• 한국산업융합학회 논문집
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• 제26권6_1호
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• pp.977-983
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• 2023

The tank uses a twin turbo diesel engine equipped with two turbocharger systems for high output. The main component of the turbocharger system is the turbine housing through which the exhaust flows. Turbine housing is manufactured through a sand casting process, taking into account the shape and material characteristics according to the environmental conditions in which it is used. Currently, turbine housing is imported, and local production is necessary. In this study, basic research was conducted to localize the turbine housing of a tank diesel turbo engine. Reverse engineering and finite element analysis of the imported turbine housing were performed. The prototype of the turbine housing was printed using FDM and PBF 3D printers. The prototype of the turbine housing printed with an FDM 3D printer has an overall appearance similar to 3D modeling, but the printed surface of the whorl part is rough. The prototype printed with the PBF 3D printer is completely identical to the 3D modeling, including the whorl part.

• 한국방사선학회논문지
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• 제12권6호
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• pp.737-743
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• 2018

전산화 단층촬영 장치의 정 도관리 항목 중 하나인 환자 피폭선량 피폭 시험은 의료법 제38조 특수의료장비 설치 및 운영에 따라 1년마다 측정을 시행하고 기록을 보관해야 한다. 선량 측정을 위해 사용되고 있는 CT-Dose 팬텀은 정확한 선량 측정이 가능하지만 가격이 비싸다는 단점이 있다. 따라서 본 연구를 통해 기존의 CT-Dose 팬텀을 3D프린터로 유사하게 제작하여 기존의 팬텀과 비교 분석하고 유용성을 알아보았다. 기존의 CT-Dose팬텀과 동일한 팬텀을 제작하기위해 PLA 필라멘트를 이용하여 FFF 방식의 3D프린터를 이용하였으며, CTDIw 값을 산출하기 위해 팬텀의 주변부와 중앙부에 이온챔버를 삽입하여 각 10번씩 측정하였다. 측정결과 주변부는 CT-Dose팬텀 $30.44{\pm}0.31mGy$, 중앙부는 $29.55{\pm}0.34mGy$ CTDIw값은 $30.14{\pm}0.30mGy$로 측정되었고, 3D프린터를 이용하여 제작된 팬텀은 주변부 $30.59{\pm}0.18mGy$, 중앙부 $29.01{\pm}0.04mGy$, CTDIw값은 $30.06{\pm}0.13mGy$로 측정되었다. SPSS 통계 프로그램의 Mann- Whiteney U-test를 사용하여 분석한 결과 중앙부의 결과 값은 통계적으로 유의한 차이가 있었지만 주변부와 CTDIw의 결과 값은 통계적으로 유의한 차이를 나타내지 않았다. 결론적으로, 3D프린터를 이용하여 제작된 팬텀으로 기존의 CT-Dose 팬텀과 유사한 선량측정 성능을 보였으며, 본 연구를 통해 3D프린터를 이용한 저비용의 팬텀 제작의 가능성을 확인할 수 있었다.

• 월간포장계
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• 통권296호
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• pp.77-80
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• 2017

• EDISON SW 활용 경진대회 논문집
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• 제5회(2016년)
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• pp.417-423
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• 2016

Develop a leg walking robot mechanisms with Janssen. Development item increases as the moving speed through the weight to set the leg to walk stably. The material is used the metal material was later used to produce a plastic using a 3D printer developed a walking robot with stable and lightweight material.

• 한국농공학회논문집
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• 제59권2호
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• pp.49-55
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• 2017

Recently climate change and urbananization have been increased surface runoff, resulting in flooding. Retention basins have been constructed to control urban flooding by reducing peak flow rate. Recently, the retention basin plays a role in controlling combined sewer overflows (CSOs) as well as urban flooding. In this study, the retention basin with a rotatable bucket was suggested and scale down experiments was performed for the optimum design of the retention basin. Scaled down model was produced using a 3D printer after it was designed as law of similarity. Two times for operating a rotary bucket is required to sweep out the sediments deposited on the bottom of the basin. Optimized dimensions for the retention basin were width of 5 m, height of 5 m, bucket radius of 0.5 m, and bottom slope of 5.0 %. It can be concluded that the results obtained from this study can be used to design the retention basin with a rotatable bucket which does not require energy to operate.

