• 대한원격탐사학회:학술대회논문집
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• 대한원격탐사학회 2002년도 Proceedings of International Symposium on Remote Sensing
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• pp.880-884
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• 2002

According to the development of computer technology, especially in 3D graphics and visualization, the interest for 3D GIS has been increasing. Several commercial GIS softwares are ready to provide 3D function in their traditional 2D GIS. However, most of these systems are focused on visualization of 3D objects and supports few analysis functions. Therefore in this paper, we design not only a spatial operation processor which can support spatial analysis functions as well as 3D visualization, but also implement a prototype to operate them. In order to support interoperability between the existing models, the proposed spatial operation processor supports the 3D spatial operations based on 3D geometry object model which is designed to extend 2D geometry model of OGIS consortium, and supports index based on R$^*$-Tree. The proposed spatial operation processor can be applied in 3D GIS to support 3D analysis functions.

• 한국CDE학회논문집
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• 제20권2호
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• pp.145-158
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• 2015

ISO 15926 is an international standard for the sharing and integration of plant lifecycle information. Plant design data consist of logical configuration, equipment specifications, 2D piping and instrument diagrams (P&IDs), and 3D plant models (shape data). Although 3D computer-aided design (CAD) data is very important data across the plant lifecycle, few studies on the exchange of 3D CAD data using ISO 15926 have been conducted so far. For this, we analyze information requirements regarding plant 3D design in the process industry. Based on the analysis, ISO 15926 templates are defined for the representation of constructive solid geometry (CSG) - based 3D design data. Since system environments for 3D CAD modeling and Semantic Web technologies are different from each other, we present system architecture for processing and visualizing plant 3D design data in the Web Ontology Language (OWL) format. Through the visualization test of ISO 15926-based 3D design data for equipment with a prototype system, feasibility of the proposed method is verified.

• 대한공간정보학회지
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• 제15권3호
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• pp.11-18
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• 2007

유비쿼터스와 관련된 다양한 기술로써 최근 3차원 GIS와 어플리케이션들은 점차 주목받고 있다. 대규모 복합 건물들이 생겨나면서 접근성과 같은 계량적인 측정이 요구되지만, 대부분 접근성과 관련된 연구들은 2차원 네트워크 기반으로 이루어 졌을 뿐 3차원 공간상에서의 접근성 분석에 관한 연구는 사례가 극히 드물다. 따라서 본 연구에서는 3차원 공간에서의 접근성을 산출하는 방법을 제안하고 기존의 전통적인 Space Syntax에서의 접근성 산출방법과 이를3차원 공간 내에 적용하기 위한 새로운 방법을 제시하고, 공간간의 거리, 방향전환, 층간 이동 등의 부하를 고려함으로써 공간의 깊이를 산출하였다. 개발된 방법은 캠퍼스 건물모델에 적용하여 비교 분석하였다.

• 한국건설관리학회:학술대회논문집
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• 한국건설관리학회 2001년도 학술대회지
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• pp.137-142
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• 2001

공정관리분야 전산 소프트웨어는 개발초기의 단순한 일정계산결과 제공에서 기성관리, 진도관리, 자원관리 등의 결과까지 제공하고 있으나, 여전히 2D 개념의 분석결과만을 제공하고 있다. 최근 국내외에서 개발되고 있는 공정관리시스템은 기존의 2D 공정표 (시간)와 3D 도면 (공간)을 연계한 4D 개념으로 발전되고 있다. 본 연구에서는 4D 시스템의 기본적 접근이론과 현재까지 개발된 대표적 4D 시스템들의 주요 기능분석을 통하여, 현재의 4D 공정관리시스템이 갖고 있는 활용상 문제점과 향후 개선방향을 분석하였다.

• ETRI Journal
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• 제42권2호
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• pp.272-281
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• 2020

Three-dimensional (3D) selfie services, one of the major 3D printing services, print 3D models of an individual's face via scanning. However, most of these services require expensive full-color supporting 3D printers. The high cost of such printers poses a challenge in launching a variety of 3D printing application services. This paper presents a stencil-based 3D facial relief creation method employing a low-cost RGBD sensor and a 3D printer. Stencil-based 3D facial relief is an artwork in which some parts are holes, similar to that in a stencil, and other parts stand out, as in a relief. The proposed method creates a new type of relief by combining the existing stencil techniques and relief techniques. As a result, the 3D printed product resembles a two-colored object rather than a one-colored object even when a monochrome 3D printer is used. Unlike existing personalization-based 3D printing services, the proposed method enables the printing and delivery of products to customers in a short period of time. Experimental results reveal that, compared to existing 3D selfie products printed by monochrome 3D printers, our products have a higher degree of similarity and are more profitable.

• 한국산림과학회지
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• 제106권4호
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• pp.480-486
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• 2017

본 연구는 국내 소나무, 잣나무, 낙엽송을 대상으로 입목의 총재적 중 상부직경 혹은 상부수고까지의 재적을 예측하는 이용재적모델을 개발하고자 수행되었다. 모델개발을 위하여 사용된 자료는 강원 및 경북지역의 소나무림, 잣나무림, 낙엽송림에서 수집한 총 131본의 수간석해목이었으며, 이용재적비율, 단순비율형태, 지수비율형태의 6개 이용재적식을 검토하여 최종모델을 개발하였다. 본 연구의 분석결과, 상부직경까지의 이용재적예측은 지수비율형태인 $V_d=V_t\{{\exp}[{\alpha}_1(d^{{\alpha}_2}/D^{{\alpha}_3})]\}$ 이 상부수고까지의 이용재적예측은 단순비율형태인 $V_h=V_t\{1+{\beta}_1(P^{{\beta}_2}/H^{{\beta}_3})\}$이 최종모델로 선정되었다. 본 연구에서 선정된 2개의 최적모델식을 정리하여 내재간곡선식을 도출하였으며, 이를 활용해 상부직경에 따른 상부수고와 상부수고에 따른 상부직경 예측이 가능하였다. 본 연구결과에서 개발된 모델은 높은 정확도뿐만 아니라 임업현장에서 편리하게 사용할 수 있어 활용도가 높을 것으로 판단된다.

