• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2006.11a
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• pp.392-393
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• 2006

Direct Printing Process is a suitable fabrication technique to develope pigment components whose dimensions are in nano. The success of this process depends on the sysmatic preparation of pigment millbase. Conventional millbase dispersions are constituted of the organic pigments, monomer, dispersant and solvents. An experimental study on the rheology of millbase dispersions is presented.

• Journal of the Korean Society of Costume
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• v.63 no.2
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• pp.45-54
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• 2013

With the development of digital technology, clothes of unique textiles using the digital printing techniques have appeared as a creative trend in textile design. The development of digital textile printing technology has allowed the fashion industry to utilize it as an expressive method of a surrealist trend in current fashion designs, and so it is necessary to understand and study this phenomenon. The present study is an attempt to understand this modern fashion phenomena from an artistic perspective by looking at textile designs that applied actual images to textiles, so that this trend in fashion design can be better understood. In this context, this study aims to examine characteristics and expressive techniques of d$\acute{e}$paysement, automatisme associated with digital textile printing by using actual images among surrealist expressions, and to investigate creative expressions of textile design freely expressing the visual boundary between reality and surrealism with the development of digital technology. For research methods, we reviewed technical texts and previous studies related to our research topic for theoretical exploration and investigated the Internet data and used them for basic data. In the case study, we came up with the characteristics and meanings by classifying fashion design cases using digital textile printing techniques according to expressive techniques of surrealist d$\acute{e}$paysement, automatisme. Details of this study are as follows: First, it investigates the definition and expressive characteristics of d$\acute{e}$paysement, automatisme of the surrealist expression for its theoretical understanding. Second, it comes up with the characteristics by analyzing the digital textile cases from the perspective of d$\acute{e}$paysement, automatisme. Third, it deduces the expressive methods and characteristics of digital textile printing from a the perspective of surrealist d$\acute{e}$paysement, automatisme based on the resulting characteristics. The conclusions show that d$\acute{e}$paysement, automatisme, which consists of improvisation and coincidence, maximized the mysterious images of derealisation and mysterious primitive images. These things emphasized the characteristics of maximization of images, derealisation, and rationalization of irrationalism.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.22 no.1
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• pp.52-60
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• 2021

The aim of this study was to derive a new trend by analyzing installations using 3D printing that are out of the limits of size and design according to the trends of developing 3D printing technology. This paper classified the types of installations using 3D printing and analyzed them with two trends: the trend of design and the trend of output. The trends of installations using 3D printing derived from this study are as follows. First, as the implementation of design through an algorithm is accomplished, the transformation appears with the atypical design that is prominent in complex expression. Second, Robotics and FDM 3D Printing is fused, which is changing the existing paradigm. Therefore, the production and utilization of installations using 3D printing proceeded at a faster pace through the interaction between the algorithm design method and freeform 3D printing technology. This study was conducted on installations using 3D printing around the world and played a basic role in the research on the production of installations using 3D printing along with domestic 3D printing technology to be developed in the future. Follow-up studies in various aspects, such as materials and combination methods, will be needed.

• Journal of the Korean Orthopaedic Association
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• v.56 no.2
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• pp.103-116
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• 2021

The use of 3-dimensional (3D) printing is becoming more common, and its use is increasing in the orthopedic surgery. Currently, there are four major methods of using 3D printing technology in orthopedic surgery. First, surgical planning simulation using 3D printing model; second, patient-specific surgical instruments; third, production of customized prosthesis using 3D printing technique; fourth, patient-specific prosthesis produced by 3D printing. The areas of orthopedic surgery where 3D printing technology can be used are shoulder joint, spine, hip and pelvis, knee joints, ankle joint, and tumors. Since the diseases and characteristics handled by each area are different, the method of using 3D printing technology is also slightly different in each area. However, using 3D printing technology in all areas can increase the efficiency of surgery, shorten the surgery time, and reduce radiation exposure intraoperatively. 3D printing technology can be of great help in treating patients with particularly complex and difficult orthopedic diseases or fractures. Therefore, the orthopedic surgeon should make the most of the benefits of the 3D printing technology so that patient can be treated effectively.

• The Journal of Korean Academy of Prosthodontics
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• v.56 no.1
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• pp.17-24
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• 2018

Lost wax technique of casting wax patterns has been used principally to make metal frameworks of removable partial dentures. Since the development of digital technology and CAD, metal frameworks can be built through digital surveying and framework designing. Many cases proved that resin patterns made by CAD printing method were well adapted to internal oral structure and final metal frameworks also showed good internal adaptation as well. The metal frameworks of a removable partial denture were made by both lost wax technique and CAD technique and were applied to a patient with severe alveolar bone loss. Using CAD data and fit checker, internal adaptation of both metal frameworks were evaluated by comparing the gap between surveyed crown and its structure. This study is to prove that metal frameworks by both techniques showed adaptation that can be applied in clinical field.

