• 한국항해항만학회:학술대회논문집
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• 한국항해항만학회 2007년도 추계학술대회 및 제23회 정기총회
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• pp.129-130
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• 2007

해양 분야에서는 현재 해양 생태계 모델이나 수질모델 그리고 해수 유동모델과 같은 다양한 모델들이 사용되어 지고 있으며 이러한 해양 모델들의 결과 값은 사용자가 한눈에 알아보기 어려운 수치 데이터의 나열로서 출력되어 지고 있다. 본 논문에서는 현재의 분석하기 어려운 모델링결과 데이터를 보다 효과적으로 분석하기 위해 GIS 의 기법을 적용하여 이 데이터를 보다 직관적이고 가시적인 형태로 변환하고 표현하는 기술을 개발, 적용하였다.

• 한국멀티미디어학회논문지
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• 제15권10호
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• pp.1264-1272
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• 2012

3차원 볼륨렌더링 방법은 인체의 외형뿐만 아니라 내부의 모습도 투과하여 보여줄 수 있기 때문에 의료영상 분야에서 널리 사용된다. 기존의 의료영상 장비는 볼륨렌더링 방법을 이용하여 다양한 3차원 영상을 제공하고 있다. 최근 의료영상 분야에서는 휴대성의 장점을 가진 스마트 기기를 도입함으로써 기존 의료영상 분야의 결과물을 의사와 환자들 사이에서 소통이 원활하게 하려는 연구가 활발히 진행되고 있다. 본 논문에서는 비교적 저 사양인 휴대용 스마트 기기에서 3차원 볼륨데이터를 가시화하기 위하여 2차원 텍스쳐를 활용하는 방법을 제안하고 다양한 2차원, 3차원 진단영상을 제공하는 휴대용 의료영상 가시화 시스템을 제안한다.

• Structural Engineering and Mechanics
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• 제43권3호
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• pp.395-410
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• 2012

The visualizing energy flow and control in vibrating stiffened plates with a cutout are studied using finite element method. The vibration intensity, vibration energy and strain energy distribution of stiffened plates with cutout at different excitation frequencies are calculated respectively and visualized for the various cases. The cases of different size and boundaries conditions of cutouts are also investigated. It is found that the cutout or opening completely changes the paths and distributions of the energy flow in stiffened plate. The magnitude of energy flow is significantly larger at the edges near the cutout boundary. The position of maximum strain energy distribution is not corresponding to the position of maximum vibrational energy. Furthermore, the energy-based control using constrained damping layer (CDL) for vibration suppression is also analyzed. According to the energy distribution maps, the CDL patches are applied to the locations that have higher energy distribution at the targeted mode of vibration. The energy-based CDL treatments have produced significant attenuation of the vibration energy and strain energy. The present energy visualization technique and energy-based CDL treatments can be extended to the vibration control of vehicles structures.

• 한국분무공학회지
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• 제22권3호
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• pp.109-115
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• 2017

The aim of this study is to investigate the effect of physical properties of fuels on spray characteristics in the gasoline direct injection system. Injection rate, spray visualization, and spray pattern experiments were performed to analyze the spray characteristics of ethanol, gasoline, and ethanol/gasoline blends. We measured injection rate of each fuel via the Bosch method. The spray visualization experiment was also carried out at atmospheric pressure using a high-speed camera. Finally, the average of drop surface area per unit volume was measured using the optical patternator. The experimental results from Bosch method showed that peak injection rate increased when the volume fraction of ethanol increased. In addition, higher viscosity of ethanol than that of gasoline leads to longer injection delay. At the initial injection region before reaching 0.8 ms, the spray tip penetration becomes longer as increasing the volume fraction of ethanol, but reversely shorter after 0.8 ms. It was found that ethanol makes spray angle become larger. The surface area per unit volume of the drop was decreased as the distance from the injection tip or the concentration of the gasoline increased.

• 한국정밀공학회지
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• 제23권9호
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• pp.134-141
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• 2006

Surface deflections have a great effect on the external appearance of automobiles. Usually, they are occurred on large flat panels containing sudden shape changes and of very small size about $\pm$30$\sim$300$\mu$m. Since the current numerical method is not sufficient for predicting these defects, the correction of these defects still depends on trial and error, which requires a great deal of time and expense. Consequently, developing the numerical method to predict and prevent these defects is very important far improving cosmetic surface qualities. In this study, an evaluation system that can analyze surface deflections using numerical simulation and a visualization system are reported. To calculate the surface deflections numerically, robust algorithms and simulation methodologies are suggested and to visualize them quantitatively, the curvature variation algorithm is proposed. To verify the developed systems, the experimental die of the handle portion of exterior door is analyzed. The results showed that the experimental and simulational visualization are in good agreement. Compensation methods to correct the surface deflections are also tested. The evaluation system proposed in this paper could be used to predict and minimize the occurrence of surface deflections in die manufacturing.

