Efthimis N. Efthimiadis's research while affiliated with University of Washington Seattle and other places

Publications (63)

Article
Full-text available
Objective Clinical documentation is central to the medical record and so to a range of healthcare and business processes. As electronic health record adoption expands, computerized provider documentation (CPD) is increasingly the primary means of capturing clinical documentation. Previous CPD studies have focused on particular stakeholder groups an...
Conference Paper
Cognitive testing of Electronic Health Record (EHR) document presentation and practice will be increasingly valuable as institutions adopt the EHR and begin to experience information overload. Valid testing of clinical decision making requires realistic documents to validly portray clinical scenarios in context. The authors describe a system adapte...
Article
The purpose of this study was to explore the experience of experienced users of computerized patient documentation for the purpose of collaboration and coordination. A secondary analysis of qualitative data using Clark's theoretical framework of communication was conducted with the goal of bringing research findings into design. Physicians, nurses...
Conference Paper
Well-established electronic medical record (EMR) systems accumulate large volumes of documentation (notes, reports and summaries) of highly variable purpose, scope and quality. To assist treatment decisions, caregivers review electronic charts, but do so in a constrained display space. In this study we investigate whether tf·idf, a computable relev...
Book
Information Retrieval has become a very active research field in the 21st century. Many from academia and industry present their innovations in the field in a wide variety of conferences and journals. Companies transfer this new knowledge directly to the general public via services such as web search engines in order to improve their information se...
Chapter
Computerized patient care documentation (CPD) is a vital part of a Patient Care Information System (PCIS). Studying CPD in a well-established PCIS is useful because problems of system adoption and startup do not interfere with observations. Factors interfering with optimal nursing use of CPD areparticularly challenging and of great concern, given t...
Article
Full-text available
Concerns exist about the quality of electronic health care documentation. Prior studies have focused on physicians. This investigation studied document quality perceptions of practitioners (including physicians), nurses and administrative staff. An instrument developed from staff interviews and literature sources was administered to 110 practitione...
Conference Paper
Users on Twitter, a microblogging service, started the phenomenon of adding tags to their messages sometime around February 2008. These tags are distinct from those in other Web 2.0 systems because users are less likely to index messages for later retrieval. We compare tagging patterns in Twitter with those in Delicious to show that tagging behavio...
Conference Paper
Full-text available
The lack of user activity on search results was until recently perceived as a sign of user dissatisfaction from retrieval performance, often, referring to such inactivity as a failed search (negative search abandonment). However, recent studies suggest that some search tasks can be achieved in the contents of the results displayed without the need...
Conference Paper
Simulators are used in research and training because they provide a realistic and safe environment for participants. In the course of conducting a comprehensive study of patient care documentation in electronic medical record (EMR) systems we found that use of a simulated EMR system could address logistic and conceptual barriers encountered in depl...
Conference Paper
We used eye-tracking equipment to observe 36 participants as they performed three search tasks using three graphically-enhanced web search interfaces (Kartoo, SearchMe and Viewzi). In this poster we describe findings of the study focusing on how the presentation of SERP results influences how the user scans and attends to the results, and the user...
Article
Today visual search tools are being used by children in Canada and Mongolia, and college students in the US. These diverse users each have their own needs, expectations, and uses for visual search and the results of such searches. This panel will address issues relating to visual search in diverse environments with various ages of users. The techno...
Article
Full-text available
The study reports on a longitudinal and comparative evaluation of Greek language searching on the web. Ten engines, five global (A9, AltaVista, Google, MSN Search, and Yahoo!) and five Greek (Anazitisi, Ano-Kato, Phantis. Trinity, and Visto), were evaluated using (a) navigational queries in 2004 and 2006; and (b) by measuring the freshness of the s...
Article
Full-text available
With increasingly higher numbers of non-English language web searchers the problems of efficient handling of non-English Web documents and user queries are becoming major issues for search engines. The main aim of this review paper is to make researchers aware of the existing problems in monolingual non-English Web retrieval by providing an overvie...
Article
The study investigates whether legal expertise matters to find more relevant documents during the discovery phase of a request for information.
Article
Full-text available
A literature review of pedagogical methods for teaching and learning information retrieval is presented. From the analysis of the literature a taxonomy was built and it is used to structure the paper. Information Retrieval (IR) is presented from different points of view: technical levels, educational goals, teaching and learning methods, assessment...
