• 한국분말야금학회:학술대회논문집
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• 한국분말야금학회 2006년도 Extended Abstracts of 2006 POWDER METALLURGY World Congress Part 1
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• pp.248-249
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• 2006

Direct Metal Laser Sintering (DMLS) has been utilized for prototype manufacturing of functional metal components for years now. During this period the surface quality, mechanical properties, detail resolution and easiness of the process have been improved to the level suitable for direct production of complex metallic components for various applications. The paper will present the latest DMLS technology utilizing EOSINT M270 laser sintering machine and EOSTYLE support generation software for direct and rapid production of complex shaped metallic components for various purposes. The focus of the presentation will be in rapid manufacturing of customized biomedical implants and surgical devices of the latest stainless steel, titanium and cobalt-chromium-molybdenum alloys. In addition to biomedical applications, other application areas where complex metallic parts with stringent requirements are being needed will be presented.

• Journal of Power Electronics
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• 제18권6호
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• pp.1627-1633
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• 2018

A constant voltage AC-DC converter based on digital assistant technology is proposed in this paper, which has rapid dynamic response capability. The converter operates in the PFM (Pulse Frequency Modulation) mode. According to the load state, the compensation current produced by the digital compensation module was injected into the CS pin to adjust the switching pulse width dynamically and improve the dynamic response. The control chip is implemented based on NEC $1{\mu}m$ 5V/40V HVCMOS process. A 5V/1.2A prototype has been built to verify the proposed control method. When the load jumps from idle to heavy, the undershoot time is only 7.4ms.

• 한국CDE학회논문집
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• 제12권1호
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• pp.50-57
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• 2007

In recent years, many robotics researches have been focused on developing human-friendly robots, that is, humanoid biped robots. The researches of humanoid robots include various areas such as hardware development, control of biped locomotion, artificial intelligence, human interaction, etc. The present work concerns the hardware development of a mid-size humanoid robot, BONOBO, focusing on rapid development of outer body parts with integrated application if CAD/CAM/CAE/RP. Most parts are three-dimensionally designed using 3D CAD, and effectively connected with CAE analyses using both kinematic simulation and structural analysis. In order to reduce lead time and investment cost for parts developments, Rapid Prototyping (RP) and CAM are selectively utilized for manufacturing body parts. These master parts are then replicated using the vacuum casting process, from which we can obtain plastic parts repeatedly. Through this integrated approach, the first prototype of BONOBO can be successfully developed with relatively low time and investment costs.

• 한국정밀공학회지
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• 제16권1호통권94호
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• pp.95-107
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• 1999

The design models of a new product in general are created using clay models or wooden mock-ups. The reverse engineering(RE) technology enables us to quickly create the CAD model of the new product by capturing the surface of the model using laser digitizers or coordinate measuring machines. Rapid prototyping (RP) is another technology that can reduce the product development time by fabricating the physical prototype of a part using a layered manufacturing technique. In reverse engineering process, however, the digitizer generates an enormous amount of point data, and it is time consuming and also inefficient to create surfaces out of these data. In addition, the surfacing operation takes a great deal of time and skill and becomes a bottleneck. In rapid prototyping, a faceted model called STL file has been the industry standard for providing the CAD input to RP machines. It approximates the CAD model of a part using many planar triangular patches and has drawbacks. A novel procedure that overcomes these problems and integrates RE with RP is proposed. Algorithms that drastically reduce the point clouds data have been developed. These methods will facilitate the use of reverse engineered geometric data for rapid prototyping, and thereby will contribute in reducing the product development time.

• 한국소성가공학회:학술대회논문집
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• 한국소성가공학회 2001년도 춘계학술대회 논문집
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• pp.16-19
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• 2001

Rapid Prototyping (RP) and Rapid Tooling (RT) were introduced to reduce time-to-market and cost by shortening not only the development phase but also the production phase of the manufacturing process. RP generally builds up a prototype layer by layer, rapidly generating a fully three-dimensional free form shape. RT enables the manufacture of production tools. The integration of RP and RT has the potential for rapid net shaping of thee-dimensional parts, which have geometrical complexity. In this study, net shaping techniques for making three-dimensional parts using RP and RT are described and a sample part are shown. A three-dimensional metal part is manufactured by a new RP process, Variable Lamination Manufacturing by using Expandable Polystyrene Foam (VLM-S), and its application to RT for making a clover punch. In addition, we discussed the technology fusion between metal forming md RP/RT.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2005년도 추계학술대회 논문집
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• pp.334-337
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• 2005

The objective of this research works is to propose a rapid development methodology of small size deep drawing tools for electronic parts utilizing the technology combination of CAE and RP/RT. The technology is applied to the development of deep drawing tools with a drain shape. The final surface of tools is obtained from the evaluation of the formability using the CAE. In order to manufacture the physical prototype of tools fer try-out terming, several fabrication experiments are carried out for three types of rapid tool manufacturing technology. Through the fabrication experiments, the acceptable rapid manufacturing technologies of deep drawing tools with a small size have been proposed.

