• 한국인쇄학회지
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• 제14권2호
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• pp.37-49
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• 1996

The practical lith developer is a hydroquinone solution of moderate alkalinity and low free-sulfite ion concentration with potassium bromide as the restraining agent. In the study on composition of ilth developer to promote high sensitivity, high contrast and long term preservation or use, a new composition of lith developer, namely PK lith developer, was developed and of was found that PK lith developer was superior to the lith developer which was commercially available in terms of contrast, speed and preservation. This paper also describes studies on the addition of hdydrazine to PK lith developer, which have led to further improvements in the system.

• 한국원자력학회:학술대회논문집
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• 한국원자력학회 1997년도 춘계학술발표회논문집(2)
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• pp.244-249
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• 1997

드럼 속의 폐기물 안에 포함되어있는 방사성 물질의 함량을 비파괴적으로 측정하는 방사성폐기물 핵종분석시스템을 개발하여 고리원자력발전소 제4폐기물 저장고에 설치하였다. 시스템은 그 기능에 따라 상위레벨과 하위레벨로 나누어지는데, 상위레벨인 중앙감시 및 제어시스템 Part에서 전체 시스템을 원활하게 운전되도록 감시 제어를 하고, 하위 레벨에서는 드럼을 운반하는데 사용하는 크레인 운전 Part, 측정위치에 올려진 드럼을 분석하는 핵종분석 Part, 드럼 핵종분석 결과를 회전하면서 드럼 표면에 인쇄하는 Ink-jet Printer Part 로 구분된다. 상위레벨의 제어실내 감시제어 PC는 하위레벨과 RS-232C 멀티포트를 사용하여 통신을 하는데, 드럼의 반입에서 반출까지의 전 과정은 자동화되어 운전된다.

• 한국섬유공학회:학술대회논문집
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• 한국섬유공학회 2003년도 The Korea-Japan Joint Symposium
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• pp.31-32
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• 2003

The fixation of reactive dyes onto cotton fabrics by means of dry heat treatment was examined in terms of water regain in fabrics. Dye liquors were applied to fabrics by ink-jet printer. The fixation strongly depended on water regain. At certain level of water regain the fixation showed stepwise increase. After this point the fixation reached to saturated value. The observed results were interpreted by the aggregation behavior of dyes and reactivity of hydroxyl group of cellulose depending on the amount of the surrounding water molecules. Urea molecules played a role of water at low water regain to increase the fixation.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2004년도 추계학술대회 논문집
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• pp.1390-1393
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• 2004

In the present industry, three-dimensional colored shape has required for realistic prototype in rapid manufacturing. Z-corporation developed 3D printer which can color three-dimensional prototype but this process can't be adopted to other rapid prototype products and spend much time and cost coloring 3D shape. In this study a new coloring process on three-dimensional surface is proposed for realistic prototype. Three-dimensional surface coloring apparatus is composed of HP ink jet head and X-Y plotter. Distance and angle between ink jet nozzle and 3D surface are set as process parameter. Based on the experiment of process parameters, it is shown that distance and angle affected on printed image on 3D surface. Circle and line shape are chosen as standard image shape because the shape has widely used as standard in 2D printing. Consequently, the distorted image on 3D surface is corrected by transformed input image data.

• Macromolecular Research
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• 제16권2호
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• pp.149-154
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• 2008

UV-curable electrolytes inks were prepared by dissolving [2-[(methacryloyloxy)ethyl]dimethyl]propylaminium bromide (MEPAB), 1,5-[bis(2-methacryloxyethyl)dimethyl ammono]penthane dibromide (MDAPD), hexafunctional reactive oligomer (SP1013), trimethylolpropane triacrylate (TMPTA) and a photoinitiator in methanol/2-methoxyethanol. The compositions of the electrolyte inks were MEPAB/MDAPD/SP1013/TMPTA=6/24/17.2/12.8, 15/15/17.2/12.8 and 24/6/17.2/12.8. Humid-membranes were deposited on a gold electrode/alumina electrode using an ink-jet printer equipped with a UV lamp followed by immediate UV curing. The humidity-sensing characteristics including hysteresis, frequency and temperature dependence, response time and water durability were estimated.

• 청정기술
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• 제7권3호
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• pp.169-178
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• 2001

섬유염색은 전 세계적으로 매우 큰 시장이나, 염료를 사용하여 섬유염색을 수행하는 기존 인쇄 공정의 경우 염료의 손실 및 환경오염의 문제점을 갖고 있다. 기존 공정들의 경우 섬유 인쇄 시 전처리 및 후처리 공정이 필요하고 이들 공정에서 폐수가 발생하게 된다. 이런 문제점들의 해결방안으로 전처리 및 후처리 공정이 필요없고 잉크를 효율적으로 사용할 수 있는 잉크제트 프린팅 기법을 섬유염색 기술에 적용하려는 노력이 진행중이다. 섬유인쇄를 위해 잉크제트 프린터를 사용할 경우 안료를 사용하기 때문에 잉크는 액체 상에 고체입자가 분산되어 있는 서스펜션 상태로 존재한다. 분자역학 모사 기법과 유사한 Stokesian 역학 모사 방법을 사용한 전산모사를 통해 외부에서 가해진 압력구배에 의해 노즐 관에 흐르는 분산잉크 중의 입자 분포 및 속도 분포 변화를 살펴보았다. 전산모사결과 입자의 부피분율이 낮을수록, 평균 무차원 서스펜션 속도가 낮을수록, 노즐 관과 입자 크기 사이의 비(H/a)가 클수록 입자들의 분포가 상당히 균일한 것으로 나타났다. 따라서 잉크제트 프린팅 기법을 사용하여 섬유인쇄를 수행하는 경우, 노즐 관에의 유속을 작게 하고 노즐 관과 입자 사이의 크기 비를 크게 해야 균일한 인쇄 성능을 얻을 수 있을 것으로 판단된다.

