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Null-broadening in a waveguide
Kim, J. S.,Hodgkiss, W. S.,Kuperman, W. A.,Song, H. C. 韓國海洋大學校 附設 海洋科學技術硏究所 2002 硏究論文集 Vol.11 No.1
Null-broadening, introduced in plane wave beamforming, is extended to an ocean waveguide in the context of matched field processing. The method is based on the minimum variance processor with white noise constraint and the distribution of fictitious sources using the theory of waveguide invariants. The proposed method is demonstrated in simulation as well as with data collected during the SWellEx-96 experiment. As another application, it is shown that the width of a null can be controlled in an adaptive time reversal mirror with a source-receive array. ⓒ 2002 Acoustical Society of America. [DOI: 10.1121/1.1488139] PACS numbers : 43.60.GK, 43.30.Wi, 43.20.Fn[SAC]
Kim, J.S.,Song, H.C.,Kuperman, W.A. 한국해양대학교 해양과학기술연구소 2001 硏究論文集 Vol.10 No.1
The time-reversal mirror uses the received signal from a probe souse to refocus the signal at the probe source location by backpropagating the time-reversed version of the received signal. In this study, an adaptive method is described to steer a null to an arbitrary position in a waveguide while maintaining a distortionless response at the probe source location. As an application, selective focusing in three space is demonstrated. ⓒ2001 Acoustical Society of America. [DOI: 10.1121/1.1358299] PACS numbers: 43.20.Fn, 43.30.Vh [ANN]
High-rate multiuser communications in shallow water.
Song, H C,Kim, J S,Hodgkiss, W S,Kuperman, W A,Stevenson, M American Institute of Physics for the Acoustical S 2010 Journal of the Acoustical Society of America Vol.128 No.5
<P>Passive multiuser communications in shallow water previously was demonstrated in the 3-4 kHz band using a time reversal approach. This paper extends those experimental results in three respects. First, a larger bandwidth at higher frequency (11-19 kHz) is employed allowing for the use of various symbol rates (or bandwidths). Second, two different shaping pulses are examined: a raised cosine filter and LFM (linear frequency modulation) chirp. Third, the adaptive time reversal approach with spatial nulling is applied to suppress the crosstalk among users. It is shown that the use of a larger bandwidth is beneficial along with the time reversal receiver which can handle significant intersymbol interference with minimal computational complexity. In addition, adding each user degrades the performance by about 4 dB for the benefit of linear increase in data rate. It is demonstrated that an aggregate data rate of 60 kbits/s can be achieved with a 7.5 kHz bandwidth (a spectral efficiency of 8 bits/s?z) by three users distributed over 4.2-m depth at a 2.2 km range in shallow water using 16-QAM (quadrature amplitude modulation).</P>
Park, Joo‐,Won,Park, Woo‐,Jae,Kuperman, Yael,Boura‐,Halfon, Sigalit,Pewzner‐,Jung, Yael,Futerman, Anthony H. Wiley Subscription Services, Inc., A Wiley Company 2013 Hepatology Vol.57 No.2
<P><B>Abstract</B></P><P>Sphingolipids are important structural components of cell membranes and act as critical regulators of cell function by modulating intracellular signaling pathways. Specific sphingolipids, such as ceramide, glucosylceramide, and ganglioside GM3, have been implicated in various aspects of insulin resistance, because they have been shown to modify several steps in the insulin signaling pathway, such as phosphorylation of either protein kinase B (Akt) or of the insulin receptor. We now explore the role of the ceramide acyl chain length in insulin signaling by using a ceramide synthase 2 (CerS2) null mouse, which is unable to synthesize very long acyl chain (C22‐C24) ceramides. CerS2 null mice exhibited glucose intolerance despite normal insulin secretion from the pancreas. Both insulin receptor and Akt phosphorylation were abrogated in liver, but not in adipose tissue or in skeletal muscle. The lack of insulin receptor phosphorylation in liver correlated with its inability to translocate into detergent‐resistant membranes (DRMs). Moreover, DRMs in CerS2 null mice displayed properties significantly different from those in wild‐type mice, suggesting that the altered sphingolipid acyl chain length directly affects insulin receptor translocation and subsequent signaling. <I>Conclusion:</I> We conclude that the sphingolipid acyl chain composition of liver regulates insulin signaling by modifying insulin receptor translocation into membrane microdomains. (H<SMALL>EPATOLOGY</SMALL> 2013)</P>
A Puzzling “Switch” in Blood Type Following Blood Transfusion
Luiza Akria,Judith Chezar,Simona Zisman-Rozen,Eyal J. Scheinman,Zeev Zonis,Yoav Hoffmann,Tzipora Falik-Zaccai,Limor Kalfon,Michael Weiss,Andrei Braester,Celia Suriu,Masad Barhoum,Amir Kuperman,Ety Sha 대한진단검사의학회 2017 Annals of Laboratory Medicine Vol.37 No.3
Dear Editor, Here, we describe an unusual case in which blood type was determined following an incompatible blood transfusion, resulting in further incompatible blood product transfusions.