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Alternative Patterning Process for Realization of Large-Area, Full-Color, Active Quantum Dot Display
Park, Joon-Suh,Kyhm, Jihoon,Kim, Hong Hee,Jeong, Shinyoung,Kang, JoonHyun,Lee, Song-ee,Lee, Kyu-Tae,Park, Kisun,Barange, Nilesh,Han, JiYeong,Song, Jin Dong,Choi, Won Kook,Han, Il Ki American Chemical Society 2016 Nano letters Vol.16 No.11
<P>Although various colloidal quantum dot (QD) coating and patterning techniques have been developed to meet the demands in optoelectronic applications over the past years, each of the previously demonstrated methods has one or more limitations and trade-offs in forming multicolor, high-resolution, or large-area patterns of QDs. In this study, we present an alternative QD patterning technique using conventional photolithography combined with charge-assisted layer-by-layer (LbL) assembly to solve the trade-offs of the traditional patterning processes. From our demonstrations, we show repeatable QD patterning process that allows multicolor QD patterns in both large-area and microscale. Also, we show that the QD patterns are robust against additional photolithography processes and that the thickness of the QD patterns can be controlled at each position. To validate that this process can be applied to actual device applications as an active material, we have fabricated inverted, differently colored, active QD light-emitting device (QD-LED) on a pixelated substrate, which achieved maximum electroluminescence intensity of 23 770 cd/m(2), and discussed the results. From our findings, we believe that our process provides a solution to achieving both high-resolution and large-scale QD pattern applicable to not only display, but also to practical photonic device research and development.</P>
Near-infrared photodetector achieved by chemically-exfoliated multilayered MoS<sub>2</sub> flakes
Park, Min Ji,Park, Kisun,Ko, Hyungduk Elsevier 2018 APPLIED SURFACE SCIENCE - Vol.448 No.-
<P><B>Abstract</B></P> <P>A near-infrared (NIR) photodetector built from chemically exfoliated multilayer MoS<SUB>2</SUB> films was investigated. Devices that are photoresponsive to wavelengths up to 1550 nm were fabricated using 25-nm-thick MoS<SUB>2</SUB> films. To the best of our knowledge, this is the first time such a detector was produced using chemical exfoliation. As the thickness was increased to 25 nm, the MoS<SUB>2</SUB> flakes formed a nearly or fully continuous film with a 2H-dominant phase, and also exhibited enhanced NIR absorption up to 1550 nm. We conjecture that the defects formed during chemical exfoliation affect the intrinsic bandgap of MoS<SUB>2</SUB>, extending its spectral absorption range into the NIR range. Moreover, the responsivity of the device was enhanced by introducing plasmonic Ag nanocrystals.</P> <P><B>Highlights</B></P> <P> <UL> <LI> We fabricated NIR photodetector based on chemically exfoliated multilayered MoS<SUB>2</SUB>. </LI> <LI> By controlling the thickness of the MoS<SUB>2</SUB> films, the photodetectors exhibited photoresponse up to 1550 nm. </LI> <LI> The responsivity and detectivity of the photodetector were fairly enhanced by plasmonic Ag nanocrystals. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Recognition of Transmembrane Protein 39A as a Tumor-Specific Marker in Brain Tumor
Park, Jisoo,Lee, Hyunji,Tran, Quangdon,Mun, Kisun,Kim, Dohoon,Hong, Youngeun,Kwon, So Hee,Brazil, Derek,Park, Jongsun,Kim, Seon-Hwan Korean Society of ToxicologyKorea Environmental Mu 2017 Toxicological Research Vol.33 No.1
Transmembrane protein 39A (TMEM39A) belongs to the TMEM39 family. TMEM39A gene is a susceptibility locus for multiple sclerosis. In addition, TMEM39A seems to be implicated in systemic lupus erythematosus. However, any possible involvement of TMEM39A in cancer remains largely unknown. In the present report, we provide evidence that TMEM39A may play a role in brain tumors. Western blotting using an anti-TMEM39A antibody indicated that TMEM39A was overexpressed in glioblastoma cell lines, including U87-MG and U251-MG. Deep-sequencing transcriptomic profiling of U87-MG and U251-MG cells revealed that TMEM39A transcripts were upregulated in such cells compared with those of the cerebral cortex. Confocal microscopic analysis of U251-MG cells stained with anti-TMEM39A antibody showed that TMEM39A was located in dot-like structures lying close to the nucleus. TMEM39A probably located to mitochondria or to endosomes. Immunohistochemical analysis of glioma tissue specimens indicated that TMEM39A was markedly upregulated in such samples. Bioinformatic analysis of the Rembrandt knowledge base also supported upregulation of TMEM39A mRNA levels in glioma patients. Together, the results afford strong evidence that TMEM39A is upregulated in glioma cell lines and glioma tissue specimens. Therefore, TMEM39A may serve as a novel diagnostic marker of, and a therapeutic target for, gliomas and other cancers.
