• Title, Summary, Keyword: Decal

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A study for four colour silkscreen printing (4칼라 실크스크린에 대한 연구)

  • 모인순
    • Archives of design research
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    • v.14 no.4
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    • pp.157-165
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    • 2001
  • The method to make ceramic pigments for 4 colour instead of ink in the process of the of set-printing and put them on the decal paper in the ceramic industry has been used to produce complicated images such as photographs or famous masterpieces. Offset-printing which is the production method for mass production, had enough worth to suffer the past high price of the production line. But today it is not suitable for the production method of small quantity and many kinds corresponding to needs for the various tastes and designs of consumers. Therefore I will put 4 colour printing method on the silkscreen, handiwork, suitable for the production method for small quantities and many variations to develop the methods that permit to cost effectively reproduce complex, high resolution, multicolor images. The study is expected to give value to ceramists who do various works and to be offered as the foundation in the field of design and expression.

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High Temperature Water Electrolysis of Covalently Cross-linked CL-SPEEK/Cs-TSiA/Ceria Composite Membrane (공유가교 CL-SPEEK/Cs-TSiA/Ceria 복합막의 고온 수전해 성능)

  • JUNG, HYEYOUNG;YOON, DAEJIN;CHUNG, JANGHOON;MOON, SANGBONG
    • Transactions of the Korean hydrogen and new energy society
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    • v.28 no.5
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    • pp.433-439
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    • 2017
  • The high temperature performance of PEM type electrolyser at $120^{\circ}C$ based on covalently cross-linked sulfonated poly ether ether ketone (SPEEK) composie membrane was investigated. Ion conductivity and other properties of SPEEK membrane were improved by adding heteropoly acid and Ceria. The membrane electrode assemblies were prepared using commercial PtC and nano-sized $IrRuO_2$ catalyst by electro-spraying and decal process. Voltage efficiency of MEA equipped with SPEEK membrane was slightly better than that of $Nafion^{(R)}$ membrane, due to its higher proton conductivity at high temperature. The cell performance of MEA with CL-SPEEK/Cs-TSiA/Ceria is 1.71 V at $1A/cm^2$ and $120^{\circ}C$.

Evaluation of the Performance of Water Electrolysis Cells and Stacks for High-Altitude Long Endurance Unmanned Aerial Vehicle (고고도 무인기용 수전해 셀 및 스택의 제작 및 성능 평가)

  • JUNG, HYE YOUNG;LEE, JUNYOUNG;YOON, DAEJIN;HAN, CHANGHYUN;SONG, MINAH;LIM, SUHYUN;MOON, SANGBONG
    • Transactions of the Korean hydrogen and new energy society
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    • v.27 no.4
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    • pp.341-348
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    • 2016
  • The experiments related on structure and water electrolysis performance of HALE UAV stack were conducted in this study. Anode catalyst $IrRuO_2$ was prepared by Adam's fusion methods as 2~3 nm nano sized particles, and the cathode catalyst was used as commercial product of Premetek. The MEA (membrane electrode assembly) was manufactured by decal methods, anode and anode catalytic layers were prepared by electro-spray. HALE stack was composed of 5 multi-cells as $0.2Nm^3/hr$ hydrogen production rate with hydrogen pressure as 10 bar. The water electrolysis performance was investigated at atmospheric pressure and temperature of $55^{\circ}C$. Best performance of HALE UAV stack was recorded as cell voltage efficiency as 86%.

Electrochemical Characteristics of Solid Polymer Electrode Fabricated with Low IrO2 Loading for Water Electrolysis

  • Ban, Hee-Jung;Kim, Min Young;Kim, Dahye;Lim, Jinsub;Kim, Tae Won;Jeong, Chaehwan;Kim, Yoong-Ahm;Kim, Ho-Sung
    • Journal of Electrochemical Science and Technology
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    • v.10 no.1
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    • pp.22-28
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    • 2019
  • To maximize the oxygen evolution reaction (OER) in the electrolysis of water, nano-grade $IrO_2$ powder with a low specific surface was prepared as a catalyst for a solid polymer electrolyte (SPE) system, and a membrane electrode assembly (MEA) was prepared with a catalyst loading as low as $2mg\;cm^{-2}$ or less. The $IrO_2$ catalyst was composed of heterogeneous particles with particle sizes ranging from 20 to 70 nm, having a specific surface area of $3.8m^2g^{-1}$. The anode catalyst layer of about $5{\mu}m$ thickness was coated on the membrane (Nafion 117) for the MEA by the decal method. Scanning electron microscopy (SEM) and electrochemical impedance spectroscopy (EIS) confirmed strong adhesion at the interface between the membrane and the catalyst electrode. Although the loading of the $IrO_2$ catalyst was as low as $1.1-1.7mg\;cm^{-2}$, the SPE cell delivered a voltage of 1.88-1.93 V at a current density of $1A\;cm^{-2}$ and operating temperature of $80^{\circ}C$. That is, it was observed that the over-potential of the cell for the oxygen evolution reaction (OER) decreased with increasing $IrO_2$ catalyst loading. The electrochemical stability of the MEA was investigated in the electrolysis of water at a current density of $1A\;cm^{-2}$ for a short time. A voltage of ~2.0 V was maintained without any remarkable deterioration of the MEA characteristics.