• 한국콘텐츠학회논문지
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• 제11권8호
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• pp.77-87
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• 2011

기술의 발전과 함께 매해 쏟아져 나오는 새로운 플랫폼들은 콘텐츠 생산자들에게 창의적이고 혁신적인 콘텐츠를 개발할 수 있는 새로운 기회를 제공하고 있다. 이러한 현상은 디지털 미디어 콘텐츠 분야를 전공하는 학생들에게도 중요한 영향을 미쳐 콘텐츠 개발 시 새로운 기술 기반의 플랫폼을 활용해 봄으로써 그들에게 보다 새롭고 유익한 배움의 기회를 제공한다. 본 논문에서는 최근 디지털 미디어분야 학생들에게 주목받고 있는 주요기술로서 가상현실 디스플레이, 동작인식부, 물리엔진 그리고 체감형 인터페이스 기술을 제시하고, 이 4가지 기술을 사용하는 통합 플랫폼을 개발하여 콘텐츠 개발 시 보다 쉽고 편리하게 구현할 수 있도록 설계하였다. 또한 디지털 콘텐츠 개발 교육을 위한 목적으로서 플랫폼의 실용성을 검토하고자 제안한 플랫폼을 기반으로 4개의 프로토타입 콘텐츠를 개발하고 플랫폼의 활용성을 평가하였다. 사용자 평가결과 시스템의 기능성, 사용성, 유용성, 만족도 및 선호도 모두 전반적으로 높게 나타났으며 이 같은 플랫폼의 활용도는 학생들에게 쉽고 빠르게 프로토타입 콘텐츠(Rapid prototype)를 제작 할 수 있는 환경을 조성해 주어 창의적인 미디어 콘텐츠 연구에 있어 긍정적인 영향을 줄 것으로 사료된다.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2000년도 춘계학술대회 논문집
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• pp.824-828
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• 2000

As production cycle has become more and more shorter, the demand of rapid prototyping technology has increased largely. There are many methods for rapid prototyping technology, such as SLA. SLS, FDM. INK JET, LOM and so on. Of all methods, SLA has been most widely used for fabricating precision parts. But products manufactured by this method have limitation of single color and single material. So the principal purpose of this study is to overcome the limit of single color product. If the internal structure of manufactured product is visible with multi-color characteristic, it is possible to check easily the designed model with reality. In order to give multi-color characteristic to the product, photocurable resin mixed with pigment is used in this study. First, transparency of photocurable resin without pigment is evaluated, and then color characteristic and curing characteristic of the mixture is evaluated changing mixing ratio. Through the basic experiments, it becomes possible to fabricate multi-color 3D prototype without assembly.

• 정보처리학회논문지D
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• 제12D권7호
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• pp.957-964
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• 2005

웹 환경이 급변함에 따라 인간과 컴퓨터간의 복잡한 상호작용을 지원하기 위한 인터페이스에 대한 설계가 필요하게 되었다. 본 논문에서는 사용자 인터페이스의 품질 향상을 위하여 객체 모델링 기법을 제시한다. 사용자 인터페이스의 가시적 응집도 향상을 위하여 비즈니스 이벤트객체 모델링, 태스크 객체 모델링, 트랜잭션 객체 모델링, 폼 객체 모델링과 같은 4 가지의 비즈니스 이벤트 객체를 제안한다. 본 논문에서 제시하는 4단계 설계를 통하여 사용자 인터페이스 프로토타입의 가시적 응집도를 향상시킬 수 있다. 이것은 비즈니스 이벤트의 가시적 응집도를 향상시킬 수 있도록 하고, 비숙련된 설계자도 향상된 사용자 인터페이스 프로토타입을 개발할 수 있도록 한다 또한 비즈니스 태스크의 이해도를 증진시키고 프로토타입 시스템 개발 회수를 줄일 수 있다.

• 마이크로전자및패키징학회지
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• 제6권4호
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• pp.15-22
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• 1999

일반적으로 빌드업 다층 인쇄회로기판은 에칭, 도금등의 습식공정에 의해 제작이 이루어지므로 많은 장비와 많은 시간이 필요하게 된다. 이러한 습식공정은 양산에는 적합하지만 개발단계에서는 그리 적합하지 않은 방법이다. 본 연구에서는 스크린 인쇄기술을 도입하여 빌드업 다층 인쇄회로기판을 제작하여 보았다. 절연성 재료로는 광경화성수지 또는 열경화성수지를 사용하였으며 전도성 재료로는 전도성 페이스트를 사용하였다. 층간의 전기적 연결을 담당하는 비아와 회로를 형성하기 위해 스크린 인쇄공정을 통해 전도성 페이스트를 인쇄 하였다. 이러한 방법을 통해 제품의 개발 단계에서 기존의 빌드업 다층 인쇄회로기판 제작 공정과 비교하여 좀더 효율적인 방법을 제시하였다.