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Now showing items 11-20 of 97
Pulse-based ultra-wideband transmitters for digital communication
(Massachusetts Institute of Technology, 2007)
Ultra-wideband radio (UWB) is a rapidly developing wireless technology that promises unprecedented data rates for short-range commercial radios, combined with precise locationing and high energy efficiency. These benefits ...
Dynamic rate-control and scheduling algorithms for quality-of-service in wireless networks
(Massachusetts Institute of Technology, 2007)
Rapid growth of the Internet and multimedia applications, combined with an increasingly ubiquitous deployment of wireless systems, has created a huge demand for providing enhanced data services over wireless networks. ...
High-density thermoelectric power generation and nanoscale thermal metrology
(Massachusetts Institute of Technology, 2007)
Thermoelectric power generation has been around for over 50 years but has seen very little large scale implementation due to the inherently low efficiencies and powers available from known materials. Recent material advances ...
Study of cell-cell communication using 3D living cell microarrays
(Massachusetts Institute of Technology, 2007)
Cellular behavior is not dictated solely from within; it is also guided by a myriad of external cues. If cells are removed from their natural environment, apart from the microenvironment and social context they are accustomed ...
Cost-effective optical network architecture : a joint optimization of topology, switching, routing and wavelength assignment
(Massachusetts Institute of Technology, 2007)
To provide end users with economic access to high bandwidth, the architecture of the next generation metropolitan area networks (MANs) needs to be judiciously designed from the cost perspective. In addition to a low initial ...
Robot manipulation in human environments
(Massachusetts Institute of Technology, 2007)
Human environments present special challenges for robot manipulation. They are often dynamic, difficult to predict, and beyond the control of a robot engineer. Fortunately, many characteristics of these settings can be ...
Unsupervised pattern discovery in speech : applications to word acquisition and speaker segmentation
(Massachusetts Institute of Technology, 2007)
We present a novel approach to speech processing based on the principle of pattern discovery. Our work represents a departure from traditional models of speech recognition, where the end goal is to classify speech into ...
Through-substrate interconnects for 3-D integration and RF systems
(Massachusetts Institute of Technology, 2007)
Interconnects on silicon chips are fabricated on the top surface with an ever-increasing number of metal layers necessary to just meet performance needs. While devices have scaled according to Moore's law, interconnects ...
An asynchronous,low-power architecture for interleaved neural stimulation, using envelope and phase information
(Massachusetts Institute of Technology, 2007)
This thesis describes a low-power cochlear-implant processor chip and a charge-balanced stimulation chip that together form a complete processing-and-stimulation cochlear-implant system. The processor chip uses a novel ...
Sensitive manipulation
(Massachusetts Institute of Technology, 2007)
This thesis presents an effective alternative to the traditional approach to robotic manipulation. In our approach, manipulation is mainly guided by tactile feedback as opposed to vision. The motivation comes from the fact ...