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박한욱(HanWook Park),변혜원(HaeWon Byun),김창헌(ChangHun Kim) 한국정보과학회 2011 정보과학회논문지 : 시스템 및 이론 Vol.38 No.4
본 논문에서는 다수의 예제로부터 텍스처를 합성하는 새로운 방법을 제안한다. 우리의 알고리즘은 다수 예제로의 확장에서 발생하는 예제 개수의 제한, 다수 텍스처간 다중 복합 전환(multi-way transition), 합성 시간의 과다 증가 등의 문제를 해결한다. 새로운 합성 방법은 전환용 이미지(transition image)와 인덱스 점핑(index jumping) 단계를 도입함으로써 텍스처간 복합 전환을 보이는 결과를 상호작용이 가능한 수준의 합성 시간에 생성한다. 제안된 방법은 복잡한 조작을 필요로 하지 않으며 반복성이 나타나지 않는 비동질적 합성 결과물을 생성 가능한 장점이 있으며, 실험 결과를 통해 이를 확인하였다. In this paper we present a novel method to generate a texture from multiple input exemplars. Our algorithm addresses issues of limitation on the number of input exemplars, multi-way transitions and maintaining parallelism extending the algorithm to handle multiple exemplars. By employing transition image and index jumping our algorithm can generate multi-way transition in reasonable synthesis time. Our approach does not require any special-case handling. We show usefulness of our algorithm by showing aperiodic inhomogeneous synthesis results.
원형 및 사각형 단면 형상을 가진 tandem 실린더의 gap flow 유동현상 규명에 관한 연구
정성용(Sung Yong Jung),박한욱(Hanwook Park) 한국가시화정보학회 2020 한국가시화정보학회지 Vol.18 No.2
Problems related with flows around structures are typical in various engineering fields. The characteristics of these flow structures depend strongly on the shape of the body. The flow regime around square cylinders which are also employed in various applications has also been investigated. In addition to a single body, flows past closely spaced structures arranged in tandem are observed in numerous practical applications. In this study, the flow characteristics around the circular and the square cylinder were investigated according to S/D. The velocity fields and Reynolds stress of the single cylinders were acquired to explain the flow behaviors between tandem cylinders. The differences observed in the flow behaviors of square and circular cylinders were studied. The flow patterns around two tandem cylinders can be classified into three types of wake interference behaviors according to S/D. This is related with the flows between cylinders.
군집을 이루는 유연한 구조물 사이 간격이 유동에 미치는 영향에 관한 연구
성희중(Heejoong Seong),이현진(Hyeonjin Lee),박한욱(Hanwook Park) 대한기계학회 2022 대한기계학회 춘추학술대회 Vol.2022 No.11
It is important to remove microplastics because the environmental pollution caused by microplastics has been becoming serious. The flow characteristics between tandem flexible structures made of Polydimethylsiloxane(PDMS) are experimentally investigated to remove microplastics. Tandem flexible structures are motivated by respiratory cilia. To verify the effect of the gap distance on the movement of tandem flexible structures and flow behaviors in the channel, various gap distance models were fabricated. Gap flow and bending angle of tandem flexible structures are analyzed using flow visualization and Particle Image Velocimetry(PIV) techniques. When gap distance is moderate, a single recirculation flow was formed between tandem flexible structures and reattachment region was formed near the upper position of the rear flexible structure. Moreover, because the second recirculation zone was observed at the lower position of front flexible structure, this moderate gap distance is prepared to remove microplastics under present flow condition.
군집을 이루는 유연한 구조물 사이 간격이 유동에 미치는 영향에 관한 연구
성희중(Heejoong Seong),이현진(Hyeonjin Lee),박한욱(Hanwook Park) 대한기계학회 2022 대한기계학회 춘추학술대회 Vol.2022 No.11
It is important to remove microplastics because the environmental pollution caused by microplastics has been becoming serious. The flow characteristics between tandem flexible structures made of Polydimethylsiloxane(PDMS) are experimentally investigated to remove microplastics. Tandem flexible structures are motivated by respiratory cilia. To verify the effect of the gap distance on the movement of tandem flexible structures and flow behaviors in the channel, various gap distance models were fabricated. Gap flow and bending angle of tandem flexible structures are analyzed using flow visualization and Particle Image Velocimetry(PIV) techniques. When gap distance is moderate, a single recirculation flow was formed between tandem flexible structures and reattachment region was formed near the upper position of the rear flexible structure. Moreover, because the second recirculation zone was observed at the lower position of front flexible structure, this moderate gap distance is prepared to remove microplastics under present flow condition.