made transverse and longitudinal to the direction of incident wave. The total scattering characteristics are that the larger grazing angles the larger backscattering strengths become and backscattering strengths for a transverse ripple case are higher than those of longitudinal ripple case. finally, the variations of scattering strength depend mainly on the ripple's orientation.

• Archives of design research
• /
• v.11
• /
• pp.72-81
• /
• 1995

The purpose of this study was investigate the consistency of Korean traditional space in apartment. Fifty-two apartments and its dwellers were selected for field survey research and questionnaire. The major findings were summarized as follows: First, the space layout which has its origin in Korean traditional house was found in contemporary apartment and favored than that of western apartment. Second, among the Korean traditional space characteristics, the openness and closeness were found between the living room and room, living room and dining room, dining room and kitchen. Third, the heating system has been being changed from radiator to on-dol. Also favored finishing materials were revealed on-dol wood flooring and picture window for the living room, jang-pan flooring and Korean lattice window for the master room, wall covering for every wall and ceiling.

• Journal of Korean Society for Geospatial Information Science
• /
• v.19 no.1
• /
• pp.97-103
• /
• 2011

LiDAR system has become a popular tool for generating 3D surface data such as Digital Surface Model. Extraction of valuable information, such as digital building models, from LiDAR data has been an attractive research subject. This research addresses to extract planar patches from LiDAR data. Planar patches are important primitives consisting of man-made objects such as buildings. In order to determine the best fitted planes, this research proposed a method to reduce/eliminate the impact of the outliers and the intersection areas of two planes. After finishing plane fitting, planar patches are segmented by pseudo color values which are calculated by determined three plane parameters for each LiDAR point. In addition, a segmentation procedure is conducted using the pseudo color values to find planar patches. This paper evaluates the feasibility of the proposed method using both airborne and terrestrial LiDAR data.

• Journal of IKEEE
• /
• v.26 no.3
• /
• pp.445-455
• /
• 2022

This paper presents the optimal design of flyback transformer with the flat copper winding method of injection type suitable for the small-size and winding method of automatic type used in 90W DC to DC converter for LED-TV. This paper also proposes the flyback transformer with the flat copper winding method of injection type capable of the winding method of automatic type and the reduction of transformer size and enhanced uniformity in electrical characteristics compared to the conventional mass-production flyback transformer with the winding method of manual type. In particular, the flat copper winding transformer of injection type proposed in this paper is constructed in a vertical winding method of its transformer to realize the winding method of automatic type. The primary and secondary windings of flyback transformer with the flat copper winding method of injection type used the conventional winding, triple insulated winding and the flat copper winding method of injection type, respectively. The optimal design of flyback transformer with the flat copper winding transformer of injection type proposed in this paper suitable for small-size and winding method of automatic type was carried out based on the simulation results using Maxwell 2D and 3D tool.

• Journal of the Korean Society of Radiology
• /
• v.16 no.2
• /
• pp.157-162
• /
• 2022

Since preclinical positron emission tomography imaging is performed on small animals that are very small compared to the human body, a detector with excellent spatial resolution is required. For this purpose, a system was constructed using a detector using small scintillation pixels. Since the size of the currently developed and used photosensors is limited, excellent spatial resolution can be obtained when the minimum scintillation pixel and maximum array are used. In this study, the size of the photosensor is fixed and various scintillation pixel arrays are configured to match the size of the scintillation pixels, so that no overlap occurs in the flood image and the maximum scintillation pixel array in which all scintillation pixels are distinguished. For this purpose, DETECT2000, which can simulate a detector module composed of a scintillator and an photosensor, was used. A photosensor consisting of a 4 × 4 array of 3 mm × 3 mm pixels was used, and the scintillation pixel array was configured from 8 × 8 to 13 × 13, and simulations were performed. A flood image was constructed using the data obtained from the photosensor pixel, and the maximum scintillation pixel array that does not overlap the image was found through the flood image and the profile. As a result, the size of the scintillation pixel array in which all scintillation pixels are imaged without overlapping each other in the flood image was 11 × 11.

