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Schelland, M. (author), Huibregtse, J.N. (author), Walraven, M. (author), Bouwman, E.C.J. (author)
Various changes have put the retention of knowledge within Rijkswaterstaat (the executive agency of the Dutch Ministry of Infrastructure) under pressure in the past years. For crucial objects such as the storm surge barriers, a loss of knowledge is not acceptable and is hence addressed in multiple ways. This paper focuses on the context, content...
conference paper 2019
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Matthews, S. (author), Bigaj-van Vliet, A. (author), Walraven, J. (author), Mancini, G. (author), Dieteren, G. (author)
Discussions have been underway in fib (Fédération Internationale du Béton) about advancing the fib Model Code for concrete structures. These include the fib international workshop in The Hague (June 2015), the fib MC2020 Core Group meeting in Madrid (December 2015), and a series of follow-up worldwide consultations on the fib ambition regarding...
article 2018
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Lassing, B.L. (author), van Poorten, P. (author), Walraven, M. (author), van Herk, S. (author), Vonk, B. (author), Windsor, R. (author)
Hydraulic structures like storm surge barriers are essential for water safety / flood protection. Hence it is important to keep them in operation in the most efficient way during its Life Cycle. A peer review is an asset management tool which has been developed within I- STORM (network of professionals on storm surge barriers) based on a tried...
conference paper 2018
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Walraven, J. (author), Bigaj-van Vliet, A.J. (author)
Om richting te geven aan de ontwikkeling van nieuwe internationale normen, zoals de Eurocodes,
article 2016
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Walraven, J. (author), Vrouwenvelder, A.C.W.M. (author)
Tot voor kort leefde Nederland mee met de gevolgen van aardbevingen in de wereld, in de veronderstelling dat dit ver van ons bed was. Door de recente aardschokken in Groningen zijn in ons land andere ideeën ontstaan over de invloed van aardbevingen op de gebouwde omgeving. In dit artikel worden de herkomst en de karakteristieken van de Groninger...
article 2015
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Walraven, F.A. (author), Venemans, P.H.A. (author), in 't Velt, R. (author), Fransen, F. (author)
The network of the future consists of a combination of different access networks, each providing a level of network availability and mobility suited for a wide range of applications. Mobile network developments culminated in work on the E-UTRAN and Evolved Packet Core (EPC) network and can provide mobile broadband access to many citizens....
conference paper 2013
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Dieteren, G.G.A. (author), de Boer, A. (author), Walraven, J. (author)
Het proefbelasten van bruggen is een methode om te bepalen of de constructie de rekenkundige belasting kan dragen. Dit is van belang voor oudere constructies waarvan de draagkracht onbekend is, of die inmiddels aan een grotere belasting worden onderworpen dan waarvoor zij oorspronkelijk zijn ontworpen. Proefbelasten mag echter niet leiden tot...
article 2012
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Walraven, J.C. (author), Bigaj, A.J. (author)
article 2011
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Walraven, J.C. (author), Bigaj-van Vliet, A. (author)
The fib Model Code is a recommendation for the design of reinforced and prestressed concrete which is intended to be a guiding document for future codes. Model Codes have been published before, in 1978 and 1990. The draft for fib Model Code 2010 was published in May 2010. The most important new element in this Model Code is "Time" in the sense...
article 2011
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Stokking, H.M. (author), van Deventer, M.O. (author), Niamut, O.A. (author), Walraven, F.A. (author), Mekuria, R.N. (author), TNO Informatie- en Communicatietechnologie (author)
This paper introduces a novel network-based approach to inter-destination media synchronization. The approach meets the need for synchronization in advanced TV concepts like social TV and offers high scalability, unlike conventional end-point based approaches. The solution for interdestination media synchronization has been standardized in...
conference paper 2010
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van Deventer, M.O. (author), Stokking, H.M. (author), Niamut, O.M. (author), Walraven, F.A. (author), TNO Informatie- en Communicatietechnologie (author)
Inter-Destination Media Synchronization (IDMS) is a set of technologies to synchronize media content at multiple TVs. Social TV is an important application of IDMS. Social TV enables friends to watch a TV program together from different places, while communicating with each other using text, voice and/or video. However, the "watching-apart...
public lecture 2010
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Bigaj, A.J. (author), Walraven, J.C. (author), TNO Bouw en Ondergrond (author)
conference paper 2010
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Ooms, W.S. (author), Walraven, F.A. (author), van der Werff, M.R. (author), TNO Informatie- en Communicatietechnologie (author)
This paper describes issues related to the integration of IMS and DVB-RCS satellite networks. DVB-RCS is studied as an access network variant for IMS in addition to the already known cellular, wireless and cable access networks. Although combining IMS and DVB-RCS seems a practical solution for communication and content delivery several issues...
conference paper 2009
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Stokking, H.M. (author), den Hartog, F.T.H. (author), Walraven, F.A. (author), TNO Informatie- en Communicatietechnologie (author)
The dynamic provisioning of SIP addresses is a challenge when many devices and services are dynamically attached to an IMS network. Manual provisioning is too labor intensive for a telecommunications operator, and it is difficult to do it in a way that allows those devices and services access to all functionality of the IMS architecture. This...
conference paper 2009
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Walraven, P.L. (author), TNO Defensie en Veiligheid (author)
Stiles and Crawford showed over 75 years ago that the sensitivity of the retina varies with the place of entry of the light into the pupil, and thus with the direction of incidence of light upon the retina. The effect is a property of the cones. Rods have a very limited directional sensitivity with a common centre of symmetry with the hotopic SC...
article 2009
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Bigaj-van Vliet, A.J. (author), Walraven, J.C. (author), TNO Bouw en Ondergrond (author)
article 2009
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van Deventer, M.O. (author), Stokking, H.M. (author), Niamut, O.A. (author), Walraven, F.A. (author), Klos, V.B. (author), TNO Informatie- en Communicatietechnologie (author)
Advanced interactive television services, e.g. using IMS-based IPTV technology, enable users to interact with other users within the context of simultaneously consumed content, like broadcast television channels. Differences of content arrival time of 100 ms may already have a perceivable effect on such interaction. Measurements presented in...
conference paper 2008
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Norp, A.H.J. (author), Pals, H. (author), Walraven, F.A. (author), TNO Informatie- en Communicatietechnologie (author)
IMS is gaining momentum in the market. First operators are deploying IMS, while other operators are considering buying IMS. Operators have two approaches for introducing IMS and building an IMS eco-system: • Buying IMS from a large vendor or system integrator. Vendors like Alcatel-Lucent, Ericsson and Nokia-Siemens offer full IMS solutions...
report 2007
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Stokking, H. (author), Walraven, F. (author), Yetao, Zhu (author), den Hartog, F.T.H. (author), TNO Informatie- en Communicatietechnologie (author)
patent 2007
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Fellinger, J.H.H. (author), Stark, J. (author), Walraven, J.C. (author), TNO Bouw en Ondergrond (author)
The fire resistance of hollow core slabs is currently assessed considering flexural failure only. However, fire tests showed that shear or anchorage failure can also govern the load bearing behaviour. As the shear and anchorage capacity of these slabs rely on the tensile strength of the concrete, the load bearing capacity with respect to these...
conference paper 2005
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