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차세대 지능형 소자 구현을 위한 모노리식 3D 집적화 기술 이슈
문제현,남수지,주철웅,성치훈,김희옥,조성행,박찬우,Moon, J.,Nam, S.,Joo, C.W.,Sung, C.,Kim, H.O.,Cho, S.H.,Park, C.W. 한국전자통신연구원 2021 전자통신동향분석 Vol.36 No.3
Since the technical realization of self-aligned planar complementary metal-oxide-semiconductor field-effect transistors in 1960s, semiconductor manufacturing has aggressively pursued scaling that fruitfully resulted in tremendous advancement in device performances and realization of features sizes smaller than 10 nm. Due to many intrinsic material and technical obstacles, continuing the scaling progress of semiconductor devices has become increasingly arduous. As an effort to circumvent the areal limit, stacking devices in a three-dimensional fashion has been suggested. This approach is commonly called monolithic three-dimensional (M3D) integration. In this work, we examined technical issues that need to be addressed and overcome to fully realize energy efficiency, short latency and cost competency. Full-fledged M3D technologies are expected to contribute to various new fields of artificial intelligence, autonomous gadgets and unknowns, which are to be discovered.
유기 랭킨 사이클용 스크롤 팽창기 성능 시험에 관한 연구
문제현(Je-Hyeon Moon),박근태(Keun-Tae Park),김현진(Hyun-Jin Kim) 대한설비공학회 2014 설비공학 논문집 Vol.26 No.4
An algebraic scroll expander has been fabricated and tested in a R134a Rankine cycle with heat source of 20 kW. For the operating conditions of 20~26 bar and 90~93℃ at the expander inlet and 8~9 bar at the outlet, the expander produced the shaft output power of about 0.6~0.7 kW in the operating speed range of 1500~2000 rpm. These correspond to the expander efficiency of 40~45%. The volumetric efficiency increased with increasing of the expander speed, reaching to 80% at 2000 rpm. Comparing to numerical simulation results, mechanical efficiency from the test data was found to be considerably low by as much as 30%, indicating that reduction in the frictional loss should be made to improve the scroll expander efficiency.
문제현(Je-Hyeon Moon),이영성(Young-Sung Lee),박근태(Keun-Tae Park),김현진(Hyun-Jin Kim) 대한설비공학회 2013 대한설비공학회 학술발표대회논문집 Vol.2013 No.6
A scroll expander with an algebraic scroll profile has been designed in order to study its applicability as a power converter in a R134a Rankine cycle for waste heat recovery of a passenger car with 3.5 L gasoline engine. Performance of the designed scroll expander has been calculated by numerical simulation. From waste heat recovery of exhaust gas and engine coolant over the vehicle speed of 60 km/hr∼120 km/hr, the scroll expander was calculated to produce the shaft output power of 0.61 kW∼2.6 kW, being equivalent to 6.8%∼7.9% of the engine drive power. The expander performance is quite sensitive to the clearance between fixed and orbiting scrolls. With increasing the clearance from 10 ㎛ to 20 ㎛, the expander output decreases by 12.8∼47.2%, depending on the vehicle speed, whilst it increases by 3.6∼15.8% with decreasing the clearance to 5 ㎛.
Spontaneously formed organic wrinkle structure for top-emitting organic light emitting diodes
장상수,문제현,조현수,주철웅,이종희,신진욱,박승구,조남성,양성윤,권병화 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.80 No.-
Due to the imperfections of top metal electrodes, top-emitting organic light emitting diodes (TEOLEDs)suffer low efficiencies and non-uniform angular emission spectral characteristics. We demonstrate anovel and simple method of overcoming these drawbacks by directly forming wrinkles on the thinfilmencapsulation (TFE) surface of TEOLEDs. The developed method relies on the use of a liquid prepolymerthat spontaneously forms randomly distributed micron-sized wrinkles upon exposure to ultra-violetlight. The wrinkles contribute to the extraction of light confined in the air mode by widening the angle ofthe escape cone, leading to a 1.4-fold increase in the current efficiency. Due to the spatial randomnessof the organic wrinkle structure, almost negligible spectral angular dependency was achieved. As a meritof the simple process at room temperature without complicated processes such as patterning andvacuum processes, the developed organic wrinkle structure can be directly used to enhance thecharacteristics of TEOLEDs, and is expandable toflexible OLEDs and various optoelectronic devices.
Luminescence enhancement of OLED lighting panels using a microlens array film
한준한,문제현,조두희,신진욱,추혜용,이정익,조남성,이종희 한국정보디스플레이학회 2018 Journal of information display Vol.19 No.4
The enhancement of the luminance of organic light-emitting diode (OLED) panels with various areas (2.25–6084mm2) using a microlens array (MLA) film was investigated. The luminance enhancement was dependent on the viewing angle, and the largest enhancement (64%) was observed in the normal direction while 60 and 18% enhancements were observed at 60 and 30°, which led to lower enhancement (38%) of the total luminous flux compared with the luminance enhancement (64%) in the normal direction. The luminance enhancement with the MLA film also depended on the panel area, and the smaller panels showed lower luminance enhancement than the larger ones. As for the small panels, the straying light beyond the panel areas significantly affected the luminance of the panels, and over 60% luminance enhancement was observed in the normal direction for the large panels (2500 and 6084mm2) with the MLA film while only 48 and 58% luminance enhancements were observed at the small panels (2.25 and 70mm2).