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Articles 1 - 10 of 10
Full-Text Articles in Engineering
Introducing The Newton-Poisson-Brillouin Model In The Quest For Plasmons In Metallic Carbon Nanotubes, Richard P. Zannoni
Introducing The Newton-Poisson-Brillouin Model In The Quest For Plasmons In Metallic Carbon Nanotubes, Richard P. Zannoni
Doctoral Dissertations
A new method is presented to model carbon nanotubes (CNT) of micron length. The Newton-Poisson-Brillouin (NPB) model uses Newtonian physics to model the interaction of a population of thermally excited quasi-particles. The NPB model is self-consistent with Poisson’s equation, and the quasi-particles are confined to the CNT’s band structure. In this work, we explore the parameter space of the model.
Signal Processing In Wireless Communications: Device Fingerprinting And Wide-Band Interference Rejection, Adam C. Polak
Signal Processing In Wireless Communications: Device Fingerprinting And Wide-Band Interference Rejection, Adam C. Polak
Doctoral Dissertations
The rapid progress of wireless communication technologies that has taken place in recent years has significantly improved the quality of everyday life. However with this expansion of wireless communication systems come significant security threats and significant technological challenges, both of which are due to the fact that the communication medium is shared. The ubiquity of open wireless Internet access networks creates a new avenue for cyber-criminals to impersonate and act in an unauthorized way. The increasing number of deployed wide-band wireless communication systems entails technological challenges for effective utilization of the shared medium, which implies the need for advanced interference …
Receiver Design And Security For Low Power Wireless Communications Systems, Kyle A. Morrison
Receiver Design And Security For Low Power Wireless Communications Systems, Kyle A. Morrison
Doctoral Dissertations
This dissertation focuses on two important areas in wireless communications: receiver design and security. In the first part of this dissertation we consider low data rate receiver design for ultra-wideband (UWB), a wideband radio technology that promises to help solve the frequency allocation problem that often inhibits narrowband systems. Reference-based receivers are promising candidates in the UWB regime, because the conventional rake receiver designs suffers from complexity limitations and inaccuracies in channel estimation. Many reference-based systems have arisen as viable solutions for receivers. We unify these systems as well as other systems into the general framework for performance analysis to …
Asymptotic Analysis Of Random Wireless Networks: Broadcasting, Secrecy, And Hybrid Networks, Cagatay Capar
Asymptotic Analysis Of Random Wireless Networks: Broadcasting, Secrecy, And Hybrid Networks, Cagatay Capar
Doctoral Dissertations
This thesis work is concerned with communication in large random wireless ad hoc networks. We mathematically model the wireless network as a collection of randomly located nodes, and explore how its performance scales as the network size increases. In particular, we study three important properties: broadcasting ability, rate of information exchange, and secret communication capability. In addition, we study connectivity properties of large random graphs in a more general context, where the graph does not necessarily represent a wireless communication network. Broadcasting, i.e., delivering a message from a single node to the entire network in a wireless ad hoc network …
Beam Steering Control System For Low-Cost Phased Array Weather Radars: Design And Calibration Techniques, Rafael H. Medina-Sanchez
Beam Steering Control System For Low-Cost Phased Array Weather Radars: Design And Calibration Techniques, Rafael H. Medina-Sanchez
Doctoral Dissertations
Phase array antennas are a promising technology for weather surveillance radars. Their fast beam steering capability offer the potential of improving weather observations and extending warning lead times. However, one major problem associated with this technology is their high acquisition cost to be use in networked radar systems. One promising technology that could have a significant impact in the deployment of future dense networks of short-range X-band weather radars is the ``Phase-Tilt Radar'', a system that uses a one-dimensional phase scanned antenna array mounted over a tilting mechanism. This dissertation addresses some of specific challenges that arise in designing and …
Interpreting, Stephanie Jo Kent
Interpreting, Stephanie Jo Kent
Doctoral Dissertations
What do community interpreting for the Deaf in western societies, conference interpreting for the European Parliament, and language brokering in international management have in common? Academic research and professional training have historically emphasized the linguistic and cognitive challenges of interpreting, neglecting or ignoring the social aspects that structure communication. All forms of interpreting are inherently social; they involve relationships among at least three people and two languages. The contexts explored here, American Sign Language/English interpreting and spoken language interpreting within the European Parliament, show that simultaneous interpreting involves attitudes, norms and values about intercultural communication that overemphasize information and discount …
Parallel Multi-Core Verilog Hdl Simulation, Tariq B. Ahmad
Parallel Multi-Core Verilog Hdl Simulation, Tariq B. Ahmad
Doctoral Dissertations
In the era of multi-core computing, the push for creating true parallel applications that can run on individual CPUs is on the rise. Application of parallel discrete event simulation (PDES) to hardware design verification looks promising, given the complexity of today’s hardware designs. Unfortunately, the challenges imposed by lack of inherent parallelism, suboptimal design partitioning, synchronization and communication overhead, and load balancing, render this approach largely ineffective. This thesis presents three techniques for accelerating simulation at three levels of abstraction namely, RTL, functional gate-level (zero-delay) and gate-level timing. We review contemporary solutions and then propose new ways of speeding up …
Exploiting Energy Harvesting For Passive Embedded Computing Systems, Jeremy Joel Gummeson
Exploiting Energy Harvesting For Passive Embedded Computing Systems, Jeremy Joel Gummeson
Doctoral Dissertations
The key limitation in mobile computing systems is energy - without a stable power supply, these systems cannot process, store, or communicate data. This problem is of particular interest since the storage density of battery technologies do not follow scaling trends similar to Moore's law. This means that depending on application performance requirements and lifetime objectives, a battery may dominate the overall system weight and form factor; this could result in an overall size that is either inconvenient or unacceptable for a particular application. As device features have scaled down in size, entire embedded systems have been implemented on a …
Heat Dissipation Bounds For Nanocomputing: Methodology And Applications, Ilke Ercan
Heat Dissipation Bounds For Nanocomputing: Methodology And Applications, Ilke Ercan
Doctoral Dissertations
Heat dissipation is a critical challenge facing the realization of emerging nanocomputing technologies. There are different components of this dissipation, and a part of it comes from the unavoidable cost of implementing logically irreversible operations. This stems from the fact that information is physical and manipulating it irreversibly requires energy. The unavoidable dissipative cost of losing information irreversibly fixes the fundamental limit on the minimum energy cost for computational strategies that utilize ubiquitous irreversible information processing. A relation between the amount of irreversible information loss in a circuit and the associated energy dissipation was formulated by Landauer's Principle in a …
Intentional And Unintentional Side-Channels In Embedded Systems, Georg Tobias Becker
Intentional And Unintentional Side-Channels In Embedded Systems, Georg Tobias Becker
Doctoral Dissertations
Side-channel attacks have become a very important and well-studied area in computer security. Traditionally, side-channels are unwanted byproducts of implementations that can be exploited by an attacker to reveal secret information. In this thesis, we take a different approach towards side-channels. Instead of exploiting already existing side-channels, they are inserted intentionally into designs. These intentional side-channels have the nice property of being hidden in the noise. Only their implementer can make use of them. This makes them a very interesting building block for different applications, especially since they can also be implemented very efficiently. In this thesis, techniques to build …