• 한국전자통신학회논문지
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• 제15권4호
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• pp.759-764
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• 2020

4차 산업혁명에 맞춰 제조·생산의 패러다임 또한 변경되고 있는 상황에서 인더스트리 4.0에 대한 사회적 요구 및 방향은 이미 되돌릴 수 없으며, 그로 인하여 3D프린팅 기술의 확장성과 범용성이 주목받고 있다. 3D 프린터는 제품 개발 비용 감소를 위한 목적으로 개발된 기술로, 최근 3D 프린터 기술특허가 만료되면서 관련 기술이 공개되었고 이를 적용한 다양한 기술이 연구 개발되고 있으며 이로 인해 다양한 특이점이 발견 및 보완되고 있다. 이에 본 연구에서는 3D 프린터 사용에 있어 오프라인에서 기계를 직접 조정하고, 모델링 데이터의 직접 입력을 통해 3D프린팅 시작해야 하는 현재 출력방식에 대한 불편함을 보완하기 위해 다중 3D 프린터에 대한 실시간 온라인 출력요청 및 정상적인 출력물을 기대할 수 있는 모니터링 기능 그리고 다중 3D 프린터에 대한 온라인 실시간 원격관리 기능을 수행하기 위해 IoT 시스템에 대한 설계를 제안한다.

• 대한치과기공학회지
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• 제41권4호
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• pp.287-293
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• 2019

Purpose: To evaluate the accuracy of the 3D printed die models and to investigate its clinical applicability. Methods: Stone die models were fabricated from conventional impressions(stone die model; SDM, n=7). 3D virtual models obtained from the digital impressions were manufactured as a 3D printed die models using a 3D printer(3D printed die models;3DM, n=7). Reference model, stone die models and 3D printed die models were scanned with a reference scanner. All dies model dataset were superimposed with the reference model file by the "Best fit alignment" method using 3D analysis software. Statistical analysis was performed using the independent t-test and 2-way ANOVA (α=.05). Results: The RMS value of the 3D printed die model was significantly larger than the RMS value of the stone die model (P<.001). As a result of 2-way ANOVA, significant differences were found between the model group (P<.001) and the part (P<.001), and their interaction effects (P<.001). Conclusion: The 3D printed die model showed lower accuracy than the stone die model. Therefore, it is necessary to further improve the performance of 3D printer in order to apply the 3D printed model in prosthodontics.

• 대한방사선기술학회지:방사선기술과학
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• 제43권6호
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• pp.453-460
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• 2020

The price of the Brain phantom (Hoffman 3D brain phantom) used in nuclear medicine is quite expensive, it is difficult to be purchased by a medical institution or an educational institution. Therefore, the purpose of present research is to produce a low-price 3D brain phantom and evaluate its usefulness by using a 3D printer capable of producing 3D structures. The New 3D brain phantom consisted of 36 slices 0.7 mm thick and 58 slices 1.5 mm thick. A 0.7 mm thick slice was placed between 1. 5 mm thick slices to produce a composite slice. ROI was set at the gray matter and white matter scanned with CT to measure and compare the HU, in order to verify the similarity between PLA which was used as the material for the New 3D brain phantom and acrylic which was used as the material for Hoffman 3D brain phantom. As a result of measuring the volume of each Phantom, the error rate was 3.2% and there was no difference in the signal intensity in five areas. However, there was a significant difference in the average values of HU which was measured at the gray and white matter to verify the similarity between PLA and acrylic. By reproducing the previous Hoffman 3D brain phantom with a 100 times less cost, I hope this research could contribute to be used as the fundamental data in the areas of 3D printer, nuclear medicine and molecular imaging and to increasing the distribution rate of 3D brain phantom.

• 한국기계가공학회지
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• 제16권2호
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• pp.94-101
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• 2017

Recently, the small quantity batch production method has come into the spotlight as there are more plastic processing methods. At the same time, the 3D printer market has become globally widespread due to expired 3D printer patents. In particular, the FDM method is widely used for cheap products and materials. However, the FDM scheme is not as good as the injection molding method for quality and strength. This study investigated the effect of the internal filling and strength according to layer thickness to search for the optimum printing of the factors (infill and layer thickness) that determine the strength of the model.

• 대한지구과학교육학회지
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• 제15권1호
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• pp.62-75
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• 2022

이 연구에서는 2015 개정 과학과 교육과정 중 '태양'에 관한 내용 요소를 중심으로, 3D 프린터를 활용한 체험형 STEAM(Science, Technology, Engineering, Arts & Mathematics) 프로그램을 개발하고, 이에 대한 효과성을 알아보고자 무선 표집된 2개의 중학교 77명의 학생들에게 이를 적용하여 창의적 문제해결력, STEAM 태도 및 수업만족도를 분석하였다. 이 연구의 결과는 다음과 같다. 첫째, 3D프린터를 활용하여 태양촉각모델을 제작하고 시각장애 체험을 통해 학생들이 체험 위주의 적극적인 학습이 가능하도록 프로그램을 개발하였다. 둘째, STEAM 태도 검사의 사전·사후 점수 차에 의한 대응표본 t 검정에서는 '소통', '유용성·가치 인식' 구인을 제외한 '흥미', '배려', '자아 개념', '자아 효능감', '이공계 진로선택' 구인에서 유의미한 통계적 검정 결과(p< .05)를 얻었다. 셋째, 3D프린터 활용 시각장애 중심의 체험형 STEAM 프로그램 적용 후에 실시한 만족도 검사에서는 하위구인들의 평균값의 범위가 3.66 ~ 3.97로, 전반적으로 수업에 대한 긍정적인 반응을 나타내었다.

