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Park, In Soo,Eom, Kilho,Son, Jongsang,Chang, Woo-Jin,Park, Kidong,Kwon, Taeyun,Yoon, Dae Sung,Bashir, Rashid,Lee, Sang Woo American Chemical Society 2012 ACS NANO Vol.6 No.10
<P>The simultaneous investigation of a large number of events with different types of intermolecular interactions, from nonequilibrium high-force pulling assays to quasi-equilibrium unbinding events in the same environment, can be very important for fully understanding intermolecular bond-rupture mechanisms. Here, we describe a novel dielectrophoretic force spectroscopy technique that utilizes microsized beads as multifunctional probes for parallel measurement of intermolecular forces with an extremely wide range of force rate (10<SUP>–4</SUP> to 10<SUP>4</SUP> pN/s) inside a microfluidic device. In our experiments, various forces, which broadly form the basis of all molecular interactions, were measured across a range of force loading rates by multifunctional probes of various diameters with a throughput of over 600 events per mm<SUP>2</SUP>, simultaneously and in the same environment. Furthermore, the individual bond-rupture forces, the parameters for the characterization of entire energy landscapes, and the effective stiffness of the force spectroscopy were determined on the basis of the measured results. This method of determining intermolecular forces could be very useful for the precise and simultaneous examination of various molecular interactions, as it can be easily and cost-effectively implemented within a microfluidic device for a range of applications including immunoassays, molecular mechanics, chemical and biological screening, and mechanobiology.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/ancac3/2012/ancac3.2012.6.issue-10/nn302202t/production/images/medium/nn-2012-02202t_0006.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/nn302202t'>ACS Electronic Supporting Info</A></P>
GaP–ZnS Pseudobinary Alloy Nanowires
Park, Kidong,Lee, Jung Ah,Im, Hyung Soon,Jung, Chan Su,Kim, Han Sung,Park, Jeunghee,Lee, Chang-Lyoul American Chemical Society 2014 NANO LETTERS Vol.14 No.10
<P>Multicomponent nanowires (NWs) are of great interest for integrated nanoscale optoelectronic devices owing to their widely tunable band gaps. In this study, we synthesize a series of (GaP)(1x)(ZnS)(x) (0 = x = 1) pseudobinary alloy NWs using the vapor transport method. Compositional tuning results in the phase evolution from the zinc blende (ZB) (x < 0.4) to the wurtzite (WZ) phase (x > 0.7). A coexistence of ZB and WZ phases (x = 0.40.7) is also observed. In the intermediate phase coexistence range, a coreshell structure is produced with a composition of x = 0.4 and 0.7 for the core and shell, respectively. The band gap (2.43.7 eV) increases nonlinearly with increasing x, showing a significant bowing phenomenon. The phase evolution leads to enhanced photoluminescence emission. Strikingly, the photoluminescence spectrum shows a blue-shift (70 meV for x = 0.9) with increasing excitation power, and a wavelength-dependent decay time. Based on the photoluminescence data, we propose a type-II pseudobinary heterojunction band structure for the single-crystalline WZ phase ZnS-rich NWs. The slight incorporation of GaP into the ZnS induces a higher photocurrent and excellent photocurrent stability, which opens up a new strategy for enhancing the performance of photodetectors.</P>
‘Living cantilever arrays’ for characterization of mass of single live cells in fluids
Park, Kidong,Jang, Jaesung,Irimia, Daniel,Sturgis, Jennifer,Lee, James,Robinson, J. Paul,Toner, Mehmet,Bashir, Rashid Royal Society of Chemistry 2008 Lab on a chip Vol.8 No.7
