• 전자공학회논문지 IE
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• 제46권1호
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• pp.7-15
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• 2009

본 논문에서는 지상라이다를 이용한 구조물의 자동 윤곽선 추출을 다룬다. 본 논문에서는 사진을 이용하지 않고 전처리를 하지 않은 데이터를 직접 이용하여 구조물의 정면 윤곽선을 추출하는 것을 제안한다. 또한, 구조물의 크기와 데이터 수 즉, 라이다로 측정한 포인트 수를 고려한 효율적인 데시메이션 방법을 제안하였다. 이렇게 데시메이션된 데이터에서 라이다 데이터의 주요 특성중 하나인 거리정보를 이용하여, 구조물과 구조물이 아닌 점으로 구별해낸다. 그 후, 분산을 이용해 지역적으로 절대 좌표값이 큰 값과 작은 값을 찾아내고, 이를 윤곽선 후보 점으로 한다. 이렇게 찾아낸 구조물 윤곽선의 후보점들을 이어 윤곽선으로 만들고 최종적으로 정리하여 좀 더 현실에 가까운 윤곽선을 자동으로 추출하는 방법을 제안한다.

• 대한원격탐사학회지
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• 제39권5_2호
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• pp.837-847
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• 2023

본 연구는 사고현장에서 화학물질로 인해 발생한 사고지점의 피해면적을 식생지수로 산출하는 방안을 연구하였다. 자료수집은 두 종류의 드론을 활용하였으며, 사진측량기법을 적용한 3차원 점군자료에서 피해면적을 산출하였다. 다중분광센서의 분광대역 정보를 활용하여 제작한 정사영상을 토대로 식생지수 영상을 제작하였고, 임계값에 따른 피해면적의 결과로 사고현장에 대한 통계를 분석하였다. 근적외선 밴드 기반의 식생지수 Kappa 값은 0.79, 녹색 밴드 기반의 식생지수는 0.76으로 화학물질사고 조사현장에서 식생지수를 활용한 피해면적 분석 방법을 활용할 수 있을 것으로 판단된다.

• 한국측량학회지
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• 제25권5호
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• pp.427-436
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• 2007

각종 시설물들의 건설로 인해 형성된 사면은 붕괴의 위험성을 앉고 있기 때문에 사면의 현장에 대한 정보를 수집하기 위한 기존의 조사 방법들은 조사기간의 장기화, 계측장비에 대한 비용 및 접근성 등의 문제점이 제기되고 있으며, 이는 자료 수집의 한계점으로 제시되고 있다. 본 연구에서는 어느 위치에서든지 줌렌즈를 사용하여 영상을 취득할 수 있도록 하기 위하여 줌렌즈를 초점거리별로 검정하여 자유로이 줌을 사용할 수 있도록 하였다. 초점 거리별 검정 데이터 값은 DB(Date Base)화하여 여러 종류의 카메라나 또는 다른 렌즈를 사용하여 측정을 하더라도 자동으로 촬영한 초점거리의 카메라 검정데이터 값과 카메라정보를 불러오도록 Image Loader 시스템을 개발하였다. 또한, 취득한 대상물의 입체영상으로부터 3차원 공간영상정보를 구축함으로써 사면측량 및 조사에 효율적인 기초 자료로 제공하고자 하며, 사람이 접근할 수 없는 위험사면에 대한 정확한 측량방법을 제시하고자 한다.

• 한국컴퓨터정보학회논문지
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• 제27권9호
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• pp.139-147
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• 2022

본 연구에서는 증강현실 기술을 이용하여, 화학에 입문하는 사람이 화학 학습에 필요한 지식을 쉽게 습득할 수 있도록 모바일 애플리케이션을 개발하는 것을 목표로 한다. 본 연구에서는 2차원 형태의 그림을 인식해 화학 구조를 3차원의 개체로 증강 시켜 사용자의 화면에 보여주고, 이와 관련된 다분야의 정보를 동시에 제공하는 서비스를 활용해 새로운 화학 학습 경험을 제공하는 점이 특징이다. 이를 위해 별도의 시스템과 콘텐츠를 구성하였고, 안전하고 실시간적인 데이터 관리를 위해 로그인 API와 실시간 데이터베이스 기술을 사용하였으며, 이미지 인식 및 3차원 개체 증강 서비스를 위해 이미지 트래킹 기술을 사용하였다. 본 연구를 통한 결과는 실험을 통해 유의미한 결과를 도출하였다. 향후 연구에서는 화학 구조 데이터 라이브러리를 사용하여 효율적으로 데이터를 불러오고 출력할 수 있도록 한다.

• 근관절건강학회지
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• 제22권3호
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• pp.219-227
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• 2015

Purpose: The purpose of this study was to investigate the degree of dietary compliance, nutritional status, and stages of disease in patients with liver cirrhosis and to identify the relationships among those variables. Methods: This study used a cross-sectional design and conducted a survey of 100 patients who were treated at D-university hospital in Busan. For data analysis, descriptive statistics and Pearson's correlation coefficients were performed using SPSS/WINdow 20.0 program. Results: The mean score of dietary compliance was 3.50 in the a 5-point scale. Stage of disease was significantly correlated with dietary compliance (r=.20, p=.048), and protein as one of nutritional status (r=-.44, p<.001). Conclusion: These findings suggest that dietary compliance of patients with liver cirrhosis can have an influence on prognosis of disease. Therefore, patients should be encouraged to improve dietary compliance from the early stage of liver cirrhosis.