• 융합정보논문지
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• 제10권10호
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• pp.47-52
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• 2020

일반적인 평판 프린터 시스템은 PC와 전용 S/W로 구성되어 사용에 불편함이 존재한다. 결국, 평판 프린터 시스템 구성의 간소화, 스마트화 등을 통해 다양한 형태의 프린팅을 쉽고 편리하게 사용할 수 있는 기술이 필요하다. 즉, 한 대의 프린터로 여러 종류의 소재에 인쇄가 가능하며, 다양한 형태의 상품을 인쇄할 수 있는 다입체 프린터에 대한 수요가 증가하고 있다. 따라서, 본 논문에서는 Head Encoder/Trigger 제어를 이용하여 다입체 인쇄가 가능한 평판 프린터 시스템을 개발하였다. 이를 위해, 평판 프린터 내부 모듈을 입력 형태 감지 센서를 연계시키고, 별도의 메인 콘트롤러를 통해 프린터의 Head Encoder와 Head Trigger 신호에 의해 모든 동작 상태를 제어하는 평판 프린터를 개발하였다. 이를 통해, IoT 기술의 발전 및 보급의 확산으로 산업 전반에 걸쳐 스마트 환경의 프린터 제어가 발전된 형태로 확대될 것이며, 향후 3D 프린팅 산업 발전에 기여할 것으로 기대된다.

• 대한치과기공학회지
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• 제42권1호
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• pp.35-41
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• 2020

Purpose: The purpose of this study was to evaluate the accuracy of the DLP 3D printer by conducting 3-dimensional assesment of resin provisional restorations. Methods: The first premolar of the maxillary was prepared for the abutment. The abutment was scanned by using a scanner. The provisional restoration was designed by using CAD software. A total of 16 resin provisional restorations were produced using ZD200 and Veltz DLP 3D printer. Scanning was done of resin provisional restorations and 3-dimensional measurement was conducted for accuracy. The mean (SD) of RMS was reported for each group. Independent t-test was used to assess the statistical significance of the results. All analyses were done using SPSS 22.0. Results: The mean ± SD of RMS value for the accuracy of the resin provisional restorations that was fabricated by using ZD200 and Veltz DLP 3D printer were 50.85.±4.64㎛ and 70.33±6.31㎛. Independent t-test showed significant differences between groups(p<0.001). Conclusion: The resin provisional restorations made with DLP 3D printers showed clinically acceptable accuracy.

• 한국기계가공학회지
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• 제18권7호
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• pp.83-89
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• 2019

In the conventional casting and forging method, there is a disadvantage that a mold is an essential addition, and a production cost is increased when a small quantity is produced. In order to overcome this disadvantage, a metal 3D printing production method capable of directly forming a shape without a mold frame is mainly used. In particular, overseas research has been conducted on various materials, one of which is a metal printer. Similarly, domestic companies are also concentrating on the metal printer market. However, In this case of the conventional metal 3D printing method, it is difficult to meet the needs of the industry because of the high cost of materials, equipment and maintenance for product strength and production. To compensate for these weaknesses, printers have been developed that can be manufactured using sand mold, but they are not accessible to the printer company and are expensive to machine. Therefore, it is necessary to supply three-dimensional casting printers capable of metal molding by producing molds instead of conventional metal 3D printing methods. In this study, we intend to reduce the unit price by replacing the printing method used in the sand casting printer with the FDM method. In addition, Ag paste is used to design the output conditions and enable ceramic printing.

• 한국멀티미디어학회논문지
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• 제19권8호
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• pp.1619-1625
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• 2016

Recently, as the public interests about the 3D printing technology are increased, various kinds of 3D printers are being released. But, they are limited to use because they cannot fabricate an object which is larger than the printer's printing volume. To relieve this problem, we propose an interactive 3D mesh editing system for 3D printing the object that is larger than the printing volume. The proposed 3D editing system divides the input 3D mesh using the user's line drawings defining cutting planes and it attaches various connectors. The output meshes are guaranteed to fabricate without post-processing. The printed parts can be assembled using the connectors. Our proposed system has an advantage that it can be used easily by non-professional 3D printer users.

• EDISON SW 활용 경진대회 논문집
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• 제6회(2017년)
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• pp.566-573
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• 2017

Develop a leg walking robot with 'Janssen mechanism'. Using 'ScienceBox' base and add more items to improve moving speed and balance of the robot. To make the robot better, made optimized drawing and produced it using plastic with 3D printer and acyrl with Laser cutting machine.