Engineering Commons^™

Titanium Nitride As An Electrode Material For High Charge Density Applications, Mustafa Khan Patan

Theses

Present day neural prostheses require electrodes with high current densities. Traditional electrodes are not capable of delivering such high current densities. Titanium nitride as an electrode material and other techniques like reactive ion etching, platinization of titanium were studied in this thesis towards improving charge density of electrodes.

Titanium nitride (TiN) was sputtered in a custom designed pattern of electrodes with silicon as substrate, at a deposition rate of 2 A /sec. Atomic Force Microscopy (AFM) analysis of TiN film showed a smooth surface for a film thickness of 1 μm. X-Ray Diffraction (XRD) analysis of the film showed the …

Channel-Predictive Link Layer Arq Protocols In Wireless Networks, Huseyin Dogukan Cavdar

Theses

Communication performance over a wireless channel should be considered according to two main parameters: energy and throughput. The reliable data transfer is a key to these goals. The reliable node-to-node data transfer is performed by link layer protocols. One prominent approach is Automatic Repeat Request (ARQ) protocol. The traditional ARQ protocols attempt to recover the erroneously transmitted frames by retransmitting those frames, regardless of the channel state. Since this channel state unaware behaviour may cause unnecessary retransmissions, traditional ARQ protocols are expected to be energy inefficient. Some ideas have been proposed such as stochastic learning automaton based ARQ, and channel …

A Service Provisioning Platform For Beyond 3g - The Telecommunication Service Exchange, Donna Griffin

Theses

From the inception of mobile communications one of the most important factors contributing to its success has been a good understanding of user requirements. In the first generation, mobile networks offered subscribers the freedom to communicate regardless of their locations and the joy of instant access to voice telephony services. This provided a competitive edge over wire line communication networks and resulted in large revenue streams. However over the past decade, mobile network operators have been faced with a number of factors that have incurred significant costs and resulting reduced revenue. These factors include deregulation, increased competition and technological progress …