• Progress in Medical Physics
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• v.28 no.1
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• pp.33-38
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• 2017

Creating individualized build-up material for superficial photon beam radiation therapy at irregular surface is complex with rice or commonly used flat shape bolus. In this study, we implemented a workflow using 3D printed patient specific bolus and describe our clinical experience. To provide better fitted build-up to irregular surface, the 3D printing technique was used. The PolyLactic Acid (PLA) which processed with nontoxic plant component was used for 3D printer filament material for clinical usage. The 3D printed bolus was designed using virtual bolus structure delineated on patient CT images. Dose distributions were generated from treatment plan for bolus assigned uniform relative electron density and bolus using relative electron density from CT image and compared to evaluate the inhomogeneity effect of bolus material. Pretreatment QA is performed to verify the relative electron density applied to bolus structure by gamma analysis. As an in-vivo dosimetry, Optically Stimulated Luminescent Dosimeters (OSLD) are used to measure the skin dose. The plan comparison result shows that discrepancies between the virtual bolus plan and printed bolus plan are negligible. (0.3% maximum dose difference and 0.2% mean dose difference). The dose distribution is evaluated with gamma method (2%, 2 mm) at the center of GTV and the passing rate was 99.6%. The OSLD measurement shows 0.3% to 2.1% higher than expected dose at patient treatment lesion. In this study, we treated Mycosis fungoides patient with patient specific bolus using 3D printing technique. The accuracy of treatment plan was verified by pretreatment QA and in-vivo dosimetry. The QA results and 4 month follow up result shows the radiation treatment using 3D printing bolus is feasible to treat irregular patient skin.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.11 no.11
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• pp.2032-2038
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• 2007

Embedded Controller which controls whole system is most important part of embedded system. Nowadays, new technique called SoC is more using than ASIC. But SoC have some problems. Because of long development time and high cost, it is hard to applying SoC to small and medium enterprise. So many companies use IP technique combined with embedded processor. High resolution inkjet marking system is printing system with embedded controller. It is used in various part of industry. But it has many problems such as printing quality, marking errors, system faults and so on. In this paper, we designed and implemented IP that can solve the printing quality problems. We analyzed total-logic-elements and timing by simulation. As a result of simulation, we could verified that output signals satisfied reference timing. Appling IP to high resolution inkjet marking system, we could get good quality printing message.

• 한국정보디스플레이학회:학술대회논문집
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• 2008.10a
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• pp.1532-1534
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• 2008

Aquesous carbon nanotubes (CNTs) solutions were prepared using SDS (sodium dodecyl sulfonate) and NADDBS (sodium dodecylbenzene sulfonate). Our inks are found to have the viscosity of 1-2 cps. In addition, the surface tension of inks inversely decreased with increasing surfactant concentration and then saturated at critical micelle concentration (CMC). The low surface tension at CMC gave rise to lower contact angles on Indium layers, resulting in larger printable feature sizes. In the fabrication of cold cathode, jet-printing is feasible to modify and scale up the cathode structures. These feasibilities could contribute jet-printing method to be more adaptable for making large-area cold cathodes.

• 한국정보디스플레이학회:학술대회논문집
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• 2009.10a
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• pp.874-876
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• 2009

This is a report on fabrication and electrical characteristics of pentacene OTFT that uses conducting PEDOT/PSS as source drain electrodes. We demonstrate enhanced conductivity of PEDOT/PSS film with glycerol and optimize properties for ink jet printing. We also present the application of oxygen plasma technique in order to favor selective spreading for subsequent inkjet printing.

• Proceedings of the Korean Vacuum Society Conference
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• 2013.08a
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• pp.265.2-265.2
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• 2013

We fabricate poly(3,4-ethylenedioxythiopene patterns using liquid-bridge-mediated nanotransfer (LB-nTM) printing via vapor phase polymerization (VPP). LB-nTM printing method can simultaneously enable the synthesis, alignment and patterning of the nanowires from molecular ink solutions. Two- or three-dimensional complex structures of VPP-PEDOT were directly fabricated over a large area using many types of molecular inks. VPP method is a versatile technique that can be used to obtain highly conducting coatings of conjugated polymer on both conducting and non-conducting substrates. The PEDOT patterns has analyzed crystallinity from X-ray diffraction pattern and select-area diffraction patterns. In addition, the PEDOT pattern has high conductivity compared other conducting polymers.