• Journal of information and communication convergence engineering
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• 제17권2호
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• pp.91-96
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• 2019

In this study, a system to increase the expressiveness of existing standard terminology using three-dimensional (3D) data is designed. We analyze the existing medical terminology system by searching the reference literature and perform an expert group focus survey. A human body image is generated using a 3D modeling tool. Then, the anatomical position of the human body is mapped to the 3D coordinates' identification (ID) and metadata. We define the term to represent the 3D human body position in a total of 12 categories, including semantic terminology entity and semantic disorder. The Blender and 3ds Max programs are used to create the 3D model from medical imaging data. The generated 3D human body model is expressed by the ID of the coordinate type (x, y, and z axes) based on the anatomical position and mapped to the semantic entity including the meaning. We propose a system of standard terminology enabling integration and utilization of the 3D human body model, coordinates (ID), and metadata. In the future, through cooperation with the Electronic Health Record system, we will contribute to clinical research to generate higher-quality big data.

• 패션비즈니스
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• 제27권4호
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• pp.21-37
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• 2023

This study aimed to classify the hand types of adult males aged 20 to 69 years using three-dimensional measurement data from the 2020 8th Korean Anthropometric Survey, the latest measurement data from the National Institute of Standards and Technology Size Korea, and explore the characteristics of each type. Through this, I aimed to draw implications for the development of work gloves. The factors that make up an adult male's hand were categorized into hand and finger thickness factors, palm length factors, and finger length factors. Adult male hands were categorized into four types: small, thin hands and long fingers; thick, long fingers; medium, short hands and fingers; and large, thin, short fingers. The analysis showed that the younger the age, the more slender and long the hands and fingers, and as age increased, hands and fingers became shorter and thicker. Implications for the development of work gloves included the need for size segmentation based on the age of the work glove user, changes in the way glove dimensions are set based on hand length and hand circumference, and the need to segment gloves by the type of work. Hand typing in future research should be done according to occupational groups, and glove patterns should be developed for each type of work based on the results of this study.

• Geomechanics and Engineering
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• 제34권4호
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• pp.437-447
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• 2023

Inclined piles are commonly used in civil engineering constructions where significant lateral resistance is required. Many researchers proved their positive performance on the seismic behavior of the supported structure and the piles themselves. However, most of these numerical studies were done within the framework of linear elastic or elastoplastic soil behavior, neglecting therefore the soil non-linearity at low and moderate soil strains which is questionable and could be misleading in dynamic analysis. The main objective of this study is to examine the influence of the pile inclination on the seismic performance of the soil-pile-structure system when both the linear elastic and the nonlinear soil models are employed. Based on the comparative responses, the adequacy of the soil's linear elastic behavior will be therefore evaluated. The analysis is conducted by generating a three-dimensional finite difference model, where a full interaction between the soil, structure, and inclined piles is considered. The numerical survey proved that the pile inclination can have a significant impact on the internal forces generated by seismic activity, specifically on the bending moment and shear forces. The main disadvantages of using inclined piles in this system are the bending forces at the head and pile-to-head connection. It is crucial to account for soil nonlinearity to accurately assess the seismic response of the soil-pile-structure system.

• 패션비즈니스
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• 제27권3호
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• pp.19-34
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• 2023

The purpose of this study was to analyze the three-dimensional hand-related dimensions of elderly women aged 70 to 84 years and to characterize them to develop safety gloves for dementia patients. The 3D data from the 8th Human Size Survey of the National Institute of Standards and Technology, Size Korea, were analyzed using the SPSS 26.0 program. The straight thumb length was longer in elderly women aged 70-74 than in those aged 80-84. To analyze the hand type of elderly women, four factors were categorized: hand and finger horizontal factor, hand vertical factor, finger digit V thickness factor, and finger length factor. Elderly women's hand types were categorized as 'long hands and thin fingers', 'thick hands with long fingers', and 'short hands and thick little fingers'. Elderly women aged 70-74 years and 80-84 years were analyzed as having the most 'long hands and thin fingers' type, while older women aged 75-79 years were analyzed as having the most 'thick hands and long fingers' type. It is known that the fingers get thicker and the size of hands increase as age advances, but by the age 80, there is a change in the size of hands again. In future research, it would be worth expanding to other age groups to explore differences between age groups and to develop safety gloves for real-world dementia patients based on the hand types analyzed.

• 한국지형학회지
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• 제28권4호
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• pp.41-52
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• 2021

With the popularization of drones and the ease of use of the Global Navigation Satellite System (GNSS), drone photogrammetry for terrain information has been widely used. Drone photogrammetry enables the realization of high-accuracy three-dimensional topography for the entire area with less effort and time compared to the past direct survey using GNSS or total station. From 3-D topographic data, various topographical analysis is possible. To improve the accuracy of drone photogrammetry, direct GCP surveying in the field is essential, and the numbers and reasonable positioning of GCPs are very important. In the case of beaches or tidal flats on the west coast of Korea, the numbers and location of GCPs are important factors in efficient drone photogrammetry because of the size of the area, difficulties of movement, and the risk from tides. If the RTK (Real-time kinematic) or PPK (Post-processed kinematic) method is used, the increased accuracy of the drone's location enables high-accuracy photogrammetry with a small number of GCPs. This study presents an efficient drone photogrammetry method in terms of time and economy by comparing and analyzing the results of drone photogrammetry using Non-PPK with low-cost PPK-Kit, based on the tests of various numbers and locations of GCPs in the university field including various slopes and structures like coastal terrain.