다단 펌프의 효율증대를 위한 임펠러 형상의 최적화에 대한 수치해석적 연구
박기선(Kisun Park),허남건(Nahmkeon Hur),윤인식(Insik Yoon) 대한기계학회 2013 대한기계학회 춘추학술대회 Vol.2013 No.12
In the present study, performance of multi-stage centrifugal pump was analyzed with various blade angles to predict hydraulic head and flow rate. Rotation of impeller was simulated by the Multi Reference Frames (MRF) technique. The simulation was modeled three-dimensional internal flow with incompressible turbulence which was described by Realizable k-e turbulent model. The blade angle, the blade number and the outlet diameter of impeller are the most important factors to pump performance. In this study, the influence of blade angle on the performance and the efficiency of the pump examined. Hydraulic head, flow rate and torque were extracted by different blade angle. This numerical prediction of pump performance showed good agreement for experimental data. The results showed the specific range of blade angle to maximize performance and efficiency of multi-stage centrifugal pump.
공극의 시간변화를 고려한 3 상 BLDC 모터의 동특성 해석
박기선(Kisun Park),임형빈(Hyungbin Im),정진태(Jintai Chung) 대한기계학회 2009 大韓機械學會論文集A Vol.33 No.10
In this study, vibrations of an electric motor are analyzed when the motor has the interaction between mechanical and electromagnetic behaviors. For this vibration analysis a 3-phase 8-pole brushless DC motor is selected. Vibrations of the motor are influenced by coupled electromechanical characteristics. The variation of air-gap induced by vibration has an influence on the inductance of the motor coil. To analyze dynamic characteristics of the rotor, we studied inductance by the variation of an air-gap. After obtaining the kinetic, potential and magnetic energies for the motor, the equations of motion are derived by using Lagrange’s equation. By applying the Newmark time integration method to the equations, the dynamic responses for the displacements and currents are computed.
Recognition of Transmembrane Protein 39A as a Tumor-Specific Marker in Brain Tumor
Jisoo Park,Hyunji Lee,Quangdon Tran,Kisun Mun,Dohoon Kim,Youngeun Hong,So Hee Kwon,Derek Brazil,Jongsun Park,Seon-Hwan Kim 한국독성학회 2017 Toxicological Research Vol.33 No.1
Transmembrane protein 39A (TMEM39A) belongs to the TMEM39 family. TMEM39A gene is a susceptibility locus for multiple sclerosis. In addition, TMEM39A seems to be implicated in systemic lupus erythematosus. However, any possible involvement of TMEM39A in cancer remains largely unknown. In the present report, we provide evidence that TMEM39A may play a role in brain tumors. Western blotting using an anti-TMEM39A antibody indicated that TMEM39A was overexpressed in glioblastoma cell lines, including U87-MG and U251-MG. Deep-sequencing transcriptomic profiling of U87-MG and U251-MG cells revealed that TMEM39A transcripts were upregulated in such cells compared with those of the cerebral cortex. Confocal microscopic analysis of U251-MG cells stained with anti-TMEM39A antibody showed that TMEM39A was located in dot-like structures lying close to the nucleus. TMEM39A probably located to mitochondria or to endosomes. Immunohistochemical analysis of glioma tissue specimens indicated that TMEM39A was markedly upregulated in such samples. Bioinformatic analysis of the Rembrandt knowledge base also supported upregulation of TMEM39A mRNA levels in glioma patients. Together, the results afford strong evidence that TMEM39A is upregulated in glioma cell lines and glioma tissue specimens. Therefore, TMEM39A may serve as a novel diagnostic marker of, and a therapeutic target for, gliomas and other cancers.