Continuous Coating Process Development for PEFC Membrane Electrode Assembly (고분자 연료전지용 MEA 연속 코팅공정 개발)

  • Park, Seok-Hee;Yoon, Young-Gi;Kim, Chang-Soo;Lee, Won-Yong
    • 한국신재생에너지학회:학술대회논문집
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    • pp.110-112
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    • 2006
  • Membrane electrode assembly (MEA) for polymer electrolyte fuel cell (PEFC) are commonly prepared in the research laboratory by spraying, screen-printing and brushing catalyst slurry onto membrane or other support material like carbon paper or polyimide film in a batch style. These hand applications of the catalyst slurry are painstaking process with respect to precision of catalyst loading and reproducibility. It has been generally mentioned that the adoption of continuous process is very helpful to develop the reliable product. In the present work, we report the results of using continuous type coater with doctor-blade to coat catalyst slurry for preparing the MEA catalyst layers In a faster and highly reproducible fashion. We show that while expectedly faster than batch style, the machine coater requires the use of slurry of appropriate composition and a properly selected transfer decal material in order to achieve superior MEA plat lnw loading reproducibility. To make highly viscous catalyst slurry that is imperative for using coater, we use 40wt.% Nafion solution and minimize the content of organic solvent. And the choice of proper high surface area catalyst is important in the viewpoint of making well-dispersed slurry. After catalyst coating onto the support material, we transferred the catalyst layer to both sides of Nafion membrane by hot-pressing In this case, the degree of transfer was Influenced by hot-pressing condition including temperature, pressure, and time. To compare the transferring ability, we compared so many films and detaching papers. And among the support, polyethylene terephthalate(PET) film shows the prominent result.

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A Study on Craft Design Using Storytelling -Focusing on the story of the Byeoljubujeon- (스토리텔링을 활용한 공예디자인에 관한 연구 -별주부전 이야기를 중심으로-)

  • Choi, Jung-Hwa
    • Journal of Digital Convergence
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    • v.15 no.8
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    • pp.359-366
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    • 2017
  • As the quality of life increases and the aesthetic value of the product is emphasized, it tend to consider the sensitivity of consumers in designing goods. The importance of storytelling is becoming more prominent as the purchasing factor of products shifted from the center of the product to emotional of products. In this paper, the purpose of developing emotional marketing craft design using storytelling is to understand the storytelling concept and analyze the case of craft design using storytelling. Craft is an easy-to-value or aesthetic value of the goods in the fields of design, diversity and originality can be pursued and has unlimited potential. Now, in addition to the semantic value of expressive values with a consumer sensibility needs requires the development of this research craft crafts design industry has established itself as a high value-added industry could do more to take advantage of the Foundation.

A Study on Convergence Expression Using Transfer Printing Techniques in Contemporary Ceramic Art (현대 도예의 전사기법을 활용한 융복합 표현에 관한 연구)

  • Park, Koung-Ju;Choi, Jung-Hwa
    • Journal of Digital Convergence
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    • v.15 no.5
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    • pp.333-338
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    • 2017
  • Modern ceramics art has various expression techniques. Among them, the digitization of modern society has led to the development of the transfer printing technique, and the technique of transfer printing has been utilized as medium of expression of modern ceramics. However, the transfer printing technique is merely uniform and does not give enough information to utilize the artistic expression of the craftsmen using the technique of decal rather than actively utilizing it in the field for mass production. Therefore. In this paper, we will examine the works of contemporary pottery artists who understand the meaning of the transfer printing technique and express the artist 's personality and artistry with transfer printing technique, so that the transfer printing technique can enhance the aesthetic and artistic effect of ceramic art as the expression medium of modern ceramics. We want to lay the foundations for a higher value-added industry.