• 한국생산제조학회지
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• 제24권6호
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• pp.710-717
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• 2015

Projection stereolithography is an additive manufacturing method that uses beam projection to cure the photo-reactive resin used. The light source of a cross-section layer-form illuminates photo-curable resin for building a three-dimensional (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.

• 보존과학회지
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• 제31권2호
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• pp.131-145
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• 2015

문화재 보존처리는 손상된 문화재의 수명을 연장하고 그 가치를 재조명하는 실질적 수단으로서 높이 평가 받고 있다. 그러나 보존처리 과정은 대부분 보존처리자의 경험과 기술에 의한 수작업에 의존하고 있어 이에 따르는 많은 시간과 노력이 요구된다. 최근에는 문화재의 재질 특성과 형상에 따라 보다 정확하고 손쉽게 보존처리를 진행할 수 있는 방법을 채용할 수 있게 되었다. 즉, 지금까지 수작업으로 이루어지는 보존처리과정을 3D 프린터를 이용하여 컴퓨터상에서 구현된 입체 형상 데이터를 실물로 출력하는 방법을 이용하는 것이다. 먼저 문화재의 결손 부분을 컴퓨터상의 데이터로 구축한 다음 3D 프린터로 출력하여 결손 부분을 손쉽게 성형 및 가공 과정을 거치는 것이다. 3D 프린터 적용결과 반복적인 출력 및 디지털데이터의 형태 및 수치 조정이 가능하였으며, 다양한 소재를 활용한 여러 가지 복원재료로 부터 시험출력을 통하여 문화재 복원의 완성도를 향상시킬 수 있었다. 본 연구에서 도자기 결손부분 복원을 위한 3D 프린터 적용 시험을 위하여 현대 재현품인 청자칠보무늬향로와 차륜식토기 2점을 인위적으로 파손시켰다. 복원결과 수작업에 비해 작업시간 단축 및 정확한 형태의 재현 등에서는 좋은 효과를 나타내었다. 반면 정밀한 접합 및 표면 질감을 생생하게 표현하기 위해서는 약간의 2차적인 수작업이 필요하였다.

• 한국산업융합학회 논문집
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• 제22권3호
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• pp.293-301
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• 2019

Based on accurate image processing technology, a system for measuring displacement in ${\mu}m$ for drive error (position error, straightness error, flatness error) at a distance using parallel light and image sensor is developed, and a system for applying this technology development to a large 3D rapid prototyping machine and compensating in real time is developed to dramatically reduce the range of measurement error and enable intelligent 3D production of high quality products.

• ETRI Journal
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• 제42권2호
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• pp.272-281
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• 2020

Three-dimensional (3D) selfie services, one of the major 3D printing services, print 3D models of an individual's face via scanning. However, most of these services require expensive full-color supporting 3D printers. The high cost of such printers poses a challenge in launching a variety of 3D printing application services. This paper presents a stencil-based 3D facial relief creation method employing a low-cost RGBD sensor and a 3D printer. Stencil-based 3D facial relief is an artwork in which some parts are holes, similar to that in a stencil, and other parts stand out, as in a relief. The proposed method creates a new type of relief by combining the existing stencil techniques and relief techniques. As a result, the 3D printed product resembles a two-colored object rather than a one-colored object even when a monochrome 3D printer is used. Unlike existing personalization-based 3D printing services, the proposed method enables the printing and delivery of products to customers in a short period of time. Experimental results reveal that, compared to existing 3D selfie products printed by monochrome 3D printers, our products have a higher degree of similarity and are more profitable.

• 반도체디스플레이기술학회지
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• 제20권3호
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• pp.125-130
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• 2021

Scaffold is used to produce bio sensor. Scaffold is required high dimensional accuracy. 3D printer is used to manufacture scaffold. 3D printer can't detect defect during printing. Defect detection is very important in scaffold printing. Real-time defect detection is very necessary on industry. In this paper, we proposed the method for real-time scaffold defect detection. Real-time defect detection model is produced using CNN(Convolution Neural Network) algorithm. Performance of the proposed model has been verified through evaluation. Real-time defect detection system are manufactured on hardware. Experiments were conducted to detect scaffold defects in real-time. As result of verification, the defect detection system detected scaffold defect well in real-time.