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김지선(JiSun Kim),박기찬(KeeChan Park),오환술(HwanSool Oh) 대한전자공학회 2012 電子工學會論文誌-SD (Semiconductor and devices) Vol.49 No.1
We have developed a new gate driver circuit for liquid crystal displays using oxide thin-film transistors (TFTs). In the new gate driver, negative gate bias is applied to turn off the oxide TFTs because the oxide TFT occasionally has negative threshold voltage (VT). In addition, we employed three parallel pull-down TFTs that are turned on in turns to enhance the stability. SPICE simulation showed that the proposed circuit worked successfully covering the VT range of -3 V ~ +6 V And fabrication results confirmed stable operation of the new circuit using oxide TFTs. 산화물 박막트랜지스터를 이용하여 액정 디스플레이 패널에 내장할 수 있는 새로운 게이트 드라이버 회로를 설계하고 제작하였다. 산화물 박막트랜지스터는 문턱전압이 음의 값을 갖는 경우가 많기 때문에 본 회로에서는 음의 게이트 전압을 인가하여 트랜지스터를 끄는 방법을 적용하였다. 또한 세 개의 풀다운 트랜지스터를 병렬로 배치하고 번갈아 사용하므로 안정적인 동작이 가능하다. 제안한 회로는 트랜지스터의 문턱전압이 -3 V 에서 +6 V인 범위에서 정상적으로 동작하는 것을 시뮬레이션을 통해서 확인하였으며, 실제로 유리 기판 상에 제작하여 안정적으로 동작하는 것을 검증하였다.
Low Power Digital Logic Gate Circuits Based on N-Channel Oxide TFTs
임도(Tao Ren),박기찬(KeeChan Park),오환술(HwanSool Oh) 大韓電子工學會 2011 電子工學會論文誌-SD (Semiconductor and devices) Vol.48 No.3
N-channel 산화물 박막 트랜지스터(Thin Film Transistor, 이하 TFT)만을 이용한 저소비전력 inverter, NAND, NOR의 논리 게이트 회로를 제안한다. 제안된 회로는 asymmetric feed-through와 bootstrapping을 이용해서 pull-up, pull-down 스위치가 동시에 켜지지 않도록 설계하였다. 그 결과로 출력신호 전압 범위가 입력신호 전압과 동일하고 정전류가 흐르지 않는다. 인버터는 5개의 TFT와 2개의 capacitor로, NAND 및 NOR 게이트는 각각 10개의 TFT와 4개의 capacitor로 구성된다. 산화물 TFT 모델을 사용하여 SPICE 시뮬레이션을 수행하여 제안된 회로의 동작을 성공적으로 검증하였다. Low-power logic gates, i.e. inverter, NAND, and NOR, are proposed employing only n-channel oxide thin film transistors (TFTs). The proposed circuits were designed to prevent the pull-up and pull-down switches from being turned on simultaneously by using asymmetric feed-through and bootstrapping, thereby exhibited same output voltage swing as the input signal and no static current. The inverter is composed of 5 TFTs and 2 capacitors. The NAND and the NOR gates consist of 10 TFTs and 4 capacitors respectively. The operations of the logic gates were confirmed successfully by SPICE simulation using oxide TFT model.
P181 Secondary cutaneous DLBCL has a higher IPI score and worse prognosis than DLBCL, leg type
( Hojeong Shin ),( Woojin Lee ),( Kwanghee Won ),( Chonghyun Won ),( Sungeun Chang ),( Jeeho Choi ),( Keechan Moon ),( Chansik Park ),( Jooryung Huh ),( Cheolwon Suh ),( Miwoo Lee ) 대한피부과학회 2016 대한피부과학회 학술발표대회집 Vol.68 No.2
<div style="display:none">fiogf49gjkf0d</div><div style="display:none">fiogf49gjkf0d</div><div style="display:none">fiogf49gjkf0d</div><div style="display:none">fiogf49gjkf0d</div><div style="display:none">fiogf49gjkf0d</div><div style="display:none">fiogf49gjkf0d</div><div style="display:none">fiogf49gjkf0d</div> Background: Differences in skin lesions and survival data for cutaneous diffuse large B-cell lymphoma (DLBCL) depending on primary tumor site are currently unknown. Objectives: we aimed to analyze the clinical features of skin lesions and survival outcomes of cutaneous DLBCL according to the primary tumor site. Methods: Forty-seven patients with cutaneous DLBCL were classified as primary cutaneous DLBCL or cutaneous DLBCL secondary to primary disease. Clinical features, survival outcomes, and prognostic factors were analyzed using patient medical records. Survival outcomes were analyzed using the Kaplan.Meier method and compared using the log-rank test. Results: Although skin lesion characteristics did not significantly differ between groups, secondary cutaneous DLBCL more commonly presented disseminated skin lesions that involved multiple anatomical sites. Primary cutaneous DLBCL demonstrated a less aggressive clinical course and better survival outcomes than secondary cutaneous DLBCL. Disseminated skin lesions and a location on the leg significantly affected the prognosis of primary cutaneous DLBCL. The multiplicity of skin lesions and time point of cutaneous involvement were associated with prognosis in secondary cutaneous DLBCL. Conclusion: Although the clinical features of skin lesions were similar regardless of subgroup, survival outcomes and prognostic factors differed depending on the primary tumor site of cutaneous DLBCL.
Light Sensing in a Photoresponsive, Organic-Based Complementary Inverter
Kim, Sungyoung,Lim, Taehoon,Sim, Kyoseung,Kim, Hyojoong,Choi, Youngill,Park, Keechan,Pyo, Seungmoon American Chemical Society 2011 ACS APPLIED MATERIALS & INTERFACES Vol.3 No.5
<P>A photoresponsive organic complementary inverter was fabricated and its light sensing characteristics was studied. An organic circuit was fabricated by integrating <I>p</I>-channel pentacene and <I>n</I>-channel copper hexadecafluorophthalocyanine (F16CuPc) organic thin-film transistors (OTFTs) with a polymeric gate dielectric. The F16CuPc OTFT showed typical <I>n</I>-type characteristics and a strong photoresponse under illumination. Whereas under illumination, the pentacene OTFT showed a relatively weak photoresponse with typical p-type characteristics. The characteristics of the organic electro-optical circuit could be controlled by the incident light intensity, a gate bias, or both. The logic threshold (<I>V</I><SUB>M</SUB>, when <I>V</I><SUB>IN</SUB> = <I>V</I><SUB>OUT</SUB>) was reduced from 28.6 V without illumination to 19.9 V at 6.94 mW/cm<SUP>2</SUP>. By using solely optical or a combination of optical and electrical pulse signals, light sensing was demonstrated in this type of organic circuit, suggesting that the circuit can be potentially used in various optoelectronic applications, including optical sensors, photodetectors and electro-optical transceivers.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/aamick/2011/aamick.2011.3.issue-5/am101284m/production/images/medium/am-2010-01284m_0005.gif'></P>