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Synthesis and Characteristics of Blue Ceramic Pigments Using Electric Arc Furnace Dust (제강분진을 활용한 고온발색 청색무기안료 합성 및 특성에 관한 연구)

  • Son, Bo-Ram;Kim, Jin-Ho;Han, Kyu-Sung;Cho, Woo-Suk;Hwang, Kwang-Taek
    • Journal of the Korean Ceramic Society
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    • v.51 no.3
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    • pp.184-189
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    • 2014
  • Electric arc furnace dust (EAFD) is a solid waste generated by the steel-scrap recycling process. It mainly consists of zinc oxides (ZnO), alumina ($Al_2O_3$), iron oxides ($Fe_2O_3$), and silica ($SiO_2$). Here we report the preparation and characterization of blue ceramic pigments using EAFD powder as a starting material. $(Zn(EAFD),Co)Al_2O_4$ blue ceramic pigment was prepared by the solid-state reaction method. The color characteristics of the pigment obtained were compared with those of pure $CoAl_2O_4$. The new pigment was characterized using XRD, CIE-$L^*a^*b^*$ color-measurements, SEM, and EDX. The XRD analysis revealed that the $(Zn(EAFD),Co)Al_2O_4$ pigment was composed of mainly the spinel phase of $(Zn,Co)Al_2O_4$. The $Zn(EAFD)_{0.25}Co_{0.75}Al_2O_4$ pigments showed a vivid blue color with a $b^*$ value of -28.64 and a good glaze stability with a transparent glaze.

Development of Restructured Chicken Thigh Jerky Added with Red Pepper Seed Powder (고추씨 분말을 첨가한 닭다리살 재구성 육포 개발)

  • Lee, Jeong-Ah;Kim, Hack-Youn
    • Journal of the Korean Society of Food Science and Nutrition
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    • v.45 no.9
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    • pp.1333-1337
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    • 2016
  • This study aimed to investigate the effects of red pepper seed powder on the physicochemical properties (pH, CIE color value, water holding capacity, dry yield, proximate composition, and shear force) of restructured chicken thigh jerky. The restructured chicken thigh jerky samples were prepared with the following amounts of red pepper seed powder [0% (control), 1%, 2%, and 3%]. Moisture contents of samples containing red pepper seed powder were significantly higher than those of control (P<0.05). The lightness, redness, and yellowness of samples an increased with an increase in red pepper seed powder. Water holding capacity and dry yield of samples increased with increasing concentration of red pepper seed powder. However, shear force of samples showed a downward trend with increasing red pepper seed powder level. The sensory evaluation of samples containing 3% red pepper seed powder were highest. The results indicate that red pepper seed powder could be enhance the physicochemical properties of restructured chicken thigh jerky.

Effects of Dietary Metabolizable Energy and Lysine on CarcassCharacteristics and Meat Quality in Arbor Acres Broilers

  • Tang, M.Y.;Ma, Q.G.;Chen, X.D.;Ji, C.
    • Asian-Australasian Journal of Animal Sciences
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    • v.20 no.12
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    • pp.1865-1873
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    • 2007
  • An experiment was performed to evaluate the effects of dietary metabolizable energy (ME) and lysine on carcass characteristics and meat quality in Arbor Acres (AA) broilers from 1 to 56 days of age. A total of 2,970 1-d-old male broiler chicks were randomly allocated to nine dietary treatments (three ME levels in combination with three lysine levels), and dietary ME and lysine concentrations were formulated by varying corn, soybean meal, tallow, and L-lysine sulfate concentrations. Live body weight (BW), carcass weight (CW), dressing percent, breast muscle weight (BMW), yield of breast muscle, muscle color (CIE L*, a*, and b*), pH values 45 min and 24 h postmortem ($pH_{45}$, and $pH_{24}$), meat shear force value (SFV), and water loss rate (WLR) were evaluated. Results showed that live body weight and dressing percent increased (p<0.05) as dietary energy increased. Higher dietary lysine content improved breast muscle weight. Neither carcass weight nor yield of breast muscle was affected by dietary energy or lysine content. Higher ME increased the b* value (p = 0.067) and $pH_{24}$ value (p<0.05), whereas it decreased SFV (p<0.05) and WLR (p = 0.06). Only water loss rate was influenced (p<0.01) by dietary lysine, which was higher in broilers from the high lysine diet as compared to those from medium or low lysine diets. The $pH_{45}$ value and L* value of breast muscle were not affected by ME or lysine. Significant interaction of dietary ME and lysine was found on a* value of breast muscle. These results indicated that dietary ME and lysine had important effects on breast muscle growth and meat quality, however their effects were different. Different concentrations of dietary ME and lysine might be considered to improve meat quality.

