• 한국CDE학회논문집
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• 제22권2호
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• pp.215-221
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• 2017

This paper describes a method of precise estimation for printing time and material consumption which are directly related to the 3D printing cost. Printing process and head motion of 3D printers using digital printing head, which is analyzed by its digitized steps, is rapidly simulated without slicing to calculate estimated printing results. Using this method, printing time and material usage of 3D printer were estimated quickly and precisely and compared to the real printing result. Applying compensation using the printing parameters, transferred from the 3D printer to the printing estimation system, even more accurate estimation is achieved. This method is used in the 3D Sprint software.

• Journal of Computing Science and Engineering
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• 제11권4호
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• pp.152-159
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• 2017

Three-dimensional (3D) printing is applied to many areas of life, but 3D printing models are stolen by pirates and distributed without any permission from the original providers. Moreover, some special models and anti-weapon models in 3D printing must be secured from the unauthorized user. Therefore, 3D printing models must be encrypted before being stored and transmitted to ensure access and to prevent illegal copying. This paper presents a selective encryption algorithm for 3D printing models based on clustering and the frequency domain of discrete cosine transform. All facets are extracted from 3D printing model, divided into groups by the clustering algorithm, and all vertices of facets in each group are transformed to the frequency domain of a discrete cosine transform. The proposed algorithm is based on encrypting the selected coefficients in the frequency domain of discrete cosine transform to generate the encrypted 3D printing model. Experimental results verified that the proposed algorithm is very effective for 3D printing models. The entire 3D printing model is altered after the encryption process. The decrypting error is approximated to be zero. The proposed algorithm provides a better method and more security than previous methods.

• Journal of International Society for Simulation Surgery
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• 제3권2호
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• pp.49-59
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• 2016

3D printing is also known as additive manufacturing technique in which has been used in various commercial fields such as engineering, art, education, and medicine. The applications such as fabrication of tissues and organs, implants, drug delivery, creation surgical models using 3D printer in medical field are expanding. Recently, 3D printing has been developing for produce biomimetic 3D structure using biomaterials containing living cells and that is commonly called "3D bio-printing". The 3D bio-printing technologies are usually classified four upon printing methods: Laser-assisted printing, Inkjet, extrusion, and stereolithograpy. In the bio-printing, bio-inks (combined hydrogels and living cells) are as important components as bio-printing technologies. The presence of various types of bioinks, however, in this review, we focused on the bio-inks which enables bioprinting efficacy using hydrogels with living cells.

• 한국의상디자인학회지
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• 제18권3호
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• pp.245-260
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• 2016

This study explored cases of 3D printing utilization in domestic and overseas fashion industries, and presented utilization strategies for fashion design departments in universities in future by grasping characteristics of newly appearing distribution types through 3D printing. Cases of producing costumes using 3D printing in fashion industry comprised a bikini using the material of Nylon12 that continuum fashion demonstrated, innovative 3D costumes by Iris Van Herpen, Tweed Suit using the material that Chanel manufactured with 3D printing technology, but they were limited to experimental fashion works due to limitations of 3D printer material and printing size. On the other hand, in fashion accessories, with jewelry and shoes at the head of the list, MCM and Kipling also demonstrated bags using this technology, and Elvis Pompilio and Gabriela Ligenza demonstrated 3D printing hat products as well. Except the above, as in glasses and neckties utilizing 3D printing, owing to reduced limitations of time, size and material, 3D printing was found to be utilized in fashion accessories other than costumes. Recently there has been a new consumption and distribution structure coming up focusing on 3D printing technology. That is, in overseas countries, content platforms sharing products modeled by oneself has rapidly appeared, and in our country as well, funnypoly, a 3D content platform appeared in 2015. The appearance of these new types of distribution structures means that the common people can produce design contents, and we believe that it may bring about a change in the traditional way of distribution structure. To walk in step with this change, it is believed that it is necessary for fashion design departments to raise college faculty members who can educate 3D printing, develop curriculum to educate 3D printing, and develop experiential programs connected with middle and high schools.

