• 한국정보디스플레이학회:학술대회논문집
• /
• 2005.07b
• /
• pp.1394-1397
• /
• 2005

Hyundai LCD Inc. and LUXELL Technologies Inc. have jointly developed a 1.5" passive matrix full color OLED display ($132{\times}RGB{\times}96$, 111ppi) with characteristics of enhanced contrast ratio using black layer technology. This prototype ECR OLED was fabricated with the structure of ITO/HIL/HTL/RGB EML/HBL/ETL/LiF/Black Layer/Cathode and showed significant improvement of contrast ratio comparing with that of non-filtered OLED as well as compatible with circular polarizer OLED

• 한국정보디스플레이학회:학술대회논문집
• /
• 2003.07a
• /
• pp.901-902
• /
• 2003

Three-color organic light-emitting diodes (OLEDs) of metal-semiconductor-metal (MSM) structure have been favricated by using m-MTDATA [4,4',4"-tris (3-methylphenylphenylamino) triphenylamine] as hole injection layer(HIL). The mMTDATA is shown to be an effective hole injecting material, in that the insertion of mMTDATA greatly reduces the roughness of anode surface and improves the device performance. Red, green and blue OLEDs were fabricated, and their color coordinates in CIE chromaticity were found to be (0.600, 0.389), (0.240, 0.525), and (0.171, 0.171), respectively. The luminous efficiencies of the fabricated OLEDs were 1.4 lm/W at 106 $cd/m^{2}$ for red, 1.4 lm/W at 100 $cd/m^{2}$ for green, and 2.0 lm/W at 104 $cd/m^{2}$ for blue.

• Journal of Institute of Control, Robotics and Systems
• /
• v.16 no.4
• /
• pp.368-373
• /
• 2010

A new indoor mobile robot localization method is presented. Robot recognizes well designed single color landmarks on the ceiling by vision system, as reference to compute its precise position. The proposed likelihood prediction based method enables the robot to estimate its position based only on the orientation of landmark.The use of single color landmarks helps to reduce the complexity of the landmark structure and makes it easily detectable. Edge based optical flow is further used to compensate for some landmark recognition error. This technique is applicable for navigation in an unlimited sized indoor space. Prediction scheme and localization algorithm are proposed, and edge based optical flow and data fusing are presented. Experimental results show that the proposed method provides accurate estimation of the robot position with a localization error within a range of 5 cm and directional error less than 4 degrees.

• Proceedings of the KSR Conference
• /
• 2000.11a
• /
• pp.190-197
• /
• 2000

This study was executed to investigate the components making passenger satisfied or unsatisfied for the domestic train seats, and the patterns of the behavior that passenger taking in the train. These results would help in developing the high-speed train seat that adapts the Korean body structure and emotion. This investigation was done for 436 persons who taking in Saemaeul, Mukungwha, Tongil train during the January 1998. In addition subjective evaluations for texture properties, color, and pattern of the seat covers were investigated for 32 subjects in the lab under the controled condition in order to find to which one Korean prefer. The result shows that it is important to enhance the ride quality, and for coverage passenger prefers the soft texture, blue tone color, and abstract pattern.

• Journal of the Society of Cosmetic Scientists of Korea
• /
• v.25 no.4 s.34
• /
• pp.43-50
• /
• 1999

The planarized $SiO_2$ particles were prepared by two-step reduction method of making much smaller particles, micron-sized ones, to improve spreadability, adherence, and smoothness. Various pigments known as flaky extender usually have terrace layers on their surfaces, but $SiO_2$ particles in this study exhibit a smooth surface structure. These single $SiO_2$ particles were used as core particles to prepare the composite particles coated with ultra fine $TiO_2$ particles by a homogeneous precipitation method. The thickness and the morphology of the deposited $TiO_2$ layers could be modified by adjusting the reactant concentrations, the reaction time and the temperature. The characteristics of $SiO_2/TiO_2$ composite in the field of color cosmetics are to give an UV-cut effect and to enhance the chroma of human skin color, one of optical properties.

• Journal of the Korea Academia-Industrial cooperation Society
• /
• v.8 no.3
• /
• pp.477-482
• /
• 2007

This paper examines and analyzes improvement of structure of bulb, increase of luminous efficiency through application of reflector globe through aluminum coating and development of 60[W] basking neodymium lamp through optimum insertion ratio of krypton gas and nitrogen gas. The results of this development shows that the life of the lamp was 7,200 hours, and the luminous flux was 620[1m]. This brings in superior color temperature and superior color rendering index, which allows us to use that lamp for agricultural or general purpose.

• Textile Coloration and Finishing
• /
• v.16 no.1
• /
• pp.26-33
• /
• 2004

Two reactive disperse dyes having $\alpha$-bromoacrylamide or acrylamide group were synthesized and their dyeing properties were compared with a disperse dye. Dyeing properties of reactive disperse dyes were strongly influenced by the chemical structure of reactive group. The amount of absorbed reactive disperse dye containing $\alpha$-bromoacrylamide group on polyester fiber was less than the disperse dye, and that on nylon fiber was much higher. When polyester and nylon fiber were simultaneously dyed in a dye pot, nylon fiber absorbed the reactive disperse dye more than polyester fiber. The reactive disperse dye having acrylamide group could reduces difference in color depth to a large extent, but the application of carrier or variation of dyebath pH were not sufficient for giving the same color depth to both fibers. The N/P union fabric could be dyed with the reactive disperse dye and its wash fastness were good to excellent.

• Journal of The Korean Astronomical Society
• /
• v.31 no.2
• /
• pp.141-160
• /
• 1998

We have conducted BV RI CCD surface photometry of three spiral galaxies ESO 598-G009, NGC 1515 and NGC 7456. In order to understand the morphological properties and luminosity distribution characteristics for each galaxy, we derived isophotal map, position angle profile, ellipticity profile, luminosity profile, color profile and color contour map. ESO 598-G009, which has a bright bulge component and a ring, shows a trace of gravitational interaction. NGC 1515 is a spiral galaxy with a bar and dust lane. NGC 7456 shows typical characteristics of a late type spiral galaxy.

• Electrical & Electronic Materials
• /
• v.10 no.8
• /
• pp.763-769
• /
• 1997

In this study we have synthesized Zno:Eu phosphors under various sintering atmospheres and temperatures. The analysis of X-ray diffractometer measurement indicates that for Zno:EuCl$_3$ phosphors sintered in air and vacuum 뗘 exists in the host lattice as Eu$_2$O$_3$and EuOCl respectively. From the photoluminescence for the phosphors sintered in vacuum Eu removes the broad-band emission of the ZnO host consequently isolating the red emission due to Eu$^{3+}$ ion and improves the color purity of red emission. The photoluminescence excitation and time resolving spectrum measurements suggest that energy-transfer process occurres from the self-activated defect center in ZnO host the Eu$^{3+}$ ion which exist in the host lattice in the form of EuOCl.

• Proceedings of the KIEE Conference
• /
• 2006.07b
• /
• pp.1275-1276
• /
• 2006

As developing the information society, Lighting Emitted diode(LED) which is light source for illumination of next generation is attracted public attention. LED have many problem as narrow light view angle, high price, drift phenomenon of color coordinate, high heating problem for lower power, lower weight and small size. So, many researches have continued in a illumination as LED module type. in this problem, heating problem is very important and difficult and that is caused in decreasing phenomenon of brightness and drift phenomenon of color coordinate. so the problem of heating is urgent question for illumination of LED. In this paper, structural design of PCB changed as two type for solving the heating problem. also the properties of heating is analysed and optical properties is measured with heating image camera and spectrometer according to change in this design.