ORCID Profile
0000-0001-5293-6140
Current Organisations
UNSW Sydney
,
The University of Canberra
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Publisher: IEEE
Date: 2009
Publisher: IEEE
Date: 08-01-2023
Publisher: Elsevier BV
Date: 11-2009
Publisher: Elsevier BV
Date: 05-1995
Publisher: Springer International Publishing
Date: 2015
Publisher: ACM
Date: 08-09-2013
Publisher: IEEE
Date: 2019
Publisher: Springer Science and Business Media LLC
Date: 10-08-2016
Publisher: AIP Publishing
Date: 08-01-1999
DOI: 10.1063/1.478145
Abstract: A new effect in doped organic glasses, which we refer to as “energy transfer (ET)-induced spectral diffusion (SD),” ET→SD, has recently been reported by us. In this process “extra” SD, in addition to “normal” SD in glasses, is triggered by the energy balance released on “downhill” ET. Quantitative aspects of the ET→SD process have been investigated by means of time-resolved hole-burning experiments on free-base chlorin (H2Ch) in polystyrene (PS) presented here. The “effective” homogeneous linewidth Γhom′ was determined as a function of delay time td (10−5−103 s), temperature (1.2 to 4.2 K) and concentration (c=1×10−5 to 6×103 M), at various excitation wavelengths within the S1←S0 0-0 band. Γhom′ as a function of temperature was found to obey the relation Γhom′=Γ0′+aT1.3, characteristic for glasses, and we present an analysis of the residual linewidth Γ0′ and the coupling constant a. In this analysis we determined (i) the separate contributions to Γ0′ arising from the fluorescence lifetime, ET, and ET→SD, (ii) the separate contributions to a arising from “pure” dephasing, “normal” SD, and “extra” spectral diffusion caused by ET→SD. The contributions of ET→SD to Γ0′ and a prove to be proportional to the concentration and to the logarithm of the delay time (∝c log td).
Publisher: IEEE
Date: 2012
Publisher: IEEE
Date: 5011
Publisher: ACM
Date: 22-08-2019
Publisher: Springer Science and Business Media LLC
Date: 06-2006
Publisher: IEEE
Date: 07-2006
Publisher: IEEE
Date: 2006
Publisher: Springer International Publishing
Date: 2016
Publisher: IEEE
Date: 11-2017
Publisher: IEEE
Date: 2015
Publisher: IEEE
Date: 11-2018
Publisher: Elsevier BV
Date: 09-2006
DOI: 10.1016/J.IJMEDINF.2006.04.005
Abstract: Today, there are many barriers that prevent seamless electronic voice and data communication with remote content and services that the user wants to access at a certain time and place. This is especially the case in hospitals, where the communication needs are very complex and context dependent, and where strict privacy and safety conditions apply. Personal network (PN) technology is expected to enable the various private networks of a single person to communicate seamlessly with each other, hiding underlying network complexity from the user. We have analyzed the usefulness of PNs in hospitals. We studied the use case of a medical emergency surgery, and built a demonstrator by integrating models of the specialists' personal area networks, home networks, office networks, and a hospital network into a single virtual network. We performed user studies in various hospitals, using a combination of in idual context interviews, scenario and requirements verification, guided experimenting with the demonstrator and concluding workshops. We show that, in case of medical emergencies, PNs can provide a means to enlist remote assistance from peers wherever they are in the world at a particular moment. It can also ease the communication between the operating theatre and the outside world, e.g. for educational purposes.
Publisher: IEEE
Date: 2009
Publisher: IEEE
Date: 2008
DOI: 10.1109/ICC.2008.348
Publisher: IEEE
Date: 2007
Publisher: IEEE
Date: 10-2010
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 05-2004
Publisher: IEEE
Date: 2009
Publisher: Elsevier BV
Date: 12-2013
Publisher: Springer Berlin Heidelberg
Date: 2009
Publisher: Springer London
Date: 2010
Publisher: arXiv
Date: 2022
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 06-2011
Publisher: IEEE
Date: 10-2009
Publisher: IEEE
Date: 09-2008
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 08-2019
Publisher: IEEE
Date: 04-10-2021
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 07-2008
Publisher: Telecommunications Association Inc.