• 패션비즈니스
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• 제24권4호
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• pp.130-143
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• 2020

The development of three-dimensional (3D) printing technology is bringing new innovations to various fields such as health care, architecture, and fashion. 3D printing can be manufactured to suit the size of the consumer's body, modify the design to meet their tastes, and produce small quantities of various products. Therefore, 3D printing in the field of fashion has great potential. The purpose of this study was to investigate various application models of 3D printing for fashion design and analyze their characteristics after developing the fashion garment samples. First, the background of 3D printing was reviewed then, fashion designed by a 3D printing application was analyzed. As a result, four types of 3D printing applications were developed: object-attached, linkage, kinematics, and assembly. The object-attached type was the method of printing 3D material as an object in the intended shape and form and was attached to the garment by sewing. The linkage type referred to printing 3D material in small pieces of certain shapes that could be linked. The kinematics type was structures with hinges that could flex to fit the human body. The assembly type referred to developing 3D materials in female and male pieces such as nuts and bolts. By providing the advantages, disadvantages, trial-and-errors, and challenges of the 3D printing fashion design process, this study contributes to the effective applications and possibilities of future design.

• 패션비즈니스
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• 제23권6호
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• pp.101-115
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• 2019

3D printing is attracting attention from all industries as it enables the development of personalized product design to meet consumer needs by establishing a mutual connection system between production, management and consumers. However, there are still limitations to applying them as apparel materials, and research on the recognition of 3D printing or the preference for fashion products is needed to actually commercialize 3D printing in the fashion industry. In this study on the development of various product designs using 3D printing technology in the fashion industry, an analysis of 255 questionnaires was conducted to determine the preferences and purchase intention trends of fashion product design using 3D printing for college students. Data analysis was performed with IBM SPSS Statistics (V.24). 'Fashion sensitive pursuit', 'Individuality & brand pursuit' and 'Functional convenience' was interested in fashion accessories using 3D printing technology and customized fashion apparel products using 3D printing. 'Functional Convenience-oriented' and 'Practical Purchasing-oriented' type showed that the functionality and durability of products made using 3D printing technology were important. And 'Individuality pursuit' type indicated that design and applied materials were important when producing products using 3D printing technology.

• 한국산학기술학회논문지
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• 제17권10호
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• pp.34-38
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• 2016

본 연구는 3D프린팅 산업에서 3D프린팅 운용과 개발에 사용되어지는 전문기술인력을 효과적으로 양성할 수 있는 3D프린팅전문운용사와 3D프린터개발산업기사의 국가기술 자격종목을 개발하고자 하는데 그 목적이 있다. 연구의 목적을 달성하기 위하여 3D프린팅 분야의 국내외 실태 조사, 문헌조사를 통하여 3D프린팅 관련 교육훈련기관 및 검정 수요 예상인력을 파악했으며, 유사자격제도를 분석하였고, 직무분석을 통하여 3D프린팅전문운용사와 3D프린터개발산업기사의 직무 및 교육내용을 분석하였다. 3D프린팅전문운용사의 필기시험은 3D 스캐너, 3D 모델링, 3D프린터 설정, 3D프린터 출력 및 후가공, 3D프린터 교정 및 유지보수 5개 과목과 실기시험의 경우, 3D프린터 작품제작, 3D 모델링, 3D 스캐너, 3D프린터 유지보수 실무 등을 내용으로 검정 방법으로는 작업형이다. 3D프린터개발산업기사의 필기시험은 3D프린터 회로 및 기구, 3D프린터 장치, 3D프린터 프로그램, 3D프린터 교정 및 유지보수 등 4개 과목과 실기시험의 경우, 3D프린터 조립 및 출력점검, CAD 작업, 3D프린터 프로그램, 3D프린터 유지보수 실무 등을 내용으로 검정방법으로는 작업형이다. 또한, 3D프린팅전문운용사와 3D프린터개발산업기사 자격종목 신설에 대한 설문조사를 실시했으며, 3D프린팅전문운용사와 3D프린터개발산업기사 자격종목의 출제기준 및 채점 방법을 제시했고, 필기시험과 실기시험에 대한 모의 검정시험도 실시하였다. 이러한 결과를 토대로 3D프린팅전문운용사와 3D프린터개발산업기사에 대한 교육프로그램을 만들었으며, 자격검정을 실시할 수 있는 출제기준을 제시하였다.

