• Korea-Australia Rheology Journal
• /
• 제21권1호
• /
• pp.1-12
• /
• 2009

This paper reports the suitability of a domain decomposition technique for the hybrid simulation of dilute polymer solution flows using Eulerian Brownian dynamics and Radial Basis Function Networks (RBFN) based methods. The Brownian Configuration Fields (BCF) and RBFN method incorporates the features of the BCF scheme (which render both closed form constitutive equations and a particle tracking process unnecessary) and a mesh-less method (which eliminates element-based discretisation of domains). However, when dealing with large scale problems, there appear several difficulties: the high computational time associated with the Stochastic Simulation Technique (SST), and the ill-condition of the system matrix associated with the RBFN. One way to overcome these disadvantages is to use parallel domain decomposition (DD) techniques. This approach makes the BCF-RBFN method more suitable for large scale problems.

• 대한전자공학회:학술대회논문집
• /
• 대한전자공학회 1999년도 추계종합학술대회 논문집
• /
• pp.1089-1092
• /
• 1999

Applications using 3D models are increasing recently. Since 3D polygonal models are structured by a triangular mesh, the coding of polygonal models in strips of triangles is an efficient way of representing the data. These strips may be very long, and may take a long time to render or transmit. If the triangle strips are partitioned, it may be possible to perform more efficient data transmission in an error-prone environment and to display the 3D model progressively. In this paper, we devised the Component Based Data Partitioning (CODAP) which is based on Topological Surgery (TS). In order to support the error resilience and the progressively build-up rendering, we partition the connectivity, geometry, and properties of a 3D polygonal model. Each partitioned component is independently encoded and resynchronization between partitioned components is done.

• 한국정보처리학회:학술대회논문집
• /
• 한국정보처리학회 2015년도 춘계학술발표대회
• /
• pp.121-124
• /
• 2015

Recent global and cloud computing render the Internet and Web application to be a paramount field since it is uncomplicated to access and less time and space limitation. On the other hand, a growing number of computations using grid computing techniques indicates the requirements and quantities of large-scale computations are becoming foremost progressively. Therefore, that will be much practicable if there is a Web-based service that could provide Grid computing functions. In this paper, Several similar Web-based cloud and parallel computing systems will be discussed and a model of Web application termed GCaaS which supports grid computing services will be introduced.

• Journal of Industrial and Engineering Chemistry
• /
• 제68권
• /
• pp.6-13
• /
• 2018

Well-modified amino-appended ${\beta}$-cyclodextrin ($AA-{\beta}-CD$) with an amino group at the primary face of the ${\beta}-CD$ was synthesized and used in the catalytic synthesis of chromeno pyrimido[1,2-b]indazol as supramolecular catalysts in water for the first time. $AA-{\beta}-CD$ was characterized by FT-IR, NMR, MALDI-TOF mass spectrometry, and SEM analysis. A possible reaction mechanism featuring molecular complexation was suggested based on 2D NMR (ROESY) spectroscopy, FE-SEM, DSC, and FT-IR. Advantages such as operational simplicity, recyclability of the catalysts, and accessibility in aqueous medium render this protocol eco-friendly.

• 한국컴퓨터정보학회논문지
• /
• 제27권1호
• /
• pp.23-32
• /
• 2022

3D 프로그램을 활용한 방식의 영상 제작과정은 3D 데이터를 시각화하는 렌더링이라는 과정을 거친다. 이 과정은 제작 시간과 작업비용의 부담이 커서 제작자로서는 렌더 비용을 줄이는 것이 중요한 이슈로 대두되고 있다. 본 연구는 실시간렌더엔진인 게임엔진의 렌더링을 영상 제작에 접목해 렌더 시간을 줄여 기존의 제작 시간을 단축하는 방법을 제시하고자 한다. 본 연구의 렌더링 실험을 위해 로봇과 실내 모델링을 3D 제작 프로그램인 마야(Maya)와 게임엔진인 유니티(Unity)로 렌더링을 비교 분석했다. 분석 결과, 유니티는 실시간으로 렌더 되어 렌더 비용을 줄일 수 있고, 렌더된 이미지의 퀄러티 또한 마야에서 렌더된 이미지와 유사한 결과를 나타냈다. 이번 실험을 통해 유니티의 렌더링을 마야와 비교해 분석해 봄으로써 기존의 제작 시간을 단축하는 방법을 제시하고 사용자가 실시간렌더엔진에 접근할 수 있는 가이드를 제공한다.