Conference Paper
This study investigates how undergraduate and graduate students search the web for consumer health information. The 32 participants were asked to find answers to four health related topics. Data was collected through pre- and post search questionnaires, think-aloud protocol, and transaction logs. The results presented focus on the search process as...
Article
Over 2 billion searches are conducted daily on Web search engines. Some Web searches are re-finding what was seen before, but many searches are query reformulation or refinements as attempts to retrieve better results. Previous studies have examined query formulation and reformulation from the mid-seventies to today, including online intermediary a...
Article
Computerized patient care documentation (CPD) is a vital part of a Patient Care Information System (PCIS). Studying CPD in a well-established PCIS is useful because problems of system adoption and startup do not interfere with observations. Factors interfering with optimal nursing use of CPD are particularly challenging and of great concern, given...
Article
This research investigates the overap in the results found in the three major search engines: Google-Yahoo-MSN Live (GYM). Overlap was measured on per query basis and also by pooling all the indexed URLs retrieved by each engine for all the queries searched. Relevance of returned results was not evaluated. Using a random sample of 65,000 queries fr...
Conference Paper
Users frequently modify a previous search query in hope of retrieving better results. These modifications are called query reformulations or query refinements. Existing research has studied how web search engines can propose reformulations, but has given less attention to how people perform query reformulations. In this paper, we aim to better unde...
Book
Full-text available
The First iNEWS'07 Workshop took place in Amsterdam (The Netherlands) in conjunction with the 30th Annual International ACM SIGIR Conference (SIGIR'07). The workshop aims at bringing together researchers interested in the issues surrounding non-English web searching. Nowadays, over 60% of Internet users are non-English speakers and the number of no...
Article
The explosion of the web has made search an integral part of our daily lives. We search for almost any conceivable topic. Web search engines have made search easily approachable to almost everyone. Yet, for information professionals it is more important than ever before to know “how search works” in order to be more effective in their work. Search...
Article
This project investigated the use of electronic patient documentation in the work context of VA nurses, guided by cognitive work analysis methodology. Prominent themes in nursing workflow and documentation usage identifed in previous research were summarized and presented in detail to a focus group of practicing nurses. The group validated a need f...
Conference Paper
Full-text available
We report results of a pilot study on the use of the Department of Veterans Affairs (VA) computerized patient care documentation system by three stakeholder groups: doctors, nurses, and administrators. The study is informed by the Cognitive Work Analysis methodology. Results identified both benefits of using the system as well as limitations. Based...
Chapter
Full-text available
Search engines have entered popular culture. They touch people in diverse private and public settings and thus heighten the importance of such important social matters as information privacy and control, censorship, and equitable access. To fully benefit from search engines and to participate in debate about their merits, people necessarily appeal...
Conference Paper
The main aim of this short paper is to measure the relevance of the retrieved images in a number of queries in different non-English languages. The reasoning behind retrieval failures is investigated and suggestions for improving these problems are discussed.
Conference Paper
Full-text available
Over 20 billion Web pages from around the world have been indexed by search engines. This study investigates how search engines respond to non-English queries and more specifically to Greek language queries. To address this we conducted an evaluation using Greek queries in ten search engines: five "global" (A9, AltaVista, Google, MSN Search, and Ya...
Conference Paper
This study investigates how Greeks search the web through the analysis of search logs from the AltaVista search engine. The analysis looks at the data as a whole and also examines the use of the Greek language in web searching. Statistics include frequencies of queries, term distributions, languages used including mixed language queries, search fea...
Conference Paper
In strategic management there has been a debate over many years. Already in 1962 Alfred Chandler had stated: Structure follows Strategy. In the nineteen eighties, Michael Porter modified Chandler's dictum about structure following strategy by introducing ...
Conference Paper
The TREC 2007 Legal Track Interactive Task Challenge involved five hypothetical legal “complaints ” based on some facet of tobacco litigation. Each complaint included a request to produce relevant documents. These document production requests were broadly worded to force the opposing party to provide a maximum number of responsive documents during...
Conference Paper
Full-text available
The University of Washington's UWCLMAQA is an open-architecture Question Answering system, built around open source tools unified into one system design using customized enhancements. The goal was to develop an end-to-end QA system that could be easily modified by switching out tools as needed. Central to the system is Lucene, which we use for docu...