• 한국정보과학회논문지:시스템및이론
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• 제32권6호
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• pp.314-323
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• 2005

본 논문은 전장지역에서 벌어지는 공중작전에 대한 상황의 자료를 통합하여 3차원으로 가시화 함으로써 공중작전의 최고결정권자가 올바른 상황인식 및 지휘결정을 할 수 있게 지원하는 시스템을 제안한다. 공중작전 상황판단을 위한 다양한 자료들, 레이더 항적정보, 비행계획 데이타베이스, 지도 및 위성사진 정보 둥을 하나의 자료로 통합하여 3차원으로 가시화 시킴으로써, 작전의 최고 결정권자가 한 순간에 종합적인 작전 결정을 할 수 있는 정보를 지원하는 시스템이다. 대량의 데이타를 종합적이고 체계적으로 가시화 하기 위하여 Out-of-Core 방법을 사용함으로써 휴대용 노트북에서도 운용이 가능함을 실험을 통하여 보여 주고 있으며, 공군의 공중작전 수행 시 상황인식을 지원하는 시스템으로 활용될 수 있는 가능성을 보이고 있다.

• 제어로봇시스템학회논문지
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• 제22권11호
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• pp.877-882
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• 2016

Disaster robots have accepted tele-operation in order to share the intelligence of human operators and robot systems. Virtual wall is one of the tele-operation technology to support recognition of human operator. If the virtual wall can block the robot from dangers, the operator will feel comfortable and can concentrate on fundamental missions. In this paper, we proposes and compares three methods for virtual wall visualization in tele-operation using 3D reconstruction. First is a virtual wall visualized only with edges. A wall filled with transparent color is the second method. Finally, third method is a texture-mapped virtual wall. In the experiments, we discuss their merits and demerits in view of robot tele-operation.

• International journal of advanced smart convergence
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• 제7권3호
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• pp.130-139
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• 2018

This study is to analyze the relationship between character and human semantic production through research on character visualization artworks and to develop a creative platform that visually expresses the formative and semantic dynamics of characters using the results will be. The 3D spatial interaction system using the character visualization proposed generates the transformation of the character in real time using the interaction with user and the deconstruction of the character structure. Transformations of characters including the intentions of the viewers provide a dynamic visual representation to the viewer and maximize the efficiency of meaning transfer by producing various related meanings. The method of dynamic deconstruction and reconstruction of the characters provided by this system creates special shapes that viewers cannot imagine until now and further extends the interpretation range of the meaning of the characters. Therefore, the proposed system not only induces an active viewing attitude from viewers, but also gives them an opportunity to enjoy watching the artwork and demonstrate creativity as a creator. This system induces new gestures of the viewer in real time through the transformation of characters in accordance with the viewer''s gesture, and has the feature of exchanging emotions with viewers.

• Archives of Plastic Surgery
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• 제37권4호
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• pp.499-530
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• 2010

Purpose: Lateral osteotomy is an essential step in the correction of nasal bony asymmetry. Direct visualization allows accurate repositioning of the nasal bones compared to blind techniques, which require precision and manual dexterity. We propose direct visualization procedures in open corrective rhinoplasty. Methods: The technique was used on 16 patients. All patients underwent open rhinoplasty with a columellar incision. The marginal incisions were extended on either side to allow access to the piriform aperture. A double hook was used to caudally retract the lower lateral cartilages and the fibrous connections between the upper and lower lateral cartilages were released until the piriform aperture was visualized. Through the incision, lateral osteotomy was performed using a reciprocating saw at that time with direct visualization. Additional procedures including augmentation rhinoplasty, hump resection, septoplasty and tip plasty were performed simultaneously. Results: This method provided excellent exposure to the lateral nasal bones and allowed the lateral osteotomy to be carried out precisely using the reciprocating saw. Conclusion: This extended open rhinoplasty method is suitable for most individuals, allowing a wide surgical field.

• 대한설비공학회지:설비저널
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• 제17권4호
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• pp.382-394
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• 1988

Dynamic characteristics of thermally-forced stratification process in a square enclosure with a linear temperature profile at the side walls have been investigated through flow visualization experiment and numerical analysis. The experiment was performed on air with the Rayleigh numbers of order $10^5$. A particle tracer method is used for the flow visualization and to obtain a sudden linear temperature profile at the side walls copper blocks which already have a linear temperature profile are come into contact with the thin copper plates of the test section. Immediately a meridional circulation is developed and heat transfer takes place from the wall to the interior region by circulation of fluid and finally a thermal stratification is achieved. In the numerical study, QUICK scheme for convective terms, SIMPLE algorithm for pressure correction, and the implicit method for the time marching are adopted for the integration of conservation equations. Comparison of flow visualization and numerical results shows that the developing flow patterns are very similar in dynamic nature even though there is a time lag due to the inevitable time delay in setting up a linear temperature profile. For high Rayleigh numbers, the oscillatory motion is likely to take place and stratified region is extended. However, initial temperature adjustment process is much slower than that for low Rayleigh numbers.