Página 6 dos resultados de 2566 itens digitais encontrados em 0.030 segundos

An email spam filtering proxy using secure authentication and micro-bonds

Rideout, Ariel Lauren
Fonte: Massachusetts Institute of Technology Publicador: Massachusetts Institute of Technology
Tipo: Tese de Doutorado Formato: 74 p.; 3274604 bytes; 3277608 bytes; application/pdf; application/pdf
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The Apuma system described in this thesis was designed and implemented as a novel combination of existing technologies in order to give an email user full control over their incoming email. The innate uncertainty of automatic spam detection creates a tension between the desire to filter 100% of spam, and the need to avoid the loss of legitimate mail. Apuma attempts to solve this problem by combining accept-lists with payment systems and content evaluation. Messages from known senders can be exempted from filtering; combined with intelligent automated management of the accept-list this can eliminate the vast majority of false-positives. Remaining mail can thus be subjected to much more rigorous screening. Finally, first time contact and other special cases can be handled with micro-payments or micro-bonds. Apuma includes a plugin interface that allows any financial, proof-of work, or other desired protocol to be integrated into the Apuma filtering framework.; by Ariel Lauren Rideout.; Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2005.; Includes bibliographical references (p. 71-74).

Courseware development for a laboratory class in power electronics

Alvira, Mariano
Fonte: Massachusetts Institute of Technology Publicador: Massachusetts Institute of Technology
Tipo: Tese de Doutorado Formato: 103 leaves; 4675638 bytes; 4679907 bytes; application/pdf; application/pdf
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This thesis introduces a new lab kit that is uniquely suited to teach power electronics: the Power NerdKit. The Power NerdKit is a self-contained prototyping system, which is easily incorporated into other systems such as an electric go-kart. Central to the kit is the card-rack prototyping area, where circuitry on PCB cards can be installed, interconnected, and tested. We present three prototyping PCB cards for use with the kit. Each of the cards has a common interconnection inter- face: up to five high current connections can be made via terminal lugs, and up to 26 low current connections can be made via card-edge connector. The first card provides solderless breadboard for constructing circuits and can connect with other cards through the standard interface. The second card is similar to the first, but is designed for circuits that must be soldered together. The last card, called the TriTotemII, implements three "totem-pole" circuits, which form the foundation of the converter topologies taught in the class. Finally the cards feature a unique method to attach oddly shaped devices using Unplated Through-hole Anchor Points. The lab exercises emphasize design.; (cont.) In Lab 1, the student: learns why switching circuits are useful; learns a few necessary control circuits; and builds a switching audio amplifier. In Lab 2...

Image fusion for a nighttime driving display

Herrington, William Frederick
Fonte: Massachusetts Institute of Technology Publicador: Massachusetts Institute of Technology
Tipo: Tese de Doutorado Formato: 40 leaves; 1554976 bytes; 1556567 bytes; application/pdf; application/pdf
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An investigation into image fusion for a nighttime driving display application was performed. Most of the image fusion techniques being investigated in this application were developed for other purposes. When comparing the images of a typical night driving scene to the images used in medical or satellite image fusion it becomes apparent that most of the techniques developed for other fields would be overkill in a nighttime driving display application. This observation motivated the development of a set of image fusion techniques specifically for the nighttime driving display application using the computationally simple Discrete Haar Wavelet Transform. This thesis presents the techniques that were developed and the details of their implementation.; by William Frederick Herrington, Jr.; Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2005.; Includes bibliographical references (leaves 39-40).

A region-based architecture for service-providing distributed systems

Singh, Neha, S.M. Massachusetts Institute of Technology
Fonte: Massachusetts Institute of Technology Publicador: Massachusetts Institute of Technology
Tipo: Tese de Doutorado Formato: 136 leaves; 7186971 bytes; 7192654 bytes; application/pdf; application/pdf
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A service-providing system consists of hosts that provide services such as data, content, computational and memory resources and data-based services to other entities in the system. Consumers that wish to use services describe their needs with a set of high-level objectives. In this thesis, we address the problem of locating services in a large-scale distributed system using their descriptions, rather than their addresses. We propose a network architecture that is based on the concept of dividing the service-providing hosts into Regions. A Region is a grouping of elements of the network that share a set of common characteristics and policies. Members of a region manage their interactions with other regions and their elements according to some defined rules and policies. Hosts can be divided into regions based on various properties such as their content, their commercial model or their security characteristics to name a few. The service provided by a region is an aggregate of the services provided by all its member hosts. The region-based architecture routes a service request through the network efficiently based on its description and on the advertisements from regions providing services. Division of hosts into a set of independent regions partitions the search space and produces a scalable structure.; (cont.) The architecture also does not impose any rules on the internal organization of regions making the system flexible and dynamic.; by Neha Singh.; Thesis (S.M.)--Massachusetts Institute of Technology...

An example of trust-based marketing and customer advocacy in e-commerce

Zhang, Min, M. Eng. Massachusetts Institute of Technology
Fonte: Massachusetts Institute of Technology Publicador: Massachusetts Institute of Technology
Tipo: Tese de Doutorado Formato: 43 p.
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Professor Glen L. Urban at MIT Sloan advocates a new style of marketing based on trust-building. One way to build this trust is to use an advisor to have a conversation with the customer rather than talking at the customer. The purpose of the Suruga Bank project is to test the effects of an advisor-based system in Japan. A loan advisor for Suruga was built which contains two versions: a female person advisor and a cartoon advisor. Additionally, a loan competitor advisor was built comparing Suruga to other Japanese banks. The purpose of the loan advisor is to measure the effectiveness of advocacy and trust on another country, namely Japan. Now that the implementation of the advisor is almost complete, the project is ready to be moved into the market research phase and the results will be obtained by Fall of 2006. The Suruga project has enlightened me on some of the differences in marketing internationally vs. domestically. Through solving the technical PHP and other web-programming issues during this project, I have also become a much more proficient web programmer. In the future, Dr. Urban hopes to continue the project to study marketing in Japan and perhaps add additional features to the site such as morphing.; by Min Zhang.; Thesis (M. Eng. and S.B.)--Massachusetts Institute of Technology...

A circuit based Evolvable Hardware Architecture

Sanchez, Delano Christopher
Fonte: Massachusetts Institute of Technology Publicador: Massachusetts Institute of Technology
Tipo: Tese de Doutorado Formato: 72 p.
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This thesis presents an Evolvable Hardware Architecture that was developed in the Quantum Nanostructures and Nanofabrication Laboratory. We believe intrinsic evolution is a promising tool that can be used to exploit the physics of complex systems. I present a reconfigurable analog circuit platform that is coupled with a genetic algorithm to evolve circuit functions. The design process is detailed along with the results of three evolved circuits. Our coarse grained analog system parallels other evolvable hardware platforms that have been developed using the same architecture. I place our platform in the context of other efforts in the field and our intentions for future work. The speed and complexity of our board is discussed with areas for future development outlined.; by Delano Christopher Sanchez.; Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2006.; Includes bibliographical references (p. 69-72).

Cost-effective optical network architecture : a joint optimization of topology, switching, routing and wavelength assignment; Joint optimization of topology, switching, routing and wavelength assignment

Guan, Kyle Chi
Fonte: Massachusetts Institute of Technology Publicador: Massachusetts Institute of Technology
Tipo: Tese de Doutorado Formato: 285 p.
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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 capital investment, the ultimate goal is to design networks that exhibit excellent scalability - a decreasing cost-per-node-per-unit-traffic as user number and transaction size increase. As an effort to achieve this goal, in this thesis we search for the scalable network architectures over the solution space that embodies the key aspects of optical networks: fiber connection topology, switching architecture selection and resource dimensioning, routing and wavelength assignment (RWA). Due to the inter-related nature of these design elements, we intended to solve the design problem jointly in the optimization process in order to achieve over-all good performance. To evaluate how the cost drives architectural tradeoffs, an analytical approach is taken in most parts of the thesis by first focusing on networks with symmetric and well defined structures (i.e., regular networks) and symmetric traffic patterns (i.e., all-to-all uniform traffic), which are fair representations that give us suggestions of trends, etc.; (cont.) We starts with a examination of various measures of regular topologies. The average minimum hop distance plays a crucial role in evaluating the efficiency of network architecture. From the perspective of designing optical networks...

Minimally intrusive strategies for fault detection and energy monitoring

Cox, Robert Williams, 1979-
Fonte: Massachusetts Institute of Technology Publicador: Massachusetts Institute of Technology
Tipo: Tese de Doutorado Formato: 215 p.
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This thesis addresses the need for automated monitoring systems that rely on minimally intrusive sensor arrays. The monitoring techniques employed in this thesis require fewer sensors because they take a different approach to the measurement problem. Specifically, these techniques use the power distribution network in the target system as a power source, a sensor array, and a communications channel. In this "multi-use" approach, the only measurement sources are a set of centrally located electrical transducers (i.e. voltage and current sensors) and a set of remotely located sensors that communicate with a central processing unit via power line modems. In general, these systems determine the status of critical loads or systems using only electrical data. Thus, remotely located sensors are only employed in order to gather information that would be difficult, if not impossible, to obtain electrically. Examples of such quantities include air exchange rates and occupancy levels in individual rooms. This thesis describes the development and application of several critical features of the minimally intrusive monitoring systems described above. First, it presents several model-based methods that make it possible to use electrical data to detect faults in certain mechanical systems.; (cont.) In particular...

CafNet : a carry-and-forward delay-tolerant network; Carry-and-forward Network : a carry-and-forward delay-tolerant network

Chen, Kevin W. (Kevin William)
Fonte: Massachusetts Institute of Technology Publicador: Massachusetts Institute of Technology
Tipo: Tese de Doutorado Formato: 65 p.
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In this thesis, I designed and implemented a delay-tolerant network stack that allows applications to send messages to other network nodes when no end-to-end connectivity is present. CafNet, the Carry-and-Forward Network, is a delay-tolerant network stack with a CafNet Transport Layer, a CafNet Network Layer, and one or more Mule Adaptation Layers, corresponding to the traditional transport, network, and link layers. Nodes can connect to other nodes through a variety of link mechanisms, and in some cases, the data itself can be physically carried, such as on a USB key or a PDA. CafNet prioritizes messages such that data with a higher priority is sent during short bursts of connectivity. The stack was tested on embedded PC systems used in cars for the CarTel project to determine its performance.; by Kevin W. Chen.; Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2007.; This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.; Includes bibliographical references (p. 63-65).

Correlation indices : a new access method to exploit correlated attributes

Huo, George (George J.)
Fonte: Massachusetts Institute of Technology Publicador: Massachusetts Institute of Technology
Tipo: Tese de Doutorado Formato: 71 p.
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In relational query processing, one generally chooses between two classes of access paths when performing a predicate lookup for which no clustered index is available. One option is to use an unclustered index. Another is to perform a complete sequential scan of the table. Online analytical processing (OLAP) workloads often do not benefit from the availability of unclustered indices; the cost of random disk I/O becomes prohibitive for all but the most selective queries. Unfortunately, this means that data warehouses and other OLAP systems frequently perform sequential scans, unless they can satisfy nearly all of the queries posed to them by a single clustered index [7], or unless they have available specialized data structures - like bitmap indices, materialized views, or cubes - to answer queries directly. This thesis presents a new index data structure called a correlation index (CI) that enables OLAP databases to answer a wider range of queries from a single clustered index or sorted file. The CI exploits correlations between the key attribute of a clustered index and other unclustered attributes in the table. In order to predict when CIs will exhibit wins over alternative access methods, the thesis describes an analytical cost model that is suitable for integration with existing query optimizers. An implementation compares CI performance against sequential scans and unclustered B+Tree indices in the popular Berkeley DB [22] library. Experimental results over three different data sets validate the accuracy of the cost model and establish numerous cases where CIs accelerate lookup times by 5 to 20 times over both unclustered B+Trees and sequential scans. The strong experimental results suggest that CIs offer practical and substantial benefits in a variety of useful query scenarios.; by George Huo.; Thesis (M. Eng.)--Massachusetts Institute of Technology...

NetScratch : a networked programming environment for children; Networked programming environment for children

Stern, Tamara I. (Tamara Ina)
Fonte: Massachusetts Institute of Technology Publicador: Massachusetts Institute of Technology
Tipo: Tese de Doutorado Formato: 64 leaves
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This thesis introduces NetScratch, a programming environment that enables children to make dynamic digital creations that interact across networks. The work is developed as an extension to Scratch, a multi-media programming environment designed for children to create interactive animations, art, games, and other dynamic creations. Particularly, NetScratch adds websensors, a tool to bring information from the web into a Scratch project, and shareable, a way to share information among projects. These features provide children with the tools to create their own web mashups, experiment with real-time changing data, and connect projects to each other. Using NetScratch, children can create personally meaningful networked projects, while learning important computational and design concepts. And, in designing these creations, children can think about how they want to interact across networks and how their creations affect their friends and communities.; by Tamara I. Stern.; Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2007.; Includes bibliographical references (leaves 63-64).

Comparison of data-driven analysis methods for identification of functional connectivity in fMRI

Kim, Yongwook Bryce
Fonte: Massachusetts Institute of Technology Publicador: Massachusetts Institute of Technology
Tipo: Tese de Doutorado Formato: 103 p.
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Data-driven analysis methods, such as independent component analysis (ICA) and clustering, have found a fruitful application in the analysis of functional magnetic resonance imaging (fMRI) data for identifying functionally connected brain networks. Unlike the traditional regression-based hypothesis-driven analysis methods, the principal advantage of data-driven methods is their applicability to experimental paradigms in the absence of a priori model of brain activity. Although ICA and clustering rely on very different assumptions on the underlying distributions, they produce surprisingly similar results for signals with large variation. The main goal of this thesis is to understand the factors that contribute to the differences in the identification of functional connectivity based on ICA and a more general version of clustering, Gaussian mixture model (GMM), and their relations. We provide a detailed empirical comparison of ICA and clustering based on GMM. We introduce a component-wise matching and comparison scheme of resulting ICA and GMM components based on their correlations. We apply this scheme to the synthetic fMRI data and investigate the influence of noise and length of time course on the performance of ICA and GMM, comparing with ground truth and with each other. For the real fMRI data...

Scheduling algorithms for throughput maximization in data networks

Brzezinski, Andrew
Fonte: Massachusetts Institute of Technology Publicador: Massachusetts Institute of Technology
Tipo: Tese de Doutorado Formato: 226 p.
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This thesis considers the performance implications of throughput optimal scheduling in physically and computationally constrained data networks. We study optical networks, packet switches, and wireless networks, each of which has an assortment of features and constraints that challenge the design decisions of network architects. In this work, each of these network settings are subsumed under a canonical model and scheduling framework. Tools of queueing analysis are used to evaluate network throughput properties, and demonstrate throughput optimality of scheduling and routing algorithms under stochastic traffic. Techniques of graph theory are used to study network topologies having desirable throughput properties. Combinatorial algorithms are proposed for efficient resource allocation. In the optical network setting, the key enabling technology is wavelength division multiplexing (WDM), which allows each optical fiber link to simultaneously carry a large number of independent data streams at high rate. To take advantage of this high data processing potential, engineers and physicists have developed numerous technologies, including wavelength converters, optical switches, and tunable transceivers.; (cont.) While the functionality provided by these devices is of great importance in capitalizing upon the WDM resources...

Games, puzzles, and computation

Hearn, Robert A. (Robert Aubrey), 1965-
Fonte: Massachusetts Institute of Technology Publicador: Massachusetts Institute of Technology
Tipo: Tese de Doutorado Formato: 153 leaves
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There is a fundamental connection between the notions of game and of computation. At its most basic level, this is implied by any game complexity result, but the connection is deeper than this. One example is the concept of alternating nondeterminism, which is intimately connected with two-player games. In the first half of this thesis, I develop the idea of game as computation to a greater degree than has been done previously. I present a general family of games, called Constraint Logic, which is both mathematically simple and ideally suited for reductions to many actual board games. A deterministic version of Constraint Logic corresponds to a novel kind of logic circuit which is monotone and reversible. At the other end of the spectrum, I show that a multiplayer version of Constraint Logic is undecidable. That there are undecidable games using finite physical resources is philosophically important, and raises issues related to the Church-Turing thesis. In the second half of this thesis, I apply the Constraint Logic formalism to many actual games and puzzles, providing new hardness proofs. These applications include sliding-block puzzles, sliding-coin puzzles, plank puzzles, hinged polygon dissections, Amazons, Kohane, Cross Purposes...

Comparative modeling of mainly-beta proteins by profile wrapping

Palmer, Nathan Patrick
Fonte: Massachusetts Institute of Technology Publicador: Massachusetts Institute of Technology
Tipo: Tese de Doutorado Formato: 67 p.
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The ability to predict structure from sequence is particularly important for toxins, virulence factors, allergens, cytokines, and other proteins of public heath importance. Many such functions are represented in the parallel [beta]-helix fold class. Structure prediction for this fold is a challenging computational problem because there exists very little sequence similarity (less than 15%) across the SCOP family. This thesis introduces BetaWrapPro, a program for comparative modeling of the parallel -helix fold. By estimating pairwise [beta]-strand interaction probabilities, a profile of the target sequence is aligned, or "wrapped," onto al abstract supersecondary structural template. This wrapping procedure may capture folding processes that have al initiation stage' followed by processive, interaction between the unfolded region and the already-formed substructure. This wrap is then placed on a known structure and side-chains are modeled to produce a three-dimensional structure prediction. We demonstrate that wrapping onto an abstract template produces accurate structure predictions for this fold (ill cross-validation: average C0 RMSD of 1.55 A in accurately wrapped regions, with 88% of the residues accurately aligned). In addition...

On sounding in wideband channels

Jing, Sheng, Ph. D. Massachusetts Institute of Technology
Fonte: Massachusetts Institute of Technology Publicador: Massachusetts Institute of Technology
Tipo: Tese de Doutorado Formato: 76 leaves
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(cont.) This approach provides us with a cohesive framework to consider the relative costs and benefits of allotting energy for sounding versus transmission, and for repeated sounding of a single channel versus sounding of various different channels. In particular, we are able to give both an upper bound and a lower bound on the number of subchannels that should be probed for capacity maximization in terms of the available transmission energy, the available bandwidth and the fading characteristics of the channel. Moreover, the two bounds are so close to each other that they may well be treated as an approximation to the desirable number of subchannels to probe.; For an average-power-constrained wideband fading channel, on the one hand, if the transmitter has perfect knowledge of the fading state over the entire spectrum, the maximum achievable rate (Capacity) is infinite; on the other hand, if the transmitter has no knowledge of the channel's fading state, the capacity is finite. Therefore, the transmitter's knowledge of channel fading states has a great impact on the channel capacity. However, in the low SNR scenario, the energy per degree of freedom does not suffice to provide an accurate measurement of the channel over the entire spectrum in wideband channels. In the presence of feedback...

Passive millimeter-wave retrieval of global precipitation utilizing satellites and a numerical weather prediction model

Surussavadee, Chinnawat
Fonte: Massachusetts Institute of Technology Publicador: Massachusetts Institute of Technology
Tipo: Tese de Doutorado Formato: 234 p.
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This thesis develops and validates the MM5/TBSCAT/F([lambda]) model, composed of a mesoscale numerical weather prediction (NWP) model (MM5), a two-stream radiative transfer model (TBSCAT), and electromagnetic models for icy hydrometeors (F([lambda])), to be used as a global precipitation ground-truth for evaluating alternative millimeter-wave satellite designs and for developing methods for millimeter-wave precipitation retrieval and assimilation. The model's predicted millimeter-wave atmospheric radiances were found to statistically agree with those observed by satellite instruments [Advanced Microwave Sounding Unit-A/B (AMSU-A/B)] on the United States National Ocean and Atmospheric Administration NOAA-15, -16, and -17 satellites over 122 global representative storms. Whereas such radiance agreement was found to be sensitive to assumptions in MM5 and the radiative transfer model, precipitation retrieval accuracies predicted using the MM5/TBSCAT/F([lambda]) model were found to be robust to the assumptions.; (cont.) Appropriate specifications for geostationary microwave sounders and their precipitation retrieval accuracies were studied. It was found that a 1.2-m micro-scanned filled-aperture antenna operating at 118/166/183/380/425 GHz...

