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Lamellar stacked 2-dimensional structure of PEDOT:PSS film for enhanced carrier mobility
김영노,김윤렬,이홍주,배소영,김중현 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.0
Conjugated polymers are promised as next generation materials for organic solar cell, light emitting display, etc. Especially, PEDOT:PSS is one of the most commercial conducting polymers because of its transparency, solution-processiblility and flexible properties. However, it has insufficient electrical conductivity compared to inorganic materials like Si or ITO, based on ordered structures. Most of organic materials have low crystallization degree and amorphous structures. In this work, we get 2-D structured PEDOT:PSS film, improved 3~4 times electrical conductivity through repeated sulfuric acid etching process to overcome this problem. The XPS, raman spectra, optical properties (Transmittance, Haziness, b*… etc.), XRD, AFM and electrical conductivity of the PEDOT:PSS were evaluated. This can be used as transparent electrode materials for electronic devices like organic thin film transistor or OLED.
클럭주기 최소화를 위한 효율적인 연결구조 할당 알고리듬
김영노,이해동,황선영 대한전자공학회 1995 전자공학회논문지-A Vol.32 No.6
This paper presents the design of a performance-driven interconnect allocation algorithm. The algorithm is based on the idea that the clock period can be minimized by balancing the load for each of the communication paths following specific hardware modules. By performing load balancing for only the communication lines on ciritical paths, the proposed algorithm generates interconnection structures with minimum delays. This approach also shows run time efficiency. Experimental results confirm the effectiveness of the algorithm by constructing the interconnection structures such that the clock period can be minimized for several benchmark circuits available from the literature.
김영노,조한결,이진근,조원석,김중현 한국공업화학회 2018 한국공업화학회 연구논문 초록집 Vol.2018 No.0
PEDOT:PSS is a promising next-generation transparent electrode material. PEDOT:PSS can be dispersed in water, so it can be easily utilized through solution processing. In this work, we adopted solution-processed method for enhancing electrical and optical properties of PEDOT:PSS solution. This process can be applicable to mass production and has possibility of application for materials of organic light emitting diodes industies. PEDOT:PSS was first synthesized by emulsion polymerization. Thereafter we designed solution-processed ultrafiltration with acid solution for enhancing electrical properties of PEDOT:PSS. Theses effect can cause PEDOT:PSS to highly conductive and transparency. Additionally the XPS, Raman spectra, Optical properties, AFM, UPS and electrical conductivity of the PEDOT:PSS were evaluated. As a result, the electrical conductivity of PEDOT:PSS was increased from 1100 to 1400 S/cm because of these dual effects of structural and chemical changes.
김영노,석창목,김화중 한국화재소방학회 2007 한국화재소방학회논문지 Vol.21 No.3
The purpose of this study analyzes heat flows and fire behavior through a reduced-scale model experiments about change of wind velocity in underground life space. When the wind velocity is increased the temperature rise time of the fire room was risen fast. And temperature of fire room was increased. And increase of wind velocity displayed maximum temperature at an opening of the fire room. Heat flows by fire spread increase size of smoke occurrence and flame, and displayed high temperature distribution in passageway than inside of neighborhood department promoting eddy flow spread as wind velocity increases. Finally, heat flows are decided by wind and wind velocity at fire of underground life space,and Wind velocity increases, temperature increase and decrease could confirm that is gone fast. 본 연구에서는 지하생활공간을 대상으로 풍속의 변화에 대한 축소모델 실험을 통하여 열유동 및 화재성 상을 분석하였다. 풍속이 증가할수록 화재실의 온도상승 시간은 빨라지고, 실의 온도도 증가하였다. 그리 고 풍속이 증가할수록 화재실의 개구부에서 최고온도를 나타내었다. 화재확산에 따른 열유동은 풍속이 증 가할수록 와류확산을 촉진시켜 연기발생과 화염의 크기를 증가시키고, 인근실의 내부보다 통로에서 높은 온도분포를 나타내었다. 끝으로 지하생활공간의 화재시 열유동은 풍향과 풍속에 의해 화재확산이 결정되 어지고 풍속이 증가할수록 온도증가와 감소는 빠르게 진행됨을 확인할 수 있었다.
지하생활공간 화재시 화재하중에 따른 통로부의 열확산 특성 연구
김영노,이광원,정찬우,김화중 대한건축학회지회연합회 2007 대한건축학회지회연합회 학술발표대회논문집 Vol.2007 No.1
The purpose of this paper is to analyze the fire behavior of underground space, and to supply basis data on the Performance-Based Design. In order to determine fire load and ventilation coefficient which determine the fire temperature and fire continuance time, the authors had investigated inflammableness of target shops by visiting the site of underground. And unit caloric value about inflammableness for respective materials of target shop was calculated. The Heat flow and fire behavior at the fire room and fire spread to adjacent rooms according to fire load changes were investigated.