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Kraaij, W. (author), Awad, G. (author), Butt, A.A. (author)[No abstract available]conference paper 2017
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van Lieshout, M.J. (author), Kraaij, W. (author), Molema, H. (author)Many people today use wearable devices and do-it-yourself (diy) tests to monitor their health. While doing so, they generate massive amounts of personal data, such as data about daily activities, heart rate, blood parameters and sleep. Rearch shows that many people are willing to share their data with healthcare providers even app providers when...other 2017
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- van Kraaij, W. (author) public lecture 2017
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Koldijk, S. (author), Kraaij, W. (author), Neerincx, M.A. (author)BACKGROUND: Stress in office environments is a big concern, often leading to burn-out. New technologies are emerging, such as easily available sensors, contextual reasoning, and electronic coaching (e-coaching) apps. In the Smart Reasoning for Well-being at Home and at Work (SWELL) project, we explore the potential of using such new pervasive...article 2016
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Verberne, S. (author), Arends, B. (author), Kraaij, W. (author), de Vries, A. (author)We have collected the access logs for our university's web domain over a time span of 4.5 years. We now release the pre-processed data of a 3-month period for research into user navigation behavior. We preprocessed the data so that only successful GET requests of web pages by non-bot users are kept. The resulting 3-month collection comprises 9...conference paper 2016
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de Boer, M.H.T. (author), Schutte, K. (author), Zhang, H. (author), Lu, Y.J. (author), Ngo, C.W. (author), Kraaij, W. (author)One of the challenges in Multimedia Event Retrieval is the integration of data from multiple modalities. A modality is defined as a single channel of sensory input,such as visual or audio. We also refer to this as data source. Previous research has shown that the integration of different data sources can improve performance compared to only...article 2016
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de Boer, M. (author), Schutte, K. (author), Kraaij, W. (author)A common approach in content based video information retrieval is to perform automatic shot annotation with semantic labels using pre-trained classifiers. The visual vocabulary of state-of-the-art automatic annotation systems is limited to a few thousand concepts, which creates a semantic gap between the semantic labels and the natural language...article 2016
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Sappelli, M. (author), Pasi, G. (author), Verberne, S. (author), de Boer, M. (author), Kraaij, W. (author)In this paper, we analyze corporate e-mail messages as a medium to convey work tasks. Research indicates that categorization of e-mail could alleviate the common problem of information overload. Although e-mail clients provide possibilities of e-mail categorization, not many users spend effort on proper e-mail management. Since e-mail clients...article 2016
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Verberne, S. (author), Sappelli, M. (author), Hiemstra, D. (author), Kraaij, W. (author)We evaluate five term scoring methods for automatic term extraction on four different types of text collections: personal document collections, news articles, scientific articles and medical discharge summaries. Each collection has its own use case: author profiling, boolean query term suggestion, personalized query suggestion and patient query...article 2016
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Sappelli, M. (author), Verberne, S. (author), Kraaij, W. (author)In this article we evaluate context-aware recommendation systems for information re-finding by knowledge workers. We identify 4 criteria that are relevant for evaluating the quality of knowledge worker support: context relevance, document relevance, prediction of user action, and diversity of the suggestions. We compare 3 different context-aware...article 2016
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Koldijk, S. (author), Neerincx, M.A. (author), Kraaij, W. (author)Employees often report the experience of stress at work. In the SWELL project we investigate how new context aware pervasive systems can support knowledge workers to diminish stress. The focus of this paper is on developing automatic classiers to infer working conditions and stress related mental states from a multimodal set of sensor data ...article 2016
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Sappelli, M. (author), Verberne, S. (author), Kraaij, W. (author)In this article, we propose and implement a new model for context recognition and identification. Our work is motivated by the importance of "working in context" for knowledge workers to stay focused and productive. A computer application that can identify the current context in which the knowledge worker is working can (among other things)...article 2016
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Zhang, H. (author), Lu, Y.J. (author), de Boer, M.H.T. (author), ter Haar, F.B. (author), Schutte, K. (author), Kraaij, W. (author), Ngo, C.W. (author)This paper presents an overview and comparative analysis of our systems designed for the TRECVID 2015 [1] multimedia event detection (MED) task. We submitted 17 runs, of which 5 each for the zero-example, 10-example and 100-example subtasks for the Pre-Specified (PS) event detection and 2 runs for the 10-example subtask for the Ad-Hoc (AH) event...conference paper 2015
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Koldijk, S. (author), Bernard, J. (author), Ruppert, T. (author), Kohlhammer, J. (author), Neerincx, M.A. (author), Kraaij, W. (author)Stress in working environments is a recent concern. We see potential in collecting sensor data to detect patterns in work behavior with potential danger to well-being. In this paper, we describe how we applied visual analytics to a work behavior dataset, containing information on facial expressions, postures, computer interactions, physiology...conference paper 2015
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- Over, P. (author), Fiscus, J. (author), Joy, D. (author), Michel, M. (author), Awad, G. (author), Kraaij, W. (author), Smeaton, A.F. (author), Quénot, G. (author), Ordelman, R. (author) conference paper 2015
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Verberne, S. (author), Sappelli, M. (author), Järvelin, K. (author), Kraaij, W. (author)In this paper, we address the question “what is the influence of user search behaviour on the effectiveness of personalized query suggestion?”. We implemented a method for query suggestion that generates candidate follow-up queries from the documents clicked by the user. This is a potentially effective method for query suggestion, but it heavily...conference paper 2015
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de Boer, M.H.T. (author), Brandt, P. (author), Sappelli, M. (author), Daniele, L.M. (author), Schutte, K. (author), Kraaij, W. (author)One of the challenges in the field of content-based image retrieval is to bridge the semantic gap that exists between the information extracted from visual data using classifiers, and the interpretation of this data made by the end users. The semantic gap is a cascade of 1) the transformation of image pixels into labelled objects and 2) the...article 2015
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Ruiter, M. (author), Desain, P. (author), van Heesch, J. (author), van Hengel, J. (author), Kraaij, W. (author), Lindhout, M. (author), Verschaeve, M. (author)In Nederland worden steeds meer apps ontwikkeld die de klinische diagnostiek en behandeling ondersteunen of de functionele communicatievaardigheden van mensen met communicatieve beperkingen beogen te optimaliseren. Apps passen in het huidige, digitale tijdperk, maar apps moeten net als niet-digitale behandelmethoden en ondersteunende...article 2015
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de Boer, M.H.T. (author), Schutte, K. (author), Kraaij, W. (author)A common approach in content based video information retrieval is to perform automatic shot annotation with semantic labels using pre-trained classifiers. The visual vocabulary of state-of-the-art automatic annotation systems is limited to a few thousand concepts, which creates a semantic gap between the semantic labels and the natural language...article 2015
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Zhang, H. (author), Yi-Jie Lu, Y. (author), Boer, M.H.T de (author), ter Haar, F.B. (author), Zhaofan, Q. (author), Schutte, K. (author), Kraaij, W. (author), Ngo, C. (author)This paper presents an overview and comparative analysis of our systems designed for the TRECVID 2015 [1] multimedia event detection (MED) task. We submitted 17 runs, of which 5 each for the zeroexample, 10-example and 100-example subtasks for the Pre-Specified (PS) event detection and 2 runs for the 10-example subtask for the Ad-Hoc (AH) event...conference paper 2015