- document
- IJsselsteijn, W.A. (author), Freeman, J. (author), De Ridder, H. (author) journal article
- document
-
De Haan, H.J. (author), Hamer, D.G. (author), Kevelham, D.J. (author), Pluijm, M. (author), Poel, S.J. (author), Querido, B. (author), De Ridder, H. (author), Rook, D. (author), Verhagen, H.J. (author)Het kustmorfologisch onderzoek van de varianten moest beperkt blijven door het krappe tijdschema. Er is derhalve selectief gebruik gemaakt van de tegenwoordig beschikbare geavanceerde kustmorfologische rekenmodellen. Voor deze fase waarin de voorgestelde varianten tot een niveau van een studie-ontwerp worden uitgewerkt, wordt dat voldoende...report 1985
- document
- De Ridder, H. (author) public lecture 2001
- document
-
Van Doorn, A.J. (author), De Ridder, H. (author), Koenderink, J.J. (author)Pictorial relief depends strongly on “cues” in the image. For isoluminant renderings some cues are missing, namely all information that is related to luminance contrast (e.g., shading, atmospheric perspective). It has been suggested that spatial discrimination and especially pictorial space suffer badly in isoluminant conditions. We have...conference paper 2005
- document
- Buzink, S.N. (author), Koch, A.D. (author), Heemskerk, J. (author), Botden, S.M.B.I. (author), Goossens, R.H.M. (author), De Ridder, H. (author), Schoon, E.J. (author), Jakimowicz, J.J. (author) journal article 2007
- document
-
Albayrak, A. (author), Van Veelen, M.A. (author), Prins, J.F. (author), Snijders, C.J. (author), De Ridder, H. (author), Kazemier, G. (author)Background: One of the main ergonomic problems during surgical procedures is the surgeon's awkward body posture, often accompanied by repetitive movements of the upper extremities, increased muscle activity, and prolonged static head and back postures. In addition, surgeons perform surgery so concentrated that they tend to neglect their posture....journal article 2007
- document
-
Vastenburg, M.H. (author), Keyson, D.V. (author), De Ridder, H. (author)A field study in ten homes was conducted to understand what influences users’ acceptability of notifications in the home environment. The key finding is that perceived message urgency is the primary indicator of acceptability of notifications in the home—if people think a message is urgent, they want the message to be shown immediately,...journal article 2007
- document
-
De Ridder, H. (author), Rozendaal, M.C. (author)Ubiquitous computing (or Ambient Intelligence) promises a world in which information is available anytime anywhere and with which humans can interact in a natural, multimodal way. In such world, perceptual image quality remains an important criterion since most information will be displayed visually, but other criteria such as enjoyment, fun,...conference paper 2008
- document
-
Rozendaal, M.C. (author), Keyson, D.V. (author), De Ridder, H. (author)A recent focus is on creating engaging user experiences with digital products and services such as voicemail. This study aims to design towards increased levels of engagement in voicemail browsing by using the ‘Richness, Control and Engagement’ (RC & E) framework. This framework explains the levels of engagement in terms of the levels of...journal article 2008
- document
-
Vermeeren, A.P.O.S. (author), Attema, J. (author), Akar, E. (author), De Ridder, H. (author), Van Doorn, A.J. (author), Erburg, Ç. (author), Berkman, A.E. (author), Maguire, M. (author)This study explores issues of consistency and inspectability in usability test data analysis processes and reports. Problem reports resulting from usability tests performed by three professional usability labs in three different countries are compared. Each of the labs conducted a usability test on the same product, applying a test protocol that...journal article 2008
- document
-
Ten Holt, G.A. (author), Arendsen, J. (author), De Ridder, H. (author), Van Doorn, A.J. (author), Reinders, M.J.T. (author), Hendriks, E.A. (author)Current automatic sign language recognition (ASLR) seldom uses perceptual knowledge about the recognition of sign language. Using such knowledge can improve ASLR because it can give an indication which elements or phases of a sign are important for its meaning. Also, the current generation of data-driven ASLR methods has shortcomings which may...conference paper 2009
- document
-