Article
The Corporation for Public Broadcasting (CPB) and public broadcasters consider Media Asset Management (MAM) of critical importance since without a concerted and cooperative plan to manage their vast library of content, broadcasters are unable to reach their potential for service in the digital age. The concerns for Media Asset Managmœnt, human and...
Conference Paper
Full-text available
To investigate the nature of people's understandings for how search engines work, we collected data from 232 undergraduate and graduate students. Students were asked to "draw a labeled sketch of how search engines work." A reference model was constructed and each sketch was analyzed and compared against it for completeness. The paper presents preli...
Article
Full-text available
This article summarizes the results of a comparison between the characteristics of two public Web spaces: the pages under the .GR (Greece) domain, and the pages under the .CL (Chile) domain. We show several similarities that contribute to validate more general models for the characteristics of the Web, specially in terms of link structure.
Article
PB Core is the result of the public broadcasting metadata initiative (PBMI). It is an effort of the public radio and television broadcasters to develop a schema for the description of their assets. PBMI is under the auspices of the Corporation for Public Broadcasting. The paper discusses the user-centered development of the schema, the elements of...
Poster
Full-text available
The MARS (Media Asset Retrieval System) Project is the collaborative effort of public broadcasters, libraries and schools in the Puget Sound region to create a digital online resource that provides access to content produced by public broadcasters via the public libraries.
Poster
Full-text available
The MARS (Media Asset Retrieval System) Project is a collaboration between public broadcasters, libraries and schools in the Puget Sound region to assess the needs of their constituents and pool resources to develop solutions to meet those needs. The Projectʼs ultimate goal is to create a digital online resource that will provide access to content...
Conference Paper
The Corporation for Public Broadcasting (CPB) and public broadcasters consider Media Asset Management (MAM) of critical importance since without a concerted and cooperative plan to manage their vast library of content, broadcasters are unable to reach their potential for service in the digital age.The concerns for Media Asset Management, which are...
Article
The Statewide Database Licensing (SDL) Project brought ProQuest, full-text periodicals and newspapers databases from Bell & Howell, to nearly every library in Washington State. The research presented here investigates the impact of statewide database licensing on the users of public, school and community college libraries. The study was conducted i...
Article
A user-centered investigation of interactive query expansion within the context of a relevance feedback system is presented in this article. Data were collected from 25 searches using the INSPEC database. The data collection mechanisms included questionnaires, transaction logs, and relevance evaluations. The results discuss issues that relate to qu...
Article
Introduction This is the first participation of the Graduate School of Library and Information Science, University of California at Los Angeles in the TREC Conference. For TREC--2, Category B, UCLA used a version of the Okapi text retrieval system that was made available to UCLA by CityUniversity, London, UK. OKAPI has been described in TREC1 (Robe...
Article
The last winner of the Salton Award, Tefko Saracevic, gave an acceptance address at SIGIR in Philadelphia in 1997. Previous winners were William Cooper (1994), Cyril Cleverdon (1991), Karen Sparck Jones (1988) and Gerard Salton himself (1985). In this ...
Article
The effect of different types of queries, on the searching behavior, in an image retrieval system was investigated. The research was focused on the technical aspects of image indexing and retrieval, using a variety of algorithms and imaging techniques. Data was collected from 89 searches via questionnaires, and the variables examined were divided i...
Article
The purpose of this study was to evaluate the quality of the medical evidence available to the clinician in the practice of hematology/oncology. We selected 14 neoplastic hematologic disorders and identified 154 clinically important patient management decision/interventions, ranging from initial treatment decisions to those made for the treatment o...
Article
This study examined methods of accessing (for indexing and retrieval purposes) medical research on population groups in the major abstracting and indexing services of the health sciences literature. The study of diseases in specific population groups is facilitated by the indexing of both diseases and populations in a database. The MEDLINE, PsycINF...
Article
The performance of eight ranking algorithms was evaluated with respect to their effectiveness in ranking terms for query expansion. The evaluation was conducted within an investigation of interactive query expansion and relevance feedback in a real operational environment. This study focuses on the identification of algorithms that most effectively...
Article
An intermediary expert system (IES) helps both end users and professional searchers to conduct their online database searching. To provide advice about term selection and query expansion, an IES should include a terminological knowledge structure. Terminological attributes as well as other properties could provide the starting point for building a...