Date: 04-06-2017
Abstract: Given the ever increasing number of Wi-Fi devices in use by the public, the progressing urbanisation, and the current attempts by the industry to improve Wi-Fi system performance, we here analyse the case of apartment blocks with residents increasingly suffering from Wi-Fi over-congestion. Here, in iduals use private Wi-Fi networks in an ''in house'' environment to achieve cordless connectivity to the Internet. We show that Wi-Fi in apartment blocks is a true commons and, therefore, over-congestion can only be avoided by having the in idual access point (AP) operators collaborating with each other. We found that such collaboration is not inhibited by current regulation, but neither can it be enforced. However, as AP operators will most likely enter collaboration voluntarily, further regulation is not deemed necessary.
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 2020
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 2022
Publisher: IEEE
Date: 06-2021
Publisher: IEEE
Date: 2011
Publisher: IEEE
Date: 11-2019
Publisher: MDPI AG
Date: 26-10-2022
DOI: 10.3390/S22218188
Abstract: The basic properties of blockchain, such as decentralization, security, and immutability, show promising potential for IoT applications. The main feature—decentralization of blockchain technology—depends on the consensus. However, consensus algorithms are mostly designed to work in extensive computational and communication environments for network security and immutability, which is not desirable for resource-restricted IoT applications. Many solutions are proposed to address this issue with modified consensus algorithms based on the legacy consensus, such as the PoW, PoS, and BFT, and new non-linear data structures, such as DAG. A systematic classification and analysis of various techniques in the field will be beneficial for both researchers and industrial practitioners. Most existing relevant surveys provide classifications intuitively based on the domain knowledge, which are infeasible to reveal the intrinsic and complicated relationships among the relevant basic concepts and techniques. In this paper, a powerful tool of systematic knowledge classification and explanation is introduced to structure the survey on blockchain consensus algorithms for resource-constrained IoT systems. More specifically, an ontology was developed for a consensus algorithm apropos of IoT adaptability. The developed ontology is sub ided into two parts—CONB and CONIoT—representing the classification of generic consensus algorithms and the ones that are particularly proposed for IoT, respectively. Guided by this ontology, an in depth discussion and analysis are provided on the major consensus algorithms and their IoT compliance based on design and implementation targets. Open research challenges and future research directions are provided.
Publisher: Elsevier BV
Date: 12-1995
Publisher: IEEE
Date: 11-2007
Publisher: IEEE
Date: 2013
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 12-2018
Publisher: MDPI AG
Date: 28-10-2022
DOI: 10.3390/FI14110309
Abstract: We propose a novel vision to trade and allocate wireless spectrum in 6G communication networks inspired by the concept of the sharing economy. We argue that such an approach will help ease the surge in demands for wireless spectrum that will characterise the 6G world. We also introduce HODNET (Heterogeneous on Demand NETwork resource negotiation), an open platform that is able to realise this new spectrum-sharing model. To demonstrate the benefits of spectrum trading and allocation in this new paradigm, we considered the use-case of massive Internet of Things (IoT) on a local scale. We simulated a large IoT deployment and evaluated the spectral efficiency of the system when managed using HODNET compared with a standard 5G deployment. Our experiments show that HODNET can indeed offer better allocation, based on our spectrum sharing model, of spectrum resources compared with standard allocation approaches.
Publisher: IEEE
Date: 08-01-2023
Publisher: Springer Netherlands
Date: 1998
Publisher: IEEE
Date: 2011
Publisher: IEEE
Date: 2007
DOI: 10.1109/CCNC.2007.14
Publisher: IEEE
Date: 12-2020
Publisher: Springer International Publishing
Date: 2018
Publisher: Springer International Publishing
Date: 2016
No related grants have been discovered for Frank den Hartog.