De Ridder, H. (author), De Ridder-Sluiter, J.G. (author), Kluin, P.M. (author), Christiaans, H.H.C.M. (author)Ubiquitous computing (or Ambient Intelligence) is an upcoming technology that is usually associated with futuristic smart environments in which information is available anytime anywhere and with which humans can interact in a natural, multimodal way. However spectacular the corresponding scenarios may be, it is equally challenging to consider...conference paper 2009
- document
-
Van Egmond, R. (author), Lemmens, P. (author), Pappas, T.N. (author), De Ridder, H. (author)In three experiments the perceived roughness of visual and of auditory materials was investigated. In Experiment 1, the roughness of frequency-modulated tones was determined using a paired-comparison paradigm. It was found that using this paradigm similar results in comparison to literature were found. In Experiment 2, the perceived visual...conference paper 2009
- document
-
Vastenburg, M.H. (author), Keyson, D.V. (author), De Ridder, H. (author)Recent field experiments on acceptability of notifications in the home showed that people generally want to be informed of urgent messages as soon as possible, whereas non-urgent messages should not be presented at all. A possible way to improve the acceptability of a notification might be to adjust the presentation mode and the timing of...journal article 2009
- document
-
Buzink, S.N. (author), Botden, S.M.B.I. (author), Heemskerk, J. (author), Goossens, R.H.M. (author), De Ridder, H. (author), Jakimowicz, J.J. (author)Background: It is a tacit assumption that clinically based expertise in laparoscopic tissue manipulation entails skilfulness in angled laparoscope navigation. The main objective of this study was to investigate the relation between these skills. To this end, face and construct validity had to be established for the place arrow (PA) and camera...journal article 2009
- document
-
Albayrak, A. (author), Goossens, R.H.M. (author), Snijders, C.J. (author), de Ridder, H. (author), Kazemier, G (author)The present study is based on previous research on the poor body posture of surgeons and their experienced discomfort during surgical procedures. Since surgeons have head-bent and back-bent posture during open surgical procedures, a chest support is a viable supporting principle. This support is meant to reduce lower back pain by minimising...journal article 2010
- document
-
Meijer, F. (author), Van den Broek, E.L. (author), Schouten, T.E. (author), Damgrave, R.G.J. (author), De Ridder, H. (author)In this paper, we explored the use of low fidelity Synthetic Environments (SE; i.e., a combination of simulation techniques) for product design. We explored the usefulness of low fidelity SE to make design problems explicit. In particular, we were interested in the influence of interactivity on user experience. For this purpose, an industrial...conference paper 2010
- document
-
Buzink, S.N. (author), Goossens, R.H.M. (author), Schoon, E.J. (author), De Ridder, H. (author), Jakimowicz, J.J. (author)Background - Surgical techniques that draw from multiple types of image-based procedures (IBP) are increasing, such as Natural Orifice Transluminal Endoscopic Surgery, fusing laparoscopy and flexible endoscopy. However, little is known about the relation between psychomotor skills for performing different types of IBP. For example, do basic...journal article 2010
- document
-
Van Egmond, R. (author), Pappas, T.N. (author), De Ridder, H. (author)In a previous study we investigated the roughness of real world textures taken from the CUReT database. We showed that people could systematically judge the subjective roughness of these textures. However, we did not determine which objective factors relate to these perceptual judgments of roughness. In the present study we take the first step...conference paper 2010
- document
-
Buzink, S.N. (author), Christie, L.S. (author), Goossens, R.H.M. (author), De Ridder, H. (author), Jakimowicz, J.J. (author)Background - The aim of this study is to investigate the influence of the presence of anatomic landmarks on the performance of angled laparoscope navigation on the SimSurgery SEP simulator. Methods - Twenty-eight experienced laparoscopic surgeons (familiar with 30º angled laparoscope, >100 basic laparoscopic procedures, >5 advanced laparoscopic...journal article 2010