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- 저자 : A. Ingram (검색결과 3 건)
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A. Kailas,L. Thanayankizil,M. A. Ingram 한국통신학회 2008 Journal of communications and networks Vol.10 No.2
This paper analyzes a broadcasting technique for wireless multi-hop sensor networks that uses a form of cooperative diversity called opportunistic large arrays (OLAs). We propose a method for autonomous scheduling of the nodes, which limits the nodes that relay and saves as much as 32% of the transmit energy compared to other broadcast approaches, without requiring global positioning system (GPS), individual node addressing, or inter-node interaction. This energy-saving is a result of cross-layer interaction, in the sense that the medium access control (MAC) and routing functions are partially executed in the physical (PHY) layer. Our proposed method is called OLA with a transmission threshold (OLA-T), where a node compares its received power to a threshold to decide if it should forward. We also investigate OLA with variable threshold (OLA-VT), which optimizes the thresholds as a function of level. OLA-T and OLA-VT are compared with OLA broadcasting without a transmission threshold, each in their minimum energy configuration, using an analytical method under the orthogonal and continuum assumptions. The trade-off between the number of OLA levels (or hops) required to achieve successful network broadcast and transmission energy saved is investigated. The results based on the analytical assumptions are confirmed with Monte Carlo simulations.
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Dielectric dispersion studies in (C3N2H5)2SbF5
A. Ingram,Z Czapla,S. Wacke 한국물리학회 2016 Current Applied Physics Vol.16 No.3
The dielectric properties of (C3N2H5)2SbF5 were studied in the frequency range of 40 Hz5 MHz and temperature range 343190 K. There are two dispersion ranges. The first one observed in the range of 10 kHz5 MHz and temperature range 300220 K is connected with dipolar relaxation process. The dispersion observed on the crystal plates normal to the a and c crystallographic axes is quite similar. Activation energies connected with dipolar relaxation for both mentioned directions Ed are equal to 0.335 ± 0.020 eV. The second dispersion observed in the frequency range of 40 Hze10 kHz and temperature interval of 343250 K is supposed to be connected with ionic conductivity. Activation energies for the crystal plates normal to the a and c crystallographic axes are close and equal to Ec ¼ 0.50 ± 0.01 eV and Ec ¼ 0.45 ± 0.01 eV, respectively. The dispersion observed on the crystal plate normal to the b axis in the frequency range of 40 He10 kHz and temperature range of 300343 K is connected with supposed ionic conductivity with an activation energy Ec ¼ 0.75 ± 0.02 eV.
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Chen, Yu-Chih,Baac, Hyoung Won,Lee, Kyu-Tae,Fouladdel, Shamileh,Teichert, Kendall,Ok, Jong G.,Cheng, Yu-Heng,Ingram, Patrick N.,Hart, A. John,Azizi, Ebrahim,Guo, L. Jay,Wicha, Max S.,Yoon, Euisik American Chemical Society 2017 ACS NANO Vol.11 No.5
<P>Considerable evidence suggests that self-renewal and differentiation of cancer stem-like cells, a key cell population in tumorgenesis, can determine the outcome of disease. Though the development of microfluidics has enhanced the study of cellular lineage, it remains challenging to retrieve sister cells separately inside enclosed microfluidics for further analyses. In this work, we developed a photomechanical method to selectively detach and reliably retrieve target cells from enclosed microfluidic chambers. Cells cultured on carbon nanotube polydimethylsiloxane composite surfaces can be detached using shear force induced through irradiation of a nanosecond-pulsed laser. This retrieval process has been verified to preserve cell viability, membrane proteins, and mRNA expression levels. Using the presented method, we have successfully performed 96-plex single-cell transcriptome analysis on sister cells in order to identify the genes altered during self-renewal and differentiation, demonstrating phenomenal resolution in the study of cellular lineage.</P>
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