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Image reversal photoresist for small molecule organic light-emitting diode applications
Seungjun Yi,전철규,김우영,Kyung-Hee Choi 한국물리학회 2011 Current Applied Physics Vol.11 No.3
We have developed an image reversal photoresist with high thermal stability and electric insulating properties for small molecule organic light-emitting diode (SMOLED) applications. The thermal stability and electric insulating properties were investigated and compared to those of the conventional insulation layer and cathode separator materials of SMOLEDs. Moreover, to verify its applicability and reliability,1.17˝ 96 × RGB (red, green, and blue subpixels) × 96 passive matrix SMOLEDs were fabricated using the image reversal photoresist. This image reversal photoresist makes a single isolation structure,where the insulation layer and cathode separators of SMOLEDs are simultaneously formed by a single layer of image reversal photoresist, applicable to SMOLEDs, thereby reducing the fabrication processes and cutting down the manufacturing cost.
A simplified process for the bus electrodes of low resistance in passive matrix OLEDs
Seungjun Yi,Youn Soo Shin,DaeWoo Ihm 한국물리학회 2009 Current Applied Physics Vol.9 No.3
A simplified process for the bus electrodes of low resistance in passive matrix OLEDs using cathode separators is presented. The cathode separators are patterned both in a peripheral area and in an active area so that the bus electrodes can be formed out of a cathode metal of low resistance when the cathode metal is deposited. Using this simplified process, a single and bi-layer of aluminum and copper were tried out to form the bus and cathode electrodes and the results were analyzed. This method reduces the fabrication processes and lowers the power consumption. A simplified process for the bus electrodes of low resistance in passive matrix OLEDs using cathode separators is presented. The cathode separators are patterned both in a peripheral area and in an active area so that the bus electrodes can be formed out of a cathode metal of low resistance when the cathode metal is deposited. Using this simplified process, a single and bi-layer of aluminum and copper were tried out to form the bus and cathode electrodes and the results were analyzed. This method reduces the fabrication processes and lowers the power consumption.
Ultimate Behavior of Steel Cable-stayed Bridges - I. Rational Ultimate Analysis Method -
Seungjun Kim,Deokhee Won,강영종 한국강구조학회 2016 International Journal of Steel Structures Vol.16 No.2
This paper presents an investigation on the ultimate behavior of steel cable-stayed bridges. In general, various nonlinear factors affect the global behavior of cable-stayed bridges, such as material nonlinearities, cable-sag effect, beam-column effect, large displacement effect, and girder-mast-cable interaction. These effects also affect the ultimate behavior of cable-stayed bridges. Therefore, a rational analysis method should be performed to study the ultimate behavior of cable-stayed bridges. Because of various nonlinearities, the analysis should be based on the theory of nonlinear finite element analysis. Moreover, rational ultimate analysis can reflect characteristics of the design and construction of cable-stayed bridges. In this study, a rational ultimate analysis method for steel cable-stayed bridges is developed and proposed based on the theory of nonlinear finite element analysis. A two-step analysis method is proposed and used in this study. Through this analysis scheme, the structural state under dead load is considered before the live load analysis. The developed program is used to study the ultimate behavior of steel cable-stayed bridges under vertically applied live load cases. Analytical study is used to investigate governing ultimate modes under the considered live load cases. By comparing the analysis results under each live load case, the critical load case is determined. The effects of geometric nonlinearities and material nonlinearities on the ultimate behavior of steel cable-stayed bridges are studied by performing geometric nonlinear analysis, as well as ultimate analysis.
Seungjun Lee,Hyun Kyoung Shon,Hyein Ha,Ja Yeon Lee,Min Chul Suh,Tae Geol Lee,Yongsup Park 한국진공학회 2021 한국진공학회 학술발표회초록집 Vol.2021 No.2
Solution processing of organic light-emitting diodes (OLEDs) layers has recently been studied as the next-generation manufacturing process of OLEDs. However, the device lifetime of solution-processed OLEDs is still inferior to compete with vacuum-deposited OLEDs. To understand a fundamental degradation mechanism of thermally annealed solution-processed OLEDs, we investigated depth profiles of organic layers in degraded solution-processed OLEDs by using X-ray photoelectron spectroscopy and time-of-flight secondary mass spectroscopy with argon gas cluster ion beam sputtering.
Evaluation of Different Erosion Models for Debris Flow Modeling
( Seungjun Lee ),( Hyunuk An ),( Minseok Kim ) 대한지질공학회 2019 대한지질공학회 학술발표회논문집 Vol.2019 No.2
Debris flow triggered by shallow landslides in hillslope catchments is a main geological phenomenon driving landscape changes, and represents an important natural hazard. A number of modeling approaches have been studied to explore the process and damage of debris flows. However, there are still a lot of uncertainties in the erosion-entrainment process although several erosion models have been proposed and used to simulate debris flow. The objective of this study is to test and compare several erosion models for debris flow simulation. Deb2D, the two-dimensional debris flow simulation software based on quadtree-grid, is used to simulate debris flow. The study case was 2011 Mt. Umyeon landslide in the Republic of Korea. The total debris flow volume, maximum velocity and inundated depth resulted from several erosion models were compared to the field survey data. In particular, the spatial distribution of erosion depth was extracted from the LiDAR-based DEM data gauged before and after the event to compare the performance of each erosion model.
Traffic Management for Enhancing Traffic Safety in Winter Season
Seungjun, Lee,Seungkirl, Baek,Hyunsuk, Lee 한국도로학회 2018 한국도로학회 학술대회 발표논문 초록집 Vol.2018 No.05
The objective of this study is to find a way to enhance winter traffic safety. This study has four main contents as follows. Firstly, the characteristic of winter traffic during the snowfall was examined in terms of traffic capacity, travel speed and standard deviation of travel speed. Next, the winter culture including prerequisites for driving and driving skills as well as the standard for snow removal were reviewed. Then, the cases of traffic management in UK, Germany and Japan were reviewed. Finally, the countermeasures to enhance the traffic safety were examined. After that, the variable sectional enforcement for speeding was proposed as a countermeasure to enhance traffic safety by reducing severe travel speed variation. The criteria for the operation of the variable sectional enforcement for speeding were set from 20% to 50% reduction of speed, depending on the amount of snowfall. The sections in which the accidents happened often during the snowfall were considered as the locations to implement the variable sectional enforcement for speeding.