• Land and Housing Review
• /
• v.12 no.3
• /
• pp.67-78
• /
• 2021

After World War II, modular housing was developed as a means of quickly and efficiently meeting the housing supply demand. For the past 30 plus years, efforts have been made to improve modular housing in South Korea and to increase their competitiveness in the housing market. This study investigated modular houses based on a steel framed rahem structure which provides a flexible floor plan where walls are easily reconfigured to create rooms of various sizes and functions. Similar to the factory production methods used in the automotive industry, the modular housing industry can also benefit by standardizing such aspects as building components, manufacturing and construction methods, materials, process management, and floor plans. This study examined the feasibility of using a 3m × 3m module for developing various floor plans which are easy to produce and transport. Each 3m × 3m module can be configured to meet different living needs resulting in a complete home when multiple modules are connected. The module configurations can be varied to meet ground transportation and crane limitations. This study found that a 3m × 3m steel framed modular unit is a promising step towards providing residents with plans that meet their living preferences while improving and increasing the supply of modular houses.

• Korean Institute of Interior Design Journal
• /
• no.36
• /
• pp.52-59
• /
• 2003

A guest room section is the most important part of the hotel design. It contributes not only to the marketing but also to the effective distribution of the floor plan. This study is to provide the trends of the plan type of the guest rooms at the luxury resort hotels in Jeju-do through analyzing the typical floor plan type and surveying the area distribution of the guest room section. The purpose of the study is to provide the basic materials for the improvement of the quality of hotel guest rooms in Jeju-do, which is emerging as the international tourism destination of 21C. Here, we make the 13 luxury resort hotels in Jeju-do an subject of the study. They are divided into three grades by the size, quality, and the service.

• 한국HCI학회:학술대회논문집
• /
• 2006.02a
• /
• pp.317-324
• /
• 2006

디지털방송의 애플리케이션(Xlet)은 시청자와 방송프로그램간의 상호작용에 중요한 역할을 담당한다. 현재 이러한 애플리케이션 UI는 평면이미지로 구성하는 것이 대부분이며 화면상 영역은 2차원으로 제한된다. 본 논문은 이러한 2차원의 평면적인 느낌을 극복하고 3차원이 가진 다양한 이점을 살리기 위한 3차원 UI구현방법을 제시한다. 이를 위해, 본 논문은 가상의 3D System, Virtual Timeline, Animation Model 등을 구성하였다. 3D System이란 UI가 3차원 좌표계를 가지기 위한 환경을 말하며, Timeline과 Animation Model은 제한적인 성능의STB에서 보다 진보된 애니메이션을 UI에 적용하기 위한 기법이다. 이들은 다양한 애플리케이션 제작, 서비스 개발 등에 응용이 가능하다. 디지털방송은 매우 빠른 속도로 발전하고 있으며 새로운 형태의 서비스가 속속 등장하고 있다. 이러한 흐름에 발맞춰 3D UI는 기존의 TV 화면에서 보다 진보된 형태의 사용자 인터페이스의 모습을 보여줄 것이다.

• Journal of the Computational Structural Engineering Institute of Korea
• /
• v.12 no.3
• /
• pp.293-308
• /
• 1999

이 논문에서는 패널, 깊은 보 그리고 전단벽과 같이 평면응력상태하에 있는 철근콘크리트 구조물의 비선형 유한요소해석에 있어서의 직교이방성 콘크리트 구성 모델의 적용성을 보여준다. 등가의 일축 변형을 개념을 토대로 콘크리트의 구성 관계가 주변형률 축과 일치하고 하중이력에 따라 회전하는 직교하는 축에 대해 제시된다. 제안된 모델은 이축 압축응력상태와 인장-압축 응력상태에서 각각 압축강도의 증가와 인장 저항력의 감소효과를 보여주는 이축 파괴영역의 정의를 포함한다. 인장균열이 발생한 후, 콘크리트의 압축강도의 감소효과가 제시되고, 인장강화효과로 알려진 철근에 의해 지지되는 콘크리트의 인장응력이 고려된다. 평균응력과 평균변형률 개념을 사용하여 힘의 평형, 적합조건 그리고 철근과 철근을 둘러싼 콘크리트 사이의 부착응력-슬림 관계를 토대로 인장강화효과를 모사하기 위한 모델이 제안된다. 유한요소 모델에 의한 예측은 유용한 실험자료와의 비교에 의해 입증된다. 이 논문에서는 해석결과와 이상화한 전단 패널실험으로부터 얻어진 실험값의 비교연구가 수행되고, 제안된 모델의 타당성을 보여주기 위해 서로 다른 응력상태하의 전단 패널 보와 벽체의 힘-변위 관계를 평가하였다.