| 1. |
- Floor, P. A., et al.
(författare)
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Transmitting multiple correlated gaussian sources over a Gaussian MAC using delay-free mappings
- 2011
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Ingår i: ISABEL '11 Proceedings of the 4th International Symposium on Applied Sciences in Biomedical and Communication Technologies. - New York, NY, USA : ACM. - 9781450309134
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Konferensbidrag (refereegranskat)abstract
- In this paper, we study the problem of communicating multiple correlated Gaussian memoryless sources over a Gaussian Multiple Access Channel (GMAC). We focus on distributed delay-free, low complexity, joint source-channel coding (JSCC) solutions to the problem. Theoretical performance bounds are derived and linear and nonlinear JSCC schemes are evaluated. The main contribution is a nonlinear hybrid discrete-analog mapping based on distributed quantization and a linear continuous mapping named Distributed Quantizer Linear Coder (DQLC). The proposed scheme shows promising performance which improve with increasing correlation and is robust against variations in noise level.
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| 3. |
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| 4. |
- Favre-Nicolin, V., et al.
(författare)
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Analysis of strain and stacking faults in single nanowires using Bragg coherent diffraction imaging
- 2010
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Ingår i: New Journal of Physics. - : IOP Publishing. - 1367-2630. ; 12
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Tidskriftsartikel (refereegranskat)abstract
- Coherent diffraction imaging (CDI) on Bragg reflections is a promising technique for the study of three-dimensional (3D) composition and strain fields in nanostructures, which can be recovered directly from the coherent diffraction data recorded on single objects. In this paper, we report results obtained for single homogeneous and heterogeneous nanowires with a diameter smaller than 100 nm, for which we used CDI to retrieve information about deformation and faults existing in these wires. We also discuss the influence of stacking faults, which can create artefacts during the reconstruction of the nanowire shape and deformation.
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| 5. |
- Floor, Pal Anders, et al.
(författare)
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Distributed zero-delay joint source-channel coding for a BI-variate Gaussian on a Gaussian MAC
- 2011
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Ingår i: 19TH EUROPEAN SIGNAL PROCESSING CONFERENCE (EUSIPCO-2011). - : EURASIP. ; , s. 2084-2088
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Konferensbidrag (refereegranskat)abstract
- In this paper delay-free distributed joint source-channel coding for communication of two correlated Gaussian sources over a Gaussian Multiple Access Channel (GMAC) are considered. Both discrete and hybrid discrete analog schemes arc proposed and optimized. The proposed schemes are noise robust and show promising performance which improve with increasing correlation.
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| 6. |
- Floor, Pål Anders, et al.
(författare)
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Zero-Delay Joint Source-Channel Coding for a Bivariate Gaussian on a Gaussian MAC
- 2012
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Ingår i: IEEE Transactions on Communications. - 0090-6778 .- 1558-0857. ; 60:10, s. 3091-3102
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Tidskriftsartikel (refereegranskat)abstract
- In this paper, delay-free, low complexity, joint source-channel coding (JSCC) for transmission of two correlated Gaussian memoryless sources over a Gaussian Multiple Access Channel (GMAC) is considered. The main contributions of the paper are two distributed JSCC schemes: one discrete scheme based on nested scalar quantization, and one hybrid discrete-analog scheme based on a scalar quantizer and a linear continuous mapping. The proposed schemes show promising performance which improves with increasing correlation and are robust against variations in noise level. Both schemes also exhibit a constant gap to the performance upper bound when the channel signal-to-noise ratio gets large.
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| 7. |
- Jurgilaitis, Andrius, et al.
(författare)
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Time-Resolved X-ray Diffraction Investigation of the Modified Phonon Dispersion in InSb Nanowires
- 2014
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Ingår i: Nano letters (Print). - Washington, DC : American Chemical Society (ACS). - 1530-6984 .- 1530-6992. ; 14:2, s. 541-546
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Tidskriftsartikel (refereegranskat)abstract
- The modified phonon dispersion is of importance for understanding the origin of the reduced heat conductivity in nanowires. We have measured the phonon dispersion for 50 nm diameter InSb (111) nanowires using time-resolved X-ray diffraction. By comparing the sound speed of the bulk (3880 m/s) and that of a classical thin rod (3600 m/s) to our measurement (2880 m/s), we conclude that the origin of the reduced sound speed and thereby to the reduced heat conductivity is that the C44 elastic constant is reduced by 35% compared to the bulk material. © 2014 American Chemical Society.
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| 8. |
- Lawson, Paul A, et al.
(författare)
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Dysgonomonas hofstadii sp. nov., isolated from a human clinical source.
- 2010
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Ingår i: Anaerobe. - : Elsevier BV. - 1095-8274 .- 1075-9964. ; 16:2, s. 161-4
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Tidskriftsartikel (refereegranskat)abstract
- A Gram-negative staining, facultative anaerobic, cocco-bacillus-shaped organism was isolated from a post-operative abdominal wound. Based on morphological and biochemical criteria, strain MX 1040 (=CCUG 54731(T)) was tentatively identified as Bacteroidaceae but did not correspond to any recognized species of this family. Comparative 16S rRNA gene sequencing analysis demonstrated the organism to be related to species of the genus Dysgonomonas, although sequence divergence values of >5% with the other members of this genus demonstrated the organism to represent a novel species. Phylogenetic analysis revealed the novel organism to be most closely related to Dysgonomonas gadei. The major long-chain cellular fatty acids of the novel species consisted of iso-C(14:0), anteiso-C(15:0), C(16:0), and iso-C(16:0). Based on the phenotypic criteria and phylogenetic considerations, it is proposed that strain MX 1040 from a human clinical source represents a new species of the genus Dysgonomonas, as Dysgonomonas hofstadii sp. nov. The type strain of D. hofstadii is CCUG 54731(T) (=CCM 7606(T)).
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| 9. |
- Riel, Heike, et al.
(författare)
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III-V compound semiconductor transistors-from planar to nanowire structures
- 2014
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Ingår i: MRS Bulletin. - : Springer Science and Business Media LLC. - 1938-1425 .- 0883-7694. ; 39:8, s. 668-677
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Tidskriftsartikel (refereegranskat)abstract
- Conventional silicon transistor scaling is fast approaching its limits. An extension of the logic device roadmap to further improve future performance increases of integrated circuits is required to propel the electronics industry. Attention is turning to III-V compound semiconductors that are well positioned to replace silicon as the base material in logic switching devices. Their outstanding electron transport properties and the possibility to tune heterostructures provide tremendous opportunities to engineer novel nanometer-scale logic transistors. The scaling constraints require an evolution from planar III-V metal oxide semiconductor field-effect transistors (MOSFETs) toward transistor channels with a three-dimensional structure, such as nanowire FETs, to achieve future performance needs for complementary metal oxide semiconductor (CMOS) nodes beyond 10 nm. Further device innovations are required to increase energy efficiency. This could be addressed by tunnel FETs (TFETs), which rely on interband tunneling and thus require advanced III-V heterostructures for optimized performance. This article describes the challenges and recent progress toward the development of III-V MOSFETs and heterostructure TFETs-from planar to nanowire devices-integrated on a silicon platform to make these technologies suitable for future CMOS applications.
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