• Journal of Computing Science and Engineering
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• 제4권3호
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• pp.207-224
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• 2010

This paper presents a compression scheme for mesh geometry, which is suitable for mobile graphics. The main focus is to enable real-time decoding of compressed vertex positions while providing reasonable compression ratios. Our scheme is based on local quantization of vertex positions with mesh partitioning. To prevent visual seams along the partitioning boundaries, we constrain the locally quantized cells of all mesh partitions to have the same size and aligned local axes. We propose a mesh partitioning algorithm to minimize the size of locally quantized cells, which relates to the distortion of a restored mesh. Vertex coordinates are stored in main memory and transmitted to graphics hardware for rendering in the quantized form, saving memory space and system bus bandwidth. Decoding operation is combined with model geometry transformation, and the only overhead to restore vertex positions is one matrix multiplication for each mesh partition. In our experiments, a 32-bit floating point vertex coordinate is quantized into an 8-bit integer, which is the smallest data size supported in a mobile graphics library. With this setting, the distortions of the restored meshes are comparable to 11-bit global quantization of vertex coordinates. We also apply the proposed approach to compression of vertex attributes, such as vertex normals and texture coordinates, and show that gains similar to vertex geometry can be obtained through local quantization with mesh partitioning.

• KIEAE Journal
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• 제7권1호
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• pp.23-31
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• 2007

This study aims to evaluate the illuminance performance of sloped light guide with automated venetian blind systems. For the purpose, a mock-up model was constructed as a prototype of Korean office building with $12.0m{\times}7.3m{\times}3.7m$ ($w{\times}d{\times}h$) and south facing side-window mounted between the clerestory window($2.0m^2$) and the view window($5.6m^2$). The light guide of 1.28m deepth and $29^{\circ}$ tilted angle, is covered with 0.6mm galvanized steel sheet and 97% reflective film. To protect the room from low solar angle, a blind systems, 0.15m deepth and $30^{\circ}$ automated slat angle was installed. To assess illuminance performance, the totally 37 measuring points for illuminance were monitored. For the detailed analysis, photometric sensors were installed at work-plane (8 points), wall (7 points), ceiling (3points), and exterior horizontal illuminance (1 point) respectively. The performance was measured under clear sky and is monitored by Agilent data logger, photometric sensor Li-cor and the Radiant Imaging ProMetric 1400. Comparisons of light factor and uniformity are discussed.

• Perspectives in Nursing Science
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• 제12권1호
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• pp.42-49
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• 2015

Purpose: The purpose of this study was to investigate nursing students' awareness of career decision-making self-efficacy, career search behavior and commitment to career choice. Methods: Data were collected using a self-report questionnaire from 397 nursing students in D city from October 1 to October 8, 2014. Results: The average score of career decision-making self-efficacy, career search behavior and commitment to career choice was 3.42, 3.08 and 3.27 on a Likert 5 point-scale respectively. Career decision-making self-efficacy and career search behavior were significantly different according to grade of subject. There were positive correlations between career decision-making self-efficacy, career search behavior and commitment to career choice. Conclusion: It is necessary to develop an effective career support program from 1st grade to improve nursing student's career decision-making self-efficacy, career search behavior and commitment to career choice.

• 한국운동역학회지
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• 제17권1호
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• pp.69-79
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• 2007

The purpose of this study was to examine the characteristics of throwing motion in the elementary school students from the developmental point of view. For the purpose of this, total of nine subjects(each of three students in five, third, and first grades) were participated. They were asked to throw the ball as far as they can and the motions were videotaped with the 30frames/sec and 1/500 shutter speed. The successful motions for each subject were selected for three dimensional analysis. The collected data were analyzed using DV express 1.0 and Kwon3D 3.0 softwares. The results obtained from this study were as follows; 1. Total time for the throwing motion of the first grade was longer than that of the fifth and third grades. 2. The resultant displacement and velocity of COM for the fifth and third grades were greater than that of the frist grade. 3. The first grade tended to flex the trunk forward excessively during the throwing motion. 4. The fifth grade tended to place the upper arm close to the sagital plane and move the forearm and hand freely. 5. Looking at the greater variability of the angular velocity of the hand segment, the fifth grade seemed to have faster and more flexible movement of the wrist. 6. There were somewhat differences in the patterns and magnitudes of ground reaction forces among the different grades.

• Journal of Electrical Engineering and Technology
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• 제7권3호
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• pp.349-357
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• 2012

This paper presents a hybrid motor prototype convenient to modify the magnet and reluctance torques. The rotor of the prototype consists of magnet and reluctance parts, so the generated torque includes both magnet and reluctance torques. A considerable feature of the motor is that the ratio of the magnet and reluctance parts can be modified on the rotor and the rotor hybridization ratio can be varied. Another important point is the mechanical angle between the parts changed by means of the suitable construction of the parts on the rotor shaft. Finite element (FE) analysis was carried out for the proposed motor and static torque measurements were realized. The FE results were compared with the experimental results. Average torque and maximum torque values were obtained and three dimensional 3-D graphs were formed by using the experimental data. It is possible to make different combinations by changing the parts and the angle between the parts due to the proposed motor. So the magnet and reluctance torques are modified and different combinations give different torque behavior.