Within the past two decades there has been an increased amount of interest in human-centered information retrieval research beyond the traditional system-focused view embodied by Cranfield- and TREC-style evaluation. From blending search and recommender systems to work on search as learning, the limits of conventional search engines' focus on…

The exponential growth of digital libraries and the proliferation of scholarly content in electronic formats have made data mining and information retrieval essential tools for effectively managing, organizing, and disseminating knowledge. This thesis provides a comprehensive analysis of the advancements and challenges in these fields, with a…

Formative assessments (FA), which can occur in or out of class, are a way for students to demonstrate their understanding of the material, to see progress, and to receive feedback from instructors related to their learning process. Examples of in-class FAs include clicker questions with peer discussion, while homework assignments are an example of…

Due to the large volume and exponential growth of biomedical documents (e.g., books, journal articles), it has become increasingly challenging for biomedical search engines to retrieve relevant documents based on users' search queries. Part of the challenge is the matching mechanism of free-text indexing that performs matching based on…

Online information is not regulated for quality of content or accuracy; therefore, content found online is not always complete, accurate, or unbiased. While media-literacy education exists, educators often only see the final result of students' online research in the form of the assignment or a works cited page. For teachers to address the media…

Current search engines and information retrieval systems have made extraordinary progress towards interpreting and answering well-defined, direct questions. However, they are often unsatisfactory for assisting users with less well-defined information needs that often occur within an academic context. Examining students' search goals and search…

At the intersection of digital identities and new language and social practice online is the concept of searchable talk (ST). ST describes the process of tagging discourse in a social networking service (SNS) with a hashtag (#), allowing it to be searchable by others. Although originating in Twitter, ST has expanded into other SNS, and is used…

The Human Papillomavirus (HPV) can cause some types of cancer and is the most common sexually transmitted infection in the US. Because most people turn to the internet for health information, this study analyzed HPV information found online. A content analysis was conducted on 69 web search results (URLs) from Google, Yahoo, Bing and Ask. The…

Neuroscience can greatly benefit from using novel methods in computer science and informatics, which enable knowledge discovery in unexpected ways. Currently one of the biggest challenges in Neuroscience is to map the functional circuitry of the brain. The applications of this goal range from understanding structural reorganization of neurons to…

Information literacy (IL) is essential to nurses' delivery of quality patient care due to its role in evidence-based practice. Consequently all nursing students must achieve IL competence upon graduation. However, few publications have explored factors that influence IL skills of prelicensure baccalaureate nursing students and even less is known…

This dissertation examines the information practices of individuals identifying as lesbian, gay, bisexual, transgender, and/or queer (LGBTQ+). It responds to two significant problems in current Library and Information Science (LIS) studies examining these populations. First, there exist a paucity of research studying how these individuals act…

The dissertation research explores an approach to automatic concept-based query expansion to improve search engine performance. It uses a network-based approach for identifying the concept represented by the user's query and is founded on the idea that a collection-specific association thesaurus can be used to create a reasonable representation of…

Social bookmarking systems allow people to create pointers to Web resources in a shared, Web-based environment. These services allow users to add free-text labels, or "tags", to their bookmarks as a way to organize resources for later recall. Ease-of-use, low cognitive barriers, and a lack of controlled vocabulary have allowed social…

Ample evidence exists to support the conclusion that enterprise search is failing its users. This failure is costing corporate America billions of dollars every year. Most enterprise search engines are built using web search engines as their foundations. These search engines are optimized for web use and are inadequate when used inside the…

The inverted index is the main data structure used by all the major search engines. Search engines build an inverted index on their collection to speed up query processing. As the size of the web grows, the length of the inverted list structures, which can easily grow to hundreds of MBs or even GBs for common terms (roughly linear in the size of…