Development of Tteokgalbi Added with Pig Skin Gelatine Powder (돈피 젤라틴 분말을 첨가한 떡갈비 개발)

  • Jeong, Han-Gyul;Kim, Hack-Youn
    • Journal of the Korean Society of Food Science and Nutrition
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    • v.45 no.8
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    • pp.1147-1152
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    • 2016
  • This study evaluated the effect of the addition of pig skin gelatine powder with different levels on the chemical compositions, cooking characteristics, and sensory properties of tteokgalbi. Tteokgalbi was produced from products containing 0% (control), 1%, 2%, 3%, and 4% pig skin gelatine powder. The protein and moisture contents of samples increased with an increase of pig skin gelatin powder levels. In addition, the pH value and CIE $b^*$ values of uncooked and cooked samples increased with increasing amount of pig skin gelatin powder. However, cooking loss, diameter reduction, and thickness reduction of samples decreased with an increase of gelatin powder contents. The hardness, gumminess, and chewiness of samples increased with an increase of gelatin powder contents, and sensory evaluation of tteokgalbi containing 2~3% pig skin gelatin powder was the highest. Therefore, usages of pig skin gelatin powder can improve quality characteristics of tteokgalbi.

Color correction of tile color input device using the Neural Network (신경망을 이용한 칼라 입력장치의 칼라 보정)

  • Eum, Kyoung-Bae;Ahn, Chang-Sun
    • Journal of The Korean Association of Information Education
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    • v.3 no.1
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    • pp.134-142
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    • 1999
  • The demand for recognizing the color as well as the object shape is increasing to use the detailed information, because-the expense of color input/output devices become cheap. The research on the color correction should be researched for the exact color presentation and color reproduction of color input/output systems. In this paper, we researched on the color correction of color scanner. The characterization of color scanner is a two step process of gray-balancing and color transformation. The decoupling of the gray-balancing from the color transformation enables the portability of the scanner characterization. We used the least square methods for the line fitting and the Neural Network for the storage space and computation speed. The output of Neural Network is similar to the target value in three-dimensional tristimulus space. The proposed color correction method can be used for all scanners of a manufacturer's model because of the portability.

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EFFECT OF GOLD ELECTRODEPOSIT OF PD-AG, NI-CR ALLOYS ON THE COLOR OF VENERRED RESIN (Pd-Ag 및 Ni-Cr 합금의 금 전착이 전장 레진의 색채에 미치는 영향)

  • Yang, Hong-So;Park, Yeong-Joon
    • The Journal of Korean Academy of Prosthodontics
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    • v.33 no.4
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    • pp.645-661
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    • 1995
  • As the mechanical property of composite resin improved, composite resin has been widely used esthetic dentistry. In the field of esthetic dentistry, the color of prosthetic material is very important. The purpose of this study was to evaluate the color difference of specimens, by the types of alloys and gold electrodeposit. Experimental groups were as follows : Group Prec : Au-Pt alloy with no gold coating and no resin veneer. Group Semi : Pd-Ag alloy with no gold coating and no resin veneer. Group BAse : Ni-Cr alloy with no gold coating and no resin veneer. Group Gsem : Pd-Ag alloy with no gold coating and no resin veneer. Group Gbas : Ni-Cr alloy with no gold coating and no resin veneer. Group PreR : Resin veneer on the Pd-Ag alloy without gold coating. Group SemR : Resin veneer on the Pd-Ag alloy without gold coating. Group GbsR : Resin veneer on the Ni-Cr alloy with gold coating Group BasR : Resin veneer on the Ni-Cr alloy without gold coating. In this study, colors of metal surfaces and veneered resins were evaluated by the CIE $L^{*}a^{*}b$ system. The results obtained were as follows : 1. different alloy types and gold coating make the $L^{*}a^{*}b$ system. 2. The ${\Delta}E^*$ab value between groups semi and Base was less than 1.5 and there was no $a^*$ and $b^*$ value difference between groups Gsem and Gbas 3. The values of $L^*$ and $a^*$ ain groups GsemR and GbasR were so similar that the ${\Delta}E^*$ab value was as small as 0.58. 4. In resin specimens with gold coated semiprecious or base alloys showed yellower and redder deviation than the resin specimens with precious alloy. 5. The ${\Delta}E^*$ab values between goups PreR-GsemR and groups PreR-GbasR were as small as 2.68 and 2.22 respectively.

