• Annual Conference of KIPS
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• 2016.10a
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• pp.68-70
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• 2016

3D 프린터는 연속적인 계층에 특수한 재료를 출력시켜 3차원 물체를 만들어 내는 장치이다. 3D 프린팅을 위해서는 3D 모델을 생성한 후, 이를 3D 프린터에 출력할 수 있도록 G-code로 변환해야 한다. 본 논문에서는 이 변환 작업을 완전 분산 방식으로 처리할 수 있는 알고리즘을 제안한다. 이를 위해 하나의 메인 노드와 N개의 작업 노드로 구성한 시스템에서 2단계에 걸쳐 분할 정복(divide-and-conquer) 방식으로 변환하도록 하였다. 실제 구현한 시스템을 이용하여, 성능에 미치는 요소(모델의 크기 및 정밀도)에 따른 변환 시간의 단축 효과를 보였다.

• The Journal of the Korea institute of electronic communication sciences
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• v.19 no.5
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• pp.967-974
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• 2024

This paper propose a method for detecting defects in 3D printer outputs using a transmissive photo sensor. The transmissive photo sensor measures the transmittance of the material and is used to detect defects that may occur during the printing process. To this end, the transmissive photo sensor is integrated into the 3D printer platform, and an algorithm that processes the data obtained from the sensor in real time to judge the presence of defects was developed. The results of the experiment confirmed that the propoesd system can quickly detect a variety of defects that occur during the manufacturing process. Not only can these results play a crucial role in quality control and productivity enhancement of 3D printers, but they also have potential for application in the manufacturing industry. In the future, it is expected that the defect detection system based on the proposed method will improve the stability and efficiency fo the manufacturing process.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2016.10a
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• pp.735-737
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• 2016

In this paper, we conducted a test of the 3D printer injection method and LSU (Laser Scanning Unit) feature a fusion of the polygon mirror scanning system that is the core mechanism operation for 3D printers for office laser printers SLA system. These tests ensure that the laser was operating and control well was confirmed that a certain point is output to the X-axis by means of a laser module and a polygon mirror. And confirmed after the F-theta lens is incident on the fixed laser power of the beam, and correction according to the correction beam on the mirror reflection was confirmed jineunji the focus according to the Z-axis upper plate.

• TTA Journal
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• s.149
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• pp.20-21
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• 2013

최근 3D 프린팅 기술이 부상하고 있다. 영화에 등장하는 로봇에서부터 산업기기, 심지어 인공 장기까지 3D 프린터로 찍어낼 수 있는 세상이다. 세계경제포럼(World Economic Forum)에서는 3D 프린팅을 올해의 10대 유망기술 중 하나로 선정했고, 미국의 버락 오바마 대통령은 올해 초 국정연설에서 3D 프린팅 기술을 가리켜 '제3의 산업혁명'이라 언급해 이슈가 됐다. 3D 프린팅 기술이 무엇이기에 어떻게 주목을 받는 것일까? 과연 제3차 산업혁명으로 일컬어질 만큼의 잠재력을 가진 기술일까?

• Annual Conference of KIPS
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• 2017.04a
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• pp.963-965
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• 2017

최근 3D 프린터에 대한 관심이 커지고 있다. 3D 프린팅을 위해서 전용 소프트웨어를 이용하여 설계 파일을 생성하고 출력하지만, 각 3D 프린트마다 지원하는 파일 형식이 다르고, 특정 데이터 파일 형식을 변환할 때에는 별도의 프로그램이 필요하기 때문에 많은 시간과 노력이 필요하다. 본 논문에서는 이러한 일련의 복잡한 과정을 개선하기 위해 입력 파일을 각 3D 프린터가 지원하는 파일 형태로 손쉽게 변환하여 출력할 수 있는 모델링 기법을 제안한다.

