Earticle

This paper proposes a new algorithm classifing same hues in order toe estimate the spectral reflectance of object from 3 band color image information. To estimate the spectral reflectance of object, the conventional estimation methods are required of 5 or 9 band digital color values. The 5 or 9 band image acquisition systems are required of 5 or 3 times same work for color image acquisition process. To solve the above problems, we propose a new method that can be estimated spectra reflectance estimation of object. The proposed method is to classify same hues corresponding a color stimulus, by using hue angle and chroma vector of a color stimulus. The classified same hues are used as the population corresponding a color stimulus. The range of same hue is estimated by the cumulative proportional ration according to the number of basis function

The UV curing industry is one of the most wide application fields in the coating and printing inks industry. Applications extend to general coating for paper, board, wood tapes, compact discs and holograms, ink, photoresists for imaging processes and adhesives for welding and sealing in circuit boards. The UV-curing resins have advantages of quick set, space saving, clean environment and efficient use of energy. The purpose of this study has been to control of morphology structures consist of UV-curing resins and alkyd resins. Therefore, we are investigated with regard to rheology properties on the exposure to UV-curing, structures and mechanical properties for curing films.

Recently. color proofing in printing industry grow rapidly. If an order decide color from known color information in the case of color reproduction, we can reduce expenses and time. In color proofing the best important point must be closed proofed color to primary color and secondary color. Model-based approaches have the advantages of faster recharacterization and the opportunity of simulating product enhancements such as changes in ink properties and halftoning. In this paper, we transformed the dot area of CMYK to CIELAB color space using color reproduction models. Firstly, we measured spectral reflectance of primary color printed by Matchprint II and the data was used to find tone reproduction curve using regression equation, and than we applied at primary color model, such as Murray-Davies, Yule-Nilsen, and mixed color model, such as Kubelka-Munk, relaxed version of spectral Neugebauer. In such results, the Kubelka-Munk model resulted in the best spectral reconstruction accuracy followed by relaxed version of spectral Neugebauer model, color difference is 2.8401.

가시광을 선택적으로 반사하는 광 응답성 코레스테릭 액정을 조제하고, 그 선택적 반사파장의 광화학적 변조를 시도함으로서 포토닉스(Photonices) 재료로서의 가능성을 검토했다. 고유의 선택 반사파장의 변조는 아조벤젠 유도체의 트란스(trans)·시스(cis)간의 광이성화에 의해 상전이 온도와 칼라의 변화와 함께 가역적으로 제어되어질 수 있었다. 또한 선택 반사파장의 변화에 수반되는 반사율의 변화는 코레스테릭 액정과 검출광의 광학적 성질에 의해 크게 좌우되어 지고, 반사율의 가역적인 스위칭에 있어서는 검출광에 대한 코레스테릭 액정의 초기 반사파장의 위치는 상반된 스위칭 모드(normal and reverse modes)를 산출하기에 매우 중요한 역할을 담당했다.

Photochemical modulation of Bragg-reflection wavelengths based on isomerization of an azobenzene (Azo) and subsequent change in reflectance was investigated in cholesteric liquid crystals (ChLCs) which reflect light in visible wavelength region. Irradiation at 366 nm, which causes an efficient transcis isomerization of Azo, led to change in reflected color of ChLCs toward shorter wavelengths with a concomitant lowering of phase transition. Reversible change in color was induced all-optically by alternate irradiation at effective wavelengths for reversible isomerization of Azo. A considerable variation in reflectance was also observed when the photoinduced change in color was measured by a probe light with the same handedness as the ChLCs. The spectral Position of selective light reflection in the initial states played an important role to produce a normal-mode and a reverse-mode switching in photoinduced modulation of reflectance of the ChLCs with respect to the probe light.

Joint photographic experts group (JPEG) is a standard still-image compression technique, established by the international organization for standardization (ISO) and international telecommunication standardization sector (ITUT). The standard is intended to be utilized in the various kinds of color still imaging systems as a standard color image coding format. Because JPEG is a lossy compression, the decompressed image pixel values are not the same as the value before compression. Various distortions of JPEG compression and JPEG recompression has been reported in various papers. The Image compressed by JPEG is often recompressed by same type compression method in JPEG. In general, JPEG is a lossy compression and the quality of compressed image is predicted that is varied in according to recompression Q-factor. In this paper, four difference color samples(photo image, gradient image, gradient image, vector drawing image, text image) were compressed in according to various Q-factor, and then the compressed images were recompressed according to various Q-factor once again. As the result, this paper evaluate the variation of image quality and file size in JPEG recompression and recommed the optimum recompression factor.

Recently, as the prepress mainstream is changed to the digital workflow, various digital proofing systems such as high price dye sublimation printers and low price ink jet printers are widely used in printing industry. CRT monitors are also often used as a soft proofing device. However, it is very difficult to match the color image displayed on CRT monitors to the actual images printed on papers, because the color space of CRT monitors is RGB color system, and it is different with the CMY color system of the printing devices. Therefore, proper color compensations are needed to match the colors between hard-copy proofs on the printing device and soft copy proofs on CRT monitors. This paper shows the LUT and gamut mapping method considering the printing characteristics of output device is useful for the compensation.