Anomalous thermoelectricity of pure ZnO from 3D continuous ultrathin nanoshell structures
Kim, Kisun,Park, Junyong,Hong, Seokkyoon,Park, Sun Hwa,Jeon, Seong Gi,Ahn, Changui,Song, Jae Yong,Jeon, Seokwoo The Royal Society of Chemistry 2018 Nanoscale Vol.10 No.6
<P>ZnO is a potential thermoelectric material because of its non-toxicity, high thermal stability, and relatively high Seebeck coefficient (<I>S</I>) of metal oxides. However, the extremely low figure of merit (<I>zT</I>), which comes from a high thermal conductivity (<I>κ</I>) over 40 W m<SUP>−1</SUP> K<SUP>−1</SUP>, limits the thermoelectric application of ZnO. In particular, below 500 K, ZnO exhibits a nearly negligible <I>zT</I> (<10<SUP>−3</SUP>), unless a dopant is incorporated into the crystal structure. Here, we propose a new strategy for achieving a reduced <I>κ</I> and a correspondingly increased <I>zT</I> of pure ZnO over a wide temperature range from 333 K to 723 K by forming an ∼72 nm thick, 3D continuous ultrathin nanoshell structure. The suppressed <I>κ</I> of the 3D ZnO film is ∼3.6 W m<SUP>−1</SUP> K<SUP>−1</SUP> at 333 K, which is ∼38 times lower than that of the blanket ZnO film (3.2 μm thick), which was set as a reference. The experimental <I>zT</I> of the 3D ZnO film is ∼0.017 at 333 K, which is the highest value among pure ZnO reported to date and is estimated to increase by ∼0.072 at 693 K according to the Debye-Callaway approach. Large-area (∼1 in<SUP>2</SUP>) fabrication of the 3D ZnO film with high structural uniformity allows the realization of an integrated thermoelectric device, which generates ∼60 mV at a temperature difference of 40 K along the in-plane direction.</P>
윈도우즈 기반 플래시 디스크의 성능 분석을 위한 도구 개발
박성환(Sung-Hwan Park),유현석(Hyun-Seok Yoo),김도윤(Do Yun Kim),박원주(Won-Joo Park),오기선(Kisun Oh),이상원(Sang-Won Lee),박상원(Sangwon Park) 한국정보과학회 2005 한국정보과학회 학술발표논문집 Vol.32 No.1
이동 기기의 저장 장치로 플래시 메모리가 널리 사용되고 있으며 고정 하드 디스크를 대체하는 저장 매체로 부상하고 있다. 그러므로 플래시 메모리의 특성을 잘 이해하고, 최대한 효율적으로 플래시 메모리를 사용할 필요성이 있다. 이러한 역할을 해주는 것은 플래시 내부의 시스템 소프트웨어인 FTL(Flash Translation Layer)이다. FTL은 운영체제가 디스크에 전달하는 블록을 물리적인 플래시 메모리에 맵핑하는 역할을 한다. 그러므로 플래시 메모리의 성능은 FTL 알고리즘이 결정한다. 플래시를 대체한 플래시 디스크에서는 기존의 파일 시스템이 탑재되며 간단한 섹터 기반의 이동형 기기에서와는 다른 특성을 가진다. FTL 성능을 평가하기 위해서는 실제적으로 플래시 메모리가 장착된 제품들이 동작하는 시스템에서 실험을 해야 한다. 많은 플래시 디스크는 윈도우즈에서 동작하므로 윈도우즈의 디스크 I/O를 추출하여 실험을 해야만 한다. 본 논문에서는 윈도우즈에서 물리적인 디스크 I/O 패턴을 추출하여 FTL 알고리즘의 성능을 평가하기 위한 도구 개발에 대하여 설명하고 이에 대한 간단한 결과를 보인다.