• Journal of the Korean Society of Visualization
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• v.21 no.1
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• pp.74-79
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• 2023

Thrombogenesis, which is the process of blood clot formation, can be initiated by platelet activation. Excessive formation of blood clot in the bloodstream can lead to thrombosis. Therefore, when dealing with patients with disseminated intravascular coagulation (DIC) or children, it is necessary to use small amounts of blood. Hence, it is important to develop methods for the rapid and accurate measurement of the platelet function using a small amount of blood. In this study, 3D printing technology was utilized to facilitate the production of micro channels. The amount of platelet adhesion in smokers and non-smokers was compared by repeatedly exposing the structure of the channel to adjust the number of blood injections and facilitate thrombosis attachment to simple stenosis structures.

• Journal of the Korea institute for structural maintenance and inspection
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• v.23 no.4
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• pp.137-144
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• 2019

In coupon test of carbon fiber reinforced polymers (CFRP) as brittle materials, the converted strain derived from total deformation and effective length was introduced and its advantages were described. In general, measured value from strain gauge is used for determining the tensile properties of material, but it is not quite effective in CFRP because brittle material can not redistribute its stress and it only represents local behavior. For this reason, the converted strain response can be utilized effectively as a supplementary indicator, which evaluated the average value of tensile properties in brittle material and confirmed the strain measured by strain gauge. In addition, the converted strain clearly visualized 1) the effect of initial internal strain caused by fabrication errors and setup misalignment when applying gripping force and 2) post-response of partial rupture of CFRP caused by non-uniform strain distribution. non-uniform strain distribution.

• The Journal of the Korea institute of electronic communication sciences
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• v.9 no.11
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• pp.1249-1254
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• 2014

Big data based on numerous data made by the people are used in order to obtain useful information. We can obtain more useful information if it can apply machine learning techniques added deformation of human memory on the characteristics of the computer program. And big data is predicted by using these conclusions. Humans are used to remember similar data as an original data, so big data processing technology should reflect these human characteristics. In this study, this algorithm to provide the selectivity of information is proposed. This algorithm is the technology to reflect the above factors. This algorithm is selected the data with high selectivity to determine similar data based on the deformation characteristics of the data.

• Computational Structural Engineering
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• v.3 no.2
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• pp.117-128
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• 1990

This study was intended to provide efficient algorithms for high quality postprocessing on the basis of microcomputers with limited capacity and functionality. Improved methods of postprocessing including stress contouring, internal force diagraming, and displacement animation, were proposed and implemented into a new finite element system. Visualization of three-dimensional structural behaviors was treated with special emphasis.

• Journal of the Korean Society for Precision Engineering
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• v.21 no.5
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• pp.14-18
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• 2004

스페클 간섭계는 빛을 이용하는 측정 방법이므로 비접촉/원격 측정 방법이며, 빛의 파장의 수십-수백 분의 1 정도의 정밀도로 측정이 가능하고, 레이저가 조사되는 영역 전체의 동시 측정이 가능하다는 장점을 가지고 있다 특히 최근에는 전자, 영상, 컴퓨터 기술의 발달에 힘입어 ESPI(Electronic Speckle Pattern interferometer; 전자 스페클 상관 간섭계) 장치가 많은 발전을 이루었고, 이에 따라 산업 현장에서의 활용도 계속 늘고 있다. (중략)

• Proceedings of the Korean Information Science Society Conference
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• 2003.04c
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• pp.630-632
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• 2003