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The Characteristics and Change of Colors on Fashion Collections in 1990s

  • Kim, Honey;Kim, Young-In
    • International Journal of Costume and Fashion
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    • v.7 no.2
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    • pp.18-31
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    • 2007
  • The purpose of this study is to examine color characteristics and color changes of the fashion collections through 1990s, and to provide the efficient color information for color planning upon fashion themes. For this research, a total of 30,084 colors were collected from Paris, Milan, London, New York Collections in 1990s. Those colors were first measured by the Pantone Textile Color Specifier and COS Color System and spectrophotometer(color eye 580). These measured color values $L^{\ast}a^{\ast}b^{\ast}$of CIE were converted into H V/C of Munsell System, and 12 tones of PCCS with 5 achromatic colors. The characteristics of collected colors were analyzed in general and by place, season and year. The results of the study are as follows : First, the hues of purple blue, yellow red, red, yellow and the tones of grayish, pale, white, black, dark grayish, dull, light grayish appeared mostly. Yellow was shown quite frequently in spring/summer while purple, purple blue, red and yellow red in fall/winter. White, pale, light, light grayish and light gray were shown more frequently in spring/summer while Black, dark grayish, grayish, dark gray and dark in fall/winter. Second, the characteristics of colors by 4 representative places were similar to the general characteristics of colors in 1990's. Third, There were distributed widely Red, Yellow Red, Yellow in the early 1990s, Green Yellow, Green, Blue Green in the mid of 1990s, and Purple Blue, Purple in the late of 1990s. The distribution range of chromatic colors showed wide in both of the early of 1990s and the mid of 1990s for a while, and achromatic colors of grayish, gray and black appeared mostly in the late of 1900s.

Fabrication of GaN Micro-pyramid Structure Arrays for Phosphor-free white Lighting-emitting Diode

  • Sim, Young-Chul;Ko, Young-Ho;Lim, Seung-Hyuk;Cho, Yong-Hoon
    • Proceedings of the Korean Vacuum Society Conference
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    • 2014.02a
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    • pp.299-299
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    • 2014
  • 기존의 고출력 광원들이 환경문제 등으로 외국에서 규제대상으로 지정되고 있는 가운데고체 상태의 광원인 Light-emitting diode (LED)는 기존의 광원에 비해 에너지 절감효과 크기 때문에 인해 널리 사용되고 있는 추세이다. 대부분의 백색 LED의 경우 청색 LED에 황색 형광체를 사용하는 것이 일반적이다. 그러나 이의 경우 빛의 흡수와 재방출 과정에서 생기는 에너지 변환손실의 문제가 불가피하다. 또한, 두 종류의 색을 섞어서 나타나는 낮은 연색성의 문제가 있고 사용할 수 있는 형광체의 종류와 조합도 일본 등 해외에 출원된 특허권으로 연구개발에 어려움이 있다. 이를 해결하기 위해 본 연구에서는 형광체를 사용하지 않는 단일 백색 LED를 개발을 위하여 극성과 반극성을 조합한 구조를 연구하였다. Photo-lithography를 이용하여 다양한 크기와 구조의 홀 패턴을 얻을 수 있었으며, metal organic chemical vapor deposition을 이용하여 다양한 형태의 피라미드 구조를 성장할 수 있었다. 패턴의 홀 크기와 홀 사이의 간격을 조절하면서 성장을 진행 하였고, 그 결과 pyramid와 truncated pyramid 모양의 GaN 구조를 성장할 수 있었다. [그림 1] Pyramid 구조의 반극성 면과 truncated pyramid 구조의 극성 면사이의 성장속도 차이 때문에 양자우물의 두께가 달라짐을 확인하였다. 이로 인해 양자구속효과가 달라져 다른 파장의 발광을 기대할 수 있었다. 뿐만 아니라 In의 확산거리가 Ga보다 길어서 홀사이 간격을 달리하면 In조성비가 달라지는 효과가 있음을 확인하였고 다양한 홀 사이 간격으로부터 각기 다른 파장의 발광을 얻을 수 있었다. 파장을 조금 더 상세하게 분석하기 위하여 Photoluminescence과 Cathodoluminescence을 사용하였다. 이로써 여러 파장을 발광하는 패턴을 섞어 넓은 영역의 발광 스펙트럼을 만들었다. 특히 패턴을 섞는 방법도 홀과 에피 구조를 섞는 방법, 크기가 다른 홀 패턴을 배열하는 방법등 다양히 하며 가장 좋을 패턴을 연구하였다. 그리하여 최적의 패턴과 구조, 성장조건을 찾아 백색의 CIE 좌표값을 얻을 수 있었다.

