• 한국펄프종이공학회:학술대회논문집
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• 한국펄프종이공학회 2006년도 추계학술발표논문집
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• pp.29-38
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• 2006

• 한국산학기술학회논문지
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• 제22권1호
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• pp.52-60
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• 2021

본 논문은 발전하는 3D프린팅 기술의 추세에 맞추어 크기와 디자인의 한계를 벗어난 대형 조형 설치물 제작으로 3D프린팅을 이용한 사례를 분석함으로써 새로이 나타나는 경향을 도출하는 것에 목적을 두고 있다. 본 논문은 3D프린팅으로 제작한 조형설치물의 유형을 분류하고 2가지 경향으로 분석하였다. 첫째, 디자인 측면의 경향, 둘째, 출력방식 측면의 경향이다. 본 연구를 통해 도출된 3D프린팅 조형설치물이 나아가고 있는 경향은 다음과 같다. 첫째, 알고리즘을 통한 디자인 구현이 이루어지면서 복잡한 표현이 두드러지는 비정형 디자인으로 변혁이 나타나고 있다. 둘째, 로봇 공학과 3D프린팅의 적층 제조기술이 융합되어 기존의 패러다임을 전환하고 있다. 따라서 알고리즘 디자인 구현 방식과 Freeform 3D프린팅 기술의 상호작용으로 3D프린팅 조형설치물의 제작과 활용이 더욱 빠른 속도로 진행됨을 알 수 있었다. 본 연구는 전 세계 3D프린팅 조형설치물을 대상으로 연구를 진행하였으며, 앞으로 발전할 국내 3D프린팅 기술과 함께 3D프린팅 조형설치물 제작 연구의 기초적인 역할을 하였다. 추후 재료 및 결합 방식 등 다양한 측면에서 분석한 후속 연구가 필요함을 밝힌다.

• 펄프종이기술
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• 제32권1호
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• pp.1-9
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• 2000

This study was carried out to improve the opacity of printing paper. Conventional filler loading enhanced the opacity of paper, but subsequently caused reduction of paper strength of paper. We try to seek a new filler loading method so-called beater loading that enhances opacity of paper as well as sustained desire strength. In our experiment, comparing to direct loading method, the beater loading method enhanced 0.8% of opacity and 0.2% of brightness. This also decreased the rates of strength reduction of paper. Therefore, the results obtained in this study indicated that beater loading was a very effective method to improve the opacity of paper while not to decreased so much of paper strength.

• 펄프종이기술
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• 제45권1호
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• pp.1-5
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• 2013

Printing papers published in between 1950's and 1990's were treated with three methods such as distilled water washing, $CaCO_3$ solution washing and methyl cellulose solution coating for improving their conservational properties. Accelerated aging with $80^{\circ}C$ and 80% RH for 14 days was applied to the testing papers. Results showed that distilled water and $CaCO_3$ washing kept increased pH even after accelerated aging, but did not improve folding endurances for 1950's-60's papers. Methyl cellulose treatment did not increased pH of the old papers, but increased folding endurances remarkably for 1950's-60's papers even after accelerated aging. It suggests that methyl cellulose treatment after $CaCO_3$ washing should give improvements both in pH and folding endurance.

• 한국도서관정보학회지
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• 제30권3호
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• pp.323-344
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• 1999

First, having noticed that the paper on which the Mugujongkyong from the Sokgat'ap was Broussonetia Kazinoki Siebold, produced under the Tochim process, it is confirmed that the paper used for printing the Mugujongkyong form the Sokgat'ap was Broussonetia Kazinoki Siebold produced in Shilla, by introducing the common fact that the papers on which : written in 755 A.D.) and in Soochung-sokt'ap Hwaomasa were written were the same paper fabricated by the Tochim process. Therefore it is proved that the printing place of the Mugujongkyong from the Sokgat'ap was also Kyongju region in Shilla. Furthermore it is proved that the year of storing Broussonetia kazinoki Siebold n which tarani of the Mugujongkyong was written was circa 705 A.D., provin12g that Broussonetia Kazinoki Siebold was in production in Shilla in 8th Century. Also by confirming the fact that very thin -- mere 0.019mm thick -- Broussonetia Kazinoki Siebold was in production in Shilla in 8th Century, it is proved that Shilla has ability to produce Broussonetia Kazinoki Siebold for Woodblock printing purpose. Second, concerning the Muju Characters written in the ugujongkyong from the Sokgat'ap, mixed use of the Muju Characters was noticeable in written in 755 A.D. from the Sooch'ungsokt'ap at the Hwaomsa written in the same era and the Tripitaka Koreana in Japan was printed in 690's A.D. because of appearance of the Muju Characters in the Saddhamapun-darika is erroneous.