<P>The size of a cell is a fundamental physiological property and is closely regulated by various environmental and genetic factors. Optical or confocal microscopy can be used to measure the dimensions of adherent cells, and Coulter counter or flow cytometry (forward scattering light intensity) can be used to estimate the volume of single cells in a flow. Although these methods could be used to obtain the mass of single live cells, no method suitable for directly measuring the mass of single adherent cells without detaching them from the surface is currently available. We report the design, fabrication, and testing of ‘living cantilever arrays’, an approach to measure the mass of single adherent live cells in fluid using silicon cantilever mass sensor. HeLa cells were injected into microfluidic channels with a linear array of functionalized silicon cantilevers and the cells were subsequently captured on the cantilevers with positive dielectrophoresis. The captured cells were then cultured on the cantilevers in a microfluidic environment and the resonant frequencies of the cantilevers were measured. The mass of a single HeLa cell was extracted from the resonance frequency shift of the cantilever and was found to be close to the mass value calculated from the cell density from the literature and the cell volume obtained from confocal microscopy. This approach can provide a new method for mass measurement of a single adherent cell in its physiological condition in a non-invasive manner, as well as optical observations of the same cell. We believe this technology would be very valuable for single cell time-course studies of adherent live cells.</P> <P>Graphic Abstract</P><P>A single HeLa cell was captured and cultured on a silicon cantilever and then its mass was measured by monitoring the change in resonant frequency of the cantilever. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=b803601b'> </P>
GaAsSe Ternary Alloy Nanowires for Enhanced Photoconductivity
Park, Kidong,Lee, Jinha,Kim, Doyeon,Seo, Jaemin,Lee, Jung Ah,Kwak, In Hye,Kwon, Ik Seon,Ahn, Jae Pyoung,Park, Jeunghee American Chemical Society 2019 The Journal of Physical Chemistry Part C Vol.123 No.6
<P>Alloyed semiconductor nanowires (NWs) are of great interest for next-generation integrated optoelectronic nanodevices owing to their tunable band gap and emission wavelength. In this study, we synthesized the GaAsSe ternary alloy nanowires (NWs) with various compositions between GaAs and Ga<SUB>2</SUB>Se<SUB>3</SUB> using chemical vapor transport method. The band gap was continuously tuned in the range of 1.5-2.1 eV because of the completely miscible solid solution at all compositions. The alloy NWs (including Ga<SUB>2</SUB>Se<SUB>3</SUB>) consisted of a cubic phase with the [011] growth direction, in contrast with the GaAs NWs grown along the [111] direction. In particular, the GaAs<SUB>1-<I>x</I></SUB>Se<SUB><I>x</I></SUB> (<I>x</I> = 0.3) alloy NWs were grown from Ga-rich Au nanoparticles such as cubic-phase AuGa<SUB>2</SUB> and had a defect-free single-crystalline nature. X-ray photoelectron spectroscopy analysis reveals much less surface oxide layers for <I>x</I> = 0.3, suggesting that Se incorporation at this composition effectively diminishes the surface defects. We fabricated photodetectors using the individual NW, showing that the photocurrent decreases with the increasing Se composition. The alloy composition significantly diminished the dark current and thus greatly enhanced the photosensitivity for <I>x</I> = 0.3.</P> [FIG OMISSION]</BR>
건설분야 유비쿼터스 기술 적용 현황 및 보안 이슈사항에 대한 제언
박기동(Kidong Park) 한국정보보호학회 2009 情報保護學會誌 Vol.19 No.3
디지털 컨버전스는 IT산업 내에서 기기 및 네트워크간의 융합을 중심으로 전개되어 왔으나 최근에 와서는 IT의 활용범위가 보다 확대되면서 타 산업 기술과의 접목이 활발히 전개되고 있다. 기기 또는 네트워크간의 통합이나 동일산업 내의 서비스 통합에서 벗어나, 의료, 자동차, 건설 등 다양한 산업과 IT산업이 결합되는 이종산업간 융합이 진행 중이다. 특히 최근에 와서는 오래된 역사를 갖는 건설 분야와 반세기 동안 비약적인 발전을 이룩한 IT 분야가 서로 융ㆍ복합되어 새로운 형태의 서비스를 탄생시키고 있다. 건설-IT 기술의 융ㆍ복합을 통해서 서비스가 고도화가 되고, 지능화 되고 있으나, 이런 편리함에 비례하여 보안적인 문제들이 많이 생겨나고 있다. 본 고에서는 건설분야 IT 기술 적용 현황에 대해서 분석하고 건설-IT 융ㆍ복합 환경에서 발생되는 보안적인 취약점 및 이슈사항을 분석을 통해 건설-IT 융ㆍ복합 기술이 나아가야할 방향을 모색하고자 한다.