ARTICLE INFO ABSTRACTArticle history:Projection stereolithography is an additive manufacturing method that uses beam projection to cure the photo-reactive resin used. The light source of a crosssection layer-form illuminates photo-curable resin for building a threedimensional (3D) model. This method has high accuracy and a fast molding speed because the processing unit is a face instead of a dot. This study describes a Scalable Projection Stereolithography 3D Printing System for improving the accuracy of the stereolithography. In a conventional projection 3D printer, when printing a small sized model, many pixels are not used in the projection or curing. The proposed system solves this problem through an optical adjustment, and keeps using the original image as possible as filling the whole projection area. The experimental verification shows that the proposed system can maintain the highest level of precision regardless of the output size. 본 연구에 사용된 적층 가공 방식은 SLA(stereolithography apparatus) [4] 로 광경화성 수지(photo-curable resin)와 광원을 이 용하는 방식이다. 광경화성 수지는 일반적으로 액체 상태에 존재 하다가 자외선이나 전자선 등의 빛에너지에 의해 경화가 되어 고

ARTICLE INFO ABSTRACTArticle history:A control system for ultrasonic spray pyrolysis deposition was developed that can coat a large size glass panel with a transparent conductive oxide. It consists of several ultrasonic atomizer devices to cover a large area and a host computer for individually controlling the devices. The sub-controller in an ultrasonic atomizer device can adjust the flow rate of the atomized conductive oxide gas by setting the flow rate of the solution and regulating the level of the solution in the tank. To construct a feedback control loop for level regulation, a level sensor that utilized an infrared distance sensor and an electric circuit for adjusting the ultrasonic oscillator were developed. The host program was also developed, which can monitor and control the sub-controllers. A proportional-integral controller was developed for a simplified model, and its operation was verified through an experiment. 과 초음파 분무장치(ultrasonic atomizer)를 이용하는 방식 [6] 이 있다.