• 한국HCI학회:학술대회논문집
• /
• 한국HCI학회 2009년도 학술대회
• /
• pp.719-724
• /
• 2009

털 렌더링은 사실적인 렌더링을 위해 많은 수의 털 데이터를 처리해야 하는 어려움이 있다. 대량의 털 데이터를 렌더링함에 있어서 가장 어려운 점은 렌더링 시간이 많이 걸린다는 점이다. 기존의 털 렌더링 방법은 털을 원통형의 실린더로 간주하고 2D 형태의 리본으로 변환하고 삼각화하여 렌더링하는 방법이다. 하지만 이 방법은 언더 샘플링(under sampling) 문제가 있고 렌더링 시간이 오래 걸린다는 단점이 있다. 이런 단점을 개선하기 위해서 이 논문에서는 새로운 알고리즘을 제안하였다. 털을 굵기에 따라 나누고 굵은 털과 가는 털에 각각의 렌더링 방법을 사용함으로써 렌더링 속도를 개선하였다. 또한 전체 렌더링 프레임워크에 대한 제안을 함으로써 보다 효과적인 렌더링을 수행할 수 있다.

• 전기전자학회논문지
• /
• 제12권2호
• /
• pp.124-130
• /
• 2008

벡터 그래픽스는 좌표 정보를 이용하여 이미지를 표현하기 때문에 이미지 퀄리티의 손실 없이 쉽게 확대 축소가 가능하며, 일반적으로 래스터 그래픽스로 표현되는 이미지보다 더 작은 파일 크기를 가진다. 본 논문에서 제안하는 벡터 그래픽 가속기는 개선된 스캔라인 엣지 플래그 방식을 사용하여 엣지의 정렬과정을 수행하지 않고 렌더링을 수행할 수 있도록 설계되었으며 OpenVG 2D 벡터 이미지를 사용하여 검증되었다. 본 논문에서 제안하는 가속기는 Tiger image를 기준으로, 테셀레이션을 수행하는데 12ms, 전체 이미지 렌더링에 208ms의 시간이 소요되며, Tiger image 기준으로 약 초당 5 프레임의 성능을 가진다.

• BMB Reports
• /
• 제53권7호
• /
• pp.357-366
• /
• 2020

Currently, most biological research relies on conventional experimental techniques that allow only static analyses at certain time points in vitro or ex vivo. However, if one could visualize cellular dynamics in living organisms, that would provide a unique opportunity to study key biological phenomena in vivo. Intravital microscopy (IVM) encompasses diverse optical systems for direct viewing of objects, including biological structures and individual cells in live animals. With the current development of devices and techniques, IVM addresses important questions in various fields of biological and biomedical sciences. In this mini-review, we provide a general introduction to IVM and examples of recent applications in the field of immunology, oncology, and vascular biology. We also introduce an advanced type of IVM, dubbed real-time IVM, equipped with video-rate resonant scanning. Since the realt-ime IVM can render cellular dynamics with high temporal resolution in vivo, it allows visualization and analysis of rapid biological processes.

• International Journal of Contents
• /
• 제5권4호
• /
• pp.30-34
• /
• 2009

Many studies have been done on the integral imaging pickup whose objective is to get efficiently elemental images from a lens array with respect to three-dimensional (3D) objects. In the integral imaging pickup process, it is necessary to render an elemental image from each elemental lens in a lens array for 3D objects, and then to combine them into one total image. The multiple viewpoint rendering (MVR) is one of various methods for integral imaging pickup. This method, however, has the computing and rendering time problem for obtaining element images from a lot of elemental lens. In order to solve the problems, in this paper, we propose a parallel MVR (PMVR) method to generate elemental images in a parallel through distribution of elemental lenses into multiple threads simultaneously. As a result, the computation time of integral imaging using PMVR is reduced significantly rather than a sequential approach and then we showed that the PMVR is very useful.

• Computers and Concrete
• /
• 제13권5호
• /
• pp.603-619
• /
• 2014

Soft storey buildings are characterised by having a storey that has a large amount of open space. This soft storey creates a major weak point during an earthquake. As the soft stories are typically associated with retail spaces and parking garages, they are often on the lower levels of tall building structures. Thus, when these stories collapse, the entire building can also collapse, causing serious structural damage that may render the structure completely unusable. The use of special soft storey is predominant in the tall building structures constructed by several local developers, making the issue important for local building structures. In this study, the effect of the incorporation of an isolator on the seismic behaviour of tall building structures is examined. The structures are subjected to earthquakes typical of the local city, and the isolator is incorporated with the appropriate isolator time period and damping ratio. A FEM-based computational relationship is proposed to increase the storey height so as to incorporate the isolator with the same time period and damping ratio for both a lead rubber bearing (LRB) and high-damping rubber bearing (HDRB). The study demonstrates that the values of the FEM-based structural design parameters are greatly reduced when the isolator is used. It is more beneficial to incorporate a LRB than a HDRB.