Performance of Membrane Electrode Assembly for DMFC Prepared by Bar-Coating Method (Bar-Coating 방법으로 제조한 직접메탄올 연료전지 MEA의 성능)

  • Kang, Se-Goo;Park, Young-Chul;Kim, Sang-Kyung;Lim, Seong-Yop;Jung, Doo-Hwan;Jang, Jae-Hyuk;Peck, Dong-Hyun
    • Journal of the Korean Electrochemical Society
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    • v.11 no.1
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    • pp.16-21
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    • 2008
  • The key component of a direct methanol fuel cell (DMFC) is the membrane electrode assembly (MEA), which comprises a polymer electrolyte membrane and catalyst layers (anode and cathode electrode). Generally the catalyst layer is coated on the porous electrode supporter (e.g. carbon paper or cloth) using various coating methods such as brushing, decal transfer, spray coating and screen printing methods. However, these methods were disadvantageous in terms of the uniformity of catalyst layer thickness, catalyst loss, and coating time. In this work, we used bar-coating method which can prepare the catalyst layer with uniform thickness for MEA of DMFC. The surface and cross-section morphologies of the catalyst layers were observed by SEM. The performances and resistance of the MEAs were investigated through a single cell evaluation and impedance analyzer.

Rapid Topological Patterning of Poly(dimethylsiloxane) Microstructure (Poly(dimethylsiloxane) 미세 구조물의 신속한 기하학적 패터닝)

  • Kim, Bo-Yeol;Song, Hwan-Moon;Son, Young-A;Lee, Chang-Soo
    • Textile Coloration and Finishing
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    • v.20 no.1
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    • pp.8-15
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    • 2008
  • We presented the modified decal-transfer lithography (DTL) and light stamping lithography (LSL) as new powerful methods to generate patterns of poly(dimethylsiloxane) (PDMS) on the substrate. The microstructures of PDMS fabricated by covalent binding between PDMS and substrate had played as barrier to locally control wettability. The transfer mechanism of PDMS is cohesive mechanical failure (CMF) in DTL method. In the LSL method, the features of patterned PDMS are physically torn and transferred onto a substrate via UV-induced surface reaction that results in bonding between PDMS and substrate. Additionally we have exploited to generate the patterning of rhodamine B and quantum dots (QDs), which was accomplished by hydrophobic interaction between dyes and PDMS micropatterns. The topological analysis of micropatterning of PDMS were performed by atomic force microscopy (AFM), and the patterning of rhodamine B and quantum dots was clearly shown by optical and fluorescence microscope. Furthermore, it could be applied to surface guided flow patterns in microfluidic device because of control of surface wettability. The advantages of these methods are simple process, rapid transfer of PDMS, modulation of surface wettability, and control of various pattern size and shape. It may be applied to the fabrication of chemical sensor, display units, and microfluidic devices.

A study on Check Pattern of Nail Art (네일 아트에 나타난 체크 패턴에 관한 연구)

  • Jeong, Seung-Eun;Kim, Jeong-Mee
    • Journal of the Korea Fashion and Costume Design Association
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    • v.17 no.1
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    • pp.53-68
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    • 2015
  • The purpose of this study is to analyze check pattern of nail art from 2011 to 2013. The results of this study are as follows; 1) Check pattern of nail art is total 257 patterns, and there are 84 argyle, 29 tartan, 24 harlequin, 24 over, 23 window-pane, 15 stitcheds, 13 hound tooth, 10 block, 10 madras, 8 gingham, 8 gradation, 7 shepherd, and 2 tattersall check patterns. Through this result, in nail art, the relatively simple patterns such as a vertical pattern, a horizontal pattern, and cross or overlap diagonal line are used more than elaborate and complex check patterns of a fibrous tissue from a weaving process. 2) In check pattern of nail art, N-affiliated color and R-affiliated color are remarkably well-used, because of the effects of argyle, tartan, window-pane, harlequin, stitched, over, and hound tooth check patterns used the most during the past three years. Especially, most tartan, harlequin, over, and hound tooth check patterns use their own special colors such as R-affiliated colors and N-affiliated colors as it is, and argyle, window-pane, stitched, and over check patterns use well by arranging N-affiliated colors and R-affiliated colors. 3) The most used expressive technique is hand painting to express check pattern in nail art, because new products related to UV gel are well launched. These materials can draw fine line that is hard to express by existing polish easily and simply, and not only have set quickly hard, so procedure time is very short, so it is compatible to draw check pattern personally, but also it is well covered, so check pattern is more clearly expressed.

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