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Negation recognition in medical narrative reports 总被引：1，自引：0，他引：1
Substantial medical data, such as discharge summaries and operative reports are stored in electronic textual form. Databases
containing free-text clinical narratives reports often need to be retrieved to find relevant information for clinical and
research purposes. The context of negation, a negative finding, is of special importance, since many of the most frequently
described findings are such. When searching free-text narratives for patients with a certain medical condition, if negation
is not taken into account, many of the documents retrieved will be irrelevant. Hence, negation is a major source of poor precision
in medical information retrieval systems. Previous research has shown that negated findings may be difficult to identify if
the words implying negations (negation signals) are more than a few words away from them. We present a new pattern learning
method for automatic identification of negative context in clinical narratives reports. We compare the new algorithm to previous
methods proposed for the same task, and show its advantages: accuracy improvement compared to other machine learning methods,
and much faster than manual knowledge engineering techniques with matching accuracy. The new algorithm can be applied also
to further context identification and information extraction tasks.
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| Lior RokachEmail: |
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John G. Milton Ami E. Radunskaya Arthur H. Lee Lisette G. de Pillis Diana F. Bartlett 《CBE life sciences education》2010,9(3):316-322
The success of interdisciplinary research teams depends largely upon skills related to team performance. We evaluated student and team performance for undergraduate biology and mathematics students who participated in summer research projects conducted in off-campus laboratories. The student teams were composed of a student with a mathematics background and an experimentally oriented biology student. The team mentors typically ranked the students'' performance very good to excellent over a range of attributes that included creativity and ability to conduct independent research. However, the research teams experienced problems meeting prespecified deadlines due to poor time and project management skills. Because time and project management skills can be readily taught and moreover typically reflect good research practices, simple modifications should be made to undergraduate curricula so that the promise of initiatives, such as MATH-BIO 2010, can be implemented. 相似文献
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Arie Perliger Daphna Canetti-Nisim Ami Pedahzur 《School Effectiveness & School Improvement》2013,24(1):119-140
The present study shed light on the continuing debate among students of political socialisation regarding the effects of civic education on the upholding of democratic attitudes. Our major conclusion is that civic education, in and of itself, has only minor effects on democratic attitudes of pupils. Furthermore, among pupils who attended civic education classes, democratic class climate would have a crucial effect on the internalisation of democratic attitudes, and the association between sociodemographic characteristics and democratic attitudes is partially mediated by perception of democratic class climate. The findings offer a model which involves demographics and class climate for predicting the success of civic education in meeting its main goal—the absorption and internalisation of democratic attitudes. Thus, we hope to take the ongoing debate in the field at least one small step forward. 1 相似文献
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Ami T. Dunathan William G. Powers 《Educational technology research and development : ETR & D》1979,27(1):3-8
Will some teachers avoid using instructional media because they fear communicating? This study compared the past and projected future use of media of beginning education majors who differed in the extent to which they expressed “communication apprehension.” Those who expressed high and moderate amounts of fear for such situations as engaging in classroom discussions with peers and initiating or responding to teacher-oriented discussions reported less past use, and projected less future use, of several types of media than did those having less fear. The media unaffected by apprehension level — overhead projections, slides, and filmstrips — appear to require less teacher responsibility for communication and interpretation. The authors suggest that communication apprehension may be decreased, thereby increasing the possibility that such teachers will use instructional media. 相似文献
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Janette Hughes Laura Morrison Ami Mamolo Jennifer Laffier Suzanne de Castell 《British journal of educational technology : journal of the Council for Educational Technology》2019,50(1):309-325
This paper explores how maker pedagogies helped middle school students develop transferable competencies, such as creativity, problem solving, self-directed learning and citizenship skills. We offer an in-depth look at how purposeful or critical making related to bullying awareness can help struggling students develop positive attitudes related to their roles as contributing members of a classroom community of learners. 相似文献
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Automatic attention cueing by perceived changes in gaze direction was studied in 2-year-old children with autism and typically developing (TD) controls using a visual attention cueing paradigm. In Experiments 1 and 2 the cue consisted of an eye movement (Eyes) and a nonbiological movement (SimEyes), respectively. The results suggest that visual attention in children with autism and their TD counterparts is cued by perceived eye movement. Thus, although in naturalistic situations toddlers with autism do not follow the gaze of others, they are sensitive to directional cues inherent in eye movement. Cue-specific differences in performance related to the level of engagement and cue-processing time may suggest reliance on different underlying strategies for gaze processing in autism. 相似文献
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We present a story of a teacher educator’s response to a situation of contingency and describe how her experience enhanced her personal mathematical knowledge and influenced her teaching. In our analysis, we attend to different levels of awareness that support a teacher educator’s work and illuminate the qualities of a teacher educator’s knowledge, in particular, knowledge at the mathematical horizon. 相似文献
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Victor Makarenkov Ido Guy Niva Hazon Tamar Meisels Bracha Shapira Lior Rokach 《Information processing & management》2019,56(5):1880-1893
In the process of online storytelling, individual users create and consume highly diverse content that contains a great deal of implicit beliefs and not plainly expressed narrative. It is hard to manually detect these implicit beliefs, intentions and moral foundations of the writers.We study and investigate two different tasks, each of which reflect the difficulty of detecting an implicit user’s knowledge, intent or belief that may be based on writer’s moral foundation: (1) political perspective detection in news articles (2) identification of informational vs. conversational questions in community question answering (CQA) archives. In both tasks we first describe new interesting annotated datasets and make the datasets publicly available. Second, we compare various classification algorithms, and show the differences in their performance on both tasks. Third, in political perspective detection task we utilize a narrative representation language of local press to identify perspective differences between presumably neutral American and British press. 相似文献