Analyzing Tag Semantics Across Collaborative Tagging Systems

The objective of our group was to exploit state-of-the-art Information Retrieval methods for finding associations and dependencies between tags, capturing and representing differences in tagging behavior and vocabulary of various folksonomies, with the overall aim to better understand the semantics of tags and the tagging process. Therefore we analyze the semantic content of tags in the Flickr and Delicious folksonomies. We find that: tag context similarity leads to meaningful results in Flickr, despite its narrow folksonomy character; the comparison of tags across Flickr and Delicious shows little semantic overlap, being tags in Flickr associated more to visual aspects rather than technological as it seems to be in Delicious; there are regions in the tag-tag space, provided with the cosine similarity metric, that are characterized by high density; the order of tags inside a post has a semantic relevance

Conceptual Structures Tools: Vision and Applications (third Conceptual Structures Tool Interoperability Workshop collocated with the 17h International Conference on Conceptual Structures)

International audienceThe Fourth Conceptual Structures Tool Interoperability Workshop (CS-TIW 2009) was held in Moscow, Russia on the 26th of July 2009, collocated with the 17th International Conference on Conceptual Structures (ICCS 2009) “Leveraging Semantic Technologies”. Information about the workshop is available at the webpage: http://www.kde.cs.uni-kassel.de/ws/cs-tiw2009. The title of this year's workshop, “Vision and Applications” was chosen to emphasize the new challenges, problems and issues that have appeared in the context of knowledge representation that involve the visual manipulation of information by domain experts. Furthermore, such knowledge has to be manipulated with fast results within a logic based framework. In this context conceptual structure tools play a crucial role as their graph based foundations allow for (1) rigorous algorithmic reasoning and (2) user validation for both reasoning and representation. It is a unique environment for integrated research in discrete mathematics, human computer interaction, cognitive science and engineering. The workshop brought together researchers from diverse communities with the common goal of a fruitful discussion on the above mentioned interoperability issues by raising mutual awareness of ongoing research and existing technologies from which each community could benefit. We wish in full to express our appreciation to all the authors of submitted papers and to the members of the Program Committee for all their work and valuable comments

Identification and characterization of patients being exposed to computed-tomography associated radiation-doses above 100 mSv in a real-life setting.

Rationale and objectives: Patients receiving high cumulative effective doses (CED) from recurrent computed tomography (CT) in a real-life setting are not well identified. Evaluation of causes and patient characteristics may help to define individuals potentially at risk of radiation-induced secondary malignancies. Materials and methods: Patients who received a CED > 100 mSv from CT scans during October 2012 and April 2020 at a tertiary university center were identified with the help of a radiological radiation dose monitoring system. The primary disease and referral diagnosis, number of CT exams, time period, age, BMI and gender distribution of the 1000 patients with the highest CED were analysed. Results: 3431 patients had a CED of more than 100 mSv, which corresponded to 2.75% of all patients who received a CT exam. From the 1000 patients with the highest CED, mean number of CT exams per patient was 14.6, mean CED was 257 mSv (SD 98, range 177–1339). Mean age of patients was 63.9 years (SD 10.6), male to female ratio 3:2, and mean BMI 28.7 kg/m2 (SD 5.5). 728 (72.9%) patients had cancer. The leading primary diagnosis was liver cirrhosis in 197 patients and 103 patients had a liver transplantation. In patients with liver cirrhosis, 750 exams were indicated for the follow-up of the disease, 662 for the clarification of an acute clinical condition, and 202 for CT-guided stereotactic radiofrequency ablation. Conclusion: Recurrent CT scans of patients with cancer, liver cirrhosis and liver transplantation may lead to critically high CED