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Full-Text Articles in Physical Sciences and Mathematics
Personal Radio, John C. Artz Jr
Personal Radio, John C. Artz Jr
Dartmouth College Undergraduate Theses
With the development of new technologies that allow the broadcast of digital data over radio signals, there are many possibilities for improving upon the traditional radio station model for content delivery. The idea of Personal Radio is a system that tailors content to meet the needs of each individual. Using Global Positioning System (GPS) technology to play location specific content, the listening history to play content an appropriate number of times, and user feedback to learn personal preferences, the Personal Radio provides the listener with the content that is the most useful/interesting to them. This paper will examine the general …
Registration Of Images With Dissimilar Contrast Using A Hybrid Method Employing Correlation And Mutual Information, Karolyn A. Abram
Registration Of Images With Dissimilar Contrast Using A Hybrid Method Employing Correlation And Mutual Information, Karolyn A. Abram
Dartmouth College Undergraduate Theses
The problem of fitting one image into another is commonly called "registration." Finding the best possible translation and rotation necessary to align two images is one approach to solving this problem. Registration is a crucial component of many remote sensing and medical image interpretation applications. Image alignment techniques aid in volumetric estimations of complicated structures and allow radiologists to accurately identify changes between sequential images. Radiologists require image alignment capabilities to correct for patient motion and/or content displacement between images. Numerous image registration techniques exist for correcting the alignment problems mentioned above. Unfortunately, most of these techniques, such as Correlation, …
An Economic Cpu-Time Market For D'Agents, Ezra E.K. Cooper
An Economic Cpu-Time Market For D'Agents, Ezra E.K. Cooper
Dartmouth College Undergraduate Theses
A usable and efficient resource-management system has been created for use with D'Agents. The software dynamically negotiates a price rate for CPU time, using the competitive bids of mobile agents that offer currency in return for fast computation. The system allows mobile agents to plan their expenditures across many hosts while minimizing the time needed for their tasks. The ability to price CPU time opens the door for service owners to be compensated for the computation consumed by agents and provides an incentive for servers to allow anonymous agents. We discuss the theoretical background which makes a CPU market system …
Depth From Flash, David B. Martin
Depth From Flash, David B. Martin
Dartmouth College Undergraduate Theses
Digital camera technology has recently seen substantial improvements in image quality while lower prices have made it affordable to the average consumer. Camera manufacturers, however, are not taking full advantage of this new medium for image capture. By filtering the already digitized image produced by these cameras through on-board image processing algorithms we can dramatically increase the power of digital cameras. For example, according to experts in the photographic industry, most people simply take bad pictures. Classic examples of this phenomenon are photographs taken indoors with a point-and-shoot style camera using its built-in flash. The subjects of these photographs often …
A Simulation Of Auroral Absorption, Eric Michael Greenberg
A Simulation Of Auroral Absorption, Eric Michael Greenberg
Dartmouth College Undergraduate Theses
HF radio transmissions propagate long distances by reflecting off the ionosphere. At high latitudes radio propagation is strongly affected by the northern lights (aurora borealis), which causes ionization at low altitudes and hence the absorption of radio waves. Models of this process are still in a primitive state. A simulation of radio wave propagation was created in order to test Foppiano and Bradley's empirical model of auroral absorption. The simulation attempts to predict the net absorption of signals at a receiver by simulating a large number of transmitters, even though the exact sources of the signals are unknown. Although the …
An Infrastructure For A Mobile-Agent System That Provides Personalized Services To Mobile Devices, Debbie O. Chyi
An Infrastructure For A Mobile-Agent System That Provides Personalized Services To Mobile Devices, Debbie O. Chyi
Dartmouth College Undergraduate Theses
In this paper, we present the design of a mobile-agent system that provides a mobile user with a personalized information retrieval service and we describe the implementation of the infrastructure for such a system. This "Personal Agent System" gathers information from the Internet and uses context-aware mechanisms to manage the information according to a mobile user's needs and preferences. The user's schedule and location are the context indicators in this system. These indicators are critical in ensuring that users obtain only the information they want, receive information in a form that is most useful for viewing on their mobile device, …