• Journal of the Korean Academy of Esthetic Dentistry
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• v.30 no.2
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• pp.59-70
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• 2021

The inflow of digital systems into the dental field has had a great impact on dentists and dental technicians. and it brought improved accuracy, convenience, and work efficiency than before. However, digital doesn't solve everything, and it certainly has limitations. Therefore, it is recommended that clinicians clearly understand the strengths and weaknesses of the traditional method and the digital method and design their own workflow that harmonizes the two methods. In this part, I introduce how I use and apply 3D printers in clinical field.

• The Journal of the Korea institute of electronic communication sciences
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• v.15 no.2
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• pp.313-318
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• 2020

Since the engineering plastics having a melting point of higher than 300 degrees have a high mechanical rigidity, chemical resistance, friction and abrasion performance, those are being highlighted as metal replacement materials in various industries. In this study, 3D printer nozzle with excellent heat dissipation characteristics are designed and analytically verified to form engineering plastics with high melting points in 3D printers based on the melt-lamination modeling method. In order to insulate between the heat block heated to a melting point of filament material and the upper part of the nozzle where the filament is transferred, the heat brake part with low thermal conductivity was designed to have two separate parts, and a cooling fin structure is further applied to the heat brake part to lower steady-state temperature by air convection. Optimized structural design on FDM nozzle part reduces the temperature at the heat sink and at the end part of heat brake by 50% and 14% respectively, compared to the conventional BCnozzle structure.

• The Journal of Korean Society for Radiation Therapy
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• v.27 no.1
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• pp.61-71
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• 2015

Purpose : 3D Printers are used to create three-dimensional models based on blueprints. Based on this characteristic, it is feasible to develop a bolus that can minimize the air gap between skin and bolus in radiotherapy. This study aims to compare and analyze air gap and target dose at the branded 1 cm bolus with the developed customized bolus using 3D printers. Materials and Methods : RANDO phantom with a protruded tumor was used to procure images using CT simulator. CT DICOM file was transferred into the STL file, equivalent to 3D printers. Using this, customized bolus molding box (maintaining the 1 cm width) was created by processing 3D printers, and paraffin was melted to develop the customized bolus. The air gap of customized bolus and the branded 1 cm bolus was checked, and the differences in air gap was used to compare $D_{max}$, $D_{min}$, $D_{mean}$, $D_{95%}$ and $V_{95%}$ in treatment plan through Eclipse. Results : Customized bolus production period took about 3 days. The total volume of air gap was average $3.9cm^3$ at the customized bolus. And it was average $29.6cm^3$ at the branded 1 cm bolus. The customized bolus developed by the 3D printer was more useful in minimizing the air gap than the branded 1 cm bolus. In the 6 MV photon, at the customized bolus, $D_{max}$, $D_{min}$, $D_{mean}$, $D_{95%}$, $V_{95%}$ of GTV were 102.8%, 88.1%, 99.1%, 95.0%, 94.4% and the $D_{max}$, $D_{min}$, $D_{mean}$, $D_{95%}$, $V_{95%}$ of branded 1cm bolus were 101.4%, 92.0%, 98.2%, 95.2%, 95.7%, respectively. In the proton, at the customized bolus, $D_{max}$, $D_{min}$, $D_{mean}$, $D_{95%}$, $V_{95%}$ of GTV were 104.1%, 84.0%, 101.2%, 95.1%, 99.8% and the $D_{max}$, $D_{min}$, $D_{mean}$, $D_{95%}$, $V_{95%}$ of branded 1cm bolus were 104.8%, 87.9%, 101.5%, 94.9%, 99.9%, respectively. Thus, in treatment plan, there was no significant difference between the customized bolus and 1 cm bolus. However, the normal tissue nearby the GTV showed relatively lower radiation dose. Conclusion : The customized bolus developed by 3D printers was effective in minimizing the air gap, especially when it is used against the treatment area with irregular surface. However, the air gap between branded bolus and skin was not enough to cause a change in target dose. On the other hand, in the chest wall could confirm that dose decrease for small the air gap. Customized bolus production period took about 3 days and the development cost was quite expensive. Therefore, the commercialization of customized bolus developed by 3D printers requires low-cost 3D printer materials, adequate for the use of bolus.