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Synthesis of Tialite Ceramic Pigments and Coloring in Glazes (Tialite계 세라믹 안료의 합성 및 유약에서의 발색)

  • Kim, Yeon-Ju;Lee, Byung-Ha
    • Korean Journal of Materials Research
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    • v.21 no.8
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    • pp.450-455
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    • 2011
  • [ $Al_2TiO_5$ ]has a high refractive index and good solubility of the chromophore in the $Al_2TiO_5$ lattice, which allows this structure to be a good candidate for the development of new ceramic pigments. However, pure $Al_2TiO_5$ is well known to decompose on firing at $900{\sim}1100^{\circ}C$. However, this process can be inhibited by the incorporation of certain metal cations into its crystalline lattice. In this study, the synthesis of gray ceramic pigment was performed by doping cobalt on the $Al_2TiO_5$ crystal structure. The $Al_2TiO_5$ was synthesized using $Al_2O_3$ and $TiO_2$, and doped with $Co_3O_4$ as a chromophore material. In order to prevent the thermal decomposition during the cooling procedure, MgO was added to samples by 0.05 mole, 0.1 mole, and 0.15 mole as a stabilizer. The samples were fired at $1500^{\circ}C$ for 2 hours and cooled naturally. The crystal structure, solubility limit, and color of the synthesized pigment were analyzed using XRD, Raman spectroscopy, UV, and UV-vis. $Al_2O_3$ was available for the formation of $CoAl_2O_4$, which should also be considered in order to explain the small amount of this phase detected in the sample with the higher $Co^{2+}$ content (${\geq}$ 0.03 mole). It was found that the solubility limit of $Co^{2+}$ in the $Al_2TiO_5$ crystal was 0.02 mole% through an analysis of Raman spectroscopy. Through the addition of a pigment with 0.02 mole% of $Co^{2+}$ to lime-barium glaze, stabilized gray color pigments with 66.54, -2.35, and 4.68 as CIE-$L^*a^*b^*$ were synthesized.

Efficient Organic White Light-Emitting Device Utilizing SAlq, A Novel Blue Light-Emitting Material

  • Lim, Jong-Tae;Ahn, Young-Joo;Kang, Gi-Wook;Lee, Nam-Heon;Lee, Mun-Jae;Kang, Hee-Young;Lee, Chang-Hee;Ko, Young-Wook;Lee, Jin-Ho
    • 한국정보디스플레이학회:학술대회논문집
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    • 2002.08a
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    • pp.773-776
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    • 2002
  • Efficient organic white light-emitting diodes are fabricated by doping [bis(2-methyl-8-quinolinolato) (tripheny-siloxy)aluminium (III)] (SAlq), a blue-emitting layer, with a red fluorescent dye of 4-dicyanomethylene-2-methyl-6-{2-(2,3,6,7-tetrahydro-1H,5H-benzo[i,j]quinolizin-8-yl)vinyl}-4H-pyran (DCM2). The incomplete energy transfer from blue-emitting SAlq to red-emitting DCM2 enables to obtain a balanced white light-emission. A device with the structure of ITO/TPD (50 nm)/SAlq:DCM2 (30 nm, 0.5 %)/$Alq_3$ (20 nm)/LiF (0.5 nm)/AI shows emission peaks at 456 nm and 482 nm from SAlq and at 570 nm from DCM2. The white light-emitting device shows an external quantum efficiency of about 2.3 %, a luminous efficiency of about 2.4 lm/W, and the CIE chromaticity coordinates of (0.32, 0.37) at 100 cd/m^2. A maximum luminance of about 23,800 cd/m^2. is obtained at 15 V and the current density of 782 mA/cm^2.

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