In this experiment butadiene rubber(BR)/acrylonitrile butadiene rubber(NBR) blends was prepared and then the applicability of BR/NBR blends as printing rubber roller was examined. With the aid of open 2-roll mill, BR, NBR and another chemical additives were compounded. Then rubber vulcanizates were manufactured by hot press and maximum torque, Mooney viscosity, mechanical properties and oil resistance of the test specimens were measured. With prolonged oil aged treating time, BR/NBR blends became soft and so the hardness of blends decreased. It could be explained by the swelling of rubber matrix with oil penetration in to rubber molecules. The undesirable low value of oil resistance of BR was significantly improved by blending BR with NBR.

We synthesized hexapyrrolylbenzene(HPB) an octapyrrolylenaphthalene(OPN) and measured photocurrent and darkcurrent of them. At the result, photocurrent of HBP/TiOPc and OPN/TiOPc systems were 1.81E-11 and 1.04E-10 at electric field 4.4×10³V/cm, and efficiency of them were 16 and 167 respectively.

It is well known that the characteristics of liquid crystal polymer composite(LCPC) films are possessed of large-area and flexible display, polarizer free, high contrast, wide angle of visual filed and high responsiveness. In this study, we have investigated to the best optimal mixing rates chiral nematic liquid crystals and UV-curable resins having different properties acrylate moleculars. The purpose of this study has been the development of new functional application with liquid crystal polymer composite films. For example the films were applied a new thermal sensor. In results, best phase separation behaviors turned out liquid crystal/monomer/oilgomer mixture system.

Meso 치환 thiacarbocynin 색소의 회합체 형성시 치환기 효과와 열역학적인 정보를 얻기위한 수단으로 UV/Vis 분광기를 이용하여 색소농도 변화에 따른 회합정수 , 회합자유에너지 , 회합엔탈피 를 구하였다. 그 결과 농도 증가와 함께 Dimer의 생성이 증가하였으며 온도감소와 함께 Dimer형성쪽으로 회합평형상수가 이동하였다. 치환기 효과로는 phenyl기의 치환이 평면 구조를 형성하는데 있어서는 methyl, ethyl기 치환체보다 회합체형성이 유리하였으며 회합자유에너지와 회합엔탈피도 alkyl기 치환체보다 증가하였다.하였다. 회합자유에너지와 회합엔탈피도 alkyl기 치환체보다 증가하였다.다.

To take an information of substitutent effect and thermodynamic of association at thiacarbocyanines, association constant , free energy of association , enthalpies of association were measured by spectrophotometer according to dependence on concentration of dyes and temperature of aqueous MeOH system. With increase of concentration dyes or decrease of temperature of aqueous MeOH system, absorption spectra of dyes exhibited equlilibria shift toward the dimer. Phenyl meso substituted thiacarbicyanine, DyeIII, resulted in higher and values than DyeI and DyeII. To easily make an association of thacarbicyanine, meso substutituent group need to be a flat structure, which will make a park as well as lain tiles.tiles.ructure, which will make a park as well as lain tiles.les.

Enhanced the value of badge good with the gold plating of emblem, sports pictogram, mascot in 2002 Asian Game and World Cup, applying the plating and coating technique to screen printing. In addition, tourist and characteristic goods were of great value and image of visual communication displayed outside. After the screen printing in the surface of stainless steel, it obtained the plate coloring of beautiful a black glossy with a black Ru plating. At the identical surface, it did that the electrodeposition coating process in order to making a conductor state of image areas and a nonconductor state of nonimage areas. After the electrodeposition process, it removed the printing ink of image areas with solvent. A manufacturing process, it removed the printing ink of image areas with solvent. A manufacturing process completed with copper, nickel and gold plating at bared metal surface.

A previous paper was reported in being sensetized photopolymer, poly(vinyl cinnamoyl acetate)(PVCiA) with some squarylium dyes such as 1,3-bis(4 or 6-trifluoromethyl-1,3,3-trimethylindo)squarylium dyes(TFSQ) and 1,3-bis(4 or 6-nitro-1,3,3-trimethylindo)(NISQ). Here, we synthesized new 1,3-bis(1,3,3-trimethylpyridylindo)squarylium dyes(PSQD) to sensetize photopolymer, such as poly(vinyl cinnamoyl acetate). Absorption's coefficient of (PSQDI) was 9.7810 , highest absorption's coefficient among them synthesized by author, and the sensitivity of PVCiA added with PSQD1 (3%) was highly sensitized about 16 times than not added, and higher than NISQ(3%). PSQD1 with substituted 4 and 7 positions by nitrogen is rich in n-＊ transition, resulted in high absorption's coefficient, red shift for another squarylium dyes, and afforded to the highest sensitivity of PVCiA.