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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.
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.
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.
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.
Compliant Thermoelectric Generators Toward Self-Powered Flexible Electronics
Seungjun Chung(정승준) 한국고분자학회 2021 한국고분자학회 학술대회 연구논문 초록집 Vol.46 No.2
Softening of thermoelectric generators (TEGs) allows conformal contact with arbitrary-shaped heat sources, which offers an opportunity to realize self-powered flexible applications. However, existing flexible thermoelectric devices inevitably exhibit reduced thermoelectric conversion efficiency due to the parasitic heat loss in high-thermal-impedance polymer substrates and poor thermal contact arising from rigid interconnects. In this talk, I would like to introduce various state of the art flexible thermoelectrics for self-powered applications. In particular, our recent efforts to improve the thermoelectric performance of compliant organic/inorganic TEGs will be highlighted which facilitate to achieve high energy conversion efficiency in TEGs capable of conforming to 3D surfaces of heat sources simultaneously.