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Agent Tcl: A Flexible And Secure Mobile-Agent System, Robert S. Gray
Agent Tcl: A Flexible And Secure Mobile-Agent System, Robert S. Gray
Dartmouth College Ph.D Dissertations
A mobile agent is an autonomous program that can migrate under its own control from machine to machine in a heterogeneous network. In other words, the program can suspend its execution at an arbitrary point, transport itself to another machine, and then resume execution from the point of suspension. Mobile agents have the potential to provide a {\em single, general framework} in which a wide range of distributed applications can be implemented efficiently and easily. Several challenges must be faced, however, most notably reducing migration overhead, protecting a machine from malicious agents (and an agent from malicious machines), and insulating …
The Complexity Of Clerkship Scheduling, Jonathan Feldman
The Complexity Of Clerkship Scheduling, Jonathan Feldman
Dartmouth College Undergraduate Theses
Medical students must complete a clerkship program in their fourth year. Individual students have preferences for the clerkships to which they are assigned. However, individual hospitals also have capacities on how many students may be assigned to each clerkship. The problem of scheduling medical students to clerkships is formalized. The problem is then placed in a theoretical framework, and the most general case of Clerkship Scheduling is proven NP-hard. A detailed approximation algorithm is given, and an implementation of this algorithm is discussed and tested.
Admission Control Policies For Internet File Transfer Protocols, Simon Holmes A Court
Admission Control Policies For Internet File Transfer Protocols, Simon Holmes A Court
Dartmouth College Undergraduate Theses
Server congestion is a major cause of frustration with the Internet. It is not uncommon for a server with a new release of popular software to be swamped by many times more clients than it can possibly handle. Current Internet file transfer protocols, namely FTP and HTTP, do not have any policy to regulate client admission. In this thesis we are concerned with server admission policies that will improve clients' experience with servers under heavy load. Using a purpose-built network simulator, we compare the prevalent protocols with two new protocols that include policies taken from processor scheduling. By applying more …
An Information Retrieval System For Performing Hierarchical Document Clustering, Eric Hagen
An Information Retrieval System For Performing Hierarchical Document Clustering, Eric Hagen
Dartmouth College Undergraduate Theses
This thesis presents a system for web-based information retrieval that supports precise and informative post-query organization (automated document clustering by topic) to decrease real search time on the part of the user. Most existing Information Retrieval systems depend on the user to perform intelligent, specific queries with Boolean operators in order to minimize the set of returned documents. The user essentially must guess the appropriate keywords before performing the query. Other systems use a vector space model which is more suitable to performing the document similarity operations which permit hierarchical clustering of returned documents by topic. This allows "post query" …
Self-Organizing File Cabinet, Dawn Lawrie
Self-Organizing File Cabinet, Dawn Lawrie
Dartmouth College Undergraduate Theses
This thesis presents a self-organized file cabinet. This file cabinet uses electronic information to augment the physical world. By using a scanner to transform documents into electronic files, the self-organized file cabinet can index the documents on visual and textual information. The self-organized file cabinet helps the user find the documents at a later date. The focus of this thesis is on the design and evaluation of the self-organized file cabinet. User studies show that this tool is natural to use.
Klz: A Prototype X Protocol Compression System, Ka-Tak Lo
Klz: A Prototype X Protocol Compression System, Ka-Tak Lo
Dartmouth College Undergraduate Theses
One of the most commonly used graphics protocol is the X Protocol, enabling programs to display graphics images. When running the X Protocol over the network, a lot of structured data (messages with fields) need to be transmitted. Delays can be detected by human users when connected through a low-bandwidth network. The solution is to compress the X protocol. XRemote, a network version of the X Protocol, uses Dictionary-based compression. In XRemote, strings are recorded in the dictionary. When a string repeats, its index in the dictionary is transmitted. Higher Bandwidth X (HBX) uses statistical modeling techniques instead. A context …