Open Access. Powered by Scholars. Published by Universities.®
Articles 1 - 7 of 7
Full-Text Articles in Engineering
Charging-Induced Asymmetry In Molecular Conductors, Eric Polizzi, S. Datta, A. Ghosh, M. Paullson, F. Zahhid
Charging-Induced Asymmetry In Molecular Conductors, Eric Polizzi, S. Datta, A. Ghosh, M. Paullson, F. Zahhid
Eric Polizzi
We investigate the origin of asymmetry in various measured current-voltage (I-V) characteristics of molecules with no inherent spatial asymmetry, with particular focus on a recent break junction measurement. We argue that such asymmetry arises due to unequal coupling with the contacts and a consequent difference in charging effects, which can only be captured in a self-consistent model for molecular conduction. The direction of the asymmetry depends on the sign of the majority carriers in the molecule. For conduction through highest occupied molecular orbitals (i.e., HOMO or p-type conduction), the current is smaller for positive voltage on the stronger contact, while …
Irregular Repeat-Accumulate Codes For Volume Holographic Memory Systems, Hossein Pishro-Nik, Faramarz Fekri
Irregular Repeat-Accumulate Codes For Volume Holographic Memory Systems, Hossein Pishro-Nik, Faramarz Fekri
Hossein Pishro-Nik
We investigate the application of irregular repeat-accumulate (IRA) codes in volume holographic memory (VHM) systems. We introduce methodologies to design efficient IRA codes. We show that a judiciously designed IRA code for a typical VHM can be as good as the optimized irregular low-density-parity-check codes while having the additional advantage of lower encoding complexity. Moreover, we present a method to reduce the error-floor effect of the IRA codes in the VHM systems. This method explores the structure of the noise pattern in holographic memories. Finally, we explain why IRA codes are good candidates for the VHM systems.
Latching On The Wire And Pipelining In Nanoscale Designs, C. Andras Moritz, Teng Wang
Latching On The Wire And Pipelining In Nanoscale Designs, C. Andras Moritz, Teng Wang
C. Andras Moritz
In contrast to general-purpose programmable fabrics, such as PLAs, we develop nano-fabrics that, while also programmable and hierarchical, are more tuned towards an application domain. Our goal is to achieve denser designs with better fabric utilization and efficient cascading of circuits. We call these designs NASICs: Nanoscale Application-Specific Integrated Circuits. We believe NASICs are a more natural fit to implement microprocessors, out of semiconductor nanowires and crossed carbon nanotubes, than PLA style designs. A key challenge in nanoscale designs in general is to preserve the density advantages of the fabric once topological, interconnect, and faulttolerance constraints are considered. In this …
A Three-Dimensional Quantum Simulation Of Silicon Nanowire Transistors With The Effective Mass Approximation, Eric Polizzi, J. Wang, M. Lundstrom
A Three-Dimensional Quantum Simulation Of Silicon Nanowire Transistors With The Effective Mass Approximation, Eric Polizzi, J. Wang, M. Lundstrom
Eric Polizzi
The silicon nanowire transistor (SNWT) is a promising device structure for future integrated circuits, and simulations will be important for understanding its device physics and assessing its ultimate performance limits. In this work, we present a three-dimensional (3D) quantum mechanical simulation approach to treat various SNWTs within the effective-mass approximation. We begin by assuming ballistic transport, which gives the upper performance limit of the devices. The use of a mode space approach (either coupled or uncoupled) produces high computational efficiency that makes our 3D quantum simulator practical for extensive device simulation and design. Scattering in SNWTs is then treated by …
A Core State-Less Bandwidth Broker Architecture For Scalable Support Of Guaranteed Services, Zh Duan, Zl Zhang, Ywt Hou, Lx Gao
A Core State-Less Bandwidth Broker Architecture For Scalable Support Of Guaranteed Services, Zh Duan, Zl Zhang, Ywt Hou, Lx Gao
Lixin Gao
No abstract provided.
Energy Efficient Broadcast In Wireless Ad Hoc Networks With Hitch-Hiking, M Agarwal, Jh Cho, Lx Gao, J Wu
Energy Efficient Broadcast In Wireless Ad Hoc Networks With Hitch-Hiking, M Agarwal, Jh Cho, Lx Gao, J Wu
Lixin Gao
No abstract provided.
Cost-Based Cache Replacement And Server Selection For Multimedia Proxy Across Wireless Internet, Q Zhang, Z Xiang, Ww Zhu, Lx Gao
Cost-Based Cache Replacement And Server Selection For Multimedia Proxy Across Wireless Internet, Q Zhang, Z Xiang, Ww Zhu, Lx Gao
Lixin Gao
No abstract provided.