• 대한기계학회:학술대회논문집
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• 대한기계학회 2003년도 춘계학술대회
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• pp.1199-1204
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• 2003

The 3D simulations of the shielding concrete and the Rotary Specimen Rack(RSR) in the Korea Research Reactor-1&2(KRR-1&2) were carried out in present work. Four main dismantling processes, which are the removal of the RSR, reactor core region, beam tube, and thermal column and activated concrete, were selected for the graphic simulation by the consideration of the activation, worker training, work difficulty and so on. On the basis of these, we constructed their 3D CAD models and then drawn and reviewed their dismantling processes. In this study, the 3D simulation results of the shielding concrete and the RSR among main components are also presented and discussed.

• Journal of information and communication convergence engineering
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• 제20권3호
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• pp.143-152
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• 2022

The ongoing adoption of 5G will increase the data traffic, throughput, multimedia services, and power consumption for future wireless applications and services, including sensor and mobile networks. Multipath fading on wireless channels also reduces the system performance and increases energy consumption. To address these issues, device-to-device (D2D) and cooperative communications have been proposed. In this study, we propose two inter-clustering models using the relay selection method to improve system performance and increase energy efficiency in cooperative D2D networks. We develop two inter-clustering models and present their respective algorithms. Subsequently, we run a computer simulation to evaluate each model's outage probability (OP) performance, throughput, and energy efficiency. The simulation results show that inter-clustering model II has the lowest OP, highest throughput, and highest energy efficiency compared with inter-clustering model I and the conventional inter-clustering-based multirelay method. These results demonstrate that inter-clustering model II is well-suited for use in 5G overlay D2D and cellular communications.

• 한국음향학회지
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• 제43권2호
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• pp.162-167
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• 2024

풍력발전기에서 방사되는 저주파 소음은 가장 관심이 높은 불만족 사항 중의 하나이다. 이에 본 연구에서는 공학적으로 유용하게 사용할 수 있는 덴마크 모델과 ISO 9613에 기초한 상용 프로그램인 SoundPLAN과 ENPro에 의한 풍력발전기 저주파 소음 예측값들과 측정값을 비교함으로써 모델들에 대한 신뢰성을 살펴보았다. 육상에서 대표적인 3 MW급 풍력발전기를 대상으로 적용한 결과 주파수 12.5 Hz에서 80 Hz 범위에서 측정값과 예측값은 최대 5 dB 이내의 차이를 보였다. 이러한 원인으로는 대상 풍력발전기는 7년 이상 운영되었기 때문에 음향파워레벨의 변화가 생겼기 때문으로 추정할 수 있다. 하지만 저주파 대역에서 가장 정확하다고 할 수 있는 Boundary Element Method (BEM) 예측값과 다른 모델에 의한 예측값 그리고 측정값은 2.5 dB 이내로 잘 일치한 점을 고려할 때 본 연구 대상의 모델들은 3 dB 이내의 편차로 활용될 수 있을 것으로 기대된다.

• 국제학술발표논문집
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• The 9th International Conference on Construction Engineering and Project Management
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• pp.1253-1253
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• 2022

Although the construction industry is changing from a 2D-based to a 3D BIM-based management process, 2D drawings are still used as standards for permits and construction. For this reason, 2D deliverables extracted from 3D BIM are one of the essential achievements of BIM projects. However, due to technical and institutional problems that exist in practice, the process of extracting 2D deliverables from BIM requires additional work beyond generating 3D BIM models. In addition, the consistency of data between 3D BIM models and 2D deliverables is low, which is a major factor hindering work productivity in practice. To solve this problem, it is necessary to build BIM data that meets information requirements (IRs) for extracting 2D deliverables to minimize the amount of work of users and maximize the utilization of BIM data. However, despite this, the additional work that occurs in the BIM process for drawing creation is still a burden on BIM users. To solve this problem, the purpose of this study is to increase the productivity of the BIM process by automating the process of extracting 2D deliverables from BIM and securing data consistency between the BIM model and 2D deliverables. For this, an expert interview was conducted, and the requirements for automation of the process of extracting 2D deliverables from BIM were analyzed. Based on the requirements, the types of drawings and drawing expression elements that require automation of drawing generation in the design development stage were derived. Finally, the method for developing automation technology targeting elements that require automation was classified and analyzed, and the process for automatically extracting BIM-based 2D deliverables through templates and rule-based automation modules were derived. At this time, the automation module was developed as an add-on to Revit software, a representative BIM authoring tool, and 120 rule-based automation rulesets, and the combinations of these rulesets were used to automatically generate 2D deliverables from BIM. Through this, it was possible to automatically create about 80% of drawing expression elements, and it was possible to simplify the user's work process compared to the existing work. Through the automation process proposed in this study, it is expected that the productivity of extracting 2D deliverables from BIM will increase, thereby increasing the practical value of BIM utilization.