• 한국멀티미디어학회논문지
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• 제20권12호
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• pp.1951-1959
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• 2017

Due to the fact that 3D printing is applied to many areas of life, 3D printing models are often used illegally without any permission from the original providers. This paper presents a novel watermarking algorithm for the copyright protection and ownership identification for 3D printing based on the radius curvature of 3D triangle. 3D triangles are extracted and classified into groups based on radius curvature by the clustering algorithm, and then the mean radius curvature of each group will be computed for watermark embedding. The watermark data is embedded to the groups of 3D triangle by changing the mean radius curvature of each group. In each group, we select a 3D triangle which has the nearest radius curvature with the changed mean radius curvature. Finally, we change the vertices of the selected facet according to the changed radius curvature has been embedded watermark. In experiments, the distance error between the original 3D printing model and the watermarked 3D printing model is approximate zero, and the Bit Error Rate is also very low. From experimental results, we verify that the proposed algorithm is invisible and robustness with geometric attacks rotation, scaling and translation.

• 전기학회논문지
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• 제65권5호
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• pp.825-830
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• 2016

The purpose of this study optimizes the conditions of PLA printing material for 3D printer. Deltabot type 3D printer is used. The ranges of printing temperature, printing speed, and infill density are $195{\sim}215^{\circ}C$, 10~70mm/sec, and 10~100% respectively. From the results of printing temperature, printing quality is almost same every printing temperature. From the results of printing speed and infill density, printing quality is excellent under 40mm/sec, and over 50% respectively. Surface roughness is $2.28{\mu}mRa$ at $205^{\circ}C$, 10mm/sec, 100%, and is $5.93{\mu}mRa$ at $205^{\circ}C$, 70mm/sec. Surface roughness is directly proportional to the printing speed, and is inversely proportional to the infill density. Objects fabricated PLA printing material adhere bed at room temperature.

• 청정기술
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• 제26권2호
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• pp.109-115
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• 2020

최근 3년간 세계 식품 3D프린팅 시장은 연 평균 31.5%의 높은 성장률과 약 94억 6000만 달러에 이르는 산업규모를 보이고 있다. 식품 3D 프린팅 기술은 기존 식품을 자유롭게 디자인함으로써 개인의 취향과 목적에 따라 식품을 제작할 수 있어 다양한 범위로 활용이 가능하다는 장점을 지니고 있다. 세계 여러 국가에서는 식품 3D프린터를 제작하여 식품 3D 프린팅의 장점들을 활용한 음식과 같은 시제품들을 내놓고 있으며 전투식량, 우주식량, 음식점, 유동식, 노인식, 환자식, 유아식 등의 여러 분야에서까지 활용하고자 시도 중에 있다. 성장가능성이 높고 산업 규모가 지속적으로 확대될 전망인 3D 프린팅 시장은 블루오션이 될 가능성이 다분한 반면 우리나라는 식품 3D 프린팅 기술뿐만 아니라 전반적인 3D프린팅 활용률이나 산업 규모 자체가 작다. 이는 선진국에 비해 미흡한 제도화와 표준화된 국산 소재 개발이 지연 등의 문제가 존재하기 때문으로 따라서 본고에서는 식품 3D프린팅의 필요성에 대해 알리고 우리나라의 식품 3D 프린팅 시장 활성화라는 부가 효과를 얻고자 식품 3D프린팅 기술과 식품소재에 관해 기술하고자 한다.