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박승옥,임정욱 대진대학교 1998 大眞論叢 Vol.6 No.-
The spectroradiometer is one of essential instrument for spectrum analysis of CRT display, LCD, or light source. It becomes widly used in industries as well as laboratories. In the study, a compact, low-cost spectroradiometer is designed with the development of simple scanning device. The process of wavelength and spectral responsibility calibration is described. Also the result of performance test is shown and some problems are discussed.
Frequency-Selective Beamforming Array Antenna Systems with Frequency-Dependent Phase Shifters
Jung Ouk Kim,Won-Sang Yoon,Sang-Min Han 한국전자파학회JEES 2019 Journal of Electromagnetic Engineering and Science Vol.19 No.4
A frequency-selective beamforming array antenna system is proposed for next-generation mobile applications. Whereas a conventional phased array steers antenna beams in the same direction, the proposed system involves a channel-selective beam for each frequency channel using RF/analog processing. A frequency-dependent phase shifter is designed with controllable phase slopes using reconfigurable transmission line configuration. Wideband frequency-dependent phase bits of 0°, ±90°, ±120°, ±180°, ±240°, and ±270° phase differences are achieved for a frequency band from 3.4 ㎓ to 3.7 ㎓. A wideband planar antenna element with a dual-finger monopole and an 8-way wideband matched feedline are applied to the proposed system. From the experimental results, the frequency-selective beamforming array presents simultaneous channel-selective beams with steering angles of up to about ±40°. The adjustable beamforming system can achieve inter-beam hand-off for 5G mobile applications.
Whole-exome sequencing identifies recurrent <i>AKT1</i> mutations in sclerosing hemangioma of lung
Jung, Seung-Hyun,Kim, Min Sung,Lee, Sung-Hak,Park, Hyun-Chun,Choi, Hyun Joo,Maeng, Leeso,Min, Ki Ouk,Kim, Jeana,Park, Tae In,Shin, Ok Ran,Kim, Tae-Jung,Xu, Haidong,Lee, Kyo Young,Kim, Tae-Min,Song, Sa National Academy of Sciences 2016 PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF Vol.113 No.38
<P>Pulmonary sclerosing hemangioma (PSH) is a benign tumor with two cell populations (epithelial and stromal cells), for which genomic profiles remain unknown. We conducted exome sequencing of 44 PSHs and identified recurrent somatic mutations of AKT1 (43.2%) and beta-catenin (4.5%). We used a second subset of 24 PSHs to confirm the high frequency of AKT1 mutations (overall 31/68, 45.6%; p.E17K, 33.8%) and recurrent beta-catenin mutations (overall 3 of 68, 4.4%). Of the PSHs without AKT1 mutations, two exhibited AKT1 copy gain. AKT1 mutations existed in both epithelial and stromal cells. In two separate PSHs from one patient, we observed two different AKT1 mutations, indicating they were not disseminated but independent arising tumors. Because the AKT1 mutations were not found to co-occur with beta-catenin mutations (or any other known driver alterations) in any of the PSHs studied, we speculate that this may be the single-most common driver alteration to develop PSHs. Our study revealed genomic differences between PSHs and lung adenocarcinomas, including a high rate of AKT1 mutation in PSHs. These genomic features of PSH identified in the present study provide clues to understanding the biology of PSH and for differential genomic diagnosis of lung tumors.</P>