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Ghiasi, S.K. (author), Dsouza, V.K.P. (author), Langendoen, K.G. (author), Zuniga, Marco (author)In recent years, the number of wireless applications has increased significantly, resulting in the radio bands becoming expensive and prone to interference. There is a new research area aiming at mitigating these issues by creating communication links using ambient light. This area, called passive-VLC, not only exploits the visible light...conference paper 2023
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Ghiasi, S.K. (author), Zuniga, Marco (author), Langendoen, K.G. (author)To take advantage of Visible Light Communication (VLC) for low-power applications, such as IoT tags, researchers have been developing systems to modulate (backscatter) ambient light using LC shutters. Various approaches have been explored for single-pixel transmitters, but without following a principled approach. This has resulted in either...conference paper 2021
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Mulatu, C.A. (author), Crosato, A. (author), Langendoen, Eddy J. (author), Moges, Michael M. (author), McClain, M.E. (author)The Fogera Plain, Ethiopia, is affected by recurrent flooding of the Ribb and Gumara Rivers. A large dam on the Ribb River is under construction for irrigation, but also to reduce flooding. We investigated the effects of the dam on the flood regime of the floodplain wetlands using a combination of hydrodynamic and a rainfall-runoff models....journal article 2021
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Kouvelas, N. (author), Rao, V.S. (author), Venkatesha Prasad, Ranga Rao (author), Tawde, G.C. (author), Langendoen, K.G. (author)Long Range Wide Area Network (LoRaWAN) covers the needs of energy-constrained IoT-devices for operational longevity and extended communication range in a best-effort fashion. However, Lo- RaWAN’s minimalist design cannot handle the traffic from dense deployments with more than a few hundred devices connected to a single gateway, since each LoRa...conference paper 2020
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Majid, A.Y. (author), Schilder, Patrick (author), Langendoen, K.G. (author)The main obstacles to achieve truly ubiquitous sensing are (i) the limitations of battery technology - batteries are short-lived, hazardous, bulky, and costly - and (ii) the unpredictability of ambient power. The latter causes sensors to operate intermittently, violating the availability requirements of many real-world applications. In this...conference paper 2020
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Mulatu, C.A. (author), Crosato, A. (author), Langendoen, Eddy J. (author), Moges, Michael M. (author), McClain, M.E. (author)This work investigates the applicability of an analytical method for quick assessments of the long-term morphological effects of different dam operations on downstream river reaches with the idea to apply the method in feasibility studies to identify the least morphologic-impacting operation scenario. The Ribb River (Ethiopia) is used as a...journal article 2020
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Janssen, S.A.M. (author), Sharpanskykh, Alexei (author), Curran, R. (author), Langendoen, K.G. (author)AATOM, the Agent-based Airport Terminal Operations Model simulator is open-source, agent-based at its core, and contains several calibrated presets and templates of basic airport terminal components that can readily be used. Agents in this simulator follow the AATOM architecture, an activity-based architecture for human airport agents. This...conference paper 2019
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Sarkar, Chayan (author), Venkatesha Prasad, Ranga Rao (author), Langendoen, K.G. (author)With the advent of low-cost, embedded sensor-actuator devices, the applications of cyber-physical systems have spread multi-fold in domains like infrastructure, manufacturing, automation, etc. Wireless sensor-actuator networks (WSANs) act as the backbone for applications in these domains. Typical WSAN deployments focus on energy-efficiency ...journal article 2019
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Turkovic, B. (author), Kuipers, F.A. (author), van Adrichem, Niels (author), Langendoen, K.G. (author)Along with exciting visions for 5G communications and the Tactile Internet, the networking requirement of attaining extremely low end-to-end latency has appeared. While network devices are typically equipped with buffers to counteract packet loss caused by short-lived traffic bursts, the more those buffers get filled, the more delay is added to...conference paper 2018
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Mulatu, C.A. (author), Crosato, A. (author), Moges, Michael M. (author), Langendoen, Eddy J. (author), McClain, Michael (author)The meandering Ribb River flows in northwest Ethiopia to Lake Tana, the source of the Blue Nile River. The river has already undergone changes due to several human interventions, such as embanking, sand mining, water extraction and lake level regulation for hydropower. At present, a dam and a weir are under construction to store and divert...journal article 2018
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Cattani, M. (author), Protonotarios, I. (author), Martella, Claudio (author), van Velzen, Joost (author), Zuniga, Marco (author), Langendoen, K.G. (author)This paper reports our experience with crowd monitoring technologies in the challenging real-world conditions of a modern, open-space museum. We seized the opportunity to use the NEMO science center as a testbed, and studied the effectiveness of neighborhood discovery and density estimation algorithms in a network formed by visitors wearing...conference paper 2017
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Parker, T. (author), Halkes, G. (author), Bezemer, M. (author), Langendoen, K. (author)Most current WSN MAC protocol implementations have multiple tasks to perform—deciding on correct timing, sending of packets, sending of acknowledgements, etc. However, as much of this is common to all MAC protocols, there is duplication of functionality, which leads to larger MAC protocol code size and therefore increasing numbers of bugs....journal article 2010
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Halkes, G.P. (author), Langendoen, K.G. (author)The evaluation ofMAC protocols forWireless Sensor Networks (WSNs) is often performed through simulation. These simulations necessarily abstract away from reality inmany ways. However, the impact of these abstractions on the results of the simulations has received only limited attention. Moreover, many studies on the accuracy of simulation have...journal article 2010
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- Langendoen, K.G. (author) public lecture 2009
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- Haratcherev, L. (author), Taal, J. (author), Langendoen, K. (author), Lagendijk, R. (author), Sips, H. (author) journal article 2006
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- Pouwelse, J. (author), Langendoen, K. (author), Sips, H.J. (author) journal article 2003
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- Langendoen, E.J. (author) doctoral thesis 1992
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Langendoen, E.J. (author), Karelse, M. (author)Detailed measurements are presented of velocity and density fields in the entrance of a model harbor on a stratified tidal river. Three geometries of the harbor entrance were examined, (1) a harbor with its length axis perpendicular to the river and an entrance width of 1 m, (2) as (1) but with an entrance width of 0.5 m, and (3) a harbor with...report 1990
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Langendoen, E.J. (author)The research that has been presented in this report is a part of an ongoing study on the siltation of tidal harbors. The study deals with the water motion in the harbor entrance, which motion causes the siltation. As yet, too little is known about this complicated time-dependent water motion. The data obtained during the research will be used to...report 1990
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Langendoen, E.J. (author)Many harbors in the world suffer from siltation in their basins and in many cases removal of the deposited sediment leads to high costs. This siltation results from a net transport of sediment into the harbor caused by the water motion in the harbor entrance. The water motion is very complex and of a three-dimensional nature. Three main...report 1989