• 디지털콘텐츠학회 논문지
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• 제9권3호
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• pp.509-516
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• 2008

컴퓨터 그래픽의 다중 해상도를 지원하는 하이브리드 렌더링 방법을 제안한다. 기본적으로 단말기 환경의 성능과 사용자 요구조건에 따른 그래픽을 위한 다중해상도 방법은 메시를 이용하거나 렌더링 부분에서 텍스쳐의 밉매핑이나 옥트리를 이용한 레이 트레이싱들의 적응 방법이 사용되었다. 본 연구에서는 제안한 하이브리드 렌더링 방법은 지역조명 모델에서 기존의 고로 음영과 평면 음영 라이브러리를 개선한 방법으로 하나의 물체를 이루는 여러 개의 폴리곤에 각각 다른 음영법을 적절하게 적용한다. 실시간 렌더링 시간을 줄일 수 있는 효율적인 대안 방법이 될 수 있으며 이러한 장점이 유비쿼터스 환경에서 다양한 단말기 환경의 그래픽 콘텐츠의 실시간 적응 서비스에 매우 적절하게 사용될 수 있다.

• 동의신경정신과학회지
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• 제30권3호
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• pp.177-184
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• 2019

Objectives: This purpose of this study was to examine the level of communication and clinical skills of Korean medical students according to the participatory method of role playing during medical education. Methods: A total of 100 fourth grade students from the Korean Medical College of Dongshin University in 2018 and 2019 were divided into two groups: Role players and scenario writers. After performing their role-playing, they were asked to complete questionnaires regarding two categories-communication and clinical skills-, consisting of 10 items. Results: 1. Communication skills were measured at approximately 80% of the expected level, and the level difference was shown in detail. 2. Clinical skills were measured at approximately 75% of the expected level, and the level difference was shown in detail. 3. The level of communication skills and the level of clinical skills according to the participatory method did not differ significantly. Conclusions: Writing scenarios in role playing can be observed as having the same effect on communication and clinical skill levels as acting.

• 한국CDE학회논문집
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• 제21권4호
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• pp.378-388
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• 2016

As the needs for the mega-sized, high-rise and irregular shape of building increase, domestic application of BIM in construction industry is increasing in recent years. In this circumstance, interests in BIM modeling and modeling detail level have been also increased. BIM that is based on a three-dimensions, requires a specific and precise building expressions. And model expression level required for each phase such as design, construction, and maintenance of the construction project could be different as its needs. Because that it is not clear to define the criteria for the expression level of construction BIM model, It is difficult to decide how detail and what to model is appropriate in the practical application of BIM model. It could be the reason why the productivity in construction project became lower and lower. In this study we consider the way how to improve the productivity of BIM and analyze the appropriate representation level of construction BIM model through the experts' survey. The results of study could suggest the basis for an appropriate expression level of construction BIM model.

• 한국CDE학회논문집
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• 제10권6호
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• pp.444-454
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• 2005

Recently, the requirements of multi-resolution models of a solid model, which represent an object at multiple levels of feature detail, are increasing for engineering tasks such as analysis, network-based collaborative design, and virtual prototyping and manufacturing. The research on this area has focused on several topics: topological frameworks for representing multi-resolution solid models, criteria for the level of detail (LOD), and generation of valid models after rearrangement of features. As a solution to the feature rearrangement problem, the new concept of the effective zone of a feature is introduced in the former part of the paper. In this paper, we propose a feature-based non-manifold modeling system to provide multi-resolution models of a feature-based solid or non-manifold model on the basis of the effective feature zones. To facilitate the implementation, we introduce the class of the multi-resolution feature whose attributes contain all necessary information to build a multi-resolution solid model and extract LOD models from it. In addition, two methods are introduced to accelerate the extraction of LOD models from the multi-resolution modeling database: the one is using an NMT model, known as a merged set, to represent multi-resolution models, and the other is storing differences between adjacent LOD models to accelerate the transition to the other LOD. We also suggest the volume of the feature, regardless of feature type, as a criterion for the LOD. This criterion can be used in a wide range of applications, since there is no distinction between additive and subtractive features unlike the previous method.

• 한국수자원학회논문집
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• 제40권10호
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• pp.793-800
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• 2007

본 연구는 조석의 영향을 받는 하동2 지점의 수위자료로부터 시간과 주파수 영역에서 유연한 분해능을 갖는 웨이블렛 변환을 적용하여 강우에 의한 유출성분과 조석에 의한 조위성분을 추출하였다. 최종파형 분해단계의 근사성분은 가장 큰 에너지 값은 87.77%를 나타내었으며, 상세성분 중 반일주조형의 주기성(약 12시간)을 갖는 D3의 에너지 값은 10.70%로 나타났다. 또한 D3의 왜도 및 첨도 값은 여수 조위자료와 유사함을 보여주었다. 따라서 하동2 지점의 수위자료에 대하여 최종 분해된 최종파형 분해단계의 근사성분(A6)과 D6, D5 상세성분은 유출성분이며, 상세성분 D4, D3, D2는 조석의 영향으로 수위가 상승과 하강을 반복하는 조위성분인 것으로 나타났다.