• 한국정밀공학회지
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• 제27권3호
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• pp.95-103
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• 2010

Roll to Roll (R2R) is one of the most promising production technologies in the printed electronics such as OLEDs, e-paper, backplanes, RFID because this technology can save production cost and increase production speed. Printed electronics includes various processes such as printing, drying, winding, unwinding, and so on. In printed electronics R2R system, air-flotation oven is employed for drying process. Therefore, it is essential to introduce efficient and fast drying process when printing is finished. This paper considers the analysis of drying process in R2R that involves hot air flow. Air-flotation oven consists of non-contact supports and drying of coated web materials such as plastic films and paper. In this paper, experimental results and numerical analysis of pressure-pad air bar are investigated. The aerodynamic characteristics of pressure-pad air bar are numerically calculated using computational fluid dynamics (CFD) approach. Then the measured values of the aerodynamic forces for air bars are compared with those of CFD analysis.

• 대한기계학회논문집B
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• 제39권4호
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• pp.379-384
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• 2015

최근 전기방사를 이용한 프린팅이 미세 패터닝 분야에 응용이 되고 있다. 전기방사를 이용한 패터닝은 연속 프린팅 방식으로 기존의 요구적출형 방식에 비해 패터닝 속도가 빠르다는 장점이 있다. 안정적인 연속 프린팅을 위해서는 고분자의 폴리머를 프린팅하려고 하는 잉크에 혼합하는 것이 필요하다. 본 연구에서는 PEO 를 이러한 첨가 폴리머로 사용하였다. 이러한 폴리머의 첨가에 대한 잉크의 점도 및 Taylor cone 형성에 대해 미치는 영향을 조사하였다. 마지막으로 전기방사 프린팅의 예로서 실버 페이스트 잉크를 유리 기판 위에 패터닝하였다.

• 패션비즈니스
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• 제21권3호
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• pp.14-28
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• 2017

This purpose of this study to analyze effect material properties have on change in QR code recognition rate according to change of materials by comparing recognition rate of color QR code. QR code applied to textile materials has the advantage of being washable and being applicable to lost child prevention goods or clothes or a person with dementia through record of information relating to the material or input of additional information, differently from QR code printed on the conventional paper. An effective method of entering QR code in textile materials is Digital Textile Printing(DTP), that facilitates printing by rapidly applying diverse information, and small quantity production. It is possible to tailor various QR codes according to use. Regarding samples to use, cotton material used in clothing products and Tyvek material recently applied to clothing and related products were selected. Reactive dyes were used for cotton, pigment was used for Tyvek, and QR code was printed with an inkjet printer by direct printing method. Printing methods and surface textures are different between cotton and Tyvek. It was revealed that consequent print results and results of recognition rate were different. Regarding color to be printed, 2015 S/S - 2017 S/S color presented by Pantone was used. Color combination affected recognition rate of color QR code. Understanding color combination, material properties and print characteristics may be helpful in increasing recognition rate of color QR code, and may contribute to usability of color QR code applied to textile materials in the future.

• Journal of Information Technology Applications and Management
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• 제23권2호
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• pp.263-277
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• 2016

Recently, 3D printing technology has been considered as a core applicable technology because it brings many improvements such as the development of medical technology, medical customization, and reducing production cost and shortening treatment period. This research suggests a market prediction framework for medical 3D printing business. As an immature market situation, it is important to control some uncertainty for market prediction such as a customers' conversion rate. So we adopt decision making tree (DMT) model which used to choose an optimal decision making among diverse pathway. Among medical industries this paper just focuses on dentistry business. For predicting a 5 year period trend expected market size, we identified some replaceable denture procedure by 3D printing, collected related data, controlled uncertain variables. The result shows that medical 3D printing business could be a market of 28.2 billion won at 1st year and in the end of fifth year it could become on a scale of 61.1 billion won market.

• 한국정밀공학회지
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• 제32권9호
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• pp.787-792
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• 2015

Recently, 3D printing technology is a hot issue in various industrial fields. According to the user's application, it allows for the free form fabrication method to be utilized in a wide range. The powder based fusion technique is one of the 3D printing methods. When using this method it is possible to apply the various binder jetting techniques such as piezo, thermal bubble jet, dispenser and so on. In this paper, a multi thermal bubble ink jet was integrated for jetting of powder binding material and developing a power fused 3D printing system. For high quality 3D printing parts, it needs an analysis and evaluation of the behavior of the thermal bubble ink jet head. In the experiment, a correlation between jetting binder quantity and layer thickness of powder was investigated, and a 3D part model was fabricated, which was used by measuring the scale factor.