Conference Paper
The evaluation of 6 ranking algorithms for the ranking of terms for query expansion is discussed within the context of an investigation of interactive query expansion and relevance feedback in a real operational environment. The yardstick for the evaluation was provided by the user relevance judgements on the lists of the candidate terms for query...
Article
This review reports on the current state and the potential of tools and systems designed to aid online searching, referred to here as online searching aids. Intermediary mechanisms are examined in terms of the two stage model, i.e. end-user, intermediary, ‘raw database’, and different forms of user — system interaction are discussed. The evolution...
Article
Online Public Access Catalogues (OPACs), despite their recent arrival in the library and information science world, have had a great impact because they have to be designed for the library user. In the few years of their existence the body of literature created cannot be regarded as insignificant. The analysis of the 1970–1985 OPAC literature shows...

Citations

... Image retrieval can indeed be seen as a learning to rank problem [6,9,34,57]. In this framework, the task is to determine in which (partial) order elements from the training set should appear. ...
... Most of the research examining search moves has focused primarily on users seeking textual materials from databases (Bates, 1981;Chapman, 1981;Wildemuth, He, & Friedman 1992;Fidel, 1984, Xie, 2002. Fidel and Efthimiadis (2000) have extended this work by examining the effect of task on image searching behavior in an image database system. Jose, Furner & Harper (1998) have also investigated image retrieval using a simulated work task situation. ...
... To help capture the semantics of the query rather than its bag of words, queries are typically expanded [23,71] to include synonyms and semantically close words. Query expansion based on pre-trained word embeddings expands each query word to its neighbors in the embedding space [21,39,61]. ...
... Past query refinement work has mostly been for typed query applications. Some have focused on refinement clustering and suggestion given a query [3,4], using refinements to segment search sessions [5], and classifying refinements into types (e.g., word reordering, substitution) [6,7]. Other work shows that information-seeking users choose an initial query and then refine it [8], issuing a new query only after several unsuccessful, often non-systematic [9] refinement attempts. ...
... 14,15 In the medical domain, data overload has figured most prominently in the EMRs used by physicians. 4,10,[16][17][18][19] EMR data overload can take on many forms, such as a high density of alerts 18 or simply a large amount of poorly organized, irrelevant medical information. 17,20,21 Data overload has been shown to prevent physicians from quickly and accurately extracting EMR information, which can compromise both efficiency and safety in the hospital. ...
... Following the existing literature, we hypothesized that the models would reflect only a rudimentary understanding of search engines and that participants with greater levels of academic accomplishment in Information Science would produce more nuanced conceptual models with more correct concepts. Preliminary findings of this research were presented in Hendry and Efthimiadis (2004) and Efthimiadis and Hendry (2005). ...
... However, studies [2] demonstrated the inefficiency and verbosity of clinical texts by showing the fact that in 23,630 progress notes written by 460 clinicians, 18% was manually entered, 46% was copied, and 36% was imported. Those poorly organized and redundant texts are the results of the abuse of copy-and-paste, templates, and smart phrases [3]. Besides, erroneous sentences are not uncommon in the freetext EHRs. ...
... Simplified end-user interfaces, such as menu-based BRS/After Dark and Dialog's Knowledge Index, were introduced in the early 1980s (Janke, 1984). At the same time, several front-ends (see Efthimiadis, 1990 for a review of such interfaces) were developed to make online searching more accessible to end-users. Some front-ends offered automatic dial-in and logon facilities, some provided assistance in database selection and others transferred a natural language search request into the language of the database vendor. ...
... The study of query reformulation type has been expanded when Huang and Efthimiadis [25] published an extensive taxonomy consisting of twelve query reformulation types. Previous studies especially in identifying the categories of reformulations have inspired current researchers to explore more techniques in query reformulation field. ...
... Further, The Bulletin of the American Society for Information Science included a series of comprehensive articles on metadata issues in a special section in late 1997. These articles discussed experiments, frameworks, crosswalks with Dublin Core, Uniform Resource Identifiers, and other efforts to explore metadata issues (Efthimiadis and Carlyle, 1997). In the present case, we may be encouraged somewhat by the fact that the semantics of what we hope to be able to say about resources do not appear to be changing significantly. ...