• 펄프종이기술
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• 제37권2호
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• pp.38-46
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• 2005

Experimental work was carried out in order to produce a novel grade of ink-jet paper that has both high print-out quality and price competitiveness. Usually, silica and PVOH has been used for ink-jet paper to design the coating layer that has a hydrophilic and micro-porous structure. However, poor rheological characteristics and low productivity of the silica-PVOH system make the price of the ink-jet paper high. The main focus of this study was replacing the conventional silica (coating pigment) PVOH (binder) coating system with the new PCC (coating pigment) cationic starch (binder) coating system, and optimizing thecoating technology associated with PPC-cationic starch system. In this study, ink-jet print quality of PCC-coated papers was compared with that of silica-coated paper. Two types of PCC were used: conventional type and colloid type. It turned out that PCC C, a conventional coating pigment, has not given a desirable result: it showed high dot reproduction, but it gave low optical density. In spite of low dot reproduction, the qualities of PCC A were comparable or superior to those of silica in optical density, color reproduction, and the uniformity of printing surface. It was also shown that the problems that are happened when the dosage level of cationic starch was too low were varied with ink-type used in each printer. However, in the case of low binder level, the produced image was widely spread resulting fromtoo low optical density of images, or from the lack of bonding ability to set ink into coating surface.

• 한국의학물리학회지:의학물리
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• 제28권3호
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• pp.100-105
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• 2017

The purpose of the present study was to develop and evaluate patient-customized helmets with a three-dimensional (3D) printer for radiation therapy of malignant scalp tumors. Computed tomography was performed in a case an Alderson RANDO phantom without bolus (Non_Bolus), in a case with a dental wax bolus on the scalp (Wax_Bolus), and in a case with a patient-customized helmet fabricated using a 3D printer (3D Printing_Bolus); treatment plans for each of the 3 cases were compared. When wax bolus was used to fabricate a bolus, a drier was used to apply heat to the bolus to make the helmet. $3-matic^{(R)}$ (Materialise) was used for modeling and polyamide 12 (PA-12) was used as a material, 3D Printing bolus was fabricated using a HP JET Fusion 3D 4200. The average Hounsfield Unit (HU) for the Wax_Bolus was -100, and that of the 3D Printing_Bolus was -10. The average radiation doses to the normal brain with the Non_Bolus, Wax_Bolus, and 3D Printing_Bolus methods were 36.3%, 40.2%, and 36.9%, and the minimum radiation dose were 0.9%, 1.6%, 1.4%, respectively. The organs at risk dose were not significantly difference. However, the 95% radiation doses into the planning target volume (PTV) were 61.85%, 94.53%, and 97.82%, and the minimum doses were 0%, 77.1%, and 82.8%, respectively. The technique used to fabricate patient-customized helmets with a 3D printer for radiation therapy of malignant scalp tumors is highly useful, and is expected to accurately deliver doses by reducing the air gap between the patient and bolus.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2005년도 춘계학술대회 논문집
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• pp.749-752
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• 2005

In the industry, three-dimensional coloring has been needed for realistic prototype from rapid prototyping. Z-corporation developed a 3D printer which provides three-dimensional colored prototype. However, the existing process cannot be adopted to models from other rapid prototyping process. In addition, time and cost for manufacturing colored prototype still remain to be improved. In this study, a new coloring process using ink-jet head is proposed for color printing on three-dimensional prototype surface. Process parameters such as the angle and the distance between ink-jet nozzle and the three-dimensional surface should be investigated from experiments. The correction matrix according to sloped angle to minimize the distortion of 2D image was proposed by analysis of printing error. Therefore, approximated method for angle and discrete length according to the radius of curvature for printing on the curved surface was proposed. By printing image on the doubly curved surface, the method was verified. As a practical example, helmet was chosen for printing images on the curved surface. The character images were applied with approximated method for angle and discrete length and was printed on the helmet surface.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 2005년도 ICCAS
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• pp.2160-2163
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• 2005

Solid freeform fabrication (SFF) technology plays a major role in industry and represents a reasonable percentage of industrial rapid prototyping/tooling/manufacturing (RP/RT/RM) development applications. However, SFF technology still has long way to progress to achieve satisfactory process speed, surface finish and overall quality improvement of its application. Today, three dimensional printing (3DP) technique that is one of SFF technology is receiving many interests, and is applied by various fields. It can fabricate three dimensional objects of solid freeform with high speed and low cost using ink jet printing technology. However, need long curing time after manufacture completion. And it must do post-processing process necessarily to heighten strength of objects because strength of fabricated objects is very weak. Therefore, in this study, we proposed an improved 3DP process that can solve problems of conventional 3DP process. The general 3DP process is method to spout binder simply through printer head on powder, but proposed process is method to cure jetted UV resin by UV lamp after jet UV resin using printhead on powder. The hardening of resin is achieved strongly at early time by UV lamp in proposed method. So, the proposed process can fabricate three dimensional objects with high speed without any post-processing.