• Cartoon and Animation Studies
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• s.41
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• pp.455-486
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• 2015

The 3D printing technology, which started from the patent registration in 1986, was a technology that did not attract attention other than from some companies, due to the lack of awareness at the time. However, today, as expiring patents are appearing after the passage of 20 years, the price of 3D printers have decreased to the level of allowing purchase by individuals and the technology is attracting attention from industries, in addition to the general public, such as by naturally accepting 3D and to share 3D data, based on the generalization of online information exchange and improvement of computer performance. The production capability of 3D printers, which is based on digital data enabling digital transmission and revision and supplementation or production manufacturing not requiring molding, may provide a groundbreaking change to the process of manufacturing, and may attain the same effect in the character merchandise sector. Using a 3D printer is becoming a necessity in various figure merchandise productions which are in the forefront of the kidult culture that is recently gaining attention, and when predicting the demand by the industrial sites related to such character merchandise and when considering the more inexpensive price due to the expiration of patents and sharing of technology, expanding opportunities and sectors of employment and cultivating manpower that are able to engage in further creative work seems as a must, by introducing education courses cultivating manpower that can utilize 3D printers at the education field. However, there are limits in the information that can be obtained when seeking to introduce 3D printers in school education. Because the press or information media only mentions general information, such as the growth of the industrial size or prosperous future value of 3D printers, the research level of the academic world also remains at the level of organizing contents in an introductory level, such as by analyzing data on industrial size, analyzing the applicable scope in the industry, or introducing the printing technology. Such lack of information gives rise to problems at the education site. There would be no choice but to incur temporal and opportunity expenses, since the technology would only be able to be used after going through trials and errors, by first introducing the technology without examining the actual information, such as through comparing the strengths and weaknesses. In particular, if an expensive equipment introduced does not suit the features of school education, the loss costs would be significant. This research targeted general users without a technology-related basis, instead of specialists. By comparing the strengths and weaknesses and analyzing the problems and matters requiring notice upon use, pursuant to the representative technologies, instead of merely introducing the 3D printer technology as had been done previously, this research sought to explain the types of features that a 3D printer should have, in particular, when required in education relating to the development of figure merchandise as an optional cultural contents at cartoon-related departments, and sought to provide information that can be of practical help when seeking to provide education using 3D printers in the future. In the main body, the technologies were explained by making a classification based on a new perspective, such as the buttress method, types of materials, two-dimensional printing method, and three-dimensional printing method. The reason for selecting such different classification method was to easily allow mutual comparison of the practical problems upon use. In conclusion, the most suitable 3D printer was selected as the printer in the FDM method, which is comparatively cheap and requires low repair and maintenance cost and low materials expenses, although rather insufficient in the quality of outputs, and a recommendation was made, in addition, to select an entity that is supportive in providing technical support.

• The Journal of the Convergence on Culture Technology
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• v.4 no.1
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• pp.27-32
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• 2018

Recently, diverse bio-growth and object production experience learning contents have been developed for AR-based storytelling. In this paper, we will develop a storytelling-based growth type content using 3D printer which can add interest in and motivation of experiential learning. It is possible to increase the value of the characters produced by 3D printer as they can be used as personal collections. The bio-growth type content enables the learners and users to experience the local culture, history, and tourism ecology, which can enhance the educational effect by promoting their understanding in a fun way. The purpose of this study is to develop an application for experiential learning contents which creates a virtual environment in an object smart device where you can experience the culture and ecology of a learning community, and then produce the output using the 3D printer to keep as a personal souvenir. The developed contents application for experiential learning can be utilized not only for students but also for tourists. It is expected to serve as a source for further development of various contents through 3D printing technology.