• 대한공업교육학회지
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• v.33 no.2
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• pp.259-272
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• 2008

In order to improve the productivity and quality of boat's mold in leisure boat industry, the development of modelling and machining technology of leisure boat's plug is strongly required. The traditional lines drawing approach by hand required the designer to both create fair curves and to make sure that the curves matched up to each other in the three main drawing views: profile, plan, and section. However, one will find when studying lines drawings in books that the curves might look smooth and fair, but the lines do not agree exactly in the three views. Therefore, the 2 dimensional drawing data of leisure boat are transformed using 3 dimensional design s/w and CAM s/w. In addition, the leisure boat is designed with a 3 dimensional s/w. The NC cutting data are generated by the CAM s/w. The surface characteristics of machined surface are investigated at various cutting conditions such as spindle speed, feed speed, and cutting material.

• Proceedings of the Korea Multimedia Society Conference
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• 2003.11b
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• pp.605-608
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• 2003

신발의 디자인과 설계는 기술의 부족으로 과거 수십년 동안 3차원 실물을 대상으로 직접 이루어지지 못했다. 불과 몇년 전까지만 해도 신발 설계는 신발모형을 본뜬 근사적인 2차원 Last상에서 숙련된 전문 신발 디자이너의 손에 의해서만 가능한 일이었으나 최근에는 컴퓨터 S/W와 그래픽스 기술의 빠른 성장에 힘입어 3차원 Last를 대상으로 직접 신발을 설계하는 기술들이 개발되어 보다 효율적인 신발 설계가 가능하게 되었다. 그러나 아직 국내에서는 이러한 기술에 대한 연구, 개발은 미미한 수준이다. 본 논문에서는 3차원 Last를 2차원 평면으로 펼쳐서 양 차원간의 기하정보를 적절하게 Mapping 시키고 3차원 Last상에 직접 스타일 라인을 생성, 설계한 다음 이를 인터렉티브하게 2차원 패턴으로 생성해내는 3차원 신발 캐드 시스템을 구현 하였다.

• Korean Journal of Computational Design and Engineering
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• v.10 no.4
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• pp.293-302
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• 2005

The research focused quantitative comparisons of protocols occurring in the architectural massing process using two different tools, three-dimensional(3D) modeler and traditional design tools, to aid architectural massing education. Through the protocol analysis from some experiments, the research identified the following conclusions: 1) Usage of traditional tools produced much higher protocol rate in proposing solution, evaluating proposed solution, explicitness of strategies. This result seemed to be from convenience of traditional tools causing faster visual cognitive cycle. 2) Usage of 3D modeler produced much higher protocol rate concerning attempts of making design vocabulary. The result indicated 3D modeler has relatively effective functions for mass generation and orientation, however it still has some weaknesses on display interface which cause designer's lower idea generations compared to traditional design tools.

• Proceedings of the KIEE Conference
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• 2006.07d
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• pp.2153-2154
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• 2006

MR imaging에서 RF pulse에 의한 Spin들의 이동과 dephase, rephase 되는 모양을 Spin visualization을 사용하면 직관적으로 이해할 수 있다. 다양한 각도의 RF pulse 가 여러 번 가해지면, spin echo 외에도 stimulated echo, "eight-ball" echo 등이 나타나기 때문에 직관적으로 echo들을 이해하기가 어려워진다. Spin에 RF pulse가 가해졌을 때, 기존의 2차원의 Profile로 spin들의 상태를 보는 것보다 3차원 공간상에서 spin들의 상태를 살펴봄으로써, 좀 더 쉽게 MR 신호를 이해할 수 있다. 특히 고자장에서 SAR 문제 때문에 낮은 각도의 RF pulse 를 사용하여 영상을 해야 하기 때문에 spin visualization은 새로운 영상 방법을 이해하거나 디자인하는데 중요하다.

• Journal of the Korean Academy of Esthetic Dentistry
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• v.30 no.2
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• pp.71-90
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• 2021

The virtual patient dataset is a collection of diagnostic data from various sources acquired from a single patient into a coordinate system of three-dimensional visualization. Virtual patient dataset makes it possible to establish a treatment plan, simulate various treatment procedures, and create a treatment planning delivery device. Clinicians can design and simulate a patient's smile on the virtual patient dataset and select the optimal result from the diagnostic process. The selected treatment plan can be delivered identically to the patient using manufacturing techniques such as 3D printing, milling, and injection molding. The delivery of this treatment plan can be linked to the final prosthesis through mockup confirmation through provisional restoration fabrication and delivery in the patient's mouth. In this way, if the diagnostic data superimposition and processing accuracy during the manufacturing process are guaranteed, 3D digital smile design simulated in 3D visualization can be accurately delivered to the real patient. As a clinical application method of the virtual patient dataset, we suggest a decision-making method that can exclude occlusal adjustment treatment from the treatment plan through the digital occlusal pressure analysis. A comparative analysis of whole-body scans before and after temporomandibular joint treatment was suggested for adolescent idiopathic scoliosis patients with temporomandibular joint disease. Occlusal plane and smile aesthetic analysis based on the virtual patient dataset was presented when treating patients with complete dentures.

• Journal of the Korean Institute of Gas
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• v.8 no.2 s.23
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• pp.15-27
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• 2004

The purpose of this paper is to improve the performance of Polymer electrolyte fuel cell(PEMFC) by studying the channel dimension of bipolar plates using commercial CFD program 'Fluent'. Simulations are done ranging from 0.5 to 3.0mm for different size in order to find the channel size which shoves the highst hydrogen consumption. The results showed that the smaller channel width, land width, channel depth, the higher hydrogen consumption in anode. When channel width is increased, the pressure drop in channel is decreased because total channel length Is decreased, and when land width is increased, the net hydrogen consumption is decreased because hydrogen is diffused under the land width. It is also found that the influence of hydrogen consumption is larger at different channel width than it at different land width. The change of hydrogen consumption with different channel depth isn't as large as it with different channel width, but channel depth has to be small as can as it does because it has influence on the volume of bipolar plates. however the hydrogen utilization among the channel sizes more than 1.0mm which can be machined in reality is the most at channel width 1.0, land width 1.0, channel depth 0.5mm and considered as optimum channel size. The fuel cell combined with 2cm${\times}$2cm diagonal or serpentine type flow field and MEA(Membrane Electrode Assembly) is tested using 100W PEMFC test station to confirm that the channel size studied in simulation. The results showed that diagonal and serpentine flow field have similarly high OCV and current density of diagonal (low field is higher($2-40mA/m^2$) than that of serpentine flow field under 0.6 voltage, but the current density of serpentine type has higher performance($5-10mA/m^2$) than that of diagonal flow field under 0.7-0.8 voltage.