Jordi Nelissen

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Guaranteed Frame Rate (GFR) recently approved by the ATM Forum is expected to become an important service category to efficiently support TCP/IP traffic in ATM networks. We first describe the GFR traffic contract in details. We then present different types of switch implementations that have been proposed to support GFR. We analyze the performance of three(More)
The ATM service category UBR is intended for non-real-time applications that do not require guaranteed QoS commitments. With additional, relatively inexpensive control functions such as packet discard schemes, UBR could become a cost-effective alternative for the transmission of data traffic, offering a straightforward and flexible solution as opposed to(More)
DOCUMENT RESUME TM 034 736 Veldkamp, Bernard P.; Ariel, Adelaide Extended Shadow Test Approach for Constrained Adaptive Testing. Research Report. Twente Univ., Enschede (Netherlands). Faculty of Educational Science and Technology. RR-02-07 2002-00-00 30p Faculty of Educational Science and Technology, University of Twente, P.O. Box 217, 7500 AE Enschede, The(More)
In this study, learners worked with a simulation of harmonic oscillation. Two supportive measures were introduced: model progression and assignments. In model progression, the model underlying the simulation is not offered in its full complexity from the start, but variables are gradually introduced. Assignments are small exercises that help the learner to(More)
In this paper we evaluate various aspects of the ABR flow control schemes using three different evaluation techniques: analysis, simulation and experiments. A discrete-time Markov model alows the evaluation of the influence of different system parameters (distance between source and switch, burstiness of CBR/VBR traffic, time in between computation of(More)
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