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Ko, Sangwon,Choi, Hyunbong,Kang, Moon-Sung,Hwang, Hyonseok,Ji, Heesun,Kim, Jinho,Ko, Jaejung,Kang, Youngjin Royal Society of Chemistry 2010 Journal of materials chemistry Vol.20 No.12
<P>Three new organic dyes that contain the dithienosilole (DTS) moiety as spacer have been synthesized and their photophysical/electrochemical properties, theoretical calculation and dye-sensitized solar cell (DSSC) performance have been investigated. The overall conversion efficiencies for DSSCs based on these dyes range from 6.73 to 7.50%, comparable to a (3–5′-[<I>N</I>,<I>N</I>-bis(9,9-dimethylfluorene-2-yl)phenyl]2,2′-bithiophene-5-yl}-2-cyanoacrylic acid (<B>JK-2</B>)-sensitized device (7.63%), fabricated and measured under the same experimental conditions. The DSSC constructed from one of the three compounds shows a higher open-circuit voltage (<I>V</I><SUB>OC</SUB>) compared to those of the other two dye sensitized solar cells due to an increased electron lifetime (<I>τ</I><SUB>e</SUB>) in the conduction band of TiO<SUB>2</SUB>.</P> <P>Graphic Abstract</P><P>Organic sensitizers bearing dithienosilole (DTS) segment as spacer, DTS-Me<SUB>2</SUB>, DTS-Ph<SUB>2</SUB> and DTS-MePh, exhibit solar conversion efficiencies of 6.73, 7.50 and 6.81%, respectively. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=b926163j'> </P>
A 19-mW 2.6-mm<sup>2</sup> L1/L2 dual-band CMOS GPS receiver
Ko, Jinho,Kim, Jongmoon,Cho, Sanghyun,Lee, Kwyro IEEE 2005 IEEE journal of solid-state circuits Vol.40 No.7
This paper presents the design and implementation of an L1/L2 dual-band global positioning system (GPS) receiver. Dual-conversion with a low-IF architecture was used for dual-band operation. The receiver is composed of an RF preamplifier, down-conversion mixers, a variable-gain channel filter, a 2-bit analog-to-digital converter, and the full phase-locked-loop synthesizer including an on-chip voltage controlled oscillator. Fabricated in a 0.18-μm CMOS technology, the receiver exhibits maximum gain of 95 dB and noise figures of 8.5 and 7.5 dB for L1 and L2, respectively. An on-chip variable-gain channel filter provides IF image rejection of 20 dB and gain control range over 60 dB. The receiver consumes 19 mW from a 1.8-V supply while occupying a 2.6-mm<SUP>2</SUP> die area including the ESD I/O pads.
Jinho Song,Junhee Lee,Kwanghee Ko,Won-Don Kim,Tae-Won Kang,Jeung-Youb Kim,Jong-Ho Nam 한국CDE학회 2021 Journal of computational design and engineering Vol.8 No.1
In this paper, a method for classifying 3D unorganized points into interior and boundary points using a deep neural network is proposed. The classification of 3D unorganized points into boundary and interior points is an important problem in the nonuniform rational B-spline (NURBS) surface reconstruction process. A part of an existing neural network PointNet, which processes 3D point segmentation, is used as the base network model. An index value corresponding to each point is proposed for use as an additional property to improve the classification performance of the network. The classified points are then provided as inputs to the NURBS surface reconstruction process, and it has been demonstrated that the reconstruction is performed efficiently. Experiments using diverse examples indicate that the proposed method achieves better performance than other existing methods.