컴퓨터 가상현실 기술은 반복적인 교육과 훈련을 필요로 하는 의료 시뮬레이션 분야에 도입되어 시술 훈련, 수술 계획 및 수술 시뮬레이션 등의 영역에 응용되고 있다. 3차원적 가시화나 네비게이션에 치중하던 기존의 의료 시뮬레이션에 보다 현실감을 증진시키기 위해서는 인체 해부학적 기관의 변형성과 사용자와 대상 기관 사이의 물리적인 상호작용이 반영되어야 한다. 본 연구에서는 기존의 2차원 및 3차원 마우스만을 사용하던 상호작용 환경을 개선하여 시술 동작시 물리적인 역감을 전달받을 수 있는 햅틱 인터페이스를 도입하고. 보다 현실감 있는 시각적 디스플레이를 위해 햅틱 워크벤치를 사용하였다. 사용자의 햅틱 인터페이스 조작에 따른 가상 인체 기관의 물리적 변형 및 이에 따른 물리적 역감은 삼각메쉬를 이용한 매스-스프링 모델을 사용하여 구현하였고. 가상 시술 도구와 가상 인체 기관와의 빠른 충들 감지를 위해서는 OBBTree를 적용하였다.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• v.2
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• pp.39-44
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• 2006

현재 조선산업은 선박의 대형화 추세에 맞추어 선체블록 규모가 대형화되고 있다. 따라서 대형 선체블록제작을 위한 블록전문업체가 증가하고 있으며, 그에 따른 블록조립 및 정도계측기술 개발이 절실히 요구되고 있다. 이에 본 연구에서는 그간 수행해온 블록계측과 관련된 각종 데이터베이스를 구축하고, 시스템 기능구현에 핵심 기술인 소프트웨어 개발 기법, 정보 가시화 기법을 제시하고 이를 이용한 인터페이스를 개발하여 본 시스템의 구성요소를 유기적으로 연결하여 사용하는 과정을 시연함으로써 블록조립 정도평가 시스템의 유용성과 기능을 검증하였다.

• Journal of Biomedical Engineering Research
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• v.22 no.6
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• pp.535-542
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• 2001

Endovascular embolization technique using a steno is currently used to treat the wide neck aneurysm. Since intraaneurysmal flow characteristics affect thrombus formation and embolisation process. flow visualization technique incorporating photochromic dye was used to elucidate hemodynamic changes by stenting Inside the fusiform aneurysm models. Qualitative observation of flow field and measurement of wall shear rates were Performed at five aneurysm wall locations under pulsatile flow. Intraaneurysmal flow motion was reduced and sluggish vortical motion was maintained during late deceleration phase by stenting. Also wall shear rates were reduced and OSI's were increased in the stented model. These flow characteristics Provide hemodynamic environment favorable for thrombus formation and intimal hyperplasia. The results of this study show hemodynamic changes by stenting Promote thrombus formation and aneurysm embolisation.

• Journal of Korea Multimedia Society
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• v.16 no.6
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• pp.700-707
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• 2013

In this paper, we propose a non-rigid registration method of lung parenchyma in temporal chest CT scans using region binarization modeling and locally deformable model. To cope with intensity differences between CT scans, we segment the lung vessel and parenchyma in each scan and perform binarization modeling. Then, we match them without referring any intensity information. We globally align two lung surfaces. Then, locally deformable transformation model is developed for the subsequent non-rigid registration. Subtracted quantification results after non-rigid registration are visualized by pre-defined color map. Experimental results showed that proposed registration method correctly aligned lung parenchyma in the full inspiration and expiration CT images for ten patients. Our non-rigid lung registration method may be useful for the assessment of various lung diseases by providing intuitive color-coded information of quantification results about lung parenchyma.

• Transactions of the Korean Society of Mechanical Engineers A
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• v.23 no.6 s.165
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• pp.912-921
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• 1999

Shear stress acting on the arterial wall by blood flow is an important hemodynamic factor influencing blocking of blood vessel by thickening of an arterial wall. In order to study the effects of wall elasticity on the wall shear rate distribution in an artery-divergent graft anastomosis, a rigid and a elastic model are manufactured. These models are placed in a pulsatile flow loop, which can generate the desired flow waveform. Flow visualization method using a photochromic dye is used to measure the wall shear rate distribution. The accuracy of measuring technique is verified by comparing the measured wall shear rate in the straight portion of a model with the theoretical solution. Measured wall shear rates depend on the wall elasticity and flow waveform. The mean and maximum shear rate in the elastic model are lower than those in rigid model, and the decreases are more significant near the end of a divergent tube. The reduction of mean and maximum of wall shear rate in an elastic model are up to 17 percent.