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Vertical nanocolumn-assisted pluripotent stem cell colony formation with minimal cell-penetration
Kim, Hyunju,Kang, Dong Hee,Koo, Kyung Hee,Lee, Seyeong,Kim, Seong-Min,Kim, Janghwan,Yoon, Myung-Han,Kim, So Yeon,Yang, Eun Gyeong The Royal Society of Chemistry 2016 Nanoscale Vol.8 No.42
<P>The biological applications of vertical nanostructures mostly rely on their intracellular accessibility through the cellular membrane by promoting cell-to-nanostructure interactions. Herein, we report a seemingly counter-intuitive approach for the spontaneous formation of mouse induced pluripotent stem cell (iPSC)-derived three-dimensional spherical colonies with unlimited self-renewal and differentiation potential. The comprehensive analyses of iPSCs cultured on vertical silicon nanocolumn arrays (vSNAs) with various nanocolumn geometries show reduced cell-to-substrate adhesion and enhanced cell-to-cell interactions under optimized vSNA conditions, successfully accommodating the spontaneous production of iPSC-derived spherical colonies. Remarkably, these colonies which were only minimally penetrated by and thereby easily harvested from wafer-sized vSNAs display a substantial increase in pluripotency marker expression and successfully differentiate into three germ layers. Our vSNAs capable of large-scale fabrication, efficient for spherical colony formation, and reusable for multiple iPSC culture could serve as a broad-impact culture platform for stem cell research.</P>
The introduction of a perovskite seed layer for high performance perovskite solar cells
Jeong, Jaeki,Kim, Hak-Beom,Yoon, Yung Jin,An, Na Gyeong,Song, Seyeong,Kim, Jae Won,Kim, Minjin,Jang, Hyungsu,Kim, Dong Suk,Kim, Gi-Hwan,Kim, Jin Young The Royal Society of Chemistry 2018 Journal of Materials Chemistry A Vol.6 No.41
<P>Processing for obtaining compact and uniform perovskite photoactive layers has been intensively studied over the last few years to achieve high power conversion efficiencies (PCEs) in solar cells. Particularly, high quality crystal growth of perovskite layers is critical to enhance device performance. We demonstrate an easy and effective new process for high efficiency p-i-n planar heterojunction structures of perovskite solar cells (PeSCs) by using a compact seed perovskite layer (CSPL). The CSPL assists vertical growth of perovskite crystals and obtains the highly crystalline perovskite photoactive layer, which leads to the reduction in the charge transfer resistance and a longer photoluminescence lifetime. The PeSC device with a CSPL shows a remarkably improved PCE, from 15.07% to 19.25%, with a record open circuit voltage (<I>V</I>OC) of 1.16 V in the p-i-n structure with pure crystal perovskite and negligible current density-voltage hysteresis. Additionally, a PCE of 20.37% was achieved in CSPL assisted n-i-p structure PeSCs.</P>
Kim, Hak-Beom,Choi, Hyosung,Jeong, Jaeki,Kim, Seongbeom,Walker, Bright,Song, Seyeong,Kim, Jin Young RSC Pub 2014 Nanoscale Vol.6 No.12
<P>We investigate mixed solvents of N,N-dimethylformamide (DMF) and γ-butyrolactone (GBL) to produce the smooth surface of a perovskite film and uniform crystal domains. This ideal morphology from mixed solvents enhances the power conversion efficiency to over 6% by improving the exciton dissociation efficiency and reducing the recombination loss at both interfaces of PEDOT:PSS/perovskite and perovskite/PCBM.</P>
Strong contact coupling of neuronal growth cones with height-controlled vertical silicon nanocolumns
Kim, Seong-Min,Lee, Seyeong,Kim, Dongyoon,Kang, Dong-Hee,Yang, Kisuk,Cho, Seung-Woo,Lee, Jin Seok,Choi, Insung S.,Kang, Kyungtae,Yoon, Myung-Han SPRINGER SCIENCE + BUSINESS MEDIA 2018 NANO RESEARCH Vol.11 No.5
Design and Vibration Analysis of Tri-axis Linear Vibratory MEMS Gyroscope
Seok, Seyeong,Moon, Sanghee,Kim, Kanghyun,Kim, Suhyeon,Yang, Seongjin,Lim, Geunbae The Korean Sensors Society 2017 센서학회지 Vol.26 No.4
In this study, the design of a tri-axis micromachined gyroscope is proposed and the vibration characteristic of the structure is analyzed. Tri-axis vibratory gyroscopes that utilize Coriolis effect are the most commonly used micromachined inertial sensors because of their advantages, such as low cost, small packaging size, and low power consumption. The proposed design is a single structure with four proof masses, which are coupled to their adjacent ones. The coupling springs of the proof masses orthogonally transfer the driving vibrational motion. The resonant frequencies of the gyroscope are analyzed by finite element method (FEM) simulation. The suspension beam spring design of proof masses limits the resonance frequencies of four modes, viz., drive mode, pitch, roll and yaw sensing mode in the range of 110 Hz near 21 kHz, 21173 Hz, 21239 Hz, 21244 Hz, and 21280 Hz, respectively. The unwanted modes are separated from the drive and sense modes by more than 700 Hz. Thereafter the drive and the sense mode vibrations are calculated and simulated to confirm the driving feasibility and estimate the sensitivity of the gyroscope. The cross-axis sensitivities caused by driving motion are 1.5 deg/s for both x- and y-axis, and 0.2 deg/s for z-axis.
인텔리전트 에이전트와의 멀티모달 인터랙션을 위한 열 피드백
김세영(Seyeong Kim),남택진(Tek-Jin Nam) 한국HCI학회 2018 한국HCI학회 학술대회 Vol.2018 No.1
인공 지능 기술의 발달로 인텔리전트 에이전트에 관한 관심과 서비스가 증가하고 있다. 인텔리전트 에이전트는 주로 실용적인 도움을 주는 기술로 여겨지지만, 사용자에게 감성적 측면에서의 만족을 제공할 가능성 또한 가진다. 하지만 기존의 인텔리전트 에이전트와의 인터랙션 방식은 음성이나 텍스트 같은 언어적 요소에 국한되어있어 풍부한 정보/컨텐츠를 전달에 어려움이 있고, 현실감을 재현하고 높은 몰임감을 유도하는 데 한계를 가진다. 본 연구에서는 이러한 한계를 극복하고 인텔리전트 에이전트의 감성적 측면의 사용성을 극대화하고자 열을 매개체로 한 멀티모달 인터랙션 방법을 제시한다. 열은 일반적인 촉각 매체와 다르게 긍정적인 감정을 불러일으키는 속성, 비방해적이고 자연스러운 속성 및 현실감을 증대하는 속성을 가진다는 점에서 인텔리전트 에이전트의 촉각 피드백 매체로서 다양한 가능성을 가진다. 본 연구에서는 열 피드백의 효과 및 가능성을 보다 구체적으로 탐색하기 위해, 프로토타입을 개발해 실험을 진행하였다. 실험 결과 열피드백이 음성 정보를 풍부하게 이해하는 데 도움을 주었고, 감성 경험을 증진해 줄 수 있었음을 확인하였다.