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박삼진 한국 CAD/CAM학회 1999 한국CDE학회 논문집 Vol.4 No.1
One of the non-photorealistic rendering method, a drawing technique which uses only fine curves and dashed lines, is widely employed in banknotes and post stamps printing. Engraving of the curves and lines are traditionally performed by human engravers which leads to low productivity in printing preparation. As an effort to improve productivity and quality, a drawing automation method which can easily produce a portrait composed of vector data for laser or chemical engraving is proposed. The method shows that it is possible to draw a portrait by controlling the width and length of predefined fine lines according to the gray scales at the end points of each fine lines. A gradually controlled weighting factor method is proposed in addition to the authors previous works to prevent undesirable boundaries in an identical texture region. User interface functions of a commercial CAD system are heavily employed to exploit the presented method.
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김대현,김보현,편영식,최병규 한국 CAD/CAM학회 1998 한국CDE학회 논문집 Vol.3 No.3
분석 투과전자현미경을 이용 ZnO바리스터의 계면을 관찰하였다. 바리스터 특성의 조성물에서 Bi_(2)O_(3) 의 함량을 바꾸어 바리스터를 제조하여 이들의 전기적 특성을 측정하였고 또한 입계구조와 전기적 특성과의 관련성을 규명하기 위해 입계에 대해 분석 투과전자현미경을 이용 입계를 관찰하였다. 전기적 특성의 변화는 Bi_(2)O_(3) 의 함량 변화에 민감하였으나 입계구조의 변화에서는 분석 범위내에서 변화를 관 찰 할 수 없었다. Even though most die-maker are using CAD/CAM systems for NC tool-path generation, "frontend" CAD/CAM technologies have not been fully adapted to sculptured surface machining(SSM) nor are sufficiently utilized in die shops. This gap between die-making industry and CAD/CAM community persists mainly because of the lack of a SSM-process model through which the two groups communicate with each other. Proposed in this paper is a model of SSM-processes which is built around the concepts of machining stages, unit machining operations, and each machining stage is decomposed into a sequence of unit machining operations(UMOs). Identified in the paper are five machining stages and 17 types of UMO. Based on the framework of the proposed model, an example of inner-panel stamping-die machining processes is described in detail.
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