• Geomechanics and Engineering
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• 제38권3호
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• pp.275-284
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• 2024

This paper aims to explore the evolution of the pullout behavior of geocell reinforcement insights from three-dimensional numerical studies. Initially, a developed model was validated with the model test results. The horizontal displacement of geocells and infill sand and the passive resistance transmission in the geocell layer were analyzed deeply to explore the evolution of geocell pullout behavior. The results reveal that the pullout behavior of geocell reinforcement is the pattern of progressive deformation. The geocell pockets are gradually mobilized to resist the pullout force. The vertical walls provide passive pressure, which is the main contributor to the pullout force. Hence, even if the frontal displacement (FD) is up to 90m mm, only half of the pockets are mobilized. Furthermore, the parametric studies, orthogonal analysis, and the building of the predicted model were also carried out to quantitative the geocell pullout behavior. The weights of influencing factors were ranked. Ones can calculate the pullout force accurately by inputting the aspect ratio, geocell modulus, embedded length, frontal displacement, and normal stress.

• 한국측량학회지
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• 제36권3호
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• pp.117-126
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• 2018

Due to intelligent transport systems, location-based applications, and augmented reality, demand for image maps and 3D (Three-Dimensional) maps is increasing. As a result, data acquisition using UAV (Unmanned Aerial Vehicles) has flourished in recent years. However, even though orthophoto map production and research using UAVs are flourishing, few studies on 3D modeling have been conducted. In this study, orthophoto and 3D modeling research was performed using various angle images acquired by a UAV. For orthophotos, accuracy was evaluated using a GPS (Global Positioning System) survey that employed VRS (Virtual Reference Station) acquired checkpoints. 3D modeling was evaluated by calculating the RMSE (Root Mean Square Error) of the difference between the outline height values of buildings obtained from the GPS survey to the corresponding 3D modeling height values. The orthophotos satisfied the acceptable accuracy of NGII (National Geographic Information Institute) for a 1/500 scale map from all angles. In the case of 3D modeling, models based on images taken at 45 degrees revealed better accuracy of building outlines than models based on images taken at 30, 60, or 75 degrees. To summarize, it was shown that for orthophotos, the accuracy for 1/500 maps was satisfied at all angles; for 3D modeling, images taken at 45 degrees produced the most accurate models.

• 지적과 국토정보
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• 제47권1호
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• pp.179-190
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• 2017

문화재의 현황 파악 및 복원을 위한 3차원 모델링에 있어서 지상 LiDAR와 UAV의 활용방안을 제시하고자 대상 문화재에 대해 지상 LiDAR 측량을 실시하고 UAV 영상을 취득하였다. 이를 통해 생성된 포인트 클라우드의 정확도를 비교하고 3차원 모델의 중첩분석 및 융합 모델을 생성하였다. 그 결과, 문화재의 변위 및 변형을 감지하기 위해 실시하는 3차원 모델링의 경우에는 지상 LiDAR를 이용한 정밀한 모델링이 적합함을 알 수 있었으며, UAV 모델은 지상 LiDAR 모델에 비해 급격한 굴곡이 발생하는 부분을 상세하게 표현하지 못하는 한계가 있지만 UAV 모델은 모델링을 수행하는 범위가 넓으며 실물 문화재의 모델링이 가능한 이점이 있음을 알 수 있었다. 또한 최종적으로 지상 LiDAR 모델과 UAV 모델의 이점을 살린 융합 모델을 생성함으로써 문화재의 기초자료 구축 분야에서 효율적인 활용이 가능할 것으로 판단된다.

• 한국지리정보학회지
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• 제11권3호
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• pp.68-79
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• 2008

한국건설기술연구원(KICT)에서는 도로의 안전성 분석을 위해서 도로의 각종 정보를 이동하는 차량을 이용하여 신속하게 취득하고, 이를 토대로 도로의 결함구간을 분석할 수 있는 도로 안전성 조사 분석 차량(RoSSAV, Road Safety Survey and Analysis Vehicle)을 개발하였다. 본 연구를 통해 도로의 안전성에 의심이 되는 지역에 대해서 3차원 도로 모델링을 통한 도로 선형 결함 알고리즘을 개발하였으며, 이를 위해서는 신속하고 정확한 데이터가 수집되어야 한다. 차량에 회전식 레이저 스캐너, GPS(Global Positioning System), INS(Inertial Navigation System), CCD(Charge-Coupled Device) 카메라 그리고 DMI(Distance Measuring Instrument) 등 여러 센서를 장착하여 데이터를 취득하였다. 마지막으로 이들 데이터를 통합하여 3차원 도로 기하(도로 중심선, 도로 경계선), 도로 시설물과 사면을 추출하였다.

• 대한공간정보학회지
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• 제21권2호
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• pp.117-123
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• 2013

본 연구는 비측량용 카메라와 전방위 회전이 가능한 헤드 장비를 이용하여 자동 영상집성을 수행하기 위한 최적의 촬영각 및 중복도를 결정하는데 초점을 맞추고 있다. 렌즈 종류별 화각, 헤드의 옵션별 이동각을 고려하여 중복도를 계산하고, 촬영 소요시간, 저장용량, 실제 영상집성 성능 등을 감안하여 최적의 촬영중복도와 촬영각을 결정하였다. 실험결과를 통해, 35mm 렌즈를 사용하여 수직방향으로 $36^{\circ}$(33.82% 중복도), 수평방향으로 $24^{\circ}$ 또는 $30^{\circ}$(36.51% 또는 20.63% 중복도) 간격으로 촬영하는 것이 자동 영상집성에 가장 효과적임을 확인할 수 있었다.