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Receiver Hop-Error Correction for Differential Frequency Hopping
Stephen Fahey,Lim Nguyen 한국통신학회 2021 한국통신학회 학술대회논문집 Vol.2021 No.2
Differential Frequency Hopping (DFH) is a spread-spectrum communication technique in which the current hop frequency is determined by a Frequency Transfer Function (FTF) that relies upon the current data symbol and previous hop frequency. Channel noise may cause a detected hop frequency to be received in error. This paper proposes a method which utilizes knowledge of the hopping scheme to correct for receiver hop errors and improve system performance.
Dynamic Frequency Transfer Function for Differential Frequency Hopping System
Stephen Fahey,Lim Nguyen 한국통신학회 2020 한국통신학회 학술대회논문집 Vol.2020 No.11
Differential Frequency Hopping (DFH) is a spread-spectrum communication technique in which the current hop frequency is determined by a Frequency Transfer Function (FTF) that relies upon the current data symbol and previous hop frequency. This paper proposes a new dynamic FTF technique with wider spreading bandwidth for improved performance against an intelligent eavesdropper while keeping complexity low.
The State and Direction of Asian Comparative Politics: Who, What, Where, How?
Jason P. Abbott,Kevin Fahey 동아시아연구원 2014 Journal of East Asian Studies Vol.14 No.1
In this article we explore the state of the discipline of comparative Asian politics. In particular we analyze five aspects of research on Asia: whether the empirical scope of research is largely noncomparative; the extent to which that research is empirical rather than theory-generative; whether it pertains to public or foreign policy; if it relies on qualitative rather than quantitative methods; and the gender and geographic concentration of those conducting the research. After coding and analyzing data from 461 articles from eight different journals, we demonstrate that research on comparative Asian politics is more likely to be empirical, qualitative, focused on the country as unit of analysis, and disproportionately written by male academics educated and/or working in North America, Western Europe, or Australia.
Warneke, Carsten,Trainer, Michael,de Gouw, Joost A.,Parrish, David D.,Fahey, David W.,Ravishankara, A. R.,Middlebrook, Ann M.,Brock, Charles A.,Roberts, James M.,Brown, Steven S.,Neuman, Jonathan A.,L Copernicus GmbH 2016 Atmospheric measurement techniques Vol.9 No.7
<P><p><strong>Abstract.</strong> Natural emissions of ozone-and-aerosol-precursor gases such as isoprene and monoterpenes are high in the southeastern US. In addition, anthropogenic emissions are significant in the southeastern US and summertime photochemistry is rapid. The NOAA-led SENEX (Southeast Nexus) aircraft campaign was one of the major components of the Southeast Atmosphere Study (SAS) and was focused on studying the interactions between biogenic and anthropogenic emissions to form secondary pollutants. During SENEX, the NOAA WP-3D aircraft conducted 20 research flights between 27 May and 10 July 2013 based out of Smyrna, TN. Here we describe the experimental approach, the science goals and early results of the NOAA SENEX campaign. The aircraft, its capabilities and standard measurements are described. The instrument payload is summarized including detection limits, accuracy, precision and time resolutions for all gas-and-aerosol phase instruments. The inter-comparisons of compounds measured with multiple instruments on the NOAA WP-3D are presented and were all within the stated uncertainties, except two of the three NO<sub>2</sub> measurements. The SENEX flights included day- and nighttime flights in the southeastern US as well as flights over areas with intense shale gas extraction (Marcellus, Fayetteville and Haynesville shale). We present one example flight on 16 June 2013, which was a daytime flight over the Atlanta region, where several crosswind transects of plumes from the city and nearby point sources, such as power plants, paper mills and landfills, were flown. The area around Atlanta has large biogenic isoprene emissions, which provided an excellent case for studying the interactions between biogenic and anthropogenic emissions. In this example flight, chemistry in and outside the Atlanta plumes was observed for several hours after emission. The analysis of this flight showcases the strategies implemented to answer some of the main SENEX science questions.</p> </P>
The Somatic Genomic Landscape of Chromophobe Renal Cell Carcinoma
The Cancer Genome Atlas Research Network,Davis, Caleb F.,Ricketts, C.J.,Wang, M.,Yang, L.,Cherniack, Andrew D.,Shen, H.,Buhay, C.,Kang, H.,Kim, S.,Fahey, Catherine C.,Hacker, Kathryn E.,Bhanot, G.,Gor Cell Press 2014 Cancer Cell Vol.26 No.3
We describe the landscape of somatic genomic alterations of 66 chromophobe renal cell carcinomas (ChRCCs) on the basis of multidimensional and comprehensive characterization, including mtDNA and whole-genome sequencing. The result is consistent that ChRCC originates from the distal nephron compared with other kidney cancers with more proximal origins. Combined mtDNA and gene expression analysis implicates changes in mitochondrial function as a component of the disease biology, while suggesting alternative roles for mtDNA mutations in cancers relying on oxidative phosphorylation. Genomic rearrangements lead to recurrent structural breakpoints within TERT promoter region, which correlates with highly elevated TERT expression and manifestation of kataegis, representing a mechanism of TERT upregulation in cancer distinct from previously observed amplifications and point mutations.