• International Journal of CAD/CAM
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• 제3권1_2호
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• pp.111-117
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• 2003

The paper presents an efficient algorithm based on ROAM for visualization of large scale terrain models in real-time. The quality and smoothness of the terrain data visualization within a 3D interactive environment is preserved, while the complexity of the algorithm is kept on a reasonable level. The main contribution of the paper is an introduction of a number of efficient techniques such as implicit coordinates method within the patch array representing ROAM and the viewpoint dependent triangle rendering method for dynamic level of detail (LOD) updates. In addition, the paper presents experimental comparison of a variety of culling techniques, including a newly introduced method: relational position culling. These techniques are incorporated in the visualization software, which allows to achieve more realistic terrain representation and the real-time level of detail reduction.

• 한국측량학회지
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• 제34권6호
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• pp.569-578
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• 2016

With the recent advancement of surveying and technology, the spatial data acquisition rates and precision have been improved continually. As the updates of spatial data are rapid, and the size of data increases in line with the advancing technology, the LOD (Level of Detail) algorithm has been adopted to process data expressions in real time in a streaming format with spatial data divided precisely into separate steps. The existing GRID analysis utilizes the single DEM, as it is, in examining and analyzing all data outside the analysis area as well, which results in extending the analysis time in proportion to the quantity of data. Hence, this study suggests a method to reduce analysis time and data throughput by acquiring and analyzing DEM data necessary for GRID analysis in real time based on the area of analysis and the level of precision, specifically for streaming DEM data, which is utilized mostly for 3D geographic information service.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2018년도 춘계 학술논문 발표대회
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• pp.37-38
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• 2018

BIM(Building Information Modeling) in the architecture, VDC(Virtual Design and Construction) defined CIFE(Center for Integrated Facility Engineering) of Stanford university in USA, and Data-driven design definition issued by TECDOC-1284 of IAEA are doing data-level design generated by 3D CAD technology, integrating and managing related information based on the 3D model, and Using 3D models effectively during nuclear power plant life cycle. 3D model of domestic nuclear power industry is using interference review between design fields, 4D system linked 3D construction model and schedule activity, but the 3D model generated in the design phase is effectively not utilized during the construction, operation, decommissioning. therefore, This study is aimed to suggest 3D model LOD(Level of Detail) advancement method through the analysis of existing literature, 2D drawings, and 3D models throughout nuclear power plant lifecycle.

• 한국정보통신학회논문지
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• 제20권7호
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• pp.1363-1368
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• 2016

비행 시뮬레이터에서는 조종사에게 실제와 흡사한 가상현실을 제공하기 위해서는 원활하면서 현실감 있는 이미지 처리를 위한 일정한 렌더링 속도가 요구된다. 하지만 고해상도 지형 데이터를 사용하는 경우, 개체의 증가로 인해 렌더링 속도가 감소하거나 속도의 변동이 큰 경우가 발생하는 경우가 발생하므로 기존의 연구들은 이를 해결하기 위하여 Level of Detail (LOD)를 적용한다. 하지만, LOD기법의 경우 정점 수가 늘어난 것을 감지한 이후 레벨의 변경을 적용하므로 화면의 변화가 감지되는 문제점이 발생한다. 이를 해결하기 위하여 본 논문에서는 예측 알고리즘을 통해 다음 시점에서 늘어날 렌더링 데이터에 대한 과부하를 예측하고 미리 LOD의 레벨을 조절하는 방법을 제안한다. 또한, 제안된 방법을 검증하기 위해서 예측 데이터와 실제 데이터와 비교하였고 그 결과 LOD 레벨을 조절하였을 때 정점수가 줄어들고 FPS 수치가 변화하는 모습을 보여주었다.

• 한국정보과학회논문지:시스템및이론
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• 제36권3호
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• pp.199-209
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• 2009

본 논문은 세일리언시 밀도에 기반한 스트로크의 단계별 세부묘사(Level of Detail:LOD) 표현 알고리즘을 제안한다. 회화적 렌더링에서 스트로크 LOD는 주된 대상에 대한 관찰자의 시선을 집중시키며 표현의 정확성을 높일 수 있는 장점을 가진다. 이를 위해 세밀하게 묘사된 부분과 추상적 묘사가 될 영역을 구분할 필요가 있다. 본 논문에서는 세일리언시 분포를 기준으로 공간 분할 후, 그 데이터에 기반하여 세밀한 표현의 정도를 제어한다. 세일리언시 분포가 높은 영역은 작가가 표현하고자 하는 주된 대상으로 가정하여 세밀한 묘사가 되도록 하며 밀도가 낮은 영역은 상대적으로 추상적인 표현을 한다. 우리의 알고리즘을 통해 쉽고 명확하게 스트로크 LOD를 제어, 표현 할 수 있다.