Lower bounds for embedding the Earth Mover Distance metric into normed spaces

Samuel, Javed K. K
Fonte: Massachusetts Institute of Technology Publicador: Massachusetts Institute of Technology
Tipo: Tese de Doutorado Formato: 73 p.; 1891353 bytes; 1894338 bytes; application/pdf; application/pdf
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This thesis presents a lower bounds for embedding the Earth Mover Distance (EMID) metric into normed spaces. The EMID is a metric over two distributions where one is a mass of earth spread out in space and the other is a collection of holes in that same space. The EMD between these two distributions is defined as the least amount of work needed to fill the holes with earth. The EMD metric is used in a number of applications, for example in similarity searching and for image retrieval. We present a simple construction of point sets in the ENID metric space over two dimensions that cannot be embedded from the ED metric exactly into normed spaces, namely l1 and the square of l2. An embedding is a mapping f : X --> V with X a set of points in a metric space and ' Va set of points in some normed vector space. When the Manhattan distance is used as the underlying metric for the EMD, it can be shown that this example is isometric to K2,4 which has distortion equal to 1.25 when it is embedded into I and( 1.1180 when embedded into the square of 12. Other constructions of points sets in the EMID metric space over three and higher dimensisions are also discussed..; by Javed K.K. Samuel.; Thesis (M. Eng.)--Massachusetts Institute of Technology...

Non-invasive wearable sensing systems for continuous health monitoring and long-term behavior modeling

Sung, Michael, 1975-
Fonte: Massachusetts Institute of Technology Publicador: Massachusetts Institute of Technology
Tipo: Tese de Doutorado Formato: 228 leaves
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Deploying new healthcare technologies for proactive health and elder care will become a major priority over the next decade, as medical care systems worldwide become strained by the aging populations. This thesis presents LiveNet, a distributed mobile system based on low-cost commodity hardware that can be deployed for a variety of healthcare applications. LiveNet embodies a flexible infrastructure platform intended for long-term ambulatory health monitoring with real-time data streaming and context classification capabilities. Using LiveNet, we are able to continuously monitor a wide range of physiological signals together with the user's activity and context, to develop a personalized, data-rich health profile of a user over time. Most clinical sensing technologies that exist have focused on accuracy and reliability, at the expense of cost-effectiveness, burden on the patient, and portability. Future proactive health technologies, on the other hand, must be affordable, unobtrusive, and non-invasive if the general population is going to adopt them.; (cont.) In this thesis, we focus on the potential of using features derived from minimally invasive physiological and contextual sensors such as motion, speech, heart rate, skin conductance...

SloanSpace- DSpace file transfer component

Cuevas, Genevieve T
Fonte: Massachusetts Institute of Technology Publicador: Massachusetts Institute of Technology
Tipo: Tese de Doutorado Formato: 103 leaves; 4903406 bytes; 4908912 bytes; application/pdf; application/pdf
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This thesis demonstrates how to use Web services to integrate course management systems with digital repositories. We present a component that provides interoperation between SloanSpace, a course management system, and DSpace, a digital repository, both developed at MIT. In particular, a file transfer component was created that enables SloanSpace users to search and retrieve DSpace documents while in SloanSpace, and submit SloanSpace documents into DSpace. DSpace's web services provided the means for interaction between the systems. The architecture of the component was designed to handle not only the metadata mappings between SloanSpace and DSpace metadata, but mappings between file metadata of SloanSpace and other systems as well. Two scenarios were then created to test the effectiveness of the component. The test results demonstrate the ability of the component to decrease the amount of time spent in performing file transfers between the two systems. Most importantly, however, the component demonstrates more generally interoperation with digital repositories. It not only integrates SloanSpace with DSpace, but also allows for a more a general integration with any other system.; by Genevieve T. Curvas.; Thesis (M. Eng.)--Massachusetts Institute of Technology...