University Library, University of Illinois at Urbana-Champaign

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Diversity, Equity, Inclusion and Accessibility at the University Library
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Showing 801–840 of 54,797 items
  • Modeling and detecting anomalous topic access in EMR audit logs
    Scholarship
    Creator
    Gupta, Siddharth
    Date
    2013
    Description
    Recent use of Electronic Medical Records in the hospitals has raised many privacy concerns regarding confidential patient information which can be accessed by various users in the hospital's complex and dynamic environment. There has been considerable success in developing strategies to detect insider threats in healthcare information systems based on what one might call the random object access model or ROA. This approach models illegitimate users who randomly access records. The goal is to use statistics, machine learning, knowledge of hospital workflows and other techniques to support an anomaly detection framework that finds such users. In this work we introduce and study a random topic access model, RTA, aimed at the users whose access may well be illegitimate but is not fully random because it is focused on common hospital themes. We argue that this model is appropriate for a meaningful range of attacks and develop a system based on topic summarization that is able to formalize the model and provide anomalous user detection for it. We also propose a framework for evaluating the ability to recognize various types of random users called random topic access detection, or RTAD. The proposed RTAD framework is an unsupervised detection model which is a combination of Latent Dirichlet Allocation (LDA), for feature extraction, and a k-nearest neighbor (k-NN) algorithm for outlier detection. The analysis is done on the dataset from Northwestern Memorial Hospital which consists of over 5 million accesses made by 8000 users to 14,000 patients in a four month time period. Our results show varying degrees of success based on user roles and the anticipated characteristics of attackers and evaluate the ability to identify different adversarial types relevant to the hospital ecosystem.
  • The creation of synthetic power grids: preliminary considerations
    Scholarship
    Creator
    Birchfield, Adam B
    Description
    This thesis presents preliminary considerations and an initial methodology for the systematic creation of synthetic power system test cases. The synthesized grids are built to match statistical characteristics found in actual power grids, but they do not correspond to any real grid and are thus free from confidentiality requirements. First, substations are geographically placed on a selected territory, synthesized from public information about the underlying population and generation plants. A clustering technique is employed, which ensures the synthetic substations meet realistic proportions of load and generation, among other constraints. Next, a network of transmission lines is added. This thesis describes several structural statistics to be used in characterizing real power system networks, including connectivity, Delaunay triangulation overlap, dc power flow analysis, and line intersection rate. The thesis presents a methodology to generate synthetic line topologies with realistic parameters which satisfy these criteria. Then, the test cases can be augmented with additional complexities to build large, realistic cases. An application to geomagnetic disturbance analysis is discussed as an example. The thesis illustrates the method with two example test cases, one with 150 buses and the other with 2000 buses. The methodology for creating each is shown, and the characteristics of these cases are validated against the observations from real cases.
  • Why a Women's Center? II
    Scholarship
    Creator
    Ham, Patricia
    Description
    Control of space, particularly at the University of Illinois, influences the movement of the human body and the resources the University provides for the student body. The current Office of Women’s Programs provides a large variety of services to the UIUC student body. However, in order to address all components of women’s needs as well as issues of gender inequity, a Women’s Center is necessary on campus. This study attempts to determine the overall student body awareness of the services provided by the Office of Women’s Programs and the limitations that affect the expansion of the OWP to a Women’s Center. Three interviews with OWP personnel, an observation of the OWP setting, an observation of an OWP event, two campus surveys, and archival research were conducted to obtain the results. An analysis of the data yielded that a lack of physical space, personnel, programming, and resources exists at the OWP. The funding and promotional work for a Women’s Center is deficient on campus. The student body awareness of the OWP is minimal. One of thirty-three undergraduate students had knowledge of the OWP. The expansion of the OWP into a Women’s Center is a powerful step towards offering the UIUC student body a confidential and controlled physical space in an environment where sex as a cultural marker is expanding. This study provides preliminary information on the status quo of the OWP and reasons for expansion, which will contribute to future research on similar topics.
  • Why a Women's Center? III
    Scholarship
    Creator
    Becker, Katherine
    Description
    Control of space, particularly at the University of Illinois, influences the movement of the human body and the resources the University provides for the student body. The current Office of Women’s Programs provides a large variety of services to the UIUC student body. However, in order to address all components of women’s needs as well as issues of gender inequity, a Women’s Center is necessary on campus. This study attempts to determine the overall student body awareness of the services provided by the Office of Women’s Programs and the limitations that affect the expansion of the OWP to a Women’s Center. Three interviews with OWP personnel, an observation of the OWP setting, an observation of an OWP event, two campus surveys, and archival research were conducted to obtain the results. An analysis of the data yielded that a lack of physical space, personnel, programming, and resources exists at the OWP. The funding and promotional work for a Women’s Center is deficient on campus. The student body awareness of the OWP is minimal. One of thirty-three undergraduate students had knowledge of the OWP. The expansion of the OWP into a Women’s Center is a powerful step towards offering the UIUC student body a confidential and controlled physical space in an environment where sex as a cultural marker is expanding. This study provides preliminary information on the status quo of the OWP and reasons for expansion, which will contribute to future research on similar topics.
  • Why a Women's Center? IV
    Scholarship
    Creator
    Wiedemair, Agathe
    Description
    Control of space, particularly at the University of Illinois, influences the movement of the human body and the resources the University provides for the student body. The current Office of Women’s Programs provides a large variety of services to the UIUC student body. However, in order to address all components of women’s needs as well as issues of gender inequity, a Women’s Center is necessary on campus. This study attempts to determine the overall student body awareness of the services provided by the Office of Women’s Programs and the limitations that affect the expansion of the OWP to a Women’s Center. Three interviews with OWP personnel, an observation of the OWP setting, an observation of an OWP event, two campus surveys, and archival research were conducted to obtain the results. An analysis of the data yielded that a lack of physical space, personnel, programming, and resources exists at the OWP. The funding and promotional work for a Women’s Center is deficient on campus. The student body awareness of the OWP is minimal. One of thirty-three undergraduate students had knowledge of the OWP. The expansion of the OWP into a Women’s Center is a powerful step towards offering the UIUC student body a confidential and controlled physical space in an environment where sex as a cultural marker is expanding. This study provides preliminary information on the status quo of the OWP and reasons for expansion, which will contribute to future research on similar topics.
  • Analysis and performance evaluation of coordinated transaction scheduling
    Scholarship
    Creator
    Yurdakul, Ogun
    Description
    In this thesis, we focus on coordinated transaction scheduling (CTS)—an interchange evaluation methodology that is deployed by the New York Independent System Operator (NYISO) and Independent System Operator-New England (ISO-NE) since December 15, 2015. The analysis and the quantification of the performance of any interchange evaluation methodology require the explicit representation of the physical aspects, the economic aspects, the steps of the coordination procedure, and all the interactions among them. In order to consider the required representation and tools in a unified structure, we construct a framework. This framework is general and comprehensive, and can be used as a consistent basis that allows the side-by-side comparison of any two interchange evaluation methodologies. We tailor this framework for CTS, and construct appropriate models of the power system assets and the economics of the two interconnected IGOs, as well as their interactions. We provide an analytical underpinning of the procedural steps of CTS, all the while taking considerable care to maintain the unshared information confidentiality as the private information of each IGO. We perform an assessment of the duration of each procedural step, and identify the binding constraints in the analysis of shorter coordination periods. We use the actual real-time market prices at Sandy Pond and Roseton busses, and evaluate the dependence of the interchange on the coordination period duration. In order to illustrate the execution of the procedural steps of CTS we use various data sets, and we evaluate the interface exchange and the total payments for each data set. We conduct sensitivity analyses, and examine the dependence of the interface exchange and the total